WO2022048064A1 - Pvc银幕用自干型水性铝粉涂料及其制备方法与应用 - Google Patents

Pvc银幕用自干型水性铝粉涂料及其制备方法与应用 Download PDF

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WO2022048064A1
WO2022048064A1 PCT/CN2020/136223 CN2020136223W WO2022048064A1 WO 2022048064 A1 WO2022048064 A1 WO 2022048064A1 CN 2020136223 W CN2020136223 W CN 2020136223W WO 2022048064 A1 WO2022048064 A1 WO 2022048064A1
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water
aluminum powder
self
pvc
drying
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English (en)
French (fr)
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张涛
花魁昌
汪小峰
徐宏
赵奔
王全
欧阳旭频
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苏州市贝特利高分子材料股份有限公司
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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
    • C09D175/04—Polyurethanes
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
    • C08J7/04—Coating
    • C08J7/0427—Coating with only one layer of a composition containing a polymer binder
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
    • C09D5/38—Paints containing free metal not provided for above in groups C09D5/00 - C09D5/36
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
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    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2327/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers
    • C08J2327/02—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers not modified by chemical after-treatment
    • C08J2327/04—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers not modified by chemical after-treatment containing chlorine atoms
    • C08J2327/06—Homopolymers or copolymers of vinyl chloride
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2433/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers
    • C08J2433/04—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers esters
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2467/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
    • C08J2467/08—Polyesters modified with higher fatty oils or their acids, or with resins or resin acids
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2475/00—Characterised by the use of polyureas or polyurethanes; Derivatives of such polymers
    • C08J2475/04—Polyurethanes
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/02—Elements
    • C08K3/08—Metals
    • C08K2003/0812—Aluminium
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K2201/00—Specific properties of additives
    • C08K2201/002—Physical properties
    • C08K2201/003—Additives being defined by their diameter
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K2201/00—Specific properties of additives
    • C08K2201/014—Additives containing two or more different additives of the same subgroup in C08K
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
    • C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
    • C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend

Definitions

  • the invention belongs to the coating technology, and particularly relates to a self-drying water-based aluminum powder coating for PVC screen and a preparation method and application thereof.
  • the coatings used for PVC screen coating are oil-based. It is mixed with one or more of different self-drying acrylic or alkyd resins, and then mixed with aluminum powder in an appropriate ratio to meet the performance requirements.
  • the main components are silver paint and organic solvent, and the mixing ratio of paint is 100:80-100.
  • the solid content is low and the organic solvent content is high.
  • the existing PVC screen coatings have several shortcomings and deficiencies: 1. Due to the use of oil-based coatings, the storage site must be a special warehouse for dangerous goods, which increases the storage cost and has potential safety hazards; 2. Oil-based coatings must use a lot of The quick-drying solvent not only has a strong odor, but also can easily be breathed into the body by the construction workers or stimulate the exposed skin to cause health effects; 3Due to the use of a large amount of organic solvents to dilute the oil-based paint during construction, and the paint itself contains a large amount of organic solvents, it is difficult to It is inevitable to volatilize into the environment after construction, causing environmental pollution; 4 The dilution of oil-based paint requires the use of organic solvents, which increases the cost; During the process, the solvent is constantly volatilized, which has a certain impact on the comfort of the moviegoers; 6 The main film-forming resin used in the oil-based paint is prone to yellowing, and the surface of the aluminum powder is easily oxidized.
  • the layer will turn yellow and black, and the performance indicators (gain brightness, scattering angle, polarization contrast) will gradually decline and decrease, and both comfort and 3D effect will be greatly affected during projection. 7After the water-based screen coating of floating aluminum powder is self-drying, the aluminum powder on the coating is easy to be touched off, and the phenomenon of blackening occurs. , the polarization contrast is easily weakened, which greatly reduces the use time of the screen.
  • the invention uses water-based paint instead of oil-based paint, uses water as a solvent, reduces cost, is safe and environmentally friendly, and greatly reduces environmental pollution and the health of construction workers; Resins with lower film forming temperatures do not require additional high-boiling co-solvents, reducing VOC emissions.
  • the present invention adopts following technical scheme:
  • Self-drying water-based aluminum powder coating for PVC screen including water-based resin, water-based aluminum powder, water-based additives and water, wherein the mass percentage of water-based resin is 50-60%, the mass percentage of water-based aluminum powder is 20-25%, and the water-based The adjuvant is 5-15%, and the balance is water.
  • the water-based additives include water-based dispersant, water-based leveling agent, water-based defoamer, water-based anti-settling agent, and water-based wax slurry; preferably, water-based dispersant, water-based leveling agent, water-based defoamer,
  • the weight ratio of the agent and the aqueous wax slurry is (0.5-2): (1-2): (0.2-0.5): (1-4): (3-6).
  • the water-based resin used in the present invention is one or more of water-based anionic aliphatic polyurethane, water-based polycarbon polyurethane, water-based acrylic resin, and water-based alkyd resin, and the volatile content is far less than the national environmental protection paint VOC emission standard, which meets the environmental protection requirements;
  • the water-based resin has good film-forming performance, and does not need to add a high-boiling point film-forming co-solvent to form a film, thereby avoiding the use amount of the co-solvent.
  • the self-drying water-based aluminum powder coating for PVC screens of the present invention does not contain a co-solvent; Compared with water-based epoxy resin, water-based hydroxy acrylic acid, etc., the water-based resin defined in the present invention has better self-drying properties.
