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A flexible shape-setting phase-change thermal insulation material and its preparation method

A technology of thermal insulation materials and shape-fixed phase change, applied in the direction of heat exchange materials, chemical instruments and methods, etc., can solve the problems of low latent heat of phase change, low thermal conductivity, complex structure of aircraft heat insulation parts, etc., to reduce thermal conductivity Efficiency, improve heat insulation effect, improve the effect of flexibility

Active Publication Date: 2019-10-18
AEROSPACE RES INST OF MATERIAL & PROCESSING TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The shape-fixed phase change material prepared by the existing encapsulation method can prevent the leakage of the phase change material when the content of the phase change material is low, but the latent heat of phase change is low; when the content of the phase change material increases, the latent heat of phase change increases, but cannot Meet the flight environment requirements of high weightlessness and strong vibration
(2) As a thermal insulation material, it should have a low thermal conductivity. However, the existing shape-fixed phase change materials mostly use high thermal conductivity materials such as expanded graphite and porous graphite for adsorption, which cannot meet the thermal insulation performance requirements.
(3) The structure of the heat insulation part of the aircraft is complex, especially the assembly of the phase change heat insulation material in a narrow space needs to be solved

Method used

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  • A flexible shape-setting phase-change thermal insulation material and its preparation method
  • A flexible shape-setting phase-change thermal insulation material and its preparation method

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preparation example Construction

[0037] A method for preparing a flexible shape-setting phase-change thermal insulation material, comprising the steps of:

[0038] 1) Ingredients: Weigh the phase change medium, porous lightweight material, additives and coating materials respectively according to mass percentage;

[0039] 2) Adsorption of porous light materials: heat and melt the phase change medium, add porous light fillers, mix evenly, and pulverize after cooling;

[0040] 3) Composite coating material: use a mixer to knead the phase change material pulverized in step 2) and the coating material to a certain fineness, add additives and knead until uniform;

[0041] 4) Molding and curing: forming and curing by means of molding, extrusion and injection molding.

[0042] Said step 2) after pulverization, the particle size should be between 0.2-2mm.

[0043] The fineness in step 3) should be <50 μm.

[0044] The molding method in step 4) is any one of extrusion molding, compression molding, and injection mol...

Embodiment 1

[0048] (1) 107 silicone rubber: docosane: aerogel: KH550: dibutyltin dilaurate: gasoline is weighed according to the mass ratio of 80:180:10:3:1:4 for standby;

[0049] (2) Heat docosane in an oven at 60°C, add airgel and mix evenly after it is completely melted, and pulverize it to a particle size of 1 mm after cooling to obtain phase change material A;

[0050] (3) Use a mixer to mix the phase change material A pulverized in step 2) with 107 silicone rubber until the fineness is less than 50 μm, add KH550, dibutyltin dilaurate, and gasoline and mix until uniform to obtain phase change material B ;

[0051] (4) Weigh 200g and put the mixed phase change material B evenly into a mold with a size of 200mm×200mm×3mm, use a molding machine to pressurize the mold at room temperature (1-5MPa) for 1-2 hours, after curing is complete The demoulding is a kind of flexible shape-setting phase change thermal insulation material.

[0052] The enthalpy change of the prepared flexible shap...

Embodiment 2

[0056] (1) 108 silicone rubber: butylene glycol: aerogel: tetraethyl orthosilicate: dibutyltin dilaurate: gasoline is weighed according to the mass ratio of 100:300:8:3:1:4 for standby;

[0057] (2) Heat butaline in an oven at 130°C, add airgel and mix evenly after it is completely melted, and crush it to a particle size of about 1mm after cooling;

[0058] (3) Use a mixer to mix the phase change material pulverized in step 2) with 108 silicone rubber until the fineness is less than 50 μm, add ethyl orthosilicate, dibutyltin dilaurate, and gasoline and mix until uniform;

[0059] (4) Weigh 300g and put the mixed phase change material evenly into a mold with a size of 200×200×3mm, use a molding machine to pressurize the mold at room temperature (1-5MPa) for 1-2 hours, and remove it after curing is complete. The mold is a kind of flexible shape-setting phase-change thermal insulation material.

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Abstract

The invention discloses a flexible shape-stabilized phase-change thermal insulation material and a preparation method thereof. The material is prepared with the method as follows: 50wt%-90wt% of a phase-change medium is heated and melted, 1wt%-10wt% of porous light filler is added, the mixture is evenly mixed, cooled and then crushed, the crushed phase-change material and 8%-30% of a coating material are mixed by a mixing machine to have certain fineness, and 1wt%-10wt% of various aids are added for mixing until the mixture is even; shaping is realized through mold pressing, extrusion and injection molding, and the flexible shape-stabilized phase-change thermal insulation material is formed after curing. The flexible shape-stabilized phase-change thermal insulation material prepared with the method has the flexibility smaller than or equal to 2 mm, the thermal conductivity adjustable in a range of 0.1-0.5 W / (m.k), the phase-change temperature adjustable in a range of 25-185 DEG C and the average phase-change enthalpy value adjustable in a range of 150-280 kJ / kg, is not required to be packaged, is still kept in the solid state when the temperature is higher than the phase change point of the material, has the stable shape, is easy to machine and can be conveniently matched with and mounted on a controlled assembly.

Description

technical field [0001] The invention relates to a flexible shape-setting phase change heat insulation material and a preparation method thereof, belonging to the technical field of phase change temperature control materials. Background technique [0002] With the continuous improvement of the design speed of high-speed aircraft such as missiles, the problem of high-temperature thermal environment caused by aerodynamic heating has become more and more serious. In order to ensure the safety of the main structure of the aircraft and internal instruments and equipment, it is necessary to use heat-insulating materials to prevent the external heat from flowing to the inside. transfer. Traditional ceramic heat insulation tiles, ceramic fiber heat insulation blankets and other heat insulation materials reduce the heat conduction speed through a low heat transfer coefficient. The harsher the flight environment, the thicker the heat insulation layer, and the increase in the thickness...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K5/06
Inventor 赵立波罗正平卢鹉李俊峰金珂
Owner AEROSPACE RES INST OF MATERIAL & PROCESSING TECH
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