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CN-120574459-B - Thermal insulation material, preparation method thereof and cold storage plate

CN120574459BCN 120574459 BCN120574459 BCN 120574459BCN-120574459-B

Abstract

The invention belongs to the technical field of heat preservation materials, and particularly relates to a novel heat preservation material, a preparation method thereof and a refrigeration plate. The novel heat insulation material comprises the following raw materials of 70-80 parts of polystyrene particles, 5-7 parts of methyl octabromoether, 0.5-1 part of ethanol, 2-5 parts of freon and 14-16 parts of modified graphite powder. The novel heat-insulating material disclosed by the invention is simple in components, obviously reduces the heat conductivity coefficient after being prepared by compounding, has high strength, compression resistance and fireproof and waterproof properties, can be used for manufacturing a cold-storage plate, can greatly reduce the thickness under the same heat-insulating requirement, saves the use space, can reduce the dead weight, and has a wide application prospect.

Inventors

  • WU CHANGSHENG
  • ZHANG JIE
  • LIU YANFANG

Assignees

  • 江西江铃集团特种专用车有限公司

Dates

Publication Date
20260508
Application Date
20250630

Claims (8)

  1. 1. The heat insulation material is characterized by comprising the following raw material components in parts by weight: 70-80 parts of polystyrene particles; 5-7 parts of methyl octabromoether; 0.5-1 part of ethanol; 2-5 parts of freon; 14-16 parts of modified graphite powder; the preparation method of the modified graphite powder comprises the following steps: (1) Mixing graphite powder with mixed acid, performing ultrasonic treatment for 2-3h, washing with water to be neutral, and drying; (2) Mixing the pretreated graphite with heptadecafluorodecyl trimethoxysilane, loading the mixture into a ball milling tank, introducing nitrogen to replace air, grinding the mixture for 2 to 3 hours at 400 to 500rpm, and washing the mixture with ethanol for 2 to 3 times; (3) Mixing the graphite obtained in the step (2) with nano boron carbide, modified silicon dioxide and nano fiber in a high-speed mixer for 10-20min to obtain modified graphite powder, The modification method of the modified silicon dioxide comprises the steps of placing silicon dioxide powder into a fluidized bed reactor, exhausting air by using nitrogen, introducing heptadecafluorodecyl trimethoxy silane vapor at 110-125 ℃ for 15-25min, ending the aeration, and cooling.
  2. 2. The thermal insulation material according to claim 1, wherein in the step (1), the mixed acid is mixed acid with a volume ratio of concentrated sulfuric acid to nitric acid of 3:1, and a solid-liquid ratio of the graphite powder to the mixed acid is 1:1-3.
  3. 3. The thermal insulation material according to claim 1, wherein in the step (2), the heptadecafluorodecyl trimethoxysilane is used in an amount of 4-6% of the mass of the graphite powder.
  4. 4. The thermal insulation material according to claim 1, wherein in the step (3), the mass ratio of graphite to nano boron carbide, modified silicon dioxide and nano fiber is 1 (0.05-0.1): (0.3-0.6): (0.2-0.4).
  5. 5. A method of producing a thermal insulation material according to any one of claims 1 to 4, comprising the steps of: S1, adding polystyrene particles, modified graphite powder, methyl octabromoether and ethanol into a high-speed mixer according to a proportion, and fully and uniformly stirring to obtain a mixture; s2, heating the mixture to 180-220 ℃ through a double-screw extruder to enable polystyrene particles to be melted and plasticized, and injecting freon into the extruder to form a uniform melt; S3, extruding the melt through an extruder head, and rapidly cooling; s4, cutting the shaped plate into a finished plate with a specified size according to requirements; s5, after the finished board is placed for 24-48 hours, checking, packaging and warehousing.
  6. 6. The method for preparing a thermal insulation material according to claim 5, wherein in S1, the stirring speed is 1000-1500rpm, and in S2, the Freon injection pressure is 10-12MPa, and the temperature is 60-80 ℃.
  7. 7. A cold storage plate, which is characterized by being compositely manufactured by glass fiber reinforced plastic and the heat insulation material according to any one of claims 1-4.
  8. 8. A cold-storage plate according to claim 7 is characterized in that the specific manufacturing method comprises the steps of firstly spreading glass fiber reinforced plastic on a plate manufacturing equipment platform, uniformly spreading the prepared double-component polyurethane composite glue on the surface of the glass fiber reinforced plastic through a glue spreading machine, spreading the prepared heat-insulation material on the glue-spread glass fiber reinforced plastic, uniformly spreading the double-component polyurethane composite glue on the heat-insulation material through the glue spreading machine, covering the glass fiber reinforced plastic on the glue-spread heat-insulation material, and finally conveying the heat-insulation material into a pressing plate equipment through a mechanical transmission chain for positive pressure compounding.

