Phthalic anhydride
Phthalic anhydride, phthalic anhydride, is a kind of important organic chemical raw materials, for the natural rubber, isoprene rubber, butadiene rubber, styrene-butadiene rubber and nitrile rubber universal antiscorching agent, can prevent coke burning, improving operation safety. The effect of aging on the time and product of vulcanization is very small. It is particularly effective for the use of the thiazole and thiazol-thiazole accelerator system and the alkali promoters, but does not apply to the sulfur-sulfide system. It is easy to disperse, not spray frost, the pollution is not small, but the white glue will also have a slight discoloration when it meets the light, it is not suitable for white glue. It can increase the foaming effect when it is used together with sodium bicarbonate for high promotion of sponge products. The main purpose of benzene anhydride is to be used as an organic intermediates for plasticizers, coatings and unsaturated polyester resins. Anhydride is also a widely used acid anhydride epoxy curing agent. Low price, low heat in curing, especially suitable for large casting products and laminated products. Curing has good electrical and mechanical strength, resistance to drugs is better (but poor) alkali resistance, heat deformation temperature of 110 ~ 147 ℃. General dosage 30 ~ 50, curing conditions: 100 + 150 ℃ / 5 ℃ / 2 h h. This product is sublimation, high melting point, the shorter service life (3.5 h under 110 ℃). The above information is compiled by the small new editor of the technology called "chemical".
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