A radiation cooling polymer cement coating for recycling milky white glass powder and its preparation method and application

Abstract

The present invention discloses a radiation cooling polymer cement coating for recycling opalescent glass powder, and its preparation method and application, belonging to the technical field of coating compositions. The method of the present invention adopts modified opalescent glass powder, modified silicone acrylic emulsion, and is mixed with ordinary Portland cement, quartz powder, rheological agent, and binder. It has the advantages of a wide source of raw materials, low cost, and convenient process operation, which is conducive to scaled production and large-scale application. The prepared radiation cooling polymer cement coating has the characteristics of super hydrophobicity and high absorption rate of infrared radiation of sunlight. It has excellent self-cleaning ability and can effectively reduce the input of heat from sunlight to achieve the effect of radiation cooling. The coating is used to reduce heat input and has good application prospects in the fields of building temperature regulation, electronic equipment heat dissipation, and solar cell cooling.

Description

Technical Field

[0001] The present invention relates to the technical field of coating compositions, in particular to a radiation cooling polymer cement coating using recycled opalescent glass powder, and a preparation method and application thereof. Background Art

[0002] Entering the 21st century, with the rapid development of industry and the economy, energy, an essential material foundation for rapid human development, has been overconsumed, leading to a severe shortage of energy reserves. Other forms of energy are unlikely to replace existing conventional energy sources in the short term, posing an imminent energy crisis. Furthermore, in real life, with the advancement of science and technology, people's awareness of environmental protection is growing, and green, energy-saving, and pollution-free practices are becoming the preferred standards in industrial production and even daily life. Buildings account for a significant portion of the energy structure, accounting for approximately 40% of total energy consumption. Heating and cooling are the largest contributors to building energy consumption, accounting for 60% of total energy consumption. In coastal areas, summer cooling is the primary form of building energy consumption. Currently, air conditioning remains the most widely used cooling method in buildings. With rising living standards and the widespread use of air conditioning, the power consumption of air conditioning is increasing. In some large cities, residential air conditioning power consumption already exceeds 40% of the total electricity load. Against this backdrop, exploring new materials and methods for low-energy building cooling is of great significance.

[0003] Global warming and the energy crisis have become significant challenges limiting human development, and energy conservation and emission reduction are crucial solutions. Radiative cooling, as an energy-free cooling method, is gaining increasing attention from researchers. Radiating energy into outer space is a crucial mechanism for maintaining Earth's temperature. Radiative cooling efficiency depends on the spectral emissivity of an object's surface. By adjusting surface emissivity to improve efficiency, it can become an important passive cooling method with widespread applications in temperature regulation of buildings, heat dissipation for electronic devices, and cooling of solar cells.

[0004] However, traditional radiative cooling coatings lack self-cleaning capabilities, making it easy for dust and dirt to adhere to the surface of the radiative cooling coating, thereby reducing the cooling effect of the radiative cooling coating.

[0005] In order to solve this technical problem, the Chinese invention patent with publication number CN113025133A discloses a super-hydrophobic daytime passive radiation cooling porous membrane and a preparation method thereof. The preparation method comprises the following steps: (1) dispersing inorganic nanoparticles in water to prepare an inorganic nanoparticle dispersion; (2) adding a fluorine-containing group modifier to the inorganic nanoparticle dispersion, and magnetically stirring at 20-40°C for 15-24 hours to modify the inorganic nanoparticles to obtain a modified inorganic nanoparticle dispersion; the modified inorganic nanoparticles have a particle size distribution of 50-1000 nm; (3) dissolving an organic polymer in an organic solvent to form an organic polymer solution; (4) adding the modified inorganic nanoparticle dispersion to the organic polymer solution and dispersing it uniformly to form a precursor solution; (5) coating the precursor solution on a substrate and drying it to obtain a super-hydrophobic daytime passive radiation cooling porous membrane. The preparation method of the invention is simple and low-cost, and the obtained daytime passive radiation cooling porous membrane has super-hydrophobic self-cleaning ability. However, the drawback of this process is that the preparation of porous membranes is complicated, is greatly affected by the environment, and requires high technical personnel.

[0006] The Chinese invention patent with publication number CN111574878A provides a multi-layer radiation cooling coating and its preparation method, including an ultraviolet reflective topcoat, a visible light reflective middlecoat and a near-infrared reflective primer. The ultraviolet reflective topcoat contains an ultraviolet reflective material, the visible light reflective middlecoat contains a visible light reflective material, and the near-infrared reflective primer contains a near-infrared reflective material. The invention utilizes the synergistic effect of the ultraviolet reflective topcoat, the visible light reflective middlecoat and the near-infrared reflective primer to produce extremely high solar reflectivity and achieve ultra-high reflectivity of 0.23-2.5μm solar radiation. The process is simple, the cost is low, and it is suitable for special shapes and flat surfaces. It can be used in residential buildings, commercial buildings, industrial plants and other occasions, and has broad application prospects. However, the invention is developed for the use of building facilities, and its self-cleaning ability is insufficient in humid or water environments, and it has certain limitations.

