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accelerator

A substance used less to increase the reaction rate

This entry is made by Compilation and application of scientific encyclopedia entries of "Science Popularization China" to examine.

Accelerator 'promoter And catalyzer Or fixatives, which can increase the reaction rate in a small amount.

Chinese name: accelerator
Foreign name: accelerator’promoter
Interpretation: Less material used to increase the reaction rate
Appearance: White powder
Classification: 7 categories
Ignition point: It can be ignited with open flame at normal temperature
Storage: It shall be stored indoors, dry and ventilated, high temperature proof and fireproof, and the storage period shall be half a year. If the storage period is exceeded, the qualified ones can still be used

Nature of business: It is sublimated when heated to 200 ℃. It can be ignited with open flame at normal temperature and is insoluble in ether Aromatic hydrocarbon etc.
Purpose: Among radial tires, one is used as reinforcing resin curing agent , improve Rubber products Hardness; The other is resorcinol, etc auxiliary To form a bonding system fibre Adhesion plays an important role
Packaging: Packed in woven bags lined with plastic bags, each bag has a net weight of 20kg

catalog

classification

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The variety of accelerators is complex, and it is difficult to classify them uniformly. This paper classifies them according to the accelerators applicable to various adhesives.

(1) Accelerator for epoxy resin

a， Fatty amine accelerator: DMP-30, EP-184, triethanolamine, etc

b， Acid anhydride Accelerator: BDMA, CT-152x, DBU, etc

c， Polyether amine catalyst: EP-184399, etc

d， Latent catalyst: K-61B, CT-152X, etc

(2) Accelerator for polyurethane adhesive

a， Amine accelerator: triethylenediamine, A-1, A-33, DC-829, etc

b， Tin accelerators: dibutyltin dilaurate, stannous octanoate, CT-E229, etc

⑶ Promoter for phenolic resin adhesive (stannous chloride, ferric chloride, p-chlorobenzoic acid, accelerator M).

⑷ Promoters for unsaturated polyester resin adhesive (cobalt naphthenate, cobalt isooctanoate, zinc isooctanoate, N, N-dimethylaniline, N, N-diethylaniline, vanadium phosphate, etc.).

⑸ Accelerators for fast curing acrylate structural adhesive (NA-22, tetramethylthiourea, acetylacetone vanadium, acetylacetone, triphenylphosphine, n-butyraldehyde aniline condensate 808, benzyldimethylamine).

(6) Accelerator for anaerobic adhesive (N, N-dimethyl-p-methylaniline, triethylamine, hydroquinoline, 8-hydroxyquinoline, saccharin, ferrocene, aluminum triacetylacetonate).

(7) Accelerator for rubber and rubber type adhesive (accelerator D DETU、DPG、M、TMTD、BZ、PZ、ZDC、CZ）。

Function classification

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Mechanism and influence: Vulcanization accelerator It is called accelerator for short. Can promote Sulfuration Substances. Rubber shortening Vulcanization time Or reduce the curing temperature Vulcanizing agent And improve the physical and mechanical properties of rubber. It can be divided into two categories: inorganic accelerator and organic accelerator. In inorganic accelerator, zinc oxide magnesium oxide , lead oxide and so on, the rest are mainly used as accelerants. Most of them are organic accelerators. There are many kinds. Some of the vulcanizing accelerators have a bitter taste (such as Vulcanization accelerator M ）Some make products discolor (such as vulcanization accelerator D), some have vulcanization effect (such as vulcanization accelerator TT), and some have anti-aging or plasticizing effect (such as vulcanization accelerator M).

Action speed: according to the action speed, it can be divided into slow speed, medium speed, medium overspeed, overspeed, overspeed and other accelerators. In addition, there are after effect accelerators. Mainly organic compounds containing nitrogen and sulfur, including aldehydes and amines (such as vulcanization accelerator H), guanidine (such as vulcanization accelerator D) Chouram Class A (such as vulcanization accelerator TT), thiazole (such as Vulcanization accelerator M ）, dithiocarbamate (such as vulcanization accelerator ZDMC) Xanthic acid Salts (e.g Vulcanization accelerator ZBX ）, thiourea (such as vulcanization accelerator NA-22), sulfenamide (such as vulcanization Accelerator CZ ）Etc. Generally, it is used separately or in combination according to specific conditions.

