Paint for preparing reflective coating and application thereof

Abstract

The invention discloses paint for preparing a reflective coating and application of the paint, and belongs to the technical field of projection. The coating comprises the following components in parts by weight: 5-40 parts of film-forming resin, 0.5-10 parts of a curing agent, 5-20 parts of metal light-reflecting material slurry, 0.2-5 parts of a light-absorbing material, 0.1-5 parts of an auxiliary agent and 50-90 parts of a solvent. Wherein the film-forming resin comprises thermoplastic acrylic resin and thermosetting hydroxy acrylic resin, the solid content of the metal reflective material slurry is 5-70%, the molecular weight of the thermoplastic acrylic resin is greater than 30000 g / mol, and the hydroxyl value of the thermosetting hydroxy acrylic resin is 15-50, so that the reflectivity and optical gain of the reflective coating can be improved.

Description

Technical Field

[0001] The present invention relates to the field of projection technology, and particularly to a coating for preparing a reflective coating and its application. Background Art

[0002] Laser TVs emit light using the passive light-emitting principle of reflective imaging, and their projection screens determine the imaging effect of their pictures. The projection screen includes a Fresnel base film, a reflective coating, a polyurethane reactive hot melt adhesive (PUR), and a non-woven fabric laminated in sequence. Among them, the reflective coating has the advantages of protecting the base film, improving the reflection efficiency, and optimizing the optical performance.

[0003] In related technologies, the coatings for preparing reflective coatings usually include film-forming resins, aluminum silver powder, additives, solvents, etc. The film-forming resins are, for example, acrylic resins, polyurethane resins, epoxy resins, etc.

[0004] However, there is still a need for improvement in the reflectivity, optical gain, etc. of the reflective coatings prepared by the coatings involved in related technologies. Summary of the Invention

[0005] In view of this, the present invention provides a coating for preparing a reflective coating and its application, which can solve the technical problems existing in related technologies. Specifically, the following technical solutions are included:

[0006] On the one hand, a coating for preparing a reflective coating is provided. The coating includes the following components in parts by weight: 5 parts - 40 parts of a film-forming resin, 0.5 parts - 10 parts of a curing agent, 5 parts - 20 parts of a metal reflective material slurry, 0.2 parts - 5 parts of a light-absorbing material, 0.1 parts - 5 parts of an additive, and 50 parts - 90 parts of a solvent; wherein, the film-forming resin includes a thermoplastic acrylic resin and a thermosetting hydroxyl acrylic resin, the molecular weight of the thermoplastic acrylic resin is greater than 30000 g / mol, and the hydroxyl value range of the thermosetting hydroxyl acrylic resin is 15 mgKOH / g - 50 mgKOH / g.

[0007] In some possible implementation manners, the mass ratio of the thermoplastic acrylic resin to the thermosetting hydroxyl acrylic resin is 2 - 4:1.

[0008] In some possible implementation manners, the evaporation rate multiple of the solvent relative to butyl acetate is 0.5 - 5.

[0009] In some possible implementation manners, the solvent is at least two of ethyl acetate, butyl acetate, isobutyl acetate, sec-butyl acetate, ethylene glycol monomethyl ether acetate, butanone, cyclohexanone, methyl isobutyl ketone, diisobutyl ketone, ethylene glycol butyl ether, and ethylene glycol monomethyl ether.

[0010] In some possible implementations, the metal reflective material slurry is aluminum silver paste, zinc paste or aluminum magnesium paste.

[0011] In some possible implementations, the particle size range of the metal reflective material contained in the metal reflective material slurry is 5 μm - 15 μm.

[0012] In some possible implementations, the light-absorbing material is carbon black with a particle size less than or equal to 5 μm.

[0013] In some possible implementations, the auxiliary agent is selected from at least one of a dispersant, a leveling agent, an antioxidant, and a viscosity regulator.

[0014] On the other hand, provided is an application of any one of the above coatings for preparing a reflective coating in the preparation of a projection screen.

[0015] On yet another hand, provided is a projection screen, which includes a Fresnel base film, a reflective coating, a PUR glue layer, and a non-woven fabric that are stacked in sequence, wherein the reflective coating is prepared by using any one of the above coatings.

