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CN-121975439-A - High-reflection heat-insulating coating for energy-saving roof of house building and construction process thereof

CN121975439ACN 121975439 ACN121975439 ACN 121975439ACN-121975439-A

Abstract

The invention relates to a high-reflection heat-insulating coating for a house building energy-saving roof and a construction process thereof, wherein the high-reflection heat-insulating coating comprises a high-reflection heat-insulating main coating formed by solidification, the high-reflection heat-insulating main coating is prepared from raw materials in parts by mass, colloidal silica subjected to surface modification by organosilane is distributed at the contact interface of borosilicate hollow glass beads and hydrophobic silica aerogel powder and is used for forming an interface bridging unit, and the median particle diameter of the borosilicate hollow glass beads is set to be The median particle diameter of the hydrophobic silica aerogel powder is The average particle diameter of the organosilane surface-modified colloidal silica is The mass ratio of the borosilicate hollow glass beads to the hydrophobic silica aerogel powder to the organosilane surface modified colloidal silica is 1 (0.50-0.75) (0.20-0.32). The invention improves the interfacial compatibility and dispersion stability of aerogel particles and hollow glass beads in a film forming system, and improves the distribution stability of functional fillers in a coating.

Inventors

  • ZHANG YONG
  • XU SHAOQIANG

Assignees

  • 山东德兴集团建设工程有限公司

Dates

Publication Date
20260505
Application Date
20260320

Claims (10)