Selection

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⑴ Select effective accelerators according to different types of adhesives.

(2) The accelerator and curing agent shall have good matching, non resistance and coordination.

⑶ The dosage shall be small and the promotion efficiency shall be high.

(4) It will not affect the process performance and physical and mechanical properties of the adhesive.

⑸ Mix two or more accelerators to learn from each other and increase the promotion effect.

(6) Non toxic or low toxic, no harm to human body and environment.

Developments

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The development of accelerators is high performance, multi-function and environmental protection. Germany launched Deovolc BGl87 and Rhencure AP series mixed accelerator, which has high promotion efficiency and will not produce nitrosamines. Vulkacit CRV/LG (3-methylthiazolidine-thioketone-2), a new product of Bayer, Germany, can replace NA-22 suspected of carcinogenesis and is suitable for chloroprene rubber. Multifunctional promoters also have the functions of other auxiliaries, such as 1 - (N-oxydiethylene thiocarbamyl) - 2 - (N-oxydiethylene) thiobenzimidazole (MBSPT), which has the effects of both promoters and antiagers. Its antiaging effect is comparable to 4010NA and superior to that of antioxidant MB.

Combustion dosage form

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Combustion promoter

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AMERGY5000 combustion accelerator contains a unique mixture of various organic metal media catalyzer , main role

It can promote oxidation combustion of heavy fuel oil and promote more complete combustion of fuel oil. It can be completely dissolved in all levels of fuel oil,

accelerator

It can be used in diesel engine and boiler devices. Marine oil usually contains residue after thermal cracking and residue with higher aromatic hydrocarbon group, which results in lower ignition quality, ignition delay and excessive fuel injection. If there is too much heat release and high pressure rise during combustion.

The accelerator will cause the thermal and mechanical load to be higher than the maximum continuous output of the engine. In addition, due to poor combustion, the fuel injection nozzle will be blocked, carbon will be deposited on the piston ring, booster and smoke exhaust pipe will catch fire, etc.

During boiler operation, due to the high carbon content of fuel oil, similar to incomplete combustion, carbon deposits in the superheater of boiler tube, even the economizer is blocked, and more carbon particles are discharged from the flue.

During combustion, free ions are released from the combustion catalyst contained in AMERGY500, which can carry oxygen to the combustion center to improve the mixing ratio of fuel and air and make combustion more complete. Because the combustion is more complete, the carbon accumulated in the engine, exhaust system and boiler due to incomplete combustion will be less.

characteristic

1. High efficiency combination, mixed with more efficient organic gold, reducing carbon deposition in piston rings and grooves

genus chemical compound Combustion catalyst

2. The lubricating oil is clean after use

3. Maintain TBN value in lubricating oil

4. Reduce carbon deposition on the exhaust side and in the supercharger

5. Keep the heat transfer surface clean

6. Improve the mixing rate of fuel and air

7. Reduce the emission of carbon particles from the exhaust side

8. Improve combustion efficiency and reduce black smoke

9. No separation and precipitation. Very stable in storage, no deterioration

other

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Microbial culture medium promoter

concept

Promoters refer to those nutrients that are not necessary for cell growth, and are not precursors, but can increase the output after being added.

effect

Promoters that are not precursors or nutrients can affect normal metabolism, promote the accumulation of intermediate metabolites, or increase the production of secondary metabolites

for example

◇ Barbital can increase the anti autolysis ability of streptomycin producing bacteria, delay the autolysis time, and increase the accumulation of streptomycin.

◇ When Corynebacterium glutamicum produces lysine, adding erythromycin can increase the output by more than 25%.

Action mechanism

The mechanism of increasing the output of accelerators is not completely clear, and the reasons are various.

For example, in the production of enzyme preparations, some promoters themselves are enzyme Inducer of; Some promoters are surfactants, which can improve the permeability of cells, improve the contact between cells and oxygen, thus promoting the secretion and production of enzymes. Others believe that surfactants can protect the surface inactivation of enzymes; Some promoters are used to precipitate or chelate harmful metal ions.

