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Method for preparing organic silicon modified polyacrylic acid (polyacrylate) emulsion

A technology of polyacrylic acid and silicone, which is applied in the field of preparation of silicone-modified polyacrylic acid emulsion, which can solve the problems of affecting the activity of silicone, poor emulsion homogeneity, easy loss of light, etc., achieve good dispersion and stability, and shorten production time , The effect of simplifying the preparation process

Active Publication Date: 2004-11-17
广东鸿昌化工有限公司
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AI Technical Summary

Problems solved by technology

But there are also some disadvantages: such as easy loss of light, poor low temperature toughness, high water permeability, etc.
The cold blending method is simple to operate, but it is easy to cause two-phase separation and the storage period is short
The chemical method is generally to carry out emulsion copolymerization with organosiloxane monomers containing vinyl groups and acrylic acid (ester) monomers, but this kind of siloxane is easy to hydrolyze, which affects the activity of silicone, especially when the content of silicone When it is large, a large amount of coagulation (even overall gelation) will be produced during the emulsion polymerization process, making the reaction impossible to continue
Another way to prepare silicon-acrylic emulsion by chemical method is to carry out emulsion polymerization of acrylic acid (ester) monomer in the presence of silicone resin with functional groups, but the homogeneity of the emulsion obtained by this method is poor

Method used

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Embodiment 1

[0022] 1) Pre-emulsification: 0.8g sodium lauryl sulfate, 1.2g nonylphenol polyoxyethylene ether (OP-10), 1.0g ethoxylated alkylphenol ammonium sulfate (RHODAPEX CO-436, 58% ), 0.25g potassium persulfate, 0.4g dodecylbenzenesulfonic acid were dissolved in 130.0g deionized water, after stirring evenly, 48.5g butyl acrylate, 48.5g methyl methacrylate, 1.5g acrylic acid, 2.0g N-methylolacrylamide, 5.0g α-hydroxypropyl acrylate, 18.5g octamethylcyclotetrasiloxane, 1.3g γ-methacryloxypropyltrimethoxysilane, 1.5g cetyl alcohol Add the mixture, and stir to obtain a pre-emulsion for later use.

[0023] 2) Synthesis of silicon-acrylic emulsion: in a reaction flask equipped with a thermometer, a stirrer, a reflux condenser and a dropping funnel, 0.5g sodium lauryl sulfate, 0.6g nonylphenol polyoxyethylene ether (OP -10), 0.5g ethoxylated alkylphenol ammonium sulfate (RHODAPEX CO-436), 0.3g potassium persulfate, 0.3g dodecylbenzenesulfonic acid were added to 50g deionized water, stirred...

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Abstract

The invention discloses a process for preparing organic silicon modified polyacrylic acid (polyacrylate) emulsion with high organic silicon content (15%-25%), wherein the ring-opening polymerization of epoxy silane is carried out simultaneously with the free radical polymerization of vinyl monomer, i.e., (1) ring-opening polymerization occurs to epoxy silane at the presence of catalyst, and organic (ring) siloxane containing unsaturated bonds polycondensation is carried out, thus producing organosilicon resin and organosilicon resin containing unsaturated double bonds, (2) at the presence of initiating agent, the free radical polymerization of vinyl monomer is carried out, and in-situ graft polymerization of organosilicon resin containing unsaturated bonds is carried out to prepare organic silicon-g polyacrylic acid (ester) grafted copolymer (as compatiblizing agent).

Description

technical field [0001] The invention relates to a preparation method of silicone-modified polyacrylic acid (ester) emulsion (hereinafter referred to as silicone-acrylic emulsion), especially a preparation method of silicone-acrylic emulsion with high organic silicon content (15%-25%). Background technique [0002] Acrylic (ester) resin coatings are new varieties of coatings developed in the 1950s. It has the following advantages: light color, excellent transparency, no discoloration, acid, alkali and salt resistance, grease resistance, etc. But there are also some disadvantages: such as easy loss of light, poor low temperature toughness, high water permeability, etc. In order to make up for these deficiencies in the performance of acrylic (ester) resins, it is generally necessary to modify acrylic (ester) resins. The modification technology of acrylic (ester) resins is mainly related to silicone. Silicone resins for coatings use Si-O-Si as the main chain. Because the bond ...

Claims

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Application Information

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IPC IPC(8): C08F2/22C08F230/08
Inventor 王俊卿曾汉民洪星蔡国衡
Owner 广东鸿昌化工有限公司
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