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CN-121362516-B - Wear-resistant UV (ultraviolet) bright protective coating for electrochemical aluminum foil and preparation method thereof

CN121362516BCN 121362516 BCN121362516 BCN 121362516BCN-121362516-B

Abstract

The invention provides a wear-resistant UV (ultraviolet) bright protective coating for an electrochemical aluminum foil and a preparation method thereof. The coating comprises the following raw materials, by weight, 40-50 parts of polyurethane acrylate resin, 15-25 parts of fluorine modified acrylic resin, 20-30 parts of reactive diluent, 5-15 parts of inorganic filler, 2-7 parts of photoinitiator, 2-5 parts of silane coupling agent, 1-3 parts of flatting agent and 1-3 parts of antioxidant. The coating has good wear resistance, scratch resistance, temperature resistance, glossiness and weather resistance when in use, can be used as an electrochemical aluminum foil protective layer, improves the durability of products, can be applied to an ink protective layer of an IMD decorative film, and improves the high temperature resistance of the products. The preparation method of the coating disclosed by the invention has the advantages of stable process, convenience in control and high production efficiency, and is beneficial to industrial production.

Inventors

  • XUE MENG
  • LV XINGJUN
  • WU MINDA
  • CHEN JUN
  • ZHANG YAFEI
  • WEI YISONG

Assignees

  • 广东邦固化学科技有限公司

Dates

Publication Date
20260512
Application Date
20251127

Claims (10)

  1. 1. The wear-resistant UV bright protective coating for the electrochemical aluminum foil is characterized by comprising the following raw materials, by weight, 40-50 parts of polyurethane acrylate resin, 15-25 parts of fluorine modified acrylic resin, 20-30 parts of reactive diluent, 5-15 parts of inorganic filler, 2-7 parts of photoinitiator, 2-5 parts of silane coupling agent, 1-3 parts of antioxidant and 1-3 parts of leveling agent, wherein the preparation method of the fluorine modified acrylic resin comprises the following steps: Under the protection of nitrogen, methyl methacrylate, isooctyl acrylate, hydroxyethyl methacrylate, hexafluoro butyl methacrylate, gamma-methacryloxypropyl trimethoxy silane, methacrylic acid and poly (1, 4-butanediol) glycol are added into a solvent, and then an initiator and dodecyl mercaptan are added and uniformly mixed to obtain a premix solution for later use; And B2, after the dropwise adding of the premix is finished, carrying out heat preservation reaction, adding an initiator and a solvent, heating to 95-105 ℃, cooling to below 40 ℃ after the reaction is finished, and discharging to obtain the fluorine modified acrylic resin.
  2. 2. The abrasion-resistant UV-bright protective coating for electrochemical aluminum foil according to claim 1, wherein the preparation method of the urethane acrylate resin comprises the following steps: A1, adding polyol into a reaction container under the protection of nitrogen, heating, dropwise adding polyisocyanate so that the molar ratio of-OH of the polyol to-NCO of the polyisocyanate is 1:1.7-2.1, adding a catalyst after the dropwise adding, and stopping reacting when the measured-NCO reaches 1.1-1.2 times of the theoretical residual value of initial feeding to obtain a mixture A; A2, cooling the mixture A, adding a polymerization inhibitor and a solvent, dropwise adding a hydroxyl-containing acrylate monomer to ensure that the molar ratio of-OH to the residual-NCO groups in the mixture A is 1:1-1.15, heating after the dropwise adding is finished, and reacting until the residual-NCO amount is less than or equal to 0.1%; and A3, cooling the reaction system to room temperature to obtain the polyurethane acrylate resin.
  3. 3. The abrasion-resistant UV-light protective coating for an electrochemical aluminum foil according to claim 2, wherein in step A2, the hydroxyl-containing acrylate monomer is at least one of hydroxyethyl acrylate, hydroxypropyl acrylate, hydroxydodecyl acrylate, hydroxyethyl methacrylate, hydroxypropyl methacrylate and hydroxydecyl methacrylate.
  4. 4. The abrasion-resistant UV-light protective coating for electrochemical aluminum foil according to claim 1, wherein the reactive diluent is at least one of isobornyl acrylate, caprolactone acrylate, 1, 6-hexanediol diacrylate, trimethylolpropane triacrylate and pentaerythritol triacrylate.
  5. 5. The abrasion-resistant UV-bright protective coating for an electrochemical aluminum foil according to claim 1, wherein the inorganic filler is at least one of nano silica, nano alumina and nano titania.
  6. 6. The abrasion-resistant UV-light protective coating for electrochemical aluminum foil according to claim 1, wherein the photoinitiator is at least one of 2,4, 6-trimethylbenzoyl diphenyl phosphine oxide, phenyl bis (2, 4, 6-trimethylbenzoyl) phosphine oxide and 1-hydroxycyclohexyl phenyl ketone.
  7. 7. The wear-resistant UV-light protective coating for electrochemical aluminum foil according to claim 1, wherein the silane coupling agent is at least one of gamma-methacryloxypropyl trimethoxysilane, gamma-glycidoxypropyl trimethoxysilane and gamma-aminopropyl triethoxysilane.
  8. 8. The wear-resistant UV-light protective coating for electrochemical aluminum foil according to claim 1, wherein the antioxidant is at least one of hindered phenol antioxidants, phosphite antioxidants and thioester antioxidants.
  9. 9. The wear-resistant UV-bright protective coating for electrochemical aluminum foil according to claim 1, wherein the leveling agent is at least one leveling agent selected from the group consisting of organosilicon polyethers, acrylic esters and fluorocarbons.
  10. 10. The method for preparing the wear-resistant UV-bright protective coating for the electrochemical aluminum foil according to any one of claims 1 to 9, which is characterized by comprising the following steps: (1) Mixing polyurethane acrylic resin and fluorine modified acrylic resin, heating and stirring uniformly, then adding inorganic filler, silane coupling agent, antioxidant and leveling agent, and mixing uniformly to obtain a first material; (2) And adding the reactive diluent and the photoinitiator into the first material, and uniformly mixing to obtain the wear-resistant UV bright light protective coating for the electrochemical aluminum foil.

