CN112064367B - PVC composite material based on self-drying water-based aluminum powder coating and preparation method and application thereof - Google Patents
PVC composite material based on self-drying water-based aluminum powder coating and preparation method and application thereof Download PDFInfo
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
- D06N3/00—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
- D06N3/12—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof with macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. gelatine proteins
- D06N3/14—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof with macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. gelatine proteins with polyurethanes
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- D06N3/00—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
- D06N3/0002—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof characterised by the substrate
- D06N3/0015—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof characterised by the substrate using fibres of specified chemical or physical nature, e.g. natural silk
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- D06N3/00—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
- D06N3/0056—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof characterised by the compounding ingredients of the macro-molecular coating
- D06N3/0063—Inorganic compounding ingredients, e.g. metals, carbon fibres, Na2CO3, metal layers; Post-treatment with inorganic compounds
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- D06N3/00—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
- D06N3/04—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof with macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- D06N3/042—Acrylic polymers
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- D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
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- D06N3/121—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof with macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. gelatine proteins with polyesters, polycarbonates, alkyds
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/54—Accessories
- G03B21/56—Projection screens
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- D06N2209/00—Properties of the materials
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- D06N2209/00—Properties of the materials
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- D06N2209/00—Properties of the materials
- D06N2209/16—Properties of the materials having other properties
- D06N2209/1692—Weather resistance
Abstract
The invention discloses a PVC composite material based on self-drying water-based aluminum powder coating, a preparation method and an application thereof, wherein the PVC composite material comprises a PVC material and the self-drying water-based aluminum powder coating, the coating comprises water-based resin, water-based aluminum powder, a water-based auxiliary agent and water, the mass percent of the water-based resin is 50-60%, the mass percent of the water-based aluminum powder is 20-25%, and the mass percent of the water-based auxiliary agent is 5-15%. The invention uses the water-based paint to replace the oil-based paint, uses water as a solvent, reduces the cost, is safe and environment-friendly, and greatly reduces the pollution to the environment and the body health of constructors; the dry film has good transparency, water resistance, weather resistance and yellowing resistance, and the coating can be cleaned by water or a cleaning agent after being used for a long time without worrying about the corrosion of water on the coating and the influence of humidity in the air on the weather resistance and yellowing resistance of the coating.
Description
Technical Field
The invention belongs to the composite material technology, and particularly relates to a PVC composite material based on self-drying water-based aluminum powder paint, and a preparation method and application thereof.
Background
The PVC material is widely applied to the curtain for showing the 3D film effect in a cinema at present, the initial form is soft white PVC with holes, the surface is sprayed with a silver coating to play the roles of protecting the PVC substrate and enhancing the 3D effect, and the coating has 3 important performance indexes: gain brightness, scattering angle, polarization contrast; the gain brightness is the ratio of the screen reflection brightness in the 5-degree angle direction to the ideal diffuse screen brightness under the same illumination strip, the visual stimulation degree to eyes is reflected when the film is viewed, the gain brightness is generally within the range of 2.2-2.6 according to the national standard and the intra-industry standard, the stimulation to the eyes of people is minimum when the film is viewed, the eyes are most comfortable after the film is viewed, and the visual fatigue is not easy to occur; the scattering angle is also called as a viewing angle, namely a 2a angle when the brightness coefficient is R alpha =0.7R alpha max (Ramax refers to the gain of the screen) is called as a scattering angle, and when a viewer watches the screen, the viewer is within the range of the scattering angle, so that a clear and bright image can be obtained, the image is reflected that the viewer can have good viewing effect from different angles, and the viewing effect of the viewer in the middle is not obviously different from that of the viewer at two sides; polarization contrast, the linear polarization ratio of a 3D screen should not be less than 150:1, the bigger the polarization ratio, the better the 3D projection effect, the expression is that the shadow watching personnel can not meet the requirements of the shadow watching personnel for the 3D effect sense organ intensity during showing, when the polarization ratio is lower than the national standard 80, the 3D effect is very weak, the brought 3D effect can not meet the requirements of the shadow watching personnel, the standard is more than 150 in the general industry, the 3D sense organ effect of the shadow watching personnel is strong at the moment, and the pursuit of the shadow watching personnel for the 3D effect is met.