  • the surface dry is generally 30-60 minutes, and it can be left for 8 hours at room temperature after hard drying, which meets the requirements of spraying construction conditions on the current market. ;
  • the elongation at break of the dry film of the water-based aluminum powder coating prepared by combining with other components is 150-250%, which has a good stretching effect.
  • the surface is broken, which is convenient for the manufacturer to package, transport and install the finished PVC screen; it has strong adhesion to the substrate, and when the coating is completely dry, it is completely attached to the PVC substrate, and will not fall off after long-term use.
  • the phenomenon of insufficient wrapping with aluminum powder; different types of water-based resins have different effects on performance indicators gain brightness, scattering angle, and polarization contrast.
  • water-based anionic aliphatic polyurethane, water-based polycarbon polyurethane, water-based acrylic resin The weight ratio of the alkyd resin is (40-100): (5-10): (2-5): (10-20), and the obtained tensile strength reaches a balance with the performance index required for projection. The tensile strength meets the needs of the finished screen.
  • the dry film of the water-based aluminum powder coating disclosed by the invention has good transparency, water resistance, weather resistance and yellowing resistance, and the coating can be washed with water or detergent after long-term use, and there is no need to worry about the corrosion of water or the air.
  • the humidity of the aluminum powder has an impact on its weather resistance and yellowing; among them, the aluminum powder is better wetting and dispersing, so that each piece of aluminum powder can be fully wetted with deionized water, preventing aluminum powder caused by insufficient wetting.
  • the aluminum powder of the present invention has good wetting and dispersing, and the aluminum powder in the screen finished product is The powder is arranged evenly and has a superimposed layering. At this time, the test performance value is good, and the performance value difference between different parts of the screen is the smallest. On the contrary, if the wetting and dispersion of the aluminum powder is not enough, the arrangement of the aluminum powder in the finished screen will be more chaotic, there is no regularity, and the performance the worse the value.
  • the coating of the present invention does not require dummy powder, which reduces the cost, and the obtained coating has a large polarization contrast due to the limitation of the formula, which solves the prejudice that the prior art needs to add a dummy powder to obtain a large polarization contrast;
  • the main solvent is water, which does not cause environmental pollution, is non-flammable and explosive, has very little residual organic solvent content after self-drying, is not easy to yellow, and solves the problem of oil-based paints in the prior art.
  • the aqueous dispersant used in the present invention is one or more of BYK-192, BYK-190, and AQ-330; the water-washing leveling agent is one or more of BYK-346, Tego 270, Tego KH 245, and WE 2011.
  • water-based defoamer is one or more of BYK-028, BYK-022, Tego810, DAPRO DF 677; water-based anti-settling agent is one or more of AQ-633E, RHEOLATE 299, VEsmody U505 ;
  • Water-based wax slurry is one or more of AQUATIX 8421, E-8046S and LUBA-print 725.
  • the soft perforated PVC material used in the screen itself is difficult to wet, especially around the PVC holes.
  • the coating spreads more evenly on the surface of the PVC material, without exposing the PVC material.
  • the performance value of the PVC material itself is very poor, especially the polarization contrast is only below 20, so the better the coating wets the PVC material, the less exposed the PVC material substrate. , the smaller the difference in performance values in different parts of the screen, the better the 3D uniform effect experienced by moviegoers.
  • the coating of the present invention does not produce micro-bubble defects in the coating film during and after construction; it is easy to emulsify to form a uniform distribution in a water-based system, and has good compatibility, avoiding whitening caused by incompatibility.
  • the aluminum powder is well dispersed into the coating to prevent the aluminum powder from settling or hard precipitation after being placed for a long time.
  • the aluminum powder is directionally arranged and has a better sense of hierarchy. People with strong visual effects, while also improving polarization contrast.
  • the particle size D50 of the water-based aluminum powder is 8 to 35 microns.
  • the aluminum powder is composed of large aluminum powder and small aluminum powder, wherein the particle size D50 of the large aluminum powder is 20 to 35 microns, and the size of the small aluminum powder is 20 to 35 microns.
  • the particle size D50 is 8 to 20 microns, and it is further preferred that the mass percentage of large aluminum powder is 30 to 40%, and the rest is small aluminum powder; when the aluminum powder is used in a reasonable proportion, it is not necessary to use dummy powder, reducing In order to reduce the cost, the obtained polarization contrast is the maximum value, and the use of combination can greatly improve the polarization contrast.
  • the water-based aluminum powder of the present invention can be one or more of CCWL8009, ZW1305, HYDROLAN-2154 and CCWH9324.
  • the preparation method of the above-mentioned self-drying water-based aluminum powder coating for PVC screens is as follows: adding water-based additives into water, adding water-based aluminum powder after stirring, adding water-based resin under stirring, and stirring to obtain self-drying water-based aluminum powder coatings for PVC screens .
  • a small amount of screen coatings in the prior art are made of water-based screen coatings made of floating aluminum powder. At present, this technology cannot be widely recognized by the market due to the shortcomings of aluminum powder removal and inability to be touched by hand.
