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CN-121991631-A - High-toughness ultraviolet light curing temporary protection adhesive and preparation method and use method thereof

CN121991631ACN 121991631 ACN121991631 ACN 121991631ACN-121991631-A

Abstract

The invention discloses a high-toughness ultraviolet light curing temporary protection adhesive, and a preparation method and a use method thereof, wherein the adhesive is prepared from the following raw materials in parts by weight: 60-75 parts of polyurethane acrylic ester, 20-40 parts of reactive diluent, 1-5 parts of photoinitiator, 0.1-1 part of flatting agent, 0.1-1 part of defoamer, 0.5-5 parts of filler, 0.5-5 parts of nano toughening agent and 0.1-5 parts of silane coupling agent; according to the high-toughness ultraviolet light curing temporary protection adhesive, the polyfunctional polyurethane acrylic ester with excellent flexibility and strength is synthesized to serve as a main resin, and a specific type of nanometer toughening agent is compounded, so that the final cured adhesive layer has high toughness and impact resistance, and meanwhile, good surface drying performance, excellent laminating performance and peelability are realized.

Inventors

  • CHENG JIANGUANG
  • SHI XIANGQIAN
  • HE CHANGSHENG
  • WANG ZIPING
  • CHEN DENGYU
  • HUANG JIE
  • FENG ZHENG

Assignees

  • 南通高盟新材料有限公司

Dates

Publication Date
20260508
Application Date
20260326

Claims (10)