[0016] The beneficial effects of the technical solutions provided by the embodiments of the present invention at least include:

[0017] For the coating for preparing a reflective coating provided by the embodiments of the present invention, its film-forming resin adopts a combination of a thermoplastic acrylic resin and a thermosetting hydroxyl acrylic resin. Among them, the thermoplastic acrylic resin is more beneficial to the arrangement effect of the metal reflective material powder in the metal reflective material slurry, so that the reflection effect of the reflective coating prepared by the coating is improved, and the optical gain is enhanced. The thermosetting hydroxyl acrylic resin has good curing and cross-linking characteristics, so as to ensure the fixing property of the metal reflective material powder in the reflective coating and ensure the service life of the reflective coating. On this basis, the film-forming resin, the light-absorbing material, the auxiliary agent, and the solvent act synergistically in a specific ratio, which is beneficial to improving the reflectivity and optical gain of the reflective coating. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained according to these drawings.

[0019] Figure 1 It is a schematic structural diagram of an exemplary projection screen provided by an embodiment of the present invention.

[0020] The reference numerals respectively represent:

[0021] 100, Fresnel base film; 200, reflective coating; 300, PUR adhesive layer; 400, non-woven fabric. Detailed implementation

[0022] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0023] Regarding the problem that there is still a need for improvement in aspects such as reflected light intensity, brightness gain, and absorption of ambient light when the reflective coating prepared by the paint involved in the related technology is applied to the projection screen, the embodiments of the present invention provide a paint with an improved formula to solve the above technical problems.

[0024] On the one hand, the embodiments of the present invention provide a paint for preparing a reflective coating, and the paint includes the following components in parts by weight: 5 parts - 40 parts of film-forming resin, 0.5 parts - 10 parts of curing agent, 5 parts - 20 parts of metal reflective material slurry, 0.2 parts - 5 parts of light-absorbing material, 0.1 parts - 5 parts of auxiliary agent, and 50 parts - 90 parts of solvent. Among them, the film-forming resin includes thermoplastic acrylic resin and thermosetting hydroxyl acrylic resin.

[0025] Exemplarily, the parts by weight of the film-forming resin include but are not limited to any one of the following values or the range of intervals formed by any two of them: 5 parts, 6 parts, 7 parts, 8 parts, 9 parts, 10 parts, 11 parts, 12 parts, 13 parts, 14 parts, 15 parts, 16 parts, 17 parts, 18 parts, 19 parts, 20 parts, 21 parts, 22 parts, 23 parts, 24 parts, 25 parts, 26 parts, 27 parts, 28 parts, 29 parts, 30 parts, 31 parts, 32 parts, 33 parts, 34 parts, 35 parts, 36 parts, 37 parts, 38 parts, 39 parts, 40 parts, etc. Further, the parts by weight of the film-forming resin can be 10 parts - 30 parts.

[0026] Exemplarily, the parts by weight of the curing agent include but are not limited to any one of the following values or the range of intervals formed by any two of them: 0.5 parts, 0.6 parts, 0.7 parts, 0.8 parts, 0.9 parts, 1 part, 1.5 parts, 2 parts, 2.5 parts, 3 parts, 3.5 parts, 4 parts, 4.5 parts, 5 parts, 5.5 parts, 6 parts, 6.5 parts, 7 parts, 7.5 parts, 8 parts, 8.5 parts, 9 parts, 9.5 parts, 10 parts, etc.

[0027] Exemplarily, the parts by weight of the metal reflective material slurry include but are not limited to any one of the following values or the range formed by any two of them: 5 parts, 6 parts, 7 parts, 8 parts, 9 parts, 10 parts, 11 parts, 12 parts, 13 parts, 14 parts, 15 parts, 16 parts, 17 parts, 18 parts, 19 parts, 20 parts, etc. And, the solid content of the metal reflective material slurry includes but is not limited to the following: 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, etc.

