Search

CN-121991572-A - Antistatic powder coating and preparation process thereof

CN121991572ACN 121991572 ACN121991572 ACN 121991572ACN-121991572-A

Abstract

The application belongs to the technical field of powder coatings, and particularly provides an antistatic powder coating and a preparation process thereof. The antistatic powder coating comprises a modified epoxy resin, a curing agent, a composite conductive filler, a leveling agent, a defoaming agent and a pigment filler, wherein the modified epoxy resin is prepared from indole modified epoxy resin, the composite conductive filler is prepared from a carbon nano tube and a hyperbranched functional polymer, and the hyperbranched functional polymer is prepared from hydroxyl-terminated hyperbranched polyester, pyrenebutyric acid, amino-terminated polyethylene glycol and carboxyl triazoline dione. The antistatic powder coating prepared by the application has good antistatic, adhesive force and self-repairing performance.

Inventors

  • YANG QINGWEI
  • JIE MI
  • XU KAIHENG
  • FANG BIN

Assignees

  • 浙江超浪新材料有限公司

Dates

Publication Date
20260508
Application Date
20260410

Claims (10)

  1. 1. The antistatic powder coating is characterized by comprising, by weight, 35-60 parts of modified epoxy resin, 2-3 parts of a curing agent, 5-20 parts of a composite conductive filler, 0.7-1.5 parts of a leveling agent, 0.3-1 part of a defoaming agent and 10-30 parts of a pigment filler; the modified epoxy resin is prepared from indole modified epoxy resin; the composite conductive filler is prepared from carbon nanotubes and hyperbranched functional polymers; The hyperbranched functional polymer is prepared from hydroxyl-terminated hyperbranched polyester, pyrene butyric acid, amino-terminated polyethylene glycol and carboxyl triazolin dione.
  2. 2. The antistatic powder coating according to claim 1, wherein the preparation method of the modified epoxy resin comprises the following steps of reacting epoxy resin, 5-methoxy tryptamine and N, N-dimethyl-1, 6-hexamethylenediamine.
  3. 3. The antistatic powder coating according to claim 1, wherein the preparation method of the composite conductive filler comprises the steps of ultrasonic dispersion and compounding of carbon nanotubes and hyperbranched functional polymers in a solvent, and separation and drying.
  4. 4. An antistatic powder coating according to claim 3, wherein the mass ratio of carbon nanotubes to hyperbranched functional polymers is 1:3-5.
  5. 5. The antistatic powder coating according to claim 1 is characterized in that the preparation method of the hyperbranched functional polymer comprises the following steps of A1, performing an amide condensation reaction on amino-terminated polyethylene glycol and pyrene butyric acid to obtain pyrene butyric acid-polyethylene glycol, A2, performing an amide condensation reaction on pyrene butyric acid-polyethylene glycol and carboxyl triazolin dione to obtain pyrene butyric acid-polyethylene glycol-triazolin dione, and A3, performing an esterification reaction on hydroxyl-terminated hyperbranched polyester and pyrene butyric acid-polyethylene glycol-triazolin dione to obtain the hyperbranched functional polymer.
  6. 6. The antistatic powder coating according to claim 5, wherein the preparation method of the amino-terminated polyethylene glycol in A1 comprises the steps of B1, reacting polyethylene glycol with TsCl to obtain polyethylene glycol p-toluenesulfonate, and refluxing B2, reacting polyethylene glycol p-toluenesulfonate with concentrated nitric acid to obtain the amino-terminated polyethylene glycol.
  7. 7. The antistatic powder coating according to claim 5, wherein the preparation method of carboxyl triazolin dione in A2 comprises the steps of heating and stirring diphenyl carbonate and ethyl carbamate to react to obtain dicarboxylic acid ethyl phenylhydrazine, catalytically reacting C2, L-glutamic acid-5-tertiary butyl ester and dicarboxylic acid ethyl phenylhydrazine with triethylamine to obtain semicarbazide, cyclizing the semicarbazide with N 2 O 4 to obtain tertiary butyl protected carboxyl triazolin dione in sequence K 2 CO 3 、MgSO 4 , and removing tertiary butyl protected carboxyl triazolin dione from tertiary butyl protected carboxyl triazolin dione in C4, tertiary butyl protected carboxyl triazolin dione in presence of trifluoroacetic acid and dichloromethane.
  8. 8. The antistatic powder coating according to claim 5, wherein the preparation method of the hydroxyl-terminated hyperbranched polyester in A3 comprises the following steps of preparing the hydroxyl-terminated hyperbranched polyester by DCC (direct catalytic reaction) of trimethylolpropane and 2, 2-dimethylolpropionic acid.
  9. 9. A method for preparing the antistatic powder coating according to any one of claims 1 to 8, which comprises the steps of S1, dry-mixing the composite conductive filler and pigment filler, adding the rest components into a high-speed mixer for premixing, S2, adding the mixture into a double-screw extruder to form a uniform melt after mixing, S3, adding the molten coating into a pelleter to prepare a sheet, adding the sheet material into a grinding hopper for grinding and crushing, and classifying and sieving to prepare the antistatic powder coating.
  10. 10. The process for preparing an antistatic powder coating according to claim 9, wherein in S2, the temperature of each section of the twin-screw extruder is controlled to 100-110 ℃, wherein the temperature of the feeding section is set to 100-105 ℃, and the temperature of the middle section and the die section are gradually increased to 105-110 ℃.

