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CN-122011862-A - Lathe machining aluminum scraps scratch resistant coating for motorcycle hub and preparation process thereof

CN122011862ACN 122011862 ACN122011862 ACN 122011862ACN-122011862-A

Abstract

The invention provides a lathe machining aluminum scraps scratch resistant coating for a motorcycle hub and a preparation process thereof, belonging to the technical field of coatings, and comprising the following steps of S1, preparing silicon zirconium hybrid sol; step S2, preparing epoxy modified prepolymer solution, step S3, adding hydroxyl acrylic resin solution into a reaction kettle, stirring, adding butyl acetate and sec-butyl acetate, stirring, adding hexamethoxymethyl melamine, epoxy modified prepolymer solution, BYK4510, organic bentonite and propylene carbonate, stirring, adding silicon zirconium hybrid sol, stirring, adding BYK333, BYK-066N, polyethylene micro powder wax and PTFE micro powder, stirring at a reduced speed, finally adding aluminum paste mixture, mixing uniformly, and filtering to obtain the anti-aluminum chip scratch coating for the motorcycle hub. The invention can realize the purposes of scratch resistance, stripping resistance and good appearance maintenance of the lathe machine and aluminum scraps scratch resistant coating for the motorcycle hub.

Inventors

  • FANG JUNYI
  • LIN ZHIYUAN
  • WANG ZHIHAO
  • GAO LONG
  • LIU XU

Assignees

  • 江苏四方威凯科技有限公司

Dates

Publication Date
20260512
Application Date
20260408

Claims (10)

  1. 1. The preparation process of the lathe machine-added aluminum scraps scratch resistant coating for the motorcycle hub is characterized by comprising the following steps of: Step S1, adding zirconium n-propoxide and acetylacetone into n-butanol to obtain a zirconium complex solution, slowly dripping the zirconium complex solution into a silica sol precursor, stirring, aging and filtering to obtain a silica zirconium hybrid sol; s2, adding bisphenol A epoxy resin and butyl acetate into a reaction kettle, heating, stirring and dissolving, adding adipic acid and zinc acetylacetonate for reaction, and filtering to obtain an epoxy modified prepolymer solution; And S3, adding the hydroxy acrylic resin solution into a reaction kettle, stirring, adding butyl acetate and sec-butyl acetate, stirring, adding hexamethoxymethyl melamine, epoxy modified prepolymer solution, BYK4510, organic bentonite and propylene carbonate, stirring, adding silicon zirconium hybrid sol, stirring, adding BYK333, BYK-066N, polyethylene micro powder wax and PTFE micro powder, stirring at a reduced speed, finally adding aluminum silver paste mixture, uniformly mixing, and filtering to obtain the anti-aluminum chip scratch coating for the motorcycle hub.
  2. 2. The process for preparing the lathe-machining aluminum chip scratch resistant coating for the motorcycle hub, which is disclosed in claim 1, is characterized in that the aging time is 12-24 hours.
  3. 3. The process for preparing the lathe machining aluminum scrap scratch resistant coating for the motorcycle hub according to claim 1, wherein the preparation of the silica sol precursor comprises the following steps of: mixing KH560, methyltrimethoxysilane and n-butanol to obtain a mixed solution, mixing deionized water, glacial acetic acid and n-butanol to obtain a hydrolysate, dripping the hydrolysate into the mixed solution, and continuing stirring after dripping to obtain the silica sol precursor.
  4. 4. The process for preparing the lathe machine aluminum chip scratch resistant coating for the motorcycle hub, which is disclosed in claim 1, is characterized in that in the step S2, the epoxy equivalent of bisphenol A type epoxy resin is 450-550g/eq, the temperature of heating and stirring is 110-120 ℃, the reaction temperature is 130-140 ℃ and the time is 120-180min.
  5. 5. The preparation process of the lathe machine aluminum chip scratch resistant coating for the motorcycle hub is characterized by comprising the following steps of adding aluminum paste, butyl acetate and sodium polyacrylate into a reaction kettle, and stirring uniformly to obtain the aluminum paste mixture, wherein the aluminum paste mixture comprises, by weight, 55-66 parts of aluminum paste, 25-30 parts of butyl acetate and 0.3-0.36 part of sodium polyacrylate.
  6. 6. The process for preparing a lathe machine aluminum chip scratch resistant coating for a motorcycle hub according to claim 1, wherein the solid content of the hydroxy acrylic resin solution is 59-61wt%, the Tg is 55-65 ℃, and the average molecular weight is 8000-12000.
  7. 7. The preparation process of the lathe machine aluminum scrap scratch resistant coating for the motorcycle hub, which is disclosed in claim 1, is characterized in that in the step S3, double-wall microcapsule powder is added before the aluminum paste mixture is added for stirring, and the preparation of the double-wall microcapsule powder comprises the following steps: Adding polysulfone into NMP, stirring to clear, adding 1-ethyl-3-methylimidazole diethyl phosphate, continuously stirring to obtain an internal phase, placing PVA water solution into an emulsifying kettle, dripping the internal phase under high shearing condition to obtain emulsion, regulating the rotating speed, slowly adding deionized water, stirring, centrifuging, washing, transferring into ethanol solution, adding ammonia water, uniformly stirring, dripping TEOS for reaction, filtering, washing, and drying to obtain double-wall microcapsule powder.
  8. 8. The process for preparing the lathe-machining aluminum chip scratch resistant coating for the motorcycle hub, which is disclosed in claim 7, is characterized in that the rotating speed of the high shearing condition is 8000-10000rpm, the rotating speed after adjustment is 400-600rpm, the concentration of ammonia water is 25-28wt%, the concentration of PVA aqueous solution is 1-1.5wt%, and the concentration of ethanol solution is 75-85wt%.
  9. 9. The preparation process of the lathe machining aluminum chip scratch resistant coating for the motorcycle hub, which is disclosed in claim 7, is characterized in that the double-wall microcapsule powder comprises, by weight, 10-12 parts of polysulfone, 88-90 parts of NMP and 18-25 parts of 1-ethyl-3-methylimidazole diethyl phosphate, and further comprises, by volume, 500 parts of PVA aqueous solution, 300-400 parts of deionized water, 400 parts of ethanol solution, 1-1.5 parts of ammonia water and 6-10 parts of TEOS.
  10. 10. The lathe machine aluminum scrap scratch resistant coating for the motorcycle hub is prepared by adopting the preparation process of the lathe machine aluminum scrap scratch resistant coating for the motorcycle hub according to any one of claims 1 to 9, and is characterized by comprising the following components in parts by weight: 289-359 parts of hydroxy acrylic resin, 130-156 parts of hexamethoxymethyl melamine, 45-54 parts of epoxy modified prepolymer solution, 71.5-85.8 parts of butyl acetate, 50-60 parts of sec-butyl acetate, 55-66 parts of silicon zirconium hybrid sol, 21.6 parts of BYK4510 18-21.6 parts of organic bentonite 12-14.4 parts, 1.2-1.44 parts of propylene carbonate, 2.5-3 parts of BYK333, 2-2.4 parts of BYK-066N, 25-30 parts of polyethylene micro powder wax, 10-12 parts of PTFE micro powder and 80.3-96.36 parts of aluminum silver paste mixture.

