Super-strong weather-resistant acrylic polyurethane coating, radiation refrigeration coating as well as preparation method and application of radiation refrigeration coating

Abstract

The invention relates to an ultra-strong weather-resistant acrylic polyurethane coating, a radiation refrigeration coating as well as a preparation method and application of the radiation refrigeration coating, and belongs to the technical field of radiation refrigeration coatings. In order to solve the problems that an existing daytime radiation refrigeration coating is poor in weather resistance and short in service life, the super-strong weather-resistant acrylic polyurethane coating is provided and comprises a component A and a component B. The component A comprises hydroxyl acrylic dispersion, pigment, auxiliaries, an ultraviolet light absorber, a light stabilizer and an antioxidant, and the component B comprises an isocyanate curing agent. The prepared acrylic polyurethane radiation refrigeration coating has the advantages of high reflection performance, obvious cooling and refrigeration effects, super-strong weather resistance, first-grade coating adhesive force, strong acid and alkali resistance and scrubbing resistance, can keep a stable refrigeration effect outdoors for a long time, and is suitable for weather conditions and complex environments of different regions. The acrylic polyurethane coating provided by the invention is simple in component, simple and convenient in preparation method and easy for industrial production.

Description

Technical Field

[0001] The invention belongs to the technical field of radiation cooling coatings, and in particular relates to a super-weather-resistant acrylic polyurethane coating, a radiation cooling coating, and a preparation method and application thereof. Background Art

[0002] Daylight Radiant Cooling (PDRC) is an emerging unpowered cooling technology that achieves temperatures below ambient by highly reflecting incident solar energy in the solar spectrum band (0.3–2.5μm) and emitting its own thermal infrared radiation energy in the atmospheric window band (8–13μm). Daylight radiant cooling does not require the use of any energy-consuming cooling medium or drive equipment, and relies entirely on natural energy for cooling, achieving energy conservation and consumption reduction, environmental protection and emission reduction, and reducing maintenance costs.

[0003] The application of daytime radiant cooling coatings in building cooling is mainly concentrated in the exterior walls and roofs of buildings, as well as the roofs and internal facilities of industrial buildings. It can effectively reduce the temperature of buildings by reflecting the radiant heat energy of sunlight, avoiding the accumulation and heating of solar heat on the surface, thereby making the indoor environment more comfortable.

[0004] However, the radiation cooling coating on the surface of the building is long-term affected by the harsh environment such as ultraviolet rays, acid and alkali, sand and dust, which leads to aging, cracking, discoloration, and reduced corrosion resistance and adhesion. Rainwater erosion may also remove some components on the surface of the coating, causing the coating to become thinner or ineffective. Coatings with poor weather resistance and short service life will increase the cost of maintenance and replacement. The inability to adapt to various complex environmental climates will also limit the wide application of the coating. Therefore, it is urgent to develop a radiation cooling coating with high spectral reflectivity and excellent weather resistance. Summary of the invention

[0005] In order to solve the problems of poor weather resistance and short service life of existing daytime radiation cooling coatings, the present invention provides a super weather-resistant acrylic polyurethane coating, a radiation cooling coating, and a preparation method and application thereof.

[0006] The technical solution of the present invention:

[0007] A super weather-resistant acrylic polyurethane coating, comprising component A and component B, wherein the mass ratio of component A to component B is 100:10-40;

[0008] The A component includes a base paint and an auxiliary agent.

[0009] The base paint comprises the following raw materials in parts by weight:

[0010] 30-60 parts of hydroxy acrylic dispersion,

[0011] Pigment 20-50 parts,

[0012] 5 to 20 parts of the first solvent,

[0013] and 2 to 10 parts of auxiliary agent;

[0014] The auxiliary agent includes the following raw materials in parts by weight:

[0015] 1 to 3 parts of ultraviolet absorber,

[0016] Light stabilizer 0.5-2 parts,

[0017] 0.5-1 part antioxidant

[0018] and 0.5 to 1 part of polar solvent;

[0019] The B component includes an isocyanate curing agent and a second solvent.

[0020] Furthermore, the hydroxy acrylic dispersion is a solvent-based resin, and its components include solvent-based acrylic resin I, solvent-based acrylic resin II and solvent-based acrylic resin III, and the mass ratio of the solvent-based acrylic resin I, solvent-based acrylic resin II and solvent-based acrylic resin III is 5-15:2-5:2-5; the solvent-based acrylic resin I is allnex resin SM515 / 70, the solvent-based acrylic resin II is allnex resin SM516 / 70, and the solvent-based acrylic resin III is one or a combination of two of Dongfeng resin HF-SI or Covestro resin BayhydrolA2542.

[0021] Furthermore, the pigment includes sunlight reflecting particles and atmospheric window band emitting particles, and the mass ratio of the sunlight reflecting particles to the atmospheric window band emitting particles is 3 to 8:1; the sunlight reflecting particles include visible light reflecting particles and near infrared reflecting particles, and the mass ratio of the visible light reflecting particles to the near infrared reflecting particles is 5 to 8:1;

[0022] The visible light reflecting particles are barium sulfate particles and / or titanium dioxide particles with a particle size distribution in the range of 0.1 to 1 μm, the near-infrared reflecting particles are calcium carbonate particles with a particle size distribution in the range of 1 to 10 μm, and the atmospheric window band emitting particles are one or a combination of silicon dioxide particles, silicon nitride particles or silicon carbide particles with a particle size distribution in the range of 2 to 20 μm.

[0023] Furthermore, the first solvent is one or a combination of xylene, toluene, butyl acetate, ethylene glycol monomethyl ether or trichloroethylene; the auxiliary agent includes a dispersant, a leveling agent, a defoamer, a preservative and an anti-settling agent, and the mass ratio of the dispersant, the leveling agent, the defoamer, the preservative and the anti-settling agent is 0.5-1.0:0.5-1.0:0.5-1.0:0.2-0.4:0.2-0.4; the dispersant is an unsaturated polycarboxylic acid polymer, triethylhexyl phosphoric acid, sodium dodecyl sulfate, methyl amyl alcohol, polyacrylamide The present invention relates to a novel silicone rubber composition comprising: a silicone rubber comprising: a silicone rubber having a silicone base, a silicone oil ...

[0024] Furthermore, the ultraviolet absorber is one or a combination of UVP-327 or UV-531 ultraviolet absorbers; the light stabilizer is a hindered amine light stabilizer, specifically one or a combination of LS-144, LS-292 or LS-123 light stabilizers; the antioxidant is one or a combination of BASF1010 or BASF168 antioxidants; the polar solvent is one or a combination of dimethylformamide, methanol, methyl isobutyl ketone, acetone or butyl ester.

[0025] Furthermore, the isocyanate curing agent in component B is one or a combination of Covestro N3300 curing agent, Wanhua PM200 curing agent or Tosoh HXR-100 curing agent; the second solvent is one or a combination of xylene, butyl ester, toluene, butyl acetate, ethylene glycol monomethyl ether or trichloroethylene; the mass ratio of the isocyanate curing agent to the second solvent is 5-10:2-10.

[0026] A method for preparing a super weather-resistant acrylic polyurethane coating comprises the following steps:

[0027] Step 1: Prepare base paint:

[0028] The hydroxy acrylic dispersion is mixed and stirred evenly with a dispersant, a defoamer, and a leveling agent at a first speed, the first solvent is added to the obtained mixed system, the mixture is mixed and stirred evenly at a second speed, and then visible light reflecting particles, near infrared reflecting particles, and atmospheric window band emitting particles are added, the mixing and stirring at the second speed is continued, and a preservative and an anti-settling agent are added during the stirring process, and the mixture is stirred evenly to obtain a base paint;

[0029] Step 2: Prepare auxiliary agents:

[0030] The ultraviolet absorber, the light stabilizer, the antioxidant and the polar solvent are mixed and stirred uniformly at a third speed to obtain an auxiliary agent;

[0031] Step 3: Prepare component A:

[0032] The base paint obtained in step 1 and the auxiliary agent obtained in step 2 are mixed and stirred at a fourth speed to obtain component A, and the component A is sealed and stored;

[0033] Step 4: Prepare component B:

[0034] The isocyanate curing agent and the second solvent are mixed and stirred at a fifth speed to obtain component B, and the component is sealed and stored;

[0035] Step 5: Prepare acrylic polyurethane coating:

[0036] When in use, the component A obtained in step 3 and the component B obtained in step 4 are evenly mixed to obtain the acrylic polyurethane coating.

[0037] Furthermore, the first speed is 200-250 r / min, the second speed is 300-450 r / min, the third speed is 300-350 r / min, the fourth speed is 350-450 r / min, and the fifth speed is 250-350 r / min.

[0038] A super weather-resistant acrylic polyurethane radiation cooling coating is obtained by coating the super weather-resistant acrylic polyurethane coating provided by the invention on a working surface by spraying, flow coating or brushing, and curing at room temperature. The super weather-resistant acrylic polyurethane radiation cooling coating has a thickness of 100 to 300 μm.

[0039] A super weather-resistant acrylic polyurethane radiant cooling coating is used in building cooling, industrial equipment cooling, outdoor equipment cooling or cold chain transportation.

[0040] Beneficial effects of the present invention:

[0041] The present invention introduces sunlight-reflecting particles and atmospheric window band-emitting particles of different particle sizes into acrylic polyurethane coatings, utilizes the characteristics that particles of different particle sizes have different reflection response capabilities at different wavelengths, realizes the superposition of scattering and emission capabilities by affecting different wavelengths, thereby obtaining a radiation cooling coating with high reflection performance, with a solar spectrum reflectivity of more than 90% and an atmospheric window emissivity, the maximum daily rooftop temperature reduction in hot weather is 19.9°C, the maximum indoor daily temperature reduction is 6.1°C, and the cooling effect is remarkable.

[0042] The acrylic polyurethane coating provided by the present invention can be applied to different construction surfaces such as plastic, wood, stone or metal by spraying, flow coating or brushing. The surface can be dried in 2 hours at noon in summer and completely dried in 24 hours. The radiant cooling coating obtained after drying has good flatness and strong adhesion on different types of substrates. The acrylic polyurethane coating of the present invention is applied to the surface of cement stone to form a coating, and a pull-out test is performed after complete curing. The data show that the pulling force required for the spindle to fall off reaches 10.5Mpa.

[0043] The acrylic polyurethane radiation refrigeration coating of the present invention has a product adhesion of level 1, good acid and alkali resistance, and a washability of up to 8,000 times. It can maintain a stable refrigeration effect and aesthetic appearance for a long time outdoors, reduce the frequency of maintenance and replacement, and has an outdoor service life of up to 5 to 6 years, thereby reducing the use cost of the radiation refrigeration coating. The super weather resistance of the acrylic polyurethane radiation refrigeration coating of the present invention enables it to adapt to the climatic conditions and complex environments of different regions, thereby improving its wide application.

