Antistatic UV viscosity-reducing glue, UV viscosity-reducing film and preparation method

Abstract

The invention provides an antistatic UV viscosity-reducing glue, a UV viscosity-reducing film and a preparation method, the antistatic UV viscosity-reducing glue comprises the following raw materials by weight: 40-50 parts of a main glue solution, 15-20 parts of a urethane acrylate solution, 25-60 parts of an organic solvent, and 0.5-5 parts of a photoinitiator, the main glue solution is obtained by solution polymerization of a soft monomer, a hard monomer, a functional monomer and an unsaturated quaternary ammonium salt monomer under the action of an initiator, the mass ratio of the soft monomer to the hard monomer to the functional monomer to the unsaturated quaternary ammonium salt monomer to the initiator is (50-80): (10-15): (2-10): (0.5-3): (0.1-1), and the weight-average molecular weight of the main glue is 450,000-650,000. The unsaturated quaternary ammonium salt monomer with an antistatic effect is introduced into the main glue in a copolymerization manner, so that the antistatic UV viscosity-reducing glue taking the main glue as a main component has relatively low surface resistance and excellent stripping performance.

Description

Technical Field

[0001] The invention belongs to the technical field of UV adhesives, and in particular relates to an antistatic UV viscosity-reducing adhesive, a UV viscosity-reducing film and a preparation method thereof. Background Art

[0002] UV adhesive thinning adhesive refers to the adhesive layer that is reduced in its original bonding strength by ultraviolet light irradiation, thereby achieving the effect of being easily peeled off after the temporary protection function is realized. This is exactly the opposite of the purpose of conventional UV adhesive to achieve higher bonding strength through light curing. It belongs to a very special type of UV adhesive, which is commonly used for wafer cutting, such as: in the manufacturing process of chips, it is attached to the back of the wafer for protection, fixation and support to prevent the wafer from moving, dislocating or fragments from splashing. After the processing is completed, the adhesive thinning adhesive can be instantly de-sticky by UV light, so that the product can be easily removed from the film.

[0003] Researchers have done a lot of research on UV viscosity-reducing adhesives, such as patent CN111171751B discloses a UV viscosity-reducing film and its preparation method, patent CN114085312B discloses a high-temperature resistant UV self-viscosity-reducing acrylic resin additive, acrylic resin containing it, and high-temperature resistant UV viscosity-reducing film.

[0004] The above UV anti-viscosity film has sufficient adhesive force to fix the wafer during processing. After processing, UV light greatly reduces the peeling force and loses the stickiness, which is conducive to the pickup of the device. However, the substrate of the UV anti-viscosity protective film is prone to generate static electricity due to friction during use, and its use in the field of electronic parts with high static requirements is limited. For example, it is easy to absorb dust and then transfer it to the surface of the attached product, or the static voltage is too high, resulting in defective parts, etc. Therefore, it is necessary to develop a UV anti-viscosity adhesive composition with good antistatic properties. Summary of the invention

[0005] To solve the above problems, the present invention provides an antistatic UV viscosity-reducing adhesive, a UV viscosity-reducing film and a preparation method, by introducing an unsaturated quaternary ammonium salt monomer with antistatic effect into the main adhesive in a copolymerization manner, so that the antistatic UV viscosity-reducing adhesive with the main adhesive as the main component can have both low surface resistance and excellent peeling performance.

[0006] In order to achieve the above purpose, the following technical solutions are adopted:

[0007] An antistatic UV viscosity-reducing adhesive comprises the following raw materials in parts by weight: 40-50 parts of a main adhesive solution, 15-20 parts of a polyurethane acrylate solution, 25-60 parts of an organic solvent, and 0.5-5 parts of a photoinitiator. The main adhesive solution is obtained by solution polymerization of a soft monomer, a hard monomer, a functional monomer, and an unsaturated quaternary ammonium salt monomer under the action of an initiator. The mass ratio of the soft monomer, the hard monomer, the functional monomer, the unsaturated quaternary ammonium salt monomer, and the initiator is 50-80:10-15:2-10:0.5-3:0.1-1. The weight average molecular weight of the main adhesive is 450,000-650,000.

