AG coating liquid composition, AG coating liquid and application thereof, AG film, polarizer and liquid crystal display

Abstract

The present invention relates to the technical field of polarizer protective films, and provides an AG coating liquid composition, an AG coating liquid and its application, an AG film, a polarizer and a liquid crystal display. The AG coating liquid composition includes an acrylic prepolymer, an acrylate monomer and a functional factor; wherein, relative to 100 parts by weight of the functional factor, the content of the acrylic prepolymer is 60-500 parts by weight, and the content of the acrylate monomer is 30-300 parts by weight; the functional factor is an organically modified silica microsphere, and the silica microsphere is a monodisperse quartz crystal silica microsphere. The AG film obtained by the AG coating liquid composition of the present invention is applied to polarizer protection, and has the advantages of high clarity, low flash point and good appearance.

Description

Technical Field

[0001] The present invention relates to the technical field of polarizer protective films, and in particular to an AG coating liquid composition, an AG coating liquid and applications thereof, an AG film, a polarizer and a liquid crystal display. Background Art

[0002] Polarizer is one of the three key raw materials for LCD panels. It has the characteristics of high technical threshold and high market concentration. The global market size exceeds 10 billion US dollars. As a key raw material required for liquid crystal display imaging technology, polarizer is mainly used to produce liquid crystal display modules and is applied to terminal consumer electronic products such as televisions, computers, mobile phones and other liquid crystal imaging fields. There are two polarizers in the liquid crystal display module, which are attached to both sides of the glass substrate. The lower polarizer is used to convert the light beam generated by the backlight source into polarized light, and the upper polarizer is used to analyze the polarized light after liquid crystal electrical modulation to produce light and dark contrast, thereby producing a display picture. The imaging of the liquid crystal display module must rely on polarized light. Without any polarizer, the liquid crystal display module cannot display images. Considering the fragility of the polyvinyl alcohol (PVA) layer material, making a protective layer at both ends becomes a concise problem to be solved.

[0003] At present, the protective layer is mainly composed of AG (anti-glare) film with no luminous flux loss. There are two main technologies for realizing AG film used in the original polarizer protection: 1. Ordinary commercially available spherical particles are used in combination with resin for dispersion and coating. It is necessary to ensure that the particles are evenly spread on the surface of the substrate and there is no overlap between the particles. On the one hand, the uniformity of particle dispersion is difficult to guarantee with this method (there is often a problem of poor particle dispersion), and the appearance of the finished product after coating cannot be guaranteed (the clarity of the film after coating is low, the flash point is serious, and the apparent horizontal and vertical lines are serious); on the other hand, it is too idealistic for spherical particles to be simply and evenly spread on the surface. It is difficult to guarantee the corresponding design requirements in actual operation, and stable production cannot be carried out. 2. Ordinary particles are used for preparation and dispersion coating. On the one hand, the clarity and flash point cannot be guaranteed with this method, and on the other hand, the particles are very easy to agglomerate, resulting in poor appearance.

[0004] Therefore, it is very necessary to develop an AG film with high clarity, low flash point and good performance for protecting polarizers. Summary of the invention

[0005] The purpose of the present invention is to overcome the above-mentioned problems existing in the prior art, and to provide an AG coating liquid composition, an AG coating liquid obtained from the AG coating liquid composition, and an AG film; the use of the AG coating liquid composition, the AG coating liquid and the AG film in a polarizer protective film; and a polarizer comprising the AG film, and a liquid crystal display comprising the polarizer. The AG film obtained from the AG coating liquid composition of the present invention is applied to polarizer protection, and has the advantages of high clarity, low flash point and good appearance.

[0006] The first aspect of the present invention provides an AG coating liquid composition, which comprises an acrylic prepolymer, an acrylic ester monomer and a functional factor; wherein, relative to 100 parts by weight of the functional factor, the content of the acrylic prepolymer is 60-500 parts by weight, and the content of the acrylic ester monomer is 30-300 parts by weight;

[0007] The functional factor is organically modified silica microspheres, and the silica microspheres are monodisperse quartz crystal silica microspheres.

