Pressure-sensitive adhesive for anti-static polaroid protective film and preparation method of pressure-sensitive adhesive

Abstract

The invention discloses a pressure-sensitive adhesive for an anti-static polaroid protective film and a preparation method thereof, and the pressure-sensitive adhesive is prepared from the following raw materials in parts by weight: 30-40 parts of a water-based acrylate pressure-sensitive adhesive, 10-20 parts of Arabic gum, 10-20 parts of carrageenan, 2-acrylic acid-hexahydro-4, 4, 6-trimethyl-1, 3-pentanediol monoisobutyrate, 1-3 parts of a surfactant, 1-3 parts of an anti-static agent, 1-3 parts of an anti The preparation method comprises the following steps: adding 1 to 3 parts of 2, 7-methylene-1H-indenyl ester, 1 to 3 parts of 5-vinyl bicyclo [2.2. 1] heptyl-2-ene, 1 to 3 parts of a rosinyl acrylamide monomer, 5 to 8 parts of 1-allyl-3-vinyl imidazole chlorine salt, 0.8 to 1.5 parts of a hyperbranched water-soluble conjugated polymer, 0.5 to 1.5 parts of N-(4-cyano-3-trifluoromethylphenyl) methacrylamide, 0.3 to 0.6 part of vinylethylene carbonate and 1 to 3 parts of N-acryloylmorpholine into a reaction kettle; 0.5 to 1.5 parts of an initiator and 15 to 25 parts of water. The pressure-sensitive adhesive has the advantages of good bonding performance, excellent antistatic performance, high temperature and high humidity resistance, good aging resistance and high light transmittance.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of adhesive products, in particular to a pressure-sensitive adhesive for anti-static polarizer protective film and a preparation method thereof. BACKGROUND

[0002] The full name of the polarizer is the polarized light sheet, which is an important component in liquid crystal display. Its function is to change the properties of light, convert natural light into polarized light, and increase the clarity of the display. In order to prevent the surface of the polarizer from being contaminated or damaged during the assembly step or the transportation process, a protective film needs to be attached to the surface of the polarizer. After the polarizer is assembled into the liquid crystal display, the protective film is peeled off from the surface of the polarizer. In the process of peeling off the protective film, static voltage is easily generated, which can damage the liquid crystal molecules and control circuit in the liquid crystal display. Therefore, the pressure-sensitive adhesive used for the polarizer protective film needs to have certain anti-static performance. In this situation, the anti-static polarizer protective film pressure-sensitive adhesive emerges as the times require, which has attracted widespread attention.

[0003] At present, the pressure-sensitive adhesive for anti-static polarizer protective film on the market has problems such as limited bonding performance, insufficient aging resistance, high temperature and humidity resistance, and anti-static performance needs to be further improved. For example, Chinese invention patent CN112708008B discloses an acrylic copolymer, a pressure-sensitive adhesive, a preparation method and application in a polarizer. The acrylic copolymer comprises the following components by mass percentage: 20-35% of soft monomer, 3-9% of hard monomer, 0.5-5% of functional monomer, 0.05-0.5% of free radical initiator, and 55-75% of solvent. The acrylic copolymer, the crosslinking agent, the silane coupling agent and the solvent are uniformly mixed, and then the pressure-sensitive adhesive coating liquid is obtained after standing and defoaming. Then the pressure-sensitive adhesive coating liquid is uniformly coated on the release film, and then the drying process and the curing process are carried out to obtain the pressure-sensitive adhesive. The acrylic pressure-sensitive adhesive has good bonding force for the polarizer, good aging resistance, high temperature and humidity resistance, high light transmittance, and the reaction process is mild and easy to control, and the volatile monomer residue is less. However, its anti-static performance still needs to be further improved.

[0004] In view of the above problems, there is an urgent need for an anti-static polarizer protective film pressure-sensitive adhesive with good bonding performance, excellent anti-static performance, good high temperature and humidity resistance, good aging resistance, and high light transmittance, and a preparation method thereof. SUMMARY

[0005] The main purpose of the present application is to provide an anti-static polarizer protective film pressure-sensitive adhesive with good bonding performance, excellent anti-static performance, good high temperature and humidity resistance, good aging resistance, and high light transmittance, and a preparation method thereof.

[0006] To achieve the above object, the present application provides a kind of antistatic polarizer protective film with pressure sensitive adhesive, including the following by weight parts of each raw material is made: water-based acrylic pressure sensitive adhesive 30-40 parts, gum arabic 10-20 parts, carrageenan 10-20 parts, 2-acrylic acid-hexahydro-4,7-methylene-1H-indenyl ester 1-3 parts, 5-vinyl bicyclo [2.2.1] hept-2-alkene 1-3 parts, rosin-based acrylamide monomer 1-3 parts, 1-allyl-3-vinylimidazole chloride salt 5-8 parts, hyperbranched water-soluble conjugated polymer 0.8-1.5 parts, N-(4-cyano-3-trifluoromethyl phenyl) methacrylamide 0.5-1.5 parts, ethylene carbonate 0.3-0.6 parts, N-acryloyl morpholine 1-3 parts, initiator 0.5-1.5 parts, water 15-25 parts.

[0007] Preferably, the water-based acrylic pressure sensitive adhesive is water-based acrylic pressure sensitive adhesive SA-227.

[0008] Preferably, the source of the rosin-based acrylamide monomer has no special requirements, and in an embodiment of the present application, the rosin-based acrylamide monomer is made according to the method of Example 1 in Chinese invention patent CN105348422B.

[0009] Preferably, the source of the hyperbranched water-soluble conjugated polymer has no special requirements, and in an embodiment of the present application, the hyperbranched water-soluble conjugated polymer is made according to the method of Example 1 in Chinese invention patent CN102660003B.

[0010] Preferably, the initiator is one or both of azobisisobutyronitrile and dibenzoyl peroxide.

[0011] Another object of the present application is to provide a preparation method of the antistatic polarizer protective film with pressure sensitive adhesive, comprising the following steps: mixing the raw materials of the antistatic polarizer protective film with pressure sensitive adhesive uniformly by weight parts, standing and defoaming to obtain a pressure sensitive adhesive coating solution, then uniformly coating the pressure sensitive adhesive coating solution on the surface of a PET film with a thickness of 40 μm, drying and then pasting a release film, and then performing a curing process to obtain the antistatic polarizer protective film with pressure sensitive adhesive.

[0012] Preferably, the thickness of the release film is 20-50 μm, and the release film is a PET release film.

[0013] Preferably, the drying temperature is 100-115°C, and the time is 1-3 min.

[0014] Preferably, the temperature of the curing process is 35-45°C, and the time is 20-40 h.

[0015] Due to the use of the above technical solution, the present application has the following beneficial effects: The pressure-sensitive adhesive for the anti-static polarizer protection film disclosed in the present application uses gum arabic and carrageenan as part of the components, reduces the use of petroleum-derived raw materials, and can protect the environment and reduce the use of petroleum resources.

[0016] The pressure-sensitive adhesive for the anti-static polarizer protection film disclosed in the present application comprises the following raw materials in parts by weight: water-based acrylate pressure-sensitive adhesive 30-40 parts, gum arabic 10-20 parts, carrageenan 10-20 parts, 2-acrylic acid-hexahydro-4,7-methylene-1H-indenyl ester 1-3 parts, 5-vinylbicyclo[2.2.1]hept-2-ene 1-3 parts, rosin-based acrylamide monomer 1-3 parts, 1-allyl-3-vinylimidazole chloride salt 5-8 parts, hyperbranched water-soluble conjugated polymer 0.8-1.5 parts, N-(4-cyano-3-trifluoromethylphenyl) methacrylamide 0.5-1.5 parts, ethylene carbonate 0.3-0.6 parts, N-acryloyl morpholine 1-3 parts, initiator 0.5-1.5 parts, and water 15-25 parts. Through the mutual cooperation of the raw materials, the pressure-sensitive adhesive for the anti-static polarizer protection film has good adhesion, excellent anti-static performance, good high temperature and humidity resistance, good aging resistance, and high light transmittance.