  • the surface of the aluminum powder is oxidized slowly, and the polarization contrast of the performance index > 200 can be maintained for a long time; compared with the floating aluminum powder, it will not float on the surface of the coating, so the aluminum powder will not fall off after touching, and water It can be cleaned with detergent to improve the service life of the screen; the gain brightness of the coating is in the range of 2.2 to 3.0, which can meet the requirements of different screens and different projections with different gain brightness at the same time, which improves the breadth of product use, while scattering Angle > 40, also in line with national standards, polarization contrast > 200, far higher than the national minimum 3D movie projection standard of 80, the limit can achieve 3.0 gain brightness, polarization contrast 280 ⁇ 350.
  • the surface drying of the coating film is accelerated, and a better self-drying effect is achieved.
  • the water-based products do not use solvents, which reduces the emission to the environment and reduces the health damage to the construction workers.
  • Fig. 1 is the finished movie screen prepared by self-drying water-based aluminum powder coating for PVC screen of the present invention.
  • the present invention uses water as the raw material to replace the organic solvent in the prior art, which is safer and more environmentally friendly in both storage and construction, greatly reduces the impact on the environment and construction personnel, and does not affect the performance of the screen during projection.
  • the screen can be cleaned when it has dust or other pollutants after long-term use, and the oxidation of the surface of the aluminum powder is slower, and the polarization contrast decay is slow, which improves the use time of the screen; the residual organic solvent content in the screen is almost If it is 0, it will not cause odor problems; in addition, the water-based resin used is also resistant to yellowing. After the screen is used, the yellowing changes slowly, and the use time is longer than that of oily ones.
  • the self-drying water-based aluminum powder coating for PVC screen of the present invention is composed of water-based resin, water-based aluminum powder, water-based auxiliary agent and water, wherein the mass percentage of the water-based resin is 50-60%, and the mass percentage of the water-based aluminum powder is 20-25%. %, the water-based additives are 5-15%, and the rest is water.
  • the water-based resin is composed of water-based anionic aliphatic polyurethane, water-based polycarbon polyurethane, water-based acrylic resin, and water-based alkyd resin; water-based additives are composed of water-based dispersant, water-based leveling agent, water-based defoamer, water-based anti-settling agent, and water-based wax slurry.
  • composition preferably, the weight ratio of aqueous dispersant, aqueous leveling agent, aqueous defoamer, aqueous anti-settling agent and aqueous wax slurry is (0.5 ⁇ 2):(1 ⁇ 2):(0.2 ⁇ 0.5):( 1 to 4): (3 to 6).
  • the raw materials involved in the present invention are conventional commercially available raw materials in the field of coatings, and the specific preparation methods and testing methods involved are conventional methods for coatings.
  • the self-drying water-based aluminum powder coating for PVC screen (100 parts by weight) is composed of the raw materials in Table 1.
  • the water-based resin is composed of water-based anionic aliphatic polyurethane SP-3106, water-based polycarbon polyurethane PU3461, water-based acrylic resin Crysol 6319, water-based alcohol with a weight ratio of 75:10:5:10. Acid resin 6070 composition; in Comparative Example 1, the water-based resin is water-based anionic aliphatic polyurethane SP-3106.
  • the water-based aluminum powder is composed of large aluminum powder and small aluminum powder, wherein the particle size D50 of the large aluminum powder is 25-35 microns, and the particle size D50 of the small aluminum powder is 8- 15 microns, the mass percentage of large aluminum powder is 35%, and the rest is small aluminum powder; in Comparative Example 2, the particle size D50 of the water-based aluminum powder is all 8-15 microns.
  • the water-based dispersant is BYK-192; the wetting and leveling agent is BYK-346 and Tego 270 with a weight ratio of 1:1; the water-based defoamer is Tego810 and DAPRO DF 677 with a weight ratio of 1:1 ; Water-based anti-settling agent is AQ-633E; water-based wax slurry is LUBA-print 725.
  • the preparation method of the above-mentioned self-drying water-based aluminum powder coating for PVC screens is as follows: adding water-based additives into water, adding water-based aluminum powder after stirring, adding water-based resin under stirring, and stirring to obtain self-drying water-based aluminum powder coatings for PVC screens .
  • the above-mentioned water-based leveling agent, water-based anti-settling agent, and water-based wax slurry were added to water at a stirring rate of 1000 rpm, stirred for 15 minutes, and then added with a water-based defoamer and water-based dispersant, and stirred at a stirring speed of 1200 rpm for 5 minutes, Then add water-based aluminum powder, stir at 800 rpm for 15 minutes, then add water-based resin, and stir at 600 rpm for 30 minutes to obtain self-drying water-based aluminum powder coating for PVC screen.
  • the coating was coated on the surface of conventional porous PVC cloth, and the performance was tested according to the conventional test method after drying. The results are shown in Table 2.
  • the water-based resin in Comparative Example 1 was replaced with water-based epoxy resin WL-1104, and the rest remained unchanged.
  • the performance of the obtained coating decreased, the gain brightness was 2.0, and the polarization contrast was 167, which did not meet the use standard.
  • the same test was carried out using the existing conventional commercially available water-based aluminum powder coatings and oil-based aluminum powder coatings for screens.
  • the film thickness was also 35 microns, the gain brightness was 2.4 (water-based), 2.5 (oil-based), and the polarization contrast was 238 (water-based). ), 216 (oily).
