阅读说明：本技术 Uv湿气双固化的热熔胶膜及其制备方法和应用 (UV (ultraviolet) moisture dual-curing hot melt adhesive film and preparation method and application thereof ) 是由 熊唯诚 郑时恒 茹正伟 于 2019-08-28 设计创作，主要内容包括：本发明属于胶膜制备技术领域,具体涉及一种UV湿气双固化的热熔胶膜及其制备方法和应用。其中热熔胶膜以超支化含硅丙烯酸酯单体为主原料,结合树脂、光引发剂、硅烷偶联剂、催化剂、抗氧剂、光稳定剂等组分,制备出UV光照射和/或湿气均可固化的胶膜,以便于胶膜在没有UV光照射下可持续湿热固化,提高了触摸屏黑边部分的剥离强度,解决了触摸屏的封装难题。(the invention belongs to the technical field of adhesive film preparation, and particularly relates to a UV (ultraviolet) moisture dual-curing hot melt adhesive film and a preparation method and application thereof. The hot melt adhesive film is prepared by taking a hyperbranched silicon-containing acrylate monomer as a main raw material and combining components such as resin, a photoinitiator, a silane coupling agent, a catalyst, an antioxidant and a light stabilizer, so that the adhesive film which can be cured by UV light irradiation and/or moisture is conveniently cured by continuous moist heat without UV light irradiation, the peel strength of the black edge part of the touch screen is improved, and the packaging problem of the touch screen is solved.)

1. The UV moisture dual-curing hot melt adhesive film is characterized by comprising the following raw materials in parts by weight:

Resin: 80-95 parts;

photoinitiator (2): 1-4 parts;

Hyperbranched silicon-containing acrylate monomer: 2-5 parts;

Silane coupling agent: 0.5-1 part;

catalyst: 0.001-0.01 portion;

Antioxidant: 0.1-0.5 part; and

Light stabilizer: 0.1 to 0.5 portion.

2. The hot melt adhesive film according to claim 1,

The structural formula of the hyperbranched silicon-containing acrylate monomer is as follows:

Wherein

R₁Is CH₂-CH₂-Si(OMe)₃，R₂is H or CH₃。

3. The hot melt adhesive film according to claim 1,

the resin comprises at least one of EVA resin and POE resin; wherein

The content of VA in the EVA resin is 20-30%, and the melt index is 15-30g/10 min; and

The content of octene in the POE resin is 20-40%, and the melt index is 15-30g/10 min.

4. The hot melt adhesive film according to claim 1,

the photoinitiator comprises 2-hydroxy-2-methyl-1-phenyl acetone, 1-hydroxy-cyclohexyl phenyl ketone, 1' - (methylene di-4, 1-phenylene) bis [ 2-hydroxy-2-methyl-1-acetone, 2-benzyl-2-dimethylamino-1- (4-morpholine phenyl) butanone, 2-methyl-1- (4-methylthiophenyl) -2-morpholinyl-1-acetone, (2,4, 6-trimethylbenzoyl) diphenyl phosphine oxide, phenyl bis (2,4, 6-trimethylbenzoyl) phosphine oxide and one or more of 2, 2-dimethoxy-2-phenyl acetophenone.

5. The hot melt adhesive film according to claim 1,

The silane coupling agent comprises one or more of vinyl trimethoxy silane, vinyl triacetoxy silane and vinyl tri (beta-methoxyethoxy) silane.

6. The hot melt adhesive film according to claim 1,

The catalyst comprises one or more of cobalt naphthenate, cobalt stearate and stannous oxalate.

7. The hot melt adhesive film according to claim 1,

The antioxidant comprises one or more of 2- [4, 6-bis (2, 4-dimethylphenyl) -1,3, 5-triazine-2-yl ] -5- (octyloxy) phenol, pentaerythritol tetrakis (3, 5-di-tert-butyl-4-hydroxy) phenylpropionate and n-octadecyl 3- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate.

8. The hot melt adhesive film according to claim 1,

The light stabilizer comprises one or more of bis (1-octyloxy-2, 2,6, 6-tetramethyl-4-piperidyl) sebacate, bis (2,2,6, 6-tetramethyl-4-piperidyl) sebacate and polysuccinic acid (4-hydroxy-2, 2,6, 6-tetramethyl-1-piperidyl ethanol ester).

9. A preparation method of a hot melt adhesive film is characterized by comprising the following steps:

Preparing additive masterbatch;

Preparing a liquid auxiliary agent;

Adding resin and the additive master batch into a liquid auxiliary agent, and uniformly mixing by a mixer;

Extruding through a material extruder; and

Preparing the UV moisture dual-curing hot melt adhesive film through a casting die head.

10. The production method according to claim 9,

Mixing an antioxidant, a light stabilizer, a photoinitiator and resin, and extruding the mixture through a co-rotating meshed double-screw extruder to obtain additive masterbatch; wherein

The rotating speed of the twin-screw of the co-rotating meshed twin-screw extruder is 40r/min-60r/min, and the temperature of each section is 100 ℃, 120 ℃, 130 ℃, 140 ℃ and 140 ℃ in sequence.

11. the production method according to claim 9,

And adding a catalyst into the mixture of the hyperbranched silicon-containing acrylate monomer and the silane coupling agent, and uniformly dispersing to form the liquid auxiliary agent.

12. The production method according to claim 9,

The mixer is a vertical double-ribbon mixer, the driving power of the mixer is 3KW-120KW, the mixing temperature is 35-45 ℃, and the mixing time is 2-5 hours.

13. The production method according to claim 9,

the material extruder is a single-screw extruder, the diameter of a screw is 130mm, the rotating speed of the screw is 30-60r/min, and the temperatures of all sections are 75 ℃, 80 ℃, 84 ℃, 85 ℃ and 85 ℃ in sequence.

14. an application of a UV moisture dual-curing hot melt adhesive film in packaging a touch screen.

Technical Field

The invention belongs to the technical field of adhesive film preparation, and particularly relates to a UV (ultraviolet) moisture dual-curing hot melt adhesive film and a preparation method and application thereof.

Background

Touch screen market demand is getting bigger and bigger, need use the laminating of optical cement in its production process. The optical cement in the current market is divided into three types: one is OCA, namely a transparent substrate-free double-sided adhesive tape, has a long application history, but has the defects of high initial adhesion, extremely low fluidity, difficult bubble discharge in the processing process, and mainly attachment to a mobile phone or a screen below 10 inches; the second type is LOCA, namely liquid optical cement, which is liquid in the processing process and solid after curing, has better elasticity and light transmittance, and can be suitable for large size. The third type is a hot-melt optical adhesive film, which has been developed in recent years, is suitable for attaching screens of various sizes, and has a simple processing process and easy reverse disassembly. The hot-melt optical adhesive film can reduce the bonding threshold of the touch screen and the liquid crystal module thereof, improve the bonding yield and develop very rapidly in two years.

the traditional optical packaging is difficult to be suitable for automatic packaging of 60-90 inch oversized display screens, the defect rate is high, and reworking is complex; the black edge area of the corner of the oversized screen can overflow glue or delaminate after long-term use. Along with the development of hot melt optical adhesive film and full-automatic laminating production line, for LOCA and traditional OCA glue, packaging process is simpler can realize doing over again simultaneously and reduce the defective products and produce.

Along with the popularization of outdoor advertisements, education whiteboards and business all-in-one machines, the size of a packaged touch display screen is larger and larger, and the requirement of 60-100 inches is gradually developed. Because the touch screen size is very big, current UV hot melt adhesive can not provide effective protection at the touch screen that has the black border field, and the film is incomplete at the shade part solidification that shelters from, causes the touch screen frame or has the marginal colored printing ink place UV irradiation intensity weak, brings the peel strength in black border field inadequately, can produce the delaminating after long-term the use. Therefore, how to realize the reliable stability of the full-size range of the large-screen display screen so as to solve the problem that the black edge field cannot be completely cured is a big problem in the field of optical packaging.

Disclosure of Invention

The invention aims to provide a UV moisture dual-curing hot melt adhesive film and a preparation method and application thereof.

In order to solve the technical problems, the invention provides a UV moisture dual-curing hot melt adhesive film which comprises the following raw materials in parts by weight: resin: 80-95 parts; photoinitiator (2): 1-4 parts; hyperbranched silicon-containing acrylate monomer: 2-5 parts; silane coupling agent: 0.5-1 part; catalyst: 0.001-0.01 portion; antioxidant: 0.1-0.5 part; and light stabilizers: 0.1 to 0.5 portion.

Further, the structural formula of the hyperbranched silicon-containing acrylate monomer is as follows:

Wherein R is₁Is CH₂-CH₂-Si(OMe)₃，R₂Is H or CH₃。

Further, the resin comprises at least one of EVA resin and POE resin; wherein the content of VA in the EVA resin is 20-30%, and the melt index is 15-30g/10 min; and the content of octene in the POE resin is 20-40%, and the melt index is 15-30g/10 min.

Further, the photoinitiator includes 2-hydroxy-2-methyl-1-phenyl acetone, 1-hydroxy-cyclohexyl phenyl ketone, 1' - (methylenebis-4, 1-phenylene) bis [ 2-hydroxy-2-methyl-1-propanone, 2-benzyl-2-dimethylamino-1- (4-morpholinophenyl) butanone, 2-methyl-1- (4-methylthiophenyl) -2-morpholinyl-1-acetone, (2,4, 6-trimethylbenzoyl) diphenyl phosphine oxide, phenyl bis (2,4, 6-trimethylbenzoyl) phosphine oxide and one or more of 2, 2-dimethoxy-2-phenyl acetophenone.

