A double-component separated hot water paint and its preparation method and application

Abstract

The present invention provides a two-component separated hot water paint and its preparation method and application, belonging to the technical field of paint. The two-component separated hot water paint provided by the present invention comprises a main agent and a composite curing agent which are packaged separately; in terms of mass fractions, the main agent comprises the following components: 50 to 65 parts of resin; 10 to 21 parts of pigment; 10 to 20 parts of filler; 0.1 to 0.2 parts of bentonite; 0.1 to 1.0 parts of defoamer; 0.1 to 1.0 parts of wetting agent; 0.1 to 1.0 parts of thickener; 1 to 2 parts of cosolvent; 10 to 20 parts of water; the pigment is titanium dioxide and strontium titanate nanoparticles, and the mass of the strontium titanate nanoparticles does not exceed 0.9% of the total mass of the main agent. The two-component separated hot water paint provided by the present invention has excellent thermal insulation performance.

Description

Technical Field

[0001] The invention relates to the technical field of coatings, and in particular to a two-component separated hot water-based coating and a preparation method and application thereof. Background Art

[0002] The solar energy radiating to the earth's surface is about 750w / m 2 Due to the continuous exposure to sunlight, heat will accumulate on the surface of the irradiated object, causing the surface temperature of the object to continue to rise. When an object absorbs solar radiation, the surface temperature is too high, which will bring many problems and inconveniences to industrial production and daily life. In addition, the high surface temperature of an object caused by solar radiation can also make it difficult for materials directly irradiated by sunlight to maintain good mechanical and chemical properties, such as accelerating the corrosion, aging and degradation of the material, and accelerating the cracking, loss of light and fading of the material. Therefore, finding various methods to reduce or prevent the temperature rise caused by strong solar radiation is an important research topic.

[0003] There are already many infrared heat reflective coatings (passive cooling coatings) on the market that mainly reflect near-infrared rays in sunlight, but most of these coatings are solvent-based products and do not meet environmental protection requirements. Water-based coatings are easy to apply, meet environmental protection requirements, are non-flammable, and have performance similar to solvent-based products. They have gradually become one of the coating varieties that people are vigorously developing. At present, there are two main research paths for infrared heat reflective coatings: one is to improve the resin to give the coating good anti-fouling and adhesion properties, but a large number of experiments have proved that different resins have little effect on the reflectivity of the coating; the other is to improve the pigment to obtain materials with higher reflectivity and reflectivity. The larger the refractive index, the stronger the material's reflective ability in the visible light region and near-infrared region.

[0004] Currently, the most common pigment in water-based paints is titanium dioxide. Although it has a high refractive index, the thermal insulation performance of water-based paints prepared only with titanium dioxide as a pigment still needs to be improved. Summary of the invention

[0005] The purpose of the present invention is to provide a two-component separated hot water paint and a preparation method and application thereof. The two-component separated hot water paint provided by the present invention has excellent thermal insulation performance.

[0006] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions:

[0007] The present invention provides a two-component separated hot water paint, comprising a separately packaged main agent and a composite curing agent;

[0008] The main agent includes the following components in parts by mass:

[0009] Resin 50-65 parts; Pigment 10-21 parts; Filler 10-20 parts; Bentonite 0.1-0.2 parts; Defoamer 0.1-1.0 parts; Wetting agent 0.1-1.0 parts; Thickener 0.1-1.0 parts; Cosolvent 1-2 parts; Water 10-20 parts;

[0010] The pigment is titanium dioxide and strontium titanate nanoparticles, and the mass of the strontium titanate nanoparticles does not exceed 0.9% of the total mass of the main agent.

[0011] Preferably, the strontium titanate nanoparticles include one or more of octahedral strontium titanate, hexahedral strontium titanate and irregular strontium titanate; and the particle size of the strontium titanate nanoparticles is 50 to 300 nm.

[0012] Preferably, the titanium dioxide includes rutile titanium dioxide and / or anatase titanium dioxide.

[0013] Preferably, the resin is a water-based epoxy resin, and the water-based epoxy resin includes one or more of water-based epoxy resin Beckopox EP37, water-based epoxy resin STW602 and water-based epoxy resin EP7520.

