阅读说明：本技术 胶黏剂及其制备方法、防爆膜及其制备方法 (Adhesive and preparation method thereof, and explosion-proof membrane and preparation method thereof ) 是由 金闯 张玉伟 于 2019-10-14 设计创作，主要内容包括：本发明涉及一种胶黏剂及其制备方法、防爆膜及其制备方法。其中,胶黏剂包括如下质量份的各原料组分：丙烯酸丁酯40-50份、丙烯酸甲酯40-50份、丙烯酸羟乙酯0.1-10份、丙烯酸1-10份、溶剂100-300份、以及引发剂0.001-0.01份。上述胶黏剂中各原料组分配比合理,将作为软单体的丙烯酸丁酯、硬单体的丙烯酸甲酯和复配的丙烯酸羟乙酯和丙烯酸构成的功能单体按如上质量份合理组配,经实验验证,上述胶黏剂具有较低的初黏力、较高的剥离力,特别是在高温高湿环境下长期使用,仍保持较高的剥离力。(The invention relates to an adhesive and a preparation method thereof, and an explosion-proof membrane and a preparation method thereof. The adhesive comprises the following raw material components in parts by mass: 40-50 parts of butyl acrylate, 40-50 parts of methyl acrylate, 0.1-10 parts of hydroxyethyl acrylate, 1-10 parts of acrylic acid, 300 parts of solvent and 0.001-0.01 part of initiator. The adhesive has the advantages that the raw material components are reasonably mixed, the functional monomers consisting of butyl acrylate serving as a soft monomer, methyl acrylate serving as a hard monomer and compounded hydroxyethyl acrylate and acrylic acid are reasonably mixed according to the above parts by mass, and experiments prove that the adhesive has lower initial adhesion and higher stripping force, and particularly can still keep higher stripping force when being used for a long time in a high-temperature and high-humidity environment.)

1. The adhesive is characterized by comprising the following raw material components in parts by mass:

2. The adhesive of claim 1 wherein the initiator is selected from at least one of azobisisobutyronitrile and benzoyl peroxide.

3. The adhesive of claim 1 wherein the solvent is at least one of ethyl acetate, toluene and butanone.

4. A method for preparing the adhesive according to any one of claims 1 to 3, which comprises the following steps:

Weighing the raw material components according to the corresponding mass parts;

Mixing butyl acrylate, methyl acrylate, hydroxyethyl acrylate, acrylic acid and a solvent to obtain a mixture;

Adding the initiator to the mixture in stages and then mixing, wherein the adding the initiator to the mixture in stages comprises the following two stages: the first stage is as follows: adding a part of initiator into the mixture, and reacting at the temperature of 66-67 ℃ for 3-8 h; the second stage is as follows: continuously adding the rest initiator, reacting at 79-81 ℃ for 1-4 h, and cooling.

5. the method of claim 4, wherein in the step of the first stage, the mass ratio of the added initiator to the mixture is 0.001-0.1.

6. An rupture disk, comprising:

a substrate layer;

the adhesive layer is arranged on the surface of one side of the base material layer, and the raw material of the adhesive layer comprises the adhesive of any one of claims 1-3 or the adhesive prepared by the preparation method of the adhesive of any one of claims 4-5; and

and the release film layer is arranged on the surface of one side of the adhesive layer, which is far away from the base material layer.

7. the rupture membrane according to claim 6, wherein the rupture membrane has a peel force of 1400gf to 2100gf, and an initial adhesion of 400gf to 900 gf.

8. the preparation method of the explosion-proof membrane is characterized by comprising the following steps:

Forming an adhesive layer on a substrate layer, wherein the raw material of the adhesive layer comprises the adhesive of any one of claims 1 to 3 or the adhesive prepared by the preparation method of the adhesive of any one of claims 4 to 5;

and forming a release film layer on the adhesive layer, and curing.

9. the method for producing an explosion-proof membrane according to claim 8, wherein in the step of forming the adhesive layer on the base material layer, the adhesive according to any one of claims 1 to 3 or the adhesive produced by the method for producing an adhesive according to any one of claims 4 to 5 is applied to the base material layer and baked to form the adhesive layer.

10. The preparation method of the explosion-proof membrane according to claim 8 or 9, wherein the curing treatment condition is curing at 50-60 ℃ for 45-50 h.