[0017] The pressure-sensitive adhesive for the anti-static polarizer protection film disclosed in the present application uses hyperbranched water-soluble conjugated polymer as the main antistatic active ingredient, which has good compatibility with other components and good dispersibility in water. The ionic groups on the hyperbranched water-soluble conjugated polymer and the imidazole salt groups on the 1-allyl-3-vinylimidazole chloride salt can ion exchange with the acid groups on the gum arabic and carrageenan to form an interpenetrating network structure, effectively improving the adhesion, anti-static performance, high temperature and humidity resistance, and aging resistance of the pressure-sensitive adhesive. The combination of hyperbranched water-soluble conjugated polymer, gum arabic, carrageenan, and 1-allyl-3-vinylimidazole chloride salt can ensure good anti-static performance of the product.

[0018] The pressure-sensitive adhesive for the anti-static polarizer protection film disclosed in the present application introduces ester groups, hydroxyl groups, hexahydro-4,7-methylene-1H-indenyl ester, bicyclo[2.2.1]hept-2-ene, amide, rosin, imidazole salt, cyano, trifluoromethylphenyl, carbonate, and acryl morpholine structures in the structure of the pressure-sensitive adhesive through the mutual cooperation of the raw materials. These structures can effectively improve the adhesion, high temperature and humidity resistance, and aging resistance of the pressure-sensitive adhesive under the multiple effects of electronic effect, steric effect, and conjugation effect. DETAILED DESCRIPTION

[0019] The following description is provided to enable any person skilled in the art to practice the application as claimed. The preferred embodiments described herein are only examples of the many embodiments of the application which have been contemplated. Other embodiments of the application will be readily apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. Example 1

[0020] A pressure sensitive adhesive for anti-static polarizer protection film, comprising the following raw materials made by weight parts: water-based acrylate pressure sensitive adhesive 30 parts, gum arabic 10 parts, carrageenan 10 parts, 2-acrylic acid-hexahydro-4,7-methylene-1H-indenyl ester 1 part, 5-vinyl bicyclo[2.2.1]hept-2-ene 1 part, rosin-based acrylamide monomer 1 part, 1-allyl-3-vinylimidazole chloride salt 5 parts, hyperbranched water-soluble conjugated polymer 0.8 parts, N-(4-cyano-3-trifluoromethyl phenyl) methacrylamide 0.5 parts, ethylene carbonate 0.3 parts, N-acryloyl morpholine 1 part, initiator 0.5 parts, water 15 parts.

[0021] The water-based acrylate pressure sensitive adhesive is water-based acrylate pressure sensitive adhesive SA-227; the rosin-based acrylamide monomer is made by the method of Example 1 in Chinese invention patent CN105348422B; the hyperbranched water-soluble conjugated polymer is made by the method of Example 1 in Chinese invention patent CN102660003B; and the initiator is azobis isobutyronitrile.

[0022] A preparation method of the pressure sensitive adhesive for anti-static polarizer protection film, comprising the following steps: mixing the raw materials of the pressure sensitive adhesive for anti-static polarizer protection film uniformly by weight parts, standing and defoaming to obtain a pressure sensitive adhesive coating liquid, then uniformly coating the pressure sensitive adhesive coating liquid on the surface of a PET film with a thickness of 40 μm, drying and then pasting a release film, and then performing a curing process to prepare the pressure sensitive adhesive for anti-static polarizer protection film; the thickness of the release film is 20 μm, and the release film is a PET release film; the drying temperature is 100°C, and the time is 1 min; and the temperature of the curing process is 35°C, and the time is 20 h. Example 2

[0023] A pressure sensitive adhesive for anti-static polarizer protection film, comprising the following raw materials made by weight parts: water-based acrylate pressure sensitive adhesive 33 parts, gum arabic 12 parts, carrageenan 13 parts, 2-acrylic acid-hexahydro-4,7-methylene-1H-indenyl ester 1.5 parts, 5-vinyl bicyclo[2.2.1]hept-2-ene 1.5 parts, rosin-based acrylamide monomer 1.5 parts, 1-allyl-3-vinylimidazole chloride salt 6 parts, hyperbranched water-soluble conjugated polymer 1 part, N-(4-cyano-3-trifluoromethyl phenyl) methacrylamide 0.9 parts, ethylene carbonate 0.4 parts, N-acryloyl morpholine 1.5 parts, initiator 0.8 parts, water 18 parts.

