阅读说明：本技术 一种特种压敏胶粘剂组合物及其胶带的制备方法 (Special pressure-sensitive adhesive composition and preparation method of adhesive tape thereof ) 是由 夏有贵 王凯 龙冲 于 2019-09-29 设计创作，主要内容包括：本发明涉及一种特种压敏胶粘剂组合物及其胶带的制备方法,采用极性橡胶接枝长链烷基酯体系,配合极性增粘树脂及极性液体橡胶组成,使得整个体系具有极性的同时,部分接枝侧链也具有一定的非极性,不仅有利于胶黏剂整体的耐生活试剂性能,同时还可以提供对不同表面能材质的粘结强度；上述极性橡胶体系,既体现了橡胶的延伸率和回弹性,利于提高胶黏剂的缓冲性能,同时在保证对塑料材质等非极性制件的高粘结强度同时,又提高了对金属板的粘结强度；整个胶带由一层特高粘橡胶胶黏剂层构成,厚度只有50μm左右,相比传统泡棉胶带,具有更薄、更粘的特性,可以部分取代现有传统型“三明治”结构缓冲泡棉胶带。(The invention relates to a special pressure-sensitive adhesive composition and a preparation method of an adhesive tape thereof, wherein a polar rubber grafted long-chain alkyl ester system is adopted, and a polar tackifying resin and a polar liquid rubber are matched to form the special pressure-sensitive adhesive composition, so that the whole system has polarity, and part of grafted side chains also have certain non-polarity, thereby being beneficial to the integral life reagent resistance of an adhesive and simultaneously providing the adhesive strength to materials with different surface energies; the polar rubber system not only embodies the elongation and rebound resilience of rubber and is beneficial to improving the buffering performance of the adhesive, but also improves the bonding strength to a metal plate while ensuring the high bonding strength to non-polar parts such as plastic materials and the like; the whole adhesive tape is composed of a layer of extra-high viscosity rubber adhesive, the thickness is only about 50 micrometers, compared with the traditional foam adhesive tape, the adhesive tape has the characteristics of thinness and stickiness, and the traditional sandwich-structure buffering foam adhesive tape can be partially replaced.)

1. A special pressure-sensitive adhesive composition is characterized by comprising, by mass, 100 parts of polar rubber, 8 ~ 20 parts of long-chain (methyl) alkyl ester, 1 ~ 5 parts of functional monomer, 0.1 ~ 1.5.5 parts of initiator, 50 ~ 80 parts of polar tackifying resin, 1 ~ 20 parts of polar softener, 0.5 ~ 2 parts of antioxidant, 0.1 ~ 0.5 parts of light stabilizer and 500 ~ 600 parts of solvent, wherein the preparation method comprises the steps of preparing a four-mouth reaction bottle, adding the solvent, starting stirring, adding sliced polar rubber, heating to 45 ℃, simultaneously introducing nitrogen, adding the long-chain (methyl) alkyl ester and the functional monomer after stirring for 3 hours to be completely dissolved, uniformly stirring, heating to 80 ~ 82 ℃, adding the initiator diluted by toluene for timed reaction, stopping introducing the nitrogen after continuously stirring for 4 hours, ending the reaction, then adding the antioxidant, the light stabilizer, the polar tackifying resin and the polar softener, stirring, dissolving, cooling and discharging, and the special pressure-sensitive adhesive composition is obtained.

2. A specialty pressure sensitive adhesive composition as claimed in claim 1 wherein: the polar rubber is any one of fluororubber, nitrile rubber, chloroprene rubber and chlorosulfonated polyethylene rubber.

3. The special pressure-sensitive adhesive composition as claimed in claim 2, wherein the polar rubber is nitrile rubber having an acrylonitrile content of 18 ~ 35% and a Mooney viscosity of 20 ~ 60%.

4. A specialty pressure sensitive adhesive composition as claimed in claim 1 wherein:

the long-chain (methyl) alkyl ester is one or more of isooctyl (methyl) acrylate, dodecyl (lauryl) acrylate, hexadecyl (methyl) acrylate, octadecyl (methyl) acrylate, heptadecafluorononyl (methyl) acrylate, heptadecafluorodecyl (methyl) acrylate and dodecafluoroheptyl (methyl) acrylate;

the functional monomer is a monomer containing carboxyl or hydroxyl, and the monomer containing carboxyl or hydroxyl is any one or more of (methyl) acrylic acid, itaconic acid, phthalic anhydride, maleic acid, fumaric acid, hydroxyethyl (methyl) acrylate and hydroxypropyl (methyl) acrylate.