[0014] Preferably, the filler comprises sericite powder;

[0015] The defoamer comprises at least two of the defoamer NOPCONXZ, the defoamer FoamasterMO 2157 and the defoamer BYK-011;

[0016] The wetting agents include wetting agent TEGO TWIN 4100, wetting agent BYK-220SN, wetting agent One or more of VXW6208 and wetting agent WE3229;

[0017] The thickener includes one or more of thickener BorchiGel0620, thickener BYK-420 and thickener VXW6388;

[0018] The co-solvent includes co-solvent DPMS2310 and / or co-solvent S312.

[0019] Preferably, the composite curing agent comprises a curing agent, a film-forming aid and water, and the mass ratio of the curing agent, the film-forming aid and the water in the composite curing agent is 50-75:30-35:20-25.

[0020] Preferably, the curing agent comprises curing agent Beckopox VEHEH64 and / or curing agent Beckopox VEHEH29;

[0021] The film-forming aid includes film-forming aid PMS310 and / or film-forming aid S240.

[0022] Preferably, the mass ratio of the main agent to the composite curing agent is 3 to 6:1.

[0023] The present invention provides a method for preparing the two-component separated hot water-based paint according to the above technical solution, wherein the method for preparing the main agent comprises the following steps:

[0024] Mixing bentonite, pigment, defoamer and part of water, and performing pre-mixing and grinding in sequence to obtain grinding slurry;

[0025] The grinding slurry, resin, filler, cosolvent, wetting agent, thickener and remaining water are mixed and blended to obtain the main agent.

[0026] The present invention provides the use of the two-component separated hot water-based paint described in the above technical solution or the two-component separated hot water-based paint prepared by the preparation method described in the above technical solution in a thermal insulation coating.

[0027] The invention provides a two-component separated hot water paint, comprising a main agent and a composite curing agent which are packaged separately; the main agent comprises the following components in parts by mass: 50-65 parts of resin; 10-21 parts of pigment; 10-20 parts of filler; 0.1-0.2 parts of bentonite; 0.1-1.0 parts of defoamer; 0.1-1.0 parts of wetting agent; 0.1-1.0 parts of thickener; 1-2 parts of cosolvent; 10-20 parts of water; the pigment is titanium dioxide and strontium titanate nanoparticles, and the mass of the strontium titanate nanoparticles does not exceed 0.9% of the total mass of the main agent. The present invention adopts titanium dioxide and strontium titanate nanoparticles as pigments. Strontium titanate is a metal oxide with excellent chemical stability, high refractive index (refractive index is 2.409) and high bandgap width (3.2eV), which makes the strontium titanate nanoparticles have good reflection ability for light in the visible light region and near infrared region, and it is difficult to be broken down and has high radiation resistance. The double-component separated hot water paint prepared by the present invention based on titanium dioxide and strontium titanate nanoparticles has excellent heat insulation performance. The results of the embodiment show that when the two-component hot water coating of the present invention is sprayed on the tinplate, the temperature of the tinplate rises to a minimum of 7°C under the test condition of irradiation with a 250W incandescent lamp for 60 minutes, while when the two-component hot water coating without strontium titanate nanoparticles is sprayed on the tinplate, the temperature of the tinplate rises by 10°C under the same test conditions. The thermal insulation performance is evaluated by the temperature change of the tinplate plate. The thermal insulation performance of the water-based thermal insulation coating prepared by the present invention is significantly improved by 30%, and the addition of strontium titanate nanoparticles does not affect other properties of the two-component hot water coating (such as gloss, appearance, etc.).

[0028] The invention provides a method for preparing the double-component separated hot water-based paint. The preparation method provided by the invention is simple and easy to implement and is suitable for large-scale production. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is the SEM image of irregular strontium titanate;

[0030] Figure 2 is the SEM image of octahedral strontium titanate;

[0031] Figure 3 is the SEM image of hexahedral strontium titanate;

[0032] Figure 4 This is a test diagram of the thermal insulation performance of the coating in Example 1;

[0033] Figure 5 This is a test diagram of the thermal insulation performance of the coating in Example 7;

[0034] Figure 6 This is a test diagram of the thermal insulation performance of the coating in Comparative Example 1. DETAILED DESCRIPTION

[0035] The present invention provides a two-component separated hot water paint, comprising a separately packaged main agent and a composite curing agent;

[0036] The main agent includes the following components in parts by mass:

[0037] Resin 50-65 parts; Pigment 10-21 parts; Filler 10-20 parts; Bentonite 0.1-0.2 parts; Defoamer 0.1-1.0 parts; Wetting agent 0.1-1.0 parts; Thickener 0.1-1.0 parts; Cosolvent 1-2 parts; Water 10-20 parts;

[0038] The pigment is titanium dioxide and strontium titanate nanoparticles, and the mass of the strontium titanate nanoparticles does not exceed 0.9% of the total mass of the main agent.