  1. 1. A high-reflection heat-insulating coating for energy-saving roof of house building is characterized in that, The high-reflection heat-insulation main coating is prepared from the following raw materials, by mass, 32-38 parts of a water-based film-forming base material, 14-19 parts of rutile type titanium dioxide, 1.2-2.4 parts of nano titanium dioxide, 8-11 parts of borosilicate hollow glass beads sequentially treated by amino silane and epoxy silane, 4.5-7.0 parts of hydrophobic silica aerogel powder, 1.8-3.2 parts of colloidal silica surface modified by organosilane, 0.2-0.6 part of a dispersing agent, 0.1-0.3 part of a wetting agent, 0.1-0.3 part of a defoaming agent, 0.2-0.7 part of a thickening agent, 0.5-1.1 part of a film-forming auxiliary agent and 18-26 parts of water; The organic silane surface modified colloidal silica is distributed at the contact interface of the borosilicate hollow glass beads and the hydrophobic silica aerogel powder and is used for forming an interface bridging unit; the median particle diameter of the borosilicate hollow glass beads is set as The median particle diameter of the hydrophobic silica aerogel powder is The average particle diameter of the organosilane surface-modified colloidal silica is Then the following is satisfied: The mass ratio of the borosilicate hollow glass beads to the hydrophobic silica aerogel powder to the organosilane surface modified colloidal silica is 1 (0.50-0.75) (0.20-0.32).
  2. 2. The energy saving roof highly reflective thermal insulating coating for building construction according to claim 1, wherein, The borosilicate hollow glass bead comprises a glass substrate, and is characterized in that a double-layer silane treatment layer is arranged on the outer surface of the borosilicate hollow glass bead, the double-layer silane treatment layer comprises an aminosilane inner layer which is directly contacted with the glass substrate and an epoxy silane outer layer which is arranged on the outer side of the aminosilane inner layer, and the mass ratio of the aminosilane inner layer to the epoxy silane outer layer is 1 (0.7-1.3).
  3. 3. The energy saving roof highly reflective thermal insulating coating for building construction according to claim 1, wherein, The surface of the hydrophobic silica aerogel powder contains trimethylsilyl, the median particle diameter of the hydrophobic silica aerogel powder is 4-8 mu m, the pore volume is 2.5-5.5 cm < 3 >/g, and the specific surface area is 450-750 m < 2 >/g.
  4. 4. The energy saving roof highly reflective thermal insulating coating for building construction according to claim 1, wherein, The organic silane surface modified colloidal silica is formed by jointly modifying methyl trimethoxy silane and glycidyl ether oxypropyl trimethoxy silane, the mass ratio of the methyl trimethoxy silane to the glycidyl ether oxypropyl trimethoxy silane is 1 (0.4-1.2), the solid content of the organic silane surface modified colloidal silica is 22% -28%, and the average particle size is 10-18 nm.
  5. 5. The energy saving roof highly reflective thermal insulating coating for building construction according to claim 1, wherein, The mass ratio of the rutile type titanium dioxide to the nano titanium dioxide is 7:1-10:1, the median particle size of the rutile type titanium dioxide is 0.20-0.30 mu m, and the average particle size of the nano titanium dioxide is 15-30 nm.
  6. 6. The energy saving roof highly reflective thermal insulating coating for building construction according to claim 1, wherein, Taking the total number of borosilicate hollow glass bead particles in a 500-time image of a scanning electron microscope as a statistical object on a curing section of the high-reflection heat-insulation main coating, respectively counting in three different fields of view, and then taking an average value, wherein the proportion of the unbroken borosilicate hollow glass beads is not less than 88%; the median particle diameter of the hydrophobic silica aerogel powder aggregate is not more than 18 mu m according to the area equivalent diameter.
  7. 7. The energy saving roof highly reflective thermal insulating coating for building construction according to claim 1, wherein, A sealing bottom coating is arranged between the roof base layer and the high-reflection heat-insulation main coating, and a weather-proof finish coating is arranged on the surface of the high-reflection heat-insulation main coating; the sealing primer coating is prepared from the following raw materials, by mass, 8-15 parts of an aqueous film-forming base material, 10-15 parts of lithium-based silicate, 0.6-1.2 parts of aminosilane, 0.1-0.3 part of a wetting agent and 70-80 parts of water; The weather-resistant finish coat is prepared from the following raw materials, by mass, 25-34 parts of a water-based finish coat base material, 2-5 parts of nano silicon dioxide, 0.2-0.8 part of a polysiloxane modifier, 0.1-0.3 part of a leveling agent, 0.4-1.0 part of a film forming auxiliary agent and 58-68 parts of water; The aminosilane in the sealing primer layer and the aminosilane used for the surface treatment of the borosilicate hollow glass microsphere are the same aminosilane.
  8. 8. A construction process of the house construction energy-saving roof high-reflection heat-insulating coating according to any one of claims 1 to 7, which is characterized by comprising the following steps: S1, adding aminosilane into an alcohol-water mixed solution to perform first prehydrolysis to obtain a first silane prehydrolysis solution; S2, adding the borosilicate hollow glass beads into the first silane pre-hydrolysis liquid for treatment, drying, adding epoxy silane into the alcohol-water mixed liquid for second pre-hydrolysis, and carrying out second treatment on the borosilicate hollow glass beads subjected to the first pre-hydrolysis treatment to obtain the borosilicate hollow glass beads subjected to the sequential treatment of the amino silane and the epoxy silane; S3, mixing the colloidal silica subjected to organosilane surface modification, part of the aqueous film-forming base material, the dispersing agent and part of the water to prepare bridged precursor dispersion; s4, adding the borosilicate hollow glass beads sequentially treated by the aminosilane and the epoxy silane and the hydrophobic silica aerogel powder into the bridged precursor dispersion liquid, stirring for 10-18 min at 200-350 r/min, and standing for 8-15 min to obtain interface assembly slurry; S5, adding rutile type titanium dioxide, nano titanium dioxide, the rest of the aqueous film-forming base material, the wetting agent, the defoaming agent, the thickening agent, the film-forming auxiliary agent and the rest of the water into the interface assembly slurry, and stirring for 10-20 min at 250-500 r/min to obtain a main coating; s6, the main coating is subjected to two-way cross construction on the surface of the roof base layer to form the high-reflection heat-insulation main coating.
  9. 9. The construction process according to claim 8, wherein, The mass ratio of the alcohol to the water in the alcohol-water mixed solution in the step S1 and the step S2 is 70:30-80:20, the pH values of the first pre-hydrolysis and the second pre-hydrolysis are 4.8-5.2, the addition amount of the aminosilane is 0.4-0.9 part by mass and the addition amount of the epoxy silane is 0.3-0.8 part by mass based on 100 parts by mass of the borosilicate hollow glass beads.
  10. 10. The construction process according to claim 8, wherein, In the step S3, the mass ratio of the organic silane surface modified colloidal silica to part of the aqueous film forming base material to part of the water is 1 (5-8): 3-5.

