JP2014529517A - Waterproof coating system for reflecting solar radiation and aqueous coating for forming decorative and reflective layers in the coating system - Google Patents

Abstract

The coating system optionally includes a base layer on the substrate and a reinforcing layer on the base layer, a white reflective and waterproof layer on the substrate or on the reinforcing layer, and a decorative and reflective layer on the white reflective and waterproof layer Waterproof coating system for reflecting solar radiation, wherein the decoration and reflective layer comprises a colored infrared reflective pigment. An aqueous coating for forming decorative and reflective layers in a coating system comprising an acrylic polymer, a colored infrared reflective pigment, and a UV crosslinker. The coating system is particularly capable of reflecting solar radiation from water penetration with high efficiency and cure, has strong stain resistance and good weather resistance, has strong adhesion to various substrates, and It also brings a variety of colors for selection. The aqueous coating can be easily applied and is environmentally friendly.

Description

  The present invention relates to a waterproof coating system for reflecting solar radiation, and an aqueous coating for forming decorative and reflective layers in the coating system comprising an acrylic polymer, a colored infrared reflective pigment and a UV crosslinker.

Background Art Solar radiation reaching the Earth's surface provides the necessary conditions for human survival and daily life, while at the same time it is responsible for raising the internal temperature of buildings, such as homes, offices and factories. And its outer surface provides heat absorption from solar radiation. In order to lower the internal temperature of the building, it requires the use of cooling facilities, such as shower devices, air conditioners and ventilators, and consumes a considerable amount of energy.

  The application of a coating that can effectively reflect solar radiation onto the exterior of buildings, such as homes, offices and factories, is an important way to lower its internal temperature. Apparently, the reflectivity of the coatings for solar radiation is higher, their curing to lower the internal temperature of the building is better and further obviously extends the useful life of the building.

  US Pat. No. 5,434,009 describes a first layer for forming an asphalt substrate for lamination; at least one second layer bonded to the first layer, wherein the second layer is applied to the base asphalt layer An acrylic acid polymer, and a cross-linking accelerating metal complex with the acrylic acid polymer in an amount sufficient to form a continuous film; and a third layer (where the third layer is bonded to the second layer) A roofing laminate comprising: an acrylic acid polymer and containing a UV blocker.

  European Patent Specification EP 1160299 A1 discloses an improved exterior elastomeric coating composition, said coating composition comprising an organic binder having a Tg of less than −20 ° C., and at least one organic additive. Wherein the improvement comprises replacing at least a portion of the at least one organic additive with a solid particulate organic polymer having a Tg greater than 70 ° C.

  Chinese Patent Specification CN 101319121 A discloses a multifunctional, high-efficiency and thermal insulation coating comprising 16-20 wt% rutile titanium dioxide, 3-5 wt% infrared reflectivity, and elastic Contains 35-40% by weight of acrylic emulsion.

  Chinese Patent Specification CN 101344533 discloses a water-based, elastic, heat-insulating and power-saving coating comprising 200-250 parts by weight of an elastic emulsion, 20-35 parts by weight of infrared reflectivity, and titanium dioxide. Contains 40-60 parts by weight. During the process of application of the water-based, elastic, heat-insulating and power-saving coating on the wall, the primer is first coated, and the water-based, elastic, heat-insulating and power-saving coating is coated two or three times, and finally With a transparent finish.

  US Patent Specification US2005261407 A1 provides a coating having an initial energy efficiency of 0.65 or more for low slope roofs or an initial energy efficiency of 0.25 or more for steep roofs with polymer binder and polymer carrier A high energy efficiency, reflectance, and durable top coating composition is disclosed that contains a mixture with an effective amount of a pigment that can be used in a factory during the manufacture of a roofing membrane. Applied.

  US Patent Specification US 2007051291 A1 discloses a roof membrane having high solar heat reflection, which includes a bitumen base sheet, a secondary layer comprising a reinforcing material, and a solar heat reflective top layer.

  Said prior art products cannot simultaneously reflect solar radiation and effectively prevent water from penetrating, in particular they cannot do them effectively for long periods of time, and their With respect to color, white stands out against other colors. Thus, they cannot effectively meet consumer demands.

SUMMARY OF THE INVENTION In view of the prior art, the present invention performs extensive and in-depth investigations in the technical field of waterproof coatings for solar radiation reflection, reflects solar radiation with high efficiency, and penetrates water. It is an object to obtain a coating or coating system that can effectively prevent this from occurring. Said object is found to be achieved by a white reflective and waterproof layer and a coating system comprising a decorative and reflective layer on the reflective and waterproof layer, wherein the decorative and reflective layer comprises a colored infrared reflective pigment. Completing the present invention is exactly the discovery that relies on the inventor.

  The present invention seeks to provide a waterproof coating system for reflecting solar radiation.

  The present invention further aims to provide an aqueous coating for forming decorative and reflective layers in a coating system.

In one aspect, the present invention provides a waterproof coating system for reflecting solar radiation, the coating system comprising:
Optionally, a base layer on the substrate and a reinforcing layer on the base layer,
A white reflective and waterproof layer on the substrate or reinforcing layer, and a decorative and reflective layer on the white reflective and waterproof layer, wherein the decorative and reflective layer includes a colored infrared reflective pigment.

In another aspect, the present invention provides an aqueous coating for forming decorative and reflective layers in a coating system, the aqueous coating comprising:
Acrylic polymer,
Contains a colored infrared reflective pigment and a UV crosslinker.

  The coating system according to the present invention is highly reflective to solar radiation and efficient waterproofing; it has high contamination resistance and good weather resistance, thus clearly from decay over a specified time Prevents the high reflectivity of the coating system to solar radiation; has strong adhesion to various substrates, thus leading to the result that a primer is no longer needed during its application; white reflective and waterproof layers and decorative and reflective layers Establish a good balance between tensile strength and elongation at break; and provide diversified colors for selection. The aqueous coating to form the coating system can be easily applied and is environmentally friendly.

  These other objects, features and advantages of the present invention will become apparent to those skilled in the art after considering the present invention as a whole.

1 shows a coating system according to one embodiment of the present invention. FIG. 3 shows a coating system according to another embodiment of the present invention.

DETAILED DESCRIPTION OF THE INVENTION According to one embodiment of the present invention, a waterproof coating system for reflecting solar radiation includes a white reflective and waterproof layer, and a decorative and reflective layer on the white reflective and waterproof layer. The decorative and reflective layer includes a colored infrared reflective pigment. The coating system is suitable, for example, in the seamless area of the roof.

  In accordance with another embodiment of the present invention, a waterproof coating system for reflecting solar radiation includes a base layer on a substrate, a reinforcing layer on the base layer, a white reflective and waterproof layer on the reinforcing layer, and a white reflective and A decorative and reflective layer is included on the waterproof layer, wherein the decorative and reflective layer includes a colored infrared reflective pigment. The coating system is suitable, for example, for other substrates that need reinforcement in the seam area of the roof or due to its insufficient mechanical strength.

  FIG. 1 illustrates a coating system 10 intended for a seamless area of a roof according to the present invention, which is decorated with a white reflective and waterproof layer 12 on a substrate 11 and a white reflective and waterproof layer 12. And a reflective layer 13.

  FIG. 2 illustrates a coating system 20 intended for a roof seam 26 according to the invention, which comprises a base layer 22 on a substrate 21, a reinforcing layer 23 on the base layer 22, and a white reflection on the reinforcing layer 23. And a decorative and reflective layer 25 on the white reflective and waterproof layer 24.

  By comparing FIG. 1 and FIG. 2, depending on their different application environment, both the base layer on the substrate and the reinforcing layer on the base layer are optional.

  The coating system according to the invention is suitable for various substrates such as metal substrates, colored steel plates, concrete, asphalt substrates or PVC substrates.

  The optional base layer in the coating system according to the present invention may be any suitable base layer with good adhesion to the substrate and is known to those skilled in the art. For example, it may be formed from a polyester coating or a polyurethane coating. In view of affordable applications, the base layer is made of the same material as that of the white reflective and waterproof layer. For example, when the white reflective and waterproof layer is formed from an aqueous coating comprising an acrylic polymer and a white infrared reflective pigment as described below, the base layer is also formed from the aqueous coating. In this case, in order to reduce costs, the base layer is also formed from the aqueous coating, but does not have a white infrared reflective pigment, in particular titanium dioxide.

  The optional reinforcing layer in the coating system according to the invention is used, for example, to enhance the mechanical strength of roof seams, preferably a non-woven fabric. The fibers include, for example, natural fibers such as wood and cotton; synthetic fiber such as polyester, nylon, polypropylene, polyvinylidene fluoride, ethylene / tetrafluoroethylene copolymer, polyethylene terephthalate, polypropylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, poly It may be (meth) acrylate, polyetherketone; inorganic material fibers such as glass fibers or metal fibers; or combinations thereof. The reinforcing layer is advantageously a nonwoven of synthetic fibers, metal fibers or a combination thereof, more preferably a nonwoven of polyester fibers or glass fibers. Before the base layer is fully solidified, a nonwoven fabric of fibers is placed on the base layer to form a reinforcing layer.