Most of the paint used for the PVC screen coating at the present stage is oily, and the paint meets the performance index requirement by matching one or more of different self-drying acrylic acid or alkyd resin and then mixing the self-drying acrylic acid or alkyd resin with aluminum powder in a proper proportion, wherein the paint comprises the following components of a main silver paint and an organic solvent in a paint mixing ratio of 100-80 in construction, and the paint has lower solid content and more organic solvent content in construction. However, the oil paint has inherent defects, such as dangerous storage, difficult volatilization and harmful environment and human body, and water paint is developed gradually, but the aluminum paint is different from other water paint, the application field leads the aluminum paint to have different performance to meet the requirement of film projection, but after the water screen paint of the existing aluminum paint is dried by air, the aluminum powder on the coating is easy to touch, the blackening phenomenon occurs, the paint cannot be cleaned by water or other cleaning agents when dust is occupied, the floating aluminum powder is most easily oxidized, the polarization contrast is very easy to weaken, and the service time of the screen is greatly reduced.
Disclosure of Invention
The invention uses the water-based paint to replace the oil-based paint, uses water as a solvent, reduces the cost, is safe and environment-friendly, and greatly reduces the pollution to the environment and the body health of constructors; the performance index of the screen slowly decays after long-time use, and a high-boiling point cosolvent is not required to be additionally added due to the selection of the resin with lower film forming temperature, so that the discharge of VOC is reduced.
The invention adopts the following technical scheme:
the PVC composite material based on the self-drying water-based aluminum powder coating comprises a PVC material and the self-drying water-based aluminum powder coating; the self-drying water-based aluminum powder coating comprises 50-60% of water-based resin, 20-25% of water-based aluminum powder, 5-15% of water-based auxiliary agent and the balance of water. Further, the water-based auxiliary agent comprises a water-based dispersing agent, a water-based leveling agent, a water-based defoaming agent, a water-based anti-settling agent and water-based wax slurry; preferably, the weight ratio of the aqueous dispersant to the aqueous leveling agent to the aqueous defoamer to the aqueous wax slurry is (0.5-2) to (1-2) to (0.2-0.5) to (1-4) to (3-6).
In the invention, the PVC material is porous PVC cloth and is a conventional material of a film curtain, the invention is not limited to this, and the PVC material can be obtained by using commercially available conventional raw materials. The PVC composite material based on the air-drying type water-based aluminum powder coating is dried to obtain the PVC screen, and the PVC screen can be dried naturally or dried by heating.
The preparation method of the PVC composite material based on the self-drying water-based aluminum powder coating comprises the steps of adding the water-based auxiliary agent into water, adding the water-based aluminum powder after stirring, adding the water-based resin while stirring, and obtaining the self-drying water-based aluminum powder coating after stirring; and coating the self-drying water-based aluminum powder coating on the surface of the PVC material to obtain the PVC composite material based on the self-drying water-based aluminum powder coating. A small amount of screen coatings in the prior art are made of water-based screen paints made of floating aluminum powder, and the defects of aluminum powder falling, incapability of touching by hands and the like in the prior art cannot be widely accepted by the market. In the coating, the surface of the aluminum powder is slowly oxidized, and the polarization contrast of performance indexes can be kept to be more than 200 for a long time; compared with floating aluminum powder, the aluminum powder does not float on the surface of the coating, so the aluminum powder cannot fall off after touching, and the aluminum powder can be cleaned by water and a cleaning agent, so that the service time of the screen is prolonged; the gain brightness of the coating is within the range of 2.2-3.0, the requirements of different screens and projection with different gain brightness can be met at the same time, the product use universality is improved, the scattering angle is larger than 40, the national standard is met, the polarization contrast is larger than 200 and far higher than the national minimum standard 80 for 3D film projection, the gain brightness of 3.0 can be achieved under the limit condition, and the polarization contrast is 280-350. The surface drying of the coating is accelerated, a better self-drying effect is achieved, the water-based product does not use a solvent, the emission to the environment is reduced, and the health damage to constructors is also reduced.
The water-based resin used in the invention is one or more of water-based anionic aliphatic polyurethane, water-based polycarbopolyurethane, water-based acrylic resin and water-based alkyd resin, and the volatile matter is far less than the VOC emission standard of national environment-friendly coatings, thus meeting the requirement of environmental protection; the water-based resin disclosed by the invention is good in film-forming property, can form a film without additionally adding a high-boiling-point film-forming cosolvent, and avoids the using amount of the cosolvent, so that the self-drying water-based aluminum powder coating-based PVC composite material does not contain the cosolvent; compared with waterborne epoxy resin, waterborne hydroxy acrylic acid and the like, the waterborne resin has better self-drying property, the surface drying is generally 30-60min, the waterborne resin is dried and placed for 8 hours at normal temperature, and the requirement of spraying construction conditions on the current market is met; the elongation at break of a dry film of the water-based aluminum powder coating prepared by combining other components is 150-250%, the water-based aluminum powder coating has a good stretching effect, the coating does not break on the surface of the coating when being wound and placed on a PVC screen after the coating is self-dried, and a user can conveniently package, transport and install the finished PVC screen; the coating has strong adhesive force to a base material, and can be completely attached to a PVC base material after the coating is completely dried, so that the phenomena of falling off and insufficient combination and wrapping with aluminum powder after long-time use can be avoided; different types of aqueous resins have different influences on performance indexes such as gain brightness, scattering angle and polarization contrast, preferably, the weight ratio of the aqueous anionic aliphatic polyurethane to the aqueous polycarbopolyurethane to the aqueous acrylic resin to the aqueous alkyd resin is (40-100) to (5-10) to (2-5) to (10-20), the obtained tensile strength is balanced with the performance index required by projection, and the tensile strength meets the requirement of a finished screen.
The water-based dispersant used in the 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; the water-based antifoaming agent is one or more of BYK-028, BYK-022, tego810 and DAPRO DF 677; the water-based anti-settling agent is one or more of AQ-633E, RHEOLATE 299 and VESMODY U505; the water-based wax slurry is one or more of AQUATIX 8421, E-8046S and LUBA-print 725.
In the invention, the particle diameter D50 of the water-based aluminum powder is 8-35 microns, preferably, the aluminum powder consists of large aluminum powder and small aluminum powder, wherein the particle diameter D50 of the large aluminum powder is 20-35 microns, the particle diameter D50 of the small aluminum powder is 8-20 microns, further preferably, the mass percent of the large aluminum powder is 30-40%, and the balance is the small aluminum powder; under the aluminium powder with the reasonable collocation in this proportion use case, need not use dumb powder, the cost is reduced, the polarization contrast that obtains is the maximum value, and the use of collocation can promote the polarization contrast by a wide margin. The waterborne aluminum powder can be one or more of CCWL8009, ZW1305, HYDROLAN-2154 and CCWH 9324.
The water-based aluminum powder paint dry film disclosed by the invention has good transparency, water resistance, weather resistance and yellowing resistance, and the coating can be cleaned by water or a cleaning agent after being used for a long time without worrying about the corrosion of water on the coating and the influence of humidity in the air on the weather resistance and yellowing of the coating; the aluminum powder is better wetted and dispersed, so that each piece of aluminum powder can be fully contacted and wetted with deionized water, and the agglomeration or uneven spreading of the aluminum powder caused by insufficient wetting of the aluminum powder is prevented; the aluminum powder is well dispersed in the coating, and the stability of the screen coating and the stability of performance values are also improved; according to the embodiment, the aluminum powder of the invention has good wetting and dispersing performance, the arrangement of the aluminum powder in the finished screen product is uniform and has superimposed layering, the performance value is good, the difference of the performance values of different parts of the screen is minimal, otherwise, if the aluminum powder is not sufficient to be wetted and dispersed, the arrangement of the aluminum powder in the finished screen product is more disordered and irregular, and the performance value is worse. Particularly, the coating does not need matte powder, so that the cost is reduced, and the obtained coating has large polarization contrast due to the limitation of the formula, so that the prejudice that the matte powder needs to be added to obtain large polarization contrast in the prior art is solved; the main solvent in the water-based resin is water, so that the water-based resin does not cause environmental pollution, is not flammable and explosive, has little content of residual organic solvent after air drying, is not easy to yellow, and solves the problem of the oil-based paint in the prior art.