Description

High-reflection heat-insulating coating for energy-saving roof of house building and construction process thereof Technical Field The invention relates to the technical field of building energy-saving coatings, in particular to a high-reflection heat-insulating coating for a house building energy-saving roof and a construction process thereof. Background The roof is used as an important part for directly receiving solar radiation in the building enclosure structure, and the sunlight reflection performance and the heat insulation performance of the surface coating can directly influence the energy-saving effect of the building. In the prior art, functional components such as silica aerogel, hollow microbeads or reflective pigments are generally introduced into a film forming system to reduce heat transfer and improve the heat insulation performance of a roof. In the prior art, for example, publication number CN107858050A discloses a SiO2 aerogel heat insulation coating, which comprises matrix paint, siO2 aerogel, hollow glass beads with titanium dioxide coating, dimethyl hydroxyl silicone oil, cetyl trimethyl ammonium bromide, a curing agent and an auxiliary agent in parts by weight, wherein the auxiliary agent comprises a dispersing agent, a wetting agent, a defoaming agent and a leveling agent. The application also discloses a corresponding preparation method, namely, firstly performing dispersion treatment on SiO2 aerogel, then performing treatment on hollow glass microspheres with titanium dioxide coating, then mixing and standing the hollow glass microspheres and further compounding the hollow glass microspheres with matrix paint, a curing agent and an auxiliary agent, thereby obtaining the heat-insulating coating. According to the scheme, the synergistic effect of SiO2 aerogel and hollow glass beads with titanium dioxide coatings is utilized, so that the heat insulation performance of the coating is improved. However, the focus of the prior art described above is mainly on the incorporation of silica aerogel and hollow glass microspheres as functional fillers into film forming systems to exert the respective thermal insulation effects. The prior art is not further designed specifically for interfacial compatibility, dispersion stability and distribution state of functional filler after film formation of silica aerogel particles and hollow glass beads in a film forming system. Particularly in the high-reflection heat-insulating coating of the roof, when the relatively stable interface bonding relation between aerogel particles and hollow glass beads is lacked, the conditions of uneven particle dispersion, partial agglomeration or unstable spatial distribution after film formation are easy to occur, thereby influencing the function of the functional filler in the coating. Although the prior art discloses a stepwise processing and compounding concept, the disclosure of the prior art still mainly stays on the aspects of component compounding and conventional dispersion. Therefore, aiming at the closest prior art, the application mainly solves the technical problem of how to improve the interfacial compatibility and the dispersion stability of aerogel particles and hollow glass beads in a film forming system in the high-reflection heat-insulating coating of the energy-saving roof of a building, so as to improve the distribution stability of functional fillers in the coating. Disclosure of Invention Aiming at the problems of insufficient interfacial compatibility, poor dispersion stability and poor distribution stability of functional fillers in a coating of the aerogel particles and the hollow glass beads in the film forming system in the prior art, the invention aims to provide a high-reflection heat-insulating coating for a house building energy-saving roof and a construction process thereof, the coating adopts borosilicate hollow glass beads sequentially treated by amino silane and epoxy silane, hydrophobic silica aerogel powder and organic silane surface modified colloidal silica distributed at the contact interface of the borosilicate hollow glass beads and the hydrophobic silica aerogel powder, and limits the grain size grading relationship and mass ratio relationship of the borosilicate hollow glass beads, so that the interfacial compatibility and the dispersion stability of aerogel particles and the hollow glass beads in a film forming system are improved, and the distribution stability of functional fillers in the coating is improved. The invention discloses a high-reflection heat-insulating coating for an energy-saving roof of a building, which comprises a high-reflection heat-insulating main coating formed by curing, wherein the high-reflection heat-insulating main coating is prepared from, by mass, 32-38 parts of a water-based film-forming base material, 14-19 parts of rutile type titanium dioxide, 1.2-2.4 parts of nano titanium dioxide, 8-11 parts of borosilicate hollow glass beads sequentially