CN112680014A - Reflective heat insulation sand-in-water coating and preparation method thereof - Google Patents
Reflective heat insulation sand-in-water coating and preparation method thereof Download PDFInfo
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Abstract
The invention relates to a reflective heat-insulating sand-in-water coating, which comprises a protective adhesive, a color-mixing base paint and a continuous phase, wherein the protective adhesive comprises the following components in parts by weight: the protective glue comprises protective glue powder; the color-mixing base paint comprises emulsion, titanium dioxide, microcapsule phase-change materials, artificial colored sand and hollow microspheres; the continuous phase comprises a composite emulsion and a reflective heat insulation auxiliary agent; the composite emulsion is a mixture of one of pure acrylic emulsion, silicone acrylic emulsion or acrylate copolymer emulsion and aqueous polyurethane phase-change emulsion. The reflective heat-insulation sand-in-water coating has the characteristics of high reflectivity and excellent heat insulation effect.
Description
Technical Field
The invention belongs to the field of coatings, and particularly relates to a reflective heat insulation sand-in-water coating and a preparation method thereof.
Background
As is well known, the stone-like paint has texture and high cost performance, but the stone-like effect is poor, and because the raw material is natural colored sand, the natural texture like marble cannot be imitated; the water-in-water stone imitation effect is good, and compared with the real stone effect, the real and false stone imitation effect is hard to distinguish, but the water-in-water stone imitation effect is smooth in plane and has no texture. The sand-in-water multicolor paint is a novel high-grade exterior wall decorative paint following water-in-water multicolor paint and stone-like paint, and combines the advantages of the multicolor paint and the stone-like paint. The method of coating the natural colored sand in the water-in-water colored dots is adopted, so that the colorful paint has the high simulation degree of colorful paint and the texture of natural real stone paint.
At present, building energy conservation is one of the key jobs of energy conservation work in China, and external wall heat preservation becomes a main product of building energy conservation. The coating which is coated on the outer wall of the building and plays a role in heat insulation is called as heat insulation coating, which mainly comprises three types of barrier heat insulation coating, reflective heat insulation coating and radiation heat insulation coating, and in order to meet the higher and higher coating requirements, the sand-in-water coating with the reflective heat insulation function is developed.
The invention patent CN106280806A 'aqueous reflective heat-insulating water sand-coated litchi-like top coat and a preparation method thereof' discloses a sand-in-water coating, wherein reflective heat-insulating substances are reflective heat-insulating titanium and emissive heat-insulating color paste; the invention patent CN108912903A 'sand-in-water heat-insulation colorful paint and a preparation method thereof' discloses a sand-in-water paint, wherein a reflective heat-insulation substance is reflective heat-insulation titanium white; the invention patent CN109082183A 'a reflection type light sand-in-water colorful and a preparation method thereof' discloses a reflection type light sand-in-water coating, wherein the patent does not mention a reflection heat insulation raw material, and mentions that light sand sintered by inorganic pigment is used as a disperse phase, so that a product can be coated to a thinner thickness to obtain a good reflection heat insulation effect; the invention patent CN108219562A 'sunlight heat reflection heat insulation water-coated sand colorful environment-friendly coating and a preparation method thereof' discloses a reflection heat insulation sand-in-water coating, wherein reflection heat insulation materials are heat insulation powder, reflection titanium white and reflection pigment, and meanwhile, ceramic hollow microspheres are contained in colorful particles, and the microspheres have the effect similar to double-layer glass and play the roles of heat insulation.