  In the coating system according to the present invention, when the base layer and the reinforcing layer are not used, the white reflective and waterproof layer is directly on the substrate, and when the base layer and the reinforcing layer are used, the white reflective and waterproof layer is , On the reinforcement layer.

  The white reflective and waterproof layer in the coating system according to the invention serves to avoid water, for example rainwater, from seepage, and at the same time can also efficiently reflect solar radiation, in particular infrared radiation. For this reason, the white reflective and waterproof layer in the coating system according to the present invention comprises a white infrared reflective pigment. The white infrared reflective pigment is preferably titanium dioxide, zinc oxide, zinc sulfide or a mixture thereof, more preferably rutile titanium dioxide. In the white reflective and waterproof layer, the white infrared reflective pigment is 1 to 50% by weight, preferably 2 to 20% by weight, based on the white reflective and waterproof layer.

  The white reflective and waterproof layer in the coating system of the present invention is formed from a coating comprising an acrylic polymer and a white infrared reflective pigment, preferably an aqueous coating comprising an acrylic polymer and a white infrared reflective pigment.

  Acrylic polymers are, for example, acrylic homopolymers or copolymers or mixtures thereof, such as homopolymers of acrylic acid, acrylate, methacrylic acid or methacrylate; or acrylate / acrylate copolymers, methacrylate / methacrylate copolymers; or two or more acrylic acids, acrylates , A copolymer formed from methacrylic acid, methacrylate and styrene; or a mixture thereof. The acrylic polymer is advantageously an acrylate / acrylate copolymer, methacrylate / methacrylate copolymer, acrylate / styrene copolymer, methacrylate / styrene copolymer, acrylate / methacrylate / styrene copolymer, or mixtures thereof. Advantageously, the acrylic polymer is a C1-8 alkyl acrylate / C1-8 alkyl acrylate copolymer, a C1-8 alkyl methacrylate / C1-8 alkyl methacrylate copolymer, a C1-8 alkyl acrylate / styrene copolymer, a C1-8 alkyl methacrylate / styrene copolymer. C1-8 alkyl acrylate / C1-8 alkyl methacrylate / styrene copolymer, or mixtures thereof; preferably C1-4 alkyl acrylate / C1-4 alkyl acrylate copolymer, C1-4 alkyl methacrylate / C1-4 alkyl methacrylate Copolymer, C1-4 alkyl acrylate / styrene copolymer, C1-4 alkyl methacrylate / styrene copolymer, C1-4 alkyl acrylate / 1-4 alkyl methacrylate / styrene copolymer, or mixtures thereof. More specifically, the acrylic polymer may be, for example, a butyl acrylate / styrene copolymer or a butyl acrylate / methyl methacrylate / styrene copolymer.

  Acrylic polymers are commercially available and can be synthesized by conventional methods known to those skilled in the art. It can be used, for example, in the form of polymer solid particles and also in the aqueous coating in the form of an aqueous polymer dispersion.

  Specific examples of commercially available aqueous dispersions of acrylic polymers include, but are not limited to, Acronal® Flex SC 138 ap, Acronal® 405 ap, Acronal® GS 409 ap from BASF. , Acronal® S 533 and Acronal® NX 3587; Maincote® PR-71K from Dow Chemical Company, PRIMAL® EC-1791 and Elsine 8556; Revacl from Synthomer And Revarcyl 245.

  Advantageously, a mixture of one or more acrylic polymers is used in the aqueous coating, for example a mixture of PRIMAL® EC-1791 and Acronal® NX 3587.

  The acrylic polymer is 22.5-32.5% by weight based on the total amount of the aqueous coating.

  The white infrared reflective pigment is advantageously titanium dioxide, zinc oxide, zinc sulfide or mixtures thereof. Titanium dioxide includes rutile titanium dioxide and anatase titanium dioxide and is commercially available or can be prepared by conventional methods known to those skilled in the art. The white infrared reflective pigment is more preferably rutile titanium dioxide.

  With respect to pigments, the aqueous coating contains only white infrared reflective pigments, preferably only titanium dioxide, zinc oxide, zinc sulfide or mixtures thereof, eg only rutile carbon dioxide. This is because the reflective and waterproof layer is white.

  The white infrared reflective pigment may have a particle size of, for example, 0.2 to 0.3 μm.

  The white infrared reflective pigment is 0.5 to 25% by weight, preferably 1 to 10% by weight, based on the total amount of the aqueous coating.

