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Continuous defoaming device for high-viscosity fluid, application of continuous defoaming device and polyamide acid spinning solution defoaming method

A technology of polyamic acid and spinning solution, which is applied in spinning solution filtration, chemical instruments and methods, liquid degassing, etc., can solve the problems of long degassing time, shortened degassing time, and low degassing efficiency, and achieves Strengthen the defoaming effect, shorten the defoaming time, and improve the defoaming efficiency

Pending Publication Date: 2021-11-09
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to overcome the problems of long degassing time and low degassing efficiency caused by the high viscosity of polyamic acid spinning stock solution in the preparation process of polyimide fiber existing in the prior art, and to provide a method for high viscosity fluid The continuous defoaming device and the defoaming method of polyamic acid spinning solution, the continuous defoaming device for high-viscosity fluid can shorten the defoaming time and improve the defoaming efficiency, thereby realizing efficient continuous production and ensuring fiber performance stability

Method used

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  • Continuous defoaming device for high-viscosity fluid, application of continuous defoaming device and polyamide acid spinning solution defoaming method
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  • Continuous defoaming device for high-viscosity fluid, application of continuous defoaming device and polyamide acid spinning solution defoaming method

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Embodiment approach

[0055] According to a preferred embodiment of the present invention, the lower part of the degassing internal member tower 21 is connected to a plurality of the degassing internal member supports 22, and the plurality of degassing internal member supports 22 are along the The circumferential direction of the defoaming internal member tower body 21 is vertically arranged at intervals to form a ring structure, and each defoaming internal member support member 22 has a diameter of 0.1-15 mm, preferably 1-8 mm; a length of 50-1500 mm, preferably 200 mm. -750mm; the arrangement pitch is 1-80mm, preferably 5-30mm.

[0056] In a preferred embodiment of the present invention, the top of the defoaming internal member 2 is close to the distributor 5 at the center of the top of the defoaming device body 3 , and the bottom surface of the defoaming internal member support 22 is close to the collector-redistributor 6 . When the high-viscosity fluid is received into the body 3 of the degassi...

Embodiment 1

[0084] In an aprotic polar solvent, dianhydride and diamine are polymerized at low temperature to obtain a polyamic acid spinning stock solution with a viscosity of 20Pa·s;

[0085] The above-mentioned polyamic acid spinning stock solution is injected into the above-mentioned degassing device body 3 through the fluid injection port 1 and the distributor 5 of the continuous vacuum degassing kettle; the vacuum in the degassing device is started, and the vacuum degree is set to 100kPa;

[0086] The above-mentioned polyamic acid spinning stock solution is dispersed and flowed through the above-mentioned defoaming internal member 2 to form a film-like spinning liquid film, and vacuum degassing is completed to obtain a spinnable polyamic acid spinning stock solution; the cone angle of the defoaming internal member 2 150°, the distance between the bottom edge and the inner side wall of the defoaming device body 3 is 20mm, each defoaming internal component support 22 has a diameter of ...

Embodiment 2

[0094] In an aprotic polar solvent, dianhydride and diamine are polymerized at low temperature to obtain a polyamic acid spinning stock solution with a viscosity of 50 Pa·s;

[0095] The above-mentioned polyamic acid spinning stock solution is injected into the above-mentioned degassing device body 3 through the fluid injection port 1 and the distributor 5 of the continuous vacuum degassing kettle; the vacuum in the degassing device is started, and the vacuum degree is set to 100kPa;

[0096] The above-mentioned polyamic acid spinning stock solution is dispersed and flowed through the above-mentioned defoaming internal member 2 to form a film-like spinning liquid film, and vacuum degassing is completed to obtain a spinnable polyamic acid spinning stock solution; the cone angle of the defoaming internal member 2 150°, the distance between the bottom edge and the side wall of the degassing device body 3 is 20mm, the diameter of each degassing internal component support 22 is 1mm,...

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Abstract

The invention belongs to the technical field of preparation of high-performance fibers, and discloses a continuous defoaming device for high-viscosity fluid, application of the continuous defoaming device and a polyamide acid spinning solution defoaming method. The continuous defoaming device comprises a defoaming device body, a fluid injection opening formed in the top of the defoaming device body and a fluid discharge opening formed in the bottom of the defoaming device body. A plurality of stages of defoaming inner components with defoaming inner component supporting pieces are mounted in the defoaming device body, and a collecting-redistributing device is arranged between every two adjacent stages of defoaming inner components. The defoaming inner components disperse high-viscosity fluid injected into the defoaming device body to form a thin-film-shaped liquid film, so that the defoaming time is shortened, the defoaming efficiency is improved, efficient and continuous production is achieved, and the stability of fiber performance is guaranteed. The device is large in flux, simple to operate and large in operation elasticity, and can be widely applied to various fiber preparation processes and other chemical defoaming units.

Description

technical field [0001] The invention belongs to the technical field of high-performance fiber preparation, and in particular relates to a continuous defoaming device for high-viscosity fluid and its application, and a method for defoaming polyamic acid spinning solution in the preparation process of polyimide fibers. Background technique [0002] High-performance fibers refer to chemical fibers with special physical and chemical structures, properties and uses, or special functions. According to different properties, they can be divided into corrosion-resistant fibers, high-temperature-resistant fibers, high-strength and high-modulus fibers, and flame-resistant fibers. . Polyimide fiber is one of the important varieties of high-performance fibers, which has the characteristics of high strength, high modulus and high temperature resistance. According to theoretical calculations, the modulus of fibers synthesized from pyromellitic dianhydride (PMDA) and p-phenylenediamine (PP...

Claims

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Application Information

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IPC IPC(8): B01D19/00D01D1/10
CPCB01D19/0036B01D19/0078D01D1/103
Inventor 毕丰雷胡帅
Owner CHINA PETROLEUM & CHEM CORP
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