[0028] Exemplarily, the parts by weight of the light-absorbing material include but are not limited to any one of the following values or the range formed by any two of them: 0.2 parts, 0.3 parts, 0.4 parts, 0.5 parts, 0.6 parts, 0.7 parts, 0.8 parts, 0.9 parts, 1 part, 1.5 parts, 2 parts, 2.5 parts, 3 parts, 3.5 parts, 4 parts, 4.5 parts, 5 parts, etc.

[0029] Exemplarily, the parts by weight of the auxiliary agent include but are not limited to any one of the following values or the range formed by any two of them: 0.1 parts, 0.2 parts, 0.3 parts, 0.4 parts, 0.5 parts, 0.6 parts, 0.7 parts, 0.8 parts, 0.9 parts, 1 part, 1.5 parts, 2 parts, 2.5 parts, 3 parts, 3.5 parts, 4 parts, 4.5 parts, 5 parts, etc.

[0030] Exemplarily, the parts by weight of the solvent include but are not limited to any one of the following values or the range formed by any two of them: 50 parts, 55 parts, 60 parts, 65 parts, 70 parts, 75 parts, 80 parts, 85 parts, 90 parts, etc.

[0031] The coating for preparing a reflective coating provided by the embodiment of the present invention uses a combination of a thermoplastic acrylic resin and a thermosetting hydroxyl acrylic resin as the film-forming resin. Among them, the thermoplastic acrylic resin is more beneficial to the arrangement effect of the metal reflective material powder in the metal reflective material slurry, so that the reflection effect of the reflective coating prepared by the coating improves the optical gain. The thermosetting hydroxyl acrylic resin has good curing and crosslinking characteristics, so as to ensure the fixing property of the metal reflective material powder in the reflective coating and ensure the service life of the reflective coating. On this basis, the film-forming resin, the light-absorbing material, the auxiliary agent and the solvent act synergistically in a specific ratio, which is beneficial to improving the reflectivity and optical gain of the reflective coating.

[0032] For the film-forming resin, the mass ratio of the thermoplastic acrylic resin to the thermosetting hydroxy acrylic resin contained therein is 2-4:1. For example, this includes but is not limited to the following: 2:1, 2.5:1, 3:1, 3.5:1, 4:1, etc. This is because if the content of the thermoplastic acrylic resin is too high, it will cause insufficient adhesion of the metal reflective material powder, such as aluminum silver powder, and insufficient adhesion between the subsequent lamination process and the non-woven fabric. If the content of the thermosetting hydroxypropyl resin is too high, it will cause poor arrangement of the metal reflective material powder, low reflectivity, and poor optical gain. Therefore, through the above mixing ratio scheme, it is ensured that the reflective coating has good reflectivity (i.e., reflected light intensity), adhesion of aluminum silver powder, and flexibility.

[0033] It should be noted that the above-mentioned aluminum silver powder is actually aluminum powder, which is used to form aluminum silver paste (also known as silver paste). Aluminum silver powder has a low cost and good metallic luster, can reflect light, and presents a bright effect similar to silver. Through special processing techniques, such as making the aluminum silver powder into a flaky structure and performing surface treatment, it can form a closely arranged reflective layer in the coating, producing a luster and texture similar to silver. Therefore, its slurry is usually called aluminum silver paste.

[0034] Taking the metal reflective material powder as aluminum silver powder as an example, the thermoplastic acrylic resin can improve the arrangement effect of aluminum silver powder in the reflective coating. This is because the thermoplastic acrylic resin usually has a low viscosity and good fluidity, and can form a uniform coating layer on the surface of the aluminum silver powder, making the aluminum silver powder more easily affected by shear force and surface tension during the coating construction process and orienting. At the same time, this fluidity helps the aluminum silver powder move freely and adjust its position in the paint film, reducing the phenomenon of agglomeration and disorderly arrangement. Moreover, the thermoplastic acrylic resin also has good film-forming properties, so it can quickly form a preliminarily cured paint film, fixing the aluminum silver powder in a specific position, which is conducive to the formation of a regular arrangement of aluminum silver powder.

[0035] The thermoplastic acrylic resin with a larger molecular weight has a higher viscosity and appropriate rheology, which is more beneficial to ensuring the arrangement effect of aluminum silver powder and is also conducive to improving the flexibility of the reflective coating. In the embodiments of the present invention, it is desired that the molecular weight of the thermoplastic acrylic resin is greater than 30000 g / mol.

[0036] Some examples of the thermoplastic acrylic resin applicable to the embodiments of the present invention can be as follows: AR70033, AR70004, AR70015 of Haohui New Materials; MA-2511, 300-120, AFC-8615 of Aofan Chemical; 6584N-1, DR-A835, DR-840, DR-A845, DR-A870, DR-A872 of Changxing Chemical; Jiashengda AAR-2200M-50, Jiashengda AAR-2203-50, Jiashengda AAR-2212-50, etc.

[0037] In the embodiments of the present invention, the synthesis monomers of the thermosetting hydroxy acrylic resin can be acrylate monomers such as methyl acrylate, ethyl acrylate, butyl acrylate, etc., or methacrylate monomers such as methyl methacrylate, ethyl methacrylate, etc., and can also be hydroxyethyl acrylate and hydroxypropyl acrylate monomers.

[0038] To ensure the curing and crosslinking effect and improve the fixing property of the metal reflective material powder, the hydroxyl value range of the thermosetting hydroxy acrylic resin can be 15mgKOH / g - 50mgKOH / g, for example, 15mgKOH / g - 25mgKOH / g, 15mgKOH / g - 35mgKOH / g, 15mgKOH / g - 45mgKOH / g, 20mgKOH / g - 50mgKOH / g, 30mgKOH / g - 50mgKOH / g, etc. At the same time, this also helps the reflective coating to have strong adhesion and flexibility.

[0039] Some examples of the thermosetting hydroxy acrylic resin applicable to the embodiments of the present invention can be as follows: AR70012, AR70021, AR70022, AR70023 of Haohui New Materials; 830B of Aofan Chemical; DA204C, DA211A, 7038 of Dachang Resin, etc.

[0040] According to the types of the thermoplastic acrylic resin and the thermosetting hydroxy acrylic resin involved above, a suitable curing agent is selected. Among them, the weight portion of the curing agent is 0.5 portion - 10 portions, and further can be 0.5 portion - 7 portions. If the addition amount of the curing agent is too small, the reaction of the thermosetting hydroxy acrylic resin will be incomplete and the fixing property of the aluminum silver powder will be poor. If the addition amount of the curing agent is too large, the brittleness of the coating will increase and the curtain will crack.

[0041] In some examples, the curing agent is an isocyanate curing agent, which includes but is not limited to at least one of MDI, HDI, TDI, and IPDI.

[0042] Some examples of the curing agents applicable to the embodiments of the present invention can be as follows: VK5, VK10, E14, E15, E21, E29, N100, N3200, N3400, N3600, N3800, B1358A, etc. from Haoyi Chemical Industry.

[0043] The embodiments of the present invention use 50 parts - 90 parts of a solvent. Further, the weight parts of the solvent can be 60 parts - 85 parts. This is because, if the addition amount of the solvent is too much, it will cause insufficient drying of the coating, an extended construction time, and the residual solvent will affect the lamination effect during the subsequent lamination process. If the addition amount of the solvent is too little, the viscosity of the paint will be too high and it cannot be constructed.

[0044] In some examples, a composite solvent can be used, and the composite solvent is selected from the mixture of one or a variety of esters, ketones, and ethers.

[0045] For the above various solvents, it can be further defined that the volatility rate multiple of the solvent relative to butyl acetate is 0.5 - 5. Further, the volatility rate multiple of the solvent relative to butyl acetate is 0.5 - 4.

[0046] Among them, the volatility rate is an index to measure the speed of the solvent changing from a liquid state to a gaseous state. Here, butyl acetate is used as a reference standard. For example, when the volatility rate multiple of the solvent relative to butyl acetate is 2, it means that under the same conditions, such as the same temperature, humidity, ventilation and other environmental conditions, the time required for the solvent to volatilize completely is half of the time required for butyl acetate to volatilize completely, that is, its volatility speed is twice as fast as that of butyl acetate.

