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Core-shell structure nanoparticle and preparation method of hardened water-based acrylic resin coating

A technology of water-based acrylic and core-shell structure, applied in the direction of coating, etc., can solve the problems of unstable resin performance in the polymerization process, lack of storage stability, cumbersome process, etc., achieve excellent weather resistance and light transmittance, and improve dispersion stability , good water resistance effect

Active Publication Date: 2020-12-04
科思创树脂制造(佛山)有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

To sum up, it can be seen that adding nanoparticles is a simple and effective way to improve the hardness of water-based acrylic paint film, but the storage stability of nanoparticles modified by simple silane coupling agent is lacking, and the method of in-situ polymerization can solve the problem of particle hardness. The problem of storage stability, but the instability of the polymerization process has a great impact on the performance of the resin, and the process is relatively cumbersome, so a kind of storage stability is developed, which is highly compatible with the resin matrix, and can simply and effectively improve the single group Particles that separate the hardness of water-based acrylic paints need to be solved urgently, which is of great significance for the preparation of high-hardness one-component water-based varnishes

Method used

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  • Core-shell structure nanoparticle and preparation method of hardened water-based acrylic resin coating
  • Core-shell structure nanoparticle and preparation method of hardened water-based acrylic resin coating
  • Core-shell structure nanoparticle and preparation method of hardened water-based acrylic resin coating

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preparation example Construction

[0038] A preparation method for core-shell structure nanoparticles, characterized in that, comprising the following steps:

[0039] S1, put 1 ~ 5g nano-SiO 2 Add 150-300ml of organic solvent, ultrasonically disperse for 1 hour, put the mixture into a three-necked flask equipped with a condenser, an electric stirrer and a thermometer, raise the temperature to 40-80% ℃, and control the stirring rate at 300-600r / min After stirring for 1-2 hours, add 1-5ml of silane coupling agent, and after reacting for 6-12 hours, filter the solution to obtain nano-SiO modified by silane coupling agent. 2 Precipitate, after washing, vacuum drying and grinding, the modified nano-SiO 2 particle;

[0040] S2. Take 1-5g of nano-SiO modified by silane coupling agent in step 1). 2 Added to a condensing tube, an electric stirrer and a thermometer while feeding N 2 In a four-necked flask, heat up to 60-100% °C, and control the stirring rate at 200-600r / min. After stirring for 1-2 hours, add polymer ...

Embodiment 1

[0062] 1g nano-SiO 2 and 200ml of toluene solvent into a three-necked flask equipped with a condenser, an electric stirrer and a thermometer. After ultrasonic dispersion for 1h, the flask was heated in an oil bath, and the temperature was raised to 70°C. The stirring rate was controlled at 400r / min, and stirred for 2 Hour. Add 1ml of silane coupling agent isocyanate propyltriethoxysilane and 5ml of deionized water into a four-necked flask equipped with a condenser tube, an electric stirrer and a thermometer while feeding N2, and raise the temperature to 70°C , the stirring rate was controlled at 300r / min, and the reaction was carried out for 8 hours to obtain a solution modified by the silane coupling agent. Afterwards, 1 ml of deionized water and acetic acid were added to the obtained solution to adjust the pH to 3, and the solution was ultrasonically oscillated for 1 hour. Add the hydrolyzed silane coupling agent to the SiO 2 In a three-necked flask, the reaction was conti...

Embodiment 2

[0076] Weigh 1.0g of SiO 2 Add it into a three-necked flask, add 150ml of toluene solution, stir at a speed of 300 rpm, and heat in an oil bath at 75°C for 0.5h. At the same time, weigh 1.0g of silane coupling agent γ-(methacryloyloxy)propyltrimethoxy and 1.0g of deionized water into the sample bottle, drop acetic acid to adjust the pH to about 3, put the sample bottle Ultrasonic hydrolysis in an ultrasonic water bath for 1 h. Then the hydrolyzed silane coupling agent was added into the three-necked flask, and the rotation speed was raised to 500 rpm for 6 hours of reaction. After the reaction, the mixture was suction-filtered to obtain a white powder solid, which was washed three times with ethanol solution, dried in an oven at 50°C for 24 hours, and then taken out for use.

[0077] 1g modified nano-SiO 2and 180ml of toluene solvent into a three-necked flask equipped with a condenser, an electric stirrer and a thermometer. After ultrasonic dispersion for 1h, the flask was ...

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Abstract

The invention discloses a core-shell structure nanoparticle and a preparation method of a hardened water-based acrylic resin coating. The preparation method comprises the following steps: preparing silane coupling agent modified nano SiO2, and grafting a polymer on the surface of the modified nano SiO2 to react, thereby obtaining the nano SiO2 composite particle with the core-shell structure. Thewater-based acrylic resin is obtained by emulsion polymerization of monomers such as acrylic acid and acrylic ester and an initiator. The prepared coating comprises the following components in parts by weight: 70-90 parts of water-based acrylic resin, 1-20 parts of deionized water, 0.5-10 parts of a coalescing agent, 0.1-3 parts of a wetting dispersant, 0.1-3 parts of a leveling agent, 0.1-5 partsof a thickener, 0.05-3 parts of an antifoaming agent and 1-10 parts of core-shell nanoparticles. The single-component water-based acrylic resin coating disclosed by the invention is full in paint film, low in VOC content and excellent in adhesive force, glossiness and impact resistance, and meets the performance requirements of the water-based paint coating industry, and the hardness reaches 2H or above.

Description

technical field [0001] The invention belongs to the technical field of coatings, in particular to a preparation method of core-shell structure nanoparticles and a hardened water-based acrylic resin coating, and belongs to the synthesis of hardened nano-composite particles and the preparation method of the high-hardness single-component water-based varnish. Background technique [0002] In recent years, due to the increasing awareness of environmental protection, water-based coatings have ushered in an era of rapid development. Although water-based coatings are superior to traditional paints in terms of environmental performance, in terms of physical properties, water-based coatings have defects such as difficult construction, poor water resistance, easy peeling, poor fullness, and poor hardness. The one-component water-based varnishes currently on the market The main advantages of the produced products are good environmental protection and low price. The fatal disadvantages ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D133/08C09D7/65C09D7/62C09D125/14C08F220/18C08F220/14C08F220/06C08F212/08C08F292/00
CPCC08F212/08C08F292/00C08K2201/011C08L2207/53C09D125/14C09D133/08C09D7/62C09D7/65C09D7/70C08F220/1802C08L51/10C08K9/10C08K3/36C08F220/1804C08F220/14C08F220/06
Inventor 袁智成陈龙孙俊芬凌聪
Owner 科思创树脂制造(佛山)有限公司
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