[0044] The acrylic polyurethane coating provided by the invention has simple components, a simple preparation method and is easy for industrial production. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 The photos of the coatings obtained by applying the acrylic polyurethane coating prepared in Example 1 on different construction surfaces;

[0046] Figure 2 This is a UV-visible-near infrared spectral characteristic diagram of the acrylic polyurethane radiation cooling coating prepared in Example 1;

[0047] Figure 3 This is a test diagram of the outdoor cooling effect of the acrylic polyurethane radiant cooling coating prepared in Example 1;

[0048] Figure 4 This is a comparison chart of the anti-fouling performance test of the acrylic polyurethane radiant cooling coating prepared in Example 1;

[0049] Figure 5 This is a graph showing the results of the acid, alkali and salt resistance test of the acrylic polyurethane radiation cooling coating prepared in Example 1;

[0050] Figure 6 This is a physical picture of the pull-out test of the acrylic polyurethane radiant cooling coating prepared in Example 1 on a concrete stone;

[0051] Figure 7 This is a physical picture of the pull-out test of the acrylic polyurethane radiation cooling coating prepared in Example 1 on tinplate;

[0052] Figure 8This is a physical picture of the pull-out test of the acrylic polyurethane radiation cooling coating prepared in Example 1 on an aluminum plate;

[0053] Fig. 9 This is a physical picture of the washability test of the acrylic polyurethane radiation refrigeration coating prepared in Example 1. DETAILED DESCRIPTION

[0054] The technical solution of the present invention is further described below in conjunction with the embodiments, but it is not limited thereto. Any modification or equivalent replacement of the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention shall be included in the protection scope of the present invention. The process equipment or devices not specifically noted in the following embodiments are all conventional equipment or devices in the art. If not specifically specified, the raw materials used in the embodiments of the present invention can be obtained commercially; if not specifically specified, the technical means used in the embodiments of the present invention are all conventional means well known to those skilled in the art.

[0055] Example 1

[0056] This embodiment provides a super weather-resistant acrylic polyurethane coating and a preparation method thereof.

[0057] The acrylic polyurethane coating provided in this embodiment includes component A and component B, and the mass ratio of component A to component B is 100:20.

[0058] In this embodiment, component A includes a base paint and an auxiliary agent, wherein the base paint includes the following raw materials in parts by weight:

[0059] 55 parts of hydroxy acrylic dispersion,

[0060] 40 parts of pigment,

[0061] 5 parts of the first solvent xylene,

[0062] and 2.4 parts of auxiliary agent;

[0063] The auxiliary agent includes the following raw materials in parts by weight:

[0064] 1.5 parts of UVP-327 ultraviolet absorber,

[0065] 1 part of LS-144 light stabilizer,

[0066] BASF1010 antioxidant 0.5 parts,

[0067] And 1 part of polar solvent butyl ester.

[0068] The hydroxy acrylic dispersion in component A of this embodiment is a solvent-based resin, and its components include solvent-based acrylic resin I, solvent-based acrylic resin II and solvent-based acrylic resin III, and the mass ratio of solvent-based acrylic resin I, solvent-based acrylic resin II and solvent-based acrylic resin III is 8:7:7; solvent-based acrylic resin I is allnex resin SM515 / 70, solvent-based acrylic resin II is allnex resin SM516 / 70, and solvent-based acrylic resin III is Dongfu resin HF-SI.

[0069] In this embodiment, the pigment includes visible light reflecting particles, near-infrared reflecting particles and atmospheric window band emitting particles, wherein the weight portion of the visible light reflecting particles of barium sulfate particles is 6 parts, the weight portion of the visible light reflecting particles of titanium dioxide particles is 28 parts, the weight portion of the near-infrared reflecting particles of nano calcium carbonate particles is 4 parts, and the weight portion of the atmospheric window band emitting particles of silica particles is 2 parts.

[0070] In this embodiment, the particle size distribution of the visible light reflecting particles of barium sulfate particles and titanium dioxide particles is in the range of 0.1 to 1 μm, the particle size distribution of the near-infrared reflecting particles of nano calcium carbonate is in the range of 1 to 10 μm, and the particle size distribution of the atmospheric window band emission particles is in the range of 2 to 20 μm.

[0071] The additives used in this embodiment include dispersant BYK-104PS, leveling agent BYK333, defoamer DC-8590, preservative LF-B20 and anti-settling agent CP-88, wherein the weight portion of the dispersant is 0.6 parts, the weight portion of the defoamer is 0.8 parts, the weight portion of the leveling agent is 0.6 parts, the weight portion of the preservative is 0.2 parts, and the weight portion of the anti-settling agent is 0.2 parts.

[0072] In this embodiment, component B includes an isocyanate curing agent and a second solvent, wherein the second solvent is xylene and butyl ester, the mass ratio of the isocyanate curing agent, xylene and butyl ester is 10:1:1, and the isocyanate curing agent used in this embodiment is Covestro N3300 curing agent.

[0073] The preparation method of the acrylic polyurethane coating in this embodiment comprises the following steps:

[0074] Step 1: Prepare base paint:

[0075] Pour the hydroxy acrylic dispersion into a reactor, then pour in the dispersant, defoamer and leveling agent in sequence, mix and stir at a speed of 200 r / min for 5 minutes, slowly pour xylene into the mixed system obtained in the reactor, mix and stir at a speed of 300 r / min for 5 minutes, then add barium sulfate particles, titanium dioxide particles, nano calcium carbonate particles and silicon dioxide particles, continue to stir at a speed of 300 r / min for 10 minutes, then add the preservative and anti-settling agent under stirring, stir evenly to obtain the base paint;

[0076] Step 2: Prepare auxiliary agents:

[0077] Using a second reaction kettle, add the ultraviolet absorber, the light stabilizer, the antioxidant and the butyl ester in sequence and mix and stir evenly at a speed of 300 r / min to obtain an auxiliary agent;

[0078] Step 3: Prepare component A:

[0079] The base paint obtained in step 1 and the auxiliary agent obtained in step 2 were mixed and stirred at a speed of 350 r / min for 20 min to obtain component A, and the mixture was sealed and stored;

[0080] Step 4: Prepare component B:

[0081] Mix isocyanate curing agent, xylene and butyl ester in a mass ratio of 10:1:1, stir at a speed of 250 r / min for 5 minutes to obtain component B, and seal and store;

[0082] Step 5: Prepare acrylic polyurethane coating:

[0083] When in use, the component A obtained in step 3 and the component B obtained in step 4 are evenly mixed to obtain the acrylic polyurethane coating.

[0084] The acrylic polyurethane coating prepared by the present invention is coated on the surface of plastic, wood, marble and aluminum sheet by spraying, and cured at room temperature. The coating surface is dry for 2 hours, and is completely dry for 24 hours. The coating thickness is 200 μm.

[0085] Figure 1 These are photos of coatings obtained by applying the acrylic polyurethane coating prepared in Example 1 on different construction surfaces. The pictures show that the acrylic polyurethane coating prepared in Example 1 has a uniform texture, has good adhesion when applied on different types of substrates, and obtains good coating flatness.

[0086] Figure 2This is a UV-Vis-NIR spectral characteristic diagram of the radiative cooling acrylic polyurethane coating prepared in Example 1; as can be seen from the figure, the radiative cooling acrylic polyurethane coating has a solar spectrum band reflectivity of 97%, and an average emissivity of the infrared radiation band of the atmospheric window (8-13μm) is above 90%.

[0087] The coating prepared in Example 1 was applied to the surface of an aluminum sheet. After drying, the aluminum sheet was embedded in a polyethylene foam box of appropriate size. White colored steel tiles (Comparative Example 1), commercial white paint (Comparative Example 2), and ambient temperature (Comparative Example 3) were used as references.

[0088] Figure 3 This is a test diagram of the outdoor cooling effect of the radiant cooling acrylic polyurethane coating prepared in Example 1; as can be seen from the figure, the polyurethane radiant cooling coating prepared in this example has good cooling performance. The temperature of the radiant cooling coating in the sun is always lower than the ambient temperature.

[0089] During the test, the maximum surface temperature of white color steel tiles and commercial white paint can reach 43.3℃ and 38.9℃, the maximum ambient temperature is 30.7℃, and the maximum surface temperature of the radiation cooling coating is 29.0℃. During the six consecutive days of testing, during the daytime period of 6:00-18:00, the average temperature difference between white color steel tiles and radiation cooling coatings is 6.93℃, the average temperature difference between commercial white paint and radiation cooling coatings is 4.10℃, and the average temperature difference between ambient temperature and radiation cooling coatings is 3.54℃. During the daytime period of 6:00-18:00, the daytime temperature of the radiation cooling coating is 15.06℃ lower than the maximum temperature of white color steel tiles, 9.17℃ lower than the maximum daytime temperature of commercial white paint, and 6.12℃ lower than the average daytime ambient temperature.

[0090] Figure 4 This is a comparison chart of the anti-fouling performance test of the acrylic polyurethane radiant cooling coating prepared in Example 1; in the figure, the coating surface is smooth and the surface energy is low, which is conducive to reducing the accumulation of dirt; as can be seen from the figure, the carbon nano suspension is dropped on the coating surface to simulate the dust deposition process. After the suspension slides down, the dust can be removed by gently wiping the surface, demonstrating the anti-fouling performance of the acrylic polyurethane radiant cooling coating.

[0091] The acrylic polyurethane radiant refrigeration coating prepared in Example 1 was immersed in an acidic solution (pH=1, c=0.05 mol / L), an alkaline solution (pH=12, c=0.01 mol / L) and a salt solution (pH=7, saturation concentration: 26.5%) for 30 days.

[0092] Figure 5This is a graph showing the acid, alkali and salt resistance test results of the acrylic polyurethane radiation cooling coating prepared in Example 1; the coating in the figure shows no signs of falling off, blistering or discoloration, demonstrating its superior resistance to acidic, alkaline and saline environments, and demonstrating the chemical resistance of the radiation cooling coating.

[0093] The acrylic polyurethane radiant cooling coating prepared in Example 1 was brushed on concrete stones, tinplate and aluminum plates. After drying for 24 hours, the spindles were fixed on the surfaces of different coatings using AB glue. The pull-out test was performed after the glue was completely cured for 24 hours.

