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CN-121379351-B - Nano ceramic ultra-high hardness powder coating and preparation method thereof

CN121379351BCN 121379351 BCN121379351 BCN 121379351BCN-121379351-B

Abstract

The invention discloses a nano ceramic ultra-high hardness powder coating and a preparation method thereof, belonging to the technical field of powder coating preparation. The nano ceramic ultra-high hardness powder coating comprises, by weight, 10-20 parts of aluminum oxide, 4-12 parts of zirconium oxide, 5-14 parts of silicon carbide, 2-8 parts of titanium dioxide, 3-7 parts of a composite organic auxiliary agent, 53-65 parts of a composite resin, 0.5-1.3 parts of a dispersing agent, 1-2 parts of absolute ethyl alcohol, 1-4 parts of a leveling agent and 0.4-2.4 parts of a coupling agent. The coating prepared by the method has excellent hardness, chemical corrosion resistance, wear resistance and easy cleaning performance.

Inventors

  • KANG XIAOBING
  • WANG SHIYONG
  • DAI ZHENHUA

Assignees

  • 广东桑瑞斯环保新材料有限公司

Dates

Publication Date
20260512
Application Date
20251124

Claims (8)

  1. 1. The nano ceramic ultra-high hardness powder coating is characterized by comprising, by weight, 10-20 parts of aluminum oxide, 4-12 parts of zirconium oxide, 5-14 parts of silicon carbide, 2-8 parts of titanium dioxide, 3-7 parts of a composite organic auxiliary agent, 53-65 parts of a composite resin, 0.5-1.3 parts of a dispersing agent, 1-2 parts of absolute ethyl alcohol, 1-4 parts of a leveling agent and 0.4-2.4 parts of a coupling agent; The preparation method of the composite organic auxiliary agent comprises the following steps: Q1, adding 3- (perfluoro-5-methyl hexyl) -2-hydroxypropyl methacrylate, lauryl methacrylate, 3-mercaptopropyl triethoxysilane and azodiisobutyronitrile into a container filled with tetrahydrofuran, introducing argon, heating for reaction, performing rotary evaporation, precipitation and vacuum drying after the reaction is finished to obtain colorless transparent liquid 1; Q2, adding gamma-glycidol ether oxypropyl trimethoxy silane, distilled water and hydrochloric acid into a container filled with ethanol, heating and stirring for reaction under the argon atmosphere, then sequentially adding colorless transparent liquid 1, distilled water and hydrochloric acid, continuously stirring for reaction, and after the reaction is finished, performing rotary evaporation and drying to obtain a composite organic aid; The preparation method of the composite resin comprises the following steps: S1, adding 2-chloro-5-nitrobenzaldehyde, 4' -difluorobenzil and ammonium acetate into a container for holding acetic acid in a nitrogen environment, heating, stirring for reaction, condensing and refluxing, cooling, filtering, washing and recrystallizing to obtain an organic matter a; S2, adding the organic matter a, potassium carbonate and p-nitrophenol into a container filled with N, N-dimethylformamide, heating and stirring for reaction, cooling after the reaction is finished, adding deionized water, carrying out suction filtration, washing, and filtering while the mixture is hot to obtain an organic matter b; S3, adding the organic matter b into ethanol in a nitrogen environment, stirring and mixing, adding Pd/C, heating and stirring, adding hydrazine hydrate, stirring and mixing, carrying out reflux reaction, filtering while the reaction is hot, steaming in a rotary manner, and recrystallizing to obtain an organic matter C; And S4, adding the organic matter c into a container filled with N-methyl pyrrolidone, stirring and mixing, adding 2,2' -bis (3, 4-dicarboxylic acid) hexafluoropropane dianhydride, reacting, and heating to obtain the composite resin.
  2. 2. The nano ceramic ultra-high hardness powder coating according to claim 1, wherein the dosage ratio of 3- (perfluoro-5-methyl hexyl) -2-hydroxypropyl methacrylate, lauryl methacrylate, 3-mercaptopropyl triethoxysilane, azobisisobutyronitrile and tetrahydrofuran in Q1 is (3.88-4.12) g (4.12-5.35) g (1.01-1.39) g (0.01-0.03) g (10-20) mL.
  3. 3. The nano ceramic ultra-high hardness powder coating according to claim 1, wherein the dosage ratio of gamma-glycidoxypropyl trimethoxysilane to colorless transparent liquid 1 in Q2 is (21.12-25.45) g (8.72-9.32) g.
  4. 4. The nano ceramic ultra-high hardness powder coating according to claim 1, wherein the amount ratio of 2-chloro-5-nitrobenzaldehyde, 4' -difluorobenzil, ammonium acetate and acetic acid in S1 is (1.483-2.048) g (2.122-2.894) g (5.121-5.483) g (25-35) mL.
  5. 5. The nano ceramic ultra-high hardness powder coating according to claim 1, wherein in S2, the dosage ratio of organic matter a, potassium carbonate, p-nitrophenol and N, N-dimethylformamide is (4.88-5.32) g (1.988-2.046) g (1.923-2.114) g (48-52) mL.
  6. 6. The nano ceramic ultra-high hardness powder coating according to claim 1, wherein in S3, the ratio of the organic matter b, ethanol, pd/C and hydrazine hydrate is (5.48-6.41) g (125-178) mL (0.532-0.688) g (23-28) mL.
  7. 7. The nano ceramic ultra-high hardness powder coating according to claim 1, wherein in S4, the ratio of organic c, N-methylpyrrolidone and 2,2' -bis (3, 4-dicarboxylic acid) hexafluoropropane dianhydride is (2.12-2.78) g, (20-30) mL, (4.23-4.66) g.
  8. 8. The method for preparing the nano ceramic ultra-high hardness powder coating according to any one of claims 1 to 7, comprising the steps of: sequentially adding aluminum oxide, zirconium oxide, silicon carbide and titanium dioxide into a vacuum drying oven, drying, diluting a coupling agent with absolute ethyl alcohol, spraying the coupling agent on the surface of the pretreated powder, and mixing and stirring to obtain pretreated powder; step two, mixing and stirring the composite organic auxiliary agent, the composite resin, the dispersing agent and the leveling agent to obtain a composite mixed auxiliary agent; And thirdly, adding the pretreated powder and the composite mixing auxiliary agent into a container, mixing, melt-extruding, plasticizing, cooling, crushing and screening to obtain the nano ceramic ultra-high hardness powder coating.

Description

Nano ceramic ultra-high hardness powder coating and preparation method thereof Technical Field The invention belongs to the technical field of powder coating preparation, and particularly relates to a nano ceramic ultra-high hardness powder coating and a preparation method thereof. Background In the field of industrial protection and surface treatment, traditional coating technology has long faced performance bottlenecks. Although the conventional products represented by the organic coating are widely applied, the essential defects of the conventional products are increasingly remarkable, namely unsaturated bonds in the molecular structure of the organic component are easily damaged by ultraviolet rays and oxidation, so that the weather resistance is obviously reduced, and frequent maintenance is often needed for outdoor use. More seriously, in extreme working conditions such as aerospace, energy chemical industry and the like, the traditional coating is difficult to bear high-temperature baking or is rapidly invalid under the corrosion of strong acid, strong alkali and salt fog, so that the protection life is greatly shortened. Although engineering ceramic coating has certain high temperature resistance and corrosion resistance, the problems of high brittleness and low bonding strength limit the application of complex curved surfaces. Under the background, the nano ceramic ultra-high hardness powder coating is produced by uniformly dispersing nano ceramic particles and sintering by a special process, so that a composite structure with ceramic hardness and metal toughness is formed, the performance limit of the traditional material in an extreme environment is effectively broken through, and the composite structure becomes a key technical breakthrough direction in the field of high-end equipment protection. Patent CN118791894B discloses a nano ceramic coating, a nano ceramic coating and a preparation method and application thereof, and relates to the technical field of coating materials, wherein the nano ceramic coating comprises a silica sol solution, polysiloxane and an additive, the additive comprises a filler, and the filler is nano powder, wherein the weight ratio of the silica sol solution to the polysiloxane to the additive is 1:0.5-0.8:1-2. The invention takes silica sol and polysiloxane as film forming agent, and reduces the overlarge tensile stress caused by the shrinkage of the bond between the sol particle and the surface of the substrate by the condensation and crosslinking of the silica sol and the polysiloxane, so as to avoid the self-cracking of the formed coating, and simultaneously, takes nano powder as filler, can fill the molecular gap after the dehydration and condensation of the silica sol, and is used for strengthening the relatively formed coating with a net structure for pinning, thereby improving the compactness of the coating, ensuring that the formed coating has no microcrack, avoiding greasy dirt and oil dirt from remaining in the coating, and ensuring good easy cleaning property and durable long-acting property. Although the compactness of the coating is obviously improved through polycondensation and crosslinking of silica sol and polysiloxane and nano powder filler, the nano powder filler has optimizing potential in the aspects of hardness, high temperature resistance, weather resistance and the like, the type and the particle size distribution of the nano powder filler can not be completely matched with a crosslinked network structure at present, so that the strengthening effect does not reach the theoretical limit, the chemical bond stability of a crosslinking agent system at high temperature is enhanced to a limited extent, the long-term heat resistance depends on the modification depth of a basic film forming agent, and an active protection mechanism aiming at ultraviolet rays and oxidizing atmosphere is lacked, and photocatalytic degradation and microcrack expansion can still occur in the outdoor aging process. Disclosure of Invention The invention aims to provide a nano ceramic ultra-high hardness powder coating and a preparation method thereof, which are used for solving the technical problems of poor hardness, high temperature resistance and easy cleaning performance of the powder coating in the prior art. In order to achieve the above purpose, the present invention adopts the following technical scheme: The invention provides a nano ceramic ultra-high hardness powder coating which comprises, by weight, 10-20 parts of aluminum oxide, 4-12 parts of zirconium oxide, 5-14 parts of silicon carbide, 2-8 parts of titanium dioxide, 3-7 parts of a composite organic auxiliary agent, 53-65 parts of a composite resin, 0.5-1.3 parts of a dispersing agent, 1-2 parts of absolute ethyl alcohol, 1-4 parts of a leveling agent and 0.4-2.4 parts of a coupling agent. Preferably, the preparation method of the composite organic auxiliary agent comprises the following steps: Q1, adding 3- (