[0024] The water-based acrylate pressure-sensitive adhesive is water-based acrylate pressure-sensitive adhesive SA-227; the rosin-based acrylamide monomer is prepared according to the method in Example 1 of Chinese Invention Patent CN105348422B; the hyperbranched water-soluble conjugated polymer is prepared according to the method in Example 1 of Chinese Invention Patent CN102660003B; and the initiator is dibenzoyl peroxide.

[0025] A preparation method of the pressure-sensitive adhesive for the anti-static polarizer protective film, comprising the following steps: uniformly mixing each raw material of the pressure-sensitive adhesive for the anti-static polarizer protective film according to weight parts, standing and defoaming to obtain a pressure-sensitive adhesive coating liquid, then uniformly coating the pressure-sensitive adhesive coating liquid on the surface of a PET film with a thickness of 40 μm, laminating a release film after drying, and then performing a curing process to prepare the pressure-sensitive adhesive for the anti-static polarizer protective film; the thickness of the release film is 30 μm, and the release film is a PET release film; the drying temperature is 105 ℃, and the time is 1.5 min; and the temperature of the curing process is 38 ℃, and the time is 25 h. Example 3

[0026] A pressure-sensitive adhesive for an anti-static polarizer protective film, comprising the following raw materials prepared according to weight parts: water-based acrylate pressure-sensitive adhesive 35 parts, gum arabic 15 parts, carrageenan 15 parts, 2-propenoic acid-hexahydro-4,7-methylene-1H-indenyl ester 2 parts, 5-vinylbicyclo[2.2.1]hept-2-ene 2 parts, rosin-based acrylamide monomer 2 parts, 1-allyl-3-vinylimidazole chloride salt 6.5 parts, hyperbranched water-soluble conjugated polymer 1.2 parts, N-(4-cyano-3-trifluoromethylphenyl) methacrylamide 1 part, vinylidene carbonate 0.45 parts, N-acryloyl morpholine 2 parts, initiator 1 part, and water 20 parts.

[0027] The water-based acrylate pressure-sensitive adhesive is water-based acrylate pressure-sensitive adhesive SA-227; the rosin-based acrylamide monomer is prepared according to the method in Example 1 of Chinese Invention Patent CN105348422B; the hyperbranched water-soluble conjugated polymer is prepared according to the method in Example 1 of Chinese Invention Patent CN102660003B; and the initiator is azobisisobutyronitrile.

[0028] A preparation method of the pressure-sensitive adhesive for the anti-static polarizer protective film, comprising the following steps: uniformly mixing each raw material of the pressure-sensitive adhesive for the anti-static polarizer protective film according to weight parts, standing and defoaming to obtain a pressure-sensitive adhesive coating liquid, then uniformly coating the pressure-sensitive adhesive coating liquid on the surface of a PET film with a thickness of 40 μm, laminating a release film after drying, and then performing a curing process to prepare the pressure-sensitive adhesive for the anti-static polarizer protective film; the thickness of the release film is 30 μm, and the release film is a PET release film; the drying temperature is 105 ℃, and the time is 1.5 min; and the temperature of the curing process is 38 ℃, and the time is 25 h. Example 4

[0029] A pressure-sensitive adhesive for anti-static polarizer protection film, comprising the following raw materials made by weight parts: water-based acrylate pressure-sensitive adhesive 38 parts, gum arabic 18 parts, carrageenan 18 parts, 2-acrylic acid-hexahydro-4,7-methylene-1H-indenyl ester 2.5 parts, 5-vinylbicyclo[2.2.1]hept-2-ene 2.5 parts, rosin-based acrylamide monomer 2.5 parts, 1-allyl-3-vinylimidazole chloride salt 7.5 parts, hyperbranched water-soluble conjugated polymer 1.3 parts, N-(4-cyano-3-trifluoromethylphenyl) methacrylamide 1.3 parts, ethylene carbonate 0.55 parts, N-acryloyl morpholine 2.5 parts, initiator 1.3 parts, water 23 parts.

