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CN-121975377-A - High-purity PFA coating without metal ion addition

CN121975377ACN 121975377 ACN121975377 ACN 121975377ACN-121975377-A

Abstract

The application discloses a high-purity PFA coating without metal ion addition, which is characterized by comprising 50-95 perfluorinated alkoxy resin, 4.5-49.5 of at least one regulator selected from PES polyethersulfone, PPS polyphenylene sulfide, PBI polybenzimidazole, PI polyimide or PAI polyamide-imide, and 0.2-0.5 bisphenol A epoxy resin, wherein the addition proportion of other components except PFA is more than 10% and less than 30%. Wherein the PFA is high purity PFA.

Inventors

  • CHEN SICHAO
  • Sheng Beili
  • YANG QIUFEN
  • LI BING
  • LU QI

Assignees

  • 上海旭乐皓纯设备科技有限公司
  • 上海富晨新材料有限公司
  • 上海旭乐防腐设备有限公司

Dates

Publication Date
20260505
Application Date
20260212

Claims (8)

  1. 1. The high-purity PFA coating without metal ion addition is characterized in that the high-purity PFA coating without metal ion addition comprises: perfluorinated alkoxy resin, namely 50-95 parts of PFA, wherein the PFA is high-purity PFA; 4.5-49.5 parts of at least one regulator selected from PES polyethersulfone, PPS polyphenylene sulfide, PBI polybenzimidazole, PI polyimide or PAI polyamide-imide; Bisphenol A epoxy resin 0.2-0.5, wherein the addition proportion of other components except PFA is more than 10% and less than 30%.
  2. 2. The metal ion-free high purity PFA coating of claim 1, wherein PES has an MFR value of 5 to 80 and a particle size D50 of 10 to 50um.
  3. 3. The metal ion-free high-purity PFA coating according to claim 1 or 2, wherein PPS has an MFR value of 50 to 2000 and a particle size D50 of 10 to 50 μm.
  4. 4. The metal ion-free high purity PFA coating of claim 1 or 2, wherein the PBI has an MFR value of 0.1 to 1.0 and a particle size D50 of 10 to 50 um.
  5. 5. The metal ion-free high purity PFA coating according to claim 1 or 2, wherein PI has an MFR value of 3 to 50 and a particle size D50 of 10 to 50 μm.
  6. 6. The metal ion-free high purity PFA coating of claim 1 or 2, wherein the PAI has an MFR value of 0.5 to 6.0 and a particle size D50 of 10 to 50 um.
  7. 7. The high-purity PFA coating without metal ion addition according to claim 1 or 2, wherein e=0.05 to 0.12 of bisphenol a type epoxy resin.
  8. 8. The metal ion free added high purity PFA coating of claim 1 or 2, wherein said modifier is selected from at least two of PES polyethersulfone, PPS polyphenylene sulfide, PBI polybenzimidazole, PI polyimide or PAI polyamide-imide.

Description

High-purity PFA coating without metal ion addition Technical Field The invention relates to a resin coating closely attached to a metal surface, in particular to a high-purity PFA coating without metal ion addition. Background The coating film fails because of abrasion and penetration during use when the PFA coating thickness of the metal surface in contact with various chemical media is less than 150 microns, such that the coating film cannot maintain a long-term stable corrosion-resistant effect. Particularly in environments where metal ions are to be isolated, the coating may cause metal ion elution in a short period of time, thereby reducing the reliable lifetime and quality risks to the product. However, when the thickness of the PFA coating is increased, a large amount of microbubbles are generated and remain in the coating due to oxidation during high-temperature film formation, and the coating cannot be qualified. The current solution is to add metal compounds to achieve high temperature oxidation resistance, so that the coating can maintain compactness even when the thickness reaches 200-1200 microns. Namely, the existing PFA coating with the size of more than 150 microns needs to solve the problem of bubble inclusion caused by oxidation generated by multiple high-temperature processing in the coating manufacturing process by adding a metal compound which is easy to oxidize when manufacturing the PFA powder coating, thereby achieving the purpose of improving the thickness of the PFA coating. In addition, the PFA coating is prepared by spraying PFA powder coating on the metal surface, forming a film at a high temperature of 360-400 ℃ and melting for multiple times through multiple spraying. Therefore, during the high temperature, the PFA resin is partially oxidized to generate bubbles and disperse contained in the coating, resulting in disqualification and rejection of the coating. In order to solve this problem, a technique of adding a metal compound which is easily oxidized is currently generally used. However, the metal ion elution amount of the PFA coating with the diameter of more than 200 microns obtained by the method is more than PPM level. The purity requirements of the industry such as semiconductors cannot be met. The high-purity PFA, namely the PFA with the metal ion leaching amount below PPB, has wider market application, but the high-purity PFA without adding a metal compound at present cannot be sprayed on the metal surface to more than 200 microns. Disclosure of Invention The metal compound of the application has no added high purity PFA coating, which can be sprayed on the metal surface to more than 200 microns, and can achieve the metal ion leaching amount below PPB. In order to achieve the purpose of the application, the application provides a metal compound non-added high-purity PFA coating, the non-metal ion added high-purity PFA coating comprises: perfluorinated alkoxy resin, namely 50-95 parts of PFA, wherein the PFA is high-purity PFA; 4.5-49.5 parts of at least one regulator selected from PES polyethersulfone, PPS polyphenylene sulfide, PBI polybenzimidazole, PI polyimide or PAI polyamide-imide; Bisphenol A epoxy resin 0.2-0.5, wherein the addition proportion of other components except PFA is more than 10% and less than 30%. According to an embodiment of the present application, PES has an MFR value of 5 to 80 and a particle diameter D50 of 10 to 50. Mu.m. According to an embodiment of the application, PS has an MFR value of 50 to 2000 and a particle diameter D50 of 10 to 50 um. According to an embodiment of the present application, the PBI has an MFR value of 0.1 to 1.0 and a particle diameter D50 of 10 to 50 μm. According to an embodiment of the present application, the PI has an MFR value of 3 to 50 and a particle diameter D50 of 10 to 50 um. According to one embodiment of the present application, the PAI has an MFR value of 0.5 to 6.0 and a particle diameter D50 of 10 to 50 μm. According to an embodiment of the present application, e=0.05 to 0.12 of bisphenol a type epoxy resin. According to an embodiment of the application, the modifier is selected from at least two of PES polyethersulfone, PPS polyphenylene sulfide, PBI polybenzimidazole, PI polyimide or PAI polyamide-imide. Detailed Description The preferred embodiments in the following description are by way of example only and other obvious variations will occur to those skilled in the art. The basic principles of the invention defined in the following description may be applied to other embodiments, variations, modifications, equivalents, and other technical solutions without departing from the spirit and scope of the invention. A high purity PFA coating without metal ion addition in accordance with a preferred embodiment of the present application will be described in detail below. Specifically, the high-purity PFA coating without metal ion addition comprises the following components in percentage by weight: perfl