Technical Field

The invention relates to the technical field of explosion-proof membranes, in particular to an adhesive and a preparation method thereof, and an explosion-proof membrane and a preparation method thereof.

background

Today, mobile phones are a necessity in daily life of people due to rapid development of the electronic industry. As one of the most important components of a mobile phone, people often use an explosion-proof membrane to protect the display screen so as to prevent the display screen of the mobile phone from being damaged or even burst due to external impact.

the adhesive used in the traditional explosion-proof membrane has high initial viscosity and low stripping force, and the stripping force is obviously reduced when the traditional explosion-proof membrane is used for a long time particularly in a high-temperature high-humidity environment, so that the explosion-proof membrane has poor reworking performance and is easy to degum in the high-temperature high-humidity environment. Therefore, the method has great application value and market value for the performance research of the important raw material adhesive contained in the explosion-proof membrane.

Disclosure of Invention

In view of the above, it is necessary to provide a novel adhesive capable of reducing initial adhesion and improving peeling strength, aiming at the problems of high initial adhesion and low peeling strength of the conventional adhesive.

The adhesive comprises the following raw material components in parts by mass:

In one embodiment, the initiator is selected from at least one of azobisisobutyronitrile and benzoyl peroxide.

In one embodiment, the solvent is at least one of ethyl acetate, toluene, and butanone.

The invention also discloses a preparation method of the adhesive, which comprises the following steps:

weighing the raw material components according to the corresponding mass parts;

mixing butyl acrylate, methyl acrylate, hydroxyethyl acrylate, acrylic acid and a solvent to obtain a mixture;

Adding the initiator to the mixture in stages and then mixing, wherein the adding the initiator to the mixture in stages comprises the following two stages: the first stage is as follows: adding a part of initiator into the mixture, and reacting at the temperature of 66-67 ℃ for 3-8 h; the second stage is as follows: continuously adding the rest initiator, reacting at 79-81 ℃ for 1-4 h, and cooling.

In one embodiment, in the step of the first stage, the mass ratio of the initiator to the mixture is added in the range of 0.001 to 0.1.

the present invention also provides an explosion-proof membrane, comprising:

a substrate layer;

the adhesive layer is arranged on the surface of one side of the base material layer, and the raw material of the adhesive layer comprises the adhesive disclosed by any one of the invention or the adhesive prepared by the preparation method of the adhesive disclosed by any one of the invention; and

and the release film layer is arranged on the surface of one side of the adhesive layer, which is far away from the base material layer.

In one embodiment, the rupture disk has a peel force of 1400gf to 2100gf, and an initial adhesion of 400gf to 900 gf.

the invention also provides a preparation method of the explosion-proof membrane, which comprises the following steps:

forming an adhesive layer on the substrate layer, wherein the raw material of the adhesive layer comprises the adhesive disclosed by any one of the invention or the adhesive prepared by the preparation method of the adhesive disclosed by any one of the invention;

And forming a release film layer on the adhesive layer, and curing.

In one embodiment, in the step of forming the adhesive layer on the substrate layer, the adhesive prepared by the adhesive according to any one of the present invention or the preparation method of the adhesive according to any one of the present invention is coated on the substrate layer, and baked to form the adhesive layer.

In one embodiment, the curing treatment condition is curing at 50-60 ℃ for 45-50 h.

the adhesive has reasonable raw material component proportion, and the functional monomers consisting of butyl acrylate serving as a soft monomer, methyl acrylate serving as a hard monomer and compounded hydroxyethyl acrylate and acrylic acid are reasonably combined according to the mass parts, so that the initial adhesion of the adhesive is reduced, the stripping force of the adhesive is improved, and the adhesive can still keep higher stripping force after being used for a long time in a high-temperature and high-humidity environment. The applicant finds that acrylic acid and hydroxyethyl acrylate are used as functional monomers for subsequent crosslinking with a curing agent, have higher polarity, can form hydrogen bonds, have much higher hydrogen bond content than that of a conventional acrylic crosslinking agent, and finally the polymer obtained by synthesis has extremely high cohesive force due to the action of the hydrogen bonds, so that an explosion-proof film obtained by subsequent coating has lower initial adhesion, the cohesive force of an adhesive can be improved, the strength of the whole adhesive layer is better, the explosion-proof film can be completely uncovered during reworking, and the stripping force is higher.

experiments prove that the adhesive has lower initial adhesion and higher peeling force, and particularly can still keep higher peeling force when used for a long time in a high-temperature and high-humidity environment.

Detailed Description

the present invention will be described in detail with reference to the following embodiments in order to make the aforementioned objects, features and advantages of the invention more comprehensible. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

the embodiment of the invention provides an adhesive which comprises the following raw material components in parts by mass:

In one embodiment, the initiator is selected from at least one of azobisisobutyronitrile and benzoyl peroxide.

in one embodiment, the solvent is at least one of ethyl acetate, toluene, and butanone.