[0039] In the present invention, unless otherwise specified, the raw materials used are commercially available products well known to those skilled in the art or are prepared by methods well known to those skilled in the art.

[0040] The two-component separated hot water paint provided by the present invention includes a main agent, which includes 50 to 65 parts of resin by mass, specifically 50 parts, 55 parts, 60 parts or 65 parts. In the present invention, the resin is preferably a water-based epoxy resin, and the water-based epoxy resin preferably includes one or more of water-based epoxy resin Beckopox EP37, water-based epoxy resin STW602 and water-based epoxy resin EP7520, more preferably water-based epoxy resin Beckopox EP37, water-based epoxy resin STW602 or water-based epoxy resin EP7520. The present invention preferably uses the above-mentioned types of resins, which have the characteristics of high mechanical properties, excellent bonding properties, small curing shrinkage, good heat resistance, etc.

[0041] Based on the mass fraction of the resin, the main agent of the present invention includes 10 to 21 parts of pigment, preferably 13 to 20.5 parts, more preferably 16 to 20.3 parts, and further preferably 18 to 20.12 parts. In the present invention, the pigment is titanium dioxide and strontium titanate nanoparticles, and the mass of the strontium titanate nanoparticles does not exceed 0.9% of the total mass of the main agent, preferably 0.1 to 0.8% of the total mass of the main agent, more preferably 0.2 to 0.7% of the total mass of the main agent, further preferably 0.3 to 0.6% of the total mass of the main agent, and further preferably 0.4 to 0.5% of the total mass of the main agent. In the present invention, the strontium titanate nanoparticles preferably include one or more of octahedral strontium titanate, hexahedral strontium titanate and irregular strontium titanate, and are more preferably octahedral strontium titanate, hexahedral strontium titanate or irregular strontium titanate; the particle size of the strontium titanate nanoparticles is preferably 50 to 300 nm, specifically, the particle size of the octahedral strontium titanate is preferably 50 to 170 nm, the particle size of the hexahedral strontium titanate is preferably 200 to 300 nm, and the particle size of the irregular strontium titanate is preferably 100 to 200 nm. In the present invention, the titanium dioxide preferably includes rutile titanium dioxide and / or anatase titanium dioxide, more preferably rutile titanium dioxide or anatase titanium dioxide; the rutile titanium dioxide is preferably rutile titanium dioxide R-996 and / or rutile titanium dioxide R-706, more preferably rutile titanium dioxide R-996 or rutile titanium dioxide R-706; the particle size of the titanium dioxide is preferably 30 to 100 nm. The present invention uses titanium dioxide and strontium titanate nanoparticles as pigments to increase the reflectivity of the coating to visible light and near-infrared light, which is beneficial to improving thermal insulation performance; the present invention controls the amount of strontium titanate nanoparticles within the above range, which is beneficial to improving thermal insulation performance while maintaining the appearance and gloss of the coating itself. If the amount added is too much, it will affect the light transmittance and gloss of the coating itself, and thus affect the actual application effect of the coating.

[0042] Based on the mass fraction of the resin, the main agent of the present invention includes 10 to 20 parts of filler, specifically 10 parts, 13 parts, 15 parts, 18 parts or 20 parts. In the present invention, the filler preferably includes sericite powder, and the particle size of the sericite powder is preferably 2 to 10 μm; the sericite powder is preferably one or more of sericite powder GA-1, sericite powder GA-2 and sericite powder GA-4, and more preferably sericite powder GA-1, sericite powder GA-2 or sericite powder GA-4. The present invention preferably uses sericite powder as a filler, which has a large reserve and wide distribution, and is conducive to improving the mechanical strength, toughness, adhesion, anti-aging performance and corrosion resistance of the coating.

[0043] Based on the mass fraction of the resin, the main agent of the present invention includes 0.1 to 0.2 parts of bentonite, specifically 0.1 parts, 0.15 parts or 0.2 parts. In the present invention, the bentonite is preferably bentonite EW; The bentonite has a thickening effect on the coating and can improve the suspension stability of the coating.

