Organosilicon modified hydroxyl polyacrylate dispersion as well as preparation method and application thereof

A technology of hydroxyl polyacrylate and acrylate, which is applied in the direction of polyurea/polyurethane coatings, coatings, anti-corrosion coatings, etc., can solve the problems of poor coating film performance and reduce the crosslinking density of two-component waterborne polyurethane coating films, etc. Achieve strong storage stability, ensure storage stability, and maintain stable particle size

Active Publication Date: 2022-04-12
CARPOLY CHEM GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the use of silicone modification is also easy to release small molecule alcohol, which belongs to VOC, and the hydroxyl group of small molecule alcohol is monofunctional, and its reaction with curing agent as an end-capping agent will reduce the crosslinking density of two-component waterborne polyurethane coating film , thereby deteriorating the properties of the coating film

Method used

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  • Organosilicon modified hydroxyl polyacrylate dispersion as well as preparation method and application thereof
  • Organosilicon modified hydroxyl polyacrylate dispersion as well as preparation method and application thereof
  • Organosilicon modified hydroxyl polyacrylate dispersion as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] A silicone-modified hydroxyl polyacrylate dispersion 1, which is prepared by the following steps:

[0069] S1. In parts by mass, 11.7 parts of acrylic acid, 8 parts of methyl methacrylate, 18 parts of styrene, 11.1 parts of butyl acrylate, 19.5 parts of hydroxyethyl methacrylate, 2.7 parts of vinyltriethoxysilane 1.6 parts of di-tert-amyl peroxide are mixed evenly to form mixed solution A, which is set aside;

[0070] S2. Add 30 parts of glycidyl tert-carbonic acid ester monomer into a four-necked flask equipped with a thermometer, condenser, stirring paddle and constant pressure dropping funnel, mix and heat, and start to add the mixture dropwise when the temperature reaches 145°C A. After 4 hours of dropping, stir and keep warm for 30 minutes after dropping, cool down to 80°C, add 10.3 parts of isophorone diisocyanate, NCO / OH is 0.33, react for 20 minutes, and use di-n-butylamine titration test-NCO After the mass content of 1.9%, the test viscosity is 4750mPa s80 ℃),...

Embodiment 2

[0088] A silicone-modified hydroxyl polyacrylate dispersion 2, which is prepared by the following steps:

[0089] S1. In parts by mass, 14 parts of methacrylic acid, 18.1 parts of methyl methacrylate, 9.5 parts of styrene, 8 parts of butyl acrylate, 20 parts of hydroxyethyl acrylate, 1.7 parts of vinyltrimethoxysilane, 2 parts of di-tert-amyl peroxide are mixed evenly to form mixed liquid A for later use;

[0090] S2. Add 30 parts of 4-tert-butyl glycidyl benzoate monomer into a four-necked flask equipped with a thermometer, condenser, stirring paddle and constant pressure dropping funnel, mix and heat, when the temperature reaches 140°C Start to add the mixed solution A dropwise, and finish dropping in 4.5 hours. After dropping, stir and keep warm for 30 minutes, cool down to 80°C, add 6.5 parts of hexamethylene diisocyanate, NCO / OH is 0.26, react for 20 minutes, use di-n-butylamine Method titration test-the mass content of NCO is 1.6%, and the test viscosity is 4760mPa·s (8...

Embodiment 3

[0107] A silicone-modified hydroxyl polyacrylate dispersion 3, which is prepared by the following steps:

[0108] S1. In parts by mass, 12 parts of acrylic acid, 16 parts of methyl methacrylate, 13.2 parts of styrene, 7 parts of butyl acrylate, 21.5 parts of hydroxypropyl methacrylate, 2.6 parts of vinyl tri(2-methyl Oxyethoxy) silane and 2.3 parts of di-tert-amyl peroxide are mixed uniformly to form mixed solution A for subsequent use;

[0109] S2. Add 29 parts of glycidyl tert-carbonic acid monomer into a four-necked flask equipped with a thermometer, condenser, stirring paddle and constant pressure dropping funnel, mix and stir and heat, and start adding the mixture dropwise when the temperature reaches 150°C A. After 5 hours of dropping, stir and keep warm for 20 minutes after dropping, cool down to 75°C, add 5.5 parts of toluene diisocyanate, NCO / OH is 0.21, react for 15 minutes, use di-n-butylamine titration test - NCO content is 1.3 After %, the test viscosity is 5000m...

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Abstract

The invention belongs to the technical field of polyurethane coatings, and discloses an organic silicon modified hydroxyl polyacrylate dispersion as well as a preparation method and application thereof. The preparation method comprises the following steps: S1, mixing an acrylic monomer, an acrylate monomer, a vinyl monomer, an acrylate derivative monomer, an organic silicon monomer and an initiator to form a mixed solution A; s2, taking a reactive diluent, heating, dropwise adding the mixed solution A, and keeping the temperature; cooling, adding an isocyanate bridging agent, controlling the mass content of-NCO, and reacting to obtain a prepolymer; s3, adding a neutralizer into the prepolymer, adding water for dispersion, and filtering to obtain the product, the organic silicon monomer contains double bonds and does not contain epoxy groups. The organic silicon modified hydroxyl polyacrylate dispersoid prepared by the preparation method disclosed by the invention is low in small molecule alcohol content, high in storage stability and particularly excellent in high-temperature-resistant storage property; and a paint film prepared by using the paint is high in drying speed and high in hardness.

Description

technical field [0001] The invention belongs to the technical field of polyurethane coatings, and in particular relates to an organosilicon-modified hydroxyl polyacrylate dispersion and a preparation method and application thereof. Background technique [0002] Today, the surfaces of many objects need to be protected, decorated and endowed with special functions using coatings. Most of the existing wood coatings are solvent-based coatings, which contain more than 50% organic solvents. These solvents will volatilize into the atmosphere during the construction process to pollute the environment and damage human health, and the organic solvents themselves will bring safety hazards. Therefore, water-based wood coatings are the development trend of international coatings. Water-based wood coatings include one-component and two-component water-based wood coatings. Among them, the water resistance, chemical resistance and hardness of one-component water-based wood coatings are fa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/10C08G18/62C08F220/20C08F220/06C08F220/14C08F212/08C08F220/18C08F230/08C09D175/04C09D5/08
CPCY02E60/10
Inventor 段晓俊彭刚阳罗建华朱延安
Owner CARPOLY CHEM GRP
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