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Organosilicon modified hydroxyl polyacrylate dispersion and preparation method and application thereof

A hydroxy polyacrylate and organosilicon technology, applied in the field of coatings, can solve the problems of poor milky white appearance, small molecular weight, complicated process, etc.

Active Publication Date: 2022-03-04
CARPOLY CHEM GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing hydroxypropyl dispersion still has problems such as low solid content, poor storage stability, milky white appearance and poor appearance, and the paint film prepared after mixing with water-based polyisocyanate curing agent has problems such as slow drying speed and low hardness.
The reason for the above problems is that the polymer molecule of the hydroxypropyl dispersion has a linear structure and the molecular weight is small. The viscosity of the polymer will increase significantly, causing the prepolymer to be unable to disperse below the boiling point of water (100°C), and in severe cases, the prepolymer will gel
In order to realize the dispersion of high-molecular-weight prepolymers, related technologies use high-pressure equipment to achieve water dispersion above 100°C, but this method is complex and costly; at the same time, the paint film of the two-component water-based polyurethane coating still has a slow drying speed , low hardness, etc., to solve this problem, there is also a technology to promote the reaction between the dispersion polymer and the water-based polyisocyanate curing agent by wrapping a metal ion catalyst inside the water-based dispersion, but this method has no obvious effect on improving the drying speed of the paint film At the same time, this method does not fundamentally solve the problems of low solid content, poor storage stability, and poor appearance of milky white appearance caused by the small molecular weight and linear structure of the hydroxypolyacrylate dispersion prepolymer, nor can it solve other problems. The paint film produced after mixing with water-based polyisocyanate curing agent has the problem of low hardness. The most serious problem is that the metal catalyst introduced by this method will also bring heavy metal pollution; Dispersion is used to solve the problem of slow drying and low hardness of the two-component polyurethane coating film, but in the preparation process of this process, the VOC is too high after the silane coupling agent is hydrolyzed, and the crosslinking density of the two-component water-based polyurethane coating film is low , and then make the performance of the coating film worse

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0083] In this example, a silicone-modified hydroxyl polyacrylate dispersion was prepared:

[0084] S1. In parts by mass, 12.7 parts of acrylic acid, 9 parts of methyl methacrylate, 20 parts of styrene, 8.7 parts of butyl acrylate, 19 parts of hydroxyethyl methacrylate and 1.5 parts of di-tert-amyl peroxide Mix evenly to form a monomer mixture for subsequent use;

[0085] S2. Add 30 parts of glycidyl tert-carbonate monomer and 3.4 parts of β-(3,4-epoxycyclohexyl) ethyl Trimethoxysilane, mix and stir and heat. When the temperature reaches 145°C, start to drop the monomer mixture obtained in step S1. After 4 hours, stir and keep warm for 30 minutes. Cool down to 80°C and add 9.4 parts of isophorone. Diisocyanate, NCO / OH is 0.29:1, react for 20 minutes, use di-n-butylamine titration test - after the NCO content is 1.5%, the test viscosity is 5000mPa·s (80°C), add 3.4 parts of triethylamine, and stir for 5 minutes Add 10 parts of deionized water, react for 10 minutes, then add 1...

Embodiment 2

[0088] This embodiment has prepared a kind of waterborne two-component polyurethane coating:

[0089] Add 62 parts of the silicone-modified hydroxy polyacrylate dispersion in Example 1 into the stirring tank, and the rotation speed is 700 rpm, and pre- After mixing, add to the emulsion, add 0.2 part of defoamer, 0.8 part of thickener, 0.2 part of wetting agent, 0.3 part of neutralizing agent in sequence, disperse for 10-30 minutes, and filter out the material to obtain the main agent of water-based two-component polyurethane coating .

[0090] During construction, add 22.8 parts of water-based polyisocyanate curing agent to 100 parts of the main agent of the above-mentioned water-based two-component polyurethane coating, and stir for 5-8 minutes to obtain the water-based two-component polyurethane coating.

[0091] The molar ratio of NCO groups in the curing agent to OH groups in the main agent is 1.8:1.

[0092] The defoamer is TEGO-800;

[0093] The thickener is RM-8W;

...

Embodiment 3

[0098] In this example, a silicone-modified hydroxyl polyacrylate dispersion was prepared:

[0099] S1. In parts by mass, 15 parts of methacrylic acid, 15 parts of methyl methacrylate, 15.1 parts of styrene, 6 parts of butyl acrylate, 20 parts of hydroxyethyl acrylate, 2 parts of di-tert-amyl peroxide Mix evenly to form a monomer mixture for subsequent use;

[0100] S2. Add 30 parts of 4-tert-butyl glycidyl benzoate monomer and 2.8 parts of γ-glycidyl ether propyl trimethoxy in a four-necked flask equipped with a thermometer, condenser tube, stirring paddle and constant pressure dropping funnel base silane, mixed and stirred and heated. When the temperature reached 140°C, the monomer mixture obtained in step S1 was added dropwise. After 4.5 hours, the drop was completed. Isocyanate, NCO / OH is 0.23:1, react for 20min, use di-n-butylamine titration test-after the NCO content is 1.3%, the test viscosity is 4500mPa·s (80°C), add 3.2 parts of triethylamine, stir for 3min and then ...

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Abstract

The invention discloses an organic silicon modified hydroxyl polyacrylate dispersion as well as a preparation method and application thereof. The organic silicon modified hydroxyl polyacrylate dispersion is prepared from the following raw materials: a monomer mixture, an organic silicon monomer, a reactive diluent and isocyanate, in the preparation raw materials, the solid content of the organic silicon modified hydroxyl polyacrylate dispersion is 42 to 46 percent; the content of small molecular alcohol in the organic silicon modified hydroxyl polyacrylate dispersion is 1t; 0.1%; the particle size of the organic silicon modified hydroxyl polyacrylate dispersion is 1t; the wavelength is 110nm. A paint film of a water-based two-component polyurethane coating prepared from the organic silicon modified hydroxyl polyacrylate dispersion has the characteristics of high drying speed, high hardness and good chemical resistance.

Description

technical field [0001] The invention belongs to the technical field of coatings, and in particular relates to an organosilicon-modified hydroxyl polyacrylate dispersion and a preparation method and application thereof. Background technique [0002] Coatings are substances coated on the surface of objects to protect, decorate and endow them with certain properties. Most of the existing wood coatings are organic solvent-based coatings, which contain more than 50% of organic solvents. Most of these organic solvents It is flammable and explosive, and will volatilize into the atmosphere during the construction process to pollute the environment and damage human health. Water-based wood coatings do not contain organic solvents, therefore, water-based wood coatings are the development trend of coatings. Waterborne wood coatings include one-component and two-component water-based wood coatings. Among them, the water resistance, chemical resistance and hardness of one-component wat...

Claims

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Application Information

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IPC IPC(8): C09D175/04C08G18/62
CPCC09D175/04C08G18/6229
Inventor 段晓俊彭刚阳罗建华朱延安
Owner CARPOLY CHEM GRP
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