[0008] The raw materials of the main adhesive solution include soft monomer, hard monomer, functional monomer, unsaturated quaternary ammonium salt monomer and initiator. The proportion of unsaturated quaternary ammonium salt monomer is critical. Too much or too little is not suitable. If the amount of unsaturated quaternary ammonium salt monomer in the mass ratio is less than 0.5, the antistatic UV viscosity-reducing adhesive cannot play an antistatic effect, and the surface resistance value exceeds 10 13 Ω, if the amount of unsaturated quaternary ammonium salt monomer in the mass ratio is greater than 3, the moisture absorption capacity of the antistatic UV detackifying adhesive is significantly improved, which will seriously affect the time stability of the peeling force of the antistatic UV detackifying adhesive.

[0009] Furthermore, the mass ratio of the soft monomer, the hard monomer, the functional monomer, the unsaturated quaternary ammonium salt monomer and the initiator is 70-75:10-15:5-7:2-2.5:0.5-1, and the weight average molecular weight of the main rubber is 450,000-550,000.

[0010] The unsaturated quaternary ammonium salt monomer is selected from one or a combination of two or more of acryloyloxyethyl trimethyl ammonium chloride, methacryloyloxyethyl trimethyl ammonium chloride, allyl trimethyl ammonium chloride and acryloyloxyethyl trimethyl ammonium chloride.

[0011] Furthermore, the unsaturated quaternary ammonium salt monomer is methacryloyloxyethyl trimethylammonium chloride.

[0012] The soft monomer is selected from one or a combination of two or more of ethyl acrylate, isooctyl acrylate and dodecyl methacrylate.

[0013] The hard monomer is selected from one or a combination of two or more of methyl acrylate, methyl methacrylate, ethyl methacrylate, n-butyl methacrylate, and vinyl acetate.

[0014] The functional monomer is selected from one or a combination of two or more of acrylic acid, methacrylic acid, hydroxyethyl acrylate, hydroxypropyl acrylate, hydroxyethyl methacrylate, hydroxypropyl methacrylate, and diethylene glycol monoacrylate.

[0015] Furthermore, the functional monomer is a compound of hydroxyethyl acrylate and acrylic acid in a mass ratio of 3-4:3-4.

[0016] The solid content of the main glue solution is 48-52wt%.

[0017] The molecular chains formed by solution polymerization of the above-mentioned soft monomers, hard monomers, functional monomers, and unsaturated quaternary ammonium salt monomers are relatively flexible, have strong wetting ability, strong interfacial adhesion, and strong peel strength. The formation of initial adhesion requires that the adhesive and the surface of the adherend have good wettability. After the two interfaces are in good contact, the interface adhesion is given, and the expected physical parameters are obtained. The UV viscosity-reducing adhesive with excellent pressure sensitivity and antistatic properties is obtained.

[0018] The initiator is selected from one or a combination of two or more of azobisisobutyronitrile, azobisisoheptanenitrile and dibenzoyl peroxide.

[0019] Furthermore, the initiator is azobisisobutyronitrile.

[0020] The main glue solution is prepared by a method comprising the following steps:

[0021] 1) Under an inert atmosphere, add the soft monomer, the hard monomer, the functional monomer, the first initiator, and the solvent into a reaction kettle with a reflux device, mix them evenly, and heat them to react;

[0022] 2) adding a mixture of an unsaturated quaternary ammonium salt monomer, a second initiator and a solvent to the mixed system after the reaction in step 1) is completed, and continuing the reaction at a constant temperature after the addition is completed;

[0023] 3) adding the third initiator solution dropwise to the mixed system after the reaction in step 2), continuing the reaction at a constant temperature after the addition, and cooling naturally to room temperature after the reaction to obtain a main glue solution.

[0024] The mass ratio of the soft monomer, hard monomer, functional monomer, unsaturated quaternary ammonium salt monomer to the solvent in step 1) is 0.8-1.3:1, the first initiator is the same as the above-mentioned initiator, the amount of the first initiator in step 1) accounts for 1 / 3-2 / 3 of the total mass of the initiator required for the preparation of the main glue solution, preferably 1 / 2, and the solvent is selected from one or a combination of two or more of ethyl acetate, butyl acetate, and toluene. The heating is raised to 78-85°C, and the heating reaction is heated to the reflux timer of the condenser for 1-3h.

[0025] The step 2) is performed by dripping with a peristaltic pump for 1-1.5 hours, and the constant temperature reaction time is 0.5-1.5 hours; the second initiator is the same as the above-mentioned initiator, and the amount of the second initiator accounts for 1 / 5-1 / 3, preferably 1 / 4 of the total mass of the initiator required for the preparation of the main glue solution, and the initiator accounts for 1-2wt% in the mixture, and the solvent is the same as the solvent in step 1).