  1. 1. The high-toughness ultraviolet light curing temporary protection adhesive is characterized by comprising the following raw materials in parts by weight: 60-75 parts of polyurethane acrylic ester, 20-40 Parts of a reactive diluent, 1-5 Parts of a photoinitiator, 0.1-1 Part of leveling agent, 0.1-1 Part of defoaming agent, 0.5 To 5 portions of nanometer toughening agent, 0.1-5 Parts of silane coupling agent.
  2. 2. The high-toughness ultraviolet light curing temporary protection adhesive according to claim 1, wherein the polyurethane acrylate is polyurethane acrylate with functionality of 2-4 and molecular weight of 10000-50000, and the polyurethane acrylate is a product of reaction of isocyanate-terminated polyurethane prepolymer and acrylate monomer.
  3. 3. The high-toughness ultraviolet light curing temporary protection adhesive according to claim 2, wherein the isocyanate-terminated polyurethane prepolymer is prepared by reacting isocyanate and dihydric alcohol in a molar ratio of isocyanate group to hydroxyl group of (1.0-1.5): 1.
  4. 4. The high-toughness ultraviolet light curing temporary protective adhesive according to claim 3, wherein, The isocyanate is one or a mixture of more of hexamethylene diisocyanate, isophorone diisocyanate, dicyclohexylmethane diisocyanate, xylylene diisocyanate, toluene diisocyanate and diphenyl methyl diisocyanate; the dihydric alcohol is one or more of polyether dihydric alcohol, polyester dihydric alcohol and polycarbonate dihydric alcohol.
  5. 5. The high-toughness ultraviolet light curing temporary protective adhesive according to claim 4, wherein, The isocyanate is isophorone diisocyanate; the polyether glycol comprises one or more of polyoxyethylene glycol with average molecular weight of 2000-4000, polypropylene glycol with average molecular weight of 2000-6000 or polytetrahydrofuran with average molecular weight of 2000-4000; The polyester diol comprises aromatic polyester polyol and aliphatic polyester polyol with average molecular weight of 1000-5000; The polycarbonate diol includes, but is not limited to, a polycarbonate diol having an average molecular weight of 2000 to 4000.
  6. 6. The high-toughness ultraviolet light curing temporary protection adhesive according to claim 2, wherein the acrylate monomer is a compound of a hydroxyl-containing acrylate monomer and a hydroxyl-free acrylate.
  7. 7. The high-toughness ultraviolet light curing temporary protective adhesive according to claim 6, wherein, The hydroxyl-containing acrylate monomer is pentaerythritol triacrylate; the hydroxyl-free acrylate monomer is one or more of trimethylolpropane triacrylate, dipentaerythritol hexaacrylate and ethoxylated trimethylolpropane triacrylate.
  8. 8. The high-toughness ultraviolet light curing temporary protective adhesive according to claim 1, wherein the photoinitiator is a free radical photoinitiator; The reactive diluents include butylene mono (meth) acrylate, cyclohexyl (meth) acrylate, dicyclopentanyl (meth) acrylate, dicyclopentenyl (meth) acrylate, dicyclopentenyloxyethyl (meth) acrylate, N-diethylaminoethyl (meth) acrylate, 2-ethoxyethyl (meth) acrylate, 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, caprolactone-modified 2-hydroxyethyl (meth) acrylate, isobornyl (meth) acrylate, lauryl (meth) acrylate, acryloylmorpholine, N-vinylcaprolactam, nonylphenoxy polyethylene glycol (meth) acrylate, nonylphenoxy polypropylene glycol (meth) acrylate, phenoxyethyl (meth) acrylate, phenoxyhydroxypropyl (meth) acrylate, phenoxydiglycol diglycol (meth) acrylate, polyethylene glycol (meth) acrylate, polypropylene glycol (meth) acrylate, tetrahydrofurfuryl (meth) acrylate, 1, 6-hexanediol diacrylate, trimethylolpropane methacrylate, trimethylolpropane triacrylate, trimethylolpropane trimethacrylate, pentaerythritol or trimethylolpropane triacrylate; The nanometer toughening agent is one or more of nanometer silicon dioxide and/or nanometer aluminum oxide, nanometer rubber particles and core-shell acrylate microspheres, the surfaces of which are modified by organosilane or acrylate monomers.
  9. 9. The method for preparing the high-toughness ultraviolet light curing temporary protection adhesive according to any one of claims 1 to 8, comprising the following steps: S1, synthesizing an isocyanate-terminated polyurethane prepolymer, namely heating one or more of polyether glycol, polyester glycol and polycarbonate glycol to 100-120 ℃, stirring under vacuum condition, dewatering for 2-3 hours, removing trace moisture, cooling the dewatered glycol or glycol mixture to 50-80 ℃, adding auxiliary polyphosphoric acid, stirring for 10-30 minutes, adding metered isocyanate and catalyst, stirring under vacuum condition, reacting, and monitoring that the NCO group content reaches a theoretical value of 0.7-1.7%, thus obtaining the isocyanate-terminated polyurethane prepolymer; S2, polyurethane acrylic ester synthesis, namely adding a compound containing hydroxyl acrylic ester monomers and a compound containing no hydroxyl acrylic ester monomers into the isocyanate-terminated polyurethane prepolymer prepared in the step S1, and reacting the hydroxyl groups of the hydroxyl acrylic ester monomers with NCO groups at the tail ends of the prepolymer under the conditions of 70-80 ℃ and vacuum degree lower than 100Pa to obtain the required polyurethane acrylic ester; And S3, preparing a UV adhesive, namely sequentially adding the synthesized polyurethane acrylic ester, the reactive diluent, the photoinitiator, the silane coupling agent, the nano toughening agent, the defoaming agent and the leveling agent under the light-shielding condition, and fully stirring until all components are uniformly dispersed to obtain the high-toughness ultraviolet light curing temporary protection adhesive.
  10. 10. The method for using the high-toughness ultraviolet light curing temporary protection adhesive according to any one of claims 1 to 8, comprising the following steps: (I) Pretreating the surface of a target substrate to thoroughly remove grease, fingerprints, dust and release agent pollutants; (II) injecting the prepared adhesive into spraying equipment, and uniformly spraying the adhesive on the surface of the target substrate after cleaning; (III) standing and leveling after spraying, and after the surface of the adhesive layer is leveled, adopting a UV-LED light source with the wavelength of 365 nm or 395 nm to carry out irradiation curing, wherein the irradiation energy is controlled in the interval of 500-2000 mJ/cm <2 >; and (IV) after curing is finished, transferring the base material with the protective adhesive layer into a subsequent transferring or processing operation flow.