[0008] The inventors of the present invention have discovered that organically modified silica microspheres are used as AG particles in combination with acrylic prepolymers and acrylic ester monomers, and that the monodisperse quartz crystal silica microspheres have high hardness and high wear resistance. On the one hand, it can ensure that the coating has high wear resistance and high hardness after coating, and at the same time, the organic modification can ensure the uniformity of particle dispersion. In the system of the present invention, not only can the size of the synthesized particles be effectively controlled, but the crystal form obtained after sintering can effectively ensure the clarity of the film after coating, so that the AG film prepared by the AG coating liquid composition has the advantages of high clarity, low flash point and good appearance, and is very suitable for protecting polarizers.

[0009] The second aspect of the present invention provides an AG coating liquid, wherein the AG coating liquid contains the AG coating liquid composition described in the first aspect of the present invention, or is prepared from the AG coating liquid composition.

[0010] The third aspect of the present invention provides an AG film, comprising a substrate layer and an AG coating layer coated on the surface of the substrate layer; the AG coating layer is prepared from the AG coating liquid described in the second aspect of the present invention, or is prepared from the AG coating liquid composition described in the first aspect of the present invention.

[0011] The fourth aspect of the present invention provides a polarizer, which comprises the AG film described in the third aspect of the present invention, and the AG film is arranged on one side or both sides of the polarizer.

[0012] A fifth aspect of the present invention provides a liquid crystal display having the polarizer according to the fourth aspect of the present invention disposed on one side or both sides of a liquid crystal display panel.

[0013] The present invention adopts the above technical solution to achieve the following beneficial effects:

[0014] (1) In the AG coating liquid composition provided by the present invention, when the organically modified monodisperse quartz crystal silica microspheres are used as AG particles (functional factors) in combination with acrylic prepolymers and acrylic ester monomers, the AG film obtained from the AG coating liquid composition is applied to polarizer protection and has the advantages of high clarity, low flash point and good appearance;

[0015] (2) The AG film obtained by the AG coating liquid composition provided by the present invention uses organically modified monodisperse quartz crystal silica microspheres as AG particles, which ensures the clarity and flash point of the AG film, solves the problem of poor coating, and reduces production costs.

[0016] The endpoints and any values ​​of the ranges disclosed in this article are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of each range, the endpoint values ​​of each range and the individual point values, and the individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed in this article. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Shown is a schematic diagram of the structure of the AG membrane provided in Example B1. DETAILED DESCRIPTION

[0018] The specific embodiments of the present invention are described in detail below. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0019] Unless otherwise defined, all scientific and technical terms used in the present invention have the same meanings as commonly understood by one of ordinary skill in the art to which the present invention relates.

[0020] The first aspect of the present invention provides an AG coating liquid composition, which comprises an acrylic prepolymer, an acrylic ester monomer and a functional factor; wherein, relative to 100 parts by weight of the functional factor, the content of the acrylic prepolymer is 60-500 parts by weight, and the content of the acrylic ester monomer is 30-300 parts by weight;

[0021] The functional factor is organically modified silica microspheres, and the silica microspheres are monodisperse quartz crystal silica microspheres.

[0022] The present invention uses the above-mentioned acrylic prepolymer, acrylic ester monomer and functional factor in combination, so that the prepared polarizer using AG film has good clarity, flash point and appearance performance. In order to make the clarity, flash point and appearance better, the ratio of the three components is further preferred. Preferably, relative to 100 parts by weight of the functional factor, the content of the acrylic prepolymer is 300-450 parts by weight, and the content of the acrylic ester monomer is 80-200 parts by weight. More preferably, relative to 100 parts by weight of the functional factor, the content of the acrylic prepolymer is 380-400 parts by weight, and the content of the acrylic ester monomer is 90-100 parts by weight.

[0023] In the present invention, the acrylic prepolymer is a multifunctional base resin.

[0024] In one example, the multifunctional base resin is a photocurable resin.

[0025] In one example, the multifunctional base resin is an acrylic resin; the acrylic resin is selected from any one or more of epoxy acrylic resin, polyester acrylic resin and polyurethane acrylic resin.