[0030] The water-based acrylate pressure-sensitive adhesive is water-based acrylate pressure-sensitive adhesive SA-227; the rosin-based acrylamide monomer is made according to the method of Example 1 in Chinese invention patent CN105348422B; the hyperbranched water-soluble conjugated polymer is made according to the method of Example 1 in Chinese invention patent CN102660003B; the initiator is a mixture of azobisisobutyronitrile and dibenzoyl peroxide with a mass ratio of 3:5.

[0031] A preparation method of the pressure-sensitive adhesive for anti-static polarizer protection film, comprising the following steps: mixing the raw materials of the pressure-sensitive adhesive for anti-static polarizer protection film uniformly by weight parts, standing and defoaming to obtain a pressure-sensitive adhesive coating liquid, then uniformly coating the pressure-sensitive adhesive coating liquid on the surface of a PET film with a thickness of 40 μm, drying and then pasting a release film, and then performing a curing process to prepare the pressure-sensitive adhesive for anti-static polarizer protection film; the thickness of the release film is 35 μm, which is a PET release film; the drying temperature is 113°C, and the time is 2.5 min; the temperature of the curing process is 43°C, and the time is 35 h. Example 5

[0032] A pressure-sensitive adhesive for anti-static polarizer protection film, comprising the following raw materials made by weight parts: water-based acrylate pressure-sensitive adhesive 40 parts, gum arabic 20 parts, carrageenan 20 parts, 2-acrylic acid-hexahydro-4,7-methylene-1H-indenyl ester 3 parts, 5-vinylbicyclo[2.2.1]hept-2-ene 3 parts, rosin-based acrylamide monomer 3 parts, 1-allyl-3-vinylimidazole chloride salt 8 parts, hyperbranched water-soluble conjugated polymer 1.5 parts, N-(4-cyano-3-trifluoromethylphenyl) methacrylamide 1.5 parts, ethylene carbonate 0.6 parts, N-acryloyl morpholine 3 parts, initiator 1.5 parts, water 25 parts.

[0033] The water-based acrylate pressure-sensitive adhesive is water-based acrylate pressure-sensitive adhesive SA-227; the rosin-based acrylamide monomer is prepared according to the method in Example 1 of Chinese Invention Patent CN105348422B; the hyperbranched water-soluble conjugated polymer is prepared according to the method in Example 1 of Chinese Invention Patent CN102660003B; and the initiator is azobisisobutyronitrile.

[0034] A preparation method of the anti-static polarizer protective film pressure-sensitive adhesive comprises the following steps: mixing each raw material of the anti-static polarizer protective film pressure-sensitive adhesive according to weight parts, uniformly standing and defoaming to obtain a pressure-sensitive adhesive coating liquid, then uniformly coating the pressure-sensitive adhesive coating liquid on the surface of a PET film with a thickness of 40 μm, drying and then pasting a release film, and then performing a curing process to prepare the anti-static polarizer protective film pressure-sensitive adhesive; the release film has a thickness of 50 μm and is a PET release film; the drying temperature is 115 ℃, and the time is 3 min; and the curing process temperature is 45 ℃, and the time is 40 h.

[0035] Comparative Example 1 The present application provides an anti-static polarizer protective film pressure-sensitive adhesive, which has a similar formula and preparation method to Example 1, except that the components gum karaya and N-(4-cyano-3-trifluoromethylphenyl) methacrylamide are not included.

[0036] Comparative Example 2 The present application provides an anti-static polarizer protective film pressure-sensitive adhesive, which has a similar formula and preparation method to Example 1, except that the components gum arabic and 1-allyl-3-vinylimidazole chloride salt are not included.

[0037] In order to further illustrate the unexpected beneficial technical effects of the anti-static polarizer protective film pressure-sensitive adhesive involved in the embodiments of the present application, the anti-static polarizer protective film pressure-sensitive adhesive prepared in each of Examples 1-5 and Comparative Examples 1-2 is subjected to relevant performance tests, and the test results are shown in Table 1. The dry adhesive thickness of each pressure-sensitive adhesive is controlled to be 10 μm during the preparation process of the test sample. The test method is as follows: (1) Light transmittance: according to standard GB / T2410-2008, using a haze meter (model: U3000), tearing off the release film, and measuring the light transmittance.