However, the prior art reported in the above patent has the following problems: the system provided by the invention patent CN109082183A is different from a water-in-sand system circulating in the market, the system is added into a base material after the protective glue wraps color sand, the painted surface effect after spraying cannot imitate the natural texture of marble, the surface effect is similar to the texture paint circulating in the market, and 50% of light color sand floats on water, so that manual stirring is needed during construction, and the uniformity of the paint in a spray can during spraying is difficult to ensure due to the characteristics of the light sand; the invention patents CN106280806A, CN109082183A and CN108219562A all use reflective heat insulation titanium white, because of the addition of titanium white, the covering power of color points is strong, the sand-in-water system is suitable for light color system, stone with darker color is difficult to imitate, the cost control of construction sites at present is very strict, the sprayed sand-in-water is not fully sprayed, namely the middle coating is not covered completely, and the left gap has negative influence on the overall reflective heat insulation of the outer wall; the invention patent CN108912903A simultaneously discloses a preparation method of the intermediate coating, but the titanium white content of the intermediate coating is more than 20%, and the intermediate coating is suitable for light color systems according to the judgment of the prior experience, and the consumption of color paste is larger and the cost is higher.
In conclusion, the development of a sand-in-water coating with high reflectivity and heat insulation and preservation effects is urgently needed, and therefore, the invention provides a reflective heat insulation sand-in-water coating and a preparation method thereof.
Disclosure of Invention
In order to solve the above problems, an object of the present invention is to provide a reflective insulation sand-in-water coating, which is realized by the following technical solutions:
a reflective thermal insulation sand-in-water coating comprising a protective gum, a tinting base paint, and a continuous phase, wherein:
the protective glue comprises protective glue powder;
the color-mixing base paint comprises emulsion, titanium dioxide, microcapsule phase-change materials, artificial colored sand and hollow microspheres;
the continuous phase comprises a composite emulsion and a reflective heat insulation auxiliary agent;
the composite emulsion is a mixture of one of pure acrylic emulsion, silicone acrylic emulsion and acrylate copolymer emulsion and aqueous polyurethane phase-change emulsion.
Further, the reflective heat-insulation sand-in-water coating comprises a protective adhesive, a toning base paint and a continuous phase, wherein the reflective heat-insulation sand-in-water coating comprises the following components in parts by mass:
the protective glue comprises 75-95 parts of water, 0.1-3 parts of a dispersing agent, 0.1-5 parts of a viscosity reducer, 0.1-4 parts of a mildew inhibitor, 0.1-3 parts of a bactericide, 2-20 parts of protective glue powder, 0.1-1 part of a pH regulator and 0.1-1 part of an anti-settling agent.
The dispersant is OROTAN 731A, which is a general-purpose sodium polycarboxylate dispersant;
the viscosity reducer is sodium pyrophosphate, and the molecular formula is Na4P2O7·10H2O, is a white or colorless crystalline powder;
the mildew preventive is MERGAL 786, and is an isothiazolinone bactericide;
the bactericide is MERGAL K9N, is a broad-spectrum in-tank bactericide, and does not contain solvent and formaldehyde;
the protective rubber powder consists of magnesium aluminum silicate and magnesium lithium silicate;
the pH regulator is one of AMP-95 of the Dow chemical and Butylethanolamine of the Amydad, or a mixture of the AMP-95 and Butylethanolamine of the Amydad according to a certain proportion;
the anti-settling agent is the Pasteur Attagel 40, the main component is attapulgite, the suspension property of the coating can be improved, the dispersion is easy, the water-coated sand has good thixotropic property when the viscosity is low, and the color dots do not settle.
The toning base paint comprises 45-65 parts of water, 0.1-0.5 part of mildew inhibitor, 0.1-1 part of dispersant, 0.5-1 part of cellulose, 5-10 parts of filler, 0.1-5 parts of titanium pigment, 0.5-1.5 parts of defoamer, 0.1-0.8 part of pH regulator, 15-45 parts of emulsion, 0.5-1.5 parts of film-forming assistant, 0.5-1.5 parts of antifreeze, 0.1-1 part of bactericide, 1-5 parts of microcapsule phase-change material, 0.1-0.8 part of thickener, 3-5 parts of gel liquid and 40-50 parts of artificial colored sand, and 40-50 parts of hollow microspheres.
