Method for improving spinnability and after processing characteristic of polyimide fiber

A technology of polyimide fiber and processing characteristics, applied in fiber chemical characteristics, dry spinning method, fiber treatment, etc., can solve the problems of unfavorable fiber processing and application, decrease of interlocking strength, etc., and achