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High-temperature-resistant polyurethane elastic fiber spinning control method

A polyurethane elasticity, spinning control technology, applied in the direction of stretch spinning, fiber processing, rayon manufacturing, etc., to achieve the effect of improved orientation and crystallinity, good structural consistency, and improved elastic properties

Active Publication Date: 2021-04-30
宁夏宁东泰和新材有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention proposes a high temperature resistant polyurethane elastic fiber spinning control method in order to solve the problems in the prior art when the high temperature resistant polyurethane elastic fiber stock solution is spun in a high temperature spinning tunnel

Method used

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preparation example Construction

[0037] The preparation method of the high-temperature-resistant polyurethane elastic fiber spinning stock solution in the embodiment of the present invention is according to the patent "a kind of spandex with good heat resistance and stability and its preparation method" (publication number: CN 111101230 A) that the applicant has applied for and disclosed Prepared by the method in, the specific steps are as follows:

[0038](1) Prepolymerization reaction: Mix polytetramethylene ether glycol (molecular weight: 1800) and 4,4'-diphenylmethane diisocyanate, react at 68°C for 120min, and then use N,N-dimethylethylene The amide is used as a solvent to fully dissolve the prepolymer, and the prepolymer solution is obtained after cooling;

[0039] (2) Polymerization reaction: transfer the prepolymer solution to the polymerization reactor, stir evenly, and install a cooling pipe on the outer plate of the polymerization reactor to control the temperature in the polymerization reactor, an...

Embodiment 1

[0048] High temperature resistant polyurethane elastic fiber spinning control method, the specific tunnel system control parameters are as follows:

[0049] The pressure of the delivery pipeline that transports the spinning dope to the spinning assembly is set to 8.0Mpa, the temperature of the delivery pipeline is set to 50°C, the hole of the spinning assembly is a circular cross-section, the cross-sectional diameter is 0.3mm, and the effective length is 1.2mm;

[0050] Set the temperature of the upper part of the corridor from the top of the corridor to 3.6m from the top of the corridor to 166°C, set the pressure of the air inlet at the upper part of the corridor to 850pa, set the pressure of the air outlet at the upper part of the corridor to 225Pa, and set the wind speed of the air inlet at the upper part of the corridor to 0.3m / s;

[0051] Set the temperature in the middle of the corridor from the position 3.6m from the top of the corridor to the position 6m from the top of...

Embodiment 2

[0058] High temperature resistant polyurethane elastic fiber spinning control method, the specific tunnel system control parameters are as follows:

[0059] The pressure of the delivery pipeline that transports the spinning dope to the spinning assembly is set to 8.0Mpa, the temperature of the delivery pipeline is set to 50°C, the hole of the spinning assembly is a circular cross-section, the cross-sectional diameter is 0.3mm, and the effective length is 1.2mm;

[0060] Set the temperature of the upper part of the tunnel from the top of the tunnel to 4m from the top of the tunnel to 171°C, set the pressure of the air inlet of the tunnel to 780pa, set the pressure of the air outlet of the tunnel to 195Pa, and set the wind speed of the air inlet to 0.2m / s;

[0061] Set the temperature in the middle of the corridor from 4m from the top of the corridor to 6.4m from the top of the corridor to 260°C, set the pressure of the air inlet of the corridor to 880pa, set the pressure of the ...

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Abstract

The invention provides a high-temperature-resistant polyurethane elastic fiber spinning control method. According to the method, the temperature of the upper portion of a channel is set to be slightly higher than the boiling point temperature of a spinning solution solvent; meanwhile, the relatively low air speed and the low air pressure are set, so that the solvent volatilization speed difference between the interiors of filaments and the surfaces of the filaments is relatively small, and the temperature of the middle of the spinning channel is set to be 250-270 DEG C; and meanwhile, the corresponding air speed and air pressure are set in a matched mode, the solvent diffused to the surfaces of the filaments from the interiors of the filaments is further volatilized, the temperature of the lower portion of the channel is set to be 20-30 DEG C lower than the temperature of the middle of the channel, the concentration of the solvent in the filaments is volatilized to the minimum, and finally the drafting speed of a drafting roller is set. The high-temperature-resistant polyurethane elastic fiber which is good in orientation, high in crystallinity and uniform in structural consistency can be obtained from the polyurethane elastic fiber filaments through spinning control conditions.

Description

technical field [0001] The invention relates to a method for controlling the spinning of polyurethane elastic fibers, in particular to a method for controlling the spinning of high-temperature resistant polyurethane elastic fibers. Background technique [0002] Polyurethane elastic fiber is a multi-block copolymer with alternating soft and hard segments. The soft segment in polyurethane elastic fiber is composed of polyester polyol or polyether polyol, and the hard segment is composed of isocyanate and small molecule chain extender. generate. Due to the alternating structure of soft and hard segments, the spandex fiber has the advantages of high breaking strength, high breaking elongation and good elastic recovery rate. [0003] In the preparation process of high temperature resistant polyurethane elastic fiber, the preparation process of polyurethane spinning dope affects the high temperature resistance, elastic properties and breaking strength of polyurethane elastic fibe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F6/94D01F1/10D01F11/08C08G18/75C08G18/66C08G18/48D01D1/00D01D5/16D01D4/00
CPCD01F6/94D01F1/10D01F11/08C08G18/755C08G18/6685C08G18/4854D01D1/00D01D5/16D01D4/00
Inventor 王超马永辉罗正龙牟元生李喜乐王恩庆
Owner 宁夏宁东泰和新材有限公司
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