In addition to the acrylic polymer and white infrared reflective pigment, the aqueous coating may also include the following other components:
Dispersants, for example, TEGO® Dispers 715 W and TEGO® Wet KL 245 from Evonik Tego Chemie GmbH;
Antifoaming agents such as TEGO® Foamex 1488 from Evonik Tego Chemie GmbH; BYK® 021 and BYK® 024 from BYK Additives &Instruments; FOA® from FOGST® from CognisST 8034 and FOAMMASTER® NXZ;
Fillers such as barium sulfate, calcium carbonate, talc powder, kaolin, mica powder, aluminum silicate;
Bactericides such as DeuAdd MB-11 and Deu Add MB-16 from Elementis Specialties; SKANE® M-8 from Dow Chemical Company;
Thickeners such as HEC ER5200 and RM-2020 from Dow Chemical Company; BYK® 420 and BYK® 428 from BYK Additives &Instruments; Trade mark from Evonik Tego Chemie GmbH ) ViscoPlus 3030; and pH adjusters such as aqueous ammonia; AMP-95 from Dow Chemical Company; NaOH.

  The amount of the other component in the aqueous coating is a normal amount.

  The aqueous coating is manufactured by mixing and polishing acrylic polymer, white infrared reflective pigment, water and other optional ingredients, instead of first mixing acrylic polymer, water and other optional ingredients. And polishing and mixing the resulting mixture from the polishing with a white infrared reflective pigment. During the manufacturing process, the final pH values of the aqueous coatings are adjusted within the range of 7.5 to 10.5 by adjusting the amount of pH adjusting agent used in them.

  The aqueous coating is applied on the base layer or reinforcing layer by conventional methods such as knife coating, roller coating, brushing, spraying, and cured by self-crosslinking under environmental conditions to produce a white reflective and waterproof layer. Can be obtained.

  When the base layer and the reinforcing layer are not used, the white reflective and waterproof layer has a dry film thickness of 0.2 to 1.5 mm, preferably 0.4 to 0.6 mm. When the base layer and the reinforcing layer are used, and the base layer is manufactured from the same material as that of the white reflective and waterproof layer, the dry thickness of the base layer, the reinforcing layer, and the dry film of the white reflective and waterproof layer The total thickness is 1-2 mm.

  The white reflective and waterproof layer has a tensile strength of 1-4 MPa and an elongation at break of 100-400%.

  On the other hand, the white reflective and waterproof layer formed from the water-based coating has strong adhesion to various substrates, for example generally 300-2000 N / m, and therefore no longer requires a primer during its application. Results in no.

  The decorative and reflective layer in the coating system of the present invention has a decorative, eg colored coating system, eg gray or dark green effect, and can also efficiently reflect solar radiation, especially infrared radiation. . For this purpose, the decorative and reflective layer in the coating system according to the invention comprises a colored infrared reflective pigment.

  Based on their specific colors, infrared reflective pigments can be classified as white infrared reflective pigments and colored infrared reflective pigments, where colored infrared reflective pigments mean their color and can be any color except white. For example, black infrared reflective pigment.

  The colored infrared reflective pigment is advantageously chromium iron oxide, cobalt aluminum oxide, cobalt chromium aluminum oxide, manganese antimony titanium oxide, iron zinc titanium oxide, iron aluminum titanium oxide, chromium antimony titanium oxide, Nickel antimony titanium oxide, cobalt chromium zinc titanium oxide, cobalt nickel zinc titanium oxide, iron chromium zinc titanium oxide, cobalt chromium manganese zinc aluminum oxide or a mixture thereof. With respect to the gray decorative and reflective layer, the colored infrared reflective pigment is 2-30% by weight with respect to the decorative and reflective layer. For dark green decorative and reflective layers, the colored infrared reflective pigment is 2-20% by weight based on the decorative and reflective layer.

  The decorative and reflective layer in the coating system of the present invention is formed from a coating comprising an acrylic polymer, a colored infrared reflective pigment and a UV crosslinker, preferably from an aqueous coating comprising an acrylic polymer, a colored infrared reflective pigment and a UV crosslinker. The

To this end, the present invention further provides an aqueous coating for forming decorative and reflective layers in a coating system, the aqueous coating comprising:
Acrylic polymer,
Contains a colored infrared reflective pigment and a UV crosslinker.