  • Example 1 The coating of Example 1 was routinely coated on the surface of the existing PVC porous cloth (similar to the screen material), and after being completely dried and cured, as the experimental group, a total of 20 cloths of the same size were used;
  • the powder coating was coated with the existing PVC porous cloth by the same method, and after it was completely dried and cured, 20 cloths of the same size were used as the control group. Washing with a washing machine at the same time (adding washing powder according to the amount of cloth), rinsing the experimental group and the comparative example, do not spin dry, take out to dry naturally, leave it for 3 days after drying, repeat the same cleaning again, and repeat the cleaning five times. , and then perform the performance test.
  • the performance of the experimental group changed little and the performance change between 20 pieces of cloth was small, the gain brightness was 94-96% of that before washing, and the polarization contrast was 90-93% of that before washing; The performance changes greatly between the two, the gain brightness is 60-76% before washing, and the polarization contrast is 63-75% before washing.
  • the water-based resin is composed of water-based anionic aliphatic polyurethane SP-3106, water-based polycarbon polyurethane PU3461, water-based acrylic resin Crysol 6319, and water-based alkyd resin 6070 with a weight ratio of 75:10:5:10;
  • the water-based aluminum powder is composed of large aluminum powder, It is composed of small aluminum powder, wherein the particle size D50 of the large aluminum powder is 25-35 microns, the particle size D50 of the small aluminum powder is 8-15 microns, the mass percentage of the large aluminum powder is 35%, and the rest is the small aluminum powder; water dispersion
  • the agent is BYK-192;
  • the wetting and leveling agent is BYK-346 and Tego 270 with a weight ratio of 1:1;
  • the water-based defoamer is Tego810 and DAPRO DF 677 with a weight ratio of 1:1;
  • the water-based anti-settling agent is AQ-633E ;
  • Example 1 In the weight parts of Example 1, the water-based resin was adjusted to 58 parts, and the water-based aluminum powder was adjusted to 21 parts. Specifically, the above-mentioned water-based leveling agent, water-based anti-settling agent, and water-based wax slurry were added to water at a stirring rate of 1000 rpm, stirred for 15 minutes, and then added with a water-based defoamer and water-based dispersant, and stirred at a stirring speed of 1200 rpm for 5 minutes, Then add water-based aluminum powder, stir at 800 rpm for 15 minutes, add water-based resin, and stir at 600 rpm for 30 minutes to obtain self-drying water-based aluminum powder coating for PVC screen; under the same test, the polarization contrast is 339:1.
  • the water-based resin is composed of water-based anionic aliphatic polyurethane SP-3106, water-based acrylic resin Crysol 6319, and water-based alkyd resin 6070 with a weight ratio of 75:10:15;
  • the water-based aluminum powder is composed of large aluminum powder and small aluminum powder.
  • the particle size D50 of the powder is 25-35 microns, the particle size D50 of the small aluminum powder is 8-15 microns, the mass percentage of the large aluminum powder is 35%, and the rest is the small aluminum powder;
  • the water-based dispersant is BYK-192; wetting The leveling agent is BYK-346 and Tego 270 with a weight ratio of 1:1;
  • the water-based defoamer is Tego810 and DAPRO DF 677 with a weight ratio of 1:1;
  • the water-based anti-settling agent is AQ-633E;
  • the water-based wax slurry is LUBA-print 725.
  • the water-based auxiliary agent is added to the water, after stirring, the water-based aluminum powder is added, and the water-based resin is added under stirring. After stirring, the self-drying water-based aluminum powder coating for PVC screen is obtained.
  • the above-mentioned water-based leveling agent, water-based anti-settling agent, and water-based wax slurry were added to water at a stirring rate of 1000 rpm, stirred for 15 minutes, and then added with a water-based defoamer and water-based dispersant, and stirred at a stirring speed of 1200 rpm for 5 minutes, Then add water-based aluminum powder, stir at 800 rpm for 15 minutes, then add water-based resin, and stir at 600 rpm for 30 minutes to obtain self-drying water-based aluminum powder coating for PVC screen; under the same test, the gain brightness is 2.2.
  • PVC material is currently widely used in cinemas showing 3D movie effects. Its initial form is soft white PVC with holes. The surface is sprayed with a silver coating to protect the PVC substrate and enhance the 3D effect. The coating must have 3 An important performance index: gain brightness, scattering angle, polarization contrast; the gain brightness is the ratio of the screen reflection brightness in the 5° angle direction under the same lighting strip to the brightness of the ideal diffuse screen under the same conditions, which is reflected in the viewing angle.
  • the bright image is reflected in the fact that the viewers can have a good viewing effect from different angles, and there is no obvious difference between the viewing effect of the viewers in the middle and the two sides;
  • the polarization contrast, the linear polarization ratio of the 3D screen should not be less than 150:1, the larger the polarization ratio, the better the 3D projection effect, which is reflected in the audience's perception of the 3D effect.
  • the demand of moviegoers is generally above 150 in the industry. At this time, moviegoers have a strong sense of 3D effect, which meets moviegoers' pursuit of 3D effect.
  • the invention uses water-based paint instead of oil-based paint, uses water as a solvent, reduces cost, is safe and environmentally friendly, and greatly reduces environmental pollution and the health of construction workers; Resins with lower film forming temperatures do not require additional high-boiling co-solvents, reducing VOC emissions.
  • the finished movie screen prepared by the coating of Example 1 is shown in Figure 1, and the specific preparation method is conventional technology, and the present invention is the silver coating on the surface of the PVC material in the figure.