[0044] Based on the mass fraction of the resin, the main agent of the present invention includes 0.1 to 1.0 parts of defoamer, specifically 0.1 parts, 0.3 parts, 0.5 parts, 0.8 parts or 1.0 parts. In the present invention, the defoamer preferably includes at least two of defoamer NOPCONXZ, defoamer Foamaster MO 2157 and defoamer BYK-011, specifically defoamer NOPCONXZ, defoamer Foamaster MO 2157 and defoamer BYK-011 can be used together, defoamer Foamaster MO 2157 and defoamer BYK-011 can also be used together, and defoamer NOPCONXZ and defoamer Foamaster MO 2157 can also be used together. The present invention preferably uses the above-mentioned types of defoamers, which can significantly eliminate the foaming problem of the coating during the preparation process on the basis of using a small amount, and prevent the paint film from having fisheyes and shrinkage problems.

[0045] Based on the mass fraction of the resin, the main agent of the present invention includes 0.1 to 1.0 parts of a wetting agent, specifically 0.1 parts, 0.3 parts, 0.5 parts, 0.8 parts or 1.0 parts. In the present invention, the wetting agent preferably includes a wetting agent TEGOTWIN 4100, a wetting agent BYK-220SN, a wetting agent One or more of VXW6208 and wetting agent WE3229, more preferably wetting agent TEGO TWIN 4100, wetting agent BYK-220SN, wetting agent VXW6208 or wetting agent WE3229. The present invention preferably uses the above-mentioned wetting agent, which can significantly improve the wetting and spreading of the coating on the substrate with a small amount, enhance the smoothness of the coating film surface, and prevent the undesirable phenomena such as shrinkage cavities and edge shrinkage caused by low surface tension of the substrate, thereby improving the adhesion of the coating film.

[0046] Based on the mass fraction of the resin, the main agent of the present invention includes 0.1 to 1.0 parts of thickener, specifically 0.1 parts, 0.3 parts, 0.5 parts, 0.8 parts or 1.0 parts. In the present invention, the thickener preferably includes one or more of thickener BorchiGel0620, thickener BYK-420 and thickener VXW6388, more preferably thickener BorchiGel0620, thickener BYK-420 or thickener VXW6388. The present invention preferably uses the above-mentioned types of thickeners, and a small amount of use can improve the viscosity, adhesion and hiding power of the coating.

[0047] Based on the mass fraction of the resin, the main agent of the present invention includes 1 to 2 parts of a cosolvent, specifically 1 part, 1.3 parts, 1.5 parts, 1.8 parts or 2 parts. In the present invention, the cosolvent preferably includes cosolvent DPMS2310 and / or cosolvent S312, more preferably cosolvent DPMS2310 or cosolvent S312. The present invention preferably uses the above-mentioned types of cosolvents, which can promote rapid film formation of the coating and reduce the freezing temperature of the coating.

[0048] Based on the mass fraction of the resin, the main agent of the present invention includes 10 to 20 parts of water, specifically 10 parts, 13 parts, 15 parts, 17 parts or 20 parts. The water of the present invention is preferably deionized water.

[0049] In the present invention, the viscosity of the main agent is preferably 1760 to 2700 cP, more preferably 1760 to 2300 cP, further preferably 1760 to 2000 cP, and further preferably 1760 to 1860 cP.

[0050] The two-component separated hot water paint provided by the present invention includes a composite curing agent, the composite curing agent includes a curing agent, a film-forming aid and water, and the mass ratio of the curing agent, the film-forming aid and the water in the composite curing agent is preferably 50-75:30-35:20-35, and more preferably 50-55:30-32:20-25. In the present invention, the curing agent includes preferably curing agent Beckopox VEHEH64 and / or curing agent Beckopox VEHEH29, and more preferably curing agent Beckopox VEHEH64 and curing agent Beckopox VEHEH29; when the curing agent is curing agent Beckopox VEHEH64 and curing agent Beckopox VEHEH29, the mass ratio of curing agent Beckopox VEHEH64 and curing agent Beckopox VEHEH29 is preferably 15-17:33-35, and more preferably 16:34. In the present invention, the film-forming aid preferably includes a film-forming aid PMS310 and / or a film-forming aid S240 (BCS), more preferably a film-forming aid PMS310 and a film-forming aid S240; when the film-forming aid is a film-forming aid PMS310 and a film-forming aid S240, the mass ratio of the film-forming aid PMS310 to the film-forming aid S240 is preferably 20-25:5-10, more preferably 23-25:5-7. In the present invention, the water is preferably deionized water.

[0051] The mass ratio of the main agent to the composite curing agent in the two-component separated hot water-based paint provided by the present invention is preferably 3 to 6:1, more preferably 5:1.