The mildew preventive is MERGAL 786, and is an isothiazolinone bactericide;
the dispersant is OROTAN 731A, which is a general-purpose sodium polycarboxylate dispersant;
the cellulose is one of hydroxyethyl cellulose 250HBR or hydroxyethyl cellulose HS10W, or the mixture of the two is mixed according to a certain proportion;
the filler is kaolin DB-80 which is the main mineralThe component is kaolinite, and the molecular formula is Al2O3·SiO2·2H2O；
The antifoaming agent is FoamStar A10 from Corning;
the pH regulator is one of AMP-95 of the Dow chemical and Butylethanolamine of the Amydad, or is formed by mixing the AMP-95 and Butylethanolamine of the Amydad according to a certain proportion;
the emulsion is one or more of silicone-acrylic emulsion, styrene-acrylic emulsion and ethylene-polyvinyl acetate emulsion;
the film-forming additive is 2,2, 4-trimethyl-1, 3-pentanediol monoisobutyrate;
the antifreezing agent is propylene glycol produced by the ocean chemical industry;
the bactericide is MERGAL K9N, and is a broad-spectrum in-tank bactericide;
the microcapsule phase change material is a polyurea microcapsule phase change material which is prepared by wrapping butyl stearate by taking a reactant of toluene diisocyanate and tetraethylenepentamine as a wall material, can generate phase change at the temperature of more than 30 ℃ so as to absorb certain heat, and can reversely react at the temperature of less than 30 ℃ so as to release the stored heat.
The thickening agent is ACRYSOL TT-935 which is a hydrophobically modified alkali soluble emulsion type thickening agent;
the gel solution is a BYK-Laponite S482 aqueous solution with the mass fraction of 7% -10%.
The continuous phase comprises 5-10 parts of water, 0.1-0.5 part of activated bentonite, 55-65 parts of composite emulsion, 3-10 parts of film-forming additive, 5-10 parts of antifreezing agent, 10-15 parts of heat-clearing shield SP-105A, 0.1-0.5 part of pH regulator and 0.1-0.8 part of thickening agent.
The activated bentonite is prepared by modifying common calcium bentonite after activation treatment with an organic cationic surfactant, can improve the thixotropy of a continuous phase after being added, and simultaneously has a synergistic effect with an anti-settling agent in a protective adhesive, so that sand-in-water color particle settling can be prevented to a certain extent.
The film-forming additive is 2,2, 4-trimethyl-1, 3-pentanediol monoisobutyrate;
the antifreezing agent is propylene glycol produced by the ocean chemical industry;
the reflective heat-insulation auxiliary agent is a heat shield SP-105A, is a high-molecular polymer capable of reflecting heat energy, has an average particle size of less than 5 mu m, does not chemically react with other components in the coating, has stable properties, can reflect heat energy from sunlight together with other reflective heat-insulation components in the coating, and has a reflectivity of 92.2% at most, wherein the visible light reflectivity of 98.8% at most;
the pH regulator is one or two mixtures of AMP-95 of the Dow chemical and Butylethanolamine of the Amydad according to a certain proportion;
the thickening agent is ACRYSOL TT-935, which is a hydrophobically modified alkali soluble emulsion type thickening agent.
Further, the titanium dioxide is selected from Japanese stone powder PFR-404 or SG-101, wherein PFR-404 is suitable for light-color paint, and SG-101 is suitable for dark-color paint.
Further, the hollow microsphere comprises TiO2、SiO2And Al2O3A mixture of (a).
Further, the average particle size of the cenospheres is 18.4-20 μm; the wall thickness of the hollow microsphere is 1-2 μm.
Further, the composite emulsion is one of pure acrylic emulsion, silicone acrylic emulsion or acrylate copolymer emulsion, and is a mixture compounded with the waterborne polyurethane phase-change emulsion in a mass ratio of 1:5-1: 2.
Another object of the present invention is to provide a preparation method of the reflective insulation sand-in-water coating, which comprises:
the preparation method of the artificial colored sand comprises the following steps:
s1, dissolving a titanate coupling agent in alcohol, adding bis-hydroxyethyl amine, uniformly stirring, adding nano titanium dioxide, and stirring to obtain a component A;
dissolving acid and alcohol in water to obtain a component B;
s2, dropwise adding the component B into the component A to obtain an intermediate product;
s3, adding an intermediate product into the colored sand to enable the colored sand to be wetted by the intermediate product, and then drying the colored sand under stirring to obtain a precursor;
s4, sintering the precursor to obtain a crude product 3;
s5, repeating the steps S3-S4 on the crude product to obtain the artificial colored sand.