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Abstract

一种PVC银幕用自干型水性铝粉涂料及其制备方法与应用，包括水性树脂、水性铝粉、水性助剂以及水，其中水性树脂的质量百分数为50～60％，水性铝粉的质量百分数为20～25％，水性助剂为5～15％。进一步的，水性助剂包括水性分散剂、水性流平剂、水性消泡剂、水性防沉降剂、水性蜡浆。使用水性涂料代替油性涂料，以水为溶剂，降低了成本、安全环保，且大大减少对环境造成的污染和施工人员的身体健康；长时间使用银幕性能指标衰缓较慢，且因选用成膜温度较低的树脂不需要额外添加高沸点助溶剂，降低了VOC的排放。

Description

PVC银幕用自干型水性铝粉涂料及其制备方法与应用 技术领域
本发明属于涂料技术，具体涉及PVC银幕用自干型水性铝粉涂料及其制备方法与应用。
背景技术
现阶段PVC银幕涂层所用的涂料大部分都是油性的，它通过不同自干丙烯酸或醇酸树脂中的一种或几种搭配，再与铝粉以适当的比例混合，从而达到性能指标要求，施工时成分为主体银色涂料、有机溶剂，调漆配比为100:80-100，施工时固体份较低，有机溶剂含量较多。
现有的PVC银幕涂料存在几个缺点和不足：①由于使用油性涂料，存储场地必须为危险品专用仓库，增加了存储的成本，且存在安全隐患；②油性涂料为达到自干效果必然使用大量快干溶剂，不仅气味大，且极易被施工人员呼吸进入体内或者刺激裸露在外的皮肤造成健康影响；③由于油性涂料施工时使用大量有机溶剂稀释，且涂料本身含有大量有机溶剂，使用时和施工后不可避免挥发到环境中，造成环境污染；④油性涂料稀释需要使用有机溶剂，增加了成本；⑤喷涂自干后荧幕涂层中残留的有机溶剂很难完全挥发掉，荧幕在使用过程中，不断有溶剂挥发出来，给观影人员的舒适度带来一定的影响；⑥油性涂料使用的主体成膜树脂容易黄变，铝粉表面易氧化，当银幕放映1年后，银幕涂层会发黄发黑导致性能指标(增益亮度、散射角、偏振对比)会逐步衰缓降低，放映时无论舒服度还是3D效果都会受到很大影响。⑦浮型铝粉的水性银幕涂料自干后，涂层上面的铝粉很容易被触摸掉，出现发黑现象，当占有灰尘时无法用水或其它清洁剂清洗，且浮型铝粉最易氧化，偏振对比极易衰弱，大大减少银幕的使用时间。
发明内容
本发明使用水性涂料代替油性涂料，以水为溶剂，降低了成本、安全环保，且大大减少对环境造成的污染和施工人员的身体健康；长时间使用银幕性能指标衰缓较慢，且因选用成膜温度较低的树脂不需要额外添加高沸点助溶剂，降低了VOC的排放。
本发明采用如下技术方案：
PVC银幕用自干型水性铝粉涂料，包括水性树脂、水性铝粉、水性助剂以及水，其中水性树脂的质量百分数为50～60％，水性铝粉的质量百分数为20～25％，水性助剂为5～15％，余量为水。进一步的，水性助剂包括水性分散剂、水性流平剂、水性消泡剂、水性防沉降剂、水性蜡浆；优选的，水性分散剂、水性流平剂、水性消泡剂、水性防沉降剂、水性蜡浆的重量比为(0.5～2)∶(1～2)∶(0.2～0.5)∶(1～4)∶(3～6)。
本发明使用的水性树脂为水性阴离子脂肪族聚氨酯、水性聚碳聚氨酯、水性丙烯酸树脂、水性醇酸树脂中的一种或几种，挥发份远小于国家环保涂料VOC排放标准，符合环保要求；本发明水性树脂成膜性能好，不需要额外添加高沸点成膜助溶剂即可成膜，避免了助溶剂的使用量，因此，本发明PVC银幕用自干型水性铝粉涂料不含有助溶剂；本发明限定的水性树脂与水性环氧树脂、水性羟基丙烯酸等相比具有更好的自干性，表干一般30-60min，实干常温放置8小时即可，满足目前市场上的喷涂施工条件要求；结合其他组分制备的水性铝粉涂料干膜断裂伸长率为150-250％，具有很好的拉伸效果，涂层自干后对PVC荧幕的收卷和放置不会出现涂层表面断裂，方便使用厂家对成品的PVC银幕包装运输和安装；它对基材有很强的附着力，当涂层完全干燥后对PVC底材完全附着，不会出现长时间使用后出现脱落、与铝粉结合包裹不够的现象；不同类 型的水性树脂对于性能指标增益亮度、散射角、偏振对比都有不同的影响，优选的，水性阴离子脂肪族聚氨酯、水性聚碳聚氨酯、水性丙烯酸树脂、水性醇酸树脂的重量比为(40～100)∶(5～10)∶(2～5)∶(10～20)，所得到的拉伸强度与放映所需要的性能指标达到平衡，此时拉伸强度满足成品银幕的需要。
