Vehicle-mounted OCA optical adhesive and preparation method thereof

Abstract

The invention discloses a preparation method of a vehicle-mounted OCA optical adhesive, and belongs to the technical field of optical adhesive materials. The vehicle-mounted OCA optical adhesive comprises an optical light release film, an acrylic adhesive layer and an optical heavy release film which are sequentially arranged from top to bottom, the preparation method comprises the following steps: mixing and stirring an acrylic pressure-sensitive adhesive, 2-ethylhexyl acrylate, isobornyl acrylate, acryloylmorpholine, dodecyl ester, N-vinyl pyrrolidone, a bridging agent and a photoinitiator, filtering, and defoaming to obtain an acrylic adhesive; and coating a release film with the obtained acrylic adhesive, and irradiating the release film with a halogen lamp to obtain the vehicle-mounted OCA optical cement. The vehicle-mounted OCA optical adhesive prepared by the invention has better high-temperature-resistant and high-temperature-resistant and high-humidity-resistant effects, is simple in preparation process and is suitable for large-scale production.

Description

Technical Field

[0001] The invention belongs to the technical field of optical adhesive materials, and in particular relates to a method for preparing a vehicle-mounted OCA optical adhesive. Background Art

[0002] OCA optical adhesive is an optically transparent special double-sided adhesive without a substrate. It is used to bond transparent optical components. It is colorless and transparent, has a light transmittance of more than 90%, good bonding strength, can be cured at room temperature or medium temperature, and has small curing shrinkage. It is one of the important raw materials for touch screens and is also widely used in the automotive field, especially for bonding vehicle-mounted display screens.

[0003] With the rapid development of the automotive industry, the requirements for OCA optical adhesives are getting higher and higher; the current mainstream car panels generally use polymer plastic panels such as polymethyl methacrylate (PMMA), polycarbonate (PC) and cycloolefin polymer (COP) and other materials, but due to the special nature of their materials, they will produce outgassing under high temperature conditions, resulting in bubbles between the OCA optical adhesive and the display panel module. At the same time, under high temperature and high humidity conditions, moisture from the outside can penetrate from the edge of the display panel, causing turbidity inside the display panel. Conventional OCA optical adhesives are difficult to solve problems such as bubbles and turbidity in touch panels. In addition, due to the long service life of automobiles and long-term exposure to outdoor environments, they require better heat resistance, high temperature and high humidity resistance, and UV resistance than conventional touch panels.

[0004] The patent application with publication number CN 118978880 A discloses a high-temperature resistant vehicle-mounted OCA optical adhesive and a preparation method thereof, comprising the following steps: firstly dissolving the modified polyester in ethyl acetate to obtain a mixed solution, then adding the mixed solution to the polyacrylate, and finally adding a heat stabilizer, a synergist, a cross-linking agent, a coupling agent, and a photoinitiator, stirring and mixing evenly to obtain the OCA optical adhesive, which has good high-temperature resistance, but combined with the existing technology, it still cannot simultaneously meet the requirements of heat resistance, high-temperature and high-humidity resistance, and UV resistance; and the vehicle-mounted OCA adhesive has relatively weak UV resistance. Long-term exposure to ultraviolet rays will cause aging and performance degradation of the adhesive, as well as yellowing resulting in unclear display, which will affect the visual effect and display quality of the vehicle-mounted display. Summary of the invention

[0005] The object of the present invention is to provide a vehicle-mounted OCA optical adhesive and a preparation method thereof, so as to improve the high temperature and high humidity resistance of the vehicle-mounted OCA optical adhesive.

[0006] The purpose of the present invention can be achieved through the following technical solutions:

[0007] An in-vehicle OCA optical adhesive comprises, arranged in order from top to bottom: an optical light release film, an acrylic adhesive layer and an optical heavy release film;

[0008] The acrylic adhesive layer comprises acrylic pressure-sensitive adhesive, isooctyl acrylate, isobornyl acrylate, acryloyl morpholine, dodecyl ester, N-vinyl pyrrolidone, a bridging agent and a photoinitiator.

[0009] Furthermore, the bridging agent model is bridging agent EM2217.

[0010] Furthermore, the photoinitiator model is 184 photoinitiator.

[0011] Furthermore, the optical light release film has a thickness of 50-150 μm and a release force of 5-10 gf / in.

