Buffering PSA adhesive film with columnar array air bags and preparation method of buffering PSA adhesive film

Abstract

The invention relates to the technical field of pressure-sensitive adhesives, in particular to a buffer PSA adhesive film with columnar array air bags and a preparation method of the buffer PSA adhesive film. The array hole glue film comprises a planar release film, an array hole glue film, a PSA glue film and a planar release film which are sequentially arranged from top to bottom, and a plurality of columnar air bags which are distributed at equal intervals are uniformly formed in the array hole glue film. According to the invention, by optimizing and balancing the PSA formula and the design of the columnar air bag in the PSA formula, the optimal balance between the buffer performance and the surface flatness of the adhesive film is realized, so that the risk of appearance failure of evaluation water ripples, orange peels and the like caused by the uneven surface of the buffer adhesive film is avoided while the buffer performance is ensured.

Description

Technical Field

[0001] The invention relates to the technical field of pressure-sensitive adhesives, in particular to a buffering PSA adhesive film with columnar array airbags and a preparation method thereof. Background Art

[0002] OLED display screens, as a new type of display light-emitting screen technology that has emerged in recent years and has innovative significance, have become the mainstream solution for smartphone display screens. In addition to the organic light-emitting layer components in OLED screens, there are also buffer foams used to protect the organic light-emitting layer. The common design is to combine copper foil with foam and mesh on both sides to form a heat dissipation and protection support structure on the back of the OLED display module. This copper foil foam and mesh adhesive layer composite structure is generally called an SCF module. Compared with other ordinary buffer foams, the foam used in the SCF module has a thin thickness, low density, and requires extremely high energy impact absorption performance, and also has high requirements for the flatness and uniformity of the appearance.

[0003] In response to this application requirement, the current design solution is to achieve this through foaming cushioning foam. Typical suppliers include Japan's Iwatani and South Korea's Anyone. The existing foaming technology is mainly achieved by three foaming processes:

[0004] 1. Inflation foaming process. This foaming process is an industrially mature technology in the field of polyurethane foam products. Currently, Iwatani Foam is using this foaming technology.

[0005] 2. Chemical foaming process. The gas-filled foaming process is to add compounds that release gas when decomposed by heat into the foaming resin. Such compounds are mainly azo compounds and sulfonylhydrazide compounds. Such compounds will release gas (usually nitrogen) when exposed to high temperature. However, the source of bubbles in the chemical foaming process is the gas released by the decomposition of the compounds. The foaming process goes through the process of bubble nucleus formation, bubble coarsening and bubble aggregation. Additives such as foam stabilizers will also exist in its formula system.

[0006] 3. Microsphere foaming process is a relatively new foaming technology. This foaming method is to add foaming microspheres into the polymer resin and fully stir and disperse it. Then, after the solvent is dried in the subsequent oven and enters the high-temperature zone, the microspheres in the resin will be preheated and expanded. The thickness and density of the final foam are controlled by selecting different types of foaming agents and the amount added.

[0007] The above foaming process can solve the need for application buffering. However, due to the process properties of the foam foam itself, its foaming structure is randomly distributed, and the size of the foaming balloons is not uniform. This characteristic will cause the foam foam surface to have a rough structure with ups and downs. Poor flatness will affect the appearance of the OLED module display, and water ripple marks will appear. In severe cases, the display evaluation will have an orange peel appearance, resulting in the scrapping of the screen.

[0008] In order to solve the above problems, the present invention provides a buffer PSA film with columnar array airbags and a preparation method thereof. Summary of the invention

[0009] The object of the present invention is to provide a cushioning PSA film with columnar array airbags and a preparation method thereof to solve the problems raised in the above background technology.

[0010] In order to solve the above technical problems, the present invention provides the following technical solutions:.

[0011] A cushioning PSA adhesive film with columnar array airbags, comprising a planar release film, an array hole adhesive film, a PSA adhesive film and a planar release film arranged in sequence from top to bottom;

[0012] A number of equidistantly distributed columnar air bags are uniformly formed in the array hole film;

[0013] The airbag area ratio A / S of the columnar airbags distributed in the array hole film is 47-75%;

[0014] Wherein, S is the unit area of ​​the array hole film; A is the sum of the cross-sectional areas of the columnar airbags in the unit area of ​​the array hole film.

[0015] More optimally, the height of the columnar airbags is 30 to 160 μm; and the height ratio of the columnar airbags to the array hole film is 0.3 to 0.8:1.

[0016] More optimally, the thickness of the array hole film is 50-200 μm.

[0017] The present invention also provides a method for preparing a cushioning PSA film having a columnar array of airbags, which is used for any of the above-mentioned cushioning PSA films having a columnar array of airbags, and comprises the following steps:

[0018] S1: Take a certain amount of solvent-based polyacrylate pressure-sensitive adhesive and isocyanate curing agent, mix and disperse them evenly on the columnar array imprinting template, dry them at 110°C for 5 minutes, stick the release surface of the flat release film on the other side of the adhesive film, and peel off the array imprinting template to obtain an array hole adhesive film carried by the flat release film.

[0019] S2: Take a solvent-based polyacrylate pressure-sensitive adhesive and an isocyanate curing agent, mix and disperse them evenly, apply them on the release surface of the flat release film, and dry them at 110° C. for 5 minutes to obtain a PSA film carried by the flat release film.

[0020] S3: Laminating the above array hole film and the PSA film with their film surfaces facing each other to obtain a finished cushioning PSA film with columnar array airbags.

[0021] More optimally, by mass fraction, the total amount of solvent-based polyacrylate pressure-sensitive adhesive used is 100 parts, including 31 parts of polyacrylate pressure-sensitive adhesive and 69 parts of solvent; and 0.5 to 0.6 parts of isocyanate curing agent is used.

[0022] Preferably, the polyacrylate pressure-sensitive adhesive is prepared by the following steps:

[0023] Take 3 parts of methyl methacrylate, 84.5 parts of butyl acrylate, 10 parts of isooctyl acrylate, 1.5 parts of hydroxyethyl acrylate, 0.5 parts of hydroxybutyl acrylate, 0.5 parts of acrylamide, 200 parts of ethyl acetate and 40 parts of toluene by mass fraction, mix and stir evenly in a reaction kettle to obtain a monomer solution;

[0024] Then, in a reactor equipped with a stirring device, a thermometer and a condensing reflux device, the mixture was stirred and heated to 67°C to reach a stable reflux state, and then 0.1 parts of initiator benzoyl peroxide was added, and the temperature in the reactor was controlled within 67±2°C by an active temperature control device to react for 2 hours, and 0.06 parts of initiator benzoyl peroxide was added to continue the reaction for 3 hours, and the temperature was kept constant at 67±2°C during the reaction;

[0025] After the reaction is completed and the material is cooled, 10 parts of tackifying resin are added and 10 parts of ethyl acetate are added for dilution to obtain a polyacrylate pressure-sensitive adhesive.

[0026] Preferably, the polyacrylate pressure-sensitive adhesive is prepared by the following steps:

[0027] 90 parts of butyl acrylate, 7 parts of isooctyl acrylate, 1.5 parts of hydroxyethyl acrylate, 1.5 parts of acrylamide, 200 parts of ethyl acetate and 40 parts of toluene were mixed and stirred uniformly in a reaction kettle to obtain a monomer solution;

[0028] Then, in a reactor equipped with a stirring device, a thermometer and a condensing reflux device, the mixture was stirred and heated to 65°C to reach a stable reflux state, and then 0.1 parts of initiator benzoyl peroxide was added, and the temperature in the reactor was controlled within 65±2°C by an active temperature control device to react for 2 hours, and 0.06 parts of initiator benzoyl peroxide was added to continue the reaction for 6 hours, with a constant temperature of 65±2°C during the reaction;

[0029] After the reaction is completed and the material is cooled, 10 parts of tackifying resin are added and 10 parts of ethyl acetate are added for dilution to obtain a polyacrylate pressure-sensitive adhesive.