本发明公开的水性铝粉涂料干膜具有很好的透明度、耐水、耐候、耐黄变性，涂层长时间使用后可用水或清洁剂清洗，不用担心水对它的腐蚀，也不用担心空气中的湿度对它的耐候、黄变产生影响；其中铝粉更好的润湿分散，使每一片铝粉都可以与去离子水充分接触润湿，防止铝粉因润湿不充分导致的铝粉团聚或铺展不均匀；铝粉很好的分散到涂料中，也提高了银幕涂层的稳定性和性能值的稳定性；根据实施例，本发明铝粉润湿分散好，其银幕成品中铝粉排列的均匀且有叠加的层次感，此时测试性能值好，银幕不同地方的性能值差异最小，反之如果铝粉润湿分散不够，银幕成品中铝粉排列越混乱，没有规律性，性能值越差。尤其，本发明的涂料不需要哑粉，降低了成本，且通过配方限定，所得到的涂层偏振对比大，解决了现有技术需要添加哑粉以获得大偏振对比的偏见；因水性树脂中主要溶剂为水，不会造成环境污染、不易燃易爆、自干后残留的有机溶剂含量极少，不易黄变，解决了现有技术油性涂料的问题。
本发明使用的水性分散剂为BYK-192、BYK-190、AQ-330中的一种或几种；水洗流平剂为BYK-346、Tego 270、Tego KH 245、WE 2011中的一种或几种；水性消泡剂为BYK-028、BYK-022、Tego810、DAPRO DF 677中的一种或几种；水性防沉降剂为AQ-633E、RHEOLATE 299、VEsmody U505中的一种或几种；水性蜡浆为AQUATIX 8421、E-8046S、LUBA-print 725中的一种或几种。
银幕使用的软质带孔PVC材料本身很难润湿，尤其是PVC孔周围更难润湿，本发明涂料具有很高的润湿流平活性，涂膜可以更好的润湿PVC材料，让涂料更均匀的铺展在PVC材料表面，不露出PVC材料，PVC材料本身性能值很差，尤其是偏振对比只有20以下，所以涂料对PVC材料润湿越好，露出PVC材料底材的地方越少，银幕不同地方的性能值差异越小，观影人员体验的3D均匀效果越好。本发明涂料在施工过程中和施工后涂膜不产生微泡缺陷；在水性体系中极易乳化形成均匀一致的分布，此外还有很有的相容性，避免了不相容导致的发白或析出；铝粉很好的分散到涂料中，防止长时间放置后出现铝粉沉降或硬沉淀现象，铝粉定向排列且具有更好的的层次感，银幕的涂层更具有金属质感，给人强烈的视觉效果，同时还可以提高偏振对比。
本发明中，水性铝粉的粒径D50为8～35微米，优选的，铝粉由大铝粉、小铝粉组成，其中大铝粉的粒径D50为20～35微米，小铝粉的粒径D50为8～20微米，进一步优选的，大铝粉的质量百分数为30～40％，其余为小铝粉；铝粉以该比例合理的搭配使用情况下，不需要使用哑粉，降低了成本，所得到的偏振对比为最大值，搭配的使用可大幅度提升偏振对比。本发明水性铝粉可以为CCWL8009、ZW1305、HYDROLAN-2154、CCWH9324中的一种或几种。
上述PVC银幕用自干型水性铝粉涂料的制备方法为，将水性助剂加入水中，搅拌后加入水性铝粉，搅拌下加入水性树脂，搅拌后，得到PVC银幕用自干型水性铝粉涂料。现有技术少量银幕涂层是用浮型铝粉做的水性银幕涂料制作的，目前因这种技术存在掉铝粉、不能用手触摸等缺点无法被市场广泛认可。本发明涂料中，铝粉表面氧化慢，可以长时间保持性能指标偏振对比＞200；相比较浮型铝粉，它不会浮在涂层的表面，所以触摸后不会掉铝粉，可以用水和清洁 剂清洗，提高了银幕的使用时间；涂层增益亮度在2.2～3.0范围内，对于要求不同的银幕和增益亮度不同的放映要求都可以同时满足，提高了产品使用的宽广性，同时散射角＞40，也符合国家标准，偏振对比＞200，远远高于国家3D电影放映最低标准80，极限情况下可以做到3.0的增益亮度，偏振对比280～350。涂膜表干实干加快，达到更好的自干效果，水性产品不使用溶剂，减少了对环境中的排放，也降低了对施工人员的健康损害。
附图说明
图1为本发明PVC银幕用自干型水性铝粉涂料制备的电影银幕成品。
具体实施方式
与现有技术相比，本发明在原料上使用水代替了现有技术中的有机溶剂，无论存储还是施工更安全环保，对环境和施工人员的影响大大降低，且不影响荧幕放映时的效果；同时通过原料限定，银幕长时间使用后占有灰尘或其它污染物时可以清洗，且铝粉表面氧化更慢，偏振对比衰缓慢，提高了银幕使用的时间；银幕中残留的有机溶剂含量几乎为0，不会造成气味问题；此外使用的水性树脂也是耐黄变类型的，银幕使用后黄变更缓慢，相比油性而言，使用时间也更久。
本发明PVC银幕用自干型水性铝粉涂料，由水性树脂、水性铝粉、水性助剂以及水组成，其中水性树脂的质量百分数为50～60％，水性铝粉的质量百分数为20～25％，水性助剂为5～15％，其余为水。水性树脂由水性阴离子脂肪族聚氨酯、水性聚碳聚氨酯、水性丙烯酸树脂、水性醇酸树脂组成；水性助剂由水性分散剂、水性流平剂、水性消泡剂、水性防沉降剂、水性蜡浆组成；优选的，水性分散剂、水性流平剂、水性消泡剂、水性防沉降剂、水性蜡浆的重量比为(0.5～2)∶(1～2)∶(0.2～0.5)∶(1～4)∶(3～6)。