[0012] Furthermore, the optical heavy release film has a thickness of 50-150 μm and a release force of 20-40 f / in.

[0013] Furthermore, the thickness of the OCA optical adhesive layer is 200-500 μm.

[0014] Furthermore, the usage ratio of the acrylic pressure-sensitive adhesive, isooctyl acrylate, isobornyl acrylate, acryloylmorpholine, dodecyl ester, N-vinyl pyrrolidone, bridging agent and photoinitiator is (80-95): (2-8): (0.5-3): (0.5-2): (1.5-6): (0.5-2): (0.01-0.1): (0.01-0.5).

[0015] Among them, acrylic pressure-sensitive adhesive is a widely used pressure-sensitive adhesive, which is copolymerized by the main monomer, the second monomer and the functional group monomer. The main monomer makes the pressure-sensitive adhesive pressure-sensitive, which is the acrylic acid with a low glass transition temperature (Tg) of the polymer. The second monomer gives the pressure-sensitive adhesive cohesion. The homopolymers of these monomers often have a higher Tg. The functional group monomer can make the pressure-sensitive adhesive produce a certain degree of cross-linking, improving its bonding performance.

[0016] A method for preparing a vehicle-mounted OCA optical adhesive comprises the following steps:

[0017] Acrylic pressure-sensitive adhesive, isooctyl acrylate, isobornyl acrylate, acryloyl morpholine, dodecyl ester, N-vinyl pyrrolidone, a bridging agent and a photoinitiator are mixed and stirred, filtered, and degassed to obtain an acrylic adhesive; then the obtained acrylic adhesive is coated on a release film and irradiated with a halogen lamp to obtain a vehicle-mounted OCA optical adhesive.

[0018] Furthermore, the stirring condition is: stirring at 70-80° C. for 1-2 h.

[0019] Furthermore, the total energy of the halogen lamp is controlled at 1000 mJ / cm 2 Up to 3000mJ / cm 2 .

[0020] The OCA optical glue in the existing technology becomes soft at a high temperature of 95°C (the high-temperature aging temperature of automotive enterprises), and the adhesion between OCA and the adhered object will drop rapidly (drop by 50%-70%. For example, the basic adhesion of automotive OCA in the existing market will drop to <10N at a high temperature of 20N), which makes bubbles prone to appear. The new formula has been improved to enhance the adhesion, and the degree of adhesion drop is low at high temperatures.

[0021] Beneficial effects of the present invention:

[0022] (1) The present invention provides an on-vehicle OCA optical adhesive and a preparation method thereof, which improves the tolerance of the on-vehicle OCA optical adhesive in high temperature and high temperature and high humidity environments, thereby avoiding the generation of bubbles between the OCA optical adhesive and the on-vehicle display panel under high temperature and high temperature and high humidity, and the turbidity of the panel caused by moisture entering the edge; and the acrylic adhesive layer contains a special functional monomer acrylamide morpholine, which can effectively improve the anti-ultraviolet ability of the OCA optical adhesive and prevent the degradation of the OCA adhesive performance caused by aging under long-term ultraviolet irradiation.

[0023] (2) The new formula provided by the present invention adjusts the original glue and adds the monomer N-vinyl pyrrolidone to improve the bonding performance; adds the monomers isobornyl acrylate and N-vinyl pyrrolidone: these two monomers will increase the modulus of the colloid, that is, the colloid will not become too soft at high temperature, and the addition of dodecyl ester increases the creep performance of the colloid, which can be targeted at different adhered objects, and some rough adhered objects can be better filled. The functional monomer acryloylmorpholine is added to increase the UV resistance of OCA, which can effectively improve the acrylic glue under long-term ultraviolet irradiation. The colloid performance will decrease. In addition, the mixture of isobornyl acrylate and dodecyl ester can ensure that its creep is increased while the modulus performance remains unchanged.

[0024] (3) The preparation method of the vehicle-mounted OCA optical adhesive provided by the present invention has a simple preparation process; the prepared vehicle-mounted OCA optical adhesive is non-irritating and non-toxic to human skin and is suitable for large-scale production. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The present invention will be further described below in conjunction with the accompanying drawings.

[0026] Figure 1 It is a schematic structural diagram of the vehicle-mounted OCA optical adhesive of the present invention. DETAILED DESCRIPTION

[0027] The following will be combined with 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.

