Neoprene

synthetic rubber

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Neoprene, made from Chloroprene (i.e. 2-chloro-1,3-butadiene) as the main raw material for α - polymerization synthetic rubber , widely used in anti weathering products Viscose Sole, paint and Rocket fuel 。

Chinese name: Neoprene
Foreign name: Chloroprene Rubber
Density: 1.23 to 1.25 g/cm ³
Glass transition temperature: -40-50 ℃

Embrittlement point: -35℃
softening point: About 80 ℃
Initial decomposition temperature: 230-260 ℃
Solubility: Soluble in chloroform, benzene, etc

catalog

performance

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The appearance is milky white Beige Or light brown flake or block Chloroprene (i.e. 2-chloro-1,3-butadiene) as the main raw material elastomer 。 Neoprene Solubility parameters Accounting for δ=9.2~9.41. Soluble in toluene 、 xylene 、 Dichloroethane Vanadium ethylene , slightly soluble in acetone 、 Methyl ethyl ketone 、 Ethyl acetate 、 cyclohexane , insoluble in N-Hexane 、 Solvent gasoline , but soluble in Good solvent and Bad solvent And non solvent or bad solvent and non solvent Mixed solvent , on vegetable oil and mineral oil Medium swelling but insoluble.

Good physics Mechanical properties , oil resistant, heat resistant, flame resistant, sunlight resistant, ozone resistant, acid and alkali resistant, chemical reagent resistant. The disadvantages are Cold tolerance And poor storage stability. With higher tensile strength 、 elongation And reversible Crystallinity Good adhesion. Aging resistance and heat resistance. Excellent oil and chemical resistance. Weatherability And resistance Ozone aging after EPDM and butyl rubber 。 Heat resistance And Nitrile rubber Equivalent, decomposition temperature 230~260 ℃, short-term Tolerable 120~150 ℃, long-term use at 80~100 ℃, with certain Flame retardancy 。 Oil resistance Second only to nitrile rubber. Resistance Inorganic acid Good alkali corrosion. Slightly poor cold resistance, Electrical insulation Not good. Raw rubber Poor storage stability will lead to "self sulfur" phenomenon, Mooney viscosity Increase and the raw rubber hardens.

application

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CR122 neoprene: Drive belt 、 Transport belt 、 Wire and cable 、 Oil resistant rubber plate Oil resistance Rubber hose 、 sealing material etc. Rubber products 。

CR232 neoprene: Cable sheath , oil resistant hose Rubber seals 、 adhesive Etc.

CR2441 2442 chloroprene rubber : The raw materials for adhesive production are used for bonding metal, wood, rubber, leather and other materials.

CR321 Type 322 neoprene: cable, rubber plate, ordinary and oil resistant rubber hose, oil resistant rubber boots Air duct , rain cloth, tent cloth Conveyor belt 、 Conveyor belt , rubber seals, agricultural capsule air cushion lifeboat Etc. Used for modification Acrylate fast Structural adhesive （ SGA ）Of Toughening agent 。

Brand

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According to GB5577

CR121 △: CR stands for neoprene; 1: Sulfur regulation; 2: Low crystallization rate; 1: Polluting antioxidant ； △： Mooney viscosity Range

CR322 △: CR stands for neoprene; 3: Type of regulator; 2: Low crystallization rate; 2: Non polluting antioxidant; △: Mooney viscosity range

Production method

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Neoprene rubber Emulsion polymerization Production technological process Most of them are single kettle Batch polymerization 。 Polymerization temperature Most of them are controlled at 40~60 ℃, Conversion rate About 90%. High polymerization temperature, high final conversion rate or air (oxygen) entering during polymerization will cause product quality Down. In production sulfur Sulfone － Chouram (Tetraalkylmethylaminothiocarbonyl) Disulfide ）The molecular weight is regulated by the system. The main disadvantage of the sulfur thiuram system is that the sulfur bond is not stable enough, which is one of the important reasons affecting the storage. If used mercaptan This property can be improved by adjusting the molecular weight. Neoprene and general synthetic rubber Different, it is not sulfurized with sulfur, but with zinc oxide 、 magnesium oxide Isosulfide.

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