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Basic knowledge of anti-scorching agent

date:2010-11-01 17:16
(A) of the rubber processing agents and anti-Coke Compound in the storage and processing occur because of the role of the early heat curing (crosslinking) and loss of liquidity and re-processing capacity, which is the scorch phenomenon. Sco

(A) of the rubber processing agents and anti-Coke
Compound in the storage and processing occur because of the role of the early heat curing (crosslinking) and loss of liquidity and re-processing capacity, which is the scorch phenomenon. Scorch rubber rubber processing common problems. Especially in the modern characteristics of high temperature, fast, efficient processing and distribution in the scorch easily lead to the use of ingredients (such as reinforcing resins, adhesives between a white system, fine particles of carbon black, etc.), the problem is more prone to scorch . Scorch can be resolved by adjusting the curing system,
Octylferrocene, but be careful cause changes in compound properties; can be cooled to improve the rubber material storage or processing conditions, but require complex equipment. Now widely accepted that anti-scorching agent is equipped with the most simple way to prevent scorch. Therefore, anti-scorching agent into the safety of rubber processing chemicals is an important operation.

(B) of the Anti-agent category and properties of coke
Rubber anti-scorching agent can be used as a chemical with three categories,
namely organic acids, nitroso compounds and sub-sulfonamide class.

(1) organic acids such as salicylic acid, benzoic acid, o-acetic acid, phthalic anhydride. Such chemicals scorch weak, selective large variety of promoters will reduce the cure rate and the vulcanizate, a stimulating effect on the skin. Among the more commonly used phthalic anhydride, can be used for light-colored rubber products, and only the basic accelerator DPG, MBT accelerator effective,CAS  51889-44-2
, NOBS, TMTD invalid.

(2) class of N-nitroso compounds nitroso diphenylamine, N-nitroso - phenyl-β-naphthylamine, N-nitroso -2,2,4 - trimethyl-1,2 - H quinoline polymers. One commonly used is the N-nitroso diphenylamine (NDPA). And organic acid different from the class of commonly used anti-scorching agent and sub-thiazole sulfonamide accelerator has a better anti-Jiaozuo use.

(3) times anti-scorching agent is a sulfonamide SN bond with a series of compounds