[0026] In one example, the epoxy acrylic resin is selected from the nine-functional epoxy acrylic resin oligomer CNUVE151 NS; the polyester acrylic resin is selected from the nine-functional polyester acrylic resin oligomer CN8201NS; and the polyurethane acrylic resin is selected from the nine-functional polyurethane acrylic resin oligomer CN983NS.

[0027] In one example, the acrylic acid ester monomer is an acrylic acid ester monomer or a methacrylic acid ester monomer with a functionality of ≧2.

[0028] In one example, the acrylate monomer is selected from any one or more combinations of dipentaerythritol hydroxypentaacrylate, pentaerythritol triacrylate, pentaerythritol tetraacrylate, dipentaerythritol hexaacrylate, trimethylolpropane ethoxy triacrylate, 1,6-hexanediol diacrylate, trimethylenepropyl triacrylate, propoxylated glycerol triacrylate, propoxylated glyceryl triacrylate, ethylene glycol diacrylate and tripropylene glycol diacrylate.

[0029] In the present invention, the "organic modification" is organic coupling grafting modification, which means that the microspheres are treated with a coupling agent and then reacted with an organic substance for grafting modification.

[0030] In one example, the coupling agent is selected from a silane coupling agent and / or a titanate coupling agent, preferably a silane coupling agent, and the silane coupling agent is selected from one or more of KH550, KH560 and KH792.

[0031] In one example, the organic substance is a carboxylic acid compound, and the carboxylic acid compound is selected from long-chain fatty acid compounds, preferably stearic acid.

[0032] Preferably, the particle size of the functional factor is 1 μm-5 μm, preferably 2 μm-4 μm.

[0033] In the present invention, the term "particle size" refers to the geometric spherical diameter of a single particle rather than the average value. When it is a range, it means that the particle size of the particles of the same material falls within the range. At the same time, the present invention allows a certain error, that is, when the particle size of particles less than 5% of the total number is not within the required range, it is considered to meet the requirements. The particle size of the functional factor in the present invention is measured by transmission electron microscopy.

[0034] In one example, the portion of the silica microspheres in the functional factor accounts for 92-98% by weight of the total weight of the functional factor, preferably 95-98%.

[0035] In one example, the carboxylic acid compound in the functional factor accounts for 1-5% by weight, preferably 1-3% by weight, of the total weight of the functional factor.

[0036] In one embodiment of the present invention, the functional factor is prepared by a method comprising the following steps:

[0037] (1) bringing the silica microspheres into first contact with the coupling agent;

[0038] (2) The material obtained in step (1) is brought into second contact with a carboxylic acid compound.

[0039] Wherein, in the step (1), the conditions for the first contact include: temperature of 50-65°C, mixing speed of 50-500 rpm / min, and mixing time of 6-10h.

[0040] In one example, the coupling agent is selected from silane coupling agents, and the silane coupling agent is selected from one or more of KH792, KH550 and KH560.

[0041] Wherein, in the step (2), the conditions for the second contact include: temperature of 55-65°C, mixing speed of 50-500 rpm / min, and mixing time of 2-5h.

[0042] In one example, the carboxylic acid compound is selected from long-chain fatty acid compounds, preferably stearic acid.

[0043] The method for preparing the functional factor further comprises step (3): filtering to remove by-products, vacuum drying and grinding.

[0044] In one embodiment of the present invention, the organic coupling grafted modified silica microspheres are prepared by a method comprising the following steps:

[0045] (1) After mixing the silica microspheres and the solvent and subjecting them to ultrasonic oscillation, the temperature is raised to 50-65° C., a coupling agent is slowly added dropwise, and the reaction is stirred at 50-500 rpm / min under condensation reflux conditions for 6-10 hours;

[0046] (2) adding the long-chain fatty acid compound to the material obtained in step (1), and continuing to stir the reaction at 50-500 rpm / min for 2-5 hours;

[0047] (3) After cooling the material after the reaction in step (2), the by-products are removed by solid-liquid separation, and then vacuum drying and grinding are performed.

