Preparation method and application of acrylate heterozygotic emulsion

A technology of acrylate and alkyl acrylate, applied in the field of preparation of acrylate hybrid emulsion, which can solve the problem of low hydroxyl value of hydroxyacrylate emulsion, high emulsifier content, poor emulsification ability of hydrophilic modified curing agent, etc. problems, to achieve the effect of good mechanical properties, dense coating structure and good comprehensive performance

Active Publication Date: 2010-07-28
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In view of the poor emulsification ability of the hydroxyl component of the water-based two-component polyurethane coatings to the hydrophilic modified curing agent, and the low hydroxy

Method used

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  • Preparation method and application of acrylate heterozygotic emulsion
  • Preparation method and application of acrylate heterozygotic emulsion
  • Preparation method and application of acrylate heterozygotic emulsion

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0069] The formula of acrylate hybrid emulsion (PAH, hydroxyl value=99mgKOH / g) is shown in Table 1:

[0070] Table 1

[0071]

[0072] Add 0.4 parts of emulsifier, 0.18 parts of buffer, and 46.3 parts of deionized water into the reactor, raise the temperature to 75°C, stir for 30 minutes, and dropwise add 0.1 parts of methacrylic acid, 1 part of butyl acrylate and 3 parts of methacrylic acid The mixed monomer of methyl ester, add dropwise the aqueous solution (weight fraction is 5%) that contains 0.02 part of initiator simultaneously, add dropwise in half an hour, treat that the emulsion is blue phase and stable half an hour, obtain seed emulsion, keep reaction system temperature at 80°C, then drop the first polar monomer mixture into the seed emulsion to prepare polymer latex particles P 1 , the composition of the first polar monomer mixture is 20.5 parts of methyl methacrylate, 2.5 parts of butyl acrylate, 1.4 parts of methacrylic acid and 2 parts of β-hydroxyethyl metha...

Embodiment 2

[0075] Using the acrylate hybrid emulsion prepared in Example 1, a waterborne two-component polyurethane coating (2K-WPU) formulation was prepared as shown in Table 2.

[0076] Table 2

[0077]

[0078] The preparation method is as follows: firstly add raw materials No. 2-7 into the stirring tank, disperse with a high-speed disperser for 30 minutes, then slowly add the PAH emulsion into the stirring tank, stir at 700 rpm for 60 minutes, and adjust the pH of the coating with ammonia water Value, when pH=8.0, filter the material, then add hydrophilic modified HDI curing agent to the filtered PAH emulsion, stir rapidly for 20 minutes, add water to dilute to the specified viscosity of 200cps, stand and filter, and the prepared water-based Two-component polyurethane coating with the following properties:

[0079] Appearance: milky white slightly transparent liquid, without mechanical impurities; pH=8.0; solid content 33%, viscosity 200cps.

[0080] Wood coating film performanc...

Embodiment 3

[0082] The monomer composition is butyl acrylate, methyl methacrylate, methacrylic acid and β-hydroxyethyl methacrylate, and the formula of acrylate hybrid emulsion is shown in Table 3:

[0083] table 3

[0084]

[0085] Add 0.75 parts of emulsifier, 0.2 parts of buffer, and 46.2 parts of deionized water into the reactor, raise the temperature to 75°C, stir for 30 minutes, and dropwise add 0.1 parts of methacrylic acid, 2 parts of butyl acrylate and 1 part of methacrylic acid Mixed monomers of methyl ester, add dropwise the aqueous solution (weight fraction is 5%) that contains 0.05 part of initiator (potassium persulfate) simultaneously, drop in half an hour, treat that emulsion is blue phase and stable 45 minutes, obtain seed emulsion, keep The temperature of the reaction system is 78°C, and then the first polar monomer mixture is added dropwise to the seed emulsion at a uniform speed to prepare polymer latex particles P 1 , the monomer mixture is composed of 10 parts of...

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Abstract

The invention discloses a preparation method and an application of an acrylate heterozygotic emulsion. In the invention, the acrylate heterozygotic emulsion is synthesized by adopting a seed emulsion polymerization process and combining a process of instantly neutralizing and segmentally adding polar monomers. The acrylate heterozygotic emulsion comprises macroparticles consisting of polymers P2 rich in hydroxyl groups on a surface layer and microparticles consisting of polymers P1 rich in carboxylate on the surface layer. Compared with a conventional hydroxy acrylate emulsion, the acrylate heterozygotic emulsion has smaller mean grain size and wider grain size distribution on emulsion particles. The acrylate heterozygotic emulsion can be adopted to prepare aqueous bi-component polyurethane wood coatings, and a coating layer of the coating has excellent property of resisting water and solvents, high crosslinking density and hardness, good mechanical property, scratching resistance and wear resistance. The acrylate heterozygotic emulsion has compact coating structure, high glossiness and better combination property, and not only can be applied to high-grade wood coatings, but also can be applied to automotive refinish paint, metallic anti-corrosion paint, other industrial protective paint, and the like.

Description

technical field [0001] The invention relates to a preparation method of acrylate hybrid emulsion and application thereof, in particular to a preparation method of acrylate hybrid emulsion and its application in preparing water-based two-component polyurethane wood coatings; Background technique [0002] At present, the industrial coating and civil decoration industries have put forward higher requirements for the performance, safety, energy saving and environmental protection of coatings. Water-based two-component acrylate polyurethane coatings are high-quality coatings with both performance and environmental protection. It not only has solvent Type two-component polyurethane coating has the advantages of high hardness, good media resistance, low film forming temperature and strong adhesion, and low volatile organic compound (VOC) content. Broad application prospects. [0003] The water-based two-component acrylate polyurethane coating is composed of a hydrophilic modified ...

Claims

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Application Information

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IPC IPC(8): C08F220/14C08F220/18C08F220/28C08F220/06C08F2/30C08F2/26C09D175/04
Inventor 瞿金清罗春晖陈焕钦朱延安曹树潮
Owner SOUTH CHINA UNIV OF TECH
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