Description

High-toughness ultraviolet light curing temporary protection adhesive and preparation method and use method thereof Technical Field The invention relates to the technical field of adhesives, in particular to a high-toughness ultraviolet light curing temporary protection adhesive and a preparation method and a use method thereof. Background In the production, transportation and assembly processes of precision parts such as electronic products (such as mobile phones and tablet personal computers), high-grade decorating parts, optical lenses and the like, the surfaces (such as glass, polished metal and coating layers) of the precision parts are extremely easy to scratch, pollute or chemically erode. Therefore, it is generally necessary to apply a temporary protective film or apply a temporary protective coating at the beginning of the process. Ultraviolet (UV) curing adhesives are widely used for such temporary protective materials because of their fast curing speed, high efficiency, environmental protection, and the like. However, the existing UV-curable temporary protective adhesives generally have the following problems: 1) The toughness is insufficient, in order to pursue the peelability, the adhesive layer is often designed to be brittle or not high in cohesive strength, so that the adhesive layer is easy to crack or separate from the base material when being subjected to bending, impact or local stress, and the protective effect is lost; 2) The balance of resistance is difficult, high toughness often means high adhesion, which can lead to difficult peeling or residual glue generation after the end of the protection period, while pursuing easy peeling can sacrifice the close fitting and impact protection capability to the substrate; 3) The applicability is limited in that the existing protective adhesive has insufficient flexibility and durability for curved surfaces, special-shaped parts or parts needing subsequent deep processing. Therefore, the UV curing temporary protection adhesive with high toughness, excellent surface drying effect, good laminating property and later clean strippability is developed, and has important industrial application value. Disclosure of Invention In order to overcome the defects in the prior art, the invention aims to provide a high-toughness ultraviolet light curing temporary protection adhesive, and a preparation method and a use method thereof. The adhesive achieves an ideal balance of toughness, protection and peelability. The invention is realized by the following technical scheme: In a first aspect, the invention provides a high-toughness ultraviolet light curing temporary protection adhesive, which comprises the following raw materials in parts by weight: 60-75 parts of polyurethane acrylic ester, 20-40 Parts of a reactive diluent, 1-5 Parts of a photoinitiator, 0.1-1 Part of leveling agent, 0.1-1 Part of defoaming agent, 0.5 To 5 portions of nanometer toughening agent, 0.1-5 Parts of silane coupling agent. The polyurethane acrylic ester is polyurethane acrylic ester with the functionality of 2-4 and the molecular weight of 10000-50000, and the component is taken as a main resin to provide the basic strength, the flexibility and the impact resistance of the cured film. Further, the polyurethane acrylate is the product of reacting an isocyanate-terminated polyurethane prepolymer with an acrylate monomer; further, the isocyanate-terminated polyurethane prepolymer is prepared by reacting isocyanate and dihydric alcohol according to the molar ratio of isocyanate group to hydroxyl group of (1.0-1.5): 1; Further, the isocyanate is one or a mixture of more of hexamethylene diisocyanate, isophorone diisocyanate, dicyclohexylmethane diisocyanate, xylylene diisocyanate, toluene diisocyanate and diphenyl methyl diisocyanate; further, the isocyanate is preferably isophorone diisocyanate; Further, the dihydric alcohol is one or more of polyether dihydric alcohol, polyester dihydric alcohol and polycarbonate dihydric alcohol; Further, the polyether glycol includes, but is not limited to, one or more of polyethylene oxide glycol having an average molecular weight of 2000-4000, polypropylene glycol having an average molecular weight of 2000-6000, or polytetrahydrofuran having an average molecular weight of 2000-4000; further, the polypropylene glycol is preferably polypropylene glycol having an average molecular weight of 3000 to 4000; Further, the polyester diol includes an aromatic polyester polyol and an aliphatic polyester polyol having an average molecular weight of 1000-5000, including but not limited to one or more of Desmophen 1100、Desmophen 1652、Desmophen 1800、Desmophen 2000、Dynacoll 7000、Dynacoll 8000、Dynacoll 7300、Dynacoll 7200、WL-220A、HD-220, HDP-3050、 HY-3020; Further, the polyester diol is preferably Desmophen 1800; Further, the polycarbonate diol includes, but is not limited to, polycarbonate diol (PCDL) having an average molecular weight of 2000 to 4000; further, the