The effect of various promoters is not only affected by the strain and age, but also related to the composition of the culture medium used. Even if the same promoter is used to produce the same product with the same strain, the effect will be different when using different culture media.

Usage

The addition ratio of AMERGY5000 combustion accelerator is 1/1000~1/6000 and fuel mixture ratio. Other specific adding proportion can be determined according to the design of engine and boiler, fuel quality and system operation process. AMERGY5000 can be directly added to the fuel tank during refueling to reduce mixing time, or added to the fuel tank before refueling to promote complete mixing with fuel. The most correct way to add AMERGY5000 is to use a constant displacement pump to continuously add fuel system Medium.

physical property

accelerator

Appearance: clear, dark brown Specific gravity of liquid: 0.98 (at 25 ℃)

Flash point:>60 ℃

Flow point: - 46 ℃

Solubility: completely dissolved in oil

Accelerator-928 adhesion promoter

Applicable system

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accelerator

PU/NC、NC/PA、CAB、PVB、EVA、PU、 chlorination polyolefin Technical indicators of other ink systems:

Color: transparent yellow liquid

Solid content: 50%

Specific gravity: 1.00 ± 0.5

Flash point: 25 ℃

Viscosity: Charn 4 # cup 30.5 ± 0.5S (normal temperature)

PH value: 6

Amount added: 5-10%

4、 Packaging:

25KG/180KG

Guild rules

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(Draft for Comments Prepared by China Rubber Industry Association)

Normative purpose

This specification is formulated to further improve the quality level of vulcanization accelerator NS products, better meet the requirements of rubber industry products, create product brands and cultivate famous brand products, improve the competitiveness of enterprises, and increase economic and social benefits.

This specification is applicable to the vulcanization accelerator NS, which is made of industrial tert butylamine and vulcanization accelerator MBT by oxidation of sodium hypochlorite.

Trade name: vulcanization accelerator NS

English abbreviation: TBBS

Chemical name: N-tert-butyl-2-benzothiazole sulfenamide

Molecular formula: C11H14N2S2

Structural type:

Normative indicators

The technical indicators of vulcanization accelerator NS brand products shall meet the requirements in the following table:

Project indicators

Appearance milky white or yellowish brown powder, granular

Purity,% ≥ 97.0

Free amine,% ≤ 0.50

Initial melting point, ℃ ≥ 105.0

Heating loss (60~65 ℃),% ≤ 0.40

Ash content,% ≤ 0.40

Sieve residue (149µ m),% ≤ 0.10

Methanol insoluble,% ≤ 0.50

Note: grain NS is not used as sieve residue.

Self discipline management

3.1 Management function

The Additive Professional Committee of China Rubber Industry Association is the organization, implementation and coordination body of the self-discipline specifications of the accelerator product industry. The specific work is in the charge of the Additive Expert Group of the Technical and Economic Commission.

3.2 Quality credit

according to Rubber additive Classify and implement quality credit for rubber auxiliary products.

3. 3 Quality inspection

All NS brand products applying for vulcanization accelerator and brands passing quality credit shall be subject to quality inspection at least once a year.

Attachment: Test methods, inspection rules and regulations on marking, packaging, transportation and storage of vulcanization accelerator NS products.

Attachment: Inspection Rules for Test Methods of Vulcanization Accelerator NS Products

Storage regulations

accelerator

1. Test method 1.1 Appearance: visual inspection

1. 2 Purity and free amine determination

2.1 Instrument

10ml buret, 50ml buret, balance, mortar, laboratory standard glassware, water bath

1. 2.2 Reagent

⒈2.2.1 solvent : Isopropanol and toluene Prepare with 5:3 volume ratio

1. 2.2.2 Titrant: 0.1mol/L hydrochloric acid, 0.5mol/L hydrochloric acid

1. 2.2.3 Bromophenol blue indicator: 0.5g/L dissolve bromophenol blue at 96% ethanol within

1. 2.2.4 Reducing agent: M solution - 40g/L mercaptobenzothiazole dissolved in 96% ethanol (replaced every week)

1. 2.2.5 Titrant: 0.1mol/L sodium hydroxide

1. 2.3 Test steps

Preparation: at least 10g sample is put into a mortar and ground into a uniform fine powder for standby,

1. 2.3.1 Weigh a certain amount of fine powder sample (accurate to 0.1mg) and put it into a 250ml triangular flask (see the table for weighing amount).

1. 2.3.2 Add 100ml isopropanol/toluene solvent, and dissolve the sample by shaking and stirring to avoid heating.

1. 2.3.3 Add 8 drops of bromophenol blue indicator.

1. 2.3.4 Stir and titrate with 0.1mol/L hydrochloric acid until the green disappears and yellow appears. This only requires a few drops. Record the volume of hydrochloric acid used (titrate quickly to prevent hydrolysis of sulfosamide).

1. 2.3.5 Add 50ml reducing agent, and then add 25.00ml0.1mol/L hydrochloric acid accurately, mix it, and make it react according to the water bath temperature and time required in the table.

1. 2.3.6 Stir and titrate with 0.1mol/L sodium hydroxide until yellow disappears and blue appears. Record the volume of sodium hydroxide consumed.

1. 2.3.7 Conduct another blank test without sample for comparison.

calculation:

Free amine sulfenamide

Wherein, V1 -------------------- Volume of hydrochloric acid consumed by titration sample ml

V2 -------------------- Volume of hydrochloric acid consumed in titration blank ml

V3 -------------------- Volume of sodium hydroxide consumed in titration blank ml

V4 -------------------- Volume of sodium hydroxide consumed by titration sample ml

C1 -------------------- Concentration of hydrochloric acid standard solution mol/L

C2 -------------------- Concentration of sodium hydroxide standard solution mol/L

M --------------- Sample mass g

0.0731 ------------ Free amine coefficient

0.2384 --------- subsulfonamide coefficient

Relevant data sheet

Weighing mass of subsulfonamide accelerator sample (g) Required water bath reaction time (min) Temperature (℃)

CZ(CBS) 0.37 5±1 25±1

NS(TBBS) 0.33 5±1 25±1

DZ(DCBS) 0.48 15±1 55±1

NOBS(MBS) 0.35 15±1 55±1

1. 3 Melting point measurement

3.1 According to GB/T11409.1 (capillary method).

1. 3.2 Allowable difference: the difference between two results of parallel measurement shall not be greater than 0.5 ℃, and the arithmetic mean of the two results of parallel measurement shall be taken as the melting point of the sample.

1. 4 Heating decrement

4.1 The heating temperature shall be 60~65 ℃ according to GB/T11409.4.

1. 4.2 Allowable difference: the difference between two results of parallel measurement shall not be greater than 0.05%, and the arithmetic mean of the two results of parallel measurement shall be taken as the heating loss of the sample.

1. 5 Determination of ash content

1. 5.1 It shall be carried out according to the provisions of GB/T11409.7, with the sample weight of 3.0g and the burning temperature of 800 ± 10 ℃.

1. 5.2 Allowable difference: the difference between two results of parallel measurement is not more than 0.04%, and the arithmetic mean of the two results of parallel measurement is the ash content of the sample.

1. 6 Determination of sieve residue

1. 6.1 According to GB/T11409.5 (dry method), standard sieve specification: ￠ 200 ㎜× 50 ㎜/149µ m。

1. 6.2 Allowable difference: the difference between two results measured in parallel shall not be greater than 20% of the arithmetic mean, and the arithmetic mean of the two results measured in parallel shall be taken as the sieve residue of the sample.

1. 7 Determination of methanol insoluble matter

7.1 Instrument

a) Sand core crucible 30mLl (4 ＃);

b) Suction filtration bottle 500mL;

c) Dryer;

d) Electro optical analytical balance;

e) Electric thermostat;

1. 7.2 Reagent

Methanol, analytically pure

1. 7.3 Measurement steps

Weigh 1g of sample (accurate to 0.1mg) and place it in a core crucible that has passed constant weight in an oven at 70~75 ℃. Place the core crucible on the suction bottle and connect it with the vacuum pump. Add 20mL of hot methanol at about 50 ℃ and stir it evenly,

Allow it to stand for 5min to dissolve, and then start suction filtration. Then wash it four times with 20mL of hot methanol at about 50 ℃ each time. After drying, take out the core crucible and put it into an oven at 70~75 ℃ to dry for 30min, and move it into a dryer to cool to room temperature , weighing.

