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Modified epoxy emulsion and preparation method thereof

A technology of epoxy emulsion and modification, applied in the direction of coating, etc., can solve the problems of poor compatibility between epoxy resin and emulsifier, unsatisfactory flexibility and water resistance of the coating film, and unsatisfactory use performance, etc., to achieve Excellent physical and mechanical properties, improved coating film quality, and good film-forming performance

Inactive Publication Date: 2012-07-18
JIANGSU UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, the epoxy emulsion prepared by adding an emulsifier method has a simple process and a small amount of emulsifier, but the particle size is large, and the compatibility between the epoxy resin and the emulsifier is not good; the epoxy emulsion prepared by the functional monomer chain extension method Oxygen emulsion, although the reaction is stable, but part of the epoxy group is consumed during the reaction, which is not ideal in terms of performance; the epoxy emulsion prepared by free radical grafting method, the size of the dispersed phase can reach nanometer level, and the storage stability is good , but the system has poor adaptability to pH changes, and the flexibility and water resistance of the coating film are not ideal

Method used

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  • Modified epoxy emulsion and preparation method thereof
  • Modified epoxy emulsion and preparation method thereof
  • Modified epoxy emulsion and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] 1. Weigh each component according to mass percentage

[0016]

[0017] 2. Preparation method

[0018] 1. Preparation of graft copolymer, respectively add α-methacrylic acid, butyl acrylate, styrene and benzoyl peroxide into the reaction vessel and mix evenly. After the dissolution is complete, ultrasonically shake for 25 minutes to discharge;

[0019] 2. Add epoxy resin E-06, ethylene glycol butyl ether and n-butanol into the reaction vessel and mix evenly. The temperature rises to 110°C. After the dissolution is complete, add the graft copolymer obtained in step 1 dropwise within 90 minutes at a constant speed , stirred at a medium speed, kept warm for 150 minutes, lowered the temperature to 58°C, added a mixture of γ-(2,3-glycidoxy)propyltrimethoxysilane and γ-aminopropyltriethoxysilane, kept warm Reaction 60min;

[0020] 3. After the reaction is complete, lower the temperature to 38°C, neutralize with N,N-dimethylethanolamine until the pH value is 7-8, add water...

Embodiment 2

[0025] 1. Weigh each component according to mass percentage

[0026]

[0027]

[0028] 2. Preparation method

[0029] 1. Preparation of graft copolymer, respectively add α-methacrylic acid, butyl acrylate, styrene and benzoyl peroxide into the reaction vessel and mix evenly. After the dissolution is complete, ultrasonically shake for 24 minutes to discharge;

[0030] 2. Add epoxy resin E-06, ethylene glycol butyl ether and n-butanol into the reaction vessel and mix evenly. The temperature rises to 108°C. After the dissolution is complete, add the graft copolymer obtained in step 1 dropwise at a constant speed within 88 minutes. Stir at medium speed, heat preservation reaction, 148min, lower the temperature to 57°C, add γ-(2,3-glycidoxy)propyltrimethoxysilane and γ-aminopropyltriethoxysilane mixture , heat preservation reaction, 58min;

[0031] 3. After the reaction is complete, lower the temperature to 36°C, neutralize with N,N-dimethylethanolamine until the pH value i...

Embodiment 3

[0036] 1. Weigh each component according to mass percentage

[0037]

[0038] 2. Preparation method

[0039] 1. Preparation of graft copolymer, respectively add α-methacrylic acid, butyl acrylate, styrene and benzoyl peroxide into the reaction vessel and mix evenly. After the dissolution is complete, ultrasonically shake for 26 minutes to discharge;

[0040] 2. Add epoxy resin E-06, ethylene glycol butyl ether and n-butanol into the reaction vessel and mix evenly. The temperature rises to 109°C. After the dissolution is complete, add the graft copolymer obtained in step 1 dropwise at a constant speed within 89 minutes. Stir at medium speed, keep warm for 149 minutes, lower the temperature to 59°C, add γ-(2,3-glycidoxy)propyltrimethoxysilane and γ-aminopropyltriethoxysilane mixture , heat preservation reaction, 59min;

[0041] 3. After the reaction is complete, lower the temperature to 37°C, neutralize with N,N-dimethylethanolamine until the pH value is 7-8, add water to e...

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Abstract

The invention discloses a modified epoxy emulsion and a preparation method thereof. The emulsion comprises the following components in percentage by weight: 10-15 percent of epoxy resin E-06, 8-10 percent of ethylene glycol monobutyl ether, 7-8 percent of n-butyl alcohol, 4-4.5 percent of alpha-methacrylic acid, 1-1.5 percent of styrene, 1-1.5 percent of butyl acrylate, 0.4-0.8 percent of benzoyl peroxide, 1-1.5 percent of gamma-aminopropyl triethoxy silane, 3.2-4 percent of gamma-trimethoxypropylsilane, 3.2-4.2 percent of N,N-dimethylethanolamine and 50-60 percent of water. The preparation method comprises the following steps of: preparing for graft copolymerization; then, introducing hydrophilic monomers by utilizing the graft copolymerization method; and adding a mixture for further modification to obtain the modified epoxy emulsion. The modified epoxy emulsion has the characteristics of strong adhesion, good flexibility, hardness, corrosion resistance, water resistance, alkali resistance, scrub resistance and simple preparation process.

Description

technical field [0001] The invention relates to a modified epoxy emulsion and a preparation method thereof. It belongs to the technical field of architectural coatings. Background technique [0002] In recent years, research on the preparation of epoxy emulsions at home and abroad has achieved certain results, but there are still many problems to be solved. For example, the epoxy emulsion prepared by adding an emulsifier method has a simple process and a small amount of emulsifier, but the particle size is large, and the compatibility between the epoxy resin and the emulsifier is not good; the epoxy emulsion prepared by the functional monomer chain extension method Oxygen emulsion, although the reaction is stable, but it consumes part of the epoxy group during the reaction, which is not ideal in terms of performance; the epoxy emulsion prepared by free radical grafting method can reach nanoscale in size of dispersed phase, and has good storage stability , but the system ha...

Claims

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Application Information

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IPC IPC(8): C08F283/10C08F220/06C08F212/08C08F220/18C08F8/42C09D151/08
Inventor 郭文录张秀荣卢汗清
Owner JIANGSU UNIV OF SCI & TECH
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