Further, the silane coupling agent comprises one or more of vinyl trimethoxy silane, vinyl triacetoxy silane and vinyl tri (beta-methoxyethoxy) silane.

Further, the catalyst comprises one or more of cobalt naphthenate, cobalt stearate and stannous oxalate.

Further, the antioxidant comprises one or more of 2- [4, 6-bis (2, 4-dimethylphenyl) -1,3, 5-triazin-2-yl ] -5- (octyloxy) phenol, pentaerythritol tetrakis (3, 5-di-tert-butyl-4-hydroxy) phenylpropionate, and n-octadecyl 3- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate.

Further, the light stabilizer includes one or more of bis (1-octyloxy-2, 2,6, 6-tetramethyl-4-piperidyl) sebacate, bis (2,2,6, 6-tetramethyl-4-piperidyl) sebacate, and polysuccinic acid (4 hydroxy-2, 2,6, 6-tetramethyl-1-piperidylethanol ester).

In another aspect, the present invention further provides a method for preparing a UV moisture dual-curing hot melt adhesive film, including: preparing additive masterbatch; preparing a liquid auxiliary agent; adding resin and the additive master batch into a liquid auxiliary agent, and uniformly mixing by a mixer; extruding through a material extruder; and preparing the UV moisture dual-curing hot melt adhesive film through a casting die head.

Further, mixing an antioxidant, a light stabilizer, a photoinitiator and resin, and extruding the mixture through a co-rotating meshed double-screw extruder to obtain the additive masterbatch; wherein the twin-screw rotating speed of the co-rotating meshed twin-screw extruder is 40r/min-60r/min, and the temperature of each section is 100 ℃, 120 ℃, 130 ℃, 140 ℃ and 140 ℃ in sequence.

Further, adding a catalyst into the mixture of the hyperbranched silicon-containing acrylate monomer and the silane coupling agent, and uniformly dispersing to form the liquid auxiliary agent.

Further, the mixer is a vertical double-ribbon mixer, the driving power of the mixer is 3KW-120KW, the mixing temperature is 35-45 ℃, and the mixing time is 2-5 hours.

Further, the material extruder is a single screw extruder, the diameter of a screw is 130mm, the rotating speed of the screw is 30-60r/min, and the temperature of each section is 75 ℃, 80 ℃, 84 ℃, 85 ℃ and 85 ℃ in sequence.

on the other hand, the invention also provides application of the UV moisture dual-curing hot melt adhesive film in packaging the touch screen.

The UV moisture dual-curing hot melt adhesive film and the preparation method and application thereof have the advantages that the UV moisture dual-curing hot melt adhesive film is prepared by taking the hyperbranched silicon-containing acrylate monomer as a main raw material and combining the components such as resin, a photoinitiator, a silane coupling agent, a catalyst, an antioxidant, a light stabilizer and the like, and has simple synthesis process, no pollution and the like; by adjusting the content of the hyperbranched silicon-containing acrylate monomer and the catalyst, the UV and moisture curing rate can be improved to meet the packaging requirements of different types of touch screens, the defect that the shadow part or the bottom part of the hot melt adhesive film touch screen cannot be cured is avoided, and the problem of weak corner peeling strength in the field of black edges is solved.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

in order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.

drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 is a flow chart of the process for preparing the hot melt adhesive film of the present invention;

FIG. 2 is an infrared spectrum of a hyperbranched silicon-containing acrylate monomer of the invention;

FIG. 3 shows the CDCl of the hyperbranched silicon-containing acrylate monomer of the invention₃Hydrogen spectra in solution;

FIG. 4 is a GPC chart of a hyperbranched silicon-containing acrylate monomer of the invention in THF solution.

Detailed Description

To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

interpretation of custom nouns or English abbreviations:

UV: ultraviolet rays;

KH 550: KH550 type silane coupling agent with CAS number 919-30-2;

THF: tetrahydrofuran, a heterocyclic organic compound;

EVA resin: from nonpolar, crystalline vinyl monomers (C)₂H₄) And a strongly polar, noncrystalline vinyl acetate monomer (CH)₃COOC₂H₃) A thermoplastic resin obtained by high-pressure bulk polymerization in the presence of an initiator;

POE resin: a polymer blend comprised of octene and a polyolefin resin, the continuous phase and the dispersed phase exhibiting two phase separation;

triacrylate: acrylates containing three functional groups, such as glycerol triacrylate, trimethylolpropane triacrylate (TMPTA), or mixtures of the two; and trimethylolpropane triacrylate of the formula (CH)₂＝CHCOOCH₂)₃-CCH₂CH₃。