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Water-borne epoxy resin and preparation method thereof

A water-based epoxy resin and epoxy resin technology, applied in the field of polymer materials, can solve the problems of difficult drying of the coating film, difficulty in evaporating water, and low evaporation rate

Pending Publication Date: 2021-09-14
NAT ENG LAB FOR HIGH SPEED RAILWAY CONSTR +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, water-based epoxy resin materials contain a large amount of water. Water is a small polar molecule with a high tendency to hydrogen bond, resulting in high heat capacity and high boiling point, making water from epoxy resin coatings The volatilization rate is relatively low, especially in low temperature or high humidity environment, the moisture is difficult to volatilize, and the coating film is difficult to dry
Secondly, with the volatilization of water in the system, after the system dries and forms a film, there is a problem of shrinkage

Method used

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  • Water-borne epoxy resin and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] S1: Weigh 90 parts of lauric acid and 10 parts of polyethylene glycol ether, mix evenly, stir at 70°C until melting, and obtain the shell material;

[0039] S2: Weighing 20 parts of starch-grafted acrylate water-absorbing resin, adding to 80 parts of the shell material prepared in S1 and stirring evenly, after spraying and condensing, an encapsulated water-absorbing resin is obtained;

[0040] S3: Weigh 30 parts of bisphenol A type epoxy resin E51, 1 part of encapsulated water-absorbing resin, 20 parts of polyethylene glycol modified fatty amine and 49 parts of water, and first mix the bisphenol A type epoxy resin E51. Polyethylene glycol-modified fatty amine is mixed and pre-reacted for 1 min, then added with water and stirred until homogeneously emulsified, then added with encapsulated water-absorbing resin and stirred evenly to obtain a water-based epoxy resin emulsion.

Embodiment 2

[0042] S1: Weigh 70 parts of lauric acid and 30 parts of polyethylene glycol ether, mix evenly, stir at 70°C until melting, and obtain the shell material;

[0043] S2: Weighing 20 parts of starch-grafted acrylate water-absorbing resin, adding to 80 parts of the shell material prepared in S1 and stirring evenly, after spraying and condensing, an encapsulated water-absorbing resin is obtained;

[0044] S3: Weigh 30 parts of bisphenol A epoxy resin E51, 5 parts of encapsulated water-absorbing resin, 20 parts of carboxyl-terminated polyether modified fatty amine and 45 parts of water, and first mix bisphenol A epoxy resin E51. Carboxyl-terminated polyether-modified fatty amine is mixed and pre-reacted for 1 min, then added with water and stirred until homogeneously emulsified, then added with encapsulated water-absorbing resin and stirred evenly to obtain a water-based epoxy resin emulsion.

Embodiment 3

[0046] S1: Weigh 80 parts of lauric acid and 20 parts of polyethylene glycol ether, mix evenly, stir at 70°C until melting, and obtain the shell material;

[0047] S2: Weighing 20 parts of starch-grafted polyacrylamide water-absorbing resin, adding to 80 parts of the shell material prepared in S1 and stirring evenly, after spraying and condensing, an encapsulated water-absorbing resin is obtained;

[0048] S3: Weigh 35 parts of bisphenol A epoxy resin E51, 5 parts of neopentyl glycol diglycidyl ether, 5 parts of phenyl glycidyl ether, 5 parts of encapsulated water-absorbing resin, and 30 parts of carboxyl-terminated polyether Modified fatty amine and 20 parts of water, first mix bisphenol A epoxy resin E51, neopentyl glycol diglycidyl ether, phenyl glycidyl ether, carboxyl-terminated polyether modified fatty amine for 1 min, add water Stir until it is homogeneously emulsified, then add the encapsulated water-absorbing resin and stir evenly to obtain a water-based epoxy resin emu...

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Abstract

The invention discloses a waterborne epoxy resin, which is prepared from the following components in percentage by mass: 30-45% of an epoxy resin, 1-5% of encapsulated water-absorbent resin, 20-30% of a curing agent and the balance of water, wherein the encapsulated water-absorbent resin is formed by compounding a core material and a shell material, and the shell material is composed of at least one of lauric acid and paraffin and polyglycol ether, and the core material is prepared from at least one of starch grafted acrylate water-absorbent resin, starch grafted polyacrylamide water-absorbent resin and cellulose grafted acrylamide water-absorbent resin. By utilizing the characteristic of delayed water absorption of the encapsulated water-absorbent resin, on the premise of ensuring the initial working performance of the water-borne epoxy resin, the curing rate of the water-borne epoxy resin is improved, and the shrinkage rate of a cured product of the water-borne epoxy resin is effectively reduced.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to a water-based epoxy resin and a preparation method thereof. Background technique [0002] Epoxy resin coatings are currently the most important anti-corrosion coatings with the largest number of applications, the widest range of applications in the world. Epoxy resin coatings are generally divided into two types: solvent-based epoxy resin coatings and water-based epoxy resin coatings. Solvent-based epoxy resin will volatilize a large amount of organic solvents during production and construction, endangering the health of construction workers. Water-based epoxy resin has the advantages of low VOC, high efficiency, energy saving, etc. It does not require special equipment during construction, can be cured at room temperature, and has a wide range of construction applications. [0003] However, water-based epoxy resin materials contain a large amount of water. Water is a...

Claims

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Application Information

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IPC IPC(8): C08L63/00C08L51/02C08L71/02C08L91/06C08K5/09C08J3/03
CPCC08J3/03C08J2363/00C08J2451/02C08J2471/02C08J2491/06C08K5/09
Inventor 范冬冬黄海温建峰彭建伟赵杰闫骐隆元强潘红桂何晓东余志武
Owner NAT ENG LAB FOR HIGH SPEED RAILWAY CONSTR
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