[0094] Figure 6 This is a real picture of the pull-out test of the acrylic polyurethane radiant cooling coating prepared in Example 1 on a concrete stone; the picture shows the pull-out effect of the radiant cooling coating on the concrete stone, and the data from the puller show that the pulling force required to remove the spindle from the concrete stone is 10.5 MPa. Figure 7 and Figure 8 These are actual pictures of the pull-out test of the acrylic polyurethane radiant cooling coating prepared in Example 1 on tinplate and aluminum plate; the pull-out data show that the pulling forces required to remove the ingot from the tinplate and aluminum sheet are 1.741 MPa and 1.557 MPa, respectively.

[0095] The acrylic polyurethane radiant cooling paint prepared in Example 1 was brush-coated on an aluminum plate, and a brushing test was performed using a Jingkelian paint brushing machine.

[0096] Fig. 9 This is a physical picture of the wash resistance test of the acrylic polyurethane radiant refrigeration coating prepared in Example 1; the weight of the coating and the substrate was recorded as 28.70g before the test, and the weight of the coating and the substrate was measured after washing for the 2000th, 5000th and 7000th times, which was still 28.70g, demonstrating the wash resistance test of the coating. After 8000 washes, the weight of the coating remained unchanged and there were no scratches on the surface.

[0097] Example 2

[0098] This embodiment provides a super weather-resistant acrylic polyurethane coating and a preparation method thereof.

[0099] The acrylic polyurethane coating provided in this embodiment includes component A and component B, and the mass ratio of component A to component B is 100:10.

[0100] In this embodiment, component A includes a base paint and an auxiliary agent, wherein the base paint includes the following raw materials in parts by weight:

[0101] 35 parts of hydroxy acrylic dispersion,

[0102] 20 parts of pigment,

[0103] 5 parts of the first solvent xylene,

[0104] and 2.0 parts of auxiliary agent;

[0105] The auxiliary agent includes the following raw materials in parts by weight:

[0106] 1.5 parts of UVP-327 ultraviolet absorber,

[0107] LS-144 light stabilizer 1 part,

[0108] BASF1010 antioxidant 0.5 parts,

[0109] And 1 part of polar solvent butyl ester.

[0110] The hydroxy acrylic dispersion in component A of this embodiment is a solvent-based resin, and its components include solvent-based acrylic resin I, solvent-based acrylic resin II and solvent-based acrylic resin III, and the mass ratio of solvent-based acrylic resin I, solvent-based acrylic resin II and solvent-based acrylic resin III is 9:6:7; solvent-based acrylic resin I is allnex resin SM515 / 70, solvent-based acrylic resin II is allnex resin SM516 / 70, and solvent-based acrylic resin III is Dongfu resin HF-SI.

[0111] In this embodiment, the pigment includes visible light reflecting particles, near-infrared reflecting particles and atmospheric window band emitting particles, wherein the weight portion of the visible light reflecting particles of barium sulfate particles is 3 parts, the weight portion of the visible light reflecting particles of titanium dioxide particles is 14 parts, the weight portion of the near-infrared reflecting particles of nano calcium carbonate particles is 2 parts, and the weight portion of the atmospheric window band emitting particles of silica particles is 1 part.

[0112] In this embodiment, the particle size distribution of the visible light reflecting particles of barium sulfate particles and titanium dioxide particles is in the range of 0.1 to 1 μm, the particle size distribution of the near-infrared reflecting particles of nano calcium carbonate is in the range of 1 to 10 μm, and the particle size distribution of the atmospheric window band emission particles is in the range of 2 to 20 μm.

[0113] The additives used in this embodiment include dispersant triethylhexyl phosphoric acid, leveling agent polydimethylsiloxane, defoamer DC-8590 methylphenyl silicone oil, preservative LF-B20 and anti-settling agent CP-88, wherein the weight portion of the dispersant is 0.5 part, the weight portion of the defoamer is 0.6 part, the weight portion of the leveling agent is 0.5 part, the weight portion of the preservative is 0.2 part, and the weight portion of the anti-settling agent is 0.2 part.

[0114] In this embodiment, component B includes an isocyanate curing agent and a second solvent, wherein the second solvent is xylene and butyl ester, and the mass ratio of the isocyanate curing agent, xylene and butyl ester is 8:2:1. The isocyanate curing agent used in this embodiment is Covestro N3300 curing agent.

[0115] The preparation method of the acrylic polyurethane coating in this embodiment comprises the following steps:

[0116] Step 1: Prepare base paint:

[0117] Pour the hydroxy acrylic dispersion into a reactor, then pour in the dispersant, defoamer and leveling agent in sequence, mix and stir at a speed of 200 r / min for 5 minutes, slowly pour xylene into the mixed system obtained in the reactor, mix and stir at a speed of 300 r / min for 5 minutes, then add barium sulfate particles, titanium dioxide particles, nano calcium carbonate particles and silicon dioxide particles, continue to stir at a speed of 300 r / min for 10 minutes, then add the preservative and anti-settling agent under stirring, stir evenly to obtain the base paint;

[0118] Step 2: Prepare auxiliary agents:

[0119] Using a second reaction kettle, add the ultraviolet absorber, the light stabilizer, the antioxidant and the butyl ester in sequence and mix and stir evenly at a speed of 300 r / min to obtain an auxiliary agent;

[0120] Step 3: Prepare component A:

[0121] The base paint obtained in step 1 and the auxiliary agent obtained in step 2 were mixed and stirred at a speed of 350 r / min for 20 min to obtain component A, and the mixture was sealed and stored;

[0122] Step 4: Prepare component B:

[0123] Mix isocyanate curing agent, xylene and butyl ester in a mass ratio of 8:2:1, stir at a speed of 250 r / min for 5 minutes to obtain component B, and seal and store;

[0124] Step 5: Prepare acrylic polyurethane coating:

[0125] When in use, the component A obtained in step 3 and the component B obtained in step 4 are evenly mixed to obtain the acrylic polyurethane coating.