[0048] The functional factor obtained by the preparation method of the functional factor may have the situation that the silica microspheres are not completely organically modified. In this case, the portion of silica microspheres in the functional factor accounts for 92-98 weight % of the total weight of the functional factor, and the portion of carboxylic acid compounds accounts for 1-5 weight % of the total weight of the functional factor.

[0049] Preferably, the silica microspheres used in the AG coating liquid composition of the present invention are solid silica microspheres, hollow silica microspheres, or a combination of both.

[0050] In one embodiment of the present invention, the silica microspheres are prepared by a method comprising the following steps:

[0051] (a) bringing the surfactant, the acidic solution, the alcohol solution and the soluble silicon source into a third contact;

[0052] (b) contacting the material obtained in step (a) with an oil phase solution for a fourth time;

[0053] (c) subjecting the material obtained in step (b) to the steps of evaporating water, solid-liquid separation, washing and drying;

[0054] (d) subjecting the material obtained in step (c) to high temperature sintering.

[0055] In the step (a), the surfactant is selected from one or more of cetrimonium bromide (CTAB), cetyltrimethylammonium bromide, benzalkonium chloride or tetradecyltrimethylammonium bromide.

[0056] The acidic solution may be a combination of one or more of hydrochloric acid, sulfuric acid or nitric acid.

[0057] The alcohol solution is selected from low-carbon alcohols, for example, including but not limited to a combination of one or more of ethanol, methanol or isopropanol.

[0058] The soluble silicon source is selected from tetraethyl orthosilicate (TEOS), methyl orthosilicate or aminosilane or a combination of one or more thereof. Here, the soluble silicon source refers to a silicon source liquid.

[0059] Preferably, the volume of the acidic solution is 5 mL to 15 mL (the concentration of the acidic solution is 1 mol / L [H + Preferably, the volume of the acidic solution is 8 mL to 12 mL (the concentration of the acidic solution is 1 mol / L [H + ]). The inventors of the present invention have found that maintaining such a ratio between the concentration of the silicon source and the acidic solution is conducive to obtaining silicon microspheres with uniform size and good structure. If the hydrogen ion concentration per unit silicon source is low, it is not conducive to the hydrolysis of the silicon source; if the hydrogen ion concentration per unit silicon source is high, the hydrolysis rate of the silicon source is fast, which will destroy the structure of the silicon microspheres, and a hemispherical structure may be generated, resulting in poor structure and size of the silicon microspheres.

[0060] The “silicon source liquid” refers to a silicon source in liquid form, rather than a silicon source solution obtained by dissolving in a solvent.

[0061] The term "one Si atom unit" means that the chemical structure of the silicon source liquid contains only one Si atom, for example, Si(OC 2 H 5 ) 4 can be recorded as a unit, and K 2 Al 2 Si 6 O 16 It can be recorded as six units.

[0062] The “1 mL of silicon source liquid calculated as one Si atom unit” means that the volume of the silicon source liquid is calculated as mL per Si atom. For example, if the silicon source compound contains one Si atom, 1 mL is used, and if it contains two Si atoms, 0.5 mL is used.

[0063] In the step (b), the oil phase solution includes but is not limited to a combination of one or more of benzene, butanone or n-heptane.

[0064] In one example, the conditions for the third contact include: a temperature of 20-30° C., a mixing speed of 40-60 rpm / min, and a mixing time of 0.5-3 h.

[0065] In one example, the fourth contacting conditions include: a temperature of 25-45° C. and a time of 2-4 h.

[0066] In the step (c), controlling the temperature and time of evaporating water can make the prepared silica microspheres present a hollow or solid structure.

[0067] In one embodiment, the temperature for evaporating water is 100-120° C., and the evaporation time is 0.5-2 hours. The evaporation time is within 0.5-1 hour for hollow microspheres, and within 1 hour-2 hours for solid microspheres.

[0068] In one example, the sintering conditions in step (d) include: sintering in an inert atmosphere at 700° C.-900° C. for 3-5 hours. The inert gas may be argon.