[0007] Chinese invention patent publication number CN110305539A discloses a dual-function day / night radiant cooler and its preparation method. The device comprises a broad-spectrum, highly reflective metal substrate coated with an 8-14μm infrared selective radiation coating. The 8-14μm infrared selective radiation coating comprises a visible-infrared transparent polymer and a nano-functional composite with strong infrared selective radiation activity in the 8-14μm range, with the visible-infrared transparent polymer comprising 10% to 80% by weight. The nano-functional composite with strong infrared selective radiation activity in the 8-14μm range comprises nano-silicon dioxide, a rare earth silicate compound, and a molybdate compound in a mass ratio of 1:0.5-2:0.5-2. The device's excellent sunlight reflection and high 8-14μm radiation properties enable efficient, autonomous cooling in both sunny and dark conditions. It can be used for zero-energy cooling in buildings, grain and oil depots, high-power electronic equipment, refrigerated luggage, and other facilities, potentially offering significant energy savings. The radiation cooler of this invention relies on a reflective metal substrate to achieve high reflectivity, has a high application cost, and its self-cleaning ability needs to be improved, which restricts the further application of this invention.

[0008] Therefore, it is of great significance to prepare coatings with self-cleaning properties and radiative cooling functions in a low-cost way for use in temperature regulation, electronic heat dissipation, solar cell cooling and other fields to reduce energy consumption. Summary of the Invention

[0009] In view of the above-mentioned defects of the prior art, in a first aspect of the present invention, a method for preparing a radiant cooling polymer cement coating with low cost and convenient process operation is provided, comprising the following steps:

[0010] (1) In the presence of fluorinated silane or mercaptosilane in the solution environment, the opal glass powder is further refined and modified with fluorinated silane or mercaptosilane, and refined modified opal glass powder A is recovered; similarly, in the presence of polyethylene glycol silane or aminosilane, modified opal glass powder B is obtained accordingly;

[0011] (2) diatomaceous earth is refined in a solution environment, butadiene monomer and initiator are added, and in-situ polymerization occurs in the diatomaceous earth to modify it, thereby obtaining activated diatomaceous earth;

[0012] (3) mixing the activated diatomaceous earth with a vinyl silane monomer, an acrylate monomer, a surfactant, a stabilizer, an initiator, a crosslinking agent and water and reacting the mixture to obtain a modified silicone acrylic emulsion;

[0013] (4) The modified opal glass powder A, the modified opal glass powder B, the modified silicone acrylic emulsion, ordinary Portland cement, quartz powder, a rheological agent, and a binder are mixed to obtain a radiant cooling polymer cement coating.

[0014] Preferably, in parts by weight, in the step (1), 10 to 25 parts of opal glass and 0.5 to 1 part of fluorinated silane or mercaptosilane are used to prepare modified opal glass powder A; 10 to 25 parts of opal glass and 0.5 to 1 part of polyethylene glycol silane or aminosilane are used to prepare modified opal glass powder B; in the step (2), 10 to 20 parts of diatomaceous earth, 1 to 2 parts of butadiene, and 1 to 2 parts of initiator are used to prepare activated diatomaceous earth by in-situ polymerization modification; in the step (3), 10 to 20 parts of activated diatomaceous earth, 20 parts of vinyl silane monomer, 50 parts of acrylate monomer, 1 to 3 parts of surfactant, 3 to 5 parts of stabilizer, 1 to 2 parts of initiator, 1 to 3 parts of crosslinking agent and 100 parts of water are used to prepare a modified silicone acrylic emulsion; in the step (4), 5 to 25 parts of modified opal glass powder A, 5 to 25 parts of modified opal glass powder B, 10 to 20 parts of modified silicone acrylic emulsion, 20 to 40 parts of ordinary Portland cement, 5 to 10 parts of quartz powder, 1 to 3 parts of rheological agent and 1 to 3 parts of binder are used to prepare a radiant cooling polymer cement coating.

[0015] The solution environment in steps (1) and (2) is created by water or an organic solvent, which serves to promote thinning, dispersion, and modification. The solvent is chemically inert relative to the modified raw materials, does not participate in the reaction, and is separated and removed after completion. Those skilled in the art can adaptively add or reduce the amount of solvent according to the actual amount of raw materials used. In addition, thinning can be performed in a suitable manner according to actual operating conditions. For example, under laboratory preparation conditions, this step can be simply completed by grinding, while under industrial amplification conditions, other devices or equipment that can achieve thinning on a large scale are also applicable.

