阅读说明：本技术 一种透气膜用热熔压敏胶及其制备方法 (Hot-melt pressure-sensitive adhesive for breathable film and preparation method thereof ) 是由 史云霓 朱志祥 王敏 于 2020-05-18 设计创作，主要内容包括：本发明涉及一种透气膜用热熔压敏胶及其制备方法,所述热熔压敏胶由包括以下组分及重量份含量的原料制备而成：热塑性弹性体20-45份、增韧环氧树脂8-20份、增粘树脂20-35份、功能化改性石墨烯0.5-5份、抗氧化剂0.1-1份以及交联剂1-5份；本发明制备工艺步骤简单,可控性好,制得的热熔压敏胶耐温性良好,且与聚乙烯类材料具有稳定粘结性,初粘力高、持粘力好,具有很好的应用前景。(The invention relates to a hot-melt pressure-sensitive adhesive for a breathable film and a preparation method thereof, wherein the hot-melt pressure-sensitive adhesive is prepared from the following raw materials in parts by weight: 20-45 parts of thermoplastic elastomer, 8-20 parts of toughened epoxy resin, 20-35 parts of tackifying resin, 0.5-5 parts of functionalized modified graphene, 0.1-1 part of antioxidant and 1-5 parts of cross-linking agent; the preparation process provided by the invention is simple in steps and good in controllability, and the prepared hot-melt pressure-sensitive adhesive is good in temperature resistance, stable in adhesion with polyethylene materials, high in initial adhesion, good in permanent adhesion and good in application prospect.)

1. The hot-melt pressure-sensitive adhesive for the breathable film is characterized by being prepared from the following raw materials in parts by weight: 20-45 parts of thermoplastic elastomer, 8-20 parts of toughened epoxy resin, 20-35 parts of tackifying resin, 0.5-5 parts of functionalized modified graphene, 0.1-1 part of antioxidant and 1-5 parts of cross-linking agent.

2. The hot-melt pressure-sensitive adhesive for breathable films according to claim 1, wherein the preparation method of the toughened epoxy resin comprises the following steps:

step A): preparing the following components in parts by weight: 80-90 parts of epoxy resin, 20-40 parts of toughened elastomer, 10-30 parts of compatilizer, 0.3-1 part of coupling agent and 0.5-2 parts of processing aid;

step B): uniformly mixing the toughened elastomer, 50-60% of compatilizer, coupling agent and processing aid by weight in a hot melting way at the temperature of 120-150 ℃, preserving the heat for 15-45 minutes, then adding epoxy resin while stirring, and naturally cooling to room temperature after uniform mixing to prepare premix;

step C): heating the rest of the compatilizer until the viscosity is 500 centipoise, and uniformly mixing the compatilizer with the premix prepared in the step B).

3. The hot melt pressure sensitive adhesive for breathable films according to claim 2, wherein the epoxy resin is selected from one or two of bisphenol a epoxy resin and novolac epoxy resin, the toughening elastomer is selected from one or two of styrene-butadiene-styrene block copolymer and styrene-isoprene-styrene block copolymer, the compatibilizer is selected from coumarone resin, the coupling agent is selected from silane coupling agent KH560, and the processing aid is selected from any one of calcium stearate, sodium stearate or zinc stearate.

4. The hot-melt pressure-sensitive adhesive for breathable films according to claim 1, wherein the functionalized modified graphene is obtained by modifying the surface of graphene by using a silane coupling agent.

5. The hot-melt pressure-sensitive adhesive for the breathable film according to claim 1, wherein the thermoplastic elastomer is formed by mixing a polyolefin thermoplastic elastomer and a fluorine-containing thermoplastic elastomer according to a mass ratio of 10: 1-5.

6. The hot-melt pressure-sensitive adhesive for breathable films according to claim 5, wherein the polyolefin-based thermoplastic elastomer is one or two selected from styrene-ethylene-propylene-styrene block copolymers and ethylene-octene copolymers.

7. The hot-melt pressure-sensitive adhesive for breathable films according to claim 1, wherein the tackifying resin is one or more selected from petroleum resin, terpene phenolic resin, rosin ester and rosin.