[0126] Example 3

[0127] This embodiment provides a super weather-resistant acrylic polyurethane coating and a preparation method thereof.

[0128] The acrylic polyurethane coating provided in this embodiment includes component A and component B, and the mass ratio of component A to component B is 100:30.

[0129] In this embodiment, component A includes a base paint and an auxiliary agent, wherein the base paint includes the following raw materials in parts by weight:

[0130] 45 parts of hydroxy acrylic dispersion,

[0131] 30 parts of pigment,

[0132] 5 parts of the first solvent xylene,

[0133] and 3.0 parts of auxiliary agent;

[0134] The auxiliary agent includes the following raw materials in parts by weight:

[0135] 1.5 parts of UVP-327 ultraviolet absorber,

[0136] LS-144 light stabilizer 1 part,

[0137] BASF1010 antioxidant 0.5 parts,

[0138] And 1 part of polar solvent butyl ester.

[0139] The hydroxy acrylic dispersion in component A of this embodiment is a solvent-based resin, and its components include solvent-based acrylic resin I, solvent-based acrylic resin II and solvent-based acrylic resin III, and the mass ratio of solvent-based acrylic resin I, solvent-based acrylic resin II and solvent-based acrylic resin III is 10:4:2; solvent-based acrylic resin I is allnex resin SM515 / 70, solvent-based acrylic resin II is allnex resin SM516 / 70, and solvent-based acrylic resin III is Dongfu resin HF-SI.

[0140] In this embodiment, the pigment includes visible light reflecting particles, near-infrared reflecting particles and atmospheric window band emitting particles, wherein the weight portion of barium sulfate particles of the visible light reflecting particles is 4.5 parts, the weight portion of titanium dioxide particles of the visible light reflecting particles is 21 parts, the weight portion of nano calcium carbonate particles of the near-infrared reflecting particles is 3 parts, and the weight portion of silica particles of the atmospheric window band emitting particles is 1.5 parts.

[0141] In this embodiment, the particle size distribution of the visible light reflecting particles of barium sulfate particles and titanium dioxide particles is in the range of 0.1 to 1 μm, the particle size distribution of the near-infrared reflecting particles of nano calcium carbonate is in the range of 1 to 10 μm, and the particle size distribution of the atmospheric window band emission particles is in the range of 2 to 20 μm.

[0142] The additives used in this embodiment include dispersant triethylhexyl phosphoric acid, leveling agent polydimethylsiloxane, defoamer DC-8590 methylphenyl silicone oil, preservative LF-B20 and anti-settling agent CP-88, wherein the weight portion of the dispersant is 0.8 part, the weight portion of the defoamer is 0.8 part, the weight portion of the leveling agent is 0.8 part, the weight portion of the preservative is 0.3 part, and the weight portion of the anti-settling agent is 0.3 part.

[0143] In this embodiment, component B includes an isocyanate curing agent and a second solvent, wherein the second solvent is xylene and butyl ester, and the mass ratio of the isocyanate curing agent, xylene and butyl ester is 7:3:5. The isocyanate curing agent used in this embodiment is Covestro N3300 curing agent.

[0144] The preparation method of the acrylic polyurethane coating in this embodiment comprises the following steps:

[0145] Step 1: Prepare base paint:

[0146] Pour the hydroxy acrylic acid dispersion into a reactor, then pour in the dispersant, defoamer and leveling agent in sequence, mix and stir at a speed of 250 r / min for 10 minutes, slowly pour xylene into the mixed system obtained in the reactor, mix and stir at a speed of 450 r / min for 10 minutes, then add barium sulfate particles, titanium dioxide particles, nano calcium carbonate particles and silicon dioxide particles, continue to stir at a speed of 450 r / min for 20 minutes, then add the preservative and anti-settling agent in the stirring state, stir evenly to obtain the base paint;

[0147] Step 2: Prepare auxiliary agents:

[0148] Using a second reaction kettle, add the ultraviolet absorber, the light stabilizer, the antioxidant and the butyl ester in sequence and mix and stir evenly at a speed of 350 r / min to obtain an auxiliary agent;

[0149] Step 3: Prepare component A:

[0150] The base paint obtained in step 1 and the auxiliary agent obtained in step 2 were mixed and stirred at a speed of 450 r / min for 30 minutes to obtain component A, and the mixture was sealed and stored;

[0151] Step 4: Prepare component B:

[0152] Mix isocyanate curing agent, xylene and butyl ester in a mass ratio of 7:3:5, stir at a speed of 350 r / min for 10 min to obtain component B, and seal and store;

[0153] Step 5: Prepare acrylic polyurethane coating:

[0154] When in use, the component A obtained in step 3 and the component B obtained in step 4 are evenly mixed to obtain the acrylic polyurethane coating.

[0155] Example 4

[0156] This embodiment provides a super weather-resistant acrylic polyurethane coating and a preparation method thereof.

[0157] The acrylic polyurethane coating provided in this embodiment includes component A and component B, and the mass ratio of component A to component B is 100:40.

