Preparation method of thermal insulating material having ultralow density, ultrahigh elasticity and ultralow thermal conductivity

An ultra-low density, heat insulating material technology, applied in the fields of nanotechnology, nanotechnology, nanotechnology for materials and surface science, and can solve the problems of high density, high thermal conductivity, and low material elasticity of heat insulating materials. To achieve the effect of stable performance, simple process and high production efficiency

Inactive Publication Date: 2014-04-16
HARBIN INST OF TECH
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0008] The purpose of the present invention is to solve the problems of high density, low material elasticity and high thermal conductivity of the heat insulation materials of aviation and aerospace vehicles prepared by the existing method, and provide a kind of insulation material with ultra-low density, ultra-high elasticity and ultra-low thermal conductivity. Preparation method of thermal insulation material with high performance

Method used

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  • Preparation method of thermal insulating material having ultralow density, ultrahigh elasticity and ultralow thermal conductivity
  • Preparation method of thermal insulating material having ultralow density, ultrahigh elasticity and ultralow thermal conductivity
  • Preparation method of thermal insulating material having ultralow density, ultrahigh elasticity and ultralow thermal conductivity

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specific Embodiment approach 1

[0033] Specific Embodiment 1: In this embodiment, a method for preparing a thermal insulation material with ultra-low density, ultra-high elasticity and ultra-low thermal conductivity is realized according to the following steps:

[0034] 1. Preparation of graphene oxide: Add natural flake graphite into strong oxidizing mixed acid, stir for 10min-60min at a stirring speed of 100r / min-800r / min, then add strong oxidant permanganate in 3-10 times Potassium to prepare mixture A, and then put mixture A in a water bath at 30°C to 80°C, and stir at a constant temperature for 4h to 20h under the condition of a stirring speed of 200r / min to 800r / min, to obtain mixture B, and then put mixture B Adding into ice water, and adding hydrogen peroxide with a mass fraction of 30% to the ice water to obtain a graphite oxide suspension, carrying out suction filtration and washing of the graphite oxide suspension, centrifugal washing and drying, to obtain graphene oxide;

[0035] Wherein, the vol...

specific Embodiment approach 2

[0047] Embodiment 2: This embodiment is different from Embodiment 1 in that the volume ratio of the strong oxidizing mixed acid described in Step 1 to the mass ratio of natural flake graphite is (100mL-200mL): 1g. Other parameters are the same as in the first embodiment.

specific Embodiment approach 3

[0048] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is that the strong oxidizing mixed acid described in step one is composed of phosphoric acid with a mass fraction of 10% to 85% and sulfuric acid with a mass fraction of 10% to 98%. , the volume ratio of phosphoric acid with a mass fraction of 10% to 85% and sulfuric acid with a mass fraction of 10% to 98% is (3 to 10):1. Other parameters are the same as those in Embodiment 1 or 2.

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Abstract

The invention provides a preparation method of a thermal insulating material having ultralow density, ultrahigh elasticity and ultralow thermal conductivity, and relates to a preparation method of a thermal insulating material. The preparation method provided by the invention aims to solve the problems of high intensity, low elasticity and high heat conductivity coefficient of aerial and aerospace craft thermal insulating materials prepared by the existing method. The preparation method comprises the following steps of 1, preparing oxidized graphene; 2, preparing an oxidized graphene dispersion liquid; 3, preparing a carbon nano-tube dispersion liquid; 4, preparing an oxidized graphene / carbon nano-tube solution; 5, freeze drying; 6, reducing oxidized graphene-carbon nano-tube sponge; and 7, drying to obtain the oxidized graphene-carbon nano-tube sponge which is ultralow in density, ultrahigh in elasticity and ultralow in thermal conductivity, and then finishing the preparation method of the thermal insulating material ultralow in density, ultrahigh in elasticity and ultralow in thermal conductivity. The preparation method of the thermal insulating material having ultralow in density, ultrahigh in elasticity and ultralow in thermal conductivity is applied to the field of the preparation of the aerial and aerospace materials.

Description

technical field [0001] The invention relates to a preparation method of a heat insulating material. Background technique [0002] With the development of science and technology, the research on aerospace, aviation, intercontinental missiles and other aircraft in various countries is getting more and more in-depth. In the process of design and research, the heat insulation protection of various aircraft has become an unavoidable problem. The heat insulation materials used in aircraft must not only have the characteristics of low density, low thermal conductivity and high temperature resistance, but also have the characteristics of high heat insulation efficiency and high elasticity. [0003] On the one hand, the density of heat insulation materials required by aircraft must be low, but materials with low density tend to have poor compressive and tensile strengths. For supersonic aircraft, it is important to have a certain strength to resist corresponding impacts. On the othe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04B82Y40/00B82Y30/00C01B32/184
Inventor 李宜彬秦余杨赫晓东李建军魏丽红
Owner HARBIN INST OF TECH
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