[0047] The reason for the above limitation on the volatility rate of the solvent is as follows: If the solvent volatilizes too slowly, it will cause insufficient drying of the coating, an extended construction time, and the residual solvent will affect the lamination effect during the subsequent lamination process. If the solvent volatilizes too quickly, it will cause insufficient leveling time of the aluminum silver powder, deteriorate the reflectivity, and reduce the optical gain.

[0048] In some examples, the solvent is at least two of ethyl acetate, butyl acetate, isobutyl acetate, sec-butyl acetate, ethylene glycol monomethyl ether acetate, butanone, cyclohexanone, methyl isobutyl ketone, diisobutyl ketone, ethylene glycol butyl ether, and ethylene glycol monomethyl ether.

[0049] In the embodiments of the present invention, the metal reflective material slurry used is aluminum silver paste, silver paste, copper paste, zinc paste or aluminum magnesium paste. The above types of slurries are usually used for the preparation of projection screens.

[0050] The metal reflective material slurry includes metal powder, solvent and additives. Among them, the solid content of the metal reflective material slurry is 5%-70%, and this solid content refers to the mass percentage of the metal powder and solid additives therein. The addition amount of the metal reflective material slurry can be 5-20 parts, and further can be 5-15 parts.

[0051] Taking aluminum silver paste as an example, it includes aluminum silver powder, solvent and additives. The cost of aluminum silver powder is relatively low, and it has good metallic luster, can reflect light, and presents a bright effect similar to silver. Through special processing techniques, such as making the aluminum silver powder into a flaky structure and performing surface treatment, it can form a closely arranged reflective layer in the coating, producing a luster and texture similar to silver. Therefore, its slurry is usually called aluminum silver paste.

[0052] In some examples, the particle size range of the metal reflective material contained in the metal reflective material slurry is 5μm-15μm. If the particle size is too large, it will lead to poor reflectivity of the reflective coating. Through the above particle size scheme, it is ensured that the reflective coating has good optical gain.

[0053] Taking the metal reflective material slurry as aluminum silver paste as an example, some examples of aluminum silver paste applicable to the embodiments of the present invention can be as follows: ZP10262, ZP10742, ZP10198, ZP10660, ZP10778, ZP10692, ZP10349 of Eckart Chemical; D710, TS-408PM, TS-710PM, Z485, Z475, Z465, Z440, Z460, CF-290N, etc. of Toyo Aluminum Industry.

[0054] The embodiments of the present invention use carbon black as the light-absorbing material. Carbon black can also absorb light in a very wide wavelength range and has a high light absorption coefficient, thereby reducing the reflection and scattering of light on the surface of the curtain and improving the contrast of the projection image.

[0055] In some examples, the weight part of carbon black can be further less than or equal to 3 parts, and the particle size of carbon black is less than or equal to 5μm, so as to ensure an increase in the specific surface area of carbon black, making it have more light absorption sites and improving the light absorption effect.

[0056] For example, Cabot carbon black M1400 can be used as the light-absorbing material. In order to ensure that the particle size of carbon black is as small as possible, it can be processed through the following dispersion and grinding process: Put carbon black, the additives involved in the coating, film-forming resin and a small amount of solvent into the material cylinder, and disperse for 30 minutes at 800r / min-1000r / min. Then place it in a bead mill for grinding treatment until the particle size of carbon black is less than 5μm, and then filter it with a 5μm filter bag.

[0057] The additives applicable to the coatings involved in the embodiments of the present invention can be selected from at least one of dispersants, leveling agents, antioxidants, and viscosity regulators.

[0058] Among them, the dispersant is used to improve the dispersibility of each component in the coating, especially to prevent the agglomeration of metal powders and ensure the uniform reflectivity of the coating. The leveling agent helps the coating to automatically level when coated on the surface of the curtain, forming a smooth and flat coating, avoiding defects such as orange peel and ripples, and improving the appearance quality and reflection effect of the curtain. The antioxidant can prevent the metal powder from undergoing oxidation reactions during the use of the coating or the curtain, thereby reducing the reflectivity. The viscosity regulator is used to adjust the viscosity of the coating to make it have appropriate fluidity and coatability during the construction process.