[0026] The third initiator in step 3) is the same as the above-mentioned initiator, and the amount of the third initiator is 1 / 5-1 / 3, preferably 1 / 4 of the total mass of the initiator required for the preparation of the main glue solution. The concentration of the initiator solution is 1-2wt%, and the solvent of the initiator solution is the same as the solvent in step 1). The dripping is done by a peristaltic pump, and the dripping is completed in 20-45 minutes. The constant temperature reaction time is 0.5-1.5h.

[0027] The solid content of the polyurethane acrylate solution is 75-85wt%, and the functionality of the polyurethane acrylate in the polyurethane acrylate solution is 5-7.

[0028] Furthermore, the polyurethane acrylate solution is selected from one or a combination of two or more of DIC-V-4025 and DIC-17-806.

[0029] Furthermore, the polyurethane acrylate solution is DIC-V-4025.

[0030] The organic solvent is selected from one or a combination of two or more of ethyl acetate, toluene and acetone.

[0031] The photoinitiator is selected from one or a combination of two or more of α-hydroxyketone derivatives, α-aminoketone derivatives, acetophenone derivatives, benzoin and derivatives thereof.

[0032] The present invention also provides a method for preparing an antistatic UV viscosity-reducing adhesive, comprising the following steps:

[0033] Under light-proof conditions, the main adhesive solution and the organic solvent are mixed evenly, the polyurethane acrylate solution and the photoinitiator are added, and the mixture is mixed evenly again, allowed to stand, and defoamed to obtain an antistatic UV viscosity-reducing adhesive.

[0034] A UV anti-viscosity film comprises a release film, an antistatic UV anti-viscosity adhesive, a primer and a substrate which are arranged in sequence.

[0035] The primer is prepared by mixing antistatic coating liquid, water, cyclohexanone and ethanol in a mass ratio of 1.0-2.5:1.0-2:0.5-1:0.03-0.05.

[0036] The antistatic coating liquid includes poly (3,4-ethylenedioxythiophene), sodium polystyrene sulfonate, and water. Preferably, the mass ratio of poly (3,4-ethylenedioxythiophene), sodium polystyrene sulfonate, and water is 1:1-3:250-270. More preferably, the mass ratio of poly (3,4-ethylenedioxythiophene), sodium polystyrene sulfonate, and water is 1:2-3:260-270. The most preferred antistatic coating liquid is AntiStat FA-2000.

[0037] By adjusting the mass ratio of antistatic coating liquid, water, cyclohexanone and ethanol, the antistatic coating coated on the surface of the substrate can form a uniform and dense conductive film, which interacts with the chain segments formed by the unsaturated quaternary ammonium salt monomers in the antistatic UV viscosity-reducing adhesive to form a conductive path inside the UV viscosity-reducing film. The synergistic effect of the two helps to improve the antistatic effect of the UV viscosity-reducing film.

[0038] The thickness of the antistatic UV viscosity-reducing adhesive and the primer after drying is 20 μm-30 μm and 0.3-0.8 μm respectively.

[0039] The release film is a PET release film with a thickness of 30-70 μm.

[0040] The substrate is selected from PO film, PVC film or a combination of the two, and the thickness of the substrate is 70-80 μm.

[0041] The present invention also provides a method for preparing a UV anti-viscosity film, comprising the following steps:

[0042] S1: evenly mix the antistatic coating liquid, water, cyclohexanone and ethanol, and then apply the mixture on the substrate;

[0043] S2, in the dark, apply the antistatic UV viscosity-reducing adhesive on the release film and dry it;

[0044] S3: compounding the product of step S1 and the product of step S2 under light-proof conditions, and aging them to obtain the above-mentioned UV viscosity-reducing film.

[0045] The drying in step S2 is performed at 100-105° C. for 1-3 minutes. The aging in step S3 is performed at 25-60° C. for 2-7 days.

[0046] Compared with the prior art, the present invention has the following beneficial effects:

[0047] 1. The present invention introduces unsaturated quaternary ammonium salt monomers with antistatic effect into the main adhesive by copolymerization, so that the antistatic UV viscosity-reducing adhesive with the main adhesive as the main component can have both low surface resistance and excellent peeling performance.