  Acrylic polymers are, for example, acrylic homopolymers or copolymers or mixtures thereof, such as homopolymers of acrylic acid, acrylate, methacrylic acid or methacrylate; or acrylate / acrylate copolymers, methacrylate / methacrylate copolymers; or two or more acrylic acids, acrylates , A copolymer formed from methacrylic acid, methacrylate and styrene; or a mixture thereof. The acrylic polymer is advantageously an acrylate / acrylate copolymer, methacrylate / methacrylate copolymer, acrylate / styrene copolymer, methacrylate / styrene copolymer, acrylate / methacrylate / styrene copolymer, or mixtures thereof. Advantageously, the acrylic polymer is a C1-8 alkyl acrylate / C1-8 alkyl acrylate copolymer, a C1-8 alkyl methacrylate / C1-8 alkyl methacrylate copolymer, a C1-8 alkyl acrylate / styrene copolymer, a C1-8 alkyl methacrylate / styrene copolymer. C1-8 alkyl acrylate / C1-8 alkyl methacrylate / styrene copolymer, or mixtures thereof; preferably C1-4 alkyl acrylate / C1-4 alkyl acrylate copolymer, C1-4 alkyl methacrylate / C1-4 alkyl methacrylate Copolymer, C1-4 alkyl acrylate / styrene copolymer, C1-4 alkyl methacrylate / styrene copolymer, C1-4 alkyl acrylate / 1-4 alkyl methacrylate / styrene copolymer, or mixtures thereof. More specifically, the acrylic polymer may be, for example, a butyl acrylate / methyl methacrylate / styrene copolymer.

  Acrylic polymers are commercially available and can be synthesized by conventional methods known to those skilled in the art. It can be used, for example, in the form of polymer solid particles and also in the aqueous coating in the form of an aqueous polymer dispersion.

  Specific examples of commercially available aqueous dispersions of acrylic polymers include, but are not limited to, Acronal® Flex SC 138 ap, Acronal® 405 ap, Acronal® GS 409 ap from BASF. , Acronal® S 533 and Acronal® NX 3587; PRIMAL® EC-1791 from Dow Chemical Company; Revacryl 100 from Synthomer.

  Advantageously, a mixture of one or more acrylic polymers, such as a mixture of Acronal® S533 and Revacryl 100, is used in the aqueous coating.

  The acrylic polymer is 20 to 35% by weight, preferably 22.5 to 32.5% by weight, based on the total amount of the aqueous coating.

  The colored infrared reflective pigment is advantageously chromium iron oxide, cobalt aluminum oxide, cobalt chromium aluminum oxide, manganese antimony titanium oxide, iron zinc titanium oxide, iron aluminum titanium oxide, chromium antimony titanium oxide, Nickel antimony titanium oxide, cobalt chromium zinc titanium oxide, cobalt nickel zinc titanium oxide, iron chromium zinc titanium oxide, cobalt chromium manganese zinc aluminum oxide or a mixture thereof. For example, specific examples thereof may be Xfast (R) Black EH 0408 (0095) from BASF, Black 30C933 and Black 30C965 from Shepherd Color Company.

  Depending on the various desired colors of the decorative and reflective layers, the amount of colored infrared reflective pigment in the aqueous coating can vary within a relatively wide range. For gray decorative and reflective layers, the amount of colored infrared reflective pigment in the aqueous coating is 1-15% by weight. For dark green decorative and reflective layers, the amount of colored infrared reflective pigment in the aqueous coating is 1-10% by weight.

  In addition to colored infrared reflective pigments, white infrared reflective pigments can also be used in the aqueous coating. For example, when the decorative and reflective layer is gray, the aqueous coating includes titanium dioxide and black infrared reflective pigment.

  In addition to the colored infrared reflective pigment, the aqueous coating to form a decorative and reflective layer in the coating system may include other pigments, such as Bengala and iron yellow for reasons of color matching and pigment hiding power. Depending on the various colors desired of the decorative and reflective layers, the amount of other pigments in the aqueous coating may be determined by one skilled in the art.

  Any suitable UV crosslinker may be used in the aqueous coating to form the decorative and reflective layer, and the UV crosslinker used is preferably benzophenone, benzophenone substituted by C1-3 alkyl, or they It is a mixture of Specific examples of benzophenone substituted by C1-3 alkyl include, but are not limited to, 2-methylbenzophenone, 3-methylbenzophenone, 4-methylbenzophenone, 4-ethylbenzophenone, 4-propylbenzophenone, 4-methyl- 4'-methylbenzophenone, 4-methyl-4'-ethylbenzophenone, 4-ethyl-4'-ethylbenzophenone. A specific example of a UV crosslinker used is Esacure TZM from Lamberti Spa, which consists of about 50% benzophenone and about 50% 4-methylbenzophenone. The UV crosslinking agent is 0.1 to 2% by weight, preferably 0.3 to 1.5% by weight, based on the total amount of the aqueous coating.

In addition to the acrylic polymer, the colored infrared reflective pigment, and the UV crosslinker, the aqueous coating may also include the following other components:
Dispersants, such as TEGO® Dispers 715 W and TEGO® Wet KL 245 from Evonik Tego Chemie GmbH; their amounts are 0.2-1% by weight with respect to the aqueous coating;
Antifoaming agents such as TEGO® Foamex 1488 from Evonik Tego Chemie GmbH; BYK® 021 and BYK® 024 from BYK Additives &Instruments; FOA® from FOGST® from CognisST 8034 and FOAMASTER® NXZ; their amount is 0.2-1% by weight with respect to the aqueous coating;
Fillers such as barium sulfate, calcium carbonate, talc powder, kaolin, mica powder, aluminum silicate; their amount is 20-40% by weight, based on the aqueous coating;
Bactericides such as DeuAdd MB-11 and Deu Add MB-16 from Elementis Specialties; SKANE® M-8 from Dow Chemical Company; 5% by weight;
Thickeners such as HEC ER5200 and RM-2020 from Dow Chemical Company; BYK® 420 and BYK® 428 from BYK Additives &Instruments; Trade mark from Evonik Tego Chemie GmbH ) ViscoPlus 3030; their amount is 0.2-1.5% by weight with respect to the aqueous coating; and pH adjusters such as aqueous ammonia; AMP-95 from Dow Chemical Company; NaOH; Depending on the desired final pH value, these amounts are usually 0.1-1% by weight, based on the aqueous coating.

  The aqueous coating is manufactured by mixing and polishing acrylic polymer, colored infrared reflective pigment, optionally white infrared reflective pigment, optionally other pigments, UV crosslinker, water and other optional ingredients, instead First, the acrylic polymer, UV crosslinker, water and other optional ingredients are mixed and polished, and the mixture obtained from the polishing and a colored infrared reflective pigment, optionally a white infrared reflective pigment and optionally other Manufactured by mixing with pigments.

  The aqueous coating is applied on the white reflective and waterproof layer by conventional methods such as knife coating, roller coating, brushing, spraying and UV curing under environmental conditions to obtain a decorative and reflective layer Can do.

  The decorative and reflective layer has a dry film thickness of 0.02 to 0.3 mm, preferably 0.08 to 0.1 mm.

  The decorative and reflective layer has a tensile strength of 1-4 MPa and an elongation at break of 100-400%.

  On the other hand, the decorative and reflective layer formed from the water-based coating generally exhibits a stain resistance of 2 or less grade by colorimetric method, has good weather resistance, and without any significant change Under 1000 hours of accelerated aging tests can be successfully passed, thus clearly avoiding the high reflectivity of the coating system for solar radiation over a specified time from decay.

  The coating system according to the invention is suitable for the roofs and walls of buildings such as houses, offices and factories, especially in hot and long rainy places.

EXAMPLES The invention is specifically described below with reference to examples, which are not intended to limit the protection scope of the invention in any way.

  The solar radiation reflection of the coating system was tested according to GJB 2502-1996 (210); the tensile strength and elongation at break of coating system water impervious, white reflective and waterproof layers and decorative and reflective layers according to GB / T 16777-1997. Test; adhesion of coating system to substrate tested according to GB / T 2790-1995; stain resistance of coating system tested according to GB / T 9780; and weather resistance of coating system according to GB / T 1865-1997 test.

  Titanium dioxide used in the following examples and comparative examples has a particle size of 0.2 to 0.3 μm.

Example 1
The formation of an aqueous coating to form a white reflective and waterproof layer in the coating system is shown in Table 1 below, where the aqueous coating has a pH value of 9.5.

  The formation of an aqueous coating to form a gray decorative and reflective layer in the coating system is shown in Table 2 below.

At a temperature of 32 ° C. and a relative humidity of 20%, the aqueous coating 1 is sprayed on colored steel plates (colored with polyester) in an amount of 0.82 kg / m ² and cured by self-crosslinking under environmental conditions and dried. A white reflective and waterproof layer having a thickness of 400 μm is obtained; at a temperature of 32 ° C. and a relative humidity of 20%, the aqueous coating 2 is sprayed on the white reflective and waterproof layer in an amount of 0.28 kg / m ² and the environment UV cure under conditions to obtain a gray decorative and reflective layer having a dry film thickness of 100 μm; a coating system 1 according to the invention is obtained.

Example 2
The formation of an aqueous coating to form a white reflective and waterproof layer in the coating system is shown in Table 3 below, where the aqueous coating has a pH value of 9.5.