[0069] Preferably, the AG coating liquid composition further comprises an auxiliary agent.

[0070] In one example, the auxiliary agent includes a photoinitiator and a leveling agent. Relative to 100 parts by weight of the functional factor, the content of the photoinitiator is 30-120 parts by weight, and the content of the leveling agent is 30-120 parts by weight.

[0071] In one example, the photoinitiator is a cleavage-type photoinitiator, which includes but is not limited to one or more of photoinitiator 184, photoinitiator 1173, photoinitiator 907, photoinitiator 369, photoinitiator 1490, and photoinitiator 1700.

[0072] In one example, the leveling agent is a silicon-modified leveling agent, which can be selected from one or more of BYK-307, BYK-333, BYK-352, BYK-354, BYK-377, BYK-378 and BYK-358.

[0073] In the present invention, the AG coating liquid composition further comprises an organic solvent; the organic solvent is selected from any one or more of alcohols, ketones, alkanes, esters and ethers.

[0074] In one example, the organic solvent is selected from any one or more of butanone, propylene glycol methyl ether, 4-methyl-2-pentanone, propylene glycol methyl ether acetate, ethyl acetate and butyl acetate, more preferably a combination of butanone and propylene glycol methyl ether.

[0075] In one embodiment of the present invention, the AG coating liquid composition includes acrylic prepolymer, acrylic ester monomer, organically modified silica microspheres, a photoinitiator, a leveling agent and a solvent.

[0076] The first aspect of the present invention claims a composition, wherein each component can be stored separately, or several components can be stored in a group. It is understood that for the convenience of storage, transportation and sale, the composition may not include a solvent. The purchaser can add the solvent by himself when preparing the AG coating liquid composition.

[0077] The second aspect of the present invention provides an AG coating liquid, wherein the AG coating liquid contains the AG coating liquid composition described in the first aspect of the present invention, or is prepared from the AG coating liquid composition.

[0078] The AG coating liquid of the second aspect of the present invention can be obtained by simply mixing the composition described in the first aspect of the present invention.

[0079] The third aspect of the present invention provides an AG film, comprising a substrate layer and an AG coating layer coated on the surface of the substrate layer; the AG coating layer is prepared from the AG coating liquid described in the second aspect of the present invention, or is prepared from the AG coating liquid composition described in the first aspect of the present invention.

[0080] In one example, the substrate layer material is selected from a substrate used for protecting a specific polarizer in the art, for example, the substrate layer material may be a triacetate cellulose film (TAC).

[0081] In order to make the clarity, flash point and appearance of the AG film used in the prepared polarizer better, the thickness of the AG coating is preferably 1 μm-5 μm, more preferably 2 μm-4 μm.

[0082] The present invention also provides a method for preparing the AG film according to the third aspect of the present invention, the method comprising the following steps using the AG coating liquid composition according to the first aspect of the present invention as a raw material:

[0083] (i) mixing the AG coating liquid composition to obtain an AG coating liquid;

[0084] (ii) applying the AG coating solution obtained in step (i) onto the substrate layer;

[0085] (iii) drying the substrate layer treated in step (ii) and curing the AG coating liquid.

[0086] Wherein, in step (i), acrylic prepolymer, acrylic ester monomer, organically modified microspheres, photoinitiator, leveling agent and solvent are mixed uniformly according to a proportion to obtain an AG coating liquid.

[0087] The step (ii) also includes adjusting the solid content of the AG coating liquid to 20-40%, so that the AG coating liquid can be more easily and evenly coated, thereby improving the flash point and clarity of the AG film.

[0088] In the step (iii), the drying conditions include: a drying temperature of 80-120° C. and a drying time of 1-10 minutes.

[0089] In the step (iii), the curing is preferably ultraviolet light curing, and the ultraviolet light dosage is preferably 300-500 mJ / cm 2 .

[0090] The fourth aspect of the present invention provides a polarizer, which comprises the AG film described in the third aspect of the present invention, and the AG film is arranged on one side or both sides of the polarizer.