The soft perforated PVC material used for the screen is difficult to wet, particularly the periphery of a PVC hole is difficult to wet, the coating has high wetting leveling activity, the coating can wet the PVC material better, the coating can be spread on the surface of the PVC material more uniformly, the PVC material is not exposed, the performance value of the PVC material is poor, particularly, the polarization contrast is only below 20, so the coating wets the PVC material better, the places where the PVC material substrate is exposed are fewer, the performance value difference of different places of the screen is smaller, and the 3D uniformity effect experienced by a viewer is better. The coating of the invention does not generate micro bubble defects during and after construction; the emulsion is very easy to emulsify in an aqueous system to form uniform and consistent distribution, and has very good compatibility, so that whitening or precipitation caused by incompatibility is avoided; the aluminum powder is well dispersed in the coating, the phenomenon of aluminum powder sedimentation or hard precipitation after long-time placement is prevented, the aluminum powder is directionally arranged and has better layering, the coating of the screen has metal texture, strong visual effect is brought to people, and meanwhile, the polarization contrast can be improved.
Drawings
FIG. 1 is a schematic structural diagram of a PVC composite material based on a self-drying water-based aluminum powder coating of the invention;
wherein, 1 is a conventional PVC material, and 2 is a self-drying water-based aluminum powder coating;
FIG. 2 is a film screen finished product prepared from the PVC composite material based on the self-drying water-based aluminum powder coating.
Detailed Description
Compared with the prior art, the invention uses water to replace organic solvent in the prior art, is safer and more environment-friendly in storage and construction, greatly reduces the influence on environment and constructors, and does not influence the effect of screen projection; meanwhile, due to the limitation of raw materials, the screen can be cleaned when occupying dust or other pollutants after being used for a long time, the surface of the aluminum powder is slowly oxidized, the polarization contrast is slowly attenuated, and the using time of the screen is prolonged; the content of the residual organic solvent in the screen is almost 0, so that the odor problem can not be caused; in addition, the used water-based resin is also of a yellowing resistant type, the screen is yellowed more slowly after being used, and the using time is longer than that of oil.
The PVC composite material based on the self-drying water-based aluminum powder coating consists of a conventional PVC material and the self-drying water-based aluminum powder coating, and is shown in figure 1; the self-drying water-based aluminum powder coating consists of 50-60% of water-based resin, 20-25% of water-based aluminum powder, 5-15% of water-based auxiliary agent and the balance of water. The water-based resin consists of water-based anionic aliphatic polyurethane, water-based polycarbopolyurethane, water-based acrylic resin and water-based alkyd resin; the water-based auxiliary agent consists of a water-based dispersing agent, a water-based flatting agent, a water-based defoaming agent, a water-based anti-settling agent and water-based wax slurry; preferably, the weight ratio of the water-based dispersing agent to the water-based leveling agent to the water-based defoaming agent to the water-based anti-settling agent to the water-based wax slurry is (0.5-2) to (1-2) to (0.2-0.5) to (1-4) to (3-6).
The raw materials involved in the invention are all conventional and commercially available raw materials in the field of coatings, and the specific preparation method and the test method involved in the invention are all conventional methods for coatings.