[0016] The opal glass used in the present invention can be commercially available finished products or recycled opal glass. The use of recycled opal glass helps to reuse the raw materials and reduce the production cost.

[0017] Preferably, in step (1), the silica content in the opal glass is 70 wt.% to 90 wt.%, and the fluorine content is 0.05 wt.% to 5 wt.%.

[0018] Preferably, in step (2), the initiator is at least one of benzoyl peroxide and cumene hydroperoxide.

[0019] Preferably, in step (3), the surfactant is at least one of polyvinyl alcohol, Triton, Span, and Tween.

[0020] Preferably, in step (3), the stabilizer is at least one of didecyl phosphite or hydroxypropyl distarch phosphate.

[0021] Preferably, in step (3), the initiator is at least one of dibenzoyl peroxide and methyl ethyl ketone peroxide.

[0022] Preferably, in step (3), the cross-linking agent is at least one of diglycidyl ethyl ether and methyl succinimidyl ester.

[0023] Preferably, in step (3), the reaction time is 0.5 to 1 h.

[0024] Preferably, in step (4), the silica content in the ordinary Portland cement is 20 wt.% to 30 wt.%, and the calcium oxide content is 45 wt.% to 50 wt.%.

[0025] Preferably, in step (4), the rheological agent is at least one of organic bentonite and polyamide wax.

[0026] Preferably, in step (5), the binder is at least one of styrene and epoxy resin.

[0027] In a second aspect of the present invention, a radiative cooling polymer cement coating having superhydrophobic and radiative cooling functions is provided, which is prepared by the method of the first aspect of the present invention.

[0028] In a third aspect of the present invention, there is provided an application of the radiation cooling polymer cement coating according to the second aspect of the present invention, specifically an application as a radiation cooling coating material in reducing heat input.

[0029] Based on the above technical solution, the design concept of the present invention is to modify the opalescent glass powder to obtain a micro-nano patterned cement surface, achieving super-hydrophobicity and radiative cooling. This method can effectively reduce the heat input from sunlight, thereby achieving radiative cooling effects.

[0030] Based on the above technical solutions, the inventive concept of the present invention is as follows:

[0031] First, the present invention provides a preparation method for a radiative cooling polymer cement coating, which adopts a mechanical activation modification method to achieve the purpose of refining glass powder and surface modification in one step, and relies on two different opalescent glass powders to construct a complex hierarchy in the modified emulsion. Opalescent glass powder A has good hydrophobic properties, and opalescent glass powder B has good hydrophilicity. Through the regulation of the two glass powders A and B, a complex and changeable physical and chemical microenvironment area is constructed within the system. When forming a coating, a micro-nano structure can be stably produced, further optimizing the hydrophobic properties of the coating and achieving super-hydrophobicity. However, a single glass powder is difficult to meet and achieve this characteristic. Although unmodified glass powder contains a small amount of fluorine groups, it can only achieve a weaker hydrophobic effect. Furthermore, the use of opalescent glass can also enhance the effect of the coating reflecting sunlight and reduce the heat input of sunlight.

[0032] Only when silicone-acrylic emulsions are modified with diatomaceous earth can they interact effectively with inorganic minerals, creating an organic-inorganic composite structure, enhancing the microstructure of silicone-acrylic coatings and strengthening their physical and chemical properties. However, unmodified diatomaceous earth does not interact well with silicone-acrylic emulsions and instead aggregates, hindering further application of the emulsion and ultimately affecting the cooling performance of the coating. Furthermore, unmodified diatomaceous earth tends to aggregate and accumulate in the coating, disrupting the regularity of the coating's surface structure, increasing heat channels within the coating, and boosting the heat input from sunlight.

[0033] Moreover, through the one-step refinement and modification process in this method, the cost is low, the steps are convenient to operate, the process is greener and more environmentally friendly, and it is conducive to scaled-up production and large-scale application.

[0034] Secondly, the present invention provides a radiative cooling polymer cement coating that is superhydrophobic and has high mid-infrared solar absorptivity. Its excellent self-cleaning ability can effectively reduce solar heat input, achieving the effect of radiative cooling. By designing a formula of two modified opalescent glass powders, combining the surface chemical properties of the powders with the micro-nanostructure of the coating, the coating is endowed with superior superhydrophobic properties, achieving its self-cleaning effect. At the same time, the microstructure can also enhance the reflection and radiation of sunlight, while reducing the heat input of sunlight, optimizing the radiative cooling effect.

