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Surface modification method for quartz fibre

A quartz fiber and surface modification technology, which is applied in the field of quartz fiber composite materials, can solve problems affecting the interfacial bonding force of composite materials, etc.

Inactive Publication Date: 2011-11-23
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the coating layer on the surface of the general quartz fiber is an organic epoxy resin, which will be carbonized at 400-500°C, and free carbon will be generated, which will affect the interfacial bonding force of the composite material.

Method used

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  • Surface modification method for quartz fibre
  • Surface modification method for quartz fibre
  • Surface modification method for quartz fibre

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Preparation of 200nm silica spheres (stober method)

[0027] Mix a certain amount of ammonia water, water and ethanol in a three-necked round-bottomed flask, and stir in a magnetic stirrer at a constant temperature of 25°C for 10 minutes, then slowly drop in tetraethyl orthosilicate, then seal and stir until the reaction is complete, and let it stand for a while. for 3-6h, centrifuged, and finally the SiO 2 The precipitate is washed to neutrality, and dried at room temperature -100°C to obtain 200nm monodisperse SiO 2 small ball.

[0028] Tetraethyl silicate molar concentration: 0.03mol / L

[0029] Molar concentration of ammonia water: 0.1mol / L

[0030] Deionized water concentration: 0.05mol / L

[0031] Response time: 240min

[0032] Stirring speed: 1000r / min

[0033] (2 surface treatment of quartz fiber

[0034] ① Ablation

[0035] Put the quartz fiber in a muffle furnace for heat treatment, burn candles at 400°C, keep the temperature for another 30 minutes, ...

Embodiment 2

[0044] (1) Preparation of 300nm silica spheres (stober method)

[0045] Mix a certain amount of ammonia water, water and ethanol in a three-necked round-bottomed flask, and stir in a magnetic stirrer at a constant temperature of 25°C for 10 minutes, then slowly drop in tetraethyl orthosilicate, then seal and stir until the reaction is complete, and let it stand for a while. for 3-6h, centrifuged, and finally the SiO 2 The precipitate is washed to neutrality, and dried at room temperature -100°C to obtain 300nm monodisperse SiO 2 small ball.

[0046] Tetraethyl silicate molar concentration: 0.03mol / L

[0047] Molar concentration of ammonia water: 0.05mol / L

[0048] Deionized water concentration: 0.7mol / L

[0049] Response time: 360min

[0050] Stirring speed: 600r / min

[0051] (2) Surface treatment of quartz fiber

[0052] ① Ablation

[0053] Put the quartz fiber in a muffle furnace for heat treatment, burn candles at 400°C, keep the temperature for another 30 minutes, an...

Embodiment 3

[0063] (1) Preparation of 400nm silica spheres (stober method)

[0064] Mix a certain amount of ammonia water, water and ethanol in a three-necked round-bottomed flask, and stir in a magnetic stirrer at a constant temperature of 25°C for 10 minutes, then slowly drop in tetraethyl orthosilicate, then seal and stir until the reaction is complete, and let it stand for a while. for 3-6h, centrifuged, and finally the SiO 2 The precipitate is washed to neutrality, and dried at room temperature -100°C to obtain 400nm monodisperse SiO 2 small ball.

[0065] Tetraethyl silicate molar concentration: 0.015mol / L

[0066] Molar concentration of ammonia water: 0.1mol / L

[0067] Deionized water concentration: 0.7mol / L

[0068] Response time: 480min

[0069] Stirring speed: 600r / min

[0070] (2) Surface treatment of quartz fiber

[0071] ① Ablation

[0072] Put the quartz fiber in a muffle furnace for heat treatment, burn candles at 400°C, keep the temperature for another 30 minutes, ...

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Abstract

The invention discloses a surface modification method for quartz fibre, belonging to the technical field of quartz fibre composite material, and relating to a method for self-assembling silicon dioxide particles on the surface of the quartz fibre. The method comprises the following steps: preparing monodisperse SiO2 globules of which the grain diameter is 100-600 nm; ablating the quartz fibre, and carrying out infiltration surface treatment; dipping the quartz fibre subjected to surface treatment in collosol so that the surface of the quartz fibre is coated with one layer of metallic oxide film with positive charges; and dipping the quartz fibre with the positive charges in turbid liquid of silicon dioxide colloidal solid so as to finally obtain the product. In the invention, the quartz fibre is treated with alumina colloidal (or other colloidals) and silica colloidal, so that the surface of the quartz fibre is coated with two layers of inorganic substances, the mechanical property ofthe quartz fibre at high temperature is improved; the interface performance of a quartz fibre based composite material is improved; and the mechanical property of the composite material at high temperature is improved.

Description

technical field [0001] The invention belongs to the technical field of quartz fiber composite materials, in particular to a method for modifying the surface of quartz fibers. Background technique [0002] Quartz fiber refers to a special glass fiber with a silica content of more than 99.90% and a wire diameter of 1-15 μm. It has high heat resistance, excellent electrical insulation and outstanding mechanical properties, and can be used below 1050 °C for a long time. , instantaneous high temperature up to 1700 ℃. Quartz fibers are widely used in the reinforcement of high-temperature ceramic matrix composites in missile radomes. During the high-speed flight of the missile, a large amount of heat is generated due to the friction between the missile body and the air, so it is required that the composite material used for the radome must have excellent high-temperature thermal properties. However, the coating layer on the surface of the general quartz fiber is an organic epoxy ...

Claims

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Application Information

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IPC IPC(8): C03C25/42
Inventor 史翎高俊彦王坤婵张军营
Owner BEIJING UNIV OF CHEM TECH
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