Epoxy powder coating with self-repairing function and preparation method thereof

An epoxy powder and coating technology, applied in the field of powder coatings, can solve the problems of impact damage coating, poor weather resistance, low crosslinking degree, etc., and achieve good compatibility, good alkali resistance, and low curing temperature Effect

Active Publication Date: 2016-03-16
南通南京大学材料工程技术研究院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Although the epoxy-polyester powder coating has many advantages, its crosslinking degree in the cured coating film is low, and the resin contains a large number of ether bonds, which will be easily degraded by sunlight, resulting in poor toughness , poor heat resistance and poor weather resistance
These problems often occur in the actual social life, irreversible impact damage or coating failure of the coating of the object during use or transportation.

Method used

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  • Epoxy powder coating with self-repairing function and preparation method thereof
  • Epoxy powder coating with self-repairing function and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Weigh 231.25g of epichlorohydrin, 77.35g of 4,4'-diallyl bisphenol A and 1.25g of 75% mass percent ethyltriphenylphosphine acetate methanol solution in a 500mL four-necked flask in (wherein N 2 protection), put it into a reflux condenser, and insulate and react at 100°C for 2h. Then the temperature was lowered to 85° C., and 40 g of the newly prepared NaOH aqueous solution with a concentration of 48% by mass was dripped at a constant speed within 1 hour, and kept for 1 hour. After the reaction is complete, transfer the mixture to a 500mL single-necked flask, put it into a rotary evaporator, and evaporate the epichlorohydrin under reduced pressure (the temperature is gradually increased from 70°C to 140°C to ensure that the epichlorohydrin is completely evaporated). The crude product 4,4'-diallyl bisphenol A diglycidyl ether epoxy resin was obtained. Add 100 g of toluene and 50 g of a freshly prepared NaOH aqueous solution with a concentration of 5% by mass to the crud...

Embodiment 2

[0042] Weigh 24.87g of 4,4'-diallyl bisphenol A diglycidyl ether epoxy resin prepared in Example 1 and 23.27g, epoxy equivalent of bisphenol A diglycidyl ether of 833g / mol in a 250mL beaker Mix evenly in the beaker, add 1.47g of zinc acetylacetonate to the beaker, raise the temperature to 125°C so that the zinc acetylacetonate is uniformly dispersed in the resin. Then cool down to 40°C and add 6.37g glutaric anhydride, 0.56g dicumyl peroxide, 41g barium precipitation, 1g leveling agent (H88 leveling agent, Hubei Laisi), 0.7g701B, 0.5g benzoin, 0.3g wax powder and 0.5g carbon black, stir evenly, pour into the mold, and start to heat up and solidify in the oven. Raise the temperature to 100°C and keep it for 1 hour; then increase the temperature to 120°C and keep it for 1 hour; finally raise it to 150°C and keep it for 2 hours to get a cured resin.

[0043] Grind and sieve the cured resin to obtain epoxy powder coating with self-healing function.

[0044] Lightly scratch the c...

Embodiment 3

[0047] Weigh 40g, 4,4'-diallyl bisphenol A diglycidyl ether epoxy resin with epoxy equivalent of 333g / mol and 20g of bisphenol A diglycidyl ether with epoxy equivalent of 900g / mol in Mix evenly in a 500mL beaker, add 5g of zinc acetylacetonate into the beaker, raise the temperature to 120°C so that the zinc acetylacetonate is uniformly dispersed in the resin. Then cool down to 45°C and add 10g methyl hexahydrophthalic anhydride, 1g dicumyl peroxide, 45g barium precipitation, 2g leveling agent (H88 leveling agent, Hubei Laisi), 1g701B, 1g benzoin, 1g wax powder and 1g Carbon black, after stirring evenly, pour it into the mold, and start to heat up and solidify in the oven. Raise the temperature to 115°C and keep it for 2 hours; then increase the temperature to 145°C and keep it for 2 hours; finally raise it to 175°C and keep it for 1 hour to get a cured resin.

[0048] Grind and sieve the cured resin to obtain epoxy powder coating with self-healing function.

[0049] Lightly ...

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Abstract

The invention discloses an epoxy powder coating with a self-repairing function and a preparation method thereof. The epoxy powder coating is prepared from the following raw materials (by weight): 40-60 parts of matrix resin, 5-10 parts of acid anhydride, 1-5 parts of zinc acetylacetonate, 0.1-1 part of dicumyl peroxide, 40-45 parts of precipitated barium, 0.5-2 parts of a leveling agent, 0.5-1 part of 701 B, 0.1-1 part of benzoin, 0.1-1 part of wax powder and 0.5-1 part of carbon black. The matrix resin is matrix resin with an allyl structure. Free radical polymerization is initiated through the allyl structure and dicumyl peroxide to raise crosslinking density and glass transition temperature of epoxy resin, and self-repairing performance of the epoxy powder coating is improved through ester group dynamic crosslinking. The preparation method of the epoxy powder coating is simple to operate, is low-cost and is suitable for industrial production.

Description

technical field [0001] The invention relates to the field of powder coatings, in particular to an epoxy powder coating with self-repairing function and a preparation method thereof. Background technique [0002] Powder coating is a solid powder coating product used to decorate metal material substrates and form a protective film. [0003] With the development of my country's economy, epoxy powder coatings have been used in all aspects of people's daily life, such as cars, refrigerators and so on. Epoxy resin has been the most widely used resin material in today's society since it was applied to industrial production in the United States in 1947. [0004] Among the currently used epoxy powder coatings, the most widely used are powder coatings produced by mixing epoxy-polyester. For example: the powder coating for body coating and its preparation method disclosed in Chinese patent application CN201510349629.1, the powder coating for body coating is calculated by weight fract...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D163/00C09D5/16C09D5/03C09D7/12
CPCC08L2312/00C09D5/033C09D5/1687C09D163/00C08L91/06C08K13/02C08K3/04
Inventor 任华朱继婷顾婷婷仇叶云张亚宋帅
Owner 南通南京大学材料工程技术研究院
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