Search

CN-121991575-A - Charge dissipation coating and preparation method thereof and ceramic product

CN121991575ACN 121991575 ACN121991575 ACN 121991575ACN-121991575-A

Abstract

The application provides a charge dissipation coating, a preparation method thereof and a ceramic product, and belongs to the technical field of ceramics. The charge dissipation coating comprises a resin matrix, a conductive filler, a dispersing and coupling system, a curing agent and a solvent, wherein the resin matrix comprises epoxy resin and polyurethane prepolymer, the conductive filler comprises sheet-shaped conductive filler, epoxy functionalized carbon nanotubes and conductive carbon black, the epoxy functionalized carbon nanotubes are carbon nanotubes of which the surfaces are grafted with glycidol ether oxygen groups or derivative groups thereof, and the dispersing and coupling system comprises a dispersing agent and at least one silane coupling agent. The charge dissipation coating disclosed by the application can form a coating with excellent charge dissipation performance (low surface resistance and short charge half life) and good adhesive force on the surface of a ceramic substrate by reasonably compounding components such as epoxy resin, polyurethane prepolymer, flaky conductive filler, epoxy functionalized carbon nano tube, conductive carbon black and the like and matching with a specific silane coupling agent, titanate coupling agent and dispersing agent.

Inventors

  • WANG CAN
  • XIAO LIANG

Assignees

  • 湖南湘瓷科艺有限公司

Dates

Publication Date
20260508
Application Date
20260407

Claims (10)

  1. 1. A charge dissipative coating comprising the following components: A resin matrix comprising an epoxy resin and a polyurethane prepolymer; The conductive filler comprises a flaky conductive filler, an epoxy functionalized carbon nano tube and conductive carbon black, wherein the epoxy functionalized carbon nano tube is a carbon nano tube of which the surface is grafted with glycidol ether oxygen groups or derivative groups thereof; A dispersing and coupling system comprising a dispersant and at least one silane coupling agent; A curing agent; And (3) a solvent.
  2. 2. The charge dissipation coating according to claim 1, wherein the silane coupling agent is compounded by epoxy silane coupling agent and amino silane coupling agent according to a mass ratio of 1:0.3-0.8; and/or the curing agent is a phenolic amine curing agent.
  3. 3. The charge dissipating coating of claim 1 wherein the conductive filler is a sheet-like conductive filler is a mica sheet having a surface coated with tin oxide.
  4. 4. The charge dissipative coating of claim 1, wherein the dispersion and coupling system further comprises a titanate coupling agent.
  5. 5. A preparation method of a charge dissipation coating is characterized in that, a process for preparing the charge dissipative coating of any of claims 1-4, comprising the steps of: S1, mixing epoxy functionalized carbon nanotubes, a dispersing agent and a first part of solvent, and performing first dispersion treatment to obtain primary dispersion slurry; s2, adding a flaky conductive filler, conductive carbon black and a titanate coupling agent into the primary dispersion slurry, and performing second dispersion treatment to obtain a composite conductive slurry; S3, mixing epoxy resin, polyurethane prepolymer, silane coupling agent and a second part of solvent to obtain a resin mixed solution; S4, mixing the composite conductive paste with the resin mixed solution; And S5, adding the curing agent, mixing, and performing humidity-controlling curing treatment to obtain the charge dissipation coating.
  6. 6. The method of preparing a charge dissipating coating according to claim 5, wherein in step S1, the first dispersing treatment is performed under cooling conditions at a dispersing speed of 4000 to 6000 rpm for 20 to 40 minutes.
  7. 7. The method of preparing a charge dissipating coating according to claim 5, wherein in step S5, the humidity-controlled aging treatment is performed at a temperature of 20 to 30 ℃ and an ambient relative humidity of 40 to 60% for 24 to 72 hours.
  8. 8. A ceramic article coated with a charge dissipative coating on the surface of the ceramic article, the charge dissipative coating being formed by curing the charge dissipative coating of any of claims 1-4 on the surface of a ceramic substrate.
  9. 9. The ceramic article of claim 8, wherein the ceramic substrate is subjected to a silane pre-coupling treatment prior to coating; The treatment fluid used for the silane pre-coupling treatment comprises a silane coupling agent, water, alcohol and a pH regulator.
  10. 10. The ceramic article of claim 8, wherein the method of making the ceramic article comprises: pretreating the surface of a ceramic substrate; Applying the charge dissipating coating of any one of claims 1 to 4 to a pretreated ceramic substrate surface to form a wet film; Step curing is performed on the wet film.