[0091] A fifth aspect of the present invention provides a liquid crystal display having the polarizer according to the fourth aspect of the present invention disposed on one side or both sides of a liquid crystal display panel.

[0092] In the present invention, when numbers are used to distinguish terms, such as "first contact", "second contact", "third contact", "fourth contact", etc., the numbers in this expression only serve to distinguish and do not indicate the order of precedence. Unless otherwise specified, the size of the numbers does not have any limiting effect on the technical solution.

[0093] 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.

[0094] Unless otherwise specified, the materials and reagents used in the following examples can be obtained from commercial sources.

[0095] The present invention is described in detail below in conjunction with specific embodiments, which are used to understand but not to limit the present invention.

[0096] Preparation Example 1

[0097] A method for preparing silicon dioxide microspheres comprises the following steps:

[0098] (1) Add 0.12 g CTAB into a 250 ml three-necked flask, add 4 ml 1 mol / L hydrochloric acid, 4 mL C 2 H 5 OH, 0.4mLTEOS (molecular formula: Si(C 2 H 5 O) 4 ), magnetic stirring, temperature was 25°C, mixing speed was 50 rpm / min, and mixing time was 0.8 h;

[0099] (2) adding 50 mL of benzene to the mixed solution obtained in step (1), adjusting the temperature of the oil bath to 35° C., and performing the hydrolysis reaction for 3 h;

[0100] (3) adjusting the temperature to 105° C. and distilling out the water in the mixed solution obtained in step (2) for 0.5-1 h until the solution in the water separator becomes clear and transparent and the reaction is stopped;

[0101] (4) Take the centrifugal precipitation product, centrifuge and wash it with a mixture of isopropanol and water (volume ratio 1:1), and finally dry the precipitate under the centrifuge tube to obtain SiO 2 Hollow microsphere samples;

[0102] (5) The SiO obtained in step (4) 2 The hollow microsphere sample was added into a tube furnace for calcination at 800°C under argon protection for 4 h to obtain quartz crystal silica microspheres.

[0103] Preparation Example 2

[0104] A method for preparing silica microspheres is carried out according to the method of Preparation Example 1, except that 3 ml of 1 mol / L hydrochloric acid is added in step (1) to obtain SiO microspheres with a particle size of about 2-3 μm. 2 Hollow microsphere samples.

[0105] Preparation Example 3

[0106] A method for preparing silica microspheres is carried out according to the method of Preparation Example 1, except that 2 ml of 1 mol / L hydrochloric acid is added in step (1) to obtain SiO microspheres with a particle size of about 3-4 μm. 2 Hollow microsphere samples.

[0107] Preparation Example 4

[0108] A method for preparing silicon dioxide microspheres is carried out according to the method of Preparation Example 1, except that the evaporation time in step (3) is 2 hours, and the obtained SiO microspheres have a particle size of about 1-2 μm. 2 Solid microsphere samples.

[0109] Preparation Example 5

[0110] A method for preparing silicon dioxide microspheres is carried out by referring to the method of Preparation Example 1, except that step (5) is not performed to obtain SiO microspheres with a particle size of about 1-2 μm. 2 Hollow microsphere sample (non-quartz crystal type).

[0111] Preparation Example 6-11

[0112] A method for preparing organic coupling grafted modified silica microspheres comprises the following steps:

[0113] (1) 2 g of silica microspheres and 75 ml of solvent were added to a 250 ml three-necked flask, and after ultrasonic oscillation for 30 min, the temperature was raised to 60 ° C, and 2% of silane coupling agent KH550 was slowly added dropwise. Under condensation reflux conditions, rapid mechanical stirring was performed at 300 rpm / min for 8 h;

[0114] The silica microspheres added in Preparation Examples 6-10 were obtained from Preparation Examples 1-5. ;

[0115] Commercially available silica microspheres (Lianrui DQ1028L, non-quartz crystal) were added to Preparation Example 11. ;

[0116] (2) Add 2% stearic acid into a three-necked flask at 60°C and continue stirring at 300 rpm / min for 3 h. Then, cool the reaction solution naturally to room temperature and filter it.