[0048] 2. The inventors found that dissolving and diluting the antistatic coating liquid AntiStat FA-2000 with water, cyclohexanone and ethanol can synergistically improve the tearing voltage and antistatic performance of the UV anti-viscosity film. DETAILED DESCRIPTION

[0049] The present invention will be further described below in conjunction with specific embodiments, but is not limited to the contents of the specification. Unless otherwise specified, the "parts" described in the embodiments of the present invention are all parts by weight. The reagents used are all commercially available reagents in the art.

[0050] Polyurethane acrylate DIC-V-4025, with a functionality of 5, was purchased from Guangzhou Cobalt Trading Co., Ltd.

[0051] AntiStat FA-2000 was purchased from Nantong Leishang Chemical Co., Ltd.

[0052] The PVC film had a thickness of 70 μm and was purchased from Nitto Denko Corporation.

[0053] The PO film was 80 μm thick and was purchased from Toray Industries, Ltd., Japan.

[0054] The PET film was 50 μm thick and was purchased from Toray Industries, Ltd.

[0055] Preparation of antistatic UV viscosity reducing adhesive

[0056] Preparation Example 1

[0057] 1) Under nitrogen atmosphere, add 75 parts of isooctyl acrylate, 15 parts of methyl methacrylate, 4 parts of hydroxyethyl acrylate, 3 parts of acrylic acid, 0.25 parts of AIBN, and 100 parts of ethyl acetate into a reaction kettle with a reflux device and mix well, heat to 80°C, and continue the reaction for 3 hours when reflux appears on the condenser;

[0058] 2) adding a mixture of 2.5 parts of methacryloyloxyethyl trimethylammonium chloride, 0.125 parts of AIBN and 3.625 parts of ethyl acetate to the mixture after the reaction in step 1) using a peristaltic pump, the dripping is completed for 1.5 hours, and then the reaction is continued at a constant temperature for 1 hour;

[0059] 3) Using a peristaltic pump, add 6.25 parts of 2 wt% AIBN solution (the solvent is ethyl acetate) to the mixture after the reaction in step 2) for 30 minutes, and then continue the reaction at a constant temperature for 1.5 hours. After the reaction is completed, naturally cool to room temperature to obtain a main glue solution with a solid content of 50 wt%.

[0060] 4) Under light-proof conditions, 40 parts of the main adhesive solution and 39 parts of ethyl acetate were mixed evenly, 20 parts of the polyurethane acrylate solution and 1 part of the α-hydroxyketone derivative were added, and the mixture was mixed evenly again, allowed to stand, and defoamed to obtain an antistatic UV viscosity-reducing adhesive.

[0061] Preparation Example 2

[0062] The rest is the same as Preparation Example 1, except that, in step 2), the amount of methacryloyloxyethyltrimethylammonium chloride used is 2 parts.

[0063] Preparation Example 3

[0064] The rest is the same as Preparation Example 1, except that, in step 2), the amount of methacryloyloxyethyltrimethylammonium chloride used is 3 parts.

[0065] Preparation Example 4

[0066] The rest is the same as Preparation Example 1, except that, in step 2), the amount of methacryloyloxyethyltrimethylammonium chloride used is 0.5 parts.

[0067] Preparation Example 5

[0068] 1) Under nitrogen atmosphere, add 75 parts of isooctyl acrylate, 15 parts of methyl methacrylate, 4 parts of hydroxyethyl acrylate, 3 parts of acrylic acid, 2.5 parts of methacryloyloxyethyl trimethylammonium chloride, 0.25 parts of AIBN, and 100 parts of ethyl acetate into a reaction kettle with a reflux device and mix well, heat to 80°C, and continue the reaction for 3 hours when reflux appears on the condenser;

[0069] 2) adding 6.25 parts of 2 wt% AIBN solution (solvent: ethyl acetate) to the mixture after the reaction in step 1) using a peristaltic pump, and the dripping was completed in 1.5 hours, and then the reaction was continued at a constant temperature for 1 hour;

[0070] 3) Using a peristaltic pump, add 6.25 parts of 2 wt% AIBN solution (solvent: ethyl acetate) to the mixture after the reaction in step 2) for 30 minutes, then continue the reaction at a constant temperature for 1.5 hours. After the reaction is completed, cool naturally to room temperature to obtain a main glue solution.