[0052] The present invention provides a method for preparing the two-component separated hot water-based paint according to the above technical solution, wherein the method for preparing the main agent comprises the following steps:

[0053] Mixing bentonite, pigment, defoamer and part of water, and performing pre-mixing and grinding in sequence to obtain grinding slurry;

[0054] The grinding slurry, resin, filler, cosolvent, wetting agent, thickener and remaining water are mixed and blended to obtain the main agent.

[0055] The present invention mixes bentonite, pigment, defoamer and part of water for pre-mixing to obtain pre-mixed slurry. In the present invention, the part of water preferably accounts for 30-50% of the total mass of water in the main agent, and more preferably 40-50%. In the present invention, the pre-mixing preferably includes: mixing the bentonite with part of the water, stirring for 15-20 minutes under a stirring frequency of 10-15Hz, so that the obtained mixed material is in a uniform paste (using a paint knife to stir the mixed material to observe that there are no opaque particles), and then adding part of the titanium dioxide, all the defoamer and the remaining titanium dioxide to the mixed material in sequence under a stirring frequency of 15-18Hz, stirring for 3-5 minutes after each component is added, and then adding the next component, and finally adding strontium titanate nanoparticles, stirring for 15-20 minutes after the addition is completed, to obtain the pre-mixed slurry. The titanium dioxide in the present invention is preferably added in two times, which is conducive to better dispersion in the pre-mixed slurry.

[0056] After obtaining the pre-refined pulp, the present invention grinds the pre-refined pulp to obtain a grinding pulp. In the present invention, the grinding speed is preferably 3000-4500 rpm, more preferably 3000-3500 rpm; the time is preferably 60-90 min, more preferably 80-90 min; the grinding is preferably based on ensuring that the fineness of the grinding pulp is less than 30 μm; during the grinding process, the grinding temperature is preferably controlled to be less than 50° C., and the grinding pressure is preferably controlled to be less than 0.2 MPa.

[0057] After obtaining the grinding slurry, the present invention mixes the grinding slurry, resin, filler, cosolvent, wetting agent, thickener and remaining water for blending treatment to obtain the main agent. In the present invention, the blending treatment preferably includes: adding resin to the grinding slurry, stirring for 2 to 5 minutes at a stirring frequency of 15 to 18 Hz, then adding filler and adjusting the stirring frequency to 18 to 29 Hz, maintaining the stirring frequency for 60 to 90 minutes after the addition is completed, then adjusting the stirring frequency to 15 to 18 Hz, adding cosolvent, wetting agent, thickener and remaining water in turn, stirring for 10 to 15 minutes after the addition is completed, to obtain the main agent.

[0058] The present invention has no special limitation on the preparation method of the composite curing agent. The components can be uniformly mixed. Specifically, the curing agent and water can be added to the film-forming aid in sequence. After the addition is completed, the mixture is stirred for 5 to 10 minutes at a stirring frequency of 10 to 15 Hz to obtain the composite curing agent.

[0059] The present invention provides the use of the two-component separated hot water-based paint described in the above technical solution or the two-component separated hot water-based paint prepared by the preparation method described in the above technical solution in a thermal insulation coating.

[0060] The technical solutions in the present invention will be described clearly and completely below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0061] The strontium titanate nanoparticles used in the examples and comparative examples of the present invention are products prepared in Preparation Examples 1 to 3; the sources of other raw materials are specifically shown in Table 1.

[0062] Table 1 Source of raw materials

[0063]

[0064]

[0065] Preparation Example 1

[0066] The steps for preparing irregular strontium titanate are as follows:

[0067] Mixing palmitic acid, ethylene glycol, 1,2-butanediol and water to obtain a composite morphology regulator, wherein the concentration of palmitic acid in the composite morphology regulator is 0.2wt%, the concentration of ethylene glycol is 1.2wt%, and the concentration of 1,2-butanediol is 1.6wt%; dropping a titanium tetrachloride aqueous solution with a concentration of 0.003g / mL into the composite morphology regulator, and the volume ratio of the composite morphology regulator to the titanium tetrachloride aqueous solution is 1:2, stirring for 30min, and cooling with ice water during the stirring process to obtain a mixed solution I;

[0068] The mixed solution I, a sodium hydroxide aqueous solution with a concentration of 0.033 g / mL, and a strontium chloride hexahydrate aqueous solution with a concentration of 0.01 g / mL were mixed in a volume ratio of 3:3:1, and stirred for 30 minutes to obtain a mixed solution II with a pH value of 14.2;

[0069] The mixed solution II was heated to 180°C at a heating rate of 4°C / min for a hydrothermal reaction for 72 hours, and then cooled at a cooling rate of 2°C / min. The material after the hydrothermal reaction was centrifuged, and the precipitate was washed alternately with water and ethanol for 5 times, and finally dried at 80°C for 6 hours to obtain irregular strontium titanate.

