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Preparation method of water dispersible epoxy resin

An epoxy resin, dispersion-type technology, applied in the field of epoxy resin, can solve the problems of difficulty in obtaining non-ionic active epoxy resin emulsifier, limited effect of phase inversion emulsified solid epoxy resin, etc., to achieve good water dispersion performance, The effect of stable storage and easy availability of materials

Active Publication Date: 2021-05-14
韶关东森合成材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the liquid epoxy resin only contains a small amount of hydroxyl groups, and its reaction with polyethylene glycol monomethyl ether-terminated diisocyanate will be difficult to obtain a sufficient mass fraction of non-ionic reactive epoxy resin emulsifiers, so it is ultimately used for phase inversion emulsification Solid epoxy has very limited effectiveness

Method used

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  • Preparation method of water dispersible epoxy resin
  • Preparation method of water dispersible epoxy resin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] S1. Add 2229.25 kg of toluene diisocyanate and 200 kg of isomeric grade xylene to the dry reactor, keep stirring and feed nitrogen, and heat to 85 °C; mix 1000 kg of E-20 type epoxy resin with 250 Kilograms of ethyl acetate were mixed evenly and dropped into the reactor at a constant speed to react with toluene diisocyanate. The dropping time was 170 minutes, the reaction time was 6.0 hours, and the reaction temperature was 85-90°C to obtain a prepolymer;

[0027] Among them, the molar ratio of isocyanate groups in toluene diisocyanate to hydroxyl groups in E-20 epoxy resin is 8:1.

[0028] S2. The resulting prepolymer is removed by a two-stage thin-film evaporator to remove excess free toluene diisocyanate monomer until the free toluene diisocyanate in the detected prepolymer reaction solution is less than 0.5wt of the total amount of materials in the reaction system %, intermediate product is obtained;

[0029] S3. Under nitrogen protection, 1120 kg of polyethylene g...

Embodiment 2

[0032] S1. Add 2006.32 kg of toluene diisocyanate and 190 kg of isomeric grade xylene in the dry reactor, keep stirring and feed nitrogen, and heat to 85 °C; mix 800 kg of E-20 type epoxy resin with 200 kg Kilograms of butyl acetate are mixed evenly and dropped into the reactor at a constant speed to react with toluene diisocyanate. The dropping time is 150 minutes, the reaction time is 6.5 hours, and the reaction temperature is 85-90°C to obtain a prepolymer;

[0033] Among them, the molar ratio of isocyanate groups in toluene diisocyanate to hydroxyl groups in E-20 epoxy resin is 9:1.

[0034] S2. The resulting prepolymer is removed by a two-stage thin-film evaporator to remove excess free toluene diisocyanate monomer until the free toluene diisocyanate in the detected prepolymer reaction solution is less than 0.5wt of the total amount of materials in the reaction system %, intermediate product is obtained;

[0035] S3. Under nitrogen protection, 896 kg of polyethylene glyc...

Embodiment 3

[0038] S1. Add 2507.90 kg of toluene diisocyanate and 250 kg of isomeric grade xylene to the dry reactor, keep stirring and feed nitrogen, and heat to 85 °C; mix 900 kg of E-20 type epoxy resin with 230 Kg of isomeric grade toluene and 230 kg of butyl acetate are mixed evenly and then dropped into the reactor at a constant speed to react with toluene diisocyanate. The dropping time is 180min, the reaction time is 7.0h, and the reaction temperature is 85-90°C to obtain prepolymerized body;

[0039] Among them, the molar ratio of isocyanate groups in toluene diisocyanate to hydroxyl groups in E-20 epoxy resin is 10:1.

[0040] S2. the obtained prepolymer adopts two-stage thin-film evaporator to remove excess free toluene diisocyanate monomer until the free toluene diisocyanate in the detected prepolymer reaction solution is less than 0.5wt% of the total raw material, and intermediate product;

[0041] S3. Under nitrogen protection, 1008 kg of polyethylene glycol monomethyl ether...

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Abstract

The invention relates to a preparation method of water-dispersible epoxy resin, which comprises the following steps: S1, adding epoxy resin into a solvent, and dropwise adding toluene diisocynate to obtain a prepolymer; S2, purifying the prepolymer by adopting a film evaporator to obtain an intermediate product; and S3, adding methoxypolyethylene glycol into the intermediate product, carrying out heating reaction, carrying out reduced pressure distillation, and adding water to obtain the product. Through adoption of a chemical modification method, low-molecular-weight polyethylene glycol monomethyl ether which is easy to obtain, low in cost and hydrophilic is introduced to an epoxy resin molecular skeleton, and the water-dispersible epoxy resin which is good in water dispersion performance, stable in storage and good in water resistance is prepared.

Description

technical field [0001] The invention belongs to the field of epoxy resin, and in particular relates to a preparation method of water-dispersed epoxy resin. Background technique [0002] Epoxy resin has excellent comprehensive properties and is a very important class of polymer materials today. It is widely used in the fields of coatings, composite materials and adhesives. However, epoxy resins are insoluble in water and often need to be dissolved in organic solvents such as aromatic hydrocarbons, ketones or alcohol ethers during use. The use of organic solvents is not only costly, but also flammable and explosive, which poses a great safety hazard. The volatilization of a large amount of organic solvents during use will also cause serious air pollution. Therefore, the water-based epoxy resin has become a very urgent and popular research direction in the field of epoxy resin. [0003] According to the classification of preparation methods, the water-based methods of epoxy r...

Claims

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Application Information

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IPC IPC(8): C08G81/00
CPCC08G81/00
Inventor 李国荣
Owner 韶关东森合成材料有限公司
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