[0035] Finally, the present invention provides an application for a radiative cooling polymer cement coating. As a radiative cooling coating material, it is used to reduce heat input and has promising applications in temperature regulation, electronic heat dissipation, and solar cell cooling. This invention is actually an organic-inorganic composite coating. Ultrafine powders optimize the linkages between polymer molecules, enhancing the coating's mechanical properties. It also effectively reduces sunlight input—not just heat, but also ultraviolet and other light. By utilizing the excellent weather resistance of the silicone acrylic emulsion after film formation, the coating provides a stable and long-lasting coating.

[0036] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0037] The present invention provides a method for preparing a radiant cooling polymer cement coating, which has low process cost, convenient steps and is conducive to scaled production and large-scale application.

[0038] The present invention provides a radiative cooling polymer cement coating, which has the characteristics of super hydrophobicity and high mid-infrared solar absorptivity, and has excellent self-cleaning ability, can effectively reduce sunlight heat input, and achieve the effect of radiative cooling.

[0039] The present invention provides an application of a radiative cooling polymer cement coating, which is used as a radiative cooling coating material to reduce heat input and has good application prospects in the fields of temperature regulation, electronic heat dissipation, and solar cell cooling. DETAILED DESCRIPTION

[0040] The present invention is further illustrated by way of examples below, but the present invention is not limited to the scope of the examples. Experimental methods in the following examples where specific conditions are not specified were performed according to conventional methods and conditions, or selected according to the product specifications.

[0041] In the following embodiments:

[0042] Opal glass is a fluorine-containing glass powder that creates an opalescent effect primarily through light scattering by tiny particles of fluoride. The opal glass powder used here is white and has a mesh size of 400. The silica content is 70% to 90% by weight, and the fluorine content is 0.05% to 5% by weight. Diatomaceous earth is a commercially available product with a silica content of 54% by weight and a specific surface area of ​​1.8 m². 2 / g, white powder.

[0043] Example 1

[0044] The preparation method of the radiant cooling polymer cement coating comprises the following steps:

[0045] (1) 15 parts by weight of opal glass powder were dispersed in 100 parts by weight of water, ground in water, 0.7 parts by weight of fluorinated silane were added, grinding was continued, centrifuged and impurities were removed, and refined modified opal glass powder A was obtained; 15 parts by weight of opal glass powder were dispersed in 100 parts by weight of water, ground in water, 0.7 parts by weight of aminosilane were added, grinding was continued, centrifuged and impurities were removed, and refined modified opal glass powder B was obtained;

[0046] (2) adding 10 parts by weight of diatomaceous earth to polyethylene glycol, grinding the mixture, adding 1 part by weight of butadiene and 1 part by weight of dibenzoyl peroxide, and performing in-situ polymerization modification on the diatomaceous earth to obtain activated diatomaceous earth;

[0047] (3) adding 10 parts by weight of activated diatomaceous earth, 20 parts of vinyl silane monomer, 50 parts of acrylate monomer, 1 part by weight of polyvinyl alcohol, 3 parts by weight of didecyl phosphite, 1 part by weight of dibenzoyl peroxide, and 1 part by weight of methyl octanediimidate to 100 parts by weight of water, and reacting for 0.5 hours under mechanical shearing and stirring conditions to obtain a modified silicone acrylic emulsion;

[0048] (4) 5 parts by weight of modified opal glass powder A, 25 parts by weight of modified opal glass powder B, 10 parts by weight of modified silicone acrylic emulsion, 20 parts by weight of ordinary Portland cement, 5 parts by weight of fine quartz powder, 1 part by weight of organic bentonite, and 1 part by weight of epoxy resin were mixed by mechanical stirring for 1 hour and sieved to obtain a radiant cooling polymer cement coating.

[0049] Example 2

[0050] The preparation method of the radiant cooling polymer cement coating comprises the following steps:

[0051] (1) 15 parts by weight of opal glass powder are dispersed in 100 parts by weight of water, ground in water, 0.7 parts by weight of mercaptosilane are added, grinding is continued, centrifugation and impurity removal are performed to obtain refined modified opal glass powder A; 15 parts by weight of opal glass powder are dispersed in 100 parts by weight of water, ground in water, 0.7 parts by weight of polyethylene glycol silane are added, grinding is continued, centrifugation and impurity removal are performed to obtain refined modified opal glass powder B;

[0052] (2) adding 10 parts by weight of diatomaceous earth to polyethylene glycol, grinding the mixture, adding 1 part by weight of butadiene and 1 part by weight of dibenzoyl peroxide, and performing in-situ polymerization modification on the diatomaceous earth to obtain activated diatomaceous earth;