[0028] Example 1

[0029] 90 parts of acrylic pressure-sensitive adhesive, 6 parts of isooctyl acrylate, 2 parts of isobornyl acrylate, 1 part of acryloyl morpholine, 4 parts of dodecyl ester, 1 part of N-vinyl pyrrolidone, 0.05 parts of bridging agent EM2217 and 0.3 parts of 184 photoinitiator were stirred at 70°C for 1-2 hours, filtered and degassed to obtain an acrylic adhesive; the obtained acrylic adhesive was then coated on an optical release film to form an optical light release film, an acrylic adhesive layer and an optical heavy release film from top to bottom (the optical light release film had a thickness of 100 μm and a release force of 10 gf / in; the optical heavy release film had a thickness of 100 μm and a release force of 40 f / in); the film was irradiated with a halogen lamp (the total energy of the halogen lamp was 2000 mJ / cm 2 . ) to obtain 400μm vehicle-mounted OCA optical adhesive.

[0030] The above-mentioned vehicle-mounted OCA optical adhesive structure is as follows Figure 1 shown.

[0031] Example 2

[0032] Compared with Example 1, this embodiment differs in that the raw material ratio is different, and the specific implementation steps are as follows:

[0033] 95 parts of acrylic pressure-sensitive adhesive, 3 parts of isooctyl acrylate, 1 part of isobornyl acrylate, 1 part of acryloyl morpholine, 2 parts of dodecyl ester, 1 part of N-vinyl pyrrolidone, 0.001 parts of bridging agent EM2217 and 0.1 parts of 184 photoinitiator were stirred at 70°C for 1-2 hours, filtered and degassed to obtain an acrylic adhesive; the obtained acrylic adhesive was then coated on an optical release film to form an optical light release film, an acrylic adhesive layer and an optical heavy release film from top to bottom (the optical light release film had a thickness of 100 μm and a release force of 10 gf / in; the optical heavy release film had a thickness of 100 μm and a release force of 40 f / in); the film was irradiated with a halogen lamp (the total energy of the halogen lamp was 2000 mJ / cm 2 . ) to obtain 400μm vehicle-mounted OCA optical adhesive.

[0034] The above-mentioned vehicle-mounted OCA optical adhesive structure is as follows Figure 1 shown.

[0035] Example 3

[0036] Compared with Example 1, this embodiment differs in that the raw material ratio is different, and the specific implementation steps are as follows:

[0037] 80 parts of acrylic pressure-sensitive adhesive, 8 parts of isooctyl acrylate, 3 parts of isobornyl acrylate, 2 parts of acryloyl morpholine, 6 parts of dodecyl ester, 2 parts of N-vinyl pyrrolidone, 0.1 parts of bridging agent EM2217 and 0.5 parts of 184 photoinitiator were stirred at 70°C for 1-2 hours, filtered and degassed to obtain an acrylic adhesive; then the obtained acrylic adhesive was coated on an optical release film to form an optical light release film, an acrylic adhesive layer and an optical heavy release film from top to bottom (the optical light release film had a thickness of 100 μm and a release force of 10 gf / in; the optical heavy release film had a thickness of 100 μm and a release force of 40 f / in); irradiated with a halogen lamp (the total energy of the halogen lamp was 2000 mJ / cm 2 . ) to obtain 400μm vehicle-mounted OCA optical adhesive.

[0038] The above-mentioned vehicle-mounted OCA optical adhesive structure is as follows Figure 1 shown.

[0039] Example 4

[0040] Compared with Example 1, the difference between this embodiment and Example 1 lies in the difference in the optical release film, and the thickness of the vehicle-mounted OCA optical adhesive remains unchanged. The specific implementation steps are as follows:

[0041] 90 parts of acrylic pressure-sensitive adhesive, 6 parts of isooctyl acrylate, 2 parts of isobornyl acrylate, 1 part of acryloyl morpholine, 4 parts of dodecyl ester, 1 part of N-vinyl pyrrolidone, 0.05 parts of bridging agent EM2217 and 0.3 parts of 184 photoinitiator were stirred at 70°C for 1-2h, filtered and degassed to obtain an acrylic adhesive; then the obtained acrylic adhesive was coated on an optical release film to form an optical light release film, an acrylic adhesive layer and an optical heavy release film from top to bottom (the optical light release film had a thickness of 50 μm and a release force of 5 gf / in; the optical heavy release film had a thickness of 50 μm and a release force of 20 f / in); irradiated with a halogen lamp (the total energy of the halogen lamp was 2000 mJ / cm 2 . ) to obtain 400μm vehicle-mounted OCA optical adhesive.

