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AU2014100870A4 - Transparent, heat-insulting, UV-blocking coatings - Google Patents

Transparent, heat-insulting, UV-blocking coatings Download PDF

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AU2014100870A4
AU2014100870A4 AU2014100870A AU2014100870A AU2014100870A4 AU 2014100870 A4 AU2014100870 A4 AU 2014100870A4 AU 2014100870 A AU2014100870 A AU 2014100870A AU 2014100870 A AU2014100870 A AU 2014100870A AU 2014100870 A4 AU2014100870 A4 AU 2014100870A4
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Australia
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transparent
blocking
heat
coating
insulting
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AU2014100870A
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Rong Fan
Jian Sun
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AUSTRALIA SMART TECHLIVING Pty Ltd
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AUSTRALIA SMART TECHLIVING Pty Ltd
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Abstract

Abstract Disclosed herein is a method of obtaining transparent, heat-insulating, UV-blocking coating through the incorporation of various nanopowders into coating formulaion, wchi are able to shield UV light and infrared light in sun radiation to provide heat insulting and UV blocking performance. As-produced coatings are capable of reducing the transmission of solar energy and UV radiation from outside, which can decrease energy consumption for cooling/heating and protect human beings/decoration materials insides from sun damage. The transparent, heat-insulting, UV-blocking coating disclosed in this invention can be manufactured by a process comprising the steps of: (1) Preparing nanodispersions from one or a mixture of nanopowders, which are capable of shielding UV light and infrared light; (2) Blending the nanodispersions with film formation materials and other necessary additives to obtain transparent, heat-insulting, UV-blocking coating; (3) Applying above obtained coating on the surface of various transparent materials to form a transparent layer that endows the substrates with heat-insulting and UV-blocking properties. As disclosed coatings can be applied on various transparent substrates from organic materials, like glass, to inorganic materials, like polymer films.