[0053] (3) adding 10 parts by weight of activated diatomaceous earth, 20 parts of vinyl silane monomer, 50 parts of acrylate monomer, 2 parts by weight of polyvinyl alcohol, 4 parts by weight of didecyl phosphite, 1 part by weight of dibenzoyl peroxide, and 2 parts by weight of diglycidyl ethyl ether to 100 parts by weight of water, and reacting for 1 hour under mechanical shearing and stirring conditions to obtain a modified silicone acrylic emulsion;

[0054] (4) 15 parts by weight of modified opal glass powder A, 15 parts by weight of modified opal glass powder B, 10 parts by weight of modified silicone acrylic emulsion, 20 parts by weight of ordinary Portland cement, 5 parts by weight of fine quartz powder, 1 part by weight of organic bentonite, and 1 part by weight of epoxy resin were mixed by mechanical stirring for 1 hour and sieved to obtain a radiant cooling polymer cement coating.

[0055] Example 3

[0056] The preparation method of the radiant cooling polymer cement coating comprises the following steps:

[0057] (1) 20 parts by weight of opal glass powder are dispersed in 100 parts by weight of water, ground in water, 0.8 parts by weight of fluorinated silane are added, grinding is continued, and after centrifugation and impurity removal, refined modified opal glass powder A is obtained; 20 parts by weight of opal glass powder are dispersed in 100 parts by weight of water, ground in water, 0.8 parts by weight of aminosilane are added, grinding is continued, centrifugation and impurity removal are performed, and refined modified opal glass powder B is obtained;

[0058] (2) adding 15 parts by weight of diatomaceous earth to polyethylene glycol, grinding the mixture, adding 2 parts by weight of butadiene and 2 parts by weight of dibenzoyl peroxide, and performing in-situ polymerization modification on the diatomaceous earth to obtain activated diatomaceous earth;

[0059] (3) adding 20 parts by weight of activated diatomaceous earth, an unsaturated bond organosilicon monomer, an acrylic monomer, 1 part by weight of polyvinyl alcohol, 3 parts by weight of didecyl phosphite, 2 parts by weight of dibenzoyl peroxide, and 1 part by weight of methyl octanediimidate to 100 parts by weight of water, and reacting the mixture under mechanical shearing and stirring for 1 hour to obtain a modified silicone acrylic emulsion;

[0060] (4) 20 parts by weight of modified opal glass powder A, 10 parts by weight of modified opal glass powder B, 15 parts by weight of modified silicone acrylic emulsion, 20 parts by weight of ordinary Portland cement, 5 parts by weight of fine quartz powder, 2 parts by weight of organic bentonite, and 2 parts by weight of epoxy resin were mixed by mechanical stirring for 1 hour and sieved to obtain a radiant cooling polymer cement coating.

[0061] Example 4

[0062] The preparation method of the radiant cooling polymer cement coating comprises the following steps:

[0063] (1) 25 parts by weight of opal glass powder are dispersed in 100 parts by weight of water, ground in water, 1 part by weight of mercaptosilane is added, grinding is continued, centrifugation and impurity removal are performed to obtain refined modified opal glass powder A; 25 parts by weight of opal glass powder are dispersed in 100 parts by weight of water, ground in water, 1 part by weight of polyethylene glycol silane is added, grinding is continued, centrifugation and impurity removal are performed to obtain refined modified opal glass powder B;

[0064] (2) adding 20 parts by weight of diatomaceous earth to polyethylene glycol, grinding the mixture, adding 2 parts by weight of butadiene and 2 parts by weight of dibenzoyl peroxide, and performing in-situ polymerization modification on the diatomaceous earth to obtain activated diatomaceous earth;

[0065] (3) adding 20 parts by weight of activated diatomaceous earth, 20 parts of vinyl silane monomer, 50 parts of acrylate monomer, 3 parts by weight of polyvinyl alcohol, 5 parts by weight of didecyl phosphite, 2 parts by weight of dibenzoyl peroxide, and 3 parts by weight of diglycidyl ethyl ether to 100 parts by weight of water, and reacting for 0.5 hours under mechanical shearing and stirring conditions to obtain a modified silicone acrylic emulsion;

[0066] (4) 25 parts by weight of modified opal glass powder A, 5 parts by weight of modified opal glass powder B, 20 parts by weight of modified silicone acrylic emulsion, 40 parts by weight of ordinary Portland cement, 10 parts by weight of fine quartz powder, 3 parts by weight of organic bentonite, and 3 parts by weight of epoxy resin were mixed by mechanical stirring for 1 hour and sieved to obtain a radiant cooling polymer cement coating.