[0030] Preferably, the polyacrylate pressure-sensitive adhesive is prepared by the following steps:

[0031] Take 10 parts of methyl methacrylate, 77.5 parts of butyl acrylate, 10 parts of isooctyl acrylate, 1.5 parts of hydroxyethyl acrylate, 1 part of acrylic acid, 200 parts of ethyl acetate, and 40 parts of toluene by mass fraction, mix and stir evenly in a reaction kettle to obtain a monomer solution;

[0032] Then, in a reactor equipped with a stirring device, a thermometer and a condensing reflux device, the mixture was stirred and heated to 67°C to reach a stable reflux state, and then 0.1 parts of initiator benzoyl peroxide was added, and the temperature in the reactor was controlled within 67±2°C by an active temperature control device to react for 2 hours, and 0.06 parts of initiator benzoyl peroxide was added, and the reaction was continued for 3 hours, with a constant temperature of 67±2°C during the reaction;

[0033] After the reaction is completed and the material is cooled, 10 parts of tackifying resin are added and 10 parts of ethyl acetate are added for dilution to obtain a polyacrylate pressure-sensitive adhesive.

[0034] More preferably, the isocyanate curing agent model is German Bayer L-75.

[0035] Preferably, the tackifying resin is of the type Kraton TP7042 or Arakawa GA-90A.

[0036] Compared with the prior art, the beneficial effects achieved by the present invention are:

[0037] (1) In the present invention, the optimal balance between the cushioning performance and the surface flatness of the film is achieved by optimizing the balanced PSA formula and the internal cylindrical airbag design, thereby avoiding the risk of appearance failure such as water ripples and orange peel caused by the uneven surface of the cushioning film while ensuring the cushioning performance.

[0038] (2) In the present invention, an arrayed columnar array hole pressure-sensitive adhesive film is formed by patterned array engraving, and then a uniform array of airbags is constructed in the pressure-sensitive adhesive film by compounding with a planar pressure-sensitive adhesive film, thereby avoiding the risk of the randomness of the foaming process causing the surface of the cushioning material to become rough and deformed, thereby causing appearance failure.

[0039] (3) In the present invention, by optimizing the modulus design of the pressure-sensitive adhesive, as well as the area ratio of the columnar airbag array and the airbag / adhesive film height ratio, an optimized product design scheme with a balance between cushioning performance and appearance smoothness is obtained. Within the optimized design range, the cushioning performance and smoothness are both better than the existing foam performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0041] Figure 1 It is a structural diagram of a cushioning PSA film with columnar array airbags in the present invention;

[0042] Figure 2 This is a structural diagram of the array hole film of the present invention;

[0043] Figure 3 Schematic diagram of the columnar array imprint template used in the present invention.

[0044] Among them, 101 is a flat release film; 201 is an array hole film; 301 is a PSA film; and 501 is a columnar array imprinting template. DETAILED DESCRIPTION

[0045] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0046] The present invention prepares several embodiments and comparative examples for verifying the performance of a prepared buffer PSA film having columnar array airbags.

[0047] Examples 1 to 5

[0048] Preparation of polyacrylate pressure-sensitive adhesive:

[0049] Take 3 parts (mass parts, the same below) of methyl methacrylate, 84.5 parts of butyl acrylate, 10 parts of isooctyl acrylate, 1.5 parts of hydroxyethyl acrylate, 0.5 parts of hydroxybutyl acrylate, 0.5 parts of acrylamide, 200 parts of ethyl acetate, and 40 parts of toluene, weigh and mix them in a reactor and stir them evenly to obtain a monomer solution, and then stir and heat them to 67°C in a reactor equipped with a stirring device, a thermometer and a condensing reflux device to reach a stable reflux state, then add 0.1 parts of initiator benzoyl peroxide, control the temperature in the reactor within 67±2°C by an active temperature control device to react for 2 hours, add 0.06 parts of initiator benzoyl peroxide to continue the reaction for 3 hours, and keep the temperature constant at 67±2°C during the reaction. After the reaction is completed and the material is cooled, 10 parts of tackifying resin (Kraton TP7042) are added and 10 parts of ethyl acetate are added to dilute, and a polyacrylate pressure-sensitive adhesive is obtained.