[0117] (3) The obtained filter cake is subjected to Soxhlet extraction to remove excess coupling agent, stearic acid and by-products generated during the reaction, and then vacuum dried and ground to obtain organic coupling grafted modified silica microspheres.

[0118] In the obtained organic coupling graft modified silica microspheres, the silica microspheres account for 90-95% of the total weight, the stearic acid modified part accounts for 1-3% of the total weight, and the remaining content is the silane coupling agent modified part.

[0119] In the following examples, unless otherwise specified, all components used were commercially available analytically pure. 1 part by weight represents 1 g.

[0120] Example A Group

[0121] The following Group A examples in Table 1 are used to illustrate the AG coating fluid composition of the present invention.

[0122] Table 1

[0123]

[0124]

[0125]

[0126] Note: The amount of each component added in Table 1 is in parts by weight.

[0127] Example B Group

[0128] Group B examples are used to illustrate the AG film prepared by the AG coating liquid composition of the present invention.

[0129] Example B1

[0130] A polarizer protective AG film is prepared by a method comprising the following steps:

[0131] (i) mixing the AG coating liquid composition prepared in Example 1 uniformly to obtain an AG coating liquid;

[0132] (ii) diluting the AG coating solution obtained in step (i) to a solid content of 35%, and coating the solution on a TAC substrate (Konica Minolta);

[0133] (iii) The substrate layer treated in step (ii) was placed in a circulation oven at 100°C for 2 minutes for drying, and then subjected to a 400 mJ / cm 2 The AG film is obtained by irradiating the TAC substrate with ultraviolet light. The thickness of the TAC substrate is 125 μm, and the thickness of the AG coating is 3 μm. The schematic diagram of the structure of the polarizer protective AG film is shown in Figure 1 .

[0134] Example B2

[0135] A polarizer protective AG film is prepared according to the preparation method of Example B1, except that the AG coating liquid composition of Example 2 is used in step (i) of Example B2, and the thickness of the AG coating layer in step (iii) is 5 μm.

[0136] Example B3

[0137] A polarizer protective AG film is prepared according to the preparation method of Example B1, except that the AG coating liquid composition of Example 3 is used in step (i) of Example B3, and the thickness of the AG coating layer in step (iii) is 4 μm.

[0138] Examples B4-B10

[0139] A polarizer protective AG film is prepared by referring to the preparation method of Example B1, except that the AG coating liquid compositions in Example 4a, Example 4b, Example 4c, Example 5a, Example 5b, Example 5c and Example 5d are respectively used in step (i) of Example B4-B10.

[0140] Comparative Examples DB1-DB4

[0141] A polarizer protective AG film is prepared according to the preparation method of Example B1, except that the AG coating liquid compositions of Comparative Examples 1-4 are respectively used in step (i) of Comparative Examples DB1-DB4.

[0142] Test Case

[0143] (1) Using a CS-720 clarity haze meter, the clarity of the AG films provided in Group B Examples and Comparative Examples was measured. The results are recorded in Table 2.

[0144] (2) The light transmittance of the AG films provided in the examples and comparative examples was measured using a WGT-S light transmittance meter. The results are recorded in Table 2.

[0145] (3) Use a green screen, place the AG film on the screen surface, observe the bright spots of AG, and record the results in Table 2.

[0146] (4) According to the industry standard, observe the appearance of the AG coating on the AG film under a strong light in a dark room. If there are no vertical lines, record it as OK.

[0147] Table 2

[0148] Serial number Clarity Light transmittance Flash point Appearance Example B1 96.2％ 88.5％ OK OK Example B2 94.5％ 88.2％ OK OK Example B3 98.8％ 89.5％ OK OK Example B4 98.3％ 89.1％ OK OK Example B5 98.2％ 88.9％ OK OK Example B6 98.5％ 89.4％ OK OK Example B7 93.5％ 89.0％ OK OK Example B8 95.2％ 88.7％ OK OK Example B9 92.3％ 88.4％ OK OK Example B10 92.8％ 88％ OK OK Comparative Example DB1 53.2％ 87.5％ NG NG Comparative Example DB2 46.5％ 87.2％ NG NG Comparative Example DB3 65.2％ 87％ NG NG Comparative Example DB4 38.9％ 87.9％ NG NG