The adhesive has reasonable raw material component proportion, and the functional monomers consisting of butyl acrylate serving as a soft monomer, methyl acrylate serving as a hard monomer and compounded hydroxyethyl acrylate and acrylic acid are reasonably combined according to the mass parts, so that the initial adhesion of the adhesive is reduced, the stripping force of the adhesive is improved, and the adhesive can still keep higher stripping force after being used for a long time in a high-temperature and high-humidity environment. The applicant finds that acrylic acid and hydroxyethyl acrylate are used as functional monomers for subsequent crosslinking with a curing agent, have higher polarity, can form hydrogen bonds, have much higher hydrogen bond content than that of a conventional acrylic crosslinking agent, and finally the polymer obtained by synthesis has extremely high cohesive force due to the action of the hydrogen bonds, so that an explosion-proof film obtained by subsequent coating has lower initial adhesion, the cohesive force of an adhesive can be improved, the strength of the whole adhesive layer is better, the explosion-proof film can be completely uncovered during reworking, and the stripping force is higher.

Experiments prove that the adhesive has lower initial adhesion and higher peeling force, and particularly can still keep higher peeling force when used for a long time in a high-temperature and high-humidity environment.

The invention also provides a preparation method of the adhesive, which comprises the following steps:

S1, weighing the raw material components according to the corresponding parts by mass, wherein the raw material components are weighed as follows:

S2, mixing butyl acrylate, methyl acrylate, hydroxyethyl acrylate, acrylic acid and a solvent according to the proportion of the raw materials to obtain a mixture.

s3, adding the initiator to the mixture in stages and then mixing, wherein the adding the initiator to the mixture in stages comprises the following two stages: the purpose of the first stage of initiator addition is to generate free radicals in the mixture to initiate the chemical reaction. Specifically, the first stage is: adding a part of initiator into the mixture, and reacting at the temperature of 66-67 ℃ for 3-8 h.

In one embodiment, in the step of the first stage, the mass ratio of the initiator to the mixture is added in the range of 0.001 to 0.1.

The purpose of the second stage of initiator addition is to react the residual acrylic monomer to completion. Specifically, the second stage is: and continuously adding the rest of the initiator, and reacting at the temperature of 79-81 ℃ for 1-4 h.

The preparation method of the adhesive is simple, the initiator is introduced twice in stages to enable the hard acrylic monomer, the soft acrylic monomer and the functional monomer to fully react, and the obtained adhesive has low initial adhesion and high stripping force. Particularly, the high-temperature and high-humidity environment can still keep high peeling force after being used for a long time.

The present invention also provides an explosion-proof membrane, comprising:

a substrate layer;

The adhesive layer is arranged on the surface of one side of the base material layer, and the raw material of the adhesive layer comprises the adhesive disclosed by any one of the invention or the adhesive prepared by the preparation method of the adhesive disclosed by any one of the invention; and

and the release film layer is arranged on the surface of one side of the adhesive layer, which is far away from the base material layer.

In one embodiment, the material of the substrate layer is polyethylene terephthalate (PET).

In one embodiment, the thickness of the substrate layer is 45 μm to 55 μm.

In one embodiment, the rupture disk has a peel force of 1400gf to 2100gf, and an initial adhesion of 400gf to 900 gf.

The explosion-proof membrane has the characteristics of high light transmittance, small yellowing index, good reworkability and boiling resistance, namely, the problem of degumming difficulty under the condition of manually simulating a high-temperature and high-humidity environment.

The invention also provides a preparation method of the explosion-proof membrane, which comprises the following steps:

Forming an adhesive layer on the substrate layer, wherein the raw material of the adhesive layer comprises the adhesive disclosed by any one of the invention or the adhesive prepared by the preparation method of the adhesive disclosed by any one of the invention;

and forming a release film layer on the adhesive layer, and curing.

Specifically, in the step of forming the adhesive layer on the substrate layer, the adhesive according to any one of the present invention or the adhesive prepared by the preparation method of the adhesive according to any one of the present invention is coated on the substrate layer, and baked to form the adhesive layer. Further, coating was performed using a manual doctor blade or comma blade.

specifically, in the step of forming a release film layer on the adhesive layer, the release film layer is attached to the adhesive layer.

In one embodiment, the curing treatment condition is curing at 50-60 ℃ for 45-50 h.

It can be understood that the application field of the above-mentioned rupture membrane is not limited, and it may be a mobile phone rupture membrane, an automobile rupture membrane, etc.

the preparation method of the anti-explosion membrane is simple, and the prepared anti-explosion membrane has the characteristics of high light transmittance, small yellowing index, good reworkability and boiling resistance, namely the anti-explosion membrane is not easy to degum under the condition of manually simulating a high-temperature and high-humidity environment.

in order that the objects and advantages of the invention will be more clearly understood, the invention is further described in detail below with reference to examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.