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Epoxy resin emulsion and application thereof in water-based paint

A water-based epoxy resin and emulsion technology, applied in the field of coatings, can solve the problems of affecting the service life of coatings and poor weather resistance, and achieve the effect of improving salt spray corrosion resistance and hardness

Inactive Publication Date: 2020-08-18
南京霄祥工程技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, in the prior art, the acrylic modified water-based epoxy resin coating still has the disadvantage of poor weather resistance under some corrosive conditions and ultraviolet conditions, which affects the service life of the coating.

Method used

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  • Epoxy resin emulsion and application thereof in water-based paint
  • Epoxy resin emulsion and application thereof in water-based paint
  • Epoxy resin emulsion and application thereof in water-based paint

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preparation example Construction

[0034] The preparation method of the second described aqueous epoxy resin emulsion, comprises the steps:

[0035]Step 1, preparation of polyether polyol: add glycerin and KOH into the reaction kettle, replace with nitrogen, then vacuum dehydrate, then add propylene oxide, heat for reaction, after the reaction, add diatomaceous earth for neutralization , and then perform suction filtration, and the filtrate is distilled under reduced pressure to remove water and low boiling point substances to obtain polyether polyol; wherein, the molar ratio of glycerin, propylene oxide and KOH is 1:35-50:0.2-0.3;

[0036]

[0037] Step 2, hydroxyl substitution reaction: in parts by weight, mix 20-25 parts of polyether polyol, 0.1-0.2 parts of sodium hydride, and 400-500 parts of N, N-dimethylformamide, and carry out at room temperature Reaction, after the reaction is finished, filter, and in the filtrate, it is a polyether polyol substituted by Na;

[0038]

[0039] The third step, the...

Embodiment 1

[0064] The preparation of the second aqueous epoxy resin emulsion that adopts in the coating:

[0065] The first step, the preparation of polyether polyol: add glycerin and KOH into the reaction kettle, replace with nitrogen, then vacuumize and dehydrate, then add propylene oxide, and heat for reaction. The reaction temperature is 105°C, and the reaction time is 5h. After the reaction is over, add diatomaceous earth for neutralization, and then perform suction filtration, and the filtrate is distilled under reduced pressure to remove water and low boiling point substances to obtain polyether polyols; wherein, the molar ratio of glycerin, propylene oxide and KOH is 1:35 : 0.2;

[0066] Step 2, hydroxyl substitution reaction: in parts by weight, mix 20 parts of polyether polyol, 0.1 part of sodium hydride, and 400 parts of N,N-dimethylformamide, and react at 20°C for 0.5h. After the reaction Filter, and in the filtrate, it is polyether polyol substituted by Na;

[0067] The th...

Embodiment 2

[0076] The preparation of the second aqueous epoxy resin emulsion that adopts in the coating:

[0077] The first step, the preparation of polyether polyol: Add glycerin and KOH into the reaction kettle, replace with nitrogen, then vacuumize and dehydrate, then add propylene oxide, and heat for reaction. The reaction temperature is 115°C and the reaction time is 8h. After the reaction is over, add diatomaceous earth for neutralization, and then perform suction filtration, and the filtrate is distilled under reduced pressure to remove water and low boiling point substances to obtain polyether polyols; wherein the molar ratio of glycerin, propylene oxide and KOH is 1:50 : 0.3;

[0078] Step 2, hydroxyl substitution reaction: in parts by weight, mix 25 parts of polyether polyol, 0.2 part of sodium hydride, and 500 parts of N, N-dimethylformamide, and react at 30°C for 1 hour. Filtrate, in the filtrate, be the polyether polyol substituted through Na;

[0079] The third step, the ...

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Abstract

The invention relates to an epoxy resin emulsion and application thereof in a water-based paint, and belongs to the technical field of paints. The emulsion is prepared by the following steps: performing crosslinking and hydrolytic polymerization on polyether and siloxane to obtain a prepolymer with unsaturated bonds, and performing grafting reactions on the prepolymer, an acrylic monomer, and epoxy resin at the same time to obtain modified epoxy resin emulsion. The emulsion has better weather resistance and ultraviolet resistance than conventional acrylic acid modified water-based epoxy resinemulsion when being applied to water-based epoxy coatings.

Description

technical field [0001] The invention relates to an epoxy resin emulsion and its application in water-based paint, belonging to the technical field of paint. Background technique [0002] The pollution caused by volatile organic compounds (VOC) released during the production and use of traditional solvent-based coatings is currently [0003] After being ranked after cars, it is listed as the main source of pollution in the city. With the advancement of science and technology and the rapid development of the economy, the lack of resources and energy has attracted the attention of countries all over the world. Saving money, energy, and protecting the environment are the main problems facing the world's coatings industry. As one of the solvent-based paint substitutes, water-based paint has been valued by countries all over the world. Water-based coatings are coatings that use water as a solvent or dispersion medium. The earliest commercialized water-based paints appeared in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/10C08F220/14C08F212/08C08F220/06C08G77/46C09D163/00C09D151/08C09D5/08C09D7/65
CPCC08F283/10C08G77/46C08L2205/03C09D5/08C09D7/65C09D163/00C08L83/12C08L51/08C08F220/1804C08F220/14C08F212/08C08F220/06C08F220/1808
Inventor 王杨张雷
Owner 南京霄祥工程技术有限公司
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