Description

EDITORIAL NOTE Application No. 2014100870 There is 8 pages of description Field The present invention relates to a transparent, heat-insulting, UV-blocking coating, which can be applied on inorganic and organic glass for energy saving purpose. Background In order to prevent sun radiation, various approaches have been developed to modify the light transmission property of transparent materials such as glass. For example, adhesive films containing thin metal layers have been used widely for car windows to shield sun radiation, which in turn reduces the damages of harmful UV radiation to human beings and decrease the energy consumption of air conditioner. Besides adhesive window films, thin metal layers have also been directly deposited on the surface of glass during glass production process, such as Low-E glass. Recently, many metal oxides have been found to possess excellent optical properties. For example, antinomy tin oxide (ATO) is known to be able to block the near infrared light in the wavelength range of 1400 nm to 2500 nm, indium tin oxide (ITO) has the capability to block infrared light from 1100 nm to 2500 nm, while specially processed ITO can block a much wide range of infrared light from 900 nm to 2500 nm. (Patent US5518810, EP1008564, US6620872, US691154) Ultrafine nanopowders like titanium dioxide, zinc oxide, iron oxide possess outstanding UV light blocking property, which can prevent UV radiation initiated degradation of the decoration materials inside. Among the commonly used ultrafine nanopowders, nano titanium dioxide, especially iron or manganese doped nano titanium dioxide has the capability of shielding UV light with the wavelength below 390 nm. Besides, compared to organic UV stabilizers, inorganic UV stabilizers, such as nano titanium dioxide, do not degrade along using, which ensures long term UV shielding performance. Although these nanoparticles have very attractive properties, it is still difficult to directly use them in transparent coatings. Attributing to their high surface energy and specific surface area, nanoparticles usually are not thermal dynamically stable, which means there is a strong tendency for them to aggregate and form large agglomerates that are difficult to disperse. Therefore, a dispersion of nanoparticles is commonly prepared forehand and then blended with other coating components. However, nanodispersions prepared by current technique have a series of drawbacks, including low solid content, large average particle size, short storage time, and so on. The solid content of the dispersion described in Chinese patents CN 101054455A and CN 1563231A is around 2 wt% ~ 15 wt%. One consequence of such low solid content is the requirement to proceed two coating cycles (cast and dry), which usually brings negative effects on coatings' optical properties. Chinese patent CN101230234A has provided a method to produce nanodispersion with the solid content of 40 wt% based on co-precipitation and surface modification method. However, the production process is very complicated and is unable to obtain high-solid-content dispersions with long term stability. This invention has utilized the synergetic effect between two types of dispersant: one is wetting agent, which is able to disperse nanopowders quickly during grinding, while the other one is hyperdispersant, which can endow the dispersed nanopowders long term stability by avoiding secondary coagulation. The nanodispersion produced through this method can maintain stability after storing for more than half year. Description A detailed disclosure for the purpose of illustrating representative embodiments of the present invention are given below, but the present invention should not be construed as being limited by these embodiments. The present invention discloses a method to obtain transparent, heat insulting, UV blocking coatings through the incorporation of various nanopowders into coating formulation, which are able to shield UV light and infrared light in sun radiation to provide heat insulting and UV blocking performance. As-produced coatings are capable of reducing the transmission of solar energy and UV radiation from outside, which can decrease energy consumption for cooling/heating and protect human beings/decoration materials insides from sun damage. The major advantages of the transparent, heat-insulting, UV-blocking coating disclosed in the present invention include: 1. This invention discloses a method to produce nanodispersions with high solid content and high colloidal stability, which simplifies the further coating production process and ensures the high optical performance of the coating; 2. This invention discloses a transparent, heat-insulating, UV-blocking coating that can be applied directly on various transparent substrates, such as glass, polycarbonate, organic glass, polyester, etc. This coating has excellent adhesion to the substrates, which can be applied by blade coating, curtain coating or spray coating process to endow the substrates with UV and infrared light blocking properties. The transparent, heat-insulting, UV-blocking coating disclosed in this invention can be manufactured by a process comprising the steps of: (1) Preparing nanodispersions from one or a mixture of nanopowders, which are capable of shielding UV light and infrared light; (2) Blending the nanodispersions with film formation materials and other necessary additives to obtain transparent, heat-insulting, UV-blocking coating; (3) Applying above obtained coating on the surface of various transparent materials to form a transparent layer that endows the substrates with heat-insulting and UV-blocking properties. In this invention, heat-insulting property is derived from the shielding effect of infrared light in sun radiation, because most of the heat brought by sun is generated by the infrared part in sunlight. Therefore, heat-insulting and infrared light shielding properties can be seen as identical in this invention. In the present invention, nanodispersions which have UV blocking and infrared light shielding properties were generated by grinding corresponding nanopowders in special milling equipment. The nanopowders used herein denote as the materials that possessing low transmission rate of infrared light and UV light in sun radiation, which are selected from antimony tin oxide (ATO), indium tin oxide (ITO), lanthanum hexaboride (LaB 6 ), doped vanadium dioxide (V0 2 ), titanium dioxide, zinc oxide, iron oxide. UV blocking powder is preferred to be nano titanium dioxide. More preferred is iron, or manganese doped nano titanium dioxide. Infrared light shielding powders are preferred to be ATO, ITO and LaB 6 . The concentration of infrared light shielding powders in the nanodispersion is preferred to be 20 wt% - 40 wt%, while the concentration of UV blocking powders in the