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Chemical name: N,N'-m-phenyl dimaleimide
Molecular formula:C14H8N2O4
Molecular weight:268.2
Quality standard:
| Appearance | yellow or brown powder |
| Loss on heat%≤ | 0.5(70°C /2h) |
| Ash %≤ | 0.5 |
| Melting point ≥ | 195°C |
Properties:
Yellow or brown powder, specific gravityis 1.44, soluble intetrahydrofuran and heat propanone, insoluble in petroleum ether,chloroform, benzene and water, melting point is higher than195°C.
Uses:
Being a kind of multifunctional rubbervulcanizing agent, PDM is used as vulcanizing agent and cocuringagent for peroxide system in rubber process. It is also used asantiscorching agent and viscosity increaser. It is not onlyapplicable to all-purpose rubber, but also specialty rubber and the combination system of rubber and plastic.
In natural rubber, when used together with sulfur, it canprevent sulfuration from reversing, perfecting heat and oxidantionresistance, reducing pyrogenesis, improving the adhesion betweenrubber and tire cord and the modulus of vulcanized rubber. Whenused in shoulder rubber and cushion breaker for lorry tire, itsolve the difficult question of shoulder hollow for oblique lorrytire. It is also used in thick products of natural rubber and otherrubber sundry goods.
When used as cocuring agent in neoprene rubber(CR),chlorosulfonated polyethylene rubber(CSM), styrene-butadienerubber(SBR), acrylonitrile-butadiene rubber(NBR), isoprenerubber(IR), butyl rubber(IIR), bromobutyl rubber, acrylicrubber(ACM), silicon rubber(SI) and other rubbers, PDM caneffectively improve correlation performance and heat resistance. Itis applicable to high-temperature vulcanization system showingeffective effect on reducing permanent compression deformation andthe use amount of peroxide, preventing gross rubber from scorchingduring process, improving the adhesion strength between grossrubber and tire cord or metal.
PDM is a kind of sulfurless vulcanizing agent. When used incable rubber, it can substitute for sulfurized vulcanizing agentsuch as thiazole type, thiuram and other, which solve theblackening of copper wire and copper electronic appliance becausethey contact with sulfurized vulcanizing agent to produce coppersulfide.
Dosage:
0.5-1.0 portion when used asantiscorching agent, 2-3 portion when used as vulcanizing agent,1.5 portion when used as compression deformation improving agent,0.5-5.0 portion when used as adhesion strength improving agent.
Packing:
composite bag, Net wt. 20kg.
rubber chemical HVA-2
rubber chemical HVA-2
