Epoxy-acrylate composite emulsion and preparation method therefor

A technology of acrylate and composite emulsion, applied in coating and other directions, can solve the problems of waterborne epoxy resin stability and corrosion resistance being difficult to take into account at the same time, short storage period, low epoxy resin content, etc. Chemical application, easy operation, solving the effect of stability and corrosion resistance

Active Publication Date: 2017-02-22
HUBEI JIAJI SYNTHESIS MATERIALS CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the hydrophobicity of epoxy resins, it is difficult to prepare epoxy-acrylate composite emulsions with high epoxy resin content and stability under the conditions of emulsion polymerization.
On the other hand, waterborne epoxy resins have the difficulty of balancing stability and corrosion resistance at the same time, and it is difficult to achieve one-component self-crosslinking
[0003] In general, there are three main problems in epoxy-acrylate composite emulsion: (1) low content of epoxy resin; (2) short storage period; (3) inability to self-crosslink with one component at room temperature

Method used

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  • Epoxy-acrylate composite emulsion and preparation method therefor
  • Epoxy-acrylate composite emulsion and preparation method therefor
  • Epoxy-acrylate composite emulsion and preparation method therefor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] A kind of preparation method of epoxy-acrylate composite emulsion is characterized in that, the steps that comprise are as follows:

[0065] A. Preparation of modified epoxy resin:

[0066] A1. In a four-necked flask equipped with a stirrer, a reflux condenser, and a thermometer, add 50g epoxy resin and 0.1g hydroquinone, stir evenly, and obtain the still material;

[0067] A2. take by weighing 0.25g catalyst and 8.36g of acrylic acid, dissolve catalyst into acrylic acid, obtain the acrylic acid monomer that is dissolved with catalyst;

[0068] A3. When the temperature of the kettle material in step A1 rises to 75°C, evenly add the acrylic acid monomer in step A2 dropwise, the control time is within 30min, and the temperature is kept at 75°C for 30min, then the temperature is raised to 80°C, and the reaction is kept for 4h until the acid value is less than 0.03mg / g, obtain modified epoxy resin;

[0069] B. Emulsion polymerization:

[0070] B1. Weigh 7.2g of modified ...

Embodiment 2

[0080] A kind of preparation method of epoxy-acrylate composite emulsion is characterized in that, the steps that comprise are as follows:

[0081] A. Preparation of modified epoxy resin:

[0082] A1. In a four-necked flask equipped with a stirrer, a reflux condenser, and a thermometer, add 50g epoxy resin and 0.1g hydroquinone, stir evenly, and obtain the still material;

[0083] A2. take by weighing 0.25g catalyst and 8.36g of acrylic acid, dissolve catalyst into acrylic acid, obtain the acrylic acid monomer that is dissolved with catalyst;

[0084] A3. When the temperature of the kettle material in step A1 rises to 75°C, evenly add the acrylic acid monomer in step A2 dropwise, the control time is within 30min, and the temperature is kept at 75°C for 30min, then the temperature is raised to 80°C, and the reaction is kept for 4h until the acid value is less than 0.03mg / g, obtain modified epoxy resin;

[0085] B. Emulsion polymerization:

[0086] B1. Weigh 6.75g of modified...

Embodiment 3

[0095] A kind of preparation method of epoxy-acrylate composite emulsion is characterized in that, the steps that comprise are as follows:

[0096] A. Preparation of modified epoxy resin:

[0097] A1. In a four-necked flask equipped with a stirrer, a reflux condenser, and a thermometer, add 50g epoxy resin and 0.1g hydroquinone, stir evenly, and obtain the still material;

[0098] A2. Weigh 0.25g of catalyst and 8.36g of acrylic acid, dissolve the catalyst into acrylic acid, n(E-44):n(AA)=1:1.5-1:0.5, and obtain the acrylic acid monomer dissolved with catalyst;

[0099] A3. When the temperature of the kettle material in step A1 rises to 75°C, evenly add the acrylic acid monomer in step A2 dropwise, the control time is within 30min, and the temperature is kept at 75°C for 30min, then the temperature is raised to 80°C, and the reaction is kept for 4h until the acid value is less than 0.03mg / g, obtain modified epoxy resin;

[0100] B. Emulsion polymerization:

[0101] B1. Weig...

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PUM

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Abstract

The invention discloses a preparation method for an epoxy-acrylate composite emulsion. According to the preparation method, in step one, an acrylic monomer containing active hydrogen is adopted to modify epoxy resin, and the reaction ratio of the active hydrogen to epoxy groups is regulated and controlled, so that chain segments of the modified epoxy resin have double bonds, and part of the epoxy groups are reserved; and in step two, a high-epoxy-resin-content mono-component self-crosslinked stable aqueous epoxy-acrylate composite emulsion with an epoxy group acrylate polymer (core)-'inert' polyacrylate (intermediate layer)-carboxyl-containing (amino)acrylate polymer (shell) structure is prepared by adopting a core-shell emulsion polymerization method. The preparation method provided by the invention is simple in operation, and the problem that giving consideration to both the stability and the corrosion resistance of aqueous epoxy resin simultaneously is difficult is effectively solved.

Description

technical field [0001] The invention belongs to the field of synthesis of organic polymer materials, and in particular relates to an epoxy-acrylate composite emulsion and a preparation method thereof. Background technique [0002] Epoxy resin coating is a kind of coating that is widely used, but with the increasingly stringent environmental protection regulations, the application of solvent-based epoxy resin coating is more and more restricted. Many researchers at home and abroad have tried to modify solvent-based epoxy resins into water-based epoxy resins by mechanical methods, adding emulsifiers, and grafting methods. However, water-based coatings prepared from a single type of resin cannot compete with solvent-based coatings in terms of performance. Epoxy resin-acrylate (epoxy-acrylate) composite emulsion combines the advantages of epoxy resin and acrylate resin, and is currently a research hotspot in waterborne epoxy resin coatings. However, due to the hydrophobicity of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/10C08F220/14C08F220/18C08F220/06C08G59/17C09D151/08
CPCC08F283/105C08G59/1466C09D151/08C08F220/1804
Inventor 张凯张智力
Owner HUBEI JIAJI SYNTHESIS MATERIALS CO LTD
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