[0042] The above-mentioned vehicle-mounted OCA optical adhesive structure is as follows Figure 1 shown.

[0043] Example 5

[0044] Compared with Example 1, the difference between this embodiment and Example 1 lies in the difference in the optical release film, and the thickness of the vehicle-mounted OCA optical adhesive changes accordingly. The specific implementation steps are as follows:

[0045] 90 parts of acrylic pressure-sensitive adhesive, 6 parts of isooctyl acrylate, 2 parts of isobornyl acrylate, 1 part of acryloyl morpholine, 4 parts of dodecyl ester, 1 part of N-vinyl pyrrolidone, 0.05 parts of bridging agent EM2217 and 0.3 parts of 184 photoinitiator were stirred at 70°C for 1-2h, filtered and degassed, and then the obtained acrylic adhesive was coated on the optical release film to form an optical light release film, an acrylic adhesive layer and an optical heavy release film from top to bottom (the thickness of the optical light release film is 50μm, and the release force is 5gf / in; the thickness of the optical heavy release film is 50μm, and the release force is 20f / in); irradiated with a halogen lamp (the total energy of the halogen lamp is 2000mJ / cm 2 . ) to obtain 300μm vehicle-mounted OCA optical adhesive.

[0046] The above-mentioned vehicle-mounted OCA optical adhesive structure is as follows Figure 1 shown.

[0047] Example 6

[0048] Compared with Example 1, the difference between this embodiment and Example 1 lies in the difference in the optical release film, and the thickness of the vehicle-mounted OCA optical adhesive remains unchanged. The specific implementation steps are as follows:

[0049] 90 parts of acrylic pressure-sensitive adhesive, 6 parts of isooctyl acrylate, 2 parts of isobornyl acrylate, 1 part of acryloyl morpholine, 4 parts of dodecyl ester, 1 part of N-vinyl pyrrolidone, 0.05 parts of bridging agent EM2217 and 0.3 parts of 184 photoinitiator were stirred at 70°C for 1-2h, filtered and degassed, and then the obtained acrylic adhesive was coated on the optical release film to form an optical light release film, an acrylic adhesive layer and an optical heavy release film from top to bottom (the thickness of the optical light release film is 150μm, and the release force is 10gf / in; the thickness of the optical heavy release film is 150μm, and the release force is 40f / in); irradiated with a halogen lamp (the total energy of the halogen lamp is 2000mJ / cm 2 . ) to obtain 400μm vehicle-mounted OCA optical adhesive.

[0050] The above-mentioned vehicle-mounted OCA optical adhesive structure is as follows Figure 1 shown.

[0051] Comparative Example 1

[0052] Compared with Example 1, this comparative example does not add a bridging agent, and the specific implementation steps are as follows:

[0053] 90 parts of acrylic pressure-sensitive adhesive, 6 parts of isooctyl acrylate, 2 parts of isobornyl acrylate, 1 part of acryloyl morpholine, 4 parts of dodecyl ester, 1 part of N-vinyl pyrrolidone and 0.3 parts of 184 photoinitiator were stirred at 70°C for 1-2 hours, filtered and degassed to obtain an acrylic adhesive; the obtained acrylic adhesive was then coated on an optical release film to form an optical light release film, an acrylic adhesive layer and an optical heavy release film from top to bottom (the optical light release film had a thickness of 100 μm and a release force of 10 gf / in; the optical heavy release film had a thickness of 100 μm and a release force of 40 f / in); the film was irradiated with a halogen lamp (the total energy of the halogen lamp was 2000 mJ / cm 2 . ) to obtain 400μm vehicle-mounted OCA optical adhesive.

[0054] The above-mentioned vehicle-mounted OCA optical adhesive structure is as follows Figure 1 shown.