The preparation method of the waterborne polyurethane phase-change emulsion comprises the following steps:
s1, uniformly stirring anhydrous diphenylmethane diisocyanate and polydihydric alcohol at 55-65 ℃, and adding a solvent;
s2, adding anhydrous dimethylolpropionic acid and a catalyst, and reacting at 55-65 ℃;
s3, adding dihydric alcohol, reducing the heating temperature to 25-35 ℃, adding trialkylamine, continuing to stir for 0.5h, finally adding excessive alkyl diamine to react with-NCO groups, and distilling the solvent under reduced pressure to obtain the waterborne polyurethane phase-change emulsion.
Further, the trialkylamine is selected from triethylamine or trimethylamine.
Further, the alkyl diamine is selected from ethylene diamine or propylene diamine.
Further, the catalyst is dibutyltin dilaurate.
The invention has the beneficial effects that:
(1) the invention adopts titanium dioxide to reduce the consumption of color paste during color mixing and reduce the cost of the product; the type of the color paste is not limited, namely the color paste can be mixed by using common color paste, and the color paste is not limited to reflective heat insulation color paste; preferably, two titanium dioxide are provided, so that the base paint can be modulated into light color or dark color according to different stones, and sand-in-water can imitate stones with more colors without being limited to a light color system;
(2) the invention provides a preparation method of reflective heat-insulation artificial colored sand, and the artificial colored sand is applied to a color mixing foundation to solve the problem of reflectivity reduction caused by small using amount of reflective heat-insulation titanium dioxide, and meanwhile, the hollow microspheres and microcapsule phase-change materials are added to ensure that the sand-in-water coating has good heat insulation effect after being sprayed;
(3) the invention provides a preparation method of a reflective heat insulation sand-in-water coating, the emulsion is used as one of the components of continuous phase emulsion, a continuous transparent film can be formed in sand-in-water color points and color point uncovered areas after spraying, the polyurethane film is a phase change material, when the surface temperature of the film reaches 30 ℃, the internal structure generates solid-solid phase change to absorb heat, and when the surface temperature of the film is reduced, the internal structure generates reversible phase change to release heat, thereby achieving the temperature regulation function of regulating the covered part of the film.
(4) The reflective heat insulation auxiliary agent is used in the continuous phase, the continuous phase covers the colored dots and the parts which are not covered by the colored dots after film forming, the reflectivity of the continuous phase after film forming is enhanced by the aid of the reflective heat insulation auxiliary agent, the reflective heat insulation auxiliary agent and other reflective heat insulation components in the reflective heat insulation auxiliary agent play a synergistic role, the overall reflective heat insulation efficiency after sand-in-water spraying is improved, and even when the spraying amount is less, the reflective heat insulation auxiliary agent can still play a good role in reflective heat insulation.
Detailed Description
In order to more clearly illustrate the technical solution of the present invention, the following examples are given. The starting materials, reactions and work-up procedures which are given in the examples are, unless otherwise stated, those which are customary on the market and are known to the person skilled in the art.
The microcapsule phase change material used in the embodiment is a polyurea microcapsule phase change material which is prepared by wrapping butyl stearate with a reactant of toluene diisocyanate and tetraethylenepentamine as a wall material, can generate phase change at the temperature of more than 30 ℃ so as to absorb certain heat, and can reversely react at the temperature of less than 30 ℃ so as to release the stored heat. The preparation steps refer to the preparation of phase-change microcapsules and the application research thereof in paint in the document of Yangbei Ming Hei.
The activated bentonite is prepared by modifying common calcium bentonite after activation treatment by using an organic cationic surfactant, can improve the thixotropy of a continuous phase after being added, and simultaneously has a synergistic effect with an anti-settling agent in a protective adhesive, so that the sand-in-water color particle settling can be prevented to a certain extent. Purchased from Shanghai grid International trade, Inc.; the model is J-20.