[0070] Figure 1 This is a SEM image of irregular strontium titanate. The results show that the particle size of the irregular strontium titanate is 100-200nm.

[0071] Preparation Example 2

[0072] The steps for preparing octahedral strontium titanate are as follows:

[0073] Mixing palmitic acid, ethylene glycol, 1,2-butanediol and water to obtain a composite morphology regulator, wherein the concentration of palmitic acid in the composite morphology regulator is 0.2wt%, the concentration of ethylene glycol is 1wt%, and the concentration of 1,2-butanediol is 0.2wt%; dropping a titanium tetrachloride aqueous solution with a concentration of 0.003g / mL into the composite morphology regulator, and the volume ratio of the composite morphology regulator to the titanium tetrachloride aqueous solution is 1:2, stirring for 30 minutes, and cooling with ice water during the stirring process to obtain a mixed solution I;

[0074] The mixed solution I, a sodium hydroxide aqueous solution with a concentration of 0.033 g / mL, and a strontium chloride hexahydrate aqueous solution with a concentration of 0.01 g / mL were mixed in a volume ratio of 3:3:1, and stirred for 30 minutes to obtain a mixed solution II with a pH value of 14.2;

[0075] The mixed solution II was heated to 190°C at a heating rate of 4°C / min for a hydrothermal reaction for 24 hours, and then cooled at a cooling rate of 2°C / min. The material after the hydrothermal reaction was centrifuged, and the precipitate was washed alternately with water and ethanol for 3 times, and finally dried at 80°C for 6 hours to obtain octahedral strontium titanate.

[0076] Figure 2 This is a SEM image of octahedral strontium titanate. The results show that the particle size of octahedral strontium titanate is 50 to 170 nm.

[0077] Preparation Example 3

[0078] The steps for preparing hexahedral titanic acid are as follows:

[0079] Mixing palmitic acid, ethylene glycol, 1,2-butanediol and water to obtain a composite morphology regulator, wherein the concentration of palmitic acid in the composite morphology regulator is 0.2wt%, the concentration of ethylene glycol is 0.2wt%, and the concentration of 1,2-butanediol is 2wt%; dropping a titanium tetrachloride aqueous solution with a concentration of 0.003g / mL into the composite morphology regulator, and the volume ratio of the composite morphology regulator to the titanium tetrachloride aqueous solution is 1:2, stirring for 30 minutes, and cooling with ice water during the stirring process to obtain a mixed solution I;

[0080] The mixed solution I, a lithium hydroxide aqueous solution with a concentration of 0.033 g / mL, and a strontium hydroxide aqueous solution with a concentration of 0.01 g / mL were mixed in a volume ratio of 3:3:1, and stirred for 15 minutes to obtain a mixed solution II with a pH value of 13.8;

[0081] The mixed solution II was heated to 180°C at a heating rate of 4°C / min for hydrothermal reaction for 48 hours, and then cooled at a cooling rate of 2°C / min. The material after the hydrothermal reaction was centrifuged, and the precipitate was washed alternately with water and ethanol for 5 times, and finally dried at 90°C for 4 hours to obtain hexahedral strontium titanate.

[0082] Figure 3 This is a SEM image of hexahedral strontium titanate. The results show that the particle size of the hexahedral strontium titanate is 200-300nm.

[0083] Example 1

[0084] Prepare the main agent according to the formula in Table 2, the steps are as follows:

[0085] (1) By mass, 10 parts of water and 0.1 parts of bentonite were mixed. EW was stirred at a stirring frequency of 15 Hz for 20 minutes. At this time, the mixture had no lumps and was in a uniform paste. The mixture was stirred with a paint knife and no opaque particles were observed. Then, 5 parts of rutile titanium dioxide R-996 (accounting for 25% of the total mass of rutile titanium dioxide R-996), 1 part of defoamer (0.3 parts of NOPCONXZ, 0.3 parts of FoamasterMO 2157 and 0.4 parts of BYK-011), and 15 parts of rutile titanium dioxide R-996 (accounting for 75% of the total mass of rutile titanium dioxide R-996) were added to the mixture in sequence at a stirring frequency of 18 Hz. After each component was added, it was stirred for 5 minutes before the next component was added. Finally, 0.12 parts of octahedral strontium titanate were added. After all the raw materials were added, they were stirred for 20 minutes to obtain a pre-refined slurry.