nanodispersion is preferred to be 10 wt% -30 wt%. The nanodispersion described herein has used two types of dispersants, wetting dispersant and hyperdispersant, such as modified acrylic polymer based dispersant, polyester based dispersant and fatty amine based dispersant, which can stabilize the dispersed particles through two mechanisms: electrostatic repulsion and steric hindrance. According to the feature of film formation materials, dispersants used herein can be either water-based or solvent based. The total amount of the dispersants is around 5 wt% - 30 wt% based on the weight of nanopowders. The nanodispersion described herein can be either solvent-based or water-based depending on the feature of the film formation materials. For solvent-based nanodispersions, the solvent is selected from ethanol, butanol, xylene, ethyl acetate, and the mixture thereof. The concentration of the continuous phase in nanodipsersions, which can be either water or solvent, is preferred to 40 wt% - 67 wt%. The nanodispersion used herein was produced by grinding of nanopoweders in special milling equipment, the solid content of which is in the range of 30 wt% to 50 wt%. The average particle size of the dispersed powders was around 50 nm to 150 nm, while the distribution in the range from 10 nm to 200 nm. As-prepared nanodispersion is thermaldynamically stable at ambient temperature for more than 6 months. The transparent, heat insulting, UV blocking coating described herein was prepared by blending nanodispersion, containing infrared light and UV shielding nanoparticles, with film formation materials. The concentration of nanodispersion is in the range of 10 wt% to 80 wt%, while the content of film formation materials ranges from 20 wt% to 80 wt%. As-preared coating is able to shielding more than 70% of the infrared light and 85% of the UV light. The film formation materials used herein can form films in the temperature range from 0 C to 200 C with or without the assistant of curing agent.
The film formation materials used herein are selected from (meth) acrylic polymer, polyurethane, alkyd resin, amino resin, organic silicone resin, inorganic silicate, the dispersions/latexes of above materials and the mixture thereof. For solvent based resin systems, such as (meth) acrylic polymer, polyurethane, alkyd resin, amino resin and organic silicone resin, certain amount of solvent, leveling agent, deformer and adhesion promoter can be added to form single-component or two-component clear coat. Organic silicone resin is preferred as the film formation material due to its excellent weathering property. For the dispersion/latexes of resins/polymers listed above, coalescing agent, thickener, leveling agent, substrate wetting agent, deformer, adhesion promoter and water can be added to form single-component or two-component clear coat. The transparent, heat-insulating, UV-blocking coating described in the present invention can be applied directly on various transparent materials, such as glass, polycarbonate, organic glass, polystyrene, polyester, and so on. The transparent, heat-insulating, UV-blocking coating described in the present invention can be casted on the surface of materials through blade coating, curtain coating, and spray coating processes to endow the covered materials with UV blocking and infrared shielding properties. Examples Example 1 Water-based, heat insulting, UV blocking dispersion Wetting dispersant (Disperbyk-190) and Hyperdispersant (Hyperdisper-5410) were mixed uniformly with water first and fed into a sand mill. ATO and TiO2 powders were added slowly into the as-prepared aqueous solution afterward. Then the powders were grinded in sand mill for 4h to obtain aqueous dispersion with average particle size of around 90 nm. The detailed formulation of the dispersion is illustrated as follows in weight percentage: Antimony tin oxide 25 TiO 2 15 Wetting dispersant 4 Hyperdispersant 4 Water 52 Example 2 Alcohol-based, heat insulting, UV blocking dispersion Wetting dispersant (Disperbyk-160) and Hyperdispersant (Hyperdisper-5410) were mixed uniformly with ethanol first and fed into a sand mill. ATO and TiO 2 powders were added slowly into the as-prepared solution afterward. Then the powders were grinded in sand mill for 8h to obtain dispersion with average particle size of around 90 nm. The detailed formulation of the dispersion is illustrated as follows in weight percentage: Antimony tin oxide 25 TiO 2 10 Wetting dispersant 4 Hyperdispersant 4 Ethanol 57 Example 3 Solvent-based, heat insulting, UV blocking dispersion Wetting dispersant (Disperbyk-161) and Hyperdispersant (BSK 32800SH) were mixed uniformly with xylene first and fed into a sand mill. ATO and TiO 2 powders were added slowly into the as-prepared solution afterward. Then the powders were grinded in sand mill for 8h to obtain dispersion with average particle size of around 100 nm. The detailed formulation of the dispersion is illustrated as follows in weight percentage: Indium tin oxide 25 Fe 2 0 3 10 Wetting dispersant 4 Hyperdispersant 5 Xylene 56 Example 4 Water-based, transparent, heat insulting, UV blocking coating The components listed below were mixed uniformly by a high-speed disperser to obtain clear binder. Subsequently, as-prepared binder was mixed with the water-based dispersion described in example 1 at the weight ratio of 100 to 40. Afterward, a 10 [tm thick transparent coating was casted on glass out of as-produced mixture, which has the visible light transmittance of 73%, solar energy transmittance of 42%, and UV light transmittance of 8%. Water borne acrylic/polyurethane dispersion 80 Dipropylene Glycol Monomethyl Ether 6 Water 11 Deformer (BYK-019) 0.9 Thickener (RM-8W) 1.5 Wetting agent (H- 140) 0.6 Example 5 Alcohol-based, transparent, heat insulting, UV blocking coating The components listed above were mixed uniformly by a high-speed disperser. Afterward, the paint was casted on glass substrate, which was dried at ambient temperature or at 80 C 120 C for 30min to obtain a 10 [tm thick, transparent heat insulating coating with the hardness of 3H, visible light transmittance of 68%, solar energy transmittance of 38%, and UV light transmittance of 11%. Silicone resin (solid content 40%) 60 Dispersion (Example 2) 40 Deformer(BYK-028) 0.4 Example 6 Solvent-based, transparent, heat insulting, UV blocking coating The components listed below were mixed uniformly by a high-speed disperser. Afterward, a 10 [tm thick, transparent heat insulating coating was casted on transparent polycarbonate substrate by spray coating. The key performance of such produced coating includes, hardness of 2H, visible light transmittance of 73%, solar energy transmittance of 40%, and UV light transmittance of 14%. Acrylic resin 50 Xylene 20 Dispersion (Example 3) 30 Leveling agent (BYK-302) 0.5 Deforner (BY K-071 ) 0.5