Description

Charge dissipation coating and preparation method thereof and ceramic product Technical Field The application relates to the technical field of ceramics, in particular to a charge dissipation coating, a preparation method thereof and a ceramic product. Background The ceramic material has the advantages of high hardness, wear resistance, corrosion resistance and the like, and is widely applied to the fields of electronics, chemical industry, medical treatment and the like. However, ceramic materials generally have a relatively high surface resistance, and are prone to static buildup, resulting in discharge hazards. In the prior art, the ceramic antistatic treatment mainly adopts a surface metallization method, a conductive phase doping method or an antistatic coating method and the like. However, these methods have problems such as high cost, poor adhesion, easy oxidation, and influence on the transparency or appearance of ceramics. The existing antistatic coating has weak binding force with the ceramic substrate, poor wear resistance and temperature resistance and unstable charge dissipation performance. Therefore, there is a need to develop a coating solution that has strong binding force with ceramic substrates and stable charge dissipation properties. Disclosure of Invention The present application has been made in view of the above problems, and an object thereof is to provide a charge dissipating coating, a method for producing the same, and a ceramic article. In particular, the first aspect of the present application provides a charge dissipative coating comprising the following components: A resin matrix comprising an epoxy resin and a polyurethane prepolymer; The conductive filler comprises a flaky conductive filler, an epoxy functionalized carbon nano tube and conductive carbon black, wherein the epoxy functionalized carbon nano tube is a carbon nano tube of which the surface is grafted with glycidol ether oxygen groups or derivative groups thereof; A dispersing and coupling system comprising a dispersant and at least one silane coupling agent; A curing agent; And (3) a solvent. Further, the silane coupling agent is formed by compounding an epoxy silane coupling agent and an amino silane coupling agent according to the mass ratio of 1:0.3-0.8. Further, the curing agent is a phenolic amine curing agent. Further, in the conductive filler, the sheet-shaped conductive filler is a mica sheet with a tin oxide plated surface. Further, the dispersing and coupling system further comprises a titanate coupling agent. The second aspect of the present application provides a method for preparing a charge dissipative coating comprising the steps of: S1, mixing epoxy functionalized carbon nanotubes, a dispersing agent and a first part of solvent, and performing first dispersion treatment to obtain primary dispersion slurry; s2, adding a flaky conductive filler, conductive carbon black and a titanate coupling agent into the primary dispersion slurry, and performing second dispersion treatment to obtain a composite conductive slurry; S3, mixing epoxy resin, polyurethane prepolymer, silane coupling agent and a second part of solvent to obtain a resin mixed solution; S4, mixing the composite conductive paste with the resin mixed solution; And S5, adding the curing agent, mixing, and performing humidity-controlling curing treatment to obtain the charge dissipation coating. Further, the first dispersing treatment is carried out under the cooling condition, the dispersing rotating speed is 4000-6000 rpm, and the time is 20-40 minutes. Further, the environment relative humidity of the humidity-controlled curing treatment is 40-60%, the temperature is 20-30 ℃ and the time is 24-72 hours. In a third aspect, the present application provides a ceramic article having a charge-dissipative coating applied to a surface of the ceramic article, the charge-dissipative coating being formed by curing the charge-dissipative coating on a surface of a ceramic substrate. Further, the ceramic substrate is subjected to silane pre-coupling treatment before coating; The treatment fluid used for the silane pre-coupling treatment comprises a silane coupling agent, water, alcohol and a pH regulator. Further, the preparation method of the ceramic product comprises the following steps: pretreating the surface of a ceramic substrate; applying the charge dissipating coating to the pretreated ceramic substrate surface to form a wet film; Step curing is performed on the wet film. Further, the step curing includes: the first stage is to carry out gradient temperature rising gel at 40-65 ℃; the second stage is to cure at 80-95 deg.c; and in the third stage, high-temperature curing is carried out at 100-120 ℃. Further, after the third stage is completed, the method further comprises cooling to below 60 ℃ at a rate of not more than 1.5 ℃ per minute. The invention has the following beneficial effects: according to the invention, the epoxy resin and the pol