Examples
The preparation method of the PVC composite material based on the self-drying water-based aluminum powder coating comprises the steps of adding the water-based auxiliary agent into water, adding the water-based aluminum powder after stirring, adding the water-based resin while stirring, and obtaining the self-drying water-based aluminum powder coating after stirring; coating the self-drying water-based aluminum powder coating on the surface of a PVC material conventionally to obtain a PVC composite material based on the self-drying water-based aluminum powder coating; and (5) obtaining the screen after conventional natural drying or heating drying. Specifically, the water-based leveling agent, the water-based anti-settling agent and the water-based wax slurry are added into water at a stirring speed of 1000rpm, stirred for 15 minutes, then the water-based antifoaming agent and the water-based dispersing agent are added, stirred for 5 minutes at a stirring speed of 1200rpm, then the water-based aluminum powder is added, stirred for 15 minutes at 800rpm, then the water-based resin is added, and stirred for 30 minutes at 600rpm, so that the self-drying water-based aluminum powder coating is obtained; and coating the self-drying water-based aluminum powder coating on the surface of the porous PVC cloth to obtain the PVC composite material based on the self-drying water-based aluminum powder coating.
The self-drying water-based aluminum powder coating (100 parts by weight) is composed of the raw materials in the following table 1.
TABLE 1 raw materials of examples and comparative examples, parts by weight
| Example one | Comparative example 1 | Comparative example No. two | Comparative example No. three | |
| Aqueous resin | 55 | 55 | 55 | 55 |
| Aqueous dispersant | 1 | 1 | 1 | 1 |
| Aqueous leveling agent | 1.5 | 1.5 | 1.5 | 4.5 |
| Aqueous defoamer | 0.3 | 0.3 | 0.3 | 0.3 |
| Water-based anti-settling agent | 2.5 | 2.5 | 2.5 | 2.5 |
| Aqueous wax slurry | 4.5 | 4.5 | 4.5 | 1.5 |
| Aqueous aluminum powder | 22 | 22 | 22 | 22 |
| Water (W) | 13.2 | 13.2 | 13.2 | 13.2 |
| Room temperature surface dry/solid dry time | 50 minutes/8 hours | 100 minutes/10 hours | 60 minutes/9 hours | 55 minutes/8.5 hours |
In table 1, the specific raw materials are:
in the first embodiment, the second embodiment and the third embodiment, the aqueous resin comprises aqueous anionic aliphatic polyurethane SP-3106, aqueous polycarbopolyurethane PU3461, aqueous acrylic resin Crysol 6319 and aqueous alkyd resin 6070 in a weight ratio of 75: 10: 5: 10; in comparative example one, the aqueous resin was an aqueous anionic aliphatic polyurethane SP-3106. In the first embodiment, the first comparative example and the third comparative example, the water-based aluminum powder consists of large aluminum powder and 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 percent of the large aluminum powder is 35%, and the balance is the small aluminum powder; in the second comparative example, the particle size D50 of the waterborne aluminum powder is all 8-15 microns.
In the examples and comparative examples, the aqueous dispersant was BYK-192; the wetting and leveling agent is BYK-346 and Tego 270 with the weight ratio of 1: 1; the water-based antifoaming agent is Tego810 and DAPRO DF 677 with the weight ratio of 1: 1; the water-based anti-settling agent is AQ-633E; the aqueous wax slurry is LUBA-print 725.
After the PVC composite material based on the self-drying water-based aluminum powder coating is dried, performance test is carried out according to a conventional test method, and the results are shown in Table 2.
TABLE 2 paint Performance test
The aqueous resin in comparative example I was replaced with aqueous epoxy resin WL-1104, and the balance was unchanged, resulting in a coating with reduced performance, a gain of 2.0 in brightness, a polarization contrast of 167, and not meeting the use standards.
The same test was carried out using the conventional water-based aluminum powder paint and oil-based aluminum powder paint which are commercially available for screens, and the film thickness was 35 μm, the gain brightness was 2.4 (water-based) and 2.5 (oil-based), and the polarization contrast was 238 (water-based) and 216 (oil-based).
