PC optical adhesive

Abstract

The invention discloses a PC optical adhesive for bonding, wherein the acrylic optical adhesive is composed of the following components in parts by weight: 30-40 parts of butyl acrylate, 12-16 parts of methyl methacrylate, 4-8 parts of vinyl pyrrolidone, 18-25 parts of hydroxyethyl acrylate, 25-35 parts of 2-methoxyethyl acrylate, 0.4-0.8 parts of azobisisobutyronitrile, 1-3 parts of dimethylaminoethyl acrylate, 0.2-0.4 parts of 2-ethylanthraquinone, 100 parts of solvent, and 10-20 parts of diluent solvent. The PC optical adhesive for bonding of the invention ensures light transmittance, and there are still no bubbles when bonding with PC at a high temperature of 100°C and high humidity, so that the optical adhesive is not easily deformed under high temperature and high humidity conditions, thereby improving stability and reliability.

Description

Technical Field

[0001] The invention relates to the technical field of optical adhesives, and in particular to an acrylic optical adhesive. Background Art

[0002] "Mobile phone explosion-proof film" can effectively prevent the glass cover from breaking and splashing under external impact to a certain extent, reduce the invisible damage caused by damage to the glass panel, and ensure user safety. This requires our adhesive to be able to fit the PC substrate to a good degree. Since mobile phones are used frequently and in a more diverse environment, our adhesive is required to have a strong peeling force. Since the PC substrate is at high temperature, CO2 gas is easily released from the surface. This also requires the adhesive to have a higher modulus, and it is not easy to deform, bubble and other problems under high temperature and high humidity. Therefore, the main problem that this adhesive has to overcome is to fit PC without bubbling at high temperature, and it is also a new adhesive specially developed for this type of PC product. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide an optical adhesive for bonding PC. The acrylic optical adhesive ensures light transmittance and has no bubbles when bonded to PC at a high temperature of 100°C and high humidity, thereby making it difficult for the optical adhesive to deform under high temperature and high humidity conditions, thereby improving stability and reliability.

[0004] To achieve the above object, the technical solution adopted by the present invention is: a PC optical adhesive, wherein the acrylic optical adhesive is composed of the following components in parts by weight:

[0005] 30-40 parts of butyl acrylate,

[0006] 12 to 16 parts of methyl methacrylate,

[0007] 4 to 8 parts of vinyl pyrrolidone,

[0008] 18-25 parts of hydroxyethyl acrylate,

[0009] 25-35 parts of 2-methoxyethyl acrylate,

[0010] 0.4~0.8 parts of azobisisobutyronitrile,

[0011] 1-3 parts of dimethylaminoethyl acrylate,

[0012] 0.2-0.4 parts of 2-ethylanthraquinone,

[0013] 100 parts of solvent,

[0014] Dilute with 10~20 parts of solvent.

[0015] The technical solution further improved in the above technical solution is as follows:

[0016] 1. In the above scheme, the solvent is at least one of ethyl acetate, toluene and butanone.

[0017] 2. In the above scheme, the azobisisobutyronitrile is added to the acrylic optical adhesive at least twice.

[0018] 3. In the above scheme, the dilution solvent is ethyl acetate or acetone.

[0019] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art:

[0020] The PC optical adhesive for bonding the optical adhesive of the present invention is based on 30-40 parts of butyl acrylate, 4-8 parts of vinyl pyrrolidone, and 25-35 parts of 2-methoxyethyl acrylate, and further added with 1-3 parts of dimethylaminoethyl acrylate and 0.2-0.4 parts of 2-ethylanthraquinone. While ensuring the light transmittance, there are still no bubbles when bonding with PC at a high temperature of 100° C. and high humidity, so that the optical adhesive is not easy to deform under high temperature and high humidity conditions, and the stability and reliability are improved. DETAILED DESCRIPTION

[0021] The present invention can be further understood through the specific embodiments given below, but they are not intended to limit the present invention.

[0022] The present invention will be further described below in conjunction with embodiments:

[0023] Embodiments 1 to 4: A PC optical adhesive for bonding, wherein the acrylic optical adhesive is composed of the following components in parts by weight, as described in Table 1:

[0024] Table 1

[0025] Components Example 1 Example 2 Example 3 Example 4 Butyl acrylate 32 servings 38 servings 30 servings 38 servings Methyl Methacrylate 15 servings 12 servings 15 servings 12 servings Vinyl pyrrolidone 5 servings 4 servings 8 servings 5 servings Hydroxyethyl acrylate 20 servings 24 servings 20 servings 24 servings 2-Methoxyethyl acrylate 30 servings 28 servings 30 servings 32 servings Azobisisobutyronitrile 0.5 serving 0.4 parts 0.6 parts 0.5 serving Dimethylaminoethyl acrylate 1.5 servings 1.8 servings 2 servings 1.5 servings 2-Ethylanthraquinone 0.3 parts 0.25 0.3 parts 0.2 parts Solvents 100 copies 100 copies 100 copies 100 copies Dilution solvent 15 servings 12 servings 15 servings 12 servings

[0026] In Example 1, the solvent is ethyl acetate, azobisisobutyronitrile is added to the acrylic optical adhesive in three portions, and the dilution solvent is ethyl acetate.

[0027] In Example 2, the solvent is butanone, azobisisobutyronitrile is added to the acrylic optical adhesive at least three times, and the diluting solvent is ethyl acetate.

[0028] In Example 3, the solvent is ethyl acetate, azobisisobutyronitrile is added to the acrylic optical adhesive in three portions, and the dilution solvent is ethyl acetate.

[0029] In Example 4, the solvent is butanone, azobisisobutyronitrile is added to the acrylic optical adhesive in three portions, and the dilution solvent is acetone.

[0030] A preparation process for the above-mentioned PC optical adhesive comprises the following steps:

[0031] Step 1: Add 30-40 parts of butyl acrylate, 12-16 parts of methyl methacrylate, 4-8 parts of vinyl pyrrolidone, 18-25 parts of hydroxyethyl acrylate, 25-35 parts of 2-methoxyethyl acrylate, 0.1 parts of azobisisobutyronitrile, 1-3 parts of dimethylaminoethyl acrylate, 0.2-0.4 parts of 2-ethylanthraquinone, and 100 parts of solvent into a reactor, and stir at 65°C under nitrogen to maintain the reaction temperature for 3 hours;

[0032] Step 2: Add 0.2 parts of azobisisobutyronitrile and maintain the reaction temperature at 73°C for 2 hours;

[0033] Step 3, adding the remaining azobisisobutyronitrile, maintaining the reaction temperature at 78°C for 3 hours;

[0034] Step 4: cooling and adding 10 to 20 parts of diluent to obtain the acrylic optical adhesive.

[0035] Comparative Examples 1-3: A PC optical adhesive, wherein the acrylic optical adhesive is composed of the following components in parts by weight, as described in Table 2:

[0036] Table 2

[0037] Components Comparative Example 1 Comparative Example 2 Comparative Example 3 Butyl acrylate 32 servings 38 servings 32 servings Methyl Methacrylate 15 servings 12 servings 15 servings Vinyl pyrrolidone 5 servings 4 servings 5 servings Hydroxyethyl acrylate 20 servings 24 servings 20 servings 2-Methoxyethyl acrylate 30 servings 28 servings 30 servings Azobisisobutyronitrile 0.5 serving 0.4 parts 0.5 serving Dimethylaminoethyl acrylate - - 1.5 servings 2-Ethylanthraquinone 0.3 parts - - Solvents 100 copies 100 copies 100 copies Dilution solvent 15 servings 12 servings 15 servings

[0038] In Comparative Example 1, the solvent is ethyl acetate, azobisisobutyronitrile is added to the acrylic optical adhesive three times, and the dilution solvent is ethyl acetate.

[0039] In Comparative Example 2, the solvent is butanone, azobisisobutyronitrile is added to the acrylic optical adhesive at least three times, and the diluting solvent is ethyl acetate.

[0040] In Comparative Example 3, the solvent is ethyl acetate, azobisisobutyronitrile is added to the acrylic optical adhesive in three portions, and the dilution solvent is ethyl acetate.

[0041] The preparation method of the comparative example is the same as that of the example.

[0042] The PC optical adhesives obtained in Examples 1-4 and Comparative Examples 1-3 were mixed with the required isocyanate curing agent (Bayer L75), coated on 75um heavy release films, with a thickness of 50μm, baked at 120°C for 2min, and then laminated with 50μm release films.

[0043] After 72 hours at 45℃, place it in an environment of 23±1℃ and 50±5% humidity for 1 hour to test the peeling force, light transmittance and whether there are bubbles in the laminated PC at 100℃. The corresponding performance is shown in Table 3:

[0044] Table 3

[0045] Test items Example 1 Example 2 Example 3 Example 4 Comparative Example 1 Comparative Example 2 Comparative Example 3 Transmittance / % 92.3 92.4 92.1 92.5 92.1 92.3 92 Is there any bubble at 100℃? none none none none Small amount Small amount Small amount ;

[0047] As shown in the evaluation results of Table 3, the PC optical adhesives of Examples 1 to 4 of the present invention are less likely to generate bubbles when bonded to PC substrates compared to the comparative example.

[0048] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with the technology to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A PC acrylic optical adhesive, characterized in that: The acrylic optical adhesive is composed of the following components in parts by weight: 30-40 parts of butyl acrylate, 12 to 16 parts of methyl methacrylate, 4 to 8 parts of vinyl pyrrolidone, 18-25 parts of hydroxyethyl acrylate, 25-35 parts of 2-methoxyethyl acrylate, 0.4~0.8 parts of azobisisobutyronitrile, 1-3 parts of dimethylaminoethyl acrylate, 0.2-0.4 parts of 2-ethylanthraquinone, 100 parts of solvent, 10~20 parts of dilution solvent; The solvent is at least one of toluene and butanone; The dilution solvent is ethyl acetate or acetone.

2. The PC acrylic optical adhesive according to claim 1, characterized in that: The azobisisobutyronitrile is added to the acrylic optical adhesive at least twice.