Description

Wear-resistant UV (ultraviolet) bright protective coating for electrochemical aluminum foil and preparation method thereof Technical Field The invention relates to the technical field of coatings, in particular to a wear-resistant UV (ultraviolet) bright protective coating for electrochemical aluminum foil and a preparation method thereof. Background The electrochemical aluminum foil is used as a common decorative film material, and has the advantages of good appearance effect, good decoration, difficult fading, good durability and the like, and has been widely applied to the fields of package printing, household appliances, 3C electronic products, anti-counterfeiting labels, certificate illumination and the like. The electrochemical aluminum foil can be divided into an electrochemical aluminum hot stamping foil and an electrochemical aluminum composite foil, wherein the electrochemical aluminum hot stamping foil generally comprises a base film layer, a release layer, a color layer, an aluminum plating layer, a glue layer and other multi-layer structures which are sequentially arranged, the preparation process generally comprises the steps of coating release layer paint and color layer paint on the base film layer, coating glue after vacuum aluminum plating, and finally rewinding a finished product, and the electrochemical aluminum composite foil does not contain the release layer. The base film layer is used as a carrier of an electrochemical aluminum foil structure, films such as PET (polyethylene terephthalate), BOPP (biaxially-oriented polypropylene) and the like are usually adopted, the base film layer can be torn off after a hot stamping process and can be reserved in a compounding process, the release layer is arranged to enable the color layer, the aluminized layer and the like to be smoothly separated from the base film during hot stamping, the color layer and the aluminized layer are used for providing color and pattern effects required by the electrochemical aluminum foil, the aluminized layer is used for providing a main metal luster effect, and the adhesive layer mainly has a transfer or compounding function. However, the color layer and the aluminized layer of the electrochemical plating aluminum foil are easily scratched, worn or oxidized in production and subsequent treatment, the use effect is affected, and a protective coating is often required to be arranged to improve the durability. The existing protective coating is difficult to combine abrasion resistance, scratch resistance, temperature resistance and weather resistance, and the service life of the product is influenced. Therefore, when the photo-cured protective coating is used for preparing the electrochemical aluminum hot stamping foil, the UV protective coating can be coated firstly after the release layer is coated, and then the color layer coating is coated, so that the color layer and the aluminum plating layer can be effectively protected after transfer, the durability and the use effect of the product are improved, and the photo-cured protective coating has important significance. In addition, the UV protective coating can also be applied to electrochemical aluminum composite foils and IMD decorative films. Disclosure of Invention The invention aims to solve the defects of the prior art and provide the wear-resistant UV bright light protective coating for the electrochemical aluminum foil and the preparation method thereof, and the coating has good wear resistance, scratch resistance, glossiness and weather resistance when in use, can be used as an electrochemical aluminum protective layer, and improves the durability and the use effect of the electrochemical aluminum foil; the preparation method of the film coating has stable process, convenient control and high production efficiency, and can meet the requirement of industrial production. The invention aims at realizing the technical scheme that the wear-resistant UV bright light protective coating for the electrochemical aluminum foil comprises, by weight, 40-50 parts of polyurethane acrylate resin, 15-25 parts of fluorine modified acrylic resin, 20-30 parts of reactive diluent, 5-15 parts of inorganic filler, 2-7 parts of photoinitiator, 2-5 parts of silane coupling agent, 1-3 parts of antioxidant and 1-3 parts of leveling agent. Further, the preparation method of the polyurethane acrylate resin comprises the following steps: A1, adding polyol into a reaction container under the protection of nitrogen, heating, dropwise adding polyisocyanate so that the molar ratio of-OH of the polyol to-NCO of the polyisocyanate is 1:1.7-2.1, adding a catalyst after the dropwise adding, and stopping reacting when the measured-NCO reaches 1.1-1.2 times of the theoretical residual value of initial feeding to obtain a mixture A; A2, cooling the mixture A, adding a polymerization inhibitor and a solvent, dropwise adding a hydroxyl-containing acrylate monomer to ensure that the molar ratio of