Examples
Note: the above "parts" are all parts by mass.
The preparation method of the artificial colored sand of the above embodiments 1 to 3 comprises the following steps:
s1, dissolving 50 parts of titanate coupling agent in 20 parts of absolute ethyl alcohol according to parts by weight, magnetically stirring at the rotating speed of 500rpm, adding 20 parts of bis-hydroxyethyl amine, uniformly stirring, slowly adding 90 parts of nano titanium dioxide, and stirring at a high speed of 800rpm to obtain a component A;
dissolving sulfuric acid and absolute ethyl alcohol in water (sulfuric acid: absolute ethyl alcohol: water ═ 10:90:9, v/v/v) to obtain a component B;
s2, dropwise adding the component B into the component A to obtain an intermediate product, wherein the mass part ratio of the component A to the component B is controlled to be 4: 1;
s3, adding 15 parts of the intermediate product into 85 parts of 80-mesh colored sand to wet the colored sand by the intermediate product, then stirring at 800rpm to prevent the colored sand from caking in the drying process, and drying the colored sand to obtain a precursor;
s4, placing the precursor in a 600 ℃ muffle furnace to be sintered for 3h to obtain a crude product;
and S5, repeating the steps S3-S4 on the crude product for 3 times in total, and wrapping a layer of nano titanium dioxide on the surface of the colored sand to obtain the artificial colored sand.
The raw materials and preparation method of the aqueous polyurethane phase-change emulsion of the above examples 1 to 3 are as follows:
s1, according to the mass parts, 100 parts of polyethylene glycol (the number average molecular weight is 2000) and 100 parts of dimethylolpropionic acid are subjected to vacuum dehydration for 3 hours at the temperature of 110 ℃; putting 100 parts of diphenylmethane diisocyanate into a three-neck flask, adding weighed polyethylene glycol, stirring at 55 ℃ for 1h, and adding a proper amount of ethyl acetate to adjust the viscosity of the system;
s2, adding 20 parts of anhydrous dimethylolpropionic acid, dropwise adding a catalytic amount of dibutyltin dilaurate serving as a catalyst, and reacting at 55 ℃ for 3 hours;
s3, adding 20 parts of 1, 4-butanediol to react for 0.5h, reducing the heating temperature to 25 ℃, adding 20 parts of triethylamine, continuously stirring for 0.5h, and weighing a small amount of reaction solution;
s4, determining the-NCO residual amount according to the relevant regulations in HG/T2409-1992, adding a little excessive ethylenediamine to consume the residual-NCO groups, increasing the stirring speed, calculating the required dosage of deionized water according to the solid content set by the emulsion by 38%, slowly adding the deionized water, violently stirring for 1h, and then carrying out reduced pressure distillation to remove ethyl acetate and recycling to obtain the waterborne polyurethane phase-change emulsion.
In examples 1-3 above:
the preparation method of the protective adhesive comprises the following steps:
(1) respectively adding deionized water into a proper container according to the mass parts of each embodiment, and starting stirring;
(2) adding the dispersant, the viscosity reducer, the mildew preventive, the bactericide and the pH regulator under stirring at 300rpm, and stirring for 1 min;
(3) adding protective rubber powder and anti-settling agent under the stirring of 1300rpm, and stirring for 30 min;
(4) and filling the protective glue into a proper container for standby.