本发明涉及的原料都是涂料领域常规市售原料，涉及的具体制备方法以及测试方法都为涂料常规方法。
实施例
PVC银幕用自干型水性铝粉涂料(重量份为100)，由表1原料组成。
表1 实施例、对比例原料，重量份
  实施例一 对比例一 对比例二 对比例三
水性树脂 55 55 55 55
水性分散剂 1 1 1 1
水性流平剂 1.5 1.5 1.5 4.5
水性消泡剂 0.3 0.3 0.3 0.3
水性防沉降剂 2.5 2.5 2.5 2.5
水性蜡浆 4.5 4.5 4.5 1.5
水性铝粉 22 22 22 22
水 13.2 13.2 13.2 13.2
室温表干/实干时间 50分钟/8小时 100分钟/10小时 60分钟/9小时 55分钟/8.5小时
表1中，具体原料为：
实施例一、对比例二、对比例三中，水性树脂由重量比为75∶10∶5∶10的水性阴离子脂肪族聚氨酯SP-3106、水性聚碳聚氨酯PU3461、水性丙烯酸树脂Crysol 6319、水性醇酸树脂6070组成；对比例一中，水性树脂为水性阴离子脂肪族聚氨酯SP-3106。实施例一、对比例一、对比例三中，水性铝粉由大铝粉、小铝粉组成，其中大铝粉的粒径D50为25～35微米，小铝粉的粒径D50为8～15微米，大铝粉的质量百分数为35％，其余为小铝粉；对比例二中，水性铝粉粒径D50全部为8～15微米。
实施例以及对比例中，水性分散剂为BYK-192；润湿流平剂为重量比1∶1的BYK-346、Tego 270；水性消泡剂为重量比1∶1的Tego810、DAPRO DF 677；水性防沉降剂为AQ-633E；水性蜡浆为LUBA-print 725。
上述PVC银幕用自干型水性铝粉涂料的制备方法为，将水性助剂加入水中， 搅拌后加入水性铝粉，搅拌下加入水性树脂，搅拌后，得到PVC银幕用自干型水性铝粉涂料。具体的，将上述水性流平剂、水性防沉降剂、水性蜡浆在1000rpm搅拌速率下加入水中，搅拌15分钟，再加入水性消泡剂、水性分散剂，在1200rpm搅拌速率下搅拌5分钟，再加入水性铝粉，800rpm搅拌15分钟，再加入水性树脂，600rpm搅拌30分钟，即得到PVC银幕用自干型水性铝粉涂料。
将涂料涂覆在常规多孔PVC布表面，实干后根据常规测试方法，进行性能测试，结果见表2。
表2 涂料性能测试
Figure PCTCN2020136223-appb-000001
将对比例一中的水性树脂更换为水性环氧树脂WL-1104，其余不变，得到的涂料性能下降，增益亮度为2.0，偏振对比为167，不符合使用标准。
采用现有常规市售用于银幕的水性铝粉涂料、油性铝粉涂料进行同样的测试，膜厚也为35微米，增益亮度为2.4(水性)、2.5(油性)，偏振对比为238(水性)、216(油性)。
将实施例一的涂料常规涂覆在现有PVC多孔布(类似银幕用材)表面，完全干燥固化后，作为实验组，共大小一样的20块布；将现有市售用于银幕的水性铝粉涂料采用同样的方法涂覆现有PVC多孔布，完全干燥固化后，作为对比组，共大小一样的20块布。用洗衣机同时洗涤(根据布量常规放入洗衣粉)、 漂洗实验组以及对比例，不甩干，拿出自然晾晒，晒干后放置3天，再次进行同样的清洗，以此重复清洗五次，再进行性能测试。洗涤后，实验组性能变化小且20块布之间性能变化小，增益亮度为洗涤前的94～96％，偏振对比为洗涤前的90～93％；对比组性能变化大且20块布之间性能变化大，增益亮度为洗涤前的60～76％，偏振对比为洗涤前的63～75％。
实施例二
水性树脂由重量比为75∶10∶5∶10的水性阴离子脂肪族聚氨酯SP-3106、水性聚碳聚氨酯PU3461、水性丙烯酸树脂Crysol 6319、水性醇酸树脂6070组成；水性铝粉由大铝粉、小铝粉组成，其中大铝粉的粒径D50为25～35微米，小铝粉的粒径D50为8～15微米，大铝粉的质量百分数为35％，其余为小铝粉；水性分散剂为BYK-192；润湿流平剂为重量比1∶1的BYK-346、Tego 270；水性消泡剂为重量比1∶1的Tego810、DAPRO DF 677；水性防沉降剂为AQ-633E；水性蜡浆为LUBA-print 725。
将实施例一的重量份中，水性树脂调整为58份、水性铝粉调整为21份，相应减少水用量，水性助剂用量不变。具体的，将上述水性流平剂、水性防沉降剂、水性蜡浆在1000rpm搅拌速率下加入水中，搅拌15分钟，再加入水性消泡剂、水性分散剂，在1200rpm搅拌速率下搅拌5分钟，再加入水性铝粉，800rpm搅拌15分钟，再加入水性树脂，600rpm搅拌30分钟，即得到PVC银幕用自干型水性铝粉涂料；同样的测试下，偏振对比为339∶1。
实施例三