[0059] Some examples of the additives applicable to the embodiments of the present invention can be as follows: at least one of BYK 333, BYK 306, BYKUV3505, TEGO 450, TEGO 410, TEGO 432, and TEGO 110.

[0060] For any of the above-mentioned coatings, when each component in the coating further meets the defined preferred implementation conditions, the metal powder, such as the arrangement effect of aluminum silver powder, can be obtained. Based on the projection screen with this reflective coating, after testing, its reflection brightness gain > 1.6, and the light resistance is greater than 85%, significantly improving the picture effect of the laser TV.

[0061] For any of the above-mentioned coatings, it can be prepared by the following method: Mix the film-forming resin, light-absorbing material, additives, and part of the solvent evenly, grind it to less than 5 μm (refer to the above-mentioned carbon black grinding scheme), add the remaining solvent and the metal reflective material slurry after cooling, stir evenly, and then filter with a 300-mesh filter cloth to obtain the coating ready for use. The curing agent is added and stirred evenly before the coating is applied. Among them, the stirring speed and stirring time for the above-mentioned stirring and construction should ensure that each component is mixed evenly. For example, the stirring speed can be 500 rpm - 2000 rpm, and the stirring time can be 30 min - 120 min.

[0062] On the other hand, the embodiments of the present invention also provide the application of any of the above-mentioned coatings for preparing a reflective coating in the preparation of a projection screen.

[0063] As shown in the appendix Figure 1 The embodiments of the present invention provide a projection screen, which includes a Fresnel base film 100, a reflective coating 200, a PUR adhesive layer 300, and a non-woven fabric 400 stacked in sequence. Among them, the reflective coating 200 is prepared by using any of the above-mentioned coatings.

[0064] This projection screen is based on a reflective coating 200 prepared using the coating provided in the embodiments of the present invention. On the basis of having strong reflectivity and optical gain, the reflective coating 200 also has strong adhesion and flexibility, which enables the projection screen to have all the effects of the reflective coating, thereby effectively improving its projection effect.

[0065] Exemplary embodiments of the present invention will be described in more detail below. Although the exemplary embodiments of the present invention are described below, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. For those not specified in the examples regarding specific technologies or conditions, they shall be in accordance with the technologies or conditions described in the literature in the art or in accordance with the product specifications. For those reagents or instruments whose manufacturers are not specified, they are all conventional products that can be obtained through commercial purchase.

[0066] Examples 1 - 13 and Comparative Examples 1 - 4 are provided. The formulations of these coatings can be seen in the following, and some of the raw material information involved is as follows.

[0067] Composite solvent A: A composite solvent of butyl acetate, ethyl acetate, ethylene glycol methyl ether acetate, and cyclohexanone, and its relative evaporation rate to butyl acetate is 2.5.

[0068] Composite solvent B: A composite solvent of butyl acetate, sec - butyl acetate, ethylene glycol butyl ether, and diisobutyl ketone, and its relative evaporation rate to butyl acetate is 0.8.

[0069] Composite solvent C: A composite solvent of sec - butyl acetate, ethylene glycol methyl ether acetate, diisobutyl ketone, and ethylene glycol butyl ether, and its relative evaporation rate to butyl acetate is 0.3.

[0070] Composite solvent D: A composite solvent of ethyl acetate, sec - butyl acetate, and butanone, and its relative evaporation rate to butyl acetate is 5.2.

[0071] The thermoplastic acrylic resins are respectively: AR70033 of Haohui New Materials, with a molecular weight of 35000 g / mol; AAR - 2203 - 50 of Jiashengda, with a molecular weight of 42000 g / mol; 3167 - 5A of Guojing Chemistry, with a molecular weight of 13700 g / mol.