[0158] In this embodiment, component A includes a base paint and an auxiliary agent, wherein the base paint includes the following raw materials in parts by weight:

[0159] 60 parts of hydroxy acrylic dispersion,

[0160] 50 parts of pigment,

[0161] 5 parts of the first solvent xylene,

[0162] and 3.8 parts of auxiliary agent;

[0163] The auxiliary agent includes the following raw materials in parts by weight:

[0164] 1.5 parts of UVP-327 ultraviolet absorber,

[0165] LS-144 light stabilizer 1 part,

[0166] BASF1010 antioxidant 0.5 parts,

[0167] And 1 part of polar solvent butyl ester.

[0168] The hydroxy acrylic dispersion in component A of this embodiment is a solvent-based resin, and its components include solvent-based acrylic resin I, solvent-based acrylic resin II and solvent-based acrylic resin III, and the mass ratio of solvent-based acrylic resin I, solvent-based acrylic resin II and solvent-based acrylic resin III is 12:5:5; solvent-based acrylic resin I is allnex resin SM515 / 70, solvent-based acrylic resin II is allnex resin SM516 / 70, and solvent-based acrylic resin III is dongfeng resin HF-SI.

[0169] In this embodiment, the pigment includes visible light reflecting particles, near-infrared reflecting particles and atmospheric window band emitting particles, wherein the weight portion of barium sulfate particles of the visible light reflecting particles is 7.5 parts, the weight portion of titanium dioxide particles of the visible light reflecting particles is 35 parts, the weight portion of nano calcium carbonate particles of the near-infrared reflecting particles is 5 parts, and the weight portion of silica particles of the atmospheric window band emitting particles is 2.5 parts.

[0170] In this embodiment, the particle size distribution of the visible light reflecting particles of barium sulfate particles and titanium dioxide particles is in the range of 0.1 to 1 μm, the particle size distribution of the near-infrared reflecting particles of nano calcium carbonate is in the range of 1 to 10 μm, and the particle size distribution of the atmospheric window band emission particles is in the range of 2 to 20 μm.

[0171] The additives used in this embodiment include dispersant triethylhexyl phosphoric acid, leveling agent polydimethylsiloxane, defoamer DC-8590 methylphenyl silicone oil, preservative LF-B20 and anti-settling agent CP-88, wherein the weight portion of the dispersant is 1.0 part, the weight portion of the defoamer is 1.0 part, the weight portion of the leveling agent is 1.0 part, the weight portion of the preservative is 0.4 part, and the weight portion of the anti-settling agent is 0.4 part.

[0172] In this embodiment, component B includes an isocyanate curing agent and a second solvent, wherein the second solvent is xylene and butyl ester, and the mass ratio of the isocyanate curing agent, xylene and butyl ester is 10:3:4. The isocyanate curing agent used in this embodiment is Covestro N3300 curing agent.

[0173] The preparation method of the acrylic polyurethane coating in this embodiment comprises the following steps:

[0174] Step 1: Prepare base paint:

[0175] Pour the hydroxy acrylic acid dispersion into a reactor, then pour in the dispersant, defoamer and leveling agent in sequence, mix and stir at a speed of 250 r / min for 10 minutes, slowly pour xylene into the mixed system obtained in the reactor, mix and stir at a speed of 450 r / min for 10 minutes, then add barium sulfate particles, titanium dioxide particles, nano calcium carbonate particles and silicon dioxide particles, continue to stir at a speed of 450 r / min for 20 minutes, then add the preservative and anti-settling agent in the stirring state, stir evenly to obtain the base paint;

[0176] Step 2: Prepare auxiliary agents:

[0177] Using a second reaction kettle, add the ultraviolet absorber, the light stabilizer, the antioxidant and the butyl ester in sequence and mix and stir evenly at a speed of 350 r / min to obtain an auxiliary agent;

[0178] Step 3: Prepare component A:

[0179] The base paint obtained in step 1 and the auxiliary agent obtained in step 2 were mixed and stirred at a speed of 450 r / min for 30 minutes to obtain component A, and the mixture was sealed and stored;

[0180] Step 4: Prepare component B:

[0181] Mix isocyanate curing agent, xylene and butyl ester in a mass ratio of 10:3:4, stir at a speed of 350 r / min for 10 min to obtain component B, and seal and store;

[0182] Step 5: Prepare acrylic polyurethane coating:

[0183] When in use, the component A obtained in step 3 and the component B obtained in step 4 are evenly mixed to obtain the acrylic polyurethane coating.

Claims

1. A super weather-resistant acrylic polyurethane coating, characterized in that: It comprises component A and component B, wherein the mass ratio of component A to component B is 100:10-40; The A component includes a base paint and an auxiliary agent. The base paint comprises the following raw materials in parts by weight: 30-60 parts of hydroxy acrylic dispersion, Pigment 20-50 parts, 5 to 20 parts of the first solvent, and 2 to 10 parts of auxiliary agent; The auxiliary agent includes the following raw materials in parts by weight: 1 to 3 parts of ultraviolet absorber, Light stabilizer 0.5-2 parts, 0.5-1 part antioxidant and 0.5 to 1 part of polar solvent; The B component includes an isocyanate curing agent and a second solvent.

2. The super weather-resistant acrylic polyurethane coating according to claim 1, characterized in that: The hydroxy acrylic dispersion is a solvent-based resin, and its components include solvent-based acrylic resin I, solvent-based acrylic resin II and solvent-based acrylic resin III, the mass ratio of the solvent-based acrylic resin I, solvent-based acrylic resin II and solvent-based acrylic resin III is 5-15:2-5:2-5; the solvent-based acrylic resin I is allnex resin SM515 / 70, the solvent-based acrylic resin II is allnex resin SM516 / 70, and the solvent-based acrylic resin III is one or a combination of two of Dongfu resin HF-SI or Covestro resin BayhydrolA2542.

