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CN-121975390-A - Fluorine-free high-temperature powder coating and preparation method thereof

CN121975390ACN 121975390 ACN121975390 ACN 121975390ACN-121975390-A

Abstract

The invention relates to a fluorine-free high-temperature powder coating and a preparation method thereof, wherein the fluorine-free high-temperature powder coating comprises, by mass, 60 parts of solid alkaline phenolic resin, 40-50 parts of melamine formaldehyde resin, 60-70 parts of modified micron-sized alumina, 11-20 parts of modified micron-sized hexagonal boron nitride, 10-20 parts of epoxy polysiloxane and 1-5 parts of pigment, wherein the modified micron-sized alumina and the modified micron-sized hexagonal boron nitride are prepared by modifying micron-sized alumina and micron-sized hexagonal boron nitride by a zirconate coupling agent, triethanolamine borate and a silane coupling agent. The fluorine-free high-temperature powder coating can resist the temperature of more than 300 ℃ and can be used for a long time at high temperature.

Inventors

  • GUO XIAOMING
  • GUO BIECHUAN
  • YU XING

Assignees

  • 中山虹丽美新材料科技有限公司

Dates

Publication Date
20260505
Application Date
20260311

Claims (10)

  1. 1. The fluorine-free high-temperature powder coating is characterized by comprising the following components in parts by weight: 60 parts of solid alkaline phenolic resin; 40-50 parts of melamine formaldehyde resin; 60-70 parts of modified micron-sized alumina; 11-20 parts of modified micron-sized hexagonal boron nitride; 10-20 parts of epoxy polysiloxane; 1-5 parts of pigment; The modified micron-sized alumina and the modified micron-sized hexagonal boron nitride are prepared by modifying micron-sized alumina and micron-sized hexagonal boron nitride by a zirconate coupling agent, triethanolamine borate and a silane coupling agent.
  2. 2. The fluorine-free high-temperature powder coating according to claim 1, which is characterized by comprising the following components in parts by weight: 60 parts of solid alkaline phenolic resin; 40-43 parts of melamine formaldehyde resin; 60-66 parts of modified micron-sized alumina; 15-20 parts of modified micron-sized hexagonal boron nitride; 16-20 parts of epoxy polysiloxane; 1-5 parts of pigment.
  3. 3. The fluorine-free high-temperature powder coating according to claim 1 or 2, wherein the ratio of the total mass of the micron-sized aluminum oxide and the micron-sized hexagonal boron nitride, the mass of the zirconate coupling agent, the mass of the triethanolamine borate and the mass of the silane coupling agent is 100 (0.2-0.7): (0.3-0.5): (0.5-1.2).
  4. 4. The fluorine-free high-temperature powder coating according to claim 3, wherein the ratio of the total mass of the micron-sized aluminum oxide and the micron-sized hexagonal boron nitride to the mass of the zirconate coupling agent to the mass of the triethanolamine borate to the mass of the silane coupling agent is 100 (0.3-0.5): (0.3-0.4): (0.8-1.1).
  5. 5. The fluorine-free high-temperature powder coating according to claim 1 or 2, wherein the average particle size of the micron-sized aluminum oxide is 1-10 μm, and the average particle size of the micron-sized hexagonal boron nitride is 1-10 μm.
  6. 6. The fluorine-free high-temperature powder coating according to claim 1 or 2, wherein the zirconate coupling agent is tetraisopropyl zirconate, and the silane coupling agent is gamma- (2, 3-glycidoxy) propyl trimethoxysilane.
  7. 7. A method for preparing a fluorine-free high temperature powder coating according to any one of claims 1 to 6, characterized by comprising the steps of: preparing modified micron-sized alumina and modified micron-sized hexagonal boron nitride; Extruding, mixing and granulating melamine formaldehyde resin, modified micron-sized alumina, modified micron-sized hexagonal boron nitride, epoxy polysiloxane and pigment to obtain an intermediate product; And thirdly, mixing and crushing the solid alkaline phenolic resin and the intermediate product to uniformly disperse the components, thereby obtaining the fluorine-free high-temperature powder coating.
  8. 8. The method for preparing the fluorine-free high-temperature powder coating according to claim 7, wherein in the first step, micron-sized alumina and modified micron-sized hexagonal boron nitride are uniformly mixed in a high-speed mixer, an ethanol solution containing a zirconate coupling agent, triethanolamine borate and a silane coupling agent is sprayed under stirring, the stirring is continued for a period of time after the spraying is finished, and then the mixture is dried to obtain modified micron-sized alumina and modified micron-sized hexagonal boron nitride.
  9. 9. The method for preparing a fluorine-free high temperature powder coating according to claim 7, wherein in the second step, the extrusion temperature is 90-110 ℃.
  10. 10. A method of producing a fluorine-free high temperature powder coating material according to claim 7, wherein in said step three, said mixing is performed in a high speed mixer and said pulverizing is performed in a pulverizer.

