Viscosity homogenizing/bubble removing integrated device and method for preceramic polymer spinning melt

A technology of ceramic precursors and polymers, which is applied in the fields of spinning solution filtration, filament forming treatment, textiles and papermaking, etc. It can solve the problems of adverse effects of fiber spinning, inability to melt degassing, and degradation of raw silk quality. Achieve the effects of improving the defoaming efficiency and melt viscosity uniformity, reducing the defects of the original fiber, and avoiding chemical reactions

Active Publication Date: 2019-08-23
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Obviously, this method has low degassing efficiency, low production capacity, and cannot achieve uniform and thorough degassing of the melt.
On the other hand, due to the large volume of the melting kettle, the heating is generally completed by the heat medium or the electric heating body outside the kettle wall, and the heat transfer is transmitted from the ke

Method used

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  • Viscosity homogenizing/bubble removing integrated device and method for preceramic polymer spinning melt
  • Viscosity homogenizing/bubble removing integrated device and method for preceramic polymer spinning melt

Examples

Experimental program
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Effect test

Embodiment 1

[0035] refer to figure 1 , the uniform viscosity / degassing integrated device of the ceramic precursor polymer spinning melt, comprising a defoaming kettle body 1, the top of the defoaming kettle body 1 is provided with a kettle body upper cover 2, the inner wall surface of the defoaming kettle body 1 and The airtight cavity surrounded by the lower surface of the kettle body upper cover 2 is the inner cavity 100 of the degassing kettle body. Spinning metering pump 63 is provided, and No. 1 umbrella-shaped diversion surface 3, No. 2 anti-umbrella-shaped diversion surface 4, No. 3 umbrella-shaped diversion surface 5, and No. The No. 1 diversion uniform temperature curved surface 6, the No. 1 umbrella-shaped diversion surface 3, the No. 2 anti-umbrella-shaped diversion surface 4, and the No. 3 umbrella-shaped diversion surface 5 are all connected to the inner wall of the degassing kettle body 1, and the No. 1 umbrella-shaped diversion surface The junction of the umbrella-shaped ...

Embodiment 2

[0053] The difference between this embodiment and embodiment 1 is:

[0054] The melt to be defoamed is the precursor polymer polyaluminocarbosilane (PACS) containing aluminum silicon carbide fibers, and its softening point is 220°C.

[0055] According to the softening point of the polymer to be spun, the temperature of the heat medium in the heat medium inner cavity 200 of the homogenizing / defoaming integrated device is set, the temperature of the heat medium is set to 310° C., and the heat preservation time of the heat medium circulation system is started for 3 hours. When the degree of vacuum in the inner chamber 100 of the degassing kettle of the homogenizing / degassing integrated device is -80kPa, close the valve on the first vacuum connecting pipe 22 . The speed of the feed metering pump 23 was 20 rpm and the pump speed of the spinning metering pump was 19 rpm.

[0056] All the other are with embodiment 1.

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Abstract

The invention relates to a viscosity homogenizing/bubble removing integrated device and method for a preceramic polymer spinning melt. The device comprises a bubble removing kettle and is characterized in that the upper portion of the bubble removing kettle or a kettle upper cover is provided with a feeding metering pump, the bottom of the bubble removing kettle is provided with a spinning metering pump, a first umbrella-shaped guide face, a second umbrella-shaped guide face, a third umbrella-shaped guide face and a fourth guide and temperature homogenizing arc face are sequentially arranged in the inner cavity of the bubble removing kettle from top to bottom, the joint of the first umbrella-shaped guide face and the inner wall of the bubble removing kettle is provided with a first overflow seam, and the joint of the second umbrella-shaped guide face and the inner wall of the bubble removing kettle is provided with a second overflow seam. The method uses the viscosity homogenizing/bubble removing integrated device to perform viscosity homogenizing and bubble removing. The viscosity homogenizing/bubble removing integrated device and method has the advantages that bubbles in the spinning melt can be completely removed while melt temperature and viscosity homogenizing can be achieved, bubble removing efficiency and melt viscosity uniformity are increased, the breaking and deformation of thin spinning flow and fiber breakage during spinning can be avoided, original fiber defects can be reduced, and the performance of the finished-product ceramic fibers can be increased.

Description

technical field [0001] The invention belongs to the field of fiber preparation, and in particular relates to a device and method for homogenizing / defoaming integrated ceramic precursor polymer spinning melt. Background technique [0002] Continuous SiC fiber, Si 3 N 4 Fiber, SiBN(C) fiber and other high-performance continuous ceramic fibers are key raw materials for aerospace and military applications due to their high temperature resistance, high strength, high modulus and special electromagnetic properties. The precursor conversion method is a common method for preparing high-performance continuous ceramic fibers. The steps are to first synthesize ceramic precursor polymers such as polycarbosilane, polycarbosilane and polysilazane, and then melt spinning, non-melting and high-temperature heating Solution, the continuous ceramic fiber can be prepared. [0003] The melt spinning of ceramic precursor polymer is a key step in the preparation of continuous ceramic fibers, be...

Claims

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Application Information

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IPC IPC(8): D01D1/10D01D1/06D01D1/09
CPCD01D1/065D01D1/09D01D1/103
Inventor 王应德王兵王军王浩简科邵长伟苟燕子王小宙
Owner NAT UNIV OF DEFENSE TECH
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