Description

Lathe machining aluminum scraps scratch resistant coating for motorcycle hub and preparation process thereof Technical Field The invention relates to the technical field of coatings, in particular to a lathe machining aluminum scraps scratch resistant coating for a motorcycle hub and a preparation process thereof. Background The motorcycle hubs are generally prepared from aluminum alloy materials, and the appearance decoration and corrosion resistance of the motorcycle hubs have important influences on the quality and market acceptance of the whole motorcycle. In order to obtain metallic texture, luster and weather-proof and corrosion-proof protection, solvent-type or powder-type coating systems (such as acrylic acid/polyester resin and amino resin are baked and crosslinked, or metallic flash coating and finishing varnish) are commonly adopted in the industry to form a decorative protection film with certain hardness, adhesive force and wear resistance. In the hub manufacturing process, lathe/CNC machining (such as end face finish turning, inner and outer circle trimming, chamfering and the like) is often needed to ensure the dimensional accuracy and the assembly requirement. A large amount of slender or flaky aluminum scraps are generated in the machining process, the edges of the aluminum scraps are sharp and high in hardness, the aluminum scraps can be in instantaneous high-pressure contact, sliding and ploughing or repeated scraping with the coated surface under the action of cutting force, and meanwhile, the aluminum scraps are easy to carry cutting fluid, dust and oxide particles, so that the biting scratch and surface pollution are further aggravated. The scratch is different from the common abrasion, and is often expressed as deep groove, obvious scratch, metal effect damage, local blushing or gloss sudden drop, and the crack expansion of the edge of a coating film can be induced when the scratch is serious, so that the subsequent failure problems of stripping, peeling, corrosive medium infiltration and the like are caused. In the prior art, common means for improving the scratch resistance include improving the crosslinking density of a coating film to obtain higher hardness, introducing inorganic filler or nano particles (such as silicon dioxide, aluminum oxide, zirconium oxide and the like) into a system to enhance the surface anti-indentation capability, adding low-friction solid lubricating phases such as wax powder, PTFE and the like to reduce the friction coefficient, or adopting sol-gel inorganic network/organic resin hybridization to improve the wear resistance and the scratch resistance. However, the scheme has the limitation when facing the harsh working condition of sharp ploughing of aluminum scraps, on one hand, the simple increase of hardness and crosslinking density easily leads to embrittlement and increase of internal stress of a coating film, stress whitening, edge breakage and crack expansion are more likely to occur during scratching, and the interface peeling resistance of an aluminum alloy substrate is likely to be reduced, on the other hand, if an inorganic particle or sol system is not well controlled in a dispersed manner, agglomeration is likely to occur, hard spots/particle defects are formed, microprotrusions and stress concentration sources are generated on the surface of the coating film, and the coating film becomes a preferential damage position under the action of the aluminum scraps, so that the scratches are more remarkable and the appearance is poorer. In addition, in practical production, construction viscosity window, storage stability and appearance retention after baking and curing are required to be considered, so that the comprehensive balance of high-hardness scratch resistance and toughness/adhesion/appearance is more difficult to realize. Therefore, it is necessary to provide a lathe machine-added aluminum scraps scratch resistant coating for a motorcycle hub and a preparation process thereof, so as to solve the problems in the prior art. Disclosure of Invention In view of the above, the invention provides a lathe machine aluminum scrap scratch resistant coating for a motorcycle hub and a preparation process thereof, which can realize the purposes of scratch resistance, peeling resistance and good appearance maintenance of the lathe machine aluminum scrap scratch resistant coating for the motorcycle hub. In order to achieve the aim, the invention provides a preparation process of a lathe machining aluminum scrap scratch resistant coating for a motorcycle hub, which comprises the following steps of: Step S1, adding zirconium n-propoxide and acetylacetone into n-butanol to obtain a zirconium complex solution, slowly dripping the zirconium complex solution into a silica sol precursor, stirring, aging and filtering to obtain a silica zirconium hybrid sol; s2, adding bisphenol A epoxy resin and butyl acetate into a reaction kettle, heating, stirring and disso