8. The hot melt pressure sensitive adhesive for breathable films according to claim 1, wherein the antioxidant is at least one selected from the group consisting of tetrakis [ methyl- β - (3, 5-di-t-butyl-4-hydroxyphenyl) propionate ] pentaerythritol ester, 2, 6-di-t-butyl-p-cresol, tris [2, 4-di-t-butylphenyl ] phosphite and dilaurylthiodipropionate.

9. The hot melt pressure sensitive adhesive for breathable films according to claim 1, wherein the crosslinking agent is at least one selected from the group consisting of diethylenetriamine, t-butylperoxyethane and hexamethylenetetramine.

10. A method for producing a hot-melt pressure-sensitive adhesive for breathable films according to any one of claims 1 to 9, comprising the steps of:

step 1): adding 40-50% of tackifying resin, toughening epoxy resin, functionalized modified graphene, antioxidant and cross-linking agent into a kneader according to parts by weight;

step 2): and heating the kneader to 150-180 ℃, preserving the heat for 15-60 minutes, adding the rest tackifying resin and the thermoplastic elastomer into the kneader according to the parts by weight, kneading the mixture at 150-180 ℃ for 30-60 minutes, melting and mixing the mixture uniformly, and cooling the mixture to room temperature.

Technical Field

The invention belongs to the technical field of high-molecular adhesives, and relates to a hot-melt pressure-sensitive adhesive for a breathable film and a preparation method thereof.

Background

As is well known, hot melt pressure sensitive adhesives are one type of pressure sensitive adhesives, and are mainly a new type of adhesive tape made of synthetic rubber, resin, rubber oil, etc. which are mixed and heated to a molten state and then applied to a base material such as tissue paper, cloth, or plastic film. In particular, hot melt pressure sensitive adhesives have both hot melt and pressure sensitive properties. The adhesive can be changed into liquid when heated to 130-200 ℃, can be used by spraying, rolling, blade coating and other methods, is solid when cooled to room temperature, and can generate good bonding effect by applying certain pressure. The greatest advantage of hot-melt pressure-sensitive adhesives is their low cost, but they have the disadvantage that the viscosity is influenced significantly by temperature. This also greatly limits the application of hot melt pressure sensitive adhesives.

For example, in the production process of the breathable film, the hot-melt pressure-sensitive adhesive needs to be sprayed or blade-coated, but because the hot-melt pressure-sensitive adhesive has poor heat resistance, for example, the hot-melt pressure-sensitive adhesive can only bear the temperature of 60 ℃, the double-sided adhesive tape has almost no viscosity in winter and can be layered, but the adhesive on the surface of the double-sided adhesive tape can be thermally adhered in summer, so that the popularization and application of the breathable film are greatly restricted.

Therefore, there is a need to develop a hot-melt pressure-sensitive adhesive for breathable films, which is suitable for breathable films, has outstanding heat-resistant stability, good low-temperature flexibility, high initial adhesion and good permanent adhesion.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide the hot-melt pressure-sensitive adhesive for the breathable film, which has good temperature resistance, stable adhesion with polyethylene materials, high initial adhesion and good permanent adhesion.

The invention also aims to provide a preparation method of the hot melt pressure sensitive adhesive.

The purpose of the invention can be realized by the following technical scheme:

the hot-melt pressure-sensitive adhesive for the breathable film is prepared from the following raw materials in parts by weight: 20-45 parts of thermoplastic elastomer, 8-20 parts of toughened epoxy resin, 20-35 parts of tackifying resin, 0.5-5 parts of functionalized modified graphene, 0.1-1 part of antioxidant and 1-5 parts of cross-linking agent.

The preparation method of the toughened epoxy resin comprises the following steps:

step A): preparing the following components in parts by weight: 80-90 parts of epoxy resin, 20-40 parts of toughened elastomer, 10-30 parts of compatilizer, 0.3-1 part of coupling agent and 0.5-2 parts of processing aid;

step B): uniformly mixing the toughened elastomer, 50-60% of compatilizer, coupling agent and processing aid by weight in a hot melting way at the temperature of 120-150 ℃, preserving the heat for 15-45 minutes, then adding epoxy resin while stirring, and naturally cooling to room temperature after uniform mixing to prepare premix;

step C): heating the rest of the compatilizer until the viscosity is 500 centipoise, and uniformly mixing the compatilizer with the premix prepared in the step B).