Completely drying the PVC composite material based on the self-drying water-based aluminum powder coating, and taking the PVC composite material as an experimental group, wherein the PVC composite material is composed of 20 pieces of cloth with the same size; the existing commercial water-based aluminum powder coating for the screen is coated on the existing porous PVC cloth by the same method, and after the existing porous PVC cloth is completely dried and cured, the obtained porous PVC cloth is used as a comparison group, and 20 pieces of cloth with the same size are used. Washing with a washing machine (adding washing powder according to cloth amount routine), rinsing the experimental group and the comparative example at the same time, taking out without spin-drying, naturally airing, standing for 3 days after airing, performing the same cleaning again, repeating the cleaning for five times, and performing performance test. After washing, the performance change of the experimental group is small, the performance change among 20 pieces of cloth is small, the gain brightness is 94-96% before washing, and the polarization contrast is 90-93% before washing; the contrast group has large performance change and large performance change among 20 pieces of cloth, the gain brightness is 60-76% before washing, and the polarization contrast is 63-75% before washing.
Example two
The water-based resin consists of water-based anionic aliphatic polyurethane SP-3106, water-based polycarbopolyurethane PU3461, water-based acrylic resin Crysol 6319 and water-based alkyd resin 6070 in a weight ratio of 75: 10: 5: 10; the water-based aluminum powder consists of large aluminum powder and 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 percent of the large aluminum powder is 35%, and the balance is the small aluminum powder; the aqueous dispersant is BYK-192; the wetting and leveling agent is BYK-346 and Tego 270 with the weight ratio of 1: 1; the water-based antifoaming agent is Tego810 and DAPRO DF 677 with the weight ratio of 1: 1; the water-based anti-settling agent is AQ-633E; the aqueous wax slurry is LUBA-print 725.
In the first part by weight of the example, the water-based resin is adjusted to 58 parts, the water-based aluminum powder is adjusted to 21 parts, the water consumption is correspondingly reduced, and the water-based auxiliary agent consumption is unchanged. Specifically, the water-based leveling agent, the water-based anti-settling agent and the water-based wax slurry are added into water at a stirring speed of 1000rpm, stirred for 15 minutes, then the water-based antifoaming agent and the water-based dispersing agent are added, stirred for 5 minutes at a stirring speed of 1200rpm, then the water-based aluminum powder is added, stirred for 15 minutes at 800rpm, then the water-based resin is added, and stirred for 30 minutes at 600rpm, so that the self-drying water-based aluminum powder coating is obtained; under the same test, the polarization contrast was 339: 1.
EXAMPLE III
The water-based resin consists of water-based anionic aliphatic polyurethane SP-3106, water-based acrylic resin Crysol 6319 and water-based alkyd resin 6070 in a weight ratio of 75: 10: 15; the water-based aluminum powder consists of large aluminum powder and 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 percent of the large aluminum powder is 35%, and the balance is the small aluminum powder; the aqueous dispersant is BYK-192; the wetting and leveling agent is BYK-346 and Tego 270 with the weight ratio of 1: 1; the water-based antifoaming agent is Tego810 and DAPRO DF 677 with the weight ratio of 1: 1; the water-based anti-settling agent is AQ-633E; the aqueous wax slurry is LUBA-print 725.
Adding the water-based auxiliary agent into water according to the weight parts of the first embodiment, adding the water-based aluminum powder after stirring, adding the water-based resin while stirring, and stirring to obtain the self-drying water-based aluminum powder coating for the PVC screen. Specifically, the water-based leveling agent, the water-based anti-settling agent and the water-based wax slurry are added into water at a stirring speed of 1000rpm, stirred for 15 minutes, then the water-based antifoaming agent and the water-based dispersing agent are added, stirred for 5 minutes at a stirring speed of 1200rpm, then the water-based aluminum powder is added, stirred for 15 minutes at 800rpm, then the water-based resin is added, and stirred for 30 minutes at 600rpm, so that the self-drying water-based aluminum powder coating is obtained; under the same test, the gain brightness is 2.2.
