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Preparation method of modified carbon fiber/SiO2 aerogel composite material

A composite material and modified carbon technology, applied in ceramic products, applications, household appliances, etc., can solve the problems of general mechanical properties of composite materials, weak bonding ability between fibers and matrix, etc. The effect of simple method

Active Publication Date: 2021-12-31
GUIZHOU MATERIAL IND TECH INSTITUE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The mechanical properties of the composite material prepared by this method are average, and the bonding ability between the fiber and the matrix is ​​relatively weak.

Method used

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  • Preparation method of modified carbon fiber/SiO2 aerogel composite material
  • Preparation method of modified carbon fiber/SiO2 aerogel composite material
  • Preparation method of modified carbon fiber/SiO2 aerogel composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] The preparation method of airgel composite material is carried out according to the following steps:

[0059] Step 1: Carbon Fiber Modification:

[0060] (1) Desizing:

[0061] A carbon fiber (Toray T700 CF) fiber segment with a length of 2 m was selected, and the carbon fiber was dried in a vacuum oven to obtain a dry carbon fiber precursor. Then carry out desizing treatment to carbon fiber, put carbon fiber into the mixed solution of acetone and ethanol (volume ratio is 1:1), and carry out ultrasonic treatment desizing 6h, should pay attention to keep solution temperature below 56 ℃ in this process (acetone The boiling point is 56.53°C). After the desizing is completed, the acetone solution on the surface of the carbon fiber is rinsed with ethanol, and then the carbon fiber is put into a vacuum drying oven for drying treatment. The oven temperature is 80°C, and the drying time is 6 hours.

[0062] (2) surface oxidation:

[0063] After desizing the carbon fiber sur...

Embodiment 2

[0076] Other operating steps are the same as in Example 1, the difference is that the mass fraction of carbon fiber accounts for 2wt% of the total mass of carbon fiber and silica gel. For specific sample diagrams, see figure 2 shown.

Embodiment 3

[0078] Other operating steps are consistent with Example 1, the difference is that the mass fraction of carbon fiber accounts for 1wt% of the total mass of carbon fiber and silica gel. For specific sample pictures and SEM pictures, see image 3 shown.

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Abstract

The invention provides a preparation method of a modified carbon fiber / SiO2 aerogel composite material. The preparation method comprises the following steps: carrying out desizing and nitric acid oxidation treatment on carbon fibers, and carrying out surface modification grafting treatment on the carbon fibers by using silane coupling agents KH-550 and KH-560 to obtain modified carbon fibers; and uniformly stirring and dispersing the modified carbon fibers and silicon dioxide wet gel, drying, aging, carrying out hydrophobic modification, soaking, and carrying out freeze drying. According to the preparation method of the aerogel composite material, the modified carbon fibers are adopted to enhance the performance of the SiO2 aerogel, the SiO2 aerogel and the modified carbon fibers are subjected to chemical crosslinking combination, compared with a previous physical combination mode, the mechanical performance of the aerogel composite material is more excellent, the whole operation method is simple, the operation condition is mild, step linkage is tight, and the prepared material is good in performance.

Description

technical field [0001] The invention relates to the field of airgel preparation, in particular to a modified carbon fiber / SiO 2 Preparation method of airgel composite material. Background technique [0002] Silicon dioxide (SiO 2 ) Airgel is a kind of nanoporous solid material formed by the aggregation of colloidal particles or nanoparticles with gas as the dispersion medium. It has excellent characteristics such as ultra-light, ultra-low thermal conductivity, high light transmission and high specific surface area. SiO 2 Aerogels have broad application prospects in thermal insulation, adsorption, aerospace and other fields. However, SiO 2 Aerogels have disadvantages such as low strength, poor toughness, brittleness, and easy moisture absorption, which limit their applications in different fields. [0003] Currently, for enhanced SiO 2 For the mechanical properties of airgel, researchers use a variety of fiber materials (mullite fiber, glass fiber, etc.) and SiO 2 Airg...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B30/02C04B38/00C04B20/02C04B14/38
CPCC04B30/02C04B20/023C04B2201/32C04B2201/50C04B14/386C04B14/064C04B38/0045
Inventor 秦舒浩罗丹龙丽娟向宇姝单春燕张凯何敏于杰
Owner GUIZHOU MATERIAL IND TECH INSTITUE
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