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Preparation method of alumina short fibers

A short fiber, alumina technology, applied in the direction of inorganic raw material rayon, etc., can solve the problems of uneven thickness of alumina fiber blankets, fibers cannot be scattered in time, affecting the uniformity of cloth and cotton, and achieves good uniformity and good interaction. Effect, the effect of not easy to combine

Active Publication Date: 2020-05-12
山东鲁阳浩特高技术纤维有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The industrial preparation method of alumina staple fiber is the sol-gel-spinning process. When the spinning process is used to form fibers, due to the fast rotation speed of the spinning disc, the fibers are too long to cause problems such as fiber paralleling, adhesion, and fiber curling. And the fibers cannot be scattered in time, which also affects the uniformity of the cloth and cotton, resulting in the problem of uneven thickness in the prepared alumina fiber blanket

Method used

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preparation example Construction

[0022] The invention provides a kind of preparation method of alumina short fiber, comprises the following steps:

[0023] a) After mixing the polyaluminum chloride sol and the silica sol, they are successively hydrolyzed and concentrated by the first distillation to obtain a silicon-aluminum composite spinning solution; then the spinning aid is added for the second distillation and concentration, and then the viscosity is controlled. Obtain a spinning solution with room temperature viscosity of 1500MPa·s~2200MPa·s;

[0024] b) spinning the spinning solution obtained in step a) to obtain precursor fibers;

[0025] c) heat-treating the precursor fibers obtained in step b) to obtain fiber cotton buds; and finally extruding to obtain alumina short fibers.

[0026] In the invention, the polyaluminum chloride sol and the silica sol are firstly mixed, followed by hydrolysis and the first distillation concentration in sequence to obtain the silicon-aluminum composite spinning soluti...

Embodiment 1

[0059] (1) Heat aluminum powder, hydrochloric acid (calculated as HCl) and distilled water at a molar ratio of 1.8:1:22.2 at 100°C to obtain Al 2 o 3 A polyaluminum chloride sol with a content of 20wt%; according to the mass ratio of aluminum oxide in the aluminum source and silicon oxide in the silicon source being 67:33, weigh the aluminum source and the silica sol respectively and mix them uniformly;

[0060] Stir the above mixed solution evenly, hydrolyze at 60°C for 1.5h, heat up to 90°C and distill and concentrate for 2.5h to obtain a transparent and uniform silicon-aluminum composite spinning solution with a viscosity of 400MPa·s (50°C);

[0061] Then, according to the proportion that the added amount is 2% of the sum of the solid content of alumina and silica, add the spinning aid configured with a mass concentration of 6%; then continue to distill and concentrate the above mixed solution at 90°C for 0.7h and take it out , sealed; aging to obtain a clear and transpare...

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Abstract

The invention provides a preparation method of alumina short fibers. The preparation method includes the following steps that (a) after poly aluminum chloride sol and silica sol are mixed, and hydrolyzing and first distillation concentrating are carried out sequentially to obtain a silicon aluminum composite spinning solution; then a spinning aid is added for second distillation concentration, andthen viscosity control is carried out to obtain a spinning solution with a room temperature viscosity of 1500MPa.s-2200MPa.s; (b) the spinning solution obtained in the step (a) is subjected to spinning to obtain precursor fibers; and (c) the precursor fibers obtained in the step (b) are heated to obtain a fiber grey cotton, and finally squeezing is carried out to obtain the alumina short fibers.Compared with the prior art, the preparation method first uses a specific formula to obtain the spinning solution suitable for a spinning process, and then specific process steps and conditions are combined to achieve better interaction; and the obtained alumina short fibers are short in fibers and easy to disperse, the problems of fiber stranding, adhesion and fiber curling during the spinning process are not prone to occurring, and meanwhile, the thickness deviation on the two sides of the obtained grey cotton is small and the uniformity is good.

Description

technical field [0001] The invention relates to the technical field of alumina fibers, in particular to a preparation method of alumina short fibers. Background technique [0002] The main aspect of the application of alumina fiber is as a reinforcing material for other products, and its strength is higher than that of ordinary ceramic fibers; if the fiber is too long and entangled, it will not be easy to disperse evenly during the application process, increasing the labor intensity during use . [0003] The application of alumina short fiber is relatively narrow, and it is prepared into products such as alumina fiber blanket and its module, which greatly broadens its application field. The industry often adopts spinning process to prepare alumina fiber into alumina fiber blanket through dry needling; therefore, higher requirements are put forward for the preparation of alumina short fiber. The industrial preparation method of alumina staple fiber is the sol-gel-spinning p...

Claims

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Application Information

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IPC IPC(8): D01F9/08
CPCD01F9/08
Inventor 傅超岳耀辉郑维金鹿明陈贵华李传勇宋志庆郭忠海赵业娟
Owner 山东鲁阳浩特高技术纤维有限公司
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