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Silicon dioxide/polyacrylate/polysiloxane composite emulsion as well as preparation method and application thereof

A technology based on acrylate and silica, applied in the direction of antifouling/underwater coatings, coatings, paints containing biocide, etc., to achieve the effect of simple operation and high cost performance

Active Publication Date: 2021-01-29
三棵树(上海)新材料研究有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

How to combine the two points mentioned above to prepare a composite nanoemulsion with high hardness, good stain resistance, strong aging resistance, and excellent color retention has not yet been reported.

Method used

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  • Silicon dioxide/polyacrylate/polysiloxane composite emulsion as well as preparation method and application thereof
  • Silicon dioxide/polyacrylate/polysiloxane composite emulsion as well as preparation method and application thereof
  • Silicon dioxide/polyacrylate/polysiloxane composite emulsion as well as preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0032] A preparation method of silica-acrylate-polysiloxane composite emulsion mainly comprises the following steps:

[0033] 1. Modification of silica sol: After mixing water and silica sol evenly, add silane coupling agent, stir at 50°C and a stirring rate of 400rpm for 6h to obtain modified silica sol; the water, silica sol and silane coupling The mass ratio of the joint agent is 1:1:0.1;

[0034] 2. Preparation of silica / acrylate core-shell structure emulsion:

[0035] ① Mix 9 parts by mass of deionized water and 0.45 parts by mass of emulsifier evenly, then slowly add 28 parts by mass of acrylic acid monomer at a stirring rate of 300 rpm, and then continue stirring for 10 minutes to form a pre-emulsion one;

[0036] ② Mix 2.25 parts by mass of deionized water and 0.11 parts by mass of emulsifier evenly, then slowly add 7 parts by mass of acrylic acid monomer and 1 part by mass of functional monomer at a stirring speed of 300 rpm, and then continue stirring for 10 minutes...

Embodiment 2

[0051] A preparation method of silica-acrylate-polysiloxane composite emulsion mainly comprises the following steps:

[0052] 1. Modification of silica sol: After mixing water and silica sol evenly, add silane coupling agent, stir at 65°C and a stirring rate of 200rpm for 3 hours to obtain modified silica sol; the water, silica sol and silane coupling The mass ratio of the joint agent is 2:2:0.03

[0053] 2. Preparation of silica / acrylate core-shell structure emulsion:

[0054] ① Mix 18 parts by mass of deionized water and 2.5 parts by mass of emulsifier evenly, then slowly add 40 parts by mass of acrylic acid monomer at a stirring rate of 600 rpm, and then continue to form a pre-emulsion for 30 minutes;

[0055] ② Mix 4.5 parts by mass of deionized water and 0.23 parts by mass of emulsifier evenly, then slowly add 10 parts by mass of acrylic acid monomer and 3 parts by mass of functional monomer at a stirring rate of 600 rpm, and then continue stirring for 30 Minutes to for...

Embodiment 3

[0070] Add 25g of deionized water to 25g of acidic silica sol (solid content 40%), raise the temperature to 60°C, add 0.6g KH570 and keep stirring at 250rpm for 5h to obtain modified silica sol (solid content 20%).

[0071] Add 20g of water, 2g of S25 and 2g of FSL 707 into a 250ml four-neck flask, stir at 250rpm at room temperature, add 1.6g of acrylic acid, 45g of methyl methacrylate and 30g of butyl acrylate, adjust the stirring speed to 400rpm, and stir for 20min to obtain Uniform and stable pre-emulsion1.

[0072] Add 6g of water, 0.3g of S25, 0.4g of FSL 707 and 0.3g of N-10 into a 100ml four-neck flask, stir well at 250rpm at room temperature, then add 0.4g of acrylic acid, 2g of methylol acryloyl urea, and 1.5g of silicone Monomer UM-1770, 2g glycidyl methacrylate, 10g methyl methacrylate and 8g butyl acrylate, adjust the stirring speed to 400rpm, and stir for 20min to obtain a uniform and stable pre-emulsion 2.

[0073] Add 5g of water and 0.2g of sodium bicarbonate ...

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Abstract

The invention relates to a silicon dioxide / polyacrylate / polysiloxane composite emulsion as well as a preparation method and application thereof. The preparation method mainly comprises the steps of silica sol modification, preparation of silicon dioxide / acrylate core-shell structure emulsion and preparation of silicon dioxide / acrylate / polysiloxane composite emulsion. The preparation method comprises the following steps: firstly, modifying silica sol, then preparing a composite emulsion with a more stable silicon dioxide / acrylate system and a low gel rate (less than 0.5%) by utilizing a seed growth polymerization method, and introducing active groups such as amino and epoxy into acrylate, so that the composite emulsion can be effectively assembled and compounded with subsequently added polysiloxane nanoparticles. Therefore, the raspberry-shaped silicon dioxide / acrylate / polysiloxane organic-inorganic hybrid emulsion with excellent performance is prepared. A silica component in the particles of the emulsion provides hardness support; the acrylate provides a film-forming property; the polysiloxane provides weather resistance, color retention and stain resistance.

Description

technical field [0001] The invention relates to the field of preparation of monodisperse non-metallic nanometer materials, in particular to a silicon dioxide / polyacrylate / polysiloxane composite emulsion, a preparation method and an application thereof. Background technique [0002] Polyacrylate emulsion is a copolymer dispersed in water prepared mainly by emulsion polymerization of acrylic monomers. Coatings prepared from polyacrylate emulsions have good weather resistance, chemical resistance and stain resistance. Polyacrylate prepared by conventional emulsion polymerization is a branched random copolymer with only a single Tg point, so there are phenomena such as high brittleness at low temperature, stickiness and reduced hardness at high temperature, that is, hot sticky and cold brittle phenomenon. This fatal shortcoming limits the application of conventional polyacrylic acid emulsions in high-end coatings, so how to modify polyacrylic acid to improve its performance has ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G77/42C08F292/00C08F220/18C08F220/14C08F220/32C08F220/06C08F230/08C08F220/60C08F220/56C09D183/10C09D5/16
CPCC08G77/42C08F292/00C09D183/10C09D5/1675C08F220/1804C08F220/325C08F220/14C08F220/06C08F230/085C08F220/603C08F220/56
Inventor 李维亚强志华姜美佳付绍祥洪杰
Owner 三棵树(上海)新材料研究有限公司
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