[0072] The thermosetting hydroxy - acrylic resins are respectively: AR70012 of Haohui New Materials, with a hydroxyl value of 17.5 mgKOH / g; AR70023 of Haohui New Materials, with a hydroxyl value of 30 mgKOH / g; PAR - 1613B - 50 of Jiashengda, with a hydroxyl value of 2.28 mgKOH / g; PAR - 1569 - 80 of Jiashengda, with a hydroxyl value of 120 mgKOH / g.

[0073] The curing agents are VK5 and E21 from Haoyi Chemical Industry.

[0074] The aluminum silver pastes are D710 from Toyo Aluminum Industry with a particle size of 10μm, TS-408PM from Toyo Aluminum Industry with a particle size of 7μm, Z440 from Toyo Aluminum Industry with a particle size of 14μm, and CFR110N with a particle size of 20μm.

[0075] The light-absorbing material is Cabot carbon black M1400 with a particle size less than 5μm.

[0076] The additives are BYK 306 and BYK UV3505.

[0077] Based on the above-mentioned various coatings, the preparation of the projection screen is carried out, and the preparation process is as follows: After mixing the components in the coating evenly according to their preparation methods, it is coated on the front of the Fresnel screen, and then placed in an oven and baked at 80°C for 1 hour to form a reflective coating. Then, the PUR glue melted by baking at 150°C is coated on the reflective coating, and then the black non-woven fabric is bonded to the PUR glue to prepare the projection screen.

[0078] Performance tests are carried out on the above-mentioned various projection screens, and the relevant performance test methods and evaluation criteria are as follows:

[0079] (1) Adhesion: Cut the projection screen into strips with a width of 1 inch, and conduct the adhesion test between the reflective coating and the non-woven fabric. Specifically, use a tensile tester to test the 90° peel strength. Among them, a peel strength greater than 10N is excellent.

[0080] (2) Optical gain: Test the brightness of the laser TV projection on the center point of the projection screen (brightness 1), and then test the brightness of the reflected light at the center point 2m away from the projection screen (brightness 2). Brightness 2 / brightness 1 is the optical gain, that is, the brightness gain. Among them, a gain greater than 1.8 is excellent.

[0081] (3) Light resistance: Turn off the laser TV, and under normal fluorescent lamp conditions, test the brightness of the center point of the projection screen (brightness 3), and then test the brightness of the reflected light at the center point 2m away from the screen (brightness 4). (1 - brightness 4) / brightness 3 is the light resistance. Among them, a light resistance greater than 88% is excellent.

[0082] (4) Flexibility: Roll up the projection screen into a reel with a diameter of 20cm, and observe the cracking situation of the reflective coating from the back of the projection screen. Completely no cracking is excellent, having cracks is good, and having cracks and paint film falling off is poor.

[0083] The relevant data obtained from the tests can be seen in the following relevant tables.

[0084] Table 1

[0085]

[0086] Table 2

[0087]

[0088] As can be seen from Table 1 and Table 2, by comparing Examples 1-4 with Comparative Examples 1-4, it can be known that within the range of the weight parts defined for the film-forming resin, solvent, aluminum silver paste, light-absorbing material, auxiliary agent, etc., the optical gain and light resistance of the prepared projection screen are relatively excellent, and at the same time, it has good adhesion and flexibility.

[0089] Table 3

[0090] Example 3 Comparative Example 5 Comparative Example 6 Comparative Example 7 AR70033 20 / 20 20 3167-5A / 20 / / AR70012 7 7 / / PAR-1613B-50 / / 7 / PAR-1569-80 / / / 7 VK5 3 3 3 3 Composite Solvent A 74 74 74 74 TS-408PM 10 10 10 10 M1400 2 2 2 2 BYK333 0.2 0.2 0.2 0.2

[0091] Table 4

[0092]

[0093] As can be seen from Table 3 and Table 4, when the molecular weight of the thermoplastic acrylate and the hydroxyl value of the thermosetting acrylate resin are both within their respective desired preferred ranges, it can ensure that the gain and light resistance of the projection screen are improved at the same time, and it is also beneficial to obtain greater adhesion and flexibility.