The preparation method of the toning base paint comprises the following steps:
(1) adding deionized water into a container according to the mass parts of each embodiment, and starting stirring;
(2) uniformly and slowly adding the mildew preventive and the dispersant under the stirring of 300rpm, and stirring for 1 min;
(3) adding cellulose and stirring for 5min under stirring of 600 rpm;
(4) slowly adding the filler, the titanium dioxide, the defoaming agent and the pH regulator under the stirring of 700rpm, adjusting the rotating speed to 1200rpm after the addition is finished, and stirring for 20 min;
(5) under the stirring of 1000rpm, the emulsion, the film forming additive, the antifreezing agent, the bactericide and the microcapsule phase change material are sequentially and slowly added, and the stirring is carried out for 5 min;
(6) adding the thickening agent under stirring at 1000rpm, and stirring for 3 min;
(7) adding the gel liquid at 1200rpm, stirring for 2min, starting a container humidifying device after stirring uniformly, stopping stirring, and standing for 12h to enable the materials to react fully;
(8) after standing, starting stirring, and adding artificial colored sand and hollow microspheres at 1100rpm to stir uniformly;
(9) the tinted base paint is filled into suitable containers for future use.
The preparation of the continuous phases of examples 1-3 above was carried out by the following method:
(1) adding deionized water into a proper container according to the mass parts of each example;
(2) adding activated bentonite under stirring at 900rpm, and stirring for 20 min;
(3) sequentially adding the composite emulsion, the film-forming assistant, the antifreezing agent and the Shuenthun SP-105A, pH regulator under stirring at 300rpm, and stirring for 10 min;
(4) under stirring at 900rpm, the thickener was slowly added and stirred for 5 min.
(5) The continuous phase is filled into suitable containers for use.
The preparation methods of the reflective heat insulation sand-in-water coating of the above examples 1 to 3 are all as follows:
(1) weighing the toning base paint, the protective adhesive and the continuous phase in sequence according to the mass ratio of 50:20:15 for later use;
(2) adding the toning base paint into the protective adhesive for granulation;
(3) and adding the continuous phase after uniformly stirring, and stirring and filling after uniformly stirring.
Test example
The reflective heat insulation sand-in-water coating prepared in the examples 1-3 is detected according to the relevant standards in JG/T235-2014 reflective heat insulation coating for buildings, and the test results are shown in Table 1:
TABLE 1
The reflective heat insulation sand-in-water coating prepared in examples 1-3 was tested according to the relevant standards in HG/T4343-:
TABLE 2
The data in tables 1 and 2 indicate that: the product developed by the invention meets the performance requirements in reflective thermal insulation coatings for buildings and waterborne multicolor architectural coatings. The reflective heat-insulation sand-in-water coating is prepared by reasonably applying materials, and can be used for engineering outer walls to play a role in heat insulation. Compare in current patent product, this product can be according to the different colours of the different adjustment of stone material, reaches excellent imitative stone effect. Meanwhile, the product has excellent washing resistance and artificial climate aging resistance, and can achieve the effect of more than ten years of quality assurance.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (10)
1. A reflective heat-insulating sand-in-water coating is characterized by comprising a protective adhesive, a toning base paint and a continuous phase, wherein:
the protective glue comprises protective glue powder;
the color-mixing base paint comprises emulsion, titanium dioxide, microcapsule phase-change materials, artificial colored sand and hollow microspheres;
the continuous phase comprises a composite emulsion and a reflective heat insulation auxiliary agent;
the composite emulsion is a mixture of one of pure acrylic emulsion, silicone acrylic emulsion and acrylate copolymer emulsion and aqueous polyurethane phase-change emulsion.
2. The reflective insulation sand-in-water coating of claim 1, comprising a protective glue, a toning base paint and a continuous phase, wherein the protective glue comprises the following components in parts by mass:
the protective glue comprises 75-95 parts of water, 0.1-3 parts of a dispersing agent, 0.1-5 parts of a viscosity reducer, 0.1-4 parts of a mildew inhibitor, 0.1-3 parts of a bactericide, 2-20 parts of protective glue powder, 0.1-1 part of a pH regulator and 0.1-1 part of an anti-settling agent;
the toning base paint comprises 45-65 parts of water, 0.1-0.5 part of mildew inhibitor, 0.1-1 part of dispersant, 0.5-1 part of cellulose, 5-10 parts of filler, 0.1-5 parts of titanium pigment, 0.5-1.5 parts of defoamer, 0.1-0.8 part of pH regulator, 15-45 parts of emulsion, 0.5-1.5 parts of film-forming assistant, 0.5-1.5 parts of antifreeze, 0.1-1 part of bactericide, 1-5 parts of microcapsule phase-change material, 0.1-0.8 part of thickener, 3-5 parts of gel liquid, 40-50 parts of artificial colored sand and 40-50 parts of hollow microspheres;
the continuous phase comprises 5-10 parts of water, 0.1-0.5 part of activated bentonite, 55-65 parts of composite emulsion, 3-10 parts of film-forming additive, 5-10 parts of antifreezing agent, 10-15 parts of heat-clearing shield SP-105A, 0.1-0.5 part of pH regulator and 0.1-0.8 part of thickening agent.