[0149] As can be seen from Table 2, the polarizer protective AG film provided by the present invention has the advantages of high clarity, low flash point and good appearance. In the polarizer protective AG film, acrylic prepolymer, acrylate monomer and silica microspheres are used in a reasonable ratio, and the particle size of the silica microspheres and the solid or hollow selection are selected reasonably. The desired crystal form is obtained by sintering, and the AG film with high clarity, low flash point and good appearance suitable for the use of the present technology can be obtained by organic grafting modification.

[0150] In addition, the results of comparative example DB show that ordinary silica microspheres, which have not been organically modified, have substandard clarity, and their flash point and appearance performance are also poor; and even if the commercially available silica microspheres are modified using the present technical solution, their clarity still does not meet the standards, and their flash point and appearance performance are also poor, and they are not suitable for use in polarizer protective AG films.

[0151] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An AG film for polarizer, characterized in that: The invention comprises a substrate layer and an AG coating layer coated on the surface of the substrate layer, wherein the substrate layer is a 125 μm triacetate cellulose film, the AG coating layer has a thickness of 1-5 μm, and the AG coating layer is made of an AG coating liquid, wherein the AG coating liquid comprises an acrylic prepolymer, an acrylic ester monomer, a functional factor, a photoinitiator, a leveling agent, and an organic solvent; wherein, relative to 100 parts by weight of the functional factor, the content of the acrylic prepolymer is 60-500 parts by weight, the content of the acrylic ester monomer is 30-300 parts by weight, the content of the photoinitiator is 30-120 parts by weight, the content of the leveling agent is 30-120 parts by weight, the content of the organic solvent is 200-500 parts by weight, and the leveling agent is BYK-333; The functional factor is an organically modified silica microsphere, the silica microsphere is a monodisperse quartz crystal silica microsphere, and the particle size of the functional factor is 1-5 μm; The functional factor is prepared by treating silica microspheres with a silane coupling agent and then reacting with stearic acid for grafting modification. The silica microspheres in the functional factor account for 90-95% of the total weight of the functional factor, the stearic acid modified part accounts for 1-3% of the total weight of the functional factor, and the rest is the silane coupling agent modified part; The preparation method of the silica microspheres is: (a) Mix 0.12 g of cetrimonium bromide, 2-4 mL of 1 mol / L hydrochloric acid, 4 mL of ethanol and 0.4 mL of ethyl orthosilicate; (b) mixing the material obtained in step (a) with 50 mL of benzene and reacting at 35° C. for 3 h; (c) evaporating the material obtained in step (b) at 105° C. for 0.5-2 h until the solution in the water separator is clear and transparent, stopping the reaction, taking the centrifugal precipitate and washing it by centrifugation with a mixture of isopropanol and water in a volume ratio of 1:1, and drying the precipitate to obtain silica microspheres with a particle size of 1-5 μm, wherein the silica microspheres are solid silica microspheres, hollow silica microspheres, or a combination of both; (d) The material obtained in step (c) was calcined at 800° C. for 4 h under argon protection to obtain quartz crystal silica microspheres.

2. The AG film according to claim 1, wherein The particle size of the functional factor is 2 μm-4 μm.

3. The AG film according to claim 1, wherein The thickness of the AG coating is 2 μm-4 μm.

4. The AG film according to claim 1, wherein The acrylic prepolymer is selected from any one or more of epoxy acrylic resin, polyester acrylic resin and polyurethane acrylic resin.

5. The AG film according to claim 4, wherein: The epoxy acrylic resin is selected from the nine-functional epoxy acrylic resin polymer CNUVE151 NS; the polyester acrylic resin is selected from the nine-functional polyester acrylic resin polymer CN8201NS; and the polyurethane acrylic resin is selected from the nine-functional polyurethane acrylic resin polymer CN983NS.

6. The AG film according to claim 1, wherein The functionality of the acrylic ester monomer is ≥2.

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