[0071] Preparation Example 6

[0072] 1) Under nitrogen atmosphere, add 70 parts of isooctyl acrylate, 20 parts of methyl methacrylate, 3 parts of hydroxyethyl acrylate, 4 parts of acrylic acid, 0.5 parts of AIBN, and 100 parts of ethyl acetate into a reaction kettle with a reflux device and mix well, heat to 80°C, and continue the reaction for 3 hours when reflux appears on the condenser;

[0073] 2) adding a mixture of 2.0 parts of methacryloyloxyethyl trimethylammonium chloride, 0.25 parts of AIBN and 10.25 parts of ethyl acetate to the mixture after the reaction in step 1) using a peristaltic pump, the dripping is completed for 1.5 hours, and then the reaction is continued at a constant temperature for 1 hour;

[0074] 3) Using a peristaltic pump, add 12.5 parts of 2 wt% AIBN solution (solvent: ethyl acetate) to the mixture after the reaction in step 2) for 30 minutes, then continue the reaction at a constant temperature for 1.5 hours. After the reaction is completed, cool naturally to room temperature to obtain a main glue solution.

[0075] Preparation Example 7

[0076] The rest is the same as Preparation Example 1, except that the amount of the main glue solution used in step 4) is 50 parts.

[0077] Comparative Preparation Example 1

[0078] The rest is the same as Preparation Example 1, except that, in step 2), the amount of methacryloyloxyethyltrimethylammonium chloride used is 0.3 parts.

[0079] Comparative Preparation Example 2

[0080] The rest is the same as Preparation Example 1, except that, in step 2), the amount of methacryloyloxyethyltrimethylammonium chloride used is 3.5 parts.

[0081] Preparation of UV anti-viscosity film

[0082] Example 1

[0083] S1: AntiStat FA-2000, water, cyclohexanone and ethanol were mixed evenly in a mass ratio of 2.5:2:1:0.05, and then coated on the PO membrane substrate so that the thickness of the primer after drying was 0.5 μm;

[0084] S2. In the dark condition, the antistatic UV viscosity-reducing adhesive of Preparation Example 1 is coated on the PET release film to make the thickness of the dried UV viscosity-reducing adhesive 20 μm, and dried at 105° C. for 2 minutes;

[0085] S3: compound the product of step S1 and the product of step S2 under light-proof conditions, and age at 60° C. for 5 days to obtain a UV anti-viscosity film.

[0086] The drying in step S2 is performed at 100-105° C. for 1-3 minutes. The aging in step S3 is performed at 25-60° C. for 2-7 days.

[0087] Embodiment 2-7

[0088] The rest is the same as Example 1, except that in step S2, the antistatic UV viscosity-reducing adhesive of Preparation Example 2-7 of equal mass is used to replace the antistatic UV viscosity-reducing adhesive of Preparation Example 1.

[0089] Example 8

[0090] The rest is the same as Example 1, except that in step S1, the mass ratio of AntiStat FA-2000, water, cyclohexanone and ethanol is 1.0:1:0.5:0.03.

[0091] Example 9

[0092] The rest is the same as Example 1, except that in step S1, PVC film is used instead of PO film substrate.

[0093] Example 10

[0094] The rest is the same as Example 1, except that in step S1, the mass ratio of AntiStat FA-2000, water, cyclohexanone and ethanol is 0.5:1:0.5:0.03.

[0095] Embodiment 11

[0096] The rest is the same as Example 1, except that in step S1, the mass ratio of AntiStat FA-2000, water, cyclohexanone and ethanol is 3:1:0.5:0.03.

[0097] Comparative Example 1-2

[0098] The rest is the same as Example 1, except that in step S2, the antistatic UV viscosity-reducing adhesive of Preparation Example 1-2 of equal mass is used to replace the antistatic UV viscosity-reducing adhesive of Preparation Example 1.

[0099] The main adhesive solution in the above antistatic UV viscosity-reducing adhesive was subjected to performance tests 1-4, and the UV viscosity-reducing film was subjected to performance tests 5-8 below. The results are shown in Table 1:

[0100] 1. Hydroxyl value: Determine according to the method specified in GB / T 12008.3-89. The same sample shall be measured three times, and the error shall not exceed 1.0.

[0102] 2. Acid value: Determine according to the method specified in HG / T 2708-1995. The same sample shall be measured three times, and the error shall not exceed 0.5.

