Acetylene black is composed ofCalcium carbideLaw ornaphtha(Crude gasoline) pyrolysis by-product gas with a purity of more than 99%acetylene, obtained after continuous pyrolysiscarbon black。After the internal temperature of the reaction furnace is raised to the initial temperature of acetylene decomposition above 800 ℃, acetylene is introduced for thermal decomposition.Because it is exothermic reaction, the reaction can be carried out automatically.In order to obtain stable quality, the reaction temperature should be kept at about 1800 ℃.The temperature in the furnace can be controlled through the water-cooled jacket of the outer cylinder of the reaction furnace.Acetylene black asNickel metal hydride batteryOfNegative materialSeparation from oxidationelectrolyteUsed together.Compared with furnace carbon black, its crystallization and secondary structure are more developed, so its conductivity and liquid absorption are also better.becauseheavy metalAnd other impurities are few, soSelf dischargeIt is mainly used for the negative pole of nickel hydrogen battery.
The appearance is black extremely fine powder with a relative density of 1.95 (nitrogen replacement method).The apparent density is 0.2~0.3 g/cm3.The average particle size is 30-45nm.The specific surface area is 55~70m2/g.Iodine absorption value is 60~80gI2/kg.Acetylene black has high purity, with carbon content of more than 99.5%, hydrogen content of less than 0.1%, and oxygen content of 0.07%~0.26%.The pH value is 5-7.With extremely low resistivity, it has excellent conductivity, thermal conductivity and anti-static effect.[1]
quality index
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Acetylene black quality index<br>
Index name
Powdery product
50% compressed product
75% compressed product
Eligibility
Premium
Qualified products
Qualified products
Heating loss/% [≤ 0.40]
zero point three zero
zero point four zero
zero point four zero
Ash/% [≤ 0.30]
zero point two zero
zero point three zero
zero point three zero
pH[6-8]
6-8
6-8
6-8
Apparent specific volume mL/g
[30～50]
14~17
13~17
9~12
Iodine absorption value/(gI2/kg) [≥ 80]
90~105
≥80
≥80
Hydrochloric acid absorption volume mL/g
[4.0]
four
three point eight
three
Resistivity/Q · m
≤3.0
two point five
three point five
five point five
application
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Used as antistatic agent.The electrostatic conductive emulsion pressure-sensitive adhesive can be made by adding the acrylate/vinyl acetate copolymer emulsion. When the addition amount is 1.2%, the conductivity can reach 7.2 × 103Q, which can be used to paste the electrostatic conductive PVC floor.It is also used as conductive filler to prepare conductive adhesive with low conductivity requirements.
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Acetylene carbon black is the carbon black obtained by continuous pyrolysis of acetylene with purity above 99%, which is obtained by calcium carbide method or decomposition and refining of by-product gas during naphtha (crude gasoline) pyrolysis.After the internal temperature of the reaction furnace is raised to the initial temperature of acetylene decomposition above 800 ℃, acetylene is introduced for thermal decomposition.Because it is exothermic reaction, the reaction can be carried out automatically.In order to obtain stable quality, the reaction temperature should be kept at about 1800 ℃.The temperature in the furnace can be controlled through the water-cooled jacket of the outer cylinder of the reaction furnace.Acetylene carbon black is used together with manganese dioxide and electrolyte as the anode material of manganese dry battery.Compared with furnace carbon black, its crystallization and secondary structure are more developed, so its conductivity and liquid absorption are also better.Due to less impurities such as heavy metals, the loss caused by self discharge is small and the storage performance is better.Acetylene black almost occupies the whole market in this field.It can be predicted that it will continue with the demand for dry batteries in the future.
