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Core-shell type polysilsesquioxane/hydroxyl acrylate composite emulsion and preparation method thereof

The technology of polysilsesquioxane and hydroxy acrylate is applied in the field of preparation of water-based polysilsesquioxane/hydroxy acrylate composite emulsion, which can solve the problems of high temperature stickiness, limited performance expansion, low temperature embrittlement and the like

Active Publication Date: 2018-11-27
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the high-temperature sticky and low-temperature brittle characteristics of acrylate copolymers, the improvement of its performance and the expansion of its application are also limited.

Method used

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  • Core-shell type polysilsesquioxane/hydroxyl acrylate composite emulsion and preparation method thereof
  • Core-shell type polysilsesquioxane/hydroxyl acrylate composite emulsion and preparation method thereof
  • Core-shell type polysilsesquioxane/hydroxyl acrylate composite emulsion and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] (1) Core synthesis, i.e. preparation of polysilsesquioxane emulsion:

[0019] Dissolve 0.17g of sodium hydroxide, 0.34g of dibenzoyl resorcinol and 0.17g of allyloxynonylphenol polyoxyethylene ether ammonium sulfate in 285g of water at room temperature, pour them into a reaction kettle and stir. Add 45.45g of phenyltrimethoxysilane and 4.54g of γ-methacryloxypropyltrimethoxysilane dropwise into the reaction kettle, the dropping time is 2h, and the holding time is 15h. The hydrolysis polycondensation reaction is carried out under the catalysis of the basic catalyst to obtain the silsesquioxane emulsion.

[0020] (2) Intermediate layer synthesis:

[0021] At a reaction temperature of 50° C., 7.2 g of nonylphenol polyoxyethylene ether ammonium sulfate was mixed with the polysilsesquioxane emulsion prepared in (1) and then poured into a reaction kettle. Finally, 63.60g of methyl methacrylate, 9.53g of butyl acrylate, and 2.16g of γ-methacryloxypropyltrimethoxysilane were ...

Embodiment 2

[0026] In this example, when preparing the core-shell type polysilsesquioxane / hydroxyacrylate composite emulsion, the amount of hydroxypropyl methacrylate is kept constant, and the amount of other reagents is kept constant, which is the same as in Example 1. In steps (1), (2), and (3), the ratio of the total amount of monomers is changed to 0.8:1.2:8, wherein the amount of monomers is replaced in proportion.

Embodiment 3

[0028] In this example, when preparing the core-shell polysilsesquioxane / hydroxyacrylate composite emulsion, the amount of hydroxypropyl methacrylate is kept constant, and the amount of other reagents is kept constant, which is the same as in Example 1. Step (1)(2)(3) The total monomer ratio is changed to 1.2:1.8:7, wherein the monomer amount is replaced in proportion.

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Abstract

The invention discloses core-shell type polysilsesquioxane / hydroxyl acrylate composite emulsion and a preparation method thereof. The preparation method comprises the following steps: by taking polysilsesquioxane as the core, performing cross-linking entanglement on a silane coupling agent polymer and an internal layer in the middle; by taking a hydroxyl functional monomer as a main functional monomer on the shell layer, performing copolymerization with other acrylic monomers, thereby obtaining the 'hard-core soft-shell' water-based hydroxyl acrylate emulsion. The composite emulsion disclosedby the invention is composed of three parts, namely the core, the intermediate layer and the shell, the core is the polysilsesquioxane prepared from trialkoxysilane and a vinylsilane coupling agent; the intermediate shell is a copolymer of an acrylic monomer and the vinylsilane coupling agent; the vinylsilane coupling agent accounts for 3-10wt% of the mass of the total monomer on the intermediatelayer; the component of the shell layer is a copolymer of a hydroxyl functional monomer and an acrylic monomer; and the hydroxyl functional monomer accounts for 10-50wt% of the amount of the total monomer. Due to the existence of the hydroxyl functional monomer, the composite emulsion has excellent mechanical property after curing, and has excellent properties such as high adhesive force of plastics.

Description

technical field [0001] The invention relates to the technical field of polymer material synthesis. Specifically, it is a preparation method of a water-based polysilsesquioxane / hydroxyacrylate composite emulsion with a three-layer core-shell structure, which is mainly applicable to the fields of plastic coatings, wood coatings, anti-corrosion coatings and the like. Background technique [0002] In the face of increasingly serious environmental problems and the country, people's awareness of ecological and environmental protection has increased, and solvent-based coatings are no longer applicable. With its almost zero VOC emission, water-based paint is the direction of paint development. Water-based acrylic latex paint is an important variety of water-based paint. It has good weather resistance and good adhesion, and has been widely developed and applied. However, due to the high-temperature sticky and low-temperature brittle characteristics of acrylate copolymers, the impro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/20C08F220/14C08F220/18C08F230/08C09D133/14C09D133/12C09D183/04
CPCC08F220/14C08F220/20C09D133/12C09D133/14C09D183/04C08F220/1804C08F230/08C08F220/1808
Inventor 李效玉杨敏
Owner BEIJING UNIV OF CHEM TECH
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