3. The reflective heat-insulating sand-in-water coating according to claim 1, wherein the titanium pigment is one or two selected from the group consisting of PFR-404 and SG-101 of Japan Stone Material Ltd.
4. The reflective insulating sand-in-water coating of claim 1, wherein the cenospheres are comprised of TiO2、SiO2And Al2O3A mixture of (a).
5. The reflective insulating sand-in-water coating of claim 1, wherein the cenospheres have an average particle size of 18.4 to 20 μm; the wall thickness of the hollow microsphere is 1-2 μm.
6. The reflective heat-insulating sand-in-water coating as claimed in claim 1, wherein the composite emulsion is one of a pure acrylic emulsion, a silicone acrylic emulsion or an acrylate copolymer emulsion, and is a mixture compounded with the waterborne polyurethane phase-change emulsion in a mass ratio of 1:5-1: 2.
7. The method for preparing the reflective insulating sand-in-water coating according to any one of claims 1 to 6, wherein the method for preparing the reflective insulating sand-in-water coating comprises the following steps:
the preparation method of the artificial colored sand comprises the following steps:
s1, dissolving a titanate coupling agent in alcohol, adding bis-hydroxyethyl amine, uniformly stirring, adding nano titanium dioxide, and stirring to obtain a component A;
dissolving acid and alcohol in water to obtain a component B;
s2, dropwise adding the component B into the component A to obtain an intermediate product;
s3, adding the intermediate product into the colored sand to enable the colored sand to be wetted by the intermediate product, and then drying the colored sand under stirring to obtain a precursor;
s4, sintering the precursor to obtain a crude product;
s5, repeating the steps S3-S4 on the crude product to obtain artificial colored sand;
the preparation method of the waterborne polyurethane phase-change emulsion comprises the following steps:
s1, uniformly stirring anhydrous diphenylmethane diisocyanate and polydihydric alcohol at 55-65 ℃, and adding a solvent;
s2, adding anhydrous dimethylolpropionic acid and a catalyst, and reacting at 55-65 ℃;
s3, adding dihydric alcohol, reducing the heating temperature to 25-35 ℃, adding trialkylamine, continuing to stir for 0.5h, finally adding excessive alkyl diamine to react with-NCO groups, and distilling the solvent under reduced pressure to obtain the aqueous polyurethane phase-change emulsion; wherein the number of carbon atoms in the alkyl group is 1 to 10.
8. The method for preparing the reflective insulation sand-in-water coating according to claim 7, wherein the trialkylamine is selected from triethylamine and trimethylamine.
9. The method for preparing the reflective insulation sand-in-water coating according to claim 7, wherein the alkyl diamine is selected from ethylene diamine or propylene diamine.
10. The method for preparing the reflective insulating sand-in-water coating according to claim 7, wherein the catalyst is dibutyltin dilaurate.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113583531A (en) * | 2021-08-16 | 2021-11-02 | 广东涂百年新型材料有限公司 | Reflective heat-insulation real stone paint material and preparation method thereof |
| CN114806373A (en) * | 2022-05-10 | 2022-07-29 | 浙江禾欣新材料有限公司 | Phase change energy storage coating for automobile cab and preparation process thereof |
| CN115820028A (en) * | 2021-09-28 | 2023-03-21 | 立邦涂料（中国）有限公司 | Expandable hollow microsphere, novel hollow material and application of novel hollow material in sand-containing stone-like coating |
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