[0050] Preparation of finished cushioning PSA film with columnar array airbags:

[0051] Take 100 parts of solvent-based polyacrylate pressure-sensitive adhesive, which contains 69 parts of solvent and 0.5 parts of isocyanate curing agent (Bayer L-75 from Germany); mix and disperse the above proportions and evenly apply them on the columnar array imprinting template 501, dry at 110°C for 5 minutes, adhere the release surface of the flat release film to the other side of the film, and peel off the array imprinting template 501 to obtain a PSA film with columnar array holes supported by the flat release film.

[0052] Take 100 parts of solvent-based polyacrylate pressure-sensitive adhesive, which contains 69 parts of solvent; 0.5 parts of isocyanate curing agent (Bayer L-75 from Germany); mix and disperse the above proportions evenly on the release surface of the flat release film, and dry at 110°C for 5 minutes to obtain a PSA film carried by the flat release film.

[0053] The array hole film carried by the flat release film and the PSA film carried by the flat release film are laminated face to face to obtain a non-foamed high-flatness buffer film with columnar array airbags.

[0054] In each embodiment, the airbag area ratio is different; for embodiment 1, there are divergent embodiments 1-1 and divergent embodiments 1-2, and their airbag heights, PSA thicknesses, and airbag / film height ratios are different; see Table 1 for details.

[0055] Embodiments 6 to 9

[0056] Preparation of polyacrylate pressure-sensitive adhesive:

[0057] Take 90 parts (mass parts, the same below) of butyl acrylate, 7 parts of isooctyl acrylate, 1.5 parts of hydroxyethyl acrylate, 1.5 parts of acrylamide, 200 parts of ethyl acetate, and 40 parts of toluene, weigh and mix them in a reactor, stir them evenly, and obtain a monomer solution. Then, in a reactor equipped with a stirring device, a thermometer, and a condensing reflux device, stir and heat to 65°C to reach a stable reflux state, then add 0.1 parts of initiator benzoyl peroxide, control the temperature in the reactor within 65±2°C by an active temperature control device, and react for 2 hours. Add 0.06 parts of initiator benzoyl peroxide and continue to react for 6 hours. During the reaction, the temperature is kept constant at 65±2°C. After the reaction is completed, the material is cooled, 10 parts of tackifying resin (Arakawa GA-90A) are added and diluted with 10 parts of ethyl acetate to obtain a polyacrylate pressure-sensitive adhesive.

[0058] Preparation of finished cushioning PSA film with columnar array airbags:

[0059] Take 100 parts of solvent-based polyacrylate pressure-sensitive adhesive, which contains 69 parts of solvent and 0.6 parts of isocyanate curing agent (Bayer L-75 from Germany); mix and disperse the above proportions and evenly apply them on the columnar array imprinting template 501, dry at 110°C for 5 minutes, adhere the release surface of the flat release film to the other side of the film, and peel off the array imprinting template 501 to obtain a PSA film with columnar array holes supported by the flat release film.

[0060] Take 100 parts of solvent-based polyacrylate pressure-sensitive adhesive, which contains 69 parts of solvent; 0.6 parts of isocyanate curing agent (Bayer L-75 from Germany); mix and disperse the above proportions evenly on the release surface of the flat release film, and dry at 110°C for 5 minutes to obtain a PSA film carried by the flat release film.

[0061] The array hole film carried by the flat release film and the PSA film carried by the flat release film are laminated face to face to obtain a non-foamed high-flatness buffer film with columnar array airbags.