[0086] (2) placing the pre-refined slurry in a grinder and grinding it at a rotation speed of 3500 rpm, controlling the grinding temperature to be less than 50° C. and the grinding pressure to be less than 0.2 MPa during the grinding process, and after grinding for 90 minutes, obtaining a grinding slurry with a fineness of less than 30 μm;

[0087] (3) The grinding slurry is transported to a blending tank, and then 50 parts of water-based epoxy resin Beckopox EP37 are added to the blending tank containing the grinding slurry, and stirred for 5 minutes at a stirring frequency of 18 Hz, and then 10 parts of filler sericite powder GA-1 are added and the stirring frequency is increased to 29 Hz. After the addition is completed, the above stirring frequency is maintained and continued to stir for 90 minutes, and then the stirring frequency is adjusted to 18 Hz, and 1 part of cosolvent DPMS2310 and 0.5 parts of wetting agent TEGO TWIN 4100 are added in sequence, and finally 0.1 parts of thickener BorchiGel0620 and 10 parts of water are added to adjust the viscosity to 1760 cP. After the addition is completed, stir for 10 minutes to obtain the main agent;

[0088] The composite curing agent was prepared by sequentially adding 16 parts of curing agent Beckopox VEHEH64, 34 parts of curing agent Beckopox VEHEH29 and 20 parts of water to 25 parts of film-forming aid PMS310 and 5 parts of film-forming aid S240 (BCS), and after all the raw materials were added, stirring was performed at a stirring frequency of 15 Hz for 10 minutes to obtain the composite curing agent;

[0089] The main agent and the composite curing agent are compounded in a mass ratio of 5:1 to obtain a two-component thermal insulation coating.

[0090] Table 2 Main agent formula in Example 1

[0091]

[0092] Example 2

[0093] The two-component separation thermal coating was prepared according to the method of Example 1, except that the main agent formula in this example is shown in Table 3.

[0094] Table 3 Main agent formula in Example 2

[0095]

[0096] Example 3

[0097] The two-component separation thermal coating was prepared according to the method of Example 1, except that the main agent formula in this example is shown in Table 4.

[0098] Table 4 Main agent formula in Example 3

[0099]

[0100]

[0101] Example 4

[0102] The two-component separation thermal coating was prepared according to the method of Example 1, except that the main agent formula in this example is shown in Table 5.

[0103] Table 5 Main agent formula in Example 4

[0104]

[0105] Example 5

[0106] The two-component separation thermal coating was prepared according to the method of Example 1, except that the main agent formula in this example is shown in Table 6.

[0107] Table 6 Main agent formula in Example 5

[0108]

[0109] Example 6

[0110] The two-component separation thermal coating was prepared according to the method of Example 1, except that the main agent formula in this example is shown in Table 7.

[0111] Table 7 Main agent formula in Example 6

[0112]

[0113]

[0114] Example 7

[0115] The two-component separation thermal coating was prepared according to the method of Example 1, except that the main agent formula in this example is shown in Table 8.

[0116] Table 8 Main agent formula in Example 7

[0117]

[0118] Example 8

[0119] The two-component separation thermal coating was prepared according to the method of Example 1, except that the main agent formula in this example is shown in Table 9.

[0120] Table 9 Main agent formula in Example 8

[0121]

[0122]

[0123] Example 9

[0124] A two-component separation thermal coating was prepared according to the method of Example 1, the only difference being that the main agent formula in this example is as shown in Table 10.

[0125] Table 10 Main agent formula in Example 9

[0126]

[0127] Comparative Example 1

[0128] A two-component thermal insulation coating was prepared according to the method of Example 1, except that octahedral strontium titanate was omitted from the main agent formula of this comparative example.

[0129] Comparative Example 2

[0130] The two-component thermal insulation coating was prepared according to the method of Example 1, except that the amount of octahedral strontium titanate added in the main agent formula of this comparative example was 1.0 part.

