Method of grafting and modifying rubber latex containing poly conjugated dialkene by in situ hybridization of silicon

Abstract

A method of grafting and modifying rubber latex containing poly conjugated dialkene by in situ hybridization of silicon includes the following steps taking 100 parts by mass of rubber latex containing poly conjugated dialkene, adding from 4 to 25 parts of organic siloxane monomers with unsaturated bond into the rubber latex containing poly conjugated dialkene, stirring sufficiently to obtain uniform mixture, adding from 0.20 to 0.36 parts of initiators with stirring at the temperature of 5-85 DEG C for carrying out graft polymerization reaction for 5 to 8 hours, and agglomerating and drying the grafted and modified rubber latex. The structure formula of organo-sillicone monomers with unsaturated bond is Y-Si(R1R2R3), wherein Y- is unsaturated aliphatic chain segment with 2 to 18 carbons, R1- is alkoxy with 1 to 12 carbons, aryloxya with 6 to 12 carbons or silicide with 3 to 12 carbons, and R2 and R3 are the same groups as R1 or can also be saturated chain segment with 1 to 20 carbons or annular alkane or aromatic hydrocarbon with 1 to 8 carbons.

Description

technical field [0001] The invention relates to a modification method of latex, in particular to a method for modifying latex containing polyconjugated diene by silicon in-situ graft hybridization. Background technique [0002] The so-called in-situ hybridization means that in the dispersed phase (reinforcement or functional body) and the continuous phase (matrix) of the composite system, at least one phase does not exist before composite processing, but during composite processing, in the Formed under the condition that another phase already exists. The in-situ hybrid modification of rubber refers to the process of grafting copolymerization or cohydrolysis to disperse the dispersed phase silicon in the rubber matrix in the form of chemical bonds or nanometer size, so as to improve its tearing performance, reduce heat generation and improve the performance of composite products. Adhesion of the compound to other components. Since silicon-modified rubber exhibits good low r...

AI Technical Summary

Problems solved by technology

The specific technical scheme is: first mix the mixture of block copolymer and zinc oxide with organosilane in the extruder, then use peroxide to degrade the polymer and initiate the silanization reaction at a temperature not lower than 140°C, and finally After a period of mixing, the grafting reaction of the entire silane is completed. The operation process of this method is complicated. At the same time, under high temperature conditions, the graft modifier is likely to self-polymerize and affect the graft polymerization reaction.

[0009] For the graft modification of emulsion rubber, commonly used monomers for grafting are ST (styrene), MMA (methyl methacrylate), MA (maleic acid), MAH (maleic anhydride) , MAA (methacrylic acid), AA (acrylic acid), etc. However, for the grafted monomers of organosilanes, because organosilanes are easily hydrolyzed in the phase and cause the instability of the emulsion, there are few research reports now. The patent adopts the method of adding organosilane dropwise to realize the grafting of organosilane modified rubber

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