水性树脂由重量比为75∶10∶15的水性阴离子脂肪族聚氨酯SP-3106、水性丙烯酸树脂Crysol 6319、水性醇酸树脂6070组成；水性铝粉由大铝粉、小 铝粉组成，其中大铝粉的粒径D50为25～35微米，小铝粉的粒径D50为8～15微米，大铝粉的质量百分数为35％，其余为小铝粉；水性分散剂为BYK-192；润湿流平剂为重量比1∶1的BYK-346、Tego 270；水性消泡剂为重量比1∶1的Tego810、DAPRO DF 677；水性防沉降剂为AQ-633E；水性蜡浆为LUBA-print 725。
按照实施例一的重量份，将水性助剂加入水中，搅拌后加入水性铝粉，搅拌下加入水性树脂，搅拌后，得到PVC银幕用自干型水性铝粉涂料。具体的，将上述水性流平剂、水性防沉降剂、水性蜡浆在1000rpm搅拌速率下加入水中，搅拌15分钟，再加入水性消泡剂、水性分散剂，在1200rpm搅拌速率下搅拌5分钟，再加入水性铝粉，800rpm搅拌15分钟，再加入水性树脂，600rpm搅拌30分钟，即得到PVC银幕用自干型水性铝粉涂料；同样的测试下，增益亮度2.2。
PVC材料目前广泛应用于电影院放映3D电影效果的幕布，它初始形态为软质白色带孔的PVC，表面喷涂银色涂层起到保护PVC基材和增强3D效果的作用，该涂层必须具有3个重要的性能指标：增益亮度、散射角、偏振对比；其中增益亮度就是在同一照明条下，在5°角方向的银幕反射亮度与同样条件下理想漫散幕的亮度的比值，体现在观影时对眼睛的视觉刺激程度，根据国家标准和行业内标准，一般增益亮度2.2-2.6范围内，观影时对人的眼睛刺激最小，观影结束后眼睛最舒服，不易视角疲劳；散射角也称为视角，是指亮度系数为Rα＝0.7Rαmax(Ramax指该银幕的增益)时的2a角称为散射角，观看者观看银幕时，应处于散射角范围内，这样才能获得较为清晰、明亮的图像，体现在观影人员从不同的角度都可以有很好的观影效果，观影人员在中间与两边观影的效果无明显差异；偏振对比，3D银幕的直线偏振比不应小于150：1，偏振比越大，3D投影效果越好，体现为放映时观影人员对3D效果感官的强弱，当低于国家标准80 时，3D效果很弱，带来的3D效果无法满足观影人员的需求，一般行业内标准150以上，此时观影人员对3D的感官效果强烈，满足观影人员对3D效果的追求。本发明使用水性涂料代替油性涂料，以水为溶剂，降低了成本、安全环保，且大大减少对环境造成的污染和施工人员的身体健康；长时间使用银幕性能指标衰缓较慢，且因选用成膜温度较低的树脂不需要额外添加高沸点助溶剂，降低了VOC的排放。由实施例一涂料制备的电影银幕成品见附图1，具体制备方法为常规技术，本发明为图中PVC材料表面的银色涂层。

Claims (10)

  1. PVC银幕用自干型水性铝粉涂料，包括水性树脂、水性铝粉、水性助剂以及水，其中水性树脂的质量百分数为50～60％，水性铝粉的质量百分数为20～25％，水性助剂的质量百分数为5～15％，余量为水。
  2. 根据权利要求1所述PVC银幕用自干型水性铝粉涂料，其特征在于，水性助剂包括水性分散剂、水性流平剂、水性消泡剂、水性防沉降剂、水性蜡浆。
  3. 根据权利要求2所述PVC银幕用自干型水性铝粉涂料，其特征在于，水性分散剂、水性流平剂、水性消泡剂、水性防沉降剂、水性蜡浆的重量比为(0.5～2)∶(1～2)∶(0.2～0.5)∶(1～4)∶(3～6)。
  4. 根据权利要求1所述PVC银幕用自干型水性铝粉涂料，其特征在于，水性树脂为水性阴离子脂肪族聚氨酯、水性聚碳聚氨酯、水性丙烯酸树脂、水性醇酸树脂中的一种或几种。
  5. 根据权利要求4所述PVC银幕用自干型水性铝粉涂料，其特征在于，水性阴离子脂肪族聚氨酯、水性聚碳聚氨酯、水性丙烯酸树脂、水性醇酸树脂的重量比为(40～100)∶(5～10)∶(2～5)∶(10～20)。
  6. 根据权利要求1所述PVC银幕用自干型水性铝粉涂料，其特征在于，水性铝粉的粒径D50为8～35微米。
  7. 根据权利要求6所述PVC银幕用自干型水性铝粉涂料，其特征在于，铝粉由大铝粉、小铝粉组成，其中大铝粉的粒径D50为20～35微米，小铝粉的粒径D50为8～20微米。
  8. 权利要求1所述PVC银幕用自干型水性铝粉涂料的制备方法，其特征在于，将水性助剂加入水中，搅拌后加入水性铝粉，搅拌下加入水性树脂，搅拌后，得到PVC银幕用自干型水性铝粉涂料。
  9. 权利要求1所述PVC银幕用自干型水性铝粉涂料在制备PVC银幕中的应用。
  10. 根据权利要求9所述的应用，其特征在于，所述PVC银幕用自干型水性铝粉涂料作为银幕涂层。
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