[0062] In each embodiment, the airbag area ratio is different; for embodiment 7, there is a divergent embodiment, and its airbag height, PSA thickness, and airbag / film height ratio are different; see Table 1 for details.

[0063] Embodiments 10 to 12

[0064] Preparation of polyacrylate pressure-sensitive adhesive:

[0065] Take 10 parts (mass parts, the same below) of methyl methacrylate, 77.5 parts of butyl acrylate, 10 parts of isooctyl acrylate, 1.5 parts of hydroxyethyl acrylate, 1 part of acrylic acid, 200 parts of ethyl acetate, and 40 parts of toluene, weigh and mix in a reactor and stir evenly to obtain a monomer solution, then stir and heat to 67°C in a reactor equipped with a stirring device, a thermometer and a condensing reflux device to reach a stable reflux state, then add 0.1 parts of initiator benzoyl peroxide, control the temperature in the reactor within 67±2°C by an active temperature control device to react for 2 hours, add 0.06 parts of initiator benzoyl peroxide to continue the reaction for 3 hours, and keep the temperature at 67±2°C during the reaction. After the reaction is completed, the material is cooled, 10 parts of tackifying resin (Kraton TP7042) are added and 10 parts of ethyl acetate are added to dilute, and a polyacrylate pressure-sensitive adhesive is obtained.

[0066] Preparation of finished cushioning PSA film with columnar array airbags:

[0067] Take 100 parts of solvent-based polyacrylate pressure-sensitive adhesive, which contains 69 parts of solvent; 0.5 parts of isocyanate curing agent (Bayer L-75 from Germany); mix and disperse the above proportions and evenly apply them on the columnar array imprinting template, dry at 110°C for 5 minutes, adhere the release surface of the flat release film to the other side of the film, and remove the array imprinting template to obtain a PSA film with columnar array holes supported by the flat release film.

[0068] Take 100 parts of solvent-based polyacrylate pressure-sensitive adhesive, which contains 69 parts of solvent; 0.5 parts of isocyanate curing agent (Bayer L-75 from Germany); mix and disperse the above proportions evenly on the release surface of the flat release film, and dry at 110°C for 5 minutes to obtain a PSA film carried by the flat release film.

[0069] The array hole film carried by the flat release film and the PSA film carried by the flat release film are laminated face to face to obtain a non-foamed high-flatness buffer film with columnar array airbags.

[0070] In each embodiment, the airbag area ratio is different; for embodiments 9 and 10, there are divergent embodiments, and their airbag height, PSA thickness, and airbag / film height ratio are different; see Table 1 for details.

[0071] Comparative Example 0-1

[0072] Use Iwatani air-filled acrylic foam, thickness 100μm

[0073] Comparative Example 0-2

[0074] Use ANYONE microsphere acrylic foam, thickness 100μm

[0075] Comparative Example 1

[0076] The difference from Example 1 is that there is no cylindrical airbag design.

[0077] Comparative Example 2

[0078] The difference from Example 6 is that there is no cylindrical airbag design.

[0079] Comparative Example 3

[0080] The difference from Example 10 is that there is no cylindrical airbag design.

[0081] In the present invention, the buffering performance test of the obtained buffer film is a drop ball impact test, and the drop ball impact test simulates the actual SCF module structure in the following manner:

[0082] One side of the foam and film described in the comparative example and the embodiment is compounded with the adhesive surface of the single-sided copper foil pressure-sensitive adhesive, and the other side is compounded with the non-grid surface of the ultra-fine grid adhesive to form an SCF composite module. The grid surface of the ultra-fine grid adhesive is then compounded with pressure-sensitive paper (Fuji, MS series pressure-sensitive paper) to form an impact simulation test module. Take a 2g stainless steel ball and drop it naturally from a height of 100mm to impact the impact simulation test module from one side of the copper foil pressure-sensitive adhesive. The pressure-sensitive paper will undergo differential color change due to the difference in impact strength. Then, the color change difference of the pressure-sensitive adhesive is identified through a special transfer piece, and the impact strength is read in MPa.