Description

Fluorine-free high-temperature powder coating and preparation method thereof Technical Field The invention relates to the field of powder coatings, in particular to a fluorine-free high-temperature powder coating and a preparation method thereof. Background The working temperature of the common powder coating is not more than 150 ℃, and the coating can be discolored and cracked after the working temperature exceeds 150 ℃. In daily life and industrial production, some devices need to use high temperature resistant coating materials, such as ovens, warmers, fireplaces, microwave ovens, exhaust pipes of vehicles, silencers, housings of engines, boilers, heat exchange pipes, etc., and in order to improve weather resistance or aesthetic appearance, these devices or devices need to be coated with high temperature resistant coating materials, and common powder coating materials are not applicable in these fields. The existing high-temperature-resistant powder coating uses fluorine-containing substances to improve the high-temperature resistance of the powder coating, and the C-F bond has ultrahigh bond energy and is not easy to decompose at high temperature, so that the powder coating can resist high temperature. However, fluorine-containing paint has poor adhesion and is liable to delaminate. Disclosure of Invention In view of the shortcomings of the prior art, a first object of the present invention is to provide a fluorine-free high temperature powder coating which can withstand temperatures above 300 ℃ and can be used for a long period of time at high temperatures. The second object of the invention is to provide a method for preparing the fluorine-free high-temperature powder coating. The invention provides a fluorine-free high-temperature powder coating which comprises, by mass, 60 parts of solid alkaline phenolic resin, 40-50 parts of melamine formaldehyde resin, 60-70 parts of modified micron-sized alumina, 11-20 parts of modified micron-sized hexagonal boron nitride, 10-20 parts of epoxy polysiloxane and 1-5 parts of pigment, wherein the modified micron-sized alumina and the modified micron-sized hexagonal boron nitride are prepared by modifying micron-sized alumina and micron-sized hexagonal boron nitride by a zirconate coupling agent, triethanolamine borate and a silane coupling agent. In some embodiments of the invention, the fluorine-free high-temperature powder coating comprises, by mass, 60 parts of solid alkaline phenolic resin, 40-43 parts of melamine formaldehyde resin, 60-66 parts of modified micron-sized aluminum oxide, 15-20 parts of modified micron-sized hexagonal boron nitride, 16-20 parts of epoxy polysiloxane and 1-5 parts of pigment. In some embodiments of the invention, the ratio of the total mass of the micron-sized aluminum oxide and the micron-sized hexagonal boron nitride, the mass of the zirconate coupling agent, the mass of the triethanolamine borate and the mass of the silane coupling agent is 100 (0.2-0.7): 0.3-0.5): 0.5-1.2. In some embodiments of the invention, the ratio of the total mass of the micron-sized aluminum oxide and the micron-sized hexagonal boron nitride, the mass of the zirconate coupling agent, the mass of the triethanolamine borate and the mass of the silane coupling agent is 100 (0.3-0.5): 0.3-0.4): 0.8-1.1. In some embodiments of the invention, the average particle size of the micron-sized aluminum oxide is 1-10 μm, and the average particle size of the micron-sized hexagonal boron nitride is 1-10 μm. In some embodiments of the invention, the zirconate coupling agent is tetraisopropyl zirconate and the silane coupling agent is gamma- (2, 3-glycidoxy) propyl trimethoxysilane. The invention provides a preparation method of the fluorine-free high-temperature powder coating, which comprises the following steps of preparing modified micron-sized aluminum oxide and modified micron-sized hexagonal boron nitride, extruding, mixing and granulating melamine formaldehyde resin, modified micron-sized aluminum oxide, modified micron-sized hexagonal boron nitride, epoxy polysiloxane and pigment to obtain an intermediate product, and mixing and crushing solid alkaline phenolic resin and the intermediate product to uniformly disperse all components to obtain the fluorine-free high-temperature powder coating. In some embodiments of the present invention, in the first step, the micron-sized alumina and the modified micron-sized hexagonal boron nitride are mixed uniformly in a high-speed mixer, an ethanol solution containing a zirconate coupling agent, triethanolamine borate and a silane coupling agent is sprayed under stirring, and after the spraying is finished, the stirring is continued for a period of time, and then the mixture is dried, so as to obtain the modified micron-sized alumina and the modified micron-sized hexagonal boron nitride. In some embodiments of the present invention, in the second step, the extrusion temperature is 90 to 110 ℃. In some embodiments of the in