[0067] Comparative Example 1

[0068] The preparation method of the modified polymer cement coating comprises the following steps:

[0069] (1) adding 20 parts by weight of diatomaceous earth to polyethylene glycol, grinding the mixture, adding 2 parts by weight of butadiene and 1 part by weight of dibenzoyl peroxide, and performing in-situ polymerization modification on the diatomaceous earth to obtain activated diatomaceous earth;

[0070] (2) adding 20 parts by weight of activated diatomaceous earth, 20 parts of vinyl silane monomer, 50 parts of acrylate monomer, 3 parts by weight of polyvinyl alcohol, 5 parts by weight of didecyl phosphite, 1 part by weight of dibenzoyl peroxide, and 3 parts by weight of diglycidyl ethyl ether to 100 parts by weight of water, and reacting for 1 hour under mechanical shearing and stirring conditions to obtain a modified silicone acrylic emulsion;

[0071] (3) 20 parts by weight of modified silicone acrylic emulsion, 40 parts by weight of ordinary Portland cement, 10 parts by weight of fine quartz powder, 3 parts by weight of organic bentonite, and 3 parts by weight of epoxy resin were mixed by mechanical stirring for 1 hour and sieved to obtain a modified polymer cement coating.

[0072] Comparative Example 2

[0073] The preparation method of opalescent glass powder modified polymer cement coating comprises the following steps:

[0074] (1) 25 parts by weight of opal glass powder are dispersed in 100 parts by weight of water, ground in water, 1 part by weight of fluorinated silane (or mercaptosilane, etc.) is added, grinding is continued, centrifugation and impurity removal are performed to obtain refined modified opal glass powder A; 25 parts by weight of opal glass powder are dispersed in 100 parts by weight of water, ground in water, 1 part by weight of polyethylene glycol silane (or aminosilane, etc.) is added, grinding is continued, centrifugation and impurity removal are performed to obtain refined modified opal glass powder B;

[0075] (2) 22 parts by weight of modified opal glass powder A, 22 parts by weight of modified opal glass powder B, 40 parts by weight of ordinary Portland cement, 10 parts by weight of fine quartz powder, 3 parts by weight of organic bentonite, and 3 parts by weight of epoxy resin were mixed by mechanical stirring for 1 hour and sieved to obtain an opal glass powder-modified polymer cement coating.

[0076] Comparative Example 3

[0077] Compared with Example 4, the radiant cooling polymer cement coating does not contain modified opalescent glass powder B, specifically as follows:

[0078] The preparation method of the radiant cooling polymer cement coating comprises the following steps:

[0079] (1) 25 parts by weight of opal glass powder were dispersed in 100 parts by weight of water, and the mixture was ground in water. 1 part by weight of mercaptosilane was added, and the grinding was continued. After centrifugation and impurity removal, a refined modified opal glass powder A was obtained;

[0080] (2) adding 20 parts by weight of diatomaceous earth to polyethylene glycol, grinding the mixture, adding 2 parts by weight of butadiene and 2 parts by weight of dibenzoyl peroxide, and performing in-situ polymerization modification on the diatomaceous earth to obtain activated diatomaceous earth;

[0081] (3) adding 20 parts by weight of activated diatomaceous earth, 20 parts of vinyl silane monomer, 50 parts of acrylate monomer, 3 parts by weight of polyvinyl alcohol, 5 parts by weight of didecyl phosphite, 2 parts by weight of dibenzoyl peroxide, and 3 parts by weight of diglycidyl ethyl ether to 100 parts by weight of water, and reacting for 0.5 hours under mechanical shearing and stirring conditions to obtain a modified silicone acrylic emulsion;

[0082] (4) 25 parts by weight of modified opalescent glass powder A, 20 parts by weight of modified silicone acrylic emulsion, 40 parts by weight of ordinary Portland cement, 10 parts by weight of fine quartz powder, 3 parts by weight of organic bentonite, and 3 parts by weight of epoxy resin were mixed by mechanical stirring for 1 hour and sieved to obtain a radiant cooling polymer cement coating.