5. A specialty pressure sensitive adhesive composition as claimed in claim 1 wherein said polar tackifying resin is a terpene phenolic resin having a softening point of 100-150 ℃, a melt viscosity of 500 ~ 1500mPa · s, a molecular weight of 500 ~ 1500, and a glass transition temperature of 90 ~ 120 ℃.

6. A specialty pressure sensitive adhesive composition as claimed in claim 1 wherein: the polar softener is liquid rubber, and the liquid rubber is any one or more of liquid polysulfide rubber, liquid nitrile rubber and liquid fluororubber.

7. A specialty pressure sensitive adhesive composition as claimed in claim 6 wherein said polar softener is liquid nitrile rubber having a molecular weight of 300 ~ 700.

8. A specialty pressure sensitive adhesive composition as claimed in claim 1 wherein: the antioxidant is any one or more of 4010NA, RD, MB, 2' -dimethylene bis- (4-methyl-6-tert-butylphenol), octadecyl-3, 5-bis (1, 1-dimethylethyl) -4-hydroxyphenyl propionate and tetra [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid ] pentaerythritol ester;

the light stabilizer is any one or more of o-hydroxybenzophenone, benzotriazole, salicylate, triazine, substituted acrylonitrile and hindered amine;

the solvent is any one or more of ethyl acetate, butyl acetate, methyl isobutyl ketone, isophorone, acetone, butanone, cyclohexanone, toluene, xylene, n-heptane, cyclohexane and No. 120 solvent oil.

9. A preparation method of a high-bonding-strength life-test-resistant non-base-material ultrathin double-sided adhesive tape is characterized by comprising the following steps of: firstly, coating the special pressure-sensitive adhesive composition as claimed in any one of claims 1 to 8 on the release surface of the PET release film, baking the PET release film in an oven at 110 ℃ for 5min to form a pressure-sensitive coating with the thickness of 50 microns, and finally attaching the release film on the surface of the pressure-sensitive coating to obtain the high-bonding-strength life-test-reagent-resistant substrate-free ultrathin double-sided tape.

Technical Field

The invention belongs to the technical field of adhesive materials, and relates to a special pressure-sensitive adhesive composition and a preparation method of an adhesive tape thereof.

Background

The adhesive tape is used as an adhesive material and has special applications such as fixing and bonding of materials, surface protection and the like. Nowadays, with the updating and upgrading of the electronic industry, the requirement on the electronic adhesive tape is higher and higher, and more electronic application occasions provide that the adhesive tape not only needs high bonding strength, but also has a requirement on firm bonding of different surface energy materials, and further has further requirements such as life-resistant reagents and the like, such as laundry detergent, sweat, alcohol, food grease and the like, which can not be met by most common adhesive tapes. Some high-bonding-strength adhesive tapes, such as VHB (vinyl butyral) adhesive tapes produced by 3M (high-strength) have appeared on the market, the foam adhesive tape mainly comprises a middle foam structure layer and high-strength acrylic pressure-sensitive adhesives with high, medium and low surface energy types coated on two surfaces, the acrylic pressure-sensitive adhesives provide high bonding strength, the middle foam layer provides stress dispersion, different surface energy materials can be bonded, and the bonding is firmer; and as the AB type double-sided adhesive in the market, adhesives with different surface energies are coated on two sides of the PET film substrate, so that middle-low surface energy plastics and high surface energy metal plates can be bonded. As mentioned above, the adhesive tapes with high adhesive strength, which can bond different surface energy materials, such as VHB foam tapes produced by 3M, have high adhesive strength and good stress dispersibility, but have the problem of intolerance to living agents; and like the high-bonding-strength AB adhesive tape, different surface energy materials can be well bonded, but the living reagent resistance is poor, and meanwhile, the stress of the adhesive tape is easy to concentrate, so that the bonding durability is reduced.

Therefore, there is a need for a special pressure-sensitive adhesive composition and tape having high adhesive strength, good resistance to living agents, and suitable for ultra-thin adhesive applications.

Disclosure of Invention

The invention aims to invent a special pressure-sensitive adhesive composition and a preparation method of an adhesive tape thereof, and solve the technical problems.