3. A super weather-resistant acrylic polyurethane coating according to claim 1 or 2, characterized in that: The pigment includes sunlight reflecting particles and atmospheric window band emitting particles, and the mass ratio of the sunlight reflecting particles to the atmospheric window band emitting particles is 3 to 8:1; the sunlight reflecting particles include visible light reflecting particles and near infrared reflecting particles, and the mass ratio of the visible light reflecting particles to the near infrared reflecting particles is 5 to 8:1; The visible light reflecting particles are barium sulfate particles and / or titanium dioxide particles with a particle size distribution in the range of 0.1 to 1 μm, the near-infrared reflecting particles are calcium carbonate particles with a particle size distribution in the range of 1 to 10 μm, and the atmospheric window band emitting particles are one or a combination of silicon dioxide particles, silicon nitride particles or silicon carbide particles with a particle size distribution in the range of 2 to 20 μm.

4. The super weather-resistant acrylic polyurethane coating according to claim 3, characterized in that: The first solvent is one or a combination of xylene, toluene, butyl acetate, ethylene glycol monomethyl ether or trichloroethylene; the auxiliary agent includes a dispersant, a leveling agent, a defoamer, a preservative and an anti-settling agent, and the mass ratio of the dispersant, the leveling agent, the defoamer, the preservative and the anti-settling agent is 0.5-1.0:0.5-1.0:0.5-1.0:0.2-0.4:0.2-0.4; the dispersant is an unsaturated polycarboxylic acid polymer, triethylhexyl phosphoric acid, sodium lauryl sulfate, methyl amyl alcohol, polyacrylamide, The leveling agent is one or more of polydimethylsiloxane, acrylic acid or fluorophosphate; the defoaming agent is one or more of methylphenyl silicone oil, polydimethylsiloxane, alkylnaphthalene or polyacrylate; the preservative is one or more of LF-B20 preservative, isothiazolone derivative or n-octylisothiazolinone; the anti-settling agent is one or more of CP-88 anti-settling agent, polyamide, polyurea compound or polyether.

5. A super weather-resistant acrylic polyurethane coating according to claim 4, characterized in that: The ultraviolet absorber is one or a combination of UVP-327 or UV-531 ultraviolet absorbers; the light stabilizer is a hindered amine light stabilizer, specifically one or a combination of LS-144, LS-292 or LS-123 light stabilizers; the antioxidant is one or a combination of BASF1010 or BASF168 antioxidants; the polar solvent is one or a combination of dimethylformamide, methanol, methyl isobutyl ketone, acetone or butyl ester.

6. The super weather-resistant acrylic polyurethane coating according to claim 5, characterized in that: The isocyanate curing agent in component B is one or a combination of Covestro N3300 curing agent, Wanhua PM200 curing agent or Tosoh HXR-100 curing agent; the second solvent is one or a combination of xylene, butyl ester, toluene, butyl acetate, ethylene glycol monomethyl ether or trichloroethylene; the mass ratio of the isocyanate curing agent to the second solvent is 5-10:2-10.

7. A method for preparing the super weather-resistant acrylic polyurethane coating according to any one of claims 1 to 6, characterized in that: The steps include: Step 1: Prepare base paint: The hydroxy acrylic dispersion is mixed and stirred evenly with a dispersant, a defoamer, and a leveling agent at a first speed, the first solvent is added to the obtained mixed system, the mixture is mixed and stirred evenly at a second speed, and then visible light reflecting particles, near infrared reflecting particles, and atmospheric window band emitting particles are added, the mixing and stirring at the second speed is continued, and a preservative and an anti-settling agent are added during the stirring process, and the mixture is stirred evenly to obtain a base paint; Step 2: Prepare auxiliary agents: The ultraviolet absorber, the light stabilizer, the antioxidant and the polar solvent are mixed and stirred uniformly at a third speed to obtain an auxiliary agent; Step 3: Prepare component A: The base paint obtained in step 1 and the auxiliary agent obtained in step 2 are mixed and stirred at a fourth speed to obtain component A, and the component A is sealed and stored; Step 4: Prepare component B: Mixing the isocyanate curing agent and the second solvent at a fifth speed to obtain component B, and sealing and storing the component; Step 5: Prepare acrylic polyurethane coating: When in use, the component A obtained in step three and the component B obtained in step four are evenly mixed to obtain the acrylic polyurethane coating.

8. The method for preparing a super weather-resistant acrylic polyurethane coating according to claim 7, characterized in that: The first speed is 200-250 r / min, the second speed is 300-450 r / min, the third speed is 300-350 r / min, the fourth speed is 350-450 r / min, and the fifth speed is 250-350 r / min.

9. A super weather-resistant acrylic polyurethane radiation cooling coating, characterized in that: The super weather-resistant acrylic polyurethane coating according to any one of claims 1 to 6 is applied to the working surface by spraying, flow coating or brushing, and then cured at room temperature. The super weather-resistant acrylic polyurethane radiation cooling coating has a thickness of 100 to 300 μm.

10. An application of the super weather-resistant acrylic polyurethane radiation cooling coating as claimed in claim 9 in building cooling, industrial equipment cooling, outdoor equipment cooling or cold chain transportation.

Images