Claims (8)

1. A transparent, heat insulating, UV blocking coating comprising, by weight percentage, 20% to 50% film formation materials, 10% to 50% heat insulting and UV blocking dispersion, 0.1% to 1% additives and 15% to 40% solvent.
2. The transparent, heat insulating, UV blocking coating of claim 1, wherein the heat insulating and UV blocking dispersion are derived from heat insulating powders, which include ATO, ITO, LaB 6 , doped V0 2 , etc, and UV blocking powders, which include TiO 2 , ZnO, Fe 2 0 3 . Nano TiO 2 are preferred as UV blocking powders. Fe and Mn doped nano TiO 2 are more preferred as UV blocking powders. The particle size of the powders dispersed in the dispersion is in the range of 10 nm to 200 nm. Preferred particle size is in the range from 10 nm to 100 nm.
3. The nanodispersion of claim 2, wherein the continuous phase of the dispersion can be either water or organic solvent, which is preferred to be selected from ethanol, butanol, xylene, ethyl acetate and the mixture thereof. The solid content is preferred to be 10 wt% ~ 40 wt%. 3. The transparent, heat insulating, UV blocking coating of claim 1, wherein the film formation materials are resins that can attach to glass and form transparent films on glass surfaces at ambient temperature and high temperature, with or without curing agent.
4. The resin of claim 3 are selected from (meth)acrylic polymer, polyurethane, alkyd resin, amino resin, polyester, silicone resin, silicate, and water-based dispersions or latexes of them.
The resin is preferred to be one or a mixture out of (meth) acrylic polymer, polyurethane, amino resin, silicone resin and their dispersions or latexes.
6. The solvent of claim 1 can be water or organic solvent, such as ethanol, butanol, xylene, ethyl acetate, and so on.
7. The transparent, heat insulating, UV blocking coating of claim 1, wherein the additives include leveling agent, deformer, film formation materials, wetting agent, thickener.
8. The transparent, heat insulating, UV blocking coating of claim 1, wherein the solvent can be water or organic solvent, such as ethanol, butanol, xylene, ethyl acetate, and so on.
AU2014100870A 2014-08-04 2014-08-04 Transparent, heat-insulting, UV-blocking coatings Ceased AU2014100870A4 (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107936790A (en) * 2017-10-30 2018-04-20 合肥林邦门业有限公司 A kind of timber Water-borne Alkyd Coatings preparation method
CN108440905A (en) * 2018-03-01 2018-08-24 合肥利裕泰玻璃制品有限公司 A kind of wear resistant heat preserving fire prevention resistance vitaglass protective film and preparation method thereof
CN108531025A (en) * 2018-03-01 2018-09-14 珠海市美筑新材料有限公司 High temperature resistant antimildew and antibacterial type nanometer water baking vanish and preparation method thereof
CN109679469A (en) * 2018-12-31 2019-04-26 新沂市中诺新材料科技有限公司 A kind of preparation method of environmentally friendly cold coating
CN112159600A (en) * 2019-06-16 2021-01-01 南京任氏环保材料有限公司 Method for manufacturing reflective heat-insulation colored sand

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107936790A (en) * 2017-10-30 2018-04-20 合肥林邦门业有限公司 A kind of timber Water-borne Alkyd Coatings preparation method
CN108440905A (en) * 2018-03-01 2018-08-24 合肥利裕泰玻璃制品有限公司 A kind of wear resistant heat preserving fire prevention resistance vitaglass protective film and preparation method thereof
CN108531025A (en) * 2018-03-01 2018-09-14 珠海市美筑新材料有限公司 High temperature resistant antimildew and antibacterial type nanometer water baking vanish and preparation method thereof
CN108531025B (en) * 2018-03-01 2020-04-24 珠海市美筑新材料有限公司 High-temperature-resistant mildew-proof antibacterial nano water-based baking paint and preparation method thereof
CN109679469A (en) * 2018-12-31 2019-04-26 新沂市中诺新材料科技有限公司 A kind of preparation method of environmentally friendly cold coating
CN109679469B (en) * 2018-12-31 2021-11-26 益帆涂料(无锡)有限公司 Preparation method of environment-friendly resin coating
CN112159600A (en) * 2019-06-16 2021-01-01 南京任氏环保材料有限公司 Method for manufacturing reflective heat-insulation colored sand

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