The technical scheme adopted by the invention for solving the technical problems is as follows: the special pressure-sensitive adhesive composition comprises the following components in parts by mass: 100 parts of polar rubber; 8-20 parts of long-chain (methyl) alkyl ester; 1-5 parts of a functional monomer; 0.1-1.5 parts of an initiator; 50-80 parts of polar tackifying resin; 1-20 parts of a polar softener; 0.5-2 parts of an antioxidant; 0.1-0.5 part of light stabilizer; 500-600 parts of solvent, the preparation method comprises the steps of preparing a four-mouth reaction bottle, adding the solvent, starting stirring, adding sliced polar rubber, heating to 45 ℃, introducing nitrogen, adding long-chain (methyl) alkyl ester and functional monomers after stirring for 3 hours to completely dissolve, uniformly stirring, heating to 80-82 ℃, adding an initiator diluted by toluene to start a timed reaction, continuously stirring for 4 hours, stopping introducing the nitrogen to end the reaction, adding an antioxidant, a light stabilizer, polar tackifying resin and a polar softener, stirring, dissolving, cooling and discharging, and thus obtaining the special pressure-sensitive adhesive composition.

As a preferred embodiment of the present invention, the polar rubber is any one of fluororubber, nitrile rubber, chloroprene rubber, and chlorosulfonated polyethylene rubber.

As a preferred embodiment of the present invention, the polar rubber is any one of fluororubber, nitrile rubber, chloroprene rubber, and chlorosulfonated polyethylene rubber.

As a preferred embodiment of the present invention, the long-chain (meth) alkyl ester is any one or more of isooctyl (meth) acrylate, dodecyl (lauryl) acrylate, hexadecyl (meth) acrylate, octadecyl (meth) acrylate, heptadecafluorononyl (meth) acrylate, heptadecafluorodecyl (meth) acrylate, dodecafluoroheptyl (meth) acrylate;

the functional monomer is a monomer containing carboxyl or hydroxyl, and the monomer containing carboxyl or hydroxyl is any one or more of (methyl) acrylic acid, itaconic acid, phthalic anhydride, maleic acid, fumaric acid, hydroxyethyl (methyl) acrylate and hydroxypropyl (methyl) acrylate.

As a preferred embodiment of the invention, the polar tackifying resin is terpene phenolic resin, the softening point is 100-150 ℃, the melt viscosity is 500-1500 mPas, the molecular weight is 500-1500, and the glass transition temperature is 90-120 ℃.

As a preferred embodiment of the present invention, the polar softener is liquid rubber, and the liquid rubber is any one or more of liquid polysulfide rubber, liquid nitrile rubber, and liquid fluororubber.

As a preferred embodiment of the invention, the polar softener is liquid nitrile rubber, and the molecular weight of the polar softener is 300-700.

As a preferred embodiment of the present invention, the antioxidant is any one or more of 4010NA, RD, MB, 2' -dimethylenebis- (4-methyl-6-tert-butylphenol), octadecyl-3, 5-bis (1, 1-dimethylethyl) -4-hydroxyphenylpropionate, and pentaerythritol tetrakis [ β - (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate ];

the light stabilizer is any one or more of o-hydroxybenzophenone, benzotriazole, salicylate, triazine, substituted acrylonitrile and hindered amine;

the solvent is any one or more of ethyl acetate, butyl acetate, methyl isobutyl ketone, isophorone, acetone, butanone, cyclohexanone, toluene, xylene, n-heptane, cyclohexane and No. 120 solvent oil.

The application also provides a preparation method of the high-bonding-strength and life-test-resistance-agent-type substrate-free ultrathin double-sided tape, which comprises the steps of firstly coating the special pressure-sensitive adhesive composition as defined in any one of claims 1-8 on a release surface of a PET release film, baking the release surface for 5min in an oven at 110 ℃ to form a pressure-sensitive coating with the thickness of 50 microns, and finally attaching the release film to the surface of the pressure-sensitive coating to obtain the high-bonding-strength and life-test-resistance-agent-type substrate-free ultrathin double-sided tape.

The special pressure-sensitive adhesive composition and the preparation method of the adhesive tape thereof have the advantages of high bonding strength, good living reagent resistance and good buffer performance, and can bond medium, low and high surface energy materials, and the special pressure-sensitive adhesive composition has the following beneficial effects:

1. the living reagent mainly comprises nonpolar liquid such as grease and sweat, and some polar reagents such as alcohol and water, the rubber system is generally a nonpolar material, the principle that the polar material and the nonpolar material repel each other is utilized, the whole adhesive adopts a polar rubber grafted long-chain alkyl ester system, and is matched with polar tackifying resin and polar liquid rubber to form the adhesive, so that the whole system has polarity, and part of grafted side chains also have certain nonpolar, thereby being beneficial to the whole life reagent resistance of the adhesive and providing the bonding strength to different surface energy materials;

2. the polar rubber system not only embodies the elongation and rebound resilience of rubber and is beneficial to improving the buffering performance of the adhesive, but also improves the bonding strength to a metal plate while ensuring the high bonding strength to non-polar parts such as plastic materials and the like;

3. the whole adhesive tape is composed of a layer of extra-high viscosity rubber adhesive, the thickness is only about 50 micrometers, compared with the traditional foam adhesive tape, the adhesive tape has the characteristics of thinness and stickiness, and the traditional sandwich-structure buffering foam adhesive tape can be partially replaced.

