Rubber composition of chemically modified chlorinated polyethylene and unsaturated rubber and preparation method thereof

[0023] The preparation of the chlorinated polyethylene of embodiment 1 chemical modification

[0024] The chlorinated polyethylene of described chemical modification can be prepared according to the following method: the organic solvent of 600 weight parts, the chlorinated polyethylene of 60 weight parts are put into reactor (reflux condenser and mechanical stirring paddle are housed), in Stir continuously in a constant temperature heating bath at 50°C until the chlorinated polyethylene powder is uniformly dispersed in the solvent, at which point the chlorinated polyethylene reaches a partially swollen and partially dissolved state in the organic solvent. Then, 2 parts by weight of sodium N,N-diethyldithiocarbamate was dissolved in 50 parts by weight of dimethylformamide, and added dropwise into the reactor within 30 minutes, protected from light and continued to stir and heat for 24 hours. The reaction mixture is poured into 1000 parts by weight of distilled water to precipitate the substituted chlorinated polyethylene, and then washed three times with alcohol and distilled water in turn, and the obtained product is chemically modified chlorinated polyethylene. The sulfur-containing group on the side chain of the chemically modified chlorinated polyethylene acts as a vulcanization accelerator, and the content of this sulfur-containing group in the chemically modified chlorinated polyethylene can be in a wide range It can be adjusted arbitrarily, so there is no need to add vulcanization accelerator components in the vulcanization formula, and it also makes the distribution of vulcanization accelerator components in the rubber matrix more uniform.

[0025] Example 2

[0026] The formula of each component of the material is: 60 parts of chemically modified chlorinated polyethylene, 50 parts of natural rubber, 3 parts of sulfur and 3 parts of dicumyl peroxide as vulcanizing agent, 50 parts of carbon black as filling and strengthening agent, The plasticizer uses 5 parts of naphthenic oil and 5 parts of dioctyl phthalate, and the stabilizer uses 10 parts of magnesium oxide and 5 parts of lead stearate.

[0027] Preparation method: first mix the weighed chemically modified chlorinated polyethylene and natural rubber in an internal mixer at 90°C for 3 to 4 minutes; then add the weighed filling reinforcing agent and plasticizer in sequence , stabilizer and vulcanizing agent, and then knead for 3 to 5 minutes. When the mixing temperature reaches 100-105 ° C, discharge the mixed rubber from the internal mixer, and then pass the mixed rubber on the open mixer for 2 to 3 minutes. Second-rate. Then vulcanized at 150°C for 25 minutes. The properties of the prepared vulcanizates are listed in Table 1.