[0083] The surface flatness test method is:

[0084] One side of the foam and film described in the comparative example and the embodiment is compounded with the adhesive surface of the copper foil single-sided pressure-sensitive adhesive, and the other side is compounded with the non-grid surface of the ultra-fine grid adhesive to form an SCF composite module. The grid surface of the ultra-fine grid adhesive is then compounded with 100 μm transparent PET to form a flatness test module sample.

[0085] Select a rectangular test light source, and observe the reflection of the light source on the PET surface at a distance of 50 to 60 cm under an illumination of 1100 lux.

[0086] In this case, ask any 100 people to visually judge that the edge of the reflection of the light source is clear, straight and without deformation. If 70 or more people observe and judge that the edge of the reflection of the light source is clear, straight and without deformation, it is marked as "○", if 30 or more people but less than 70 people observe and judge that the edge of the reflection of the light source is clear, straight and without deformation, it is marked as "△", and if less than 30 people observe and judge that the edge of the reflection of the light source is clear, straight and without deformation, it is marked as "×".

[0087] After testing the embodiments and comparative examples, the test results are shown in Table 1.

[0088] Table 1 Test results of various embodiments and comparative examples

[0089]

[0090]

[0091]

[0092] The comparative example used is a flat film without airbags. The flat film without airbags has a negative effect on the cushioning performance but a positive effect on the flatness performance.

[0093] It can be seen from Table 1 that in each embodiment and its deployment, the addition of the airbag has a positive gain on cushioning, and its effect is better than that of the comparative example.

[0094] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0095] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A cushioning PSA film with columnar array airbags, characterized in that: It comprises a planar release film (101), an array hole adhesive film (201), a PSA adhesive film (301) and a planar release film (101) which are arranged in sequence from top to bottom; A plurality of columnar air bags (601) are evenly formed in the array hole film (201) and are distributed at equal distances; The airbag area ratio A / S of the columnar airbags (601) distributed in the array hole film (201) is 47-75%; Wherein, S is the unit area of ​​the array hole film (201); and A is the sum of the cross-sectional areas of the columnar airbags (601) within the unit area of ​​the array hole film (201).

2. The cushioning PSA film with columnar array airbags according to claim 1, characterized in that: The height of the columnar airbag (601) is 30 to 160 μm; and the height ratio of the columnar airbag (601) to the array hole film (201) is 0.3 to 0.8:

1.

3. The cushioning PSA film with columnar array airbags according to claim 1, characterized in that: The thickness of the array hole film (201) is 50-200 μm.

4. A method for preparing a cushioning PSA film with columnar array airbags, used for preparing any one of the cushioning PSA films with columnar array airbags as claimed in claims 1 to 3, characterized in that: The steps include: S1: Take a certain amount of solvent-based polyacrylate pressure-sensitive adhesive and isocyanate curing agent, mix and disperse them evenly on the columnar array imprinting template, dry them at 110°C for 5 minutes, stick the release surface of the flat release film on the other side of the adhesive film, and peel off the array imprinting template to obtain an array hole adhesive film carried by the flat release film. S2: Take a solvent-based polyacrylate pressure-sensitive adhesive and an isocyanate curing agent, mix and disperse them evenly, apply them on the release surface of the flat release film, and dry them at 110° C. for 5 minutes to obtain a PSA film carried by the flat release film. S3: Laminating the above array hole film and the PSA film with their film surfaces facing each other to obtain a finished cushioning PSA film with columnar array airbags.

5. The method for preparing a cushioning PSA film having columnar array airbags according to claim 4, characterized in that: Calculated by mass fraction, the total amount of the solvent-based polyacrylate pressure-sensitive adhesive used is 100 parts, including 31 parts of polyacrylate pressure-sensitive adhesive and 69 parts of solvent; the amount of the isocyanate curing agent used is 0.5 to 0.6 parts.

