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CN-121991600-A - UV tackifying structural adhesive tape and preparation method and application thereof

CN121991600ACN 121991600 ACN121991600 ACN 121991600ACN-121991600-A

Abstract

The invention discloses a UV tackifying structural adhesive tape, and a preparation method and application thereof. The adhesive tape comprises a substrate layer and a UV tackifying structural adhesive layer arranged on at least one surface of the substrate layer, wherein the adhesive layer is prepared from 70-80 parts of polyurethane oligomer, 10-20 parts of acryloxycarboxylic acid derivative, 3-5 parts of acryloxyethyl phosphate and/or acryloxyethyl phosphate derivative, 1-2 parts of bifunctional acrylic monomer, 0.5-0.8 part of hydroxypropyl acrylate and 0.8-1.2 parts of photoinitiator, and the photoinitiator is compounded by at least two photoinitiators with different absorption wavelengths. The preparation method comprises the steps of synthesizing polyurethane oligomer, preparing glue according to the mass parts, diluting, coating on a substrate, drying, compounding a release film and preserving. The adhesive tape has excellent positioning-locking cooperativity, simple preparation process and stable storage.

Inventors

  • WU MINGJIANG

Assignees

  • 萍乡高恒材料科技有限公司

Dates

Publication Date
20260508
Application Date
20260130

Claims (10)

  1. 1. The UV tackifying structural adhesive tape comprises a substrate layer and a UV tackifying structural adhesive layer arranged on at least one surface of the substrate layer, and is characterized in that the UV tackifying structural adhesive layer is prepared from the following raw materials in parts by mass: 70-80 parts of polyurethane oligomer which is aromatic polyester polyurethane containing unsaturated end groups, 10 To 20 parts of acryloyloxy carboxylic acid derivative, 3-5 Parts of acryloyloxyethyl phosphate and/or acryloyloxyethyl phosphate derivative, 1 To 2 parts of difunctional acrylic monomer, 0.5 To 0.8 parts of hydroxypropyl acrylate, 0.8-1.2 Parts of photoinitiator, wherein the photoinitiator is compounded by at least two photoinitiators with different absorption wavelengths so as to realize curing of different glue layer thicknesses.
  2. 2. The UV-tackifying structural adhesive tape according to claim 1, wherein the molecular weight of the polyurethane oligomer is 5000-8500, the aromatic polyester in the polyurethane oligomer is obtained by alkyd polymerization, the alcohol is at least one of neopentyl glycol, methyl propylene glycol and methyl pentanediol, and the acid is terephthalic acid and/or isophthalic acid.
  3. 3. The UV curable structural adhesive tape of claim 2, wherein the aromatic polyester is a poly (neopentyl glycol terephthalate) glycol obtained by reacting terephthalic acid with neopentyl glycol.
  4. 4. The UV-curable adhesive tape according to claim 3, wherein the polyurethane oligomer is prepared by reacting a poly (neopentyl glycol terephthalate) diol, a diisocyanate and a hydroxyethyl methacrylate in a molar ratio of 4-6:5-7:2.
  5. 5. The UV curable structural adhesive tape of claim 4, wherein the reaction comprises the steps of: Firstly, carrying out vacuum dehydration on the neopentyl glycol terephthalate glycol at 110-120 ℃ for 1.5-2 h, cooling to below 80 ℃, adding diisocyanate, heating to 80-82 ℃ for 3-3.5 h, cooling to 70-72 ℃, adding hydroxyethyl methacrylate, and reacting for 4.5-5 h to obtain the polyurethane oligomer.
  6. 6. The UV curable structural adhesive tape according to claim 4, wherein the diisocyanate is selected from one or more of isophorone diisocyanate, hexamethylene diisocyanate, 4' -dicyclohexylmethane diisocyanate, diphenylmethane diisocyanate-50.
  7. 7. The UV tackifying structural adhesive tape according to claim 1, wherein the photoinitiator is formed by compounding bis (2, 4, 6-trimethylbenzoyl) -phenylphosphine oxide and 1-hydroxycyclohexyl-phenyl ketone, and the mass ratio of the bis (2, 4, 6-trimethylbenzoyl) -phenylphosphine oxide to the 1-hydroxycyclohexyl-phenyl ketone is 2:0.8-1.2; the acryloxycarboxylic acid derivative is one or more of beta-acryloxypropionic acid, acryloxybutyric acid, methacryloxypropionic acid and methacryloxybutyric acid; acryloyloxy Ethyldi acryloyloxyethyl di-methyl phosphate ester one or more of methacryloyloxyethyl dimethyl phosphate, acryloyloxyethyl phenyl phosphate, and methacryloyloxyethyl phenyl phosphate; the difunctional acrylic monomer is one or more of ethylene glycol diacrylate, ethylene glycol dimethacrylate, 1, 4-butanediol diacrylate, 1, 4-butanediol dimethacrylate, cyclohexanedimethanol diacrylate and cyclohexanedimethanol dimethacrylate.
  8. 8. A method for preparing the UV tackifying structural adhesive tape according to any one of claims 1 to 7, comprising the steps of: (1) Mixing the raw materials in the UV tackifying structural adhesive tape according to the mass parts under the light-shielding condition, and diluting the raw materials with an organic solvent until the solid content is 30% -50% to obtain the UV tackifying structural adhesive tape; (2) Diluting the UV tackifying structural glue to coating viscosity by using an organic solvent, and coating the UV tackifying structural glue on a corona surface of a substrate layer under a light-shielding condition; (3) And (5) drying in sections to remove the organic solvent, covering a release film on the dried adhesive layer, and preserving the adhesive layer in a dark place to obtain the UV tackifying structural adhesive tape.
  9. 9. The UV tackifying structural adhesive tape according to claim 8, wherein the sectional drying temperature is 60-120 ℃, the sectional drying time is 3-5 min, the organic solvent is one or more of toluene, ethyl acetate and butanone, the coating viscosity is 300 mPa-500 mPa-s, and the dry adhesive thickness of the UV tackifying structural adhesive layer is 30-80 μm.
  10. 10. The use of a UV-curable structural adhesive tape according to any one of claims 1 to 7 or a UV-curable structural adhesive tape prepared by the preparation method according to claim 8 or 9 for the adhesive fixation of metal substrates or polyimide substrates.