  The formation of an aqueous coating to form a dark green decorative and reflective layer in the coating system is shown in Table 4 below.

At a temperature of 23 ° C. and a relative humidity of 50%, the aqueous coating 3 is sprayed onto colored steel plates (colored with polyester) in an amount of 0.82 kg / m ² and cured by self-crosslinking under environmental conditions and dried. A white reflective and waterproof layer having a thickness of 400 μm is obtained; at a temperature of 23 ° C. and a relative humidity of 50%, the aqueous coating 4 is sprayed on the white reflective and waterproof layer in an amount of 0.28 kg / m ² and the environment UV cure under conditions to obtain a dark green decorative and reflective layer having a dry film thickness of 100 μm; a coating system 2 according to the invention is obtained.

Example 3
The formation of an aqueous coating to form a white reflective and waterproof layer in the coating system is shown in Table 5 below, where the aqueous coating has a pH value of 9.5.

  The aqueous coating for forming the dark green decorative and reflective layer in the coating system is shown in Table 4 above.

At a temperature of 32 ° C. and a relative humidity of 20%, the aqueous coating 5 is sprayed on colored steel plates (colored with polyester) in an amount of 1 kg / m ² and cured by self-crosslinking under environmental conditions to give a dry film thickness. A white reflective and waterproof layer having 500 μm is obtained; at a temperature of 32 ° C. and a relative humidity of 20%, the aqueous coating 4 is sprayed on the white reflective and waterproof layer in an amount of 0.56 kg / m ² and under environmental conditions To obtain a dark green decorative and reflective layer having a dry film thickness of 200 μm; a coating system 3 according to the invention is obtained.

Comparative Example 1
The aqueous coating for forming the white bottom coating in the comparative coating system is shown in Table 1 above.

  The aqueous coating formulation for forming the gray top coating in the comparative coating system is shown in Table 6 below.

At a temperature of 32 ° C. and a relative humidity of 20%, the aqueous coating 1 is sprayed on colored steel plates (colored with polyester) in an amount of 0.82 kg / m ² and cured by self-crosslinking under environmental conditions and dried. A bottom coating having a film thickness of 400 μm is obtained; at a temperature of 32 ° C. and a relative humidity of 20%, the aqueous coating 6 is sprayed onto the bottom coating in an amount of 0.28 kg / m ² and by self-crosslinking under environmental conditions Curing to obtain a gray top coating having a dry film thickness of 100 μm;

Comparative Example 2
The aqueous coating for forming the white bottom coating in the comparative coating system is shown in Table 3 above.

  The aqueous coating formulation for forming the dark green top coating in the comparative coating system is shown in Table 7 below.

At a temperature of 23 ° C. and a relative humidity of 50%, the aqueous coating 3 is sprayed onto colored steel plates (colored with polyester) in an amount of 0.82 kg / m ² and cured by self-crosslinking under environmental conditions and dried. A bottom coating having a film thickness of 400 μm is obtained; at a temperature of 23 ° C. and a relative humidity of 50%, the aqueous coating 7 is sprayed onto the bottom coating in an amount of 0.28 kg / m ² and UV-cured under environmental conditions. To obtain a dark green top coating having a dry film thickness of 100 μm;

Property Testing Coating systems 1 to 3 and comparative coating systems 1 to 2 were tested according to the standard and the results obtained are shown in Table 8 below.

Claims (24)

