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Polyacrylonitrile as-formed fiber rinsing bath and application

A nascent fiber, polyacrylonitrile technology, applied in the direction of rayon filament cleaning/drying, etc., can solve the problems of inability to adapt to large tow and small tow at the same time, low relative speed of tow and water flow, and poor adjustability of water consumption. , to facilitate real-time monitoring and adjustment, improve washing efficiency, and stabilize temperature.

Active Publication Date: 2015-04-29
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The existing industrial production washing method is mainly leaching, and the relative speed of tow and water flow is small, which cannot be adapted to large tow and small tow at the same time. Improvement, low washing efficiency, poor washing effect

Method used

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  • Polyacrylonitrile as-formed fiber rinsing bath and application
  • Polyacrylonitrile as-formed fiber rinsing bath and application
  • Polyacrylonitrile as-formed fiber rinsing bath and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The washing tank 7 is composed of a housing 13, a water inlet 9, a water outlet 6, a circulating pump 10, a temperature measuring port 5, a heat exchanger 11 and a drafting roller. The housing 13 is a U-shaped tank, the circulating pump 10 and the heat exchange The device 11 is connected to the bottom of the housing 13 through pipes. There is a water outlet 8 in the middle of the bottom of the housing 13, a water inlet 9 at one end of the bottom of the housing 13, and a temperature measuring port 5 on the side of the housing 13. There are drafting rollers installed at both ends of the opening, and the drafting rollers are composed of the same size inlet drafting roller 1, middle drafting roller 2 and outlet drafting roller 3, and the inlet drafting roller 1 and outlet drafting roller The axis center of the roller 3 is on the same horizontal line, the axis center of the middle drafting roller 2 is located on the same horizontal line as the upper top of the feeding draftin...

Embodiment 2

[0029] The three water washing tanks are sequentially distributed on the ground at different heights to form a stepped water washing device, which are 7-a, 7-b, and 7-c from left to right. Deionized water enters the washing tank 7-c through the water inlet 9-c of the 7-c, and the upper water outlet 6-c of the washing tank 7-c is connected with the water inlet 9-b of the washing tank 7-b, and the washing tank 7- The upper water outlet 6-b of b is connected with the water inlet 9-a of the washing tank 7-a, and finally the water is discharged by the upper water outlet 6-a of the washing tank 7-a. The polyacrylonitrile as-spun fiber enters the deionized water in the washing tank 7-a from the drawing roll at one end of the washing tank 7-a, comes out from the drawing roll at the other end of the washing tank 7-a, and enters the washing tank 7-b and 7-c, finally come out from the washing tank 7-c, the as-spun fibers are 1K tow.

[0030] The highest temperature of the water in the w...

Embodiment 3

[0032] The three water washing tanks are sequentially distributed on the ground at different heights to form a stepped water washing device, which are 7-a, 7-b, and 7-c from left to right. Deionized water enters the washing tank 7-c through the water inlet 9-c of the 7-c, and the upper water outlet 6-c of the washing tank 7-c is connected with the water inlet 9-b of the washing tank 7-b, and the washing tank 7- The upper water outlet 6-b of b is connected with the water inlet 9-a of the washing tank 7-a, and finally the water is discharged by the upper water outlet 6-a of the washing tank 7-a. The polyacrylonitrile as-spun fiber enters the deionized water in the washing tank 7-a from the drawing roll at one end of the washing tank 7-a, comes out from the drawing roll at the other end of the washing tank 7-a, and enters the washing tank 7-b and 7-c, finally come out from the washing tank 7-c, the as-spun fiber is 6K tow.

[0033] The highest temperature of the water in the was...

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Abstract

The invention provides a polyacrylonitrile as-formed fiber rinsing bath. The rinsing bath is characterized in that a shell (13) of the rinsing bath is a U-shaped bath; a circulating pump (10) and a heat exchanger (11) are connected with the bottom of the shell (13); an outfall (8) and a water inlet (9) are arranged at the bottom of the shell (13); a temperature measurement hole (5) is arranged on the side of the shell (13); drawing rollers are installed on the shell (13) and comprise silk entering drawing rollers (1), intermediate drawing rollers (2) and silk exiting drawing rollers (3), which are in the same size; a water outlet (6) is arranged on the shell (13) and is on the same level with a rinsing bath liquid level (12); and the water outlet and the water inlet (9) are arranged at the two ends of the shell (13). The rinsing bath has the advantages of uniform water temperature distribution, simultaneous suitability for big and small tows, high rinsing efficiency and good effect.

Description

technical field [0001] The invention belongs to a fiber washing device, in particular to a washing tank for primary polyacrylonitrile fibers and its application. Background technique [0002] High-quality polyacrylonitrile fiber precursors are the prerequisite for the production of high-performance carbon fibers. In the production process of polyacrylonitrile fiber precursor, water washing is an important process, and its main purpose is to reduce the content of solvent in the fiber. The fibers in the spinning process of the original silk are called primary fibers. The primary fiber contains a certain amount of solvent, and the residual solvent content in the raw silk is too high, which will cause the fiber to feel rough and hard, dark in color, sticky, and the fiber is prone to yellowing during drying and heat setting. Plasticizers have a greater negative impact and significantly reduce the mechanical properties of carbon fibers. In order to ensure fiber quality and oxid...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01D10/06
Inventor 吕春祥蔡文有李东升张寿春赵振波李燕生张君翔郝俊杰
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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