Preparation method of graft modified silicone oil

Abstract

The invention relates to a preparation method of graft modified silicone oil. Low-hydrogen silicone oil, allyl polyether, a catalyst and a buffering agent are introduced into a microreactor and subjected to a reaction at 60-160 DEG C under 0-20 bar for 20-1000 s, and the graft modified silicone oil is prepared. By means of the improved preparation method, content of residual monomers is reduced to5% or lower, the problem of too wide molecular weight of a polymer is solved, polydispersity index of the polymer is smaller than 1.2, reaction time is shortened substantially, and side effects are avoided effectively. The production process is simple to operate, low in energy consumption and environmentally friendly, product quality is improved, and little waste is produced.

Description

technical field [0001] The invention relates to a preparation method of graft modified silicone oil. Background technique [0002] At present, the domestic production of grafted silicone copolymers is mainly based on the batch method. In this method, the reactants such as low-hydrogen silicone oil, allyl polyether, buffer, and solvent are first added to the reactor and stirred, and the temperature is raised. After heating (80°C ~ 100°C), after a long time of heating (3-5h), add a catalyst (usually a platinum catalyst) directly into the kettle, keep warm for a certain period of time (3-5h) to complete the reaction, cool down and filter, etc. The process completes the production. [0003] The above method has the following disadvantages: [0004] 1) The residual amount of monomer and catalyst impurities is high; [0005] 2) The molecular weight distribution of the polymer is wide, and the molecular weight distribution Index>1.2; [0006] 3) There are side reactions in t...

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Problems solved by technology

[0006] 3) There are side reactions in the polymerization process;

[0007] 4) The reaction time is relatively long and the energy consumption is high;

[0008] 5) The process is complicated and the efficiency is low;

[0009] 6) The equipment investment is large and the land occupation is relatively large;

[0010] 7) The product needs to be cleaned, resulting in a large amount of solvent and waste water;

[0011] 8) There is a problem of amplification effect in the small test, pilot test and final mass production of the product

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