[0083] Comparative Example 4

[0084] Compared with Example 4, the radiant cooling polymer cement coating does not contain modified opalescent glass powder A, specifically as follows:

[0085] The preparation method of the radiant cooling polymer cement coating comprises the following steps:

[0086] (1) 25 parts by weight of opal glass powder were dispersed in 100 parts by weight of water, and the mixture was ground in water. 1 part by weight of polyethylene glycol silane was added, and the grinding was continued. After centrifugation and impurity removal, a refined modified opal glass powder B was obtained;

[0087] (2) adding 20 parts by weight of diatomaceous earth to polyethylene glycol, grinding the mixture, adding 2 parts by weight of butadiene and 2 parts by weight of dibenzoyl peroxide, and performing in-situ polymerization modification on the diatomaceous earth to obtain activated diatomaceous earth;

[0088] (3) adding 20 parts by weight of activated diatomaceous earth, 20 parts of vinyl silane monomer, 50 parts of acrylate monomer, 3 parts by weight of polyvinyl alcohol, 5 parts by weight of didecyl phosphite, 2 parts by weight of dibenzoyl peroxide, and 3 parts by weight of diglycidyl ethyl ether to 100 parts by weight of water, and reacting for 0.5 hours under mechanical shearing and stirring conditions to obtain a modified silicone acrylic emulsion;

[0089] (4) 5 parts by weight of modified opalescent glass powder B, 20 parts by weight of modified silicone acrylic emulsion, 40 parts by weight of ordinary Portland cement, 10 parts by weight of fine quartz powder, 3 parts by weight of organic bentonite, and 3 parts by weight of epoxy resin were mixed by mechanical stirring for 1 hour and sieved to obtain a radiant cooling polymer cement coating.

[0090] Comparative Example 5

[0091] Compared with Example 4, the modified silicone acrylic emulsion does not contain modified diatomaceous earth, specifically as follows:

[0092] The preparation method of the radiant cooling polymer cement coating comprises the following steps:

[0093] (1) 25 parts by weight of opal glass powder are dispersed in 100 parts by weight of water, ground in water, 1 part by weight of mercaptosilane is added, grinding is continued, centrifugation and impurity removal are performed to obtain refined modified opal glass powder A; 25 parts by weight of opal glass powder are dispersed in 100 parts by weight of water, ground in water, 1 part by weight of polyethylene glycol silane is added, grinding is continued, centrifugation and impurity removal are performed to obtain refined modified opal glass powder B;

[0094] (2) adding 20 parts by weight of diatomaceous earth, 20 parts by weight of vinyl silane monomer, 50 parts by weight of acrylate monomer, 3 parts by weight of polyvinyl alcohol, 5 parts by weight of didecyl phosphite, 2 parts by weight of dibenzoyl peroxide, and 3 parts by weight of diglycidyl ethyl ether to 100 parts by weight of water, and reacting for 0.5 hours under mechanical shearing and stirring conditions to obtain a modified silicone acrylic emulsion;

[0095] (4) 25 parts by weight of modified opal glass powder A, 5 parts by weight of modified opal glass powder B, 20 parts by weight of modified silicone acrylic emulsion, 40 parts by weight of ordinary Portland cement, 10 parts by weight of fine quartz powder, 3 parts by weight of organic bentonite, and 3 parts by weight of epoxy resin were mixed by mechanical stirring for 1 hour and sieved to obtain a radiant cooling polymer cement coating.

[0096] Performance tests were conducted on the radiative cooling polymer cement coatings of the examples and the comparative examples. These tests included mid-infrared solar absorptivity, ambient temperature difference, and water contact angle. These tests were measured using a Fourier transform infrared spectrometer, an infrared thermal imager, and a contact angle meter. The corresponding test results are shown in Table 1.

[0097] Table 1:

[0098]

[0099] The above test data show that compared with Examples 1, 2, 3 and 4, the mid-infrared solar absorptivity and water contact angle are significantly improved, and the temperature is significantly lower than that of the surrounding environment. Among them, Example 4 is the best. This is because during the coating implementation process, it is easy to obtain a micro-nano patterned cement surface, achieve superhydrophobicity and radiative cooling, which contributes to low-cost and high-efficiency modification, expands the radiation range of the material, and optimizes the radiative cooling effect of the coating.

[0100] Compared with Example 4, the effect of Comparative Example 1 is poor because the opalescent glass powders A and B are not added, the main infrared radiation filler is missing, and the surface property of Comparative Example 1 is not super-hydrophobic.

[0101] Compared with Example 4, the effect of Example 2 is relatively poor. The reason is that the inorganic coating of the unmodified silicone acrylic emulsion relies on cement hydration and gelation, and its surface structure is relatively rough, and the radiation effect is unstable.

[0102] Compared with Example 4, the effect of Comparative Example 3 is poor because the milky white glass powder B is not added, which will weaken the micro-nano surface structure effect after the coating is applied, thereby reducing the radiative cooling effect.

[0103] Compared with Example 4, the effect of Example 4 is poor because the opalescent glass powder A is not added, which will weaken the hydrophobic properties of the coating, reduce the micro-nano surface structure effect, and reduce the radiant cooling effect.

[0104] Compared with Example 4, the effect of Example 5 is poor. The reason is that the unmodified diatomaceous earth reduces the relationship between the fillers in the emulsion, destroys the micro-nano surface structure, reduces the hydrophobic effect, and also greatly radiates the cooling effect and heat insulation effect.

[0105] Comparison of the data shows that the opalescent glass powders A and B and the modified silicone acrylic emulsion play an important role in the present invention, and their combined effect is an indispensable design scheme of the present invention.

[0106] The above describes in detail the preferred embodiments of the present invention. It should be understood that those skilled in the art can make numerous modifications and variations based on the concepts of the present invention without inventive effort. Therefore, any technical solutions that can be derived by those skilled in the art through logical analysis, reasoning, or limited experimentation based on the concepts of the present invention and the prior art should be within the scope of protection defined by the claims.

Claims

1. A method for preparing a radiant cooling polymer cement coating, characterized in that: The steps include: (1) When fluorinated silane or mercaptosilane exists in the solution environment, the opal glass powder is further refined in this environment and modified with fluorinated silane or mercaptosilane, and the refined modified opal glass powder A is recovered; similarly, when polyethylene glycol silane or aminosilane exists, the modified opal glass powder B is obtained accordingly; (2) The diatomaceous earth is refined in a solution environment, butadiene monomer and initiator are added, and in-situ polymerization occurs in the diatomaceous earth to modify it, thereby obtaining activated diatomaceous earth; (3) mixing the activated diatomaceous earth with a vinyl silane monomer, an acrylate monomer, a surfactant, a stabilizer, an initiator, a crosslinking agent and water and reacting the mixture to obtain a modified silicone acrylic emulsion; (4) The modified opal glass powder A, modified opal glass powder B, modified silicone acrylic emulsion, ordinary Portland cement, quartz powder, rheological agent, and binder are mixed to obtain a radiant cooling polymer cement coating.

2. The method according to claim 1, wherein: In parts by weight, in the step (1), 10 to 25 parts of opal glass powder and 0.5 to 1 part of fluorinated silane or mercaptosilane are used to prepare modified opal glass powder A; 10 to 25 parts of opal glass powder and 0.5 to 1 part of polyethylene glycol silane or aminosilane are used to prepare modified opal glass powder B; in the step (2), 10 to 20 parts of diatomaceous earth, 1 to 2 parts of butadiene, and 1 to 2 parts of initiator are used to prepare activated diatomaceous earth by in-situ polymerization modification; in the step (3), 10 to 20 parts of activated diatomaceous earth, 2 0 parts of vinyl silane monomer, 50 parts of acrylate monomer, 1~3 parts of surfactant, 3~5 parts of stabilizer, 1~2 parts of initiator, 1~3 parts of cross-linking agent and 100 parts of water are used to prepare a modified silicone acrylic emulsion; in the step (4), 5~25 parts of modified opal glass powder A, 5~25 parts of modified opal glass powder B, 10~20 parts of modified silicone acrylic emulsion, 20~40 parts of ordinary Portland cement, 5~10 parts of quartz powder, 1~3 parts of rheological agent and 1~3 parts of binder are used to prepare a radiant cooling polymer cement coating.

3. The method according to claim 1, wherein: In the step (1), the silica content in the opalescent glass powder is 70wt.-90wt.%, and the fluorine content is 0.05wt.%-5wt.%.

4. The method according to claim 1, wherein: In the step (2), the initiator is at least one of benzoyl peroxide and cumene hydroperoxide.

5. The method according to claim 1, wherein: In the step (3), the surfactant is at least one of polyvinyl alcohol, Span, and Tween; the stabilizer is at least one of didecyl phosphite or hydroxypropyl distarch phosphate; the initiator is at least one of dibenzoyl peroxide and methyl ethyl ketone peroxide; and the cross-linking agent is at least one of diglycidyl ethyl ether and methyl diimidate.

6. The method according to claim 1, wherein: In the step (3), the reaction time is 0.5 to 1 h.

7. The method according to claim 1, wherein: In the step (4), the silica content in the ordinary Portland cement is 20wt.%~30wt.%, and the calcium oxide content is 45wt.%~50wt.%; the rheological agent is at least one of organic bentonite and polyamide wax.

8. The method according to claim 1, wherein: In the step (4), the adhesive is epoxy resin.

9. A radiant cooling polymer cement coating, characterized in that: The method is prepared by the method according to any one of claims 1 to 8.

10. An application of the radiant cooling polymer cement coating according to claim 9, characterized in that: Application as a radiative cooling coating material to reduce heat input.

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