1. 7.4 Expression and calculation of results

methanol The percentage content of insoluble matter X is calculated according to the following formula:

m1－m2

X=×100

Where: m1 -- mass of sand core crucible and residue, g;

M2 - mass of sand core crucible, g;

M - sample mass, g;

1. 7.5 Tolerance

The difference between the two results of parallel measurement is not more than 0.10%, and the arithmetic mean value is taken as the measurement result.

2. Sampling

2. 4 If an inspection result does not meet the requirements of this standard, the item shall be sampled from twice the packaging containers for reexamination. If the reexamination result still does not meet the standard, the batch of products shall be judged as nonconforming products.

2. Inspection rules

2.1 Delivery inspection

Accelerator NS Self inspection shall be carried out by the inspection department of the manufacturer. manufacturer It shall be ensured that all accelerator NS delivered from the factory meet the requirements of technical conditions, and each batch of accelerator NS delivered from the factory shall be attached with a quality certificate in a certain format.

2.2 Inspection by national testing center

The Material Research and Testing Center of China Rubber Industry Association is responsible for spot checking and testing the quality of accelerator NS according to the requirements of this specification, and publishing it on relevant media.

2. 3 Batch rules

The uniform products packed each time are regarded as a batch.

2.4 Sampling and sampling method:

Sampling can be done directly in the market or in the production enterprises.

Sampling method: according to Table 2 of GB/T6678. After carefully mixing the samples, take out not less than 300g of samples by quartering method, and put them into two clean and dry grinding bottles or self sealing bags respectively. The bottle mouth shall be sealed and the name of the manufacturer, product name, batch number, sampling date and the name of the sampler shall be indicated. One bottle (bag) shall be inspected, and the other bottle shall be stored in a dark place for recheck. The storage period is three months.

2.5 Re inspection

If one or more items in the inspection results do not meet the requirements of this specification, the item shall be re sampled from twice the quantity of packaging for re inspection. If the re inspection results still do not conform to this standard, this batch of products are not in conformity with the famous brand products.

3. Mark, label and package

3.1 The product is divided into routine inspection and full item inspection. Routine inspection items: appearance melting point And heating reduction; All item inspection refers to the regular inspection of warehoused products.

Promoter 3.2 products shall be inspected by the quality inspection department, and can be delivered for sale only after they meet the requirements of this standard, with inspection reports attached.

3. 3 The products are a batch every day, and the product name, manufacturer, batch number, net weight, etc. shall be marked on the factory packaging bag.

3. 4 The product packaging bag should be "three in one" (the outer layer is kraft paper, and the middle layer is polyethylene The inner layer is made of plastic woven cloth by hot pressing) paper plastic composite bag, each bag is 20+0.1kg.

3. 5 Packaged products shall be stored in a cool and dry warehouse, which shall be more than 0.5m away from the wall, and shall not be placed directly on the ground or close to the fire source. The storage period of the product is 6 months.

3. 6 The product shall be protected from sun, rain and moisture during transportation, and handled with care during loading and unloading to prevent damage and leakage.

Poisoning symptoms

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Nausea vomit , abdominal pain, diarrhea, headache, dizziness, increased heart rate and respiration, decreased blood pressure, convulsions, circulatory failure, and even death due to respiratory center paralysis.

First aid treatment

Those who eat by mistake should immediately induce vomiting, gastric lavage and catharsis, and receive symptomatic treatment. Avoid oily food and alcohol.

matters needing attention

[1] It can not be mixed with lime, sulfur, copper agent and lead arsenate. It mainly focuses on disease prevention and should be used early.

[2] The agent shall be stored in a cool and dry place.

Accelerator specification

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Accelerator 'promoter. When used together with catalyst or fixative, it is a substance with less amount that can improve the reaction rate. Mainly organic compounds containing nitrogen and sulfur, including aldehydes and amines (such as vulcanization accelerator H), guanidine (such as vulcanization accelerator D), thiuram (such as vulcanization accelerator TT), thiazole (such as vulcanization accelerator M), dithiocarbamate (such as vulcanization accelerator ZDMC), xanthate (such as vulcanization accelerator ZBX), thiourea (such as vulcanization accelerator NA-22) Hyposulphonamide (such as vulcanization accelerator CZ), etc. Generally, it is used separately or in combination according to specific conditions.

nature

This product is a white powder, which sublimates and decomposes when heated to 200 ℃. It can be ignited with an open flame at normal temperature, and is insoluble in ether, aromatic hydrocarbons, etc. Usage: Mainly used in radial tires. First, it is used as the curing agent of reinforcing resin to improve the hardness of rubber products; Second, it forms an adhesive system with resorcinol and other additives, which plays an important role in the adhesion of rubber and fiber.

packing

Packed in woven bags lined with plastic bags, each bag has a net weight of 20kg.

keep in storage

It shall be stored indoors, dry and ventilated, high temperature proof and fireproof, and the storage period shall be half a year. If the storage period is exceeded, the qualified ones can still be used.

Combustion promoter

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explain

AMERGY5000 combustion promoter contains a unique mixture of various organic metal catalyst, which plays a major role in

It can promote oxidation combustion of heavy fuel oil and promote more complete combustion of fuel oil. It can be completely dissolved in all levels of fuel oil,

It can be used in diesel engine and boiler devices.

Marine oil usually contains residue after thermal cracking and residue with higher aromatic hydrocarbon group, which results in lower ignition quality, ignition delay and excessive fuel injection. If there is too much heat release and high pressure rise during combustion.

characteristic

Benefits:

·High efficiency combination, mixed with more efficient organic gold, reducing carbon deposition in piston rings and grooves

Combustion catalyst

·The lubricating oil is clean after use. Maintain the TBN value in the lubricating oil

·Reduce carbon deposition on the exhaust side and in the supercharger

·Maintain a clean heat transfer surface

·Increase the mixing rate of fuel and air

·Reduce the emission of carbon particles from the exhaust side

·Improve combustion efficiency and reduce black smoke emission

·No separation and sedimentation, very stable in storage, no deterioration

Usage

The addition ratio of AMERGY5000 combustion accelerator is 1/1000~1/6000 and fuel mixture ratio. other

The specific addition ratio can be determined according to the design of the engine and boiler, the quality of the fuel oil and the operation process of the system.

AMERGY5000 can be directly added to the fuel tank during refueling to reduce mixing time, or

First add it to the fuel tank to promote complete mixing with fuel.

The most correct way to add AMERGY5000 is to use a constant displacement pump to continuously

Add to the fuel system.

physical property

Appearance: clear, dark brown liquid

Specific gravity: 0.98 (at 25 ℃)

Flash point:>60 ℃

Flow point: - 46 ℃

Solubility: completely dissolved in oil

Special polyester

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Product Introduction

928 is a special polyester adhesion promoter, which has good stability at room temperature and is conducive to the storage stability of ink. When the temperature rises to a certain extent, its active group will cross link with the active group of resin and substrate. The adhesion of the ink is improved, and the heat resistance, chemical resistance, water resistance and other physical properties of the ink will be improved. Its main advantages are as follows:

1. Improve the adhesion of ink to various materials (treated OPP/PE/PP/PET/nylon/aluminum foil/metal/glass, etc.)

2. Improve the thermal stability of ink

3. Improve the water resistance and chemical resistance of ink

4. Improve the gloss of ink

5. Improve the dispersion of ink in ink

Applicable system

PU /NC、 NC /PA、 CAB 、PVB、 EVA , PU, chlorinated polyolefin and other ink systems

Technical indicators

Color: transparent yellow liquid

Solid content: 50%

Specific gravity: 1.00 ± 0.5

Flash point: 25 ℃

Viscosity: Charn 4 # cup 30.5 ± 0.5S (normal temperature)

PH value: 6

Amount added: 5-10%

packing

25KG/180KG

accelerator -Self discipline specification for vulcanization accelerator quality industry

(Draft for Comments Prepared by China Rubber Industry Association)

1. Normative purpose

This specification is applicable to the vulcanization accelerator NS, which is made of industrial tert butylamine and vulcanization accelerator MBT by oxidation of sodium hypochlorite.

Trade name: vulcanization accelerator NS

English abbreviation: TBBS

Chemical name: N-tert-butyl-2-benzothiazole sulfenamide

Molecular formula: C11H14N2S2

Structural type:

2. Normative indicators

The technical indicators of vulcanization accelerator NS brand products shall meet the requirements in the following table:

Project indicators

Appearance milky white or yellowish brown powder, granular

Purity,% ≥ 97.0

Free amine,% ≤ 0.50

Initial melting point, ℃ ≥ 105.0

Heating loss (60~65 ℃),% ≤ 0.40

Ash content,% ≤ 0.40

Sieve residue (149 µ m),% ≤ 0.10

Methanol insoluble,% ≤ 0.50

Note: NS of particles is not used as sieve residue.

3. Self discipline management

3.1 Management function

The Auxiliary Professional Committee of China Rubber Industry Association is a vulcanization accelerator NS

The specific work of the organization, implementation and coordination organization of the self-discipline specifications of the accelerator product industry shall be in the charge of the Additive Expert Group of the Technical and Economic Commission.

3.2 Quality credit

According to the classification of rubber additives, carry out quality credit for rubber additives.

3.3 Quality inspection

All NS brand products applying for vulcanization accelerator and brands passing quality credit shall be subject to quality inspection at least once a year.

Attachment: Test methods, inspection rules and regulations on marking, packaging, transportation and storage of vulcanization accelerator NS products.

Attachment: Inspection Rules for Test Methods of Vulcanization Accelerator NS Products

Marking, packaging, transportation and storage regulations

1. Test method

1.1 Appearance: visual inspection

1.2 Purity and free amine determination

1.2.1 Instrument

10ml buret, 50ml buret, balance, mortar, laboratory standard glassware, water bath

1.2.2 Reagents

1.2.2.1 Solvent: isopropanol and toluene in 5:3 volume ratio

1.2.2.2 Titrant: 0.1mol/L hydrochloric acid, 0.5mol/L hydrochloric acid

1.2.2.3 Bromophenol blue indicator: 0.5g/L dissolve bromophenol blue in 96% ethanol

1.2.2.4 Reductant: M solution - 40g/L mercaptobenzothiazole dissolved in 96% ethanol (replaced every week)

1.2.2.5 Titrant: 0.1mol/L sodium hydroxide

1.2.3 Test steps

Preparation: at least 10g sample is put into a mortar and ground into a uniform fine powder for standby,

1.2.3.1 Weigh a certain amount of fine powder sample (accurate to 0.1mg) and put it into a 250ml triangular flask (see the table for weighing amount).

1.2.3.2 Add 100ml isopropanol/toluene solvent, and dissolve the sample by shaking and stirring to avoid heating.

1.2.3.3 Add 8 drops of bromophenol blue indicator.

1.2.3.4 Stir and titrate with 0.1mol/L hydrochloric acid until the green disappears and yellow appears. This only requires a few drops. Record the volume of hydrochloric acid used (titrate quickly to prevent hydrolysis of sulfosamide).

1.2.3.5 Add 50ml reducing agent, add 25.00ml0.1mol/L hydrochloric acid accurately, mix, and make it react according to the water bath temperature and time required in the table.

1.2.3.6 Stir and titrate with 0.1mol/L sodium hydroxide until yellow disappears and blue appears, and record the volume of sodium hydroxide consumed.

1.2.3.7 Conduct another blank test without sample for comparison.

calculation:

Free amine sulfenamide

Wherein, V1 -------------------- Volume of hydrochloric acid consumed by titration sample ml

V2 -------------------- Volume of hydrochloric acid consumed in titration blank ml

V3 -------------------- Volume of sodium hydroxide consumed in titration blank ml

V4 -------------------- Volume of sodium hydroxide consumed by titration sample ml

C1 -------------------- Concentration of hydrochloric acid standard solution mol/L

C2 -------------------- Concentration of sodium hydroxide standard solution mol/L

M --------------- Sample mass g

0.0731 ------------ Free amine coefficient

0.2384 --------- subsulfonamide coefficient

Relevant data sheet

Weighing mass of subsulfonamide accelerator sample (g) Required water bath reaction time (min) Temperature (℃)

CZ(CBS) 0.37 5±1 25±1

NS(TBBS) 0.33 5±1 25±1

DZ(DCBS) 0.48 15±1 55±1

NOBS(MBS) 0.35 15±1 55±1

1.3 Melting point measurement

1.3.1 According to GB/T11409.1 (capillary method).

1.3.2 Tolerance: the difference between two results of parallel measurement shall not be greater than 0.5 ℃, and the arithmetic mean of the two results of parallel measurement shall be taken as the melting point of the sample.