[0038] (2) Peeling force test: the pressure-sensitive adhesive is cut into a size of 300×25 mm, the release film is torn off, the pressure-sensitive adhesive is pasted on the surface of the polarizer, and an electronic universal testing machine (model: AGS-X) is used to perform a peeling test under the conditions of an angle of 180 。 , a tensile speed of 300 mm / min.

[0039] (3) Test of the resistance of the adhesive layer: cut the pressure sensitive adhesive into 12*12mm size, tear off the release film, and test the resistance of the adhesive layer on a high resistance meter (model: SME-8310).

[0040] (4) High temperature and high humidity test: cut the pressure sensitive adhesive into 150*25mm size, tear off the release film, and adhere the pressure sensitive adhesive to the surface of the polarizer, and then put it into a programmable constant temperature and humidity test chamber, and after 85℃, 90%RH*500h, observe whether there is wrinkle, separation or bubble on the surface of the polarizer, if not, it is judged as OK, if yes, it is judged as NG.

[0041] As shown in Table 1, the pressure sensitive adhesive for the anti-static polarizer protective film prepared in the embodiment of the present application has better adhesive property, high temperature and high humidity resistance, and anti-static property, and has good light transmittance, and the addition of the carrageenan, N-(4-cyano-3-trifluoromethylphenyl) methacrylamide, gum arabic and 1-allyl-3-vinylimidazole chloride is beneficial to improving the above properties.

[0042]

[0043] The basic principles, main features and advantages of the present application are shown and described above. It should be understood by those skilled in the art that the present application is not limited by the above examples, and the above examples and descriptions in the specification are only the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A pressure-sensitive adhesive for antistatic polarizing film protection, characterized in that, It is made from the following raw materials in parts by weight: 30-40 parts of water-based acrylic pressure-sensitive adhesive, 10-20 parts of gum arabic, 10-20 parts of carrageenan, 1-3 parts of 2-acrylic acid-hexahydro-4,7-methylene-1H-indenyl ester, 1-3 parts of 5-vinylbicyclo[2.2.1]hept-2-ene, 1-3 parts of rosin-based acrylamide monomer, 5-8 parts of 1-allyl-3-vinylimidazolium chloride, 0.8-1.5 parts of hyperbranched water-soluble conjugated polymer, 0.5-1.5 parts of N-(4-cyano-3-trifluoromethylphenyl)methacrylamide, 0.3-0.6 parts of ethylene carbonate, 1-3 parts of N-acryloylmorpholine, 0.5-1.5 parts of initiator, and 15-25 parts of water.

2. The pressure-sensitive adhesive for antistatic polarizing film protection film according to claim 1, characterized in that, The water-based acrylic pressure-sensitive adhesive is water-based acrylic pressure-sensitive adhesive SA-227.

3. The pressure-sensitive adhesive for antistatic polarizing film protection film according to claim 1, characterized in that, The initiator is one or both of azobisisobutyronitrile and benzoyl peroxide.

4. A method for preparing a pressure-sensitive adhesive for an antistatic polarizing film according to any one of claims 1-3, characterized in that, The process includes the following steps: mixing the raw materials of the pressure-sensitive adhesive for antistatic polarizing film according to the weight parts, letting it stand to defoam, and obtaining the pressure-sensitive adhesive coating liquid. Then, the pressure-sensitive adhesive coating liquid is evenly coated on the surface of a PET film with a thickness of 40μm. After drying, a release film is laminated, and then a curing process is carried out to obtain the pressure-sensitive adhesive for antistatic polarizing film.

5. The method for preparing the pressure-sensitive adhesive for the antistatic polarizer protective film according to claim 4, characterized in that, The release film has a thickness of 20-50 μm and is a PET release film.

6. The method for preparing the pressure-sensitive adhesive for the antistatic polarizer protective film according to claim 4, characterized in that, The drying temperature is 100-115℃, and the time is 1-3 minutes.

7. The method for preparing the pressure-sensitive adhesive for the antistatic polarizer protective film according to claim 4, characterized in that, The curing process is carried out at a temperature of 35-45℃ for 20-40 hours.

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