6. The method for preparing a cushioning PSA film having columnar array airbags according to claim 5, characterized in that: The polyacrylate pressure-sensitive adhesive comprises the following steps during preparation: Take 3 parts of methyl methacrylate, 84.5 parts of butyl acrylate, 10 parts of isooctyl acrylate, 1.5 parts of hydroxyethyl acrylate, 0.5 parts of hydroxybutyl acrylate, 0.5 parts of acrylamide, 200 parts of ethyl acetate and 40 parts of toluene by mass fraction, mix and stir evenly in a reaction kettle to obtain a monomer solution; Then, in a reactor equipped with a stirring device, a thermometer and a condensing reflux device, the mixture was stirred and heated to 67°C to reach a stable reflux state, and then 0.1 parts of initiator benzoyl peroxide was added, and the temperature in the reactor was controlled within 67±2°C by an active temperature control device to react for 2 hours, and 0.06 parts of initiator benzoyl peroxide was added to continue the reaction for 3 hours, and the temperature was kept constant at 67±2°C during the reaction; After the reaction is completed and the material is cooled, 10 parts of tackifying resin are added and 10 parts of ethyl acetate are added for dilution to obtain a polyacrylate pressure-sensitive adhesive.

7. The method for preparing a cushioning PSA film having columnar array airbags according to claim 5, characterized in that: The polyacrylate pressure-sensitive adhesive comprises the following steps during preparation: 90 parts of butyl acrylate, 7 parts of isooctyl acrylate, 1.5 parts of hydroxyethyl acrylate, 1.5 parts of acrylamide, 200 parts of ethyl acetate and 40 parts of toluene were mixed and stirred uniformly in a reaction kettle to obtain a monomer solution; Then, in a reactor equipped with a stirring device, a thermometer and a condensing reflux device, the mixture was stirred and heated to 65°C to reach a stable reflux state, and then 0.1 parts of initiator benzoyl peroxide was added, and the temperature in the reactor was controlled within 65±2°C by an active temperature control device to react for 2 hours, and 0.06 parts of initiator benzoyl peroxide was added to continue the reaction for 6 hours, with a constant temperature of 65±2°C during the reaction; After the reaction is completed and the material is cooled, 10 parts of tackifying resin are added and 10 parts of ethyl acetate are added for dilution to obtain a polyacrylate pressure-sensitive adhesive.

8. The method for preparing a cushioning PSA film having columnar array airbags according to claim 5, characterized in that: The polyacrylate pressure-sensitive adhesive comprises the following steps during preparation: Take 10 parts of methyl methacrylate, 77.5 parts of butyl acrylate, 10 parts of isooctyl acrylate, 1.5 parts of hydroxyethyl acrylate, 1 part of acrylic acid, 200 parts of ethyl acetate, and 40 parts of toluene by mass fraction, mix and stir evenly in a reaction kettle to obtain a monomer solution; Then, in a reactor equipped with a stirring device, a thermometer and a condensing reflux device, the mixture was stirred and heated to 67°C to reach a stable reflux state, and then 0.1 parts of initiator benzoyl peroxide was added, and the temperature in the reactor was controlled within 67±2°C by an active temperature control device to react for 2 hours, and 0.06 parts of initiator benzoyl peroxide was added to continue the reaction for 3 hours, and the temperature was kept constant at 67±2°C during the reaction; After the reaction is completed and the material is cooled, 10 parts of tackifying resin are added and 10 parts of ethyl acetate are added for dilution to obtain a polyacrylate pressure-sensitive adhesive.

9. The method for preparing a cushioning PSA film having columnar array airbags according to claim 5, characterized in that: The isocyanate curing agent model is German Bayer L-75.

10. The method for preparing a cushioning PSA film having columnar array airbags according to claim 6, 7 or 8, characterized in that: The model of the tackifying resin is Kraton TP7042 or Arakawa GA-90A.

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