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Sol-gel preparing and spinning method of ultrafine continuous alumina fibers

An alumina fiber, sol-gel technology, applied in the direction of inorganic raw material rayon, etc., can solve the problems of poor continuity of continuous alumina spinning, product performance indicators need to be improved urgently, fiber softness is difficult to weave and other problems, and the cost is achieved. Low, small pore size, high spinning pressure effect

Inactive Publication Date: 2020-03-27
莫纶珠海新材料科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Technical problem: Aiming at the problems that the existing preparation of continuous alumina spinning has poor continuity, product performance indicators need to be improved urgently, and the fiber is not soft enough to be woven, the invention provides a preparation process of ultrafine alumina fiber sol-gel and spinning Filament and reactor, making fiber products with high strength, fine fiber diameter and softness

Method used

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  • Sol-gel preparing and spinning method of ultrafine continuous alumina fibers
  • Sol-gel preparing and spinning method of ultrafine continuous alumina fibers

Examples

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preparation example Construction

[0034] Preparation of precursor sol: add aluminum salt in deionized water, heat to 80°C-100°C, the aluminum salt is inorganic aluminum salt or organic aluminum salt, the molar ratio of deionized water to the aluminum salt is 5:1- 35:1, stir evenly, add aluminum powder or alumina, the molar ratio of aluminum powder or alumina to aluminum salt is 0.2:1-10:1, heat and reflux for 8-24 hours to obtain aluminum sol; Add acid and silicon precursor to the sol, the acid is an inorganic acid or organic acid as a catalyst, the molar ratio of the acid to the aluminum salt is 1:1-1:10, so that the pH value of the aluminum sol is in the range of 2-6 Inside; then add spinning aid and sintering aid, wherein the mass ratio of spinning aid to the aluminum salt is 1:50-1:200, and the mass ratio of the sintering aid to the aluminum salt is 1:100 -1:200, mix and stir the precursor sol evenly;

[0035] Preparation of spinnable gel: Put the precursor sol into a reaction kettle protected by a consta...

Embodiment 1

[0044] Add 220 grams of aluminum nitrate and 800 grams of deionized water into the flask, heat to 100°C, stir magnetically for 1 hour, slowly add 100 grams of aluminum powder (content not less than 99%), heat and reflux for 24 hours to obtain aluminum sol . Add 100ml of tartaric acid and 5 grams of zirconium acetate (compared to about 4% of the mass of aluminum powder) into the aluminum sol, and after vigorous stirring, add 10 grams of spinning aid polyethylene glycol with a concentration of 10%, and add 12 grams of 0.5 g of tetraethyl orthosilicate and magnesium nitrate to obtain a precursor sol mixture.

[0045] The precursor sol mixture was concentrated under vacuum and reduced pressure for 10 hours under a constant temperature water bath condition of 80° C. in a reaction kettle to obtain a gel solution with a pH of 2.0 and a viscosity of 70000 cps.

[0046] After the gel solution passes through the metering device under the pressure of 1.5MPa, it passes through the spinne...

Embodiment 2

[0049] Add 200 grams of aluminum chloride hexahydrate and 1000 grams of deionized water into the flask, heat to 80 °C, stir magnetically for 1 hour, slowly add 150 grams of aluminum powder (content not less than 99%), and heat back for 10 hours. Aluminum sol was obtained. Add 100ml of hydrochloric acid to the aluminum sol, 5 grams of zirconium acetate (compared to about 5% of the quality of the aluminum powder), and after vigorous stirring, add 10 grams of spinning aid polyvinyl alcohol with a concentration of 10%, and add 1 gram of silica sol and 0.5 g of magnesium nitrate to obtain a precursor sol mixture.

[0050] The precursor sol mixture was concentrated under vacuum and reduced pressure for 8 hours at a constant temperature of 30° C. in a collective reaction kettle to obtain a gel solution with a pH of 4.0 and a viscosity of 20,000 cps.

[0051] After the gel solution passes through the metering device under the pressure of 1.5MPa, it passes through the spinneret. The n...

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Abstract

The invention relates to a sol-gel preparing and spinning method and a reaction kettle of ultrafine continuous alumina fibers. Main raw materials adopted by the preparation method are aluminum powder,alumina and silica. A precursor technology is adopted, a precursor of aluminum is aluminum or aluminum oxide or an inorganic or organic salt solution of aluminum, and a precursor of silicon is tetraethoxysilane, tetramethyl orthosilicate, water-soluble silicone oil, silica sol or silane. The reaction kettle used in the preparation process comprises a liftable stirrer, a circulating medium liquidstorage tank and a kettle body, and meets the complex operation requirements of the special material preparation method.

Description

technical field [0001] The invention relates to a preparation process of superfine alumina fiber sol-gel and a spinning and reaction kettle, belonging to the field of inorganic small molecule ceramic fibers. Background technique [0002] Due to the continuous alumina ceramic fiber has high strength, high modulus, good heat resistance, high temperature oxidation resistance, low thermal conductivity, low thermal expansion coefficient, good thermal shock resistance, corrosion resistance, easy to compound with ceramic metal resin matrix And many other advantages, has been widely concerned. Foreign countries have adopted a strong blockade attitude towards the production of alumina fiber. Well-known domestic universities, scientific research institutes, and production enterprises are also committed to the research and development of high-performance alumina ceramic fibers. [0003] The production path of alumina fiber is relatively simple, the raw materials are easy to obtain, a...

Claims

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Application Information

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IPC IPC(8): C04B35/10D01F9/08C04B35/622C04B35/624C04B35/634C04B35/636
CPCC04B35/62236C04B35/624C04B35/63416C04B35/63436C04B35/63488C04B35/6365C04B2235/3206C04B2235/3244C04B2235/3418D01F9/08
Inventor 张德育马小民王慧崔吟雪李富萍
Owner 莫纶珠海新材料科技有限公司
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