[0103] 3. Weight average molecular weight: The GPC instrument is Asilent 1100, tetrahydrofuran is used as the eluent, the flow rate is 1.0 ml / min, the temperature is 30°C, and the separation column is a polystyrene separation column.

[0104] 4. Tg: Weigh 10 mg of sample, use nitrogen as protective gas, heat up at a rate of 10°C / min, measure temperature in the range of -80°C to 10°C, and use DSC204 from NETZSCH, Germany.

[0105] 5. UV peeling strength test: refer to the standard GB / T 2792-2014 adhesive tape peeling strength test method, the test sample is a mirror polished silicon wafer, the peeling speed is 300mm / min, the UV light wavelength is 365nm, and the energy is 1500mJ / cm 2 .

[0106] 6. Surface resistance test: refer to the standard EN 1149-1-2006 Protective clothing. Electrostatic properties, Part 1: Test method for measuring surface resistivity, and perform surface resistance test on UV anti-viscosity film.

[0107] 7. Film tearing voltage test: Fix the UV anti-viscosity film sample on a stable working surface, and apply force along the edge of the sample with a handheld force gauge until the sample is completely torn apart. During the tearing process, use the ACL 300B electrostatic tester to record the film tearing voltage value. The test area is 1cm*1cm.

[0108] 8. Temporal stability of peeling force: Test method GB / T 2792-2014 Test method for peeling strength of adhesive tape, peeling speed 300mm / min, stick the product on a polished silicon wafer sample, place it at room temperature for 28 days, perform a 180° peeling strength test, record the test results, and calculate the attenuation rate of the peeling force compared to before UV.

[0109] Table 1 Test results

[0110]

[0111]

[0112] Table 2 Test results

[0113]

[0114] It can be clearly seen from Example 1 and Examples 10-11 that the change of AntiStat FA-2000 in the primer has a significant effect on the conductivity and the time-dependent loss of the peeling force. It is speculated that too much or too little antistatic coating liquid AntiStat FA-2000 in the primer is not conducive to the full dissolution of the polymer in AntiStat FA-2000 and its spreading on the surface of the substrate to form a dense primer layer connected to the antistatic UV viscosity-reducing adhesive layer. This connection can better conduct and release static charges, reduce the absorption of water, and prevent the peeling force from attenuating significantly over time. Only the primer prepared with the antistatic coating liquid AntiStat FA-2000, water, cyclohexanone, and ethanol in a mass ratio of 1.0-2.5:1.0-2:0.5-1:0.03-0.05 can form a dense primer layer.

[0115] From the experiments of changing the relative proportion of methacryloyloxyethyl trimethyl ammonium chloride in Examples 1-4 and Comparative Examples 1-2, it can be seen that: if the amount of methacryloyloxyethyl trimethyl ammonium chloride is too small, the antistatic effect is poor, the anti-sticking film cannot play an antistatic role, and the film tearing voltage is higher than 6V; if the amount of methacryloyloxyethyl trimethyl ammonium chloride is too large, it is easy to absorb moisture, resulting in poor stability of the peeling force over time.

[0116] The above detailed description is a specific description of one feasible embodiment of the present invention. The embodiment is not intended to limit the patent scope of the present invention. Any equivalent implementation or modification that does not deviate from the present invention should be included in the scope of the technical solution of the present invention.

Claims

1. An antistatic UV viscosity reducing adhesive, It is characterized in that The invention comprises the following raw materials in parts by weight: 40-50 parts of a main glue solution, 15-20 parts of a polyurethane acrylate solution, 25-60 parts of an organic solvent, and 0.5-5 parts of a photoinitiator. The main glue solution is obtained by solution polymerization of a soft monomer, a hard monomer, a functional monomer, and an unsaturated quaternary ammonium salt monomer under the action of an initiator. The mass ratio of the soft monomer, the hard monomer, the functional monomer, the unsaturated quaternary ammonium salt monomer, and the initiator is 50-80:10-15:2-10:0.5-3:0.1-1. The weight average molecular weight of the main glue is 450,000-650,000.

2. According to claim 1, the antistatic UV viscosity-reducing adhesive, It is characterized in that The mass ratio of the soft monomer, the hard monomer, the functional monomer, the unsaturated quaternary ammonium salt monomer and the initiator is 70-75:10-15:5-7:2-2.5:0.5-1, and the weight average molecular weight of the main rubber is 450,000-550,000.