[0094] Table 5

[0095] Raw Materials Example 4 Comparative Example 8 Comparative Example 9 AAR-2203-50 18 18 18 AR70023 6 6 6 E21 5 5 5 Composite Solvent B 62 / / Composite Solvent C / 62 / Composite Solvent D / / 62 D710 8 8 8 M1400 2 2 2 BYK3505 0.2 0.2 0.2

[0096] Table 6

[0097]

[0098] As can be seen from Table 5 and Table 6, when the composite solvent volatilizes too slowly, since the solvent cannot volatilize completely, the adhesion will be greatly reduced. When the solvent volatilizes too fast, the silver powder does not have time to level, resulting in a far insufficient gain.

[0099] Table 7

[0100] Example 3 Example 5 Example 6 AR70033 20 14 23 AR70012 8 14 5 VK5 3 3 3 Composite Solvent A 74 74 74 TS-408PM 10 10 10 M1400 2 2 2 BYK333 0.2 0.2 0.2

[0101] Table 8

[0102]

[0103] As can be seen from Table 7 and Table 8, when the ratio of the thermoplastic acrylic resin to the thermosetting hydroxyl acrylic ester resin is between 2:1 and 4:1, the reflective coating has excellent comprehensive properties.

[0104] Table 9

[0105] Raw Materials Example 3 Example 7 Example 8 AR70033 20 20 20 AR70012 7 7 7 VK5 3 3 3 Composite Solvent A 74 74 74 TS-408PM 10 / / Z440 / 10 / CFR110N / / 10 M1400 2 2 2 BYK333 0.2 0.2 0.2

[0106] Table 10

[0107]

[0108] As can be seen from Table 9 and Table 10, the coarser the particle size of the aluminum silver powder, the worse the optical gain. When the particle size exceeds 15 microns, the optical gain will deteriorate.

[0109] The above description is only for the convenience of those skilled in the art to understand the technical solution of the present invention, and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A coating for preparing a reflective coating, characterized in that, The coating material comprises the following components in parts by weight: 5 - 40 parts of film-forming resin, 0.5 - 10 parts of curing agent, 5 - 20 parts of metal reflective material slurry, 0.2 - 5 parts of light-absorbing material, 0.1 - 5 parts of auxiliary agent, and 50 - 90 parts of solvent; Among them, the film-forming resin includes thermoplastic acrylic resin and thermosetting hydroxyl acrylic resin. The molecular weight of the thermoplastic acrylic resin is greater than 30,000 g / mol, and the hydroxyl value range of the thermosetting hydroxyl acrylic resin is 15 mgKOH / g - 50 mgKOH / g.

2. The coating according to claim 1, characterized in that, The mass ratio of the thermoplastic acrylic resin to the thermosetting hydroxyl acrylic resin is 2 - 4:

1.

3. The coating according to claim 1, characterized in that, The volatility rate multiple of the solvent relative to butyl acetate is 0.5 - 5.

4. The coating according to claim 3, characterized in that, The solvent is at least two of ethyl acetate, butyl acetate, isobutyl acetate, sec-butyl acetate, ethylene glycol monomethyl ether acetate, butanone, cyclohexanone, methyl isobutyl ketone, diisobutyl ketone, ethylene glycol butyl ether, and ethylene glycol monomethyl ether.

5. The coating according to claim 1, characterized in that, The metal reflective material slurry is aluminum silver paste, zinc paste, or aluminum magnesium paste.

6. The coating according to claim 5, wherein The particle size range of the metal reflective material contained in the metal reflective material slurry is 5 μm - 15 μm.

7. The coating according to any one of claims 1-6, characterized in that, The light-absorbing material is carbon black with a particle size less than or equal to 5 μm.

8. The coating according to any one of claims 1-7, characterized in that, The auxiliary agent is selected from at least one of dispersant, leveling agent, antioxidant, and viscosity regulator.

9. Application of the coating material for preparing a reflective coating according to any one of claims 1 - 8 in the preparation of a projection screen.

10. A projection screen, characterized in that, The projection screen includes a Fresnel base film, a reflective coating, a PUR adhesive layer, and a non-woven fabric laminated in sequence. Among them, the reflective coating is prepared from the coating material according to any one of claims 1 - 8.

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