A waterproof coating system for reflecting solar radiation, the coating system comprising:
Optionally, a base layer on the substrate and a reinforcing layer on the base layer,
The coating system comprising a white reflective and waterproof layer on a substrate or reinforcing layer, and a decorative and reflective layer on the white reflective and waterproof layer, wherein the decorative and reflective layer comprises a colored infrared reflective pigment.   The colored infrared reflective pigment is chromium iron oxide, cobalt aluminum oxide, cobalt chromium aluminum oxide, manganese antimony titanium oxide, iron zinc titanium oxide, iron aluminum titanium oxide, chromium antimony titanium oxide, nickel antimony titanium. The coating system of claim 1, selected from the group consisting of oxide, cobalt chromium zinc titanium oxide, cobalt nickel zinc titanium oxide, iron chromium zinc titanium oxide and cobalt chromium manganese zinc aluminum oxide.   The coating system according to claim 1 or 2, wherein the decorative and reflective layer is formed from an aqueous coating comprising an acrylic polymer and a UV crosslinker.   The acrylic polymer is C1-8 alkyl acrylate / C1-8 alkyl acrylate copolymer, C1-8 alkyl methacrylate / C1-8 alkyl methacrylate copolymer, C1-8 alkyl acrylate / styrene copolymer, C1-8 alkyl methacrylate / styrene copolymer, C1. The coating system of claim 3, which is ˜8 alkyl acrylate / C 1-8 alkyl methacrylate / styrene copolymer, or a mixture thereof.   The coating system according to claim 3 or 4, wherein the UV crosslinking agent is benzophenone, benzophenone substituted by C1-3 alkyl, or a mixture thereof.   6. The process according to claim 3, wherein the UV crosslinking agent is 0.1 to 2% by weight, preferably 0.3 to 1.5% by weight, based on the total amount of the aqueous coating. The coating system described.   The coating system according to any one of claims 1 to 6, wherein the white reflective and waterproof layer includes a white infrared reflective pigment selected from the group consisting of titanium dioxide, zinc oxide and zinc sulfide.   The coating system according to claim 7, wherein the white reflective and waterproof layer comprises rutile titanium dioxide as a white infrared reflective pigment.   Coating system according to claim 7 or 8, wherein the white infrared reflective pigment is 1-50% by weight, preferably 2-20% by weight, based on the white reflective and waterproof layer.   10. A coating system according to any one of claims 1 to 9, wherein the white reflective and waterproof layer is formed from an aqueous coating comprising an acrylic polymer.   The acrylic polymer is C1-8 alkyl acrylate / C1-8 alkyl acrylate copolymer, C1-8 alkyl methacrylate / C1-8 alkyl methacrylate copolymer, C1-8 alkyl acrylate / styrene copolymer, C1-8 alkyl methacrylate / styrene copolymer, C1. The coating system of claim 10, which is ˜8 alkyl acrylate / C 1-8 alkyl methacrylate / styrene copolymer, or a mixture thereof.   12. A coating system according to any one of the preceding claims, wherein the decorative and reflective layer has a dry film thickness of 0.02 to 0.3 mm, preferably 0.08 to 0.1 mm.   The coating system according to claim 1, wherein the decorative and reflective layer has a tensile strength of 1 to 4 MPa and an elongation at break of 100 to 400%.   14. A coating system according to any one of the preceding claims, wherein the white reflective and waterproof layer has a dry film thickness of 0.2 to 1.5 mm, preferably 0.4 to 0.6 mm.   The coating system according to claim 1, wherein the white reflective and waterproof layer has a tensile strength of 1 to 4 MPa and an elongation at break of 100 to 400%.   The coating system according to any one of claims 1 to 15, wherein the reinforcing layer is a nonwoven fabric made of synthetic fiber, glass fiber, or a combination thereof.   The coating system according to any one of claims 1 to 16, wherein the base layer is made of the same material as that of the white reflective and waterproof layer.   The coating system according to any one of claims 1 to 17, wherein the substrate is a metal substrate, a colored steel plate, concrete, an asphalt substrate, or a PVC substrate. An aqueous coating for forming a decorative and reflective layer in the coating system, the aqueous coating comprising:
Acrylic polymer,
Said aqueous coating comprising a colored infrared reflective pigment and a UV crosslinker.   The acrylic polymer is C1-8 alkyl acrylate / C1-8 alkyl acrylate copolymer, C1-8 alkyl methacrylate / C1-8 alkyl methacrylate copolymer, C1-8 alkyl acrylate / styrene copolymer, C1-8 alkyl methacrylate / styrene copolymer, C1. 20. The aqueous coating of claim 19, which is -8 alkyl acrylate / C1-8 alkyl methacrylate / styrene copolymer, or a mixture thereof.   21. Aqueous coating according to claim 19 or 20, wherein the acrylic polymer is 20 to 35% by weight, preferably 22.5 to 32.5% by weight, based on the total amount of the aqueous coating.   The colored infrared reflective pigment is chromium iron oxide, cobalt aluminum oxide, cobalt chromium aluminum oxide, manganese antimony titanium oxide, iron zinc titanium oxide, iron aluminum titanium oxide, chromium antimony titanium oxide, nickel antimony titanium. The oxide according to any one of claims 19 to 21, selected from the group consisting of cobalt chromium zinc titanium oxide, cobalt nickel zinc titanium oxide, iron chromium zinc titanium oxide and cobalt chromium manganese zinc aluminum oxide. An aqueous coating as described in 1.   23. An aqueous coating according to any one of claims 19 to 22, wherein the UV crosslinker is benzophenone, benzophenone substituted by C1-3 alkyl, or mixtures thereof.   24. The process according to claim 19, wherein the UV crosslinking agent is 0.1 to 2% by weight, preferably 0.3 to 1.5% by weight, based on the total amount of the aqueous coating. The aqueous coating described.

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