3. The antistatic UV viscosity reducing adhesive according to claim 1, It is characterized in that The unsaturated quaternary ammonium salt monomer is selected from one or a combination of two or more of acryloyloxyethyl trimethyl ammonium chloride, methacryloyloxyethyl trimethyl ammonium chloride, allyl trimethyl ammonium chloride, and acryloyloxyethyl trimethyl ammonium chloride; the soft monomer is selected from one or a combination of two or more of ethyl acrylate, isooctyl acrylate, and dodecyl methacrylate; the hard monomer is selected from one or a combination of two or more of methyl acrylate, methyl methacrylate, ethyl methacrylate, n-butyl methacrylate, and vinyl acetate; the functional monomer is selected from one or a combination of two or more of acrylic acid, methacrylic acid, hydroxyethyl acrylate, hydroxypropyl acrylate, hydroxyethyl methacrylate, hydroxypropyl methacrylate, and diethylene glycol monoacrylate; the initiator is selected from one or a combination of two or more of azobisisobutyronitrile, azobisisoheptylnitrile, and dibenzoyl peroxide.

4. The antistatic UV viscosity reducing adhesive according to claim 3, It is characterized in that The unsaturated quaternary ammonium salt monomer is methacryloyloxyethyl trimethylammonium chloride; the functional monomer is a compound of hydroxyethyl acrylate and acrylic acid in a mass ratio of 3-4:3-4; and the initiator is azobisisobutyronitrile.

5. The antistatic UV viscosity reducing adhesive according to claim 1, It is characterized in that The main glue solution is prepared by a method comprising the following steps: 1) Under an inert atmosphere, add the soft monomer, the hard monomer, the functional monomer, the first initiator, and the solvent into a reaction kettle with a reflux device, mix them evenly, and heat them to react; 2) adding a mixture of an unsaturated quaternary ammonium salt monomer, a second initiator and a solvent to the mixed system after the reaction in step 1) is completed, and continuing the reaction at a constant temperature after the addition is completed; 3) adding the third initiator solution dropwise to the mixed system after the reaction in step 2), continuing the reaction at a constant temperature after the addition, and cooling naturally to room temperature after the reaction to obtain a main glue solution.

6. The antistatic UV viscosity-reducing adhesive according to claim 1, It is characterized in that The solid content of the main glue solution is 48-52wt%; the solid content of the polyurethane acrylate solution is 75-85wt%, and the functionality of the polyurethane acrylate in the polyurethane acrylate solution is 5-7.

7. A method for preparing the antistatic UV viscosity-reducing adhesive according to any one of claims 1 to 6, It is characterized in that The steps include: Under light-proof conditions, the main adhesive solution and the organic solvent are mixed evenly, the polyurethane acrylate solution and the photoinitiator are added, and the mixture is mixed evenly again, allowed to stand, and defoamed to obtain an antistatic UV viscosity-reducing adhesive.

8. A UV anti-viscosity film, It is characterized in that The invention comprises a release film, the antistatic UV viscosity-reducing adhesive according to any one of claims 1 to 7, a primer, and a substrate which are arranged in sequence.

9. The UV anti-viscosity film according to claim 8, It is characterized in that The primer is formed by mixing an antistatic coating liquid, water, cyclohexanone and ethanol in a mass ratio of 1.0-2.5:1.0-2:0.5-1:0.03-0.05; the antistatic coating liquid includes poly(3,4-ethylenedioxythiophene), sodium polystyrene sulfonate and water; preferably, the antistatic coating liquid includes poly(3,4-ethylenedioxythiophene), sodium polystyrene sulfonate and water in a mass ratio of 1:1-3:250-270; more preferably, the antistatic coating liquid includes poly(3,4-ethylenedioxythiophene), sodium polystyrene sulfonate and water in a mass ratio of 1:2-3:260-270; the most preferred antistatic coating liquid is AntiStat FA-2000.

10. A method for preparing the UV anti-viscosity film according to claim 8, It is characterized in that The steps include: S1: evenly mix the antistatic coating liquid, water, cyclohexanone and ethanol, and then apply the mixture on the substrate; S2, in the dark, apply the antistatic UV viscosity-reducing adhesive on the release film and dry it; S3: compounding the product of step S1 and the product of step S2 under light-proof conditions, and aging them to obtain the above-mentioned UV viscosity-reducing film.

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