[0055] Comparative Example 2

[0056] Compared with Example 1, this comparative example does not add isobornyl acrylate, and the specific implementation steps are as follows:

[0057] 92 parts of acrylic pressure-sensitive adhesive, 6 parts of isooctyl acrylate, 1 part of acryloyl morpholine, 4 parts of dodecyl ester, 1 part of N-vinyl pyrrolidone, 0.05 parts of bridging agent EM2217 and 0.3 parts of 184 photoinitiator were stirred at 70°C for 1-2 hours, filtered and degassed to obtain an acrylic adhesive; the obtained acrylic adhesive was then coated on an optical release film to form an optical light release film, an acrylic adhesive layer and an optical heavy release film from top to bottom (the optical light release film had a thickness of 100 μm and a release force of 10 gf / in; the optical heavy release film had a thickness of 100 μm and a release force of 40 f / in); the film was irradiated with a halogen lamp (the total energy of the halogen lamp was 2000 mJ / cm 2 . ) to obtain 400μm vehicle-mounted OCA optical adhesive.

[0058] The above-mentioned vehicle-mounted OCA optical adhesive structure is as follows Figure 1 shown.

[0059] Comparative Example 3

[0060] Compared with Example 1, this comparative example does not add dodecyl ester, and the specific implementation steps are as follows:

[0061] 94 parts of acrylic pressure-sensitive adhesive, 6 parts of isooctyl acrylate, 2 parts of isobornyl acrylate, 1 part of acryloyl morpholine, 1 part of N-vinyl pyrrolidone, 0.05 parts of bridging agent EM2217 and 0.3 parts of 184 photoinitiator were stirred at 70°C for 1-2 hours, filtered and degassed to obtain an acrylic adhesive; the obtained acrylic adhesive was then coated on an optical release film to form an optical light release film, an acrylic adhesive layer and an optical heavy release film from top to bottom (the optical light release film had a thickness of 100 μm and a release force of 10 gf / in; the optical heavy release film had a thickness of 100 μm and a release force of 40 f / in); the film was irradiated with a halogen lamp (the total energy of the halogen lamp was 2000 mJ / cm 2 . ) to obtain 400μm vehicle-mounted OCA optical adhesive.

[0062] The above-mentioned vehicle-mounted OCA optical adhesive structure is as follows Figure 1 shown.

[0063] Comparative Example 4

[0064] Compared with Example 1, this comparative example differs in that isobornyl acrylate and dodecyl acrylate are not added at the same time, and the specific implementation steps are as follows:

[0065] 95 parts of acrylic pressure-sensitive adhesive, 6 parts of isooctyl acrylate, 1 part of acryloyl morpholine, 1 part of N-vinyl pyrrolidone, 0.05 parts of bridging agent EM2217 and 0.3 parts of 184 photoinitiator were stirred at 70°C for 1-2 hours, filtered and degassed to obtain an acrylic adhesive; the obtained acrylic adhesive was then coated on an optical release film to form an optical light release film, an acrylic adhesive layer and an optical heavy release film from top to bottom (the optical light release film had a thickness of 100 μm and a release force of 10 gf / in; the optical heavy release film had a thickness of 100 μm and a release force of 40 f / in); the film was irradiated with a halogen lamp (the total energy of the halogen lamp was 2000 mJ / cm 2 . ) to obtain 400μm vehicle-mounted OCA optical adhesive.

[0066] The above-mentioned vehicle-mounted OCA optical adhesive structure is as follows Figure 1 shown.

[0067] The performance of the vehicle-mounted OCA optical adhesives prepared in Examples 1 to 6 and Comparative Examples 1 to 4 was tested:

[0068] 1. Test the bonding performance of vehicle-mounted OCA optical adhesive at room temperature;

[0069] 2. Test the adhesion of the vehicle-mounted OCA optical adhesive at 95°C;

[0070] 3. Put the OCA glue and OCA on the adhered object into 95℃ high temperature, 85℃ high temperature 85% humidity, Q-Sun, -40℃~85℃ hot and cold cycle, -40℃ equipment, and age for 2000h (stand for 2h after aging and test it at room temperature), and test the bonding performance of the vehicle-mounted OCA optical glue.

[0071] The results are shown in Table 1:

[0072] Table 1

[0073] project Adhesion force(N) Adhesion strength at 95℃(N) Adhesion strength after aging (N) Example 1 32 23 32 Example 2 31 22 31 Example 3 31 22 30 Example 4 30 20 30 Example 5 30 19 29 Example 6 28 18 26 Comparative Example 1 22 11 11 Comparative Example 2 21 10 20 Comparative Example 3 20 10 20 Comparative Example 4 18 9 17

[0074] It can be seen from Table 1 that the difference between Examples 2 to 3 and Example 1 is only the change in the raw material ratio within a reasonable range. From the results, the prepared automotive OCA optical adhesives all have good adhesion and good high temperature and humidity resistance. The difference between Examples 4 to 6 and Example 1 is the effect of the thickness change of the optical film and the acrylic adhesive layer on the performance of the automotive OCA optical adhesive. The results show that the thickness of the optical film and the acrylic adhesive layer used in Example 1 have the best effect.

[0075] Compared with Example 1, the difference between Comparative Example 1 is whether a bridging agent is added. Since the cross-linking bridging effect of the bridging agent can make the raw material components combine more evenly, the results of Comparative Example 1 show that the bonding performance is reduced; compared with Example 1, the difference between Comparative Examples 2 to 4 is whether isobornyl acrylate and dodecyl ester are added to the acrylic adhesive. The results show that the bonding force is greatly reduced, indicating that the high temperature and high humidity resistance of the automotive OCA optical adhesive is reduced. This is because the mixture of isobornyl acrylate and dodecyl ester can ensure that the modulus performance remains unchanged while increasing its creep, thereby improving the performance of the optical adhesive.

[0076] In summary, the OCA optical adhesive provided by the present invention has a high degree of curing and good high temperature resistance and high temperature and high humidity resistance effects, a simple preparation process, and is suitable for large-scale production.

[0077] 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.

[0078] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A vehicle-mounted OCA optical adhesive, characterized in that: It includes: an optical light release film, an acrylic adhesive layer and an optical heavy release film arranged in sequence from top to bottom; The acrylic adhesive layer comprises acrylic pressure-sensitive adhesive, isooctyl acrylate, isobornyl acrylate, acryloyl morpholine, dodecyl ester, N-vinyl pyrrolidone, a bridging agent and a photoinitiator.

2. The vehicle-mounted OCA optical adhesive according to claim 1, characterized in that: The model of the bridging agent is bridging agent EM2217.

3. The vehicle-mounted OCA optical adhesive according to claim 1, characterized in that: The photoinitiator model is 184 photoinitiator.

4. The vehicle-mounted OCA optical adhesive according to claim 1, characterized in that: The optical light release film has a thickness of 50-150 μm and a release force of 5-10 gf / in.

5. The vehicle-mounted OCA optical adhesive according to claim 1, characterized in that: The optical heavy release film has a thickness of 50-150 μm and a release force of 20-40 f / in.

6. The vehicle-mounted OCA optical adhesive according to claim 1, characterized in that: The thickness of the OCA optical adhesive layer is 200-500 μm.

7. The vehicle-mounted OCA optical adhesive according to claim 1, characterized in that: The usage ratio of the acrylic pressure-sensitive adhesive, isooctyl acrylate, isobornyl acrylate, acryloyl morpholine, dodecyl ester, N-vinyl pyrrolidone, bridging agent and photoinitiator is (80-95): (2-8): (0.5-3): (0.5-2): (1.5-6): (0.5-2): (0.01-0.1): (0.01-0.5).

8. A method for preparing a vehicle-mounted OCA optical adhesive according to any one of claims 1 to 7, characterized in that: The steps include: Acrylic pressure-sensitive adhesive, isooctyl acrylate, isobornyl acrylate, acryloyl morpholine, dodecyl ester, N-vinyl pyrrolidone, a bridging agent and a photoinitiator are mixed and stirred, filtered, and degassed to obtain an acrylic adhesive; then the obtained acrylic adhesive is coated on a release film and irradiated with a halogen lamp to obtain a vehicle-mounted OCA optical adhesive.

9. The method for preparing a vehicle-mounted OCA optical adhesive according to claim 8, characterized in that: The stirring condition is: stirring at 70-80° C. for 1-2 h.

10. The method for preparing a vehicle-mounted OCA optical adhesive according to claim 8, characterized in that: The total energy of the halogen lamp is controlled at 1000mJ / cm 2 Up to 3000mJ / cm 2 .

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