Water-based acrylic emulsion as well as preparation method and application thereof

A technology of water-based acrylic acid and methacrylic acid, applied in the direction of coating, etc., to achieve the effect of low film forming temperature, high hardness and good stability

Active Publication Date: 2020-11-17
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the problem that the water-based acrylic emulsion needs a large amount of film-forming aids in the prior art, to realize that the water-based wood paint has both hardness and connectivity, and to further improve the hardness of the paint film; and to overcome the water-based acrylic emulsion And the application stability of water-based wood paint, so that the emulsion and solvent can be better compatible

Method used

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  • Water-based acrylic emulsion as well as preparation method and application thereof
  • Water-based acrylic emulsion as well as preparation method and application thereof
  • Water-based acrylic emulsion as well as preparation method and application thereof

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preparation example Construction

[0040] In the present invention, the polyurethane macromonomer is prepared by the following method: 0.01-0.05wt% dibutyltin dilaurate, 50-70wt% glycol, 20-30wt% dibutyltin dilaurate, 20-30wt% Add the isocyanate into the reaction kettle, react at a reaction temperature of 80-90°C for 2-3 hours, and then add the mixture of 5-12wt% monohydric alcohol and 5-10wt% hydroxyethyl acrylate to the above-mentioned reaction kettle React in medium for 2-3 hours, cool down and discharge to obtain a polyurethane macromonomer, wherein the total amount of the reaction raw materials is the sum of the amounts of dibutyltin dilaurate, glycol, diisocyanate, monohydric alcohol and hydroxyethyl acrylate.

[0041] In the present invention, the water can be water of various hardnesses, commonly used tap water, well water, distilled water, purified water and deionized water can be used, preferably deionized water.

[0042] Preferably, the antifoaming agent is a polyether siloxane copolymer, for example...

Embodiment approach

[0053] According to a preferred embodiment of the present invention, a certain weight ratio of emulsifier, buffer, the first part of the initiator and water are heated and stirred in the reaction kettle, and the temperature is raised to 70-80° C. and stirred for 20 minutes to obtain a mixed solution, wherein , the reactor is equipped with a condenser and high-speed stirring.

[0054] According to the present invention, in step (2), the first part of methacrylic acid, the first part of hard monomer, modified SiO 2 The timing of introducing the particles and the second part of the initiator into the mixed solution is not particularly limited. Preferably, after the mixed solution in step (1) is heated to 70-80°C, the first part of methacrylic acid, the first part of hard monomer, the modified SiO 2 Particles and a second portion of initiator are introduced into the mixed liquor. In this preferred situation, it is beneficial to improve the particle size uniformity of the core la...

Embodiment 1

[0087] (1) The emulsifier, the buffer, the first part of the initiator and the deionized water are mixed in the reaction kettle for the first time, and the temperature is raised to 75° C. to obtain the mixed solution;

[0088] (2) the first part of methacrylic acid, the first part of hard monomer, modified SiO 2 Particles and the second part of the initiator are introduced into the mixed solution for 0.5 hours, and then incubated for 0.5 hours to obtain the first solution;

[0089] (3) The second part of methacrylic acid, the first part of soft monomer, functional monomer, the first part of crosslinking monomer, the second part of hard monomer, the first part of the first crosslinking agent, the first part of chain transfer agent, polyurethane The macromonomer and the third part of the initiator are introduced into the first solution for 2 hours, and then incubated for 0.5 hours to obtain the second solution;

[0090] (4) The third part of hard monomer, the second part of sof...

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Abstract

The invention relates to the technical field of water-based wood lacquer, in particular to water-based acrylic emulsion as well as a preparation method and application thereof. The water-based acrylicemulsion is prepared from the following components in parts by weight: 2-4 parts of methacrylic acid, 45-50 parts of a hard monomer, 19-30 parts of a soft monomer, 15-18 parts of a functional monomer, 5-8 parts of a crosslinking monomer, 0.5-1 part of an initiator, 2-6 parts of an emulsifier, 0.5-1 part of a buffer agent, 0.4-0.8 part of a chain transfer agent, 0.5-1 part of a first crosslinkingagent, 0.5-1 part of a second crosslinking agent, 3-5 parts of a pH regulator, 2-3.2 parts of a polyurethane macromonomer, 1-1.5 parts of modified SiO2 particles, 120-150 parts of water and 0.5-1 partof a defoamer, wherein the Tg of the hard monomer is more than 50 DEG C, and the Tg of the soft monomer is lower than 50 DEG C. The water-based acrylic emulsion has the characteristics of high hardness, good connectivity, good stability, good intermiscibility with an organic solvent and the like.

Description

technical field [0001] The invention relates to the technical field of water-based wood paint, in particular to a water-based acrylic emulsion and its preparation method and application. Background technique [0002] As my country's environmental requirements are getting higher and higher, the VOC (volatile organic compound) emissions in wood paints are also greatly restricted. Therefore, water-based wood paints have become a trend. [0003] Now most of the topcoats in water-based wood lacquers cannot be well unified in terms of connectivity and hardness. It shows that the connectivity is good but the hardness is not good, or the hardness is high but the connectivity is poor. Researchers have conducted a lot of research on this. Improvement work, but the effect is not obvious. [0004] During the use of water-based wood paint, it is usually necessary to add a high amount of coalescent to achieve better connectivity. At the same time, in the production process of acrylic em...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F285/00C08F220/14C08F220/18C08F220/58C08F220/40C09D151/00
CPCC08F285/00C09D151/003C08F220/14C08F220/1808C08F220/1804C08F220/58C08F220/40
Inventor 孟凯王旭朋宋延林张瑞
Owner INST OF CHEM CHINESE ACAD OF SCI
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