Detailed Description

The special pressure-sensitive adhesive composition prepared by the invention comprises the following components in parts by mass: 100 parts of polar rubber, 8-20 parts of long-chain (methyl) alkyl ester, 1-5 parts of functional monomer, 0.1-1.5 parts of initiator, 50-80 parts of polar tackifying resin, 1-20 parts of polar softener, 0.5-2 parts of antioxidant, 0.1-0.5 part of light stabilizer and 500-600 parts of solvent. Firstly, preparing a four-mouth reaction bottle, adding a solvent, starting stirring, then adding sliced polar rubber, heating to about 45 ℃, simultaneously introducing nitrogen, after stirring for 3 hours and completely dissolving, adding long-chain (methyl) alkyl ester, functional monomers and the like, uniformly stirring, heating to 80-82 ℃, then adding an initiator (diluted by toluene) to start timing reaction, continuously stirring for 4 hours, stopping introducing nitrogen to finish the reaction, then adding an antioxidant, a light stabilizer, a polar tackifying resin and a softening agent, stirring, dissolving, cooling and discharging to obtain the rubber modified adhesive with high bonding strength.

In the above formulation: the polar rubber is fluororubber, nitrile rubber, chloroprene rubber, chlorosulfonated polyethylene rubber and the like, preferably nitrile rubber, the acrylonitrile content of the polar rubber is 18-35%, and the Mooney viscosity of the polar rubber is 20-60; the long-chain alkyl (methyl) ester can be one or more of isooctyl (methyl) acrylate, dodecyl (lauryl) acrylate, hexadecyl (methyl) acrylate, octadecyl (methyl) acrylate, heptadecyl fluorononyl (methyl) acrylate, heptadecyl (methyl) acrylate and dodecafluoro heptyl (methyl) acrylate; the functional monomer is mainly a monomer containing carboxyl or hydroxyl, such as one or more of (meth) acrylic acid, itaconic acid, phthalic anhydride, maleic acid, fumaric acid, hydroxyethyl (meth) acrylate and hydroxypropyl (meth) acrylate; the polar tackifying resin is terpene phenolic resin, the softening point is 100-150 ℃, the melt viscosity is 500-1500 mPa & s, the molecular weight is 500-1500, and the glass transition temperature is 90-120 ℃; the polar softener is liquid rubber, such as liquid polysulfide rubber, liquid nitrile rubber, liquid fluororubber and the like, and preferably liquid nitrile rubber with the molecular weight of 300-700; the antioxidant is one or more of 4010NA, RD, MB, 2' -dimethylene bis- (4-methyl-6-tert-butylphenol), octadecyl-3, 5-bis (1, 1-dimethylethyl) -4-hydroxyphenyl propionate (1076), and pentaerythritol tetrakis [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate (1010); the light stabilizer mainly comprises o-hydroxybenzophenone, benzotriazole, salicylate, triazine, substituted acrylonitrile and hindered amine; further, the light stabilizer is selected from one or more of UV-2, UV-328, UV-292, UV-326, UV-328, UV-944, UV-1577 and UV-144; the solvent is one or more of ethyl acetate, butyl acetate, methyl isobutyl ketone, isophorone, acetone, butanone, cyclohexanone, toluene, xylene, n-heptane, cyclohexane, 120# solvent oil, etc.

Therefore, the preparation method of the substrate-free ultrathin double-sided tape with high bonding strength and good life reagent resistance can be prepared, the special adhesive (the adhesive layer is prepared from the rubber modified adhesive) is coated on the release surface of the PET release film, the PET release film is baked for 5min at 110 ℃ to form a pressure-sensitive coating with the thickness of about 50 microns, and the release film is attached to the surface of the pressure-sensitive coating, so that the substrate-free ultrathin double-sided tape with high bonding strength and good life reagent resistance can be obtained.

The present invention will be further described with reference to specific examples, but the scope of the present invention is not limited to these examples.