Description

Antistatic powder coating and preparation process thereof Technical Field The application belongs to the technical field of powder coatings, and particularly relates to an antistatic powder coating and a preparation process thereof. Background The powder coating is used as a surface treatment material without Volatile Organic Compounds (VOC), gradually replaces the traditional solvent type coating by virtue of excellent environmental protection performance and construction efficiency, and is widely applied to the fields of buildings, terraces, furniture, electronic appliances and the like. The demand for functionalization of powder coatings has become increasingly prominent in recent years, with antistatic functions becoming one of the key demands. The antistatic powder paint is prepared by adding conductive fillers into paint, and forming continuous conductive network by the conductive fillers contacting each other to form conductive channels. The conductive filler is usually made of conductive carbon fiber, metal filler, graphite powder, conductive mica and the like, and needs a sufficient filling amount to form a conductive chain, but the excessive filling amount is easy to cause uneven dispersion and distribution, and meanwhile, in the long-term use process, the conductive filler is influenced by factors such as temperature change, mechanical vibration, chemical media, wet and hot environment and the like, micro cracks or stripping are easy to occur at the interface between the filler and the resin, separation is caused, and the conductive network is broken, so that the conductive performance is greatly weakened. In order to solve the problem of reduced antistatic performance of antistatic paint after long-term use, the technology of modifying the surface of filler, doping conductive resin and the like is adopted. For example, patent application document CN108977000a discloses an antistatic powder coating, and the antistatic powder coating in the application adopts polyamide resin and silane coupling agent to modify carbon black, so that the compatibility of carbon black and resin matrix is effectively improved, and the prepared antistatic protective layer is well bonded and does not fall off. The impact resistance of the antistatic protective layer can be effectively improved by adding polyester resin for compounding and modifying the surface of the carbon black material, and meanwhile, the antistatic protective layer can play a role in effective antistatic protection, but the antistatic protective layer is not modified for weakening of conductive performance caused by cracks or interface separation of a filler and the resin in a long-term use environment. Disclosure of Invention Aiming at the problems, the application provides an antistatic powder coating and a preparation process thereof in order to further improve the permanent antistatic performance of the antistatic powder. The application provides an antistatic powder coating which comprises, by weight, 35-60 parts of modified epoxy resin, 2-3 parts of a curing agent, 5-20 parts of a composite conductive filler, 0.7-1.5 parts of a leveling agent, 0.3-1 part of a defoaming agent and 10-30 parts of a pigment filler; the modified epoxy resin is prepared from indole modified epoxy resin; the composite conductive filler is prepared from carbon nanotubes and hyperbranched functional polymers; The hyperbranched functional polymer is prepared from hydroxyl-terminated hyperbranched polyester, pyrene butyric acid, amino-terminated polyethylene glycol and carboxyl triazolin dione. Further, the preparation method of the modified epoxy resin comprises the following steps of reacting epoxy resin, 5-methoxy tryptamine and N, N-dimethyl-1, 6-hexamethylenediamine. Further, the preparation method of the composite conductive filler comprises the following steps of ultrasonic dispersion and compounding of the carbon nano tube and the hyperbranched functional polymer in a solvent, and separation and drying. Further, the mass ratio of the carbon nano tube to the hyperbranched functional polymer is 1:3-5. The preparation method of the hyperbranched functional polymer comprises the following steps of A1, carrying out an amide condensation reaction on amino-terminated polyethylene glycol and pyrene butyric acid to obtain pyrene butyric acid-polyethylene glycol, A2, carrying out an amide condensation reaction on pyrene butyric acid-polyethylene glycol and carboxyl triazolin dione to obtain pyrene butyric acid-polyethylene glycol-triazolin dione, and A3, carrying out an esterification reaction on hydroxyl-terminated hyperbranched polyester and pyrene butyric acid-polyethylene glycol-triazolin dione to obtain the hyperbranched functional polymer. Further, the preparation method of the amino-terminated polyethylene glycol comprises the following steps of B1, reacting polyethylene glycol with TsCl to obtain polyethylene glycol p-toluenesulfonate, and B2, carrying out reflux r