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CN-116835919-B - Heat-insulating concrete and preparation method thereof

CN116835919BCN 116835919 BCN116835919 BCN 116835919BCN-116835919-B

Abstract

The application discloses a heat-insulating concrete and a preparation method thereof, wherein the heat-insulating concrete comprises, by weight, 150-200 parts of cement, 200-250 parts of coarse aggregate, 300-420 parts of fine aggregate, 120-200 parts of lightweight aggregate and 50-90 parts of water, wherein the lightweight aggregate is prepared from modified polyurethane microbeads, and the modified polyurethane microbeads are prepared from a metal organic framework grown on the surfaces of the polyurethane microbeads. The building prepared by the concrete can keep good heat insulation performance and mechanical property for a long time, and the indoor environment is warm in winter and cool in summer, so that the building is suitable for offices and living.

Inventors

  • WANG HONGLAI
  • Lu Xiaqiong
  • ZHOU YUNJIAN

Assignees

  • 杭州汉特建材有限公司

Dates

Publication Date
20260512
Application Date
20230626

Claims (6)

  1. 1. The heat-insulating concrete is characterized by comprising, by weight, 150-200 parts of cement, 200-250 parts of coarse aggregate, 300-420 parts of fine aggregate, 120-200 parts of lightweight aggregate and 50-90 parts of water, wherein the lightweight aggregate is prepared from modified polyurethane microbeads, and the modified polyurethane microbeads are prepared from a metal organic framework grown on the surfaces of the polyurethane microbeads; The modified polyurethane microbeads comprise, by weight, 52-65 parts of polyurethane microbeads, 21-38 parts of magnesium nitrate, 8-20 parts of trimesic acid and tetrabutyl titanate, wherein the weight ratio of the tetrabutyl titanate to the magnesium nitrate is (40-46) (21-38); The polyurethane microbead comprises, by weight, 20-45 parts of polyether polyol, 10-15 parts of isocyanate, 3-5 parts of a cross-linking agent, 0.4-1.6 parts of an emulsifying agent, 0.4-2.6 parts of a surfactant, 0.08-0.12 part of a stabilizer and itaconic acid, wherein the weight ratio of itaconic acid to isocyanate is (1-4) (10-15).
  2. 2. The heat-insulating concrete according to claim 1, wherein the surfactant is any one of sodium dodecyl benzene sulfonate and sodium dodecyl sulfate.
  3. 3. The heat-insulating concrete according to claim 1, wherein the preparation method of the polyurethane microbeads comprises the following steps: preparing a prepolymer, namely mixing polyether polyol, isocyanate, itaconic acid and a cross-linking agent for reaction to obtain the prepolymer; Emulsifying, namely adding a surfactant and an emulsifying agent into the prepolymer, and adding water and stirring to obtain emulsion; and (3) preparing the microbeads, namely adding a stabilizer into the emulsion, reacting, and forming to obtain the polyurethane microbeads.
  4. 4. The heat-insulating concrete according to claim 1, wherein the lightweight aggregate is prepared by the steps of: And (3) growing a metal organic framework, namely dissolving tetrabutyl titanate and magnesium nitrate in methanol to obtain a mixed solution, adding polyurethane microbeads and trimesic acid into the methanol, and carrying out hydrothermal reaction to obtain the modified polyurethane microbeads.
  5. 5. The heat-insulating concrete according to claim 4, wherein the lightweight aggregate is prepared by the steps of: Surface modification, namely taking polyurethane microbeads to carry out plasma treatment to obtain the polyurethane microbeads with the surface modified; And (3) growing a metal organic framework, namely dissolving tetrabutyl titanate and magnesium nitrate in methanol to obtain a mixed solution, adding the surface modified polyurethane microbeads and trimesic acid into the mixed solution, and carrying out hydrothermal reaction to obtain the modified polyurethane microbeads.
  6. 6. The method for preparing the heat-insulating concrete according to any one of claims 1 to 5, comprising the following steps: preparing cement slurry, namely mixing water with cement to obtain cement slurry; cement mortar is prepared by adding coarse aggregate and fine aggregate into cement slurry material and mixing to obtain cement mortar; and (3) preparing the heat-insulating concrete, namely adding lightweight aggregate into cement mortar and mixing to obtain the heat-insulating concrete.

Description

Heat-insulating concrete and preparation method thereof Technical Field The application relates to the field of concrete, in particular to heat-insulating concrete and a preparation method thereof. Background The concrete is a common material in construction, and has the advantages of high strength, good flame retardance, low raw material cost and the like. However, the heat conductivity coefficient of the concrete is high, and the structural density is high, so that the heat insulation performance and the heat insulation performance of the building built by the concrete are poor. At present, the heat insulation effect of a concrete building is improved by mainly coating a heat insulation coating on the surface of the concrete, but the heat insulation materials commonly used in the market at present, such as polyurethane, release formaldehyde in the use process, influence the health of a human body, and the polyurethane is easily aged and deformed by environmental influence, so that the heat insulation performance of the concrete is reduced. Disclosure of Invention The application provides heat insulation concrete and a preparation method thereof in order to solve the problem that concrete does not have long-term heat insulation performance. The heat-insulating concrete comprises 150-200 parts of cement, 200-250 parts of coarse aggregate, 300-420 parts of fine aggregate, 120-200 parts of lightweight aggregate and 50-90 parts of water, wherein the lightweight aggregate is prepared by grafting modified polyurethane microbeads with a metal organic framework by using the polyurethane microbeads. Typically, but not by way of limitation, crushed stone is used for coarse aggregate and river sand is used for fine aggregate. By adopting the technical scheme, the aggregate comprises part of lightweight aggregate, so that the porosity of the concrete can be increased, the density and the heat conductivity coefficient of the concrete are reduced, and the cold-hot bridge effect is further reduced, thereby improving the heat preservation and heat insulation performance of the concrete. The micro-beads are used as light materials, have lower heat conductivity coefficient, can improve the whole heat conductivity coefficient of the concrete, can reduce the density of the concrete, thereby improving the heat insulation performance of the concrete, and can reduce the whole weight of the concrete by being used as light aggregate, reduce the dead weight of the building, thereby reducing the structural load, improving the earthquake resistance performance, reducing the generation of building cracks and prolonging the service life of the building. The lightweight aggregate is preferably modified polyurethane microbeads, polyurethane has lower heat conduction performance, the polyurethane microbeads have better stability, are not easy to react with other raw materials and decompose or dissolve in concrete, so that the concrete building has long-term heat insulation performance, and in addition, the polyurethane microbeads have high strength, and can improve the mechanical performance of the concrete when the mechanical performance is reduced due to the increase of the porosity of the building. The polyurethane microbeads are obtained by modifying a metal organic framework, and after the metal organic framework is doped in the concrete, the metal organic framework has a porous crystal structure, so that the porosity of the concrete can be adjusted, the pore size distribution of the concrete is controlled, the heat insulation effect of the concrete building is further improved, in addition, the metal organic framework has a certain mechanical strength and a certain pore structure, the microstructure of the concrete can be improved, and the metal organic framework can be used as a catalyst to promote hydration reaction in the metal ion dissociation process, so that the mechanical property of the concrete is improved. After the polyurethane is modified by adopting the metal organic frame, the metal organic frame has a porous structure, a larger specific surface area and a better adsorption capacity, so that the aggregation of polyurethane microbeads can be improved, the dispersion performance of the polyurethane microbeads in a concrete building can be improved, the heat preservation and insulation performance of the concrete building can be further improved, a surface protection film can be formed on the surface of the polyurethane microbeads, the ageing decomposition of the polyurethane microbeads can be reduced, the long-term heat preservation and insulation performance of the concrete building can be improved, and the metal organic frame can also improve the mechanical performance of the polyurethane, so that the mechanical performance of the concrete building can be improved. Preferably, the polyurethane microbeads comprise the following components, by weight, 20-45 parts of polyether polyol and 10-15 parts of polyether polyol Is