1.4 Heating reduction

1.4.1 According to GB/T11409.4, the heating temperature is 60~65 ℃.

1.4.2 Allowable difference: the difference between two results measured in parallel shall not be greater than 0.05%, and the arithmetic mean of the two results measured in parallel shall be taken as the heating loss of the sample.

1.5 Determination of ash

1.5.1 It shall be carried out according to the provisions of GB/T11409.7, the sample weight shall be 3.0g, and the burning temperature shall be 800 ± 10 ℃.

1.5.2 Allowable difference: the difference between two results measured in parallel shall not be greater than 0.04%, and the arithmetic mean of the two results measured in parallel shall be the ash content of the sample.

1.6 Determination of sieve residue

1.6.1 According to GB/T11409.5 (dry method), the specification of standard sieve is ￠ 200 ㎜× 50 ㎜/149 µ m.

1.6.2 Allowable difference: the difference between two results measured in parallel shall not be greater than 20% of the arithmetic mean, and the arithmetic mean of the two results measured in parallel shall be taken as the sieve residue of the sample.

1.7 Determination of methanol insoluble matter

1.7.1 Instrument

a) Sand core crucible 30mLl (4 ＃);

b) Suction filtration bottle 500mL;

c) Dryer;

d) Electro optical analytical balance;

e) Electric thermostat;

1.7.2 Reagents

Methanol, analytically pure

1.7.3 Measurement steps

After the accelerator is allowed to stand for 5min to dissolve, start to filter by suction, and then wash it four times with 20mL of hot methanol at about 50 ℃ each time. After drying, take out the core crucible and put it into an oven at 70~75 ℃ to dry for 30min, transfer it to a dryer to cool to room temperature, and weigh it.

1.7.4 Expression and calculation of results

The percentage content X of methanol insoluble matter is calculated as follows:

m1－m2

X=×100

Where: m1 -- mass of sand core crucible and residue, g;

M2 - mass of sand core crucible, g;

M - sample mass, g;

1.7.5 Tolerance

The difference between the two results of parallel measurement is not more than 0.10%, and the arithmetic mean value is taken as the measurement result.

2. Sampling

2.4 If an inspection result does not meet the requirements of this standard, samples shall be taken from twice the packaging containers to recheck the item. If the recheck result still does not meet the standard, the batch of products shall be judged as nonconforming products.

2. Inspection rules

2.1 Delivery inspection

The accelerator NS shall be self inspected by the inspection department of the manufacturer. The manufacturer shall ensure that all accelerator NS delivered from the factory meet the requirements of the technical conditions, and each batch of accelerator NS delivered from the factory shall be attached with a quality certificate in a certain format.

2.2 Inspection by national testing center

2.3 Batch rules

The uniform products packed each time are regarded as a batch.

2.4 Sampling and sampling method:

Sampling can be done directly in the market or in the production enterprises.

2.5 Re inspection

3. Mark, label and package

3.1 Products are divided into routine inspection and full item inspection. Routine inspection items: appearance, melting point and heating loss; All item inspection refers to the regular inspection of warehoused products.

Promoter 3.2 products shall be inspected by the quality inspection department, and can be delivered for sale only after they meet the requirements of this standard, with inspection reports attached.

3.3 The products are a batch every day, and the product name, manufacturer, batch number, net weight, etc. shall be marked on the factory packaging bag.

3.4 The product packaging bag shall be a "three in one" paper plastic composite bag (the outer layer is kraft paper, the middle layer is polyethylene, and the inner layer is plastic woven cloth that is hot pressed into one), and each bag is 20+0.1 kg.

3.5 Packaged products shall be stored in a cool and dry warehouse. The distance from the wall shall be more than 0.5m. They shall not be placed directly on the ground or close to the fire source. The storage period of the product is 6 months.

3.6 The product shall be protected from sun, rain and moisture during transportation, and handled with care during loading and unloading to prevent damage and leakage.

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