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 suc

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0022] The present invention provides a method for preparing alumina short fibers, including the following steps:

[0023] a) After mixing the polyaluminum chloride sol and silica sol, they are successively hydrolyzed and concentrated by the first distillation to obtain a silica-aluminum composite spinning solution; then spinning aids are added for the second distillation and concentration, and then the viscosity is controlled. Obtain a spinning solution with a 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 fiber obtained in step b) to obtain fiber cotton embryo; finally, extruding to obtain alumina short fiber.

[0026] In the present invention, the polyaluminum chloride sol and the silica sol are mixed first, followed by hydrolysis and first distillation and concentration to obtain a silica-aluminum composite spinning solution. In the present invent...

Example Embodiment

[0058] Example 1

[0059] (1) Heat and reflux 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 Polyaluminum chloride sol with a content of 20wt%; according to the mass ratio of alumina in the aluminum source to silica in the silicon source of 67:33, weigh the aluminum source and the silica sol and mix them uniformly;

[0060] Stir the above-mentioned mixed solution evenly and hydrolyze it at 60°C for 1.5h, then heat it 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 ratio of 2% of the total solid content of alumina and silica, add a spinning aid 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 , Sealing; aging to obtain a clear and transparent sol, control the viscosity of...

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PUM

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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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