Description

UV tackifying structural adhesive tape and preparation method and application thereof Technical Field The invention belongs to the technical field of adhesive products, and particularly relates to a UV (ultraviolet) tackifying structural adhesive tape and a preparation method and application thereof. Background In the high-end manufacturing fields of electronic equipment, new energy automobiles, aerospace and the like, metal (such as an aluminum plate) or high-performance polymer materials (such as polyimide PI films) are often subjected to temporary lamination and positioning, and then permanent structure fixing is carried out. In the prior art, the UV curing adhesive or the adhesive film has the defects of high strength, temperature resistance, yellowing resistance, reworkability and the like after curing, but the adhesive positioning and the reworking locking are often needed in the assembly process, and the dilemma is that if the initial adhesion before UV irradiation is too high, the position is difficult to adjust during the lamination, reworking cannot be performed after misplacement, and if the initial adhesion before UV irradiation is too low, the positioning stability is insufficient and the offset is easy to occur in the transportation or the subsequent procedures. Therefore, there is a need to develop a novel adhesive tape that has moderate initial adhesion before UV irradiation to achieve precise adhesion and reworkability, and can rapidly form ultra-high adhesion and structural strength after UV irradiation, and is particularly suitable for reliable assembly of difficult-to-adhere substrates such as aluminum plates, polyimide, and the like. Disclosure of Invention Aiming at the defects of the prior art, the invention provides a UV tackifying structural adhesive tape with excellent initial reworking positioning function and later structural strength, and a preparation method and application thereof. In order to solve the technical problems, the invention adopts the following technical scheme: The UV tackifying structural adhesive tape comprises a substrate layer and a UV tackifying structural adhesive layer arranged on at least one surface of the substrate layer, wherein the UV tackifying structural adhesive layer is prepared from the following raw materials in parts by mass: 70-80 parts of polyurethane oligomer which is aromatic polyester polyurethane containing unsaturated end groups, 10 To 20 parts of acryloyloxy carboxylic acid derivative, 3-5 Parts of acryloyloxyethyl phosphate and/or acryloyloxyethyl phosphate derivative, 1 To 2 parts of difunctional acrylic monomer, 0.5 To 0.8 parts of hydroxypropyl acrylate, 0.8-1.2 Parts of photoinitiator, wherein the photoinitiator is compounded by at least two photoinitiators with different absorption wavelengths so as to realize curing of different glue layer thicknesses. In the UV tackifying structural adhesive tape, preferably, the aromatic polyester in the polyurethane oligomer is polymerized by alkyd, the alcohol is at least one of neopentyl glycol, methyl propylene glycol and methyl pentanediol, and the acid is terephthalic acid and/or isophthalic acid. In the above UV tackifying structural adhesive tape, preferably, the aromatic polyester is a poly (neopentyl glycol terephthalate) glycol obtained by reacting terephthalic acid with neopentyl glycol. In the UV tackifying structural adhesive tape, preferably, the polyurethane oligomer is prepared by reacting poly (neopentyl glycol terephthalate) glycol, diisocyanate and hydroxyethyl methacrylate according to a molar ratio of 4-6:5-7:2. Preferably, the reaction of the UV tackifying structural adhesive tape comprises the following steps: Firstly, carrying out vacuum dehydration on the neopentyl glycol terephthalate glycol at 110-120 ℃ for 1.5-2 h, cooling to below 80 ℃, adding diisocyanate, heating to 80-82 ℃ for 3-3.5 h, cooling to 70-72 ℃, adding hydroxyethyl methacrylate, and reacting for 4.5-5 h to obtain the polyurethane oligomer. The UV tackifying structural adhesive tape is preferably one or more of isophorone diisocyanate (IPDI), hexamethylene Diisocyanate (HDI), 4' -dicyclohexylmethane diisocyanate (H 12 MDI) and diphenylmethane diisocyanate-50 (MDI-50). In the UV tackifying structural adhesive tape, preferably, the photoinitiator is formed by compounding bis (2, 4, 6-trimethylbenzoyl) -phenylphosphine oxide (819) and 1-hydroxycyclohexyl-phenyl ketone (184), and the mass ratio of the bis (2, 4, 6-trimethylbenzoyl) -phenylphosphine oxide to the 1-hydroxycyclohexyl-phenyl ketone is 2:0.8-1.2. The above-described UV tackifying structural adhesive tape, preferably, the acryloxycarboxylic acid derivative is one or more of beta-acryloxypropionic acid, acryloxybutyric acid, methacryloxypropionic acid and methacryloxybutyric acid. The above-described UV tackifying structural adhesive tape, preferably, the acryloyloxyethyl phosphate derivative is methacryloyloxyethyl phosphate acryloyloxyethyl dime