Photo-responsive UV pressure-sensitive adhesive and preparation method of same

A pressure-sensitive adhesive and light-responsive technology, applied in adhesives, film/sheet adhesives, non-polymer organic compound adhesives, etc., can solve the problem of low peel strength and achieve high peel strength and adhesive good performance

Inactive Publication Date: 2017-04-19
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the pressure-sensitive adhesive is used up or bonded incorrectly, it is desirable to have a low peel strength to make it easy to remove

Method used

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  • Photo-responsive UV pressure-sensitive adhesive and preparation method of same
  • Photo-responsive UV pressure-sensitive adhesive and preparation method of same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The composition of the glue includes an acrylic ester copolymer (the mass ratio of acrylic acid: octadecyl acrylate: butyl acrylate: isooctyl acrylate = 2:5:45:48 in the preparation method is 20 parts of the above four acrylic monomers added Add an initiator to 80 parts (parts by mass) of ethyl acetate solvent, the initiator is azobisisobutyronitrile, the amount of the initiator is 0.5‰ of the mass of the acrylate monomer, and the temperature is raised to 65°C for 2 hours. Raised to 75°C for 4 hours to complete the reaction of the double bond, and the solvent was removed by distillation); the photoresponsive monomer grafted the coumarin of the double bond of acrylic acid (the preparation method of the monomer was 0.05mol of 7-hydroxy -4-Methylumbelliferone and 0.05mol of ethylene carbonate were dissolved in 40ml of N,N-dimethylformamide, and 0.1mol of sodium carbonate was added, heated to 100°C and stirred for 10 hours, and the monomer was precipitated in water Afterwar...

Embodiment 2

[0026]The composition of glue comprises acrylate copolymer (preparation method is the same as embodiment 1, wherein the mass ratio of acrylate is propylene hydroxyethyl ester: dodecyl acrylate: butyl acrylate: isooctyl acrylate=2:5:45:48 , the amount of initiator acrylic acid is 0.8‰ of the ester monomer, the temperature rises to 70 ° C for 2 hours, and then the temperature rises to 90 ° C for 4 hours to completely react the double bond. The molecular weight is 300,000); Coumarin (preparation method is the same as in Example 1) according to the photoresponsive monomer in the mixture accounts for 8.4%, tetrahydrofuryl acrylate accounts for 21%, and photoinitiator 2,4,6-trimethylbenzoyl ethyl phosphate accounts for 0.6% %, and the rest is 70% of the acrylic copolymer prepared above. Mix the mixture evenly, disperse evenly and coat with a thickness of 60μm, irradiate with ultraviolet light of 390nm2 . In the second step, the light intensity of 300nm2 , light time 20min. The thi...

Embodiment 3

[0028] The composition of glue comprises acrylate copolymer (preparation method is the same as embodiment 1, wherein the mass ratio of acrylate is propylene hydroxyethyl ester: dodecyl acrylate: butyl acrylate: isooctyl acrylate=2:5:40:53 , the amount of initiator acrylic acid is ester monomer amount 1‰, molecular weight 200,000), the cinnamate of photoresponsive monomer grafting acrylic acid double bond (the hydroxyethyl acrylate of 0.02mol is dissolved in the ethyl acetate of 20ml Add 0.04 mol of triethylamine as an acid-binding agent, control the temperature at 0-5°C, add 0.04 mol of cinnamoyl chloride dropwise for 0.5 hours, then raise the temperature to room temperature and react for 7 hours, wash with water until neutral, and remove by rotary evaporation Solvent, can get photoresponsive monomer.) According to photoresponsive monomer accounts for 21% in the mixture, 2-phenoxyethyl acrylate accounts for 27.6%, photoinitiator 2-isopropylthioxanthone accounted for 1.4%, and ...

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Abstract

A photo-responsive UV pressure-sensitive adhesive and a preparation method of same. The pressure-sensitive adhesive is composed of four parts including 30-70% of an acrylate-type copolymer, 3-21% of a photo-responsive monomer, 21-63% of a photo-polymerization monomer, and 0.6-1.4% of a photoinitiator. The pressure-sensitive adhesive is prepared through the steps of: dissolving the polymer in the photo-polymerization monomer, adding the photo-responsive monomer and the photoinitiator and uniformly mixing the components; and irradiating the mixture by means of ultraviolet light of which the wavelength [lambda] is more than 390 nm and is less than 450 nm to cure the mixture to prepare the pressure-sensitive adhesive, and meanwhile, performing mask exposure to form patterns. The pressure-sensitive adhesive is reduced in stripping strength after being irradiated by means of ultraviolet light of which the wavelength [lambda] is more than 300 nm and is less than 360 nm, so that the pressure-sensitive adhesive is easy to strip. The stripping strength is recovered after the pressure-sensitive adhesive is irradiated by means of ultraviolet light of which the wavelength [lambda] is more than 200 nm and is less than 270 nm. The pressure-sensitive adhesive, when being used, has high stripping strength and good adhesion performance. When the pressure-sensitive adhesive is used or is mis-adhered, stripping strength of the pressure-sensitive adhesive can be reduced just by irradiating the pressure-sensitive adhesive by light, so that the pressure-sensitive adhesive is easy to strip. The stripping strength is recovered when the stripped pressure-sensitive adhesive is irradiated by light, and the pressure-sensitive adhesive can be used continuously. The pressure-sensitive adhesive is energy-saving, environment-protective and can be used repeatedly.

Description

technical field [0001] The invention belongs to the field of UV pressure-sensitive adhesives, and in particular relates to a light-responsive UV pressure-sensitive adhesive and a preparation method thereof. Background technique [0002] UV curing means that the photosensitizer in the system forms active fragments under the irradiation of ultraviolet light of appropriate wavelength and intensity, and then these active fragments trigger unsaturated monomers to polymerize, crosslink, etc. to achieve the purpose of curing. UV curing has the advantages of fast curing speed, less pollution, energy saving, and excellent performance of cured products. It is an environmentally friendly green curing technology. UV-curable adhesives are one of the development directions of adhesives in the future. They have the characteristics of "5E", namely Efficient (high efficiency), Enabling (wide adaptability), Economical (economical), Energy Saving (energy saving), Environmentally Friendly (envi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J4/06C09J4/02C09J7/02
CPCC09J4/06C09J7/385
Inventor 何勇陈强聂俊
Owner BEIJING UNIV OF CHEM TECH
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