CN-121991628-A - UV adhesive composition, decorative film and preparation method thereof

Abstract

The application discloses a UV adhesive composition, a decorative film and a preparation method thereof, and belongs to the field of UV adhesives. The UV adhesive composition comprises, by weight, 30-50 parts of polyurethane acrylate prepolymer, 40-60 parts of functional monomers, 2-5 parts of photoinitiators and 5-8 parts of coupling agents, wherein the functional monomers comprise at least three compounds of isobornyl acrylate, tetrahydrofuranyl acrylate, 2-hydroxybutyl acrylate, 4-hydroxybutyl acrylate and hydroxyethyl acrylate. According to the application, the UV adhesive composition and the component amounts are optimized, so that the high-strength bonding of PET, PP, PVC and other decorative film materials can be realized without pre-coating treatment, and the UV adhesive has excellent wet heat resistance and wide application prospect.

Inventors

• LIU FANG
• ZHANG YAN
• YANG HUI
• ZHANG XIAO
• HU DONGDONG
• HU YAZHAO
• LU SHUPING
• ZHOU XUMIAO

Assignees

• 乐凯胶片股份有限公司

Dates

Publication Date

20260508

Application Date

20260212

Claims (10)

1. 1. The UV adhesive composition is characterized by comprising the following components in parts by weight: 30-50 parts of polyurethane acrylate prepolymer, 40-60 parts of functional monomer, 2-5 parts of photoinitiator and 5-8 parts of coupling agent; The functional monomer comprises at least three compounds of isobornyl acrylate, tetrahydrofuran acrylate, 2-hydroxybutyl acrylate, 4-hydroxybutyl acrylate and hydroxyethyl acrylate.
2. 2. The UV gel composition according to claim 1, wherein the polyurethane acrylate prepolymer has a number average molecular weight Mn of 10000g/mol to 40000g/mol.
3. 3. The UV gel composition of claim 1, wherein the polyurethane acrylate prepolymer has a glass transition temperature Tg of-20 ℃ to-50 ℃.
4. 4. The UV glue composition of claim 1, wherein the photoinitiator comprises a cleavage type photoinitiator comprising at least one of 2,4, 6-trimethylbenzoyl-diphenyl phosphine oxide, ethyl 2,4, 6-trimethylbenzoyl-phenylphosphonate.
5. 5. The UV gel composition of claim 1, wherein the coupling agent comprises an isocyanate group-containing silane coupling agent.
6. 6. A decorative film comprising the UV gel composition of any one of claims 1-5.
7. 7. The decorative film of claim 6, comprising a first film layer, a film layer, and a second film layer laminated in that order; The adhesive film layer comprises the UV adhesive composition according to any one of claims 1 to 5.
8. 8. The decorative film of claim 7 wherein said first film layer comprises polyethylene terephthalate and said second film layer comprises at least one of polypropylene and polyvinyl chloride; And/or, the surface tension of the first film layer is >42dyn/cm; And/or the glue coating amount of the UV glue composition is 3g/m 2 -10g/m 2 .
9. 9. A method for producing the decorative film according to any one of claims 6 to 8, comprising the steps of: stirring and mixing all components in the UV adhesive composition to obtain an adhesive; Coating the adhesive on the surface of the first film layer after corona treatment to obtain a film layer; and attaching the second film layer to the adhesive film layer, and then carrying out light curing treatment to obtain the decorative film.
10. 10. The method for producing a decorative film according to claim 9, wherein the working condition parameters of the photo-curing treatment include a photo-irradiation dose of 200mJ/cm 2 or more.

Description

UV adhesive composition, decorative film and preparation method thereof Technical Field The application belongs to the field of UV glue, and particularly relates to a UV glue composition, a decorative film and a preparation method thereof. Background The UV curing adhesive (UV adhesive for short) is an adhesive which takes ultraviolet light as an energy source, irradiates a photoinitiator to generate active species such as free radicals or cations, and the like, so as to initiate an oligomer or monomer to rapidly undergo polymerization and crosslinking reaction to realize curing. As one of the most common radiation curing adhesives, the UV adhesive has various advantages, such as no solvent, no pollution basically, energy conservation, environmental protection, high curing speed, contribution to automatic production on a high-speed production line, high positioning speed, high production efficiency, realization of room-temperature or low-temperature curing, small volume of curing equipment, high bonding strength, suitability for various base materials and the like, and is widely applied to the fields of precision industries such as electronic appliances, optical components, biomedicine and the like. The decorative film is widely applied in industries such as building, automobiles, furniture and the like, and is generally composed of a multi-layer film structure, and the interlayer bonding quality of the decorative film has great influence on the performance and the service life of a product. The good interlayer adhesion can ensure the interlayer fastness of the decorative film and play the functions of decoration, protection and the like. The base film of the furniture decorative film is usually printed and printed with a pattern layer on the surface of PVC, PP or triamine paper, and then bonded and attached with a mask, so that the pattern layer has good color retention, scratch resistance and solvent resistance, the existing bonding technology has the characteristics of ①, namely, solvent type double-component polyurethane adhesive, high bonding strength and good durability, however, the reactive polyurethane adhesive needs long time for curing to reach enough crosslinking density, the supply period of the decorative film industry can be influenced, ② water-based adhesive is characterized by high drying speed and high production efficiency, is sensitive to environmental temperature and humidity, influences the bonding effect under the condition of high humidity, ③ hot-melt EVA back adhesive can be directly bonded, but the hot bonding temperature is up to 140 ℃ or higher, the energy consumption is high, the required adhesive layer thickness of the required bonding strength is more than 50 mu m, the material cost is high, the competition is not realized, and the existing UV adhesive in the market usually needs to treat film materials such as PET and PP, and the like, so that the effective pre-coating bonding can be realized. The precoating treatment cost of the film material is high and the process is complex. Therefore, there is a need to develop UV gels that can be applied to non-precoated film materials. Disclosure of Invention The present application aims to solve at least one of the technical problems in the related art to some extent. Therefore, the application aims to provide a UV adhesive composition, a decorative film and a preparation method thereof. According to the application, the UV adhesive composition and the component amounts are optimized, so that the high-strength bonding of PET, PP, PVC and other decorative film materials can be realized without pre-coating treatment, and the UV adhesive has excellent wet heat resistance and wide application prospect. The first aspect of the present application proposes a UV glue composition. According to the embodiment of the application, the UV adhesive composition comprises the following components in parts by weight: 30-50 parts of polyurethane acrylate prepolymer, 40-60 parts of functional monomer, 2-5 parts of photoinitiator and 5-8 parts of coupling agent; The functional monomer comprises at least three compounds of isobornyl acrylate, tetrahydrofuran acrylate, 2-hydroxybutyl acrylate, 4-hydroxybutyl acrylate and hydroxyethyl acrylate. According to the UV adhesive composition provided by the embodiment of the application, the UV adhesive composition and the use amount of each component are optimized, so that the high-strength adhesion of decorative film materials such as PET, PP, PVC can be realized without pre-coating treatment, and the UV adhesive composition has excellent moisture and heat resistance and wide application prospect. In addition, the UV gel composition according to the above embodiment of the present application may have the following additional technical features: In some embodiments of the application, the polyurethane acrylate prepolymer has a number average molecular weight Mn of 10000g/mol to 40000g/mol. In some embodiments o