The epoxy resin is selected from one or two of bisphenol A epoxy resin or novolac epoxy resin, the toughening elastomer is selected from one or two of styrene-butadiene-styrene block copolymer or styrene-isoprene-styrene block copolymer, the compatilizer is selected from coumarone resin, the coupling agent is selected from silane coupling agent KH560, and the processing aid is selected from any one of calcium stearate, sodium stearate or zinc stearate.

The functionalized modified graphene is obtained by modifying the surface of graphene by adopting a silane coupling agent.

The thermoplastic elastomer is formed by mixing a polyolefin thermoplastic elastomer and a fluorine-containing thermoplastic elastomer according to a mass ratio of 10: 1-5.

The polyolefin thermoplastic elastomer is one or two selected from styrene-ethylene-propylene-styrene block copolymer or ethylene-octene copolymer.

The tackifying resin is selected from one or more than two of petroleum resin, terpene phenolic resin, rosin ester or rosin.

The antioxidant is at least one of tetra [ methyl-beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate ] pentaerythritol ester, 2, 6-di-tert-butyl-p-cresol, tris [2, 4-di-tert-butylphenyl ] phosphite or dilauryl thiodipropionate.

The crosslinking agent is at least one selected from diethylenetriamine, tert-butylperoxyethane or hexamethylenetetramine.

A preparation method of a hot-melt pressure-sensitive adhesive for a breathable film comprises the following steps:

step 1): adding 40-50% of tackifying resin, toughening epoxy resin, functionalized modified graphene, antioxidant and cross-linking agent into a kneader according to parts by weight;

step 2): and heating the kneader to 150-180 ℃, preserving the heat for 15-60 minutes, adding the rest tackifying resin and the thermoplastic elastomer into the kneader according to the parts by weight, kneading the mixture at 150-180 ℃ for 30-60 minutes, melting and mixing the mixture uniformly, and cooling the mixture to room temperature.

Compared with the prior art, the invention has the following characteristics:

1) the thermoplastic elastomer is taken as a matrix, the introduction of the toughened epoxy resin is beneficial to improving the heat-resistant stability of a material system, and the toughened epoxy resin is toughened and modified by the toughened elastomer, so that the compatibility between the epoxy resin and the thermoplastic elastomer can be improved, and the toughened epoxy resin in the matrix can block and passivate the expansion of cracks, so that the low-temperature flexibility of the material system is improved;

2) the functionalized graphene is introduced into the thermoplastic elastomer matrix, and the surface of the graphene is modified by the silane coupling agent, so that the dispersibility of the graphene in the thermoplastic elastomer can be effectively improved, the phenomenon of graphene agglomeration can be effectively prevented, the thermal stability of the material system in a high-temperature environment can be further improved, the phenomenon of thermal adhesion can be effectively prevented, and the negative influence on the toughness of the material system due to the introduction of the graphene can be offset due to the introduction of the toughening epoxy resin;

3) the thermoplastic elastomer is an elastomer compounded by the polyolefin thermoplastic elastomer and the fluorine-containing thermoplastic elastomer, the polyolefin thermoplastic elastomer can ensure the cohesiveness of the matrix to polyethylene materials, and the fluorine-containing thermoplastic elastomer can improve the chemical resistance and the stain resistance of the matrix, thereby being beneficial to improving the service life of the colloid;

4) the preparation process has simple steps and good controllability, and the prepared hot-melt pressure-sensitive adhesive has good temperature resistance, stable adhesion with polyethylene materials, high initial adhesion, good permanent adhesion and good application prospect.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to specific embodiments, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed embodiment and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments. All other embodiments obtained by a person skilled in the art without making any inventive step are within the scope of protection of the present invention.

The endpoints of the ranges and any values disclosed herein are not limited to the precise range or value, and such ranges or values should be understood to encompass values close to those ranges or values. For ranges of values, between the endpoints of each of the ranges and the individual points, and between the individual points may be combined with each other to give one or more new ranges of values, and these ranges of values should be considered as specifically disclosed herein. For example, "a range of from 1 to 10" should be understood to mean every and every possible number in succession between about 1 and about 10. Thus, even if specific data points within the range, or even no data points within the range, are explicitly identified or refer to only a few specific points, it is to be understood that any and all data points within the range are to be considered explicitly stated.

In particular embodiments, unless specifically stated otherwise, all materials or processing techniques are conventional in the art, and are intended to be commercially available.