[0131] Test Case

[0132] The coatings prepared in Examples 1 to 9 and Comparative Examples 1 to 2 were sprayed on the surface of A4 tinplate as a sample, and then placed in a homemade heat preservation box (refer to Standard Test Method for Predicting Heat Building in PVC Building Products), and a 250W incandescent lamp was used to simulate sunlight irradiation. A temperature detection instrument was placed in the box of the heat preservation box, and the temperature detection instrument was fixed on the foam board. The distance between the incandescent lamp and the sample was 40 cm. The heat insulation performance of the coating was detected by observing and comparing the initial temperature of the sample, the temperature after irradiation for 30 minutes, the temperature after irradiation for 60 minutes, and the light retention rate of the sample before and after irradiation. The specific results are shown in Table 11. It can be seen from Table 11 that the morphology and addition amount of strontium titanate nanoparticles have different effects on the change of the temperature of the tinplate. Among them, the heat insulation performance of the double-component separated hot water-based coating in Example 7 is the best, and the heat insulation performance is improved by 30% compared with the water-based coating using only titanium dioxide as a pigment. However, adding too much strontium titanate nanoparticles (Comparative Example 2) will affect the light transmittance and gloss of the two-component water-insulating coating itself. Therefore, the two-component water-insulating coating prepared by the present invention using appropriate amounts of strontium titanate nanoparticles and titanium dioxide as pigments has significant heat-insulating properties, and the preparation method is simple and easy.

[0133] Table 11 Test results of coating properties prepared in Examples 1 to 9 and Comparative Examples 1 to 2

[0134]

[0135]

[0136] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A two-component separated hot water paint, comprising a main agent and a composite curing agent packaged separately; In parts by mass, the main agent consists of the following components: Resin 50-65 parts; Pigment 10-21 parts; Filler 10-20 parts; Bentonite 0.1-0.2 parts; Defoamer 0.1-1.0 parts; Wetting agent 0.1-1.0 parts; Thickener 0.1-1.0 parts; Cosolvent 1-2 parts; Water 10-20 parts; The pigment is titanium dioxide and strontium titanate nanoparticles, and the mass of the strontium titanate nanoparticles is 0.1-0.9% of the total mass of the main agent.

2. The two-component separated hot water paint according to claim 1, characterized in that: The strontium titanate nanoparticles include one or more of octahedral strontium titanate, hexahedral strontium titanate and irregular strontium titanate; the particle size of the strontium titanate nanoparticles is 50-300nm.

3. The two-component separated hot water paint according to claim 1, characterized in that: The titanium dioxide includes rutile titanium dioxide and / or anatase titanium dioxide.

4. The two-component separated hot water paint according to claim 1, characterized in that: The resin is a water-based epoxy resin, and the water-based epoxy resin includes one or more of water-based epoxy resin STW602, water-based epoxy resin EP7520 and water-based epoxy resin Beckopox EP37.

5. The two-component separated hot water paint according to claim 1, characterized in that: The filler includes sericite powder; The defoamer comprises at least two of the defoamer NOPCONXZ, the defoamer FoamasterMO 2157 and the defoamer BYK-011; The wetting agents include wetting agent TEGO TWIN 4100, wetting agent BYK-220SN, wetting agent One or more of VXW6208 and wetting agent WE3229; The thickener includes one or more of thickener BorchiGel0620, thickener BYK-420 and thickener VXW6388; The co-solvent includes co-solvent DPMS2310 and / or co-solvent S312.

6. The two-component separated hot water paint according to claim 1, characterized in that: The composite curing agent comprises a curing agent, a film-forming aid and water. The mass ratio of the curing agent, the film-forming aid and the water in the composite curing agent is 50-75:30-35:20-25.

7. The two-component separated hot water paint according to claim 6, characterized in that: The curing agent includes curing agent Beckopox VEHEH64 and / or curing agent Beckopox VEHEH29; The film-forming aid includes film-forming aid PMS310 and / or film-forming aid S240.

8. The two-component separated hot water paint according to any one of claims 1 to 7, characterized in that: The mass ratio of the main agent to the composite curing agent is 3 to 6:

1.

9. The method for preparing the two-component separated hot water-based paint according to any one of claims 1 to 8, characterized in that: The preparation method of the main agent comprises the following steps: Mixing bentonite, pigment, defoamer and part of water, and performing pre-mixing and grinding in sequence to obtain grinding slurry; The grinding slurry, resin, filler, cosolvent, wetting agent, thickener and remaining water are mixed and blended to obtain the main agent.

10. Use of the two-component separated hot water-based paint according to any one of claims 1 to 8 or the two-component separated hot water-based paint prepared by the preparation method according to claim 9 in thermal insulation coatings.

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