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A kind of preparation method of aqueous polyacrylate emulsion

A technology of polyacrylate emulsion and acrylic acid monomer, which is applied in the direction of coating, etc., can solve the problems of affecting the shelf life, poor interface bonding performance, and the stability of the composite emulsion cannot be effectively guaranteed, so as to improve the shelf life and impact resistance. and anti-stone impact performance, improve the effect of interface bonding performance

Active Publication Date: 2020-11-24
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the polyurethane-polyacrylate composite emulsion is prepared by physical blending, the interfacial bonding performance of polyurethane and polyacrylate is poor, the stability of the obtained composite emulsion cannot be effectively guaranteed, and precipitation and stratification will occur. , affecting shelf life

Method used

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  • A kind of preparation method of aqueous polyacrylate emulsion
  • A kind of preparation method of aqueous polyacrylate emulsion

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] (1) Add 1.0 kg of acrylic acid monomer and 8.05 kg of glycolide monomer into the reactor, raise the temperature to 135 ° C, while stirring, add 0.009 kg of catalyst tin oxide to the reaction system, and stir for 2 hours to prepare Obtain a polyglycolide grafted acrylate oligomer;

[0016] (2) Add 30.17 kilograms of deionized water and 0.045 kilograms of octylphenol polyoxyethylene ether respectively to the oligomer obtained in step (1), raise the temperature to 65° C., and add 10 ml / min to the reaction system while stirring Speed ​​dripping 1.81 kilograms of mass percent concentration is that 5% ammonium persulfate solution initiates polymerization reaction, after dropwise addition, insulation reaction is 90 minutes, is 7.5 with the sodium carbonate solution regulation system pH value of 20% with mass percent concentration, Cool to room temperature and discharge to obtain a polyglycolide-modified polyacrylate emulsion.

Embodiment 2

[0018] (1) 1.0 kg of acrylic acid monomer and 32.21 kg of glycolide monomer were added to the reactor, the temperature was raised to 160° C., while stirring, 0.166 kg of catalyst tin dichloride was added to the reaction system, and the reaction was stirred for 0.5 hours, That is, a polyglycolide grafted acrylate oligomer is obtained;

[0019] (2) Add 55.35 kilograms of deionized water and 0.332 kilograms of octylphenyl polyoxyethylene ether respectively to the oligomer obtained in step (1), raise the temperature to 85° C., while stirring, add 20 ml / Add 4.98 kilograms of azobisisobutylamidine hydrochloride solution dropwise at a rate of 20% by mass at a speed of 1 minute to initiate the polymerization reaction. The pH value of the system was adjusted to 8.0 by disodium hydrogen solution, cooled to room temperature and discharged to obtain a polyglycolide-modified polyacrylate emulsion.

Embodiment 3

[0021] (1) 1.0 kg of acrylic acid monomer and 16.11 kg of glycolide monomer are added to the reactor, the temperature is raised to 147 ° C, while stirring, 0.051 kg of catalyst stannous octoate is added to the reaction system, and the reaction is stirred for 1.5 hours, namely A polyglycolide grafted acrylate oligomer is obtained;

[0022] (2) Add 38.02 kg of deionized water and 0.128 kg of nonylphenol polyoxyethylene ether to the oligomer obtained in step (1) respectively, raise the temperature to 75°C, and pour the mixture into the reaction system at 15 ml / min while stirring. Add 2.28 kilograms of azobisisobutylamidine hydrochloride solution dropwise at a speed of 15% by mass to initiate the polymerization reaction. The pH value of the solution was adjusted to 8.5, and the solution was cooled to room temperature and discharged to obtain a polyglycolide-modified polyacrylate emulsion.

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Abstract

The invention discloses a preparation method of a waterborne polyacrylate emulsion and belongs to the field of coatings. The preparation method comprises the steps: grafting a glycolide molecule on anacrylic monomer by a glycolide ring opening addition reaction to prepare a polyglycollide-modified acrylate monomer oligomer; then, adding deionized water and an emulsifying agent into the oligomer;adding an initiator solution for an emulsion polymerization reaction; and then preparing the waterborne polyacrylate emulsion. The preparation process is simple, conditions are easy to control, the prepared waterborne polyacrylate emulsion is good in storage stability and can have a wide application prospect in the field such as plastics and rubber, and a coating of the waterborne polyacrylate emulsion has excellent adhesion, impact resistance and stone crash resistance.

Description

technical field [0001] The invention belongs to the field of coatings, and in particular relates to a preparation method of an aqueous polyacrylate emulsion. Background technique [0002] Polyacrylate has the advantages of flexibility and elasticity, film formation, aging resistance, oil resistance, good adhesion and high transparency, so it is used for coating the surface of rubber and plastic products. At present, the vast majority of coatings used for rubber and plastic materials in my country are solvent-based polyacrylate coatings, which will release a large amount of volatile organic compounds (VOC) during coating, which not only causes environmental pollution, but also seriously endangers human health. Water-based polyacrylate emulsion is favored for its advantages of convenient construction and environmental protection. However, the acrylate coating after curing of waterborne polyacrylate emulsion has mechanical problems such as poor wear resistance, poor adhesion, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F299/04C08F2/30C08G63/08C08G63/85C09D155/00
CPCC08F2/30C08F299/0414C08F299/0492C08G63/08C08G63/823C09D155/005
Inventor 陈群姚超左士祥李霞章刘文杰周铭郭小平徐勤力岳晓峰
Owner CHANGZHOU UNIV
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