The existing PVC screen coating has several disadvantages and shortcomings: (1) because the oil paint is used, a storage place must be a special warehouse for dangerous goods, the storage cost is increased, and potential safety hazards exist; (2) in order to achieve the self-drying effect, a large amount of quick-drying solvent is inevitably used in the oil paint, so that the oil paint has a large smell and is very easy to breathe by constructors and enter the body or irritate the exposed skin to cause health influence; (3) because a large amount of organic solvent is used for diluting the oily paint during construction, and the paint contains a large amount of organic solvent, the oily paint is inevitably volatilized into the environment during use and after construction, and the environment pollution is caused; (4) the oil paint needs to be diluted by an organic solvent, so that the cost is increased; (5) residual organic solvent in the screen coating after self-drying is sprayed is difficult to completely volatilize, and the solvent is continuously volatilized in the use process of the screen, so that certain influence is brought to the comfort level of shadow watching personnel; (6) the main film-forming resin used by the oily paint is easy to yellow and oxidize on the surface of aluminum powder, when a screen is projected for 1 year, the screen coating can turn yellow and black, so that performance indexes (gain brightness, scattering angle and polarization contrast) can be gradually reduced, and the comfort and the 3D effect are greatly influenced during projection. (7) After the water-based screen coating of the floating aluminum powder is dried in air, the aluminum powder on the coating is easy to touch, the blackening phenomenon occurs, the coating cannot be cleaned by water or other cleaning agents when the coating occupies dust, the floating aluminum powder is most easily oxidized, the polarization contrast is very easily weakened, and the service time of the screen is greatly reduced. The invention uses the water-based paint to replace the oil-based paint, uses water as a solvent, reduces the cost, is safe and environment-friendly, and greatly reduces the pollution to the environment and the body health of constructors; the performance index of the screen slowly decays after long-time use, and the resin with lower film-forming temperature does not need to be additionally added with high-boiling point cosolvent, so that the discharge of VOC is reduced. The film screen finished product prepared by the self-drying water-based aluminum powder coating-based PVC composite material is shown in the attached figure 2, the specific preparation method is a conventional technology, and the creativity of the invention is a silver coating on the surface of the PVC material in the figure.
Claims (6)
1. The PVC composite material based on the self-drying water-based aluminum powder coating comprises a PVC material and the self-drying water-based aluminum powder coating; the self-drying water-based aluminum powder coating comprises 50-60% of water-based resin, 20-25% of water-based aluminum powder, 5-15% of water-based auxiliary agent and the balance of water; the water-based resin is water-based anionic aliphatic polyurethane, water-based polycarbopolyurethane, water-based acrylic resin and water-based alkyd resin; the water-based auxiliary agent comprises a water-based dispersing agent, a water-based flatting agent, a water-based defoaming agent, a water-based anti-settling agent and water-based wax slurry; the weight ratio of the water-based dispersant to the water-based leveling agent to the water-based defoamer to the water-based anti-settling agent to the water-based wax slurry is (0.5-2) to (1-2) to (0.2-0.5) to (1-4) to (3-6); the weight ratio of the water-based anionic aliphatic polyurethane to the water-based polycarbopolyurethane to the water-based acrylic resin to the water-based alkyd resin is (40-100) to (5-10) to (2-5) to (10-20); the aluminum powder consists of large aluminum powder and small aluminum powder, wherein the particle size D50 of the large aluminum powder is 20-35 microns, the particle size D50 of the small aluminum powder is 8-20 microns, and the mass percent of the large aluminum powder is 30-40%.
2. The PVC composite material based on the self-drying water-based aluminum powder coating as claimed in claim 1, wherein the PVC material is porous PVC cloth.
3. The PVC composite material based on the self-drying water-based aluminum powder paint as claimed in claim 1, wherein the self-drying water-based aluminum powder paint is coated on the surface of the PVC material to obtain the PVC composite material based on the self-drying water-based aluminum powder paint.
4. The preparation method of the PVC composite material based on the self-drying water-based aluminum powder coating as claimed in claim 1, wherein the self-drying water-based aluminum powder coating is obtained by adding the water-based auxiliary agent into water, adding the water-based aluminum powder after stirring, adding the water-based resin while stirring, and stirring; and coating the self-drying water-based aluminum powder coating on the surface of the PVC material to obtain the PVC composite material based on the self-drying water-based aluminum powder coating.
5. Use of the PVC composite material based on self-drying aqueous aluminum powder paint as claimed in claim 1 for the preparation of PVC screens.
6. The use as claimed in claim 5, wherein the PVC composite material based on the self-drying water-based aluminum powder coating is dried to obtain a PVC screen.
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