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A continuous defoaming device and method for high-viscosity spinning solution

A spinning solution, high viscosity technology, applied in the direction of foam dispersion/prevention, etc., can solve the problems of long waiting time for bubble burst, low efficiency, and inability to continuously defoam

Active Publication Date: 2021-03-23
HENAN SHENMA NYLON CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if a single vacuum is used for defoaming, the settling tank is evacuated and the air pressure is maintained for a certain period of time. The air bubbles rise above the liquid level under the action of the pressure difference. Low

Method used

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  • A continuous defoaming device and method for high-viscosity spinning solution
  • A continuous defoaming device and method for high-viscosity spinning solution
  • A continuous defoaming device and method for high-viscosity spinning solution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Utilize the above-mentioned high-viscosity spinning solution continuous defoaming device to carry out the method for continuous defoaming, comprise the steps:

[0038] (1) Install a vacuum gauge in the vacuum gauge mounting hole 19, install a pressure gauge in the pressure gauge mounting hole 8, install a stirring motor in the stirring motor mounting hole 5 to drive and control the rotation speed of the stirring shaft 9, and open the water inlet 17 and the water outlet 18 , the temperature is set to 85°C; vacuumize the tank through the vacuum port 7, observe and make the vacuum gauge pressure at -0.095MPa, start the stirring shaft 9 and adjust the speed to 10 rpm;

[0039] (2) After the qualified material is prepared by the twin-screw extruder, the initial spinning solution with bubbles is pushed by the first metering pump 24 and enters the defoaming equipment through the feed port 4 and the flat mouth-shaped inlet 14. The spinning solution is evenly dropped on the firs...

Embodiment 2

[0046] The method of continuous defoaming using the above-mentioned high-viscosity spinning dope continuous defoaming device is different from Example 1 in step (6), observing that the liquid level of the second round tank body 21 in the defoaming tank is displayed at 90 Between % and 100%, open the bottom outlet 13, start the second metering pump 25 to transport to the filter device to filter impurities for use in the subsequent spinning unit, and this process takes about 1 hour.

[0047] Adopting the present invention can obtain the qualified spinning solution that the viscosity after defoaming is 5.1dL / g, the strength is 20.0CN / dtex and the modulus is 80.1Gpa, but the slight degradation of the material in the subsequent spinning unit affects the traction Stretch effect. Compared with Example 1, it is found that the present invention requires strict control of the residence time and temperature changes of the spinning solution in the device, so as to improve the continuous d...

Embodiment 3

[0049] The method of continuous defoaming using the above-mentioned high-viscosity spinning solution continuous defoaming device is different from Example 1 in step (6), observing the liquid level of the defoaming tank at the top position of the tapered transition part 3, Open the bottom discharge port 13, start the second metering pump 25 to deliver to the filter device to filter impurities for use by the subsequent spinning unit, and this process takes about 1.5 hours.

[0050] Adopting the present invention can obtain the qualified spinning solution that the viscosity after defoaming is 5.1dL / g, the strength is 20.0CN / dtex and the modulus is 77.7Gpa, but in the subsequent spinning unit, due to the degradation of the material, the traction and stretching are affected and performance. Compared with Example 1, it is found that the present invention requires strict control of the residence time and temperature changes of the spinning solution in the device, so as to improve the...

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Abstract

The invention relates to a high-viscosity spinning solution continuous defoaming device and method. The device comprises a defoaming tank, a feeding port of the defoaming tank is connected with a first pipeline, a first metering pump is arranged on the first pipeline, a discharging port is connected with a second pipeline, a second metering pump is arranged on the second pipeline, the defoaming tank comprises a first round tank body, a conical transition portion and a second round tank body which are arranged from top to bottom, the first round tank body is connected with the second round tankbody through the conical transition portion, a seal head is arranged at the top of the first round tank body, the feeding port, a tank top observation port and a vacuum orifice are formed in the sealhead, a discharging pipeline is arranged at the bottom of the second round tank body, a discharging port is formed in the lower portion of the discharging pipeline, a stirring shaft is arranged at the top of the first round tank body, extends downwards and extends into the bottom of the second round tank body, a primary deforming umbrella and a double-layer opposite umbrella-shaped thin plate arearranged on the stirring shaft positioned in the first round tank body, and a biconical helical ribbon is arranged on the stirring shaft positioned in the second round tank body.

Description

technical field [0001] The invention belongs to the field of high-viscosity liquid spinning, and in particular relates to a continuous defoaming device and method for high-viscosity spinning liquid. Background technique [0002] For high-viscosity fluids (such as the production of carbon fiber, aramid 1414, etc.), the viscosity of the spinning solution is as high as 200-500Pa·S. The high-viscosity spinning solution degassing technology is very important in the fiber production process. This causes abnormalities such as nozzles and wool, and the spinning solution is easily degraded after long-term degassing, which directly affects the performance and appearance of the tow product. For high viscosity spinning liquid degassing equipment, the requirements are higher. The existing vacuum static degassing method has a single form. Because the viscosity of the spinning liquid is too high, the air bubbles rise above the liquid surface by the buoyancy of the air bubbles in a vacuum s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D19/02
Inventor 史红军赵铎张文广潘强郑淑昀闫晓东李晓峰陈聚良陈桂昌欧玲魏建毅赵辉孙浩杰董菲菲梁海军罗亚利晋卫国袁中良冯立伟尹胜利郑应山屈建海胡忠朴陈聪段文蕊
Owner HENAN SHENMA NYLON CHEM