Description

Thermal insulation material, preparation method thereof and cold storage plate Technical Field The invention belongs to the technical field of heat preservation materials, and particularly relates to a heat preservation material, a preparation method thereof and a refrigeration plate. Background In the field of cold chain logistics, the heat preservation performance of a refrigerating compartment is important, and the quality and the loss of goods are directly related. The traditional thermal insulation board of the refrigerator compartment is made of polyurethane foam, XPS extruded board and other materials. The polyurethane foam has a heat conductivity coefficient of about 0.023W/(m.K), but has poor performance in terms of heat conduction limitation and is not resistant to high temperature, so that the service life of the refrigerator is limited, and the matched spraying process temperature cannot exceed 100 ℃ for baking. Although the common XPS extruded sheet has good heat preservation and compression resistance, with the continuous rising of the requirements of industry on heat preservation material performance, the requirements of the XPS extruded sheet on further improvement of heat preservation and insulation performance, enhancement of fireproof performance, use performance, energy saving performance and the like are gradually difficult to meet. Therefore, it is necessary to develop a high-performance thermal insulation material. Disclosure of Invention Aiming at the defects of the prior art, the invention provides the heat insulation material, the preparation method thereof and the cold storage plate, wherein the heat insulation material has the advantages of simple components, obviously reduced heat conductivity coefficient after composite preparation, high strength, compression resistance, fire resistance and durability, and can be used for manufacturing the cold storage plate, the thickness can be greatly reduced under the same heat insulation requirement, the use space is saved, the dead weight can be reduced, and the cold storage plate is applied to cold chain logistics, thereby being beneficial to improving the transportation efficiency and reducing the energy consumption and having wide application prospect. In order to achieve the above object, the present invention provides the following technical solutions: The first object of the invention is to provide a heat insulation material, which comprises the following raw material components in parts by weight: 70-80 parts of polystyrene particles; 5-7 parts of methyl octabromoether; 0.5-1 part of ethanol; 2-5 parts of freon; 14-16 parts of modified graphite powder. Further, in the above technical scheme, the preparation steps of the modified graphite powder are as follows: (1) Mixing graphite powder with mixed acid, performing ultrasonic treatment for 2-3h, washing with water to be neutral, and drying; (2) Mixing the pretreated graphite with heptadecafluorodecyl trimethoxysilane, loading the mixture into a ball milling tank, introducing nitrogen to replace air, grinding the mixture for 2 to 3 hours at 400 to 500rpm, and washing the mixture with ethanol for 2 to 3 times; (3) Mixing the graphite obtained in the step (2) with nano boron carbide, modified silicon dioxide and nano fiber in a high-speed mixer for 10-20min to obtain modified graphite powder. According to the technical scheme, graphite powder is pretreated by acid to improve the surface activity of the graphite powder, then the graphite powder is mixed with heptadecafluorodecyl trimethoxy silane for ball milling, a perfluoroalkyl group on the surface of the graphite is formed into a low surface energy layer, finally the graphite powder is mixed with nano boron carbide, modified silicon dioxide and nano fibers at a high speed, the surface activity which can be matched with a follow-up freon foaming agent is formed on the surface of the graphite powder, wherein the nano boron carbide provides directional adsorption capacity, the modified silicon dioxide provides nucleation points, the synergistic effect of the modified silicon dioxide can improve the uniformity of foaming holes, and the nano fibers can penetrate the nano boron carbide and the heptadecafluorodecyl trimethoxy silane to form a three-dimensional network, so that the effects of preventing hole migration agglomeration, limiting the growth space of the foaming holes and improving the interface stability can be achieved. The modified graphite not only has the characteristics of a lamellar structure, high thermal conductivity, flame retardance and the like, but also has good dispersibility after being mixed with PS and a foaming agent, and the advantage of a closed cell honeycomb structure and the modified active site of the modified graphite are utilized, so that the closed cell structure is more dense, uniform and stable, and the overall heat insulation performance of the plate is greatly improved. Further, in the step (1) of t