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Method for polymerizing water-borne acrylate coating

A technology of water-based acrylate and polymerization method, applied in coating and other directions, can solve the problems of complex process, poor emulsion stability, short storage period, etc., and achieve the effect of simplifying polymerization process, improving water resistance, and improving cross-linking degree

Active Publication Date: 2012-09-26
ANHUI JINDUN PAINT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although common unsaturated organosiloxanes such as vinyltrimethoxysilane, vinyltriethoxysilane, and vinyltris(β-methoxyethoxysilane) can be used in solution polymerization to improve solution performance, but Since siloxane is easily hydrolyzed, a large amount of coagulation is produced, and the polymerization reaction cannot be carried out in the aqueous phase. Therefore, the application of direct polymerization of organosiloxanes containing unsaturated groups and other organosilicon monomers to improve emulsion properties is still very limited. few
Although JP51-146525 and JP54-3512 are directly polymerized with organosiloxanes containing unsaturated groups and other organosilicon monomers, the stability of the emulsion is poor, and separation and coagulation occur
CN1217360A, CN1217360A uses hydroxyl polysiloxane to protect organosiloxane, the method first synthesizes hydroxyl polysiloxane, then adds it to the polymerization system, and carries out grafting reaction between hydroxyl siloxane and organosiloxane to protect organosilicon The oxane is not hydrolyzed, and the grafted siloxane is used as a crosslinking agent to improve the performance of the emulsion, and the process is complicated
However, because the invention directly adds the siloxane crosslinking agent into the polymerization reaction, although the obtained coating film has good resistance to organic solvents, alkali resistance, acid resistance, water resistance and pressure resistance, the storage period is short, only 1 to 2 days

Method used

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  • Method for polymerizing water-borne acrylate coating
  • Method for polymerizing water-borne acrylate coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] a) Add the hard monomer dropwise into the emulsifier aqueous solution containing the initiator, and react at 50-90°C; wherein the hard monomer is methyl methacrylate, and the emulsifier is sodium lauryl sulfate, the dosage 0.1wt% of the total mass of the monomer;

[0035] b) After adding the hard monomer dropwise, after the reaction for at least 35 minutes, add the soft monomer dropwise and continue the heat preservation reaction for at least 1 hour; the soft monomer is methyl acrylate; when adding the monomer, add the hard monomer first, and then add the soft monomer Body, so that the latex particles are hard on the inside and soft on the outside, so as to ensure a certain hardness and at the same time form a film at a lower temperature;

[0036] c) adding a metal ion cross-linking agent into the system; after reacting for at least 2 hours, discharging. During the reaction, measure the pH value every 30 minutes, and keep the pH value in the range of 6-8. Wherein, the...

Embodiment 2

[0038] a) Add the hard monomer dropwise into the emulsifier aqueous solution containing the initiator, and react at 50-90°C; wherein the hard monomer is acrylonitrile, and the emulsifier is sodium dodecylbenzenesulfonate, and the dosage is 4wt% of the total mass of the monomer;

[0039] b) After adding the hard monomer dropwise, after the reaction for at least 35 minutes, add the soft monomer dropwise and continue the heat preservation reaction for at least 1 hour; the soft monomer is ethyl acrylate; when adding the monomer, add the hard monomer first, and then add the soft monomer Body, so that the latex particles are hard on the inside and soft on the outside, so as to ensure a certain hardness and at the same time form a film at a lower temperature;

[0040] c) adding a metal ion cross-linking agent into the system; after reacting for at least 2 hours, discharging. During the reaction, measure the pH value every 30 minutes, and keep the pH value in the range of 6-8. Where...

Embodiment 3

[0042] a) Add the hard monomer dropwise into the emulsifier aqueous solution containing the initiator, and react at 50-90°C; wherein the hard monomer is acrylonitrile, and the emulsifier is sodium dodecylbenzenesulfonate, and the dosage is 2wt% of the total mass of the monomer;

[0043] b) After adding the hard monomer dropwise, after the reaction for at least 35 minutes, add the soft monomer dropwise and continue the heat preservation reaction for at least 1 hour; the soft monomer is ethyl acrylate; when adding the monomer, add the hard monomer first, and then add the soft monomer Body, so that the latex particles are hard on the inside and soft on the outside, so as to ensure a certain hardness and at the same time form a film at a lower temperature;

[0044] c) adding a metal ion cross-linking agent into the system; after reacting for at least 2 hours, discharging. During the reaction, measure the pH value every 30 minutes, and keep the pH value in the range of 6-8. Where...

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Abstract

The invention relates to a method for polymerizing a water-borne acrylate coating. Hard monomers, soft monomers and a metallic-ion crosslinking agent are subjected to emulsion polymerization in an initiating system to form the water-borne acrylate coating. By adding the crosslinking agent for crosslinking modification of water-borne acrylate, the water-borne acrylate coating with high water resistance, solvent resistance, acid resistance, compressive property and long storage period is obtained. The water-borne acrylate coating prepared by the method can serve as a priming coat or finishing coat material for coatings or building materials, an adhesive, a pressure-sensitive adhesive, a processing agent for paper or a finishing coat material for textiles, particularly serves as the finishing coat material for the coatings or the building materials.

Description

technical field [0001] The invention relates to a polymerization method for water-based paint, in particular to a polymerization method for improving the performance of acrylate water-based paint. Background technique [0002] Waterborne acrylate copolymer emulsion has excellent weather resistance, acid and alkali resistance, stain resistance, environmental friendliness and other properties, and has become an important coating variety. However, pure acrylic and styrene-acrylic coatings have defects such as high film-forming temperature, low mechanical strength of the coating film, and poor anti-adhesive properties. They can only be modified by introducing functional monomers, or by means of core-shell emulsion polymerization and soap-free polymerization. It is unable to meet the increasingly high application requirements. [0003] Therefore, people have carried out a lot of research on emulsions capable of forming films at room temperature, such as: US4772680 obtains room t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/14C08F220/44C08F220/18C08F2/30C08F2/26C08J3/24C09D133/12C09D133/08C09D133/20C09D7/12
Inventor 张国胜胡兰梅长林
Owner ANHUI JINDUN PAINT
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