A kind of epoxy resin for low gloss powder coating and its preparation method and application

Abstract

The invention discloses an epoxy resin for low-gloss powder paint, and a preparation method and application thereof. The epoxy resin is a modified epoxy resin, is synthesized from raw materials capable of increasing the curing reaction speed, and has the characteristics of narrow molecular weight distribution, low melt viscosity and low content of impurity structures; when the epoxy resin is used for preparing low-gloss powder paint, favorable construction performance can be obtained; the paint has the advantages of favorable leveling property and high curing speed; and the paint film has the advantages of excellent extinction property and favorable physical properties. When being used for preparing the extinction powder paint, the epoxy resin can reduce the consumption of the extinction curing agent, thereby lowering the cost; and meanwhile, the epoxy resin has the characteristic of high yellowing resistance.

Description

technical field

[0001] The invention relates to the field of coatings, in particular to an epoxy resin for powder coatings and a preparation method and application thereof. Background technique

[0002] Industrial "three wastes" seriously pollute the environment. Countries around the world are increasingly demanding environmental protection, and regulations on volatile organic compound (VOC) emissions are becoming increasingly stringent. The development of environmentally friendly coatings has become the general trend.

[0003] Powder coating is an environmentally friendly coating with 100% solid content and coated in powder form. It has the advantages of high coating efficiency, good protection and decorative performance, and has received extensive attention from all over the world, thus achieving sustained and rapid development. . Powder coating has the characteristics of reducing environmental pollution, simple process, easy to realize automation, strong and durable coat...

Examples

Embodiment 1

[0048] Add 1mol liquid bisphenol A type epoxy resin 128E, 0.4~0.6mol bisphenol A, 0.04~0.1mol butylphenol into the reaction tank at room temperature, heat to 80~130℃, melt and mix for 10~60min, then add The catalyst is sodium hydroxide, the catalyst amount is 0.1% of the mass of the whole mixture added, and the temperature is continuously raised to 140-180°C for reaction, and the reaction time is 1-2h. Add 0.1-0.2 mol of bisphenol A, react at 140-180° C. for 1-2 hours, and the reaction ends.

Embodiment 2

[0050] Add 1mol liquid bisphenol A epoxy resin 127E, 0.05~0.2mol solid bisphenol A epoxy resin 901, and 0.5~0.8mol bisphenol A into the reaction tank at room temperature, heat to 80~130°C, melt and mix 10-60 minutes, then add the catalyst ethyltriphenylphosphine bromide, the amount of the catalyst is 0.15% of the mass of the whole mixture added, continue to heat up to 140-180°C for reaction, and the reaction time is 1-2 hours. Add 0.04~0.1mol amylphenol, react at 140~180°C, and the reaction time is 1~2h, and the reaction ends.

Embodiment 3

[0052] Add 1mol liquid bisphenol A epoxy resin 128E, 0.05~0.2mol solid bisphenol A epoxy resin 301, 0.2~0.4mol bisphenol A, 0.04~0.1mol heptylphenol into the reaction tank at room temperature, and heat Heat up to 80-130°C, melt and mix for 10-60 minutes, then add catalyst butyltriphenylphosphine bromide, the catalyst amount is 0.05% of the mass of the whole mixture added, heat up to 140-180°C for reaction, and the reaction time is 1-3h . Add 0.1-0.2 mol of bisphenol A, react at 140-180° C. for 1-2 hours, and the reaction ends.

technical field

[0001] The invention relates to the field of coatings, in particular to an epoxy resin for powder coatings and a preparation method and application thereof. Background technique

[0002] Industrial "three wastes" seriously pollute the environment. Countries around the world are increasingly demanding environmental protection, and regulations on volatile organic compound (VOC) emissions are becoming increasingly stringent. The development of environmentally friendly coatings has become the general trend.

[0003] Powder coating is an environmentally friendly coating with 100% solid content and coated in powder form. It has the advantages of high coating efficiency, good protection and decorative performance, and has received extensive attention from all over the world, thus achieving sustained and rapid development. . Powder coating has the characteristics of reducing environmental pollution, simple process, easy to realize automation, strong and durable coat...

Examples

Embodiment 1

[0048] Add 1mol liquid bisphenol A type epoxy resin 128E, 0.4~0.6mol bisphenol A, 0.04~0.1mol butylphenol into the reaction tank at room temperature, heat to 80~130℃, melt and mix for 10~60min, then add The catalyst is sodium hydroxide, the catalyst amount is 0.1% of the mass of the whole mixture added, and the temperature is continuously raised to 140-180°C for reaction, and the reaction time is 1-2h. Add 0.1-0.2 mol of bisphenol A, react at 140-180° C. for 1-2 hours, and the reaction ends.

Embodiment 2

[0050] Add 1mol liquid bisphenol A epoxy resin 127E, 0.05~0.2mol solid bisphenol A epoxy resin 901, and 0.5~0.8mol bisphenol A into the reaction tank at room temperature, heat to 80~130°C, melt and mix 10-60 minutes, then add the catalyst ethyltriphenylphosphine bromide, the amount of the catalyst is 0.15% of the mass of the whole mixture added, continue to heat up to 140-180°C for reaction, and the reaction time is 1-2 hours. Add 0.04~0.1mol amylphenol, react at 140~180°C, and the reaction time is 1~2h, and the reaction ends.

Embodiment 3

[0052] Add 1mol liquid bisphenol A epoxy resin 128E, 0.05~0.2mol solid bisphenol A epoxy resin 301, 0.2~0.4mol bisphenol A, 0.04~0.1mol heptylphenol into the reaction tank at room temperature, and heat Heat up to 80-130°C, melt and mix for 10-60 minutes, then add catalyst butyltriphenylphosphine bromide, the catalyst amount is 0.05% of the mass of the whole mixture added, heat up to 140-180°C for reaction, and the reaction time is 1-3h . Add 0.1-0.2 mol of bisphenol A, react at 140-180° C. for 1-2 hours, and the reaction ends.

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