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CN-121989529-A - Heat insulation material, preparation method thereof and household appliance

CN121989529ACN 121989529 ACN121989529 ACN 121989529ACN-121989529-A

Abstract

The invention provides a heat insulation material, a preparation method thereof and a household appliance, and relates to the technical field of heat insulation materials, wherein the heat insulation material comprises a main body and an organic core material, the main body is provided with an inner cavity, and the organic core material is filled in the inner cavity of the main body; the organic core material comprises fumed silica composite organic fibers. According to the technical scheme, the organic core material prepared by compounding the fumed silica and the organic fiber is used as an organic core material to prepare the heat insulation material, so that the glass fiber is not used, and meanwhile, the organic core material prepared by compounding the fumed silica and the organic fiber is internally provided with a porous structure, so that the heat insulation effect of the organic core material can be further improved, the heat conductivity coefficient of the heat insulation material is further reduced, and the heat insulation performance of the heat insulation material is enhanced.

Inventors

  • JU JIANZHU
  • LI CHANGXI
  • ZHAO JINGYUN

Assignees

  • 合肥华凌股份有限公司
  • 合肥美的电冰箱有限公司
  • 美的集团股份有限公司

Dates

Publication Date
20260508
Application Date
20241101

Claims (20)

  1. 1. The heat insulation material is characterized by comprising a main body and an organic core material, wherein the main body is provided with an inner cavity, and the organic core material is filled in the inner cavity of the main body; the organic core material comprises fumed silica composite organic fibers.
  2. 2. The insulation material of claim 1, wherein the fumed silica composite organic fiber comprises fumed silica and an organic fiber: In the fumed silica composite organic fiber, the mass ratio of the fumed silica is 6% -10%, and/or, The fumed silica has a porosity of not less than 85%, and/or, The organic fiber comprises at least one of polypropylene, polyethylene, polyester, polyamide, polyacrylonitrile and polyvinyl alcohol.
  3. 3. The heat insulating material according to claim 2, wherein the fumed silica has a pore size of 100 to 1000nm and/or, The length of the aerosil composite organic fiber is L, L is more than or equal to 1mm and less than or equal to 250mm, and/or, The diameter of the aerosil composite organic fiber is D, and D is more than or equal to 0.5 mu m and less than or equal to 50 mu m.
  4. 4. The insulation material of claim 3, wherein the fumed silica composite organic fiber has a length L,25 mm≤L≤250 mm.
  5. 5. The heat insulating material according to claim 3, wherein the fumed silica has a pore size of 200 to 300nm and/or, The length of the aerosil composite organic fiber is L, L is more than or equal to 1mm and less than or equal to 12mm, and/or, The diameter of the aerosil composite organic fiber is D, and D is more than or equal to 3 mu m and less than or equal to 15 mu m.
  6. 6. The insulating material of claim 1, further comprising a desiccant and a getter disposed within the interior cavity of the body.
  7. 7. The insulation material of claim 1, wherein the insulation material has a thermal conductivity of less than 1.3mW (m K) -1 .
  8. 8. The insulation material of claim 1, wherein the interior cavity is sealed and provided in a vacuum, and/or, The body is plate-shaped, and/or, The material of the body comprises a plastic or a metallized material.
  9. 9. The insulation material of claim 1, wherein the cavity is sealed and is vacuum-set, and wherein the cavity has a vacuum of 1 x 10 -3 ～8×10 -3 Pa.
  10. 10. The preparation method of the heat insulation material is characterized by comprising the following steps of: S10, mixing fumed silica composite organic fibers with the dispersion liquid to obtain an organic fiber suspension; S20, preparing the organic fiber suspension into a fiber web, and drying to obtain fiber cloth; S30, stacking the fiber cloth and then performing heat treatment to obtain an organic core material; S40, arranging the organic core material in the inner cavity of the main body to obtain the heat insulation material.
  11. 11. The method according to claim 10, wherein in step S10, the mass concentration of the fumed silica composite organic fiber in the organic fiber suspension is 0.005% -1.0%.
  12. 12. The method according to claim 11, wherein in step S10, the mass concentration of the fumed silica composite organic fiber in the organic fiber suspension is 0.01% -0.1%.
  13. 13. The method of producing insulation according to claim 10, wherein in step S20, the organic fiber suspension is formed into a fiber web using a wet-laid process.
  14. 14. The method of claim 13, wherein in step S20, the wet-laid process is performed at a baking temperature of 100 to 240 ℃ and/or, The baking time of the wet-laid process is 30-120 min.
  15. 15. The method of claim 14, wherein in step S20, the wet-laid process is performed at 140-200 ℃.
  16. 16. The method of producing a heat insulating material according to claim 10, wherein in step S20, the density of the fiber cloth is 2 to 150g/m 2 .
  17. 17. The method of claim 16, wherein in the step S20, the density of the fiber cloth is 5 to 100g/m 2 .
  18. 18. The method of claim 10, wherein the heat treatment is performed at a temperature of 140 to 220 ℃ in step S30, and/or, The duration of the heat treatment is 30-120 min.
  19. 19. The method according to claim 10, wherein the step S40 comprises disposing an organic material in the cavity of the main body, evacuating the cavity, and sealing the main body to obtain the heat insulating material.
  20. 20. The method of manufacturing a thermal insulation material according to claim 10, wherein step S40 comprises disposing an organic core material, a getter and a desiccant in an inner cavity of a main body, evacuating the inner cavity, and sealing the main body to obtain the thermal insulation material.

Description

Heat insulation material, preparation method thereof and household appliance Technical Field The invention relates to the technical field of heat insulation materials, in particular to a heat insulation material, a preparation method thereof and a household appliance. Background In home appliances (e.g., refrigerators) requiring a refrigerating or freezing function, it is generally required to use a heat insulating material. Conventional thermal insulation materials such as polyurethane rigid foam materials (or rigid polyurethane foams) have thermal conductivities of 19 mW/(mK) to 23 mW/(mK). On one hand, the current heat insulation materials are more and more difficult to meet the design and energy consumption requirements of higher standards in face of the continuously improved low energy consumption requirements. On the other hand, it is also desirable that the material be lightweight to some extent while increasing the usable volume. The Vacuum Insulation Panel (VIP) has better heat insulation performance, has more and more remarkable advantages in the aspects of heat insulation application such as refrigeration or freezing, and the structural composition generally comprises a main core material, a getter/desiccant and an outer packaging film material, wherein the core material is a core material of the vacuum insulation panel, and the material, the structure and the composition of the core material have great influence on the heat conductivity coefficient of the vacuum insulation panel. The VIP core material which is mature in the market at present mainly comprises granular fumed silica and glass fiber, and the fumed silica powder has more contact points and higher contact heat conduction under low vacuum degree. Meanwhile, fumed silica as a core material has the problems of high cost, difficulty in further reducing the heat conductivity coefficient and the like. Organic core materials for vacuum insulation panels made using glass fibers (e.g., rayon fibers) have high porosity and low thermal conductivity. Meanwhile, the glass fiber has the advantages of high temperature resistance, fire resistance, low cost and the like. The glass fiber can well meet the requirements of heat insulation equipment on low energy consumption and high volume, and is currently becoming a main stream material in the market. Glass fibers have some significant drawbacks. First, the glass fiber is cut during the process of producing the core material, which causes a large amount of glass fiber dust to adhere to the skin, mucous membrane and other parts, and generates strong irritation, which is harmful to the body and health. Secondly, the glass fiber industry belongs to the high energy consumption and high pollution industries, and the area of a production factory is also strictly limited. In addition, in the aspect that lower heat conductivity is expected at present, the glass fiber is used as a vacuum insulation panel core material, so that the technical difficulty that the heat conductivity cannot be further reduced is faced. Disclosure of Invention The invention mainly aims to provide a heat insulation material, a preparation method thereof and a household appliance, and aims to provide a heat insulation material with low heat conductivity coefficient. In order to achieve the above object, the present invention provides a heat insulating material, comprising a main body and an organic core material, wherein the main body has an inner cavity, and the organic core material is filled in the inner cavity of the main body; the organic core material comprises fumed silica composite organic fibers. In one embodiment, the fumed silica composite organic fiber comprises fumed silica and an organic fiber: In the fumed silica composite organic fiber, the mass ratio of the fumed silica is 6% -10%, and/or, The fumed silica has a porosity of not less than 85%, and/or, The organic fiber comprises at least one of polypropylene, polyethylene, polyester, polyamide, polyacrylonitrile and polyvinyl alcohol. In one embodiment, the fumed silica has a pore size of 100 to 1000nm, and/or, The length of the aerosil composite organic fiber is L, L is more than or equal to 1mm and less than or equal to 250mm, and/or, The diameter of the aerosil composite organic fiber is D, and D is more than or equal to 0.5 mu m and less than or equal to 50 mu m. In one embodiment, the length of the fumed silica composite organic fiber is L,25 mm≤L≤250 mm. In one embodiment, the fumed silica has a pore size of 200 to 300nm, and/or, The length of the aerosil composite organic fiber is L, L is more than or equal to 1mm and less than or equal to 12mm, and/or, The diameter of the aerosil composite organic fiber is D, and D is more than or equal to 3 mu m and less than or equal to 15 mu m. In one embodiment, the insulating material further comprises a desiccant and a getter disposed within the interior cavity of the body. In one embodiment, the thermal conductivity of the