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Organosilicon modified silica sol/polyacrylate composite emulsion and its preparation method

A technology of polyacrylate and composite emulsion, applied in the direction of coating, etc., can solve the problems of serious whitening and foaming of the coating film, poor water resistance and solvent resistance of the coating film, and achieve enhanced water resistance, good water resistance and repeatability good effect

Inactive Publication Date: 2012-10-17
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the water resistance and solvent resistance of the coating film are poor: the coating film will be seriously whitened and blistered after soaking in water for one day, and the solvent wiping resistance can only pass 80 MEK tests

Method used

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  • Organosilicon modified silica sol/polyacrylate composite emulsion and its preparation method
  • Organosilicon modified silica sol/polyacrylate composite emulsion and its preparation method
  • Organosilicon modified silica sol/polyacrylate composite emulsion and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Add 10 g of isopropanol and 0.84 g of Y-(methacryloyloxy)propyltrimethoxysilane to 35 g of silica sol, stir and react at 60° C. for 8 h to obtain modified silica sol.

[0044] Add 2g of deionized water, 0.08g of PEO-10 ​​and T-80 (mass ratio: 2:1) into the jar, after dissolving evenly, add 3.8g of core layer mixed monomer methyl acrylate dropwise within 5min , butyl acrylate (mass ratio 3:1) and methacrylic acid, after the dropwise addition, stir with a magnetic stirrer at a speed of 1000 rpm for 25 minutes, and then stir at a speed of 500 rpm for 8 minutes to obtain a pre-emulsified nuclear monomer.

[0045] Add 12g of deionized water, 0.3g of PEO-10 ​​and T-80 (mass ratio: 2:1) into the jar, dissolve evenly, add 20g of acrylate monomer methyl acrylate to the shell at a constant speed within 20min ester, butyl acrylate (mass ratio 3:1), methacrylic acid, hydroxyethyl acrylate and N-methylolacrylamide, after the dropwise addition, stir with a magnetic stirrer at a speed...

Embodiment 2

[0049] Add 15g of ethylene glycol and 1.20g of γ-glycidyloxypropyltrimethoxysilane to 40g of silica sol, stir and react at 25°C for 12h to obtain modified silica sol.

[0050] Add 6g of deionized water, 0.45g of DNS-86 and OP-10 (mass ratio: 3:1) into the jar, after dissolving evenly, add 12g of core layer mixed monomer methyl methacrylate dropwise within 10min ester, butyl acrylate (mass ratio 2:1) and acrylic acid, after the dropwise addition, stir with a magnetic stirrer at a speed of 2000rpm for 20min, and then stir at a speed of 800rpm for 10min to obtain a pre-emulsified nuclear monomer.

[0051] Add 16g of deionized water, 1.1g of DNS-86 and OP-10 (mass ratio: 3:1) into the jar, after dissolving evenly, add 55g of acrylate monomer methyl Methyl acrylate, butyl acrylate (mass ratio is 2:1), butyl methacrylate, N-methylolacrylamide and hydroxyethyl methacrylate, after the dropwise addition, use a magnetic stirrer at a speed of 1500rpm Stir for 20 minutes, then stir for 7...

Embodiment 3

[0055] Add 30 g of ethanol and 3.20 g of vinyltriethoxysilane to 75 g of silica sol, and stir and react at 70° C. for 18 hours to obtain modified silica sol.

[0056] Add 3g of deionized water, 0.1g of PEO-10 ​​and T-80 (mass ratio 3:1) into the jar, after dissolving evenly, add 5g of the core layer mixed monomer methyl methacrylate dropwise within 10min ester, butyl acrylate (mass ratio 2:1) and methacrylic acid, after the dropwise addition, stir with a magnetic stirrer at a speed of 1500rpm for 15min, and then stir at a speed of 500rpm for 5min to obtain a pre-emulsified nuclear monomer .

[0057] Add 8g of deionized water, 0.5g of PEO-10 ​​and T-80 (mass ratio: 3:1) into the jar, after dissolving evenly, add 25g of acrylate monomer methyl Methyl acrylate, butyl acrylate (mass ratio is 2:1), methacrylic acid, butyl methacrylate and N-methylolacrylamide, after the dropwise addition, stir with a magnetic stirrer at a speed of 1500rpm for 20min, Then stir at a speed of 500rpm...

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Abstract

The invention discloses an organosilicon modified silica sol / polyacrylate composite emulsion and its preparation method. The emulsion comprises the following raw materials, by mass, 30-55 parts of deionized water, 20-65 parts of a modified silica sol, 2-15 parts of a core acrylate monomer, 20-60 parts of a shell acrylate monomer, 0.1-3.0 parts of organosilicon, 0.1-2.5 parts of an emulsifier, 0.02-1.5 parts of an initiator, and 0.01-2.0 parts of sodium bicarbonate, wherein the Si (by SiO2) content in the organosilicon modified silica sol / polyacrylate composite emulsion is 15-25% by mass. The emulsion which has an excellent appearance is a white emulsion with obvious blue lights. A coat of the emulsion is transparent and smooth, and has a hardness reaching 5-6H and an adhesion being 0-1 level. The coat has an excellent water resistance, so the coat does not have whitening and foaming phenomena after immersed in water for 7-10 days; the coat has no changes after resisting neutral salt fog for 15-20 days; and the solvent wiping resistance of the coat can pass an MEK test 180-200 times.

Description

technical field [0001] The invention relates to a water-based paint, in particular to an organosilicon-modified high-silicon-content silica sol / polyacrylate composite emulsion and a preparation method thereof. Hybrid nano coatings with physical advantages. technical background [0002] With the rapid development of my country's national economy, and people's increasing awareness of environmental protection, non-toxic, tasteless and low-VOC or even "zero VOC" environmentally friendly coatings are becoming more and more popular. At the same time, the concept of "low-carbon environmental protection" It has become more and more popular, and it has also laid a foundation for the development of environmentally friendly coatings. The water-based resin is an ideal method to reduce VOC emissions. Water-based coatings use water instead of organic solvents. They are safe and non-toxic during production and use, and can meet the needs of energy saving, emission reduction, recycling and ...

Claims

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Application Information

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IPC IPC(8): C08F292/00C08F220/14C08F220/18C08F220/06C08F220/28C08F220/58C08F230/06C08F2/26C08F2/30C09D151/10
Inventor 皮丕辉张佼如文秀芳蔡智奇徐守萍程江杨卓如
Owner SOUTH CHINA UNIV OF TECH
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