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PI short-cut fiber reinforced flexible silicon dioxide aerogel composite material and preparation method thereof

A composite material and silicon dioxide technology, applied in ceramic products, other household appliances, household appliances, etc., can solve the problems of inability to achieve effective control of composite material mechanics, thermal and sound insulation performance, separation of matrix and fiber, poor bonding effect, etc. problems, to achieve the effect of safe and controllable production process, improve mechanical properties, and reduce raw material costs

Inactive Publication Date: 2019-09-20
NAVAL UNIV OF ENG PLA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the poor bonding effect between the fiber and the airgel in the organic fiber reinforced silica airgel, the composite material is prone to separation between the matrix and the fiber during the compression process, and the phenomenon of powder and slag falling occurs.
[0007] Chinese invention patent (application publication number: CN101973752A, application publication date: 2011-02-16) discloses glass fiber reinforced silica airgel composite material and its preparation method, by combining glass fiber and silica airgel Formation, but because only a single length of chopped fibers can be added, it is not possible to achieve effective regulation of mechanical, thermal and sound insulation properties of composite materials

Method used

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  • PI short-cut fiber reinforced flexible silicon dioxide aerogel composite material and preparation method thereof
  • PI short-cut fiber reinforced flexible silicon dioxide aerogel composite material and preparation method thereof
  • PI short-cut fiber reinforced flexible silicon dioxide aerogel composite material and preparation method thereof

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preparation example Construction

[0047] The invention discloses a method for preparing a PI chopped fiber reinforced flexible silica airgel composite material, which comprises the following steps:

[0048] 1) Prepare micelles or microemulsions: add 30mL deionized water to a beaker, then add an acidic catalyst to make the solution pH = 3-4, stir for 5 minutes, add 0.1-5g surfactant, and stir for 20-60 minutes;

[0049] 2) Preparation of sol: Add silicon source according to the volume ratio of silicon source and deionized water as 1: (0.5~6), continue stirring at room temperature for 3~5 hours, and then add a certain amount of molar concentration of 1~6.5mol / L ammonia water until the solution pH=7~8, and continue to stir for 0.5~1h;

[0050] 3) Add reinforcement phase: place the sol in a water bath at 40-80°C, and observe its viscosity value through a viscometer. The kinematic viscosity of the sol is 20-50mm 2 / s, add 0.01~0.2g of polyimide fiber with a length of 3~10mm, stir evenly, and wait for the gel;

[...

Embodiment 1

[0055] Add 30mL deionized water to the beaker, then add acetic acid to make the solution pH=3~4, stir for five minutes, add 0.4g cetyltrimethylammonium bromide CTAB, stir for 20min, then add 7.5mL methyl triethyl ammonium bromide Oxysilane MTES, continue to stir at room temperature for 4h. Then add a certain amount of ammonia water with a molar concentration of 1 mol / L until the pH of the solution is 7, and continue stirring for 1 h. Place the sol in a 60°C water bath, and observe its viscosity value through a viscometer. The kinematic viscosity of the sol is 20mm 2 / s, add 0.1g of polyimide fiber with a length of 3mm, and stir evenly, waiting for the gel. The wet gel was aged at 60 °C for two days, followed by replacement with deionized water for 8 h in a 60 °C water bath to remove surfactants and other unreacted substances. After replacement, replace with ethanol 3 times at room temperature, 12 hours each time. Finally with CO 2 SiO obtained by supercritical drying 2 ai...

Embodiment 2

[0057] Add 30mL deionized water to the beaker, then add acetic acid to make the solution pH=3~4, stir for five minutes, add 0.2g cetyltrimethylammonium bromide CTAB, stir for 20min, then add 7.5mL methyl triethyl ammonium bromide Oxysilane MTES, continue to stir at room temperature for 4h. Then add a certain amount of ammonia water with a molar concentration of 1mol / L until the pH of the solution is 7, continue to stir for 1 hour, place the sol in a water bath at 60°C, and observe its viscosity value with a viscometer until the viscosity of the sol is 25mm 2 / s, add 0.1g of polyimide fibers with a length of 5mm, and stir evenly, waiting for the gel. The wet gel was aged at 60 °C for two days, followed by replacement with deionized water for 8 h in a 60 °C water bath to remove surfactants and other unreacted substances. After replacement, replace with ethanol 3 times at room temperature, 12 hours each time. Finally with CO 2 SiO obtained by supercritical drying 2 airgel.

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Abstract

The invention discloses a PI chopped fiber reinforced flexible silicon dioxide aerogel composite material and a preparation method thereof, and belongs to the technical field of high-performance porous materials. The method includes filling the silicon dioxide aerogel porous structure with polyimide fibers to obtain the flexibility-enhanced composite material. The composite material can recover to 60%-80% of the original length under 50% compression deformation. According to the preparation method designed by the invention, deionized water is used as a solvent, polyimide chopped fibers are used as a reinforcing phase, and the viscosity of sol is controlled through a surfactant, so that the chopped fibers with different lengths can be uniformly dispersed; and by optimizing the replacement procedure, the prepared composite material not only has good mechanical properties, but also has good heat insulation and heat preservation properties.

Description

technical field [0001] The invention relates to an airgel material and belongs to the technical field of high-performance porous materials, in particular to a PI chopped fiber reinforced flexible silica airgel composite material and a preparation method thereof. Background technique [0002] Airgel is a new type of nano-porous super thermal insulation material with low density and low thermal conductivity. The unique nano-network structure endows it with good thermal insulation performance. At the same time, due to the high porosity, high specific surface area and extremely small acoustic impedance of airgel, compared with traditional lightweight sound insulation materials, the energy loss of sound waves propagating in its pores is accelerated, showing Better sound insulation performance. Therefore, airgel has great application potential as a lightweight thermal insulation and noise reduction material; however, the mechanical properties of aerogel limit the expansion of its...

Claims

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Application Information

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IPC IPC(8): C04B38/08C04B30/02
CPCC04B30/02C04B2111/40C04B2111/52C04B2201/32C04B16/0691C04B14/064C04B38/08
Inventor 杨自春李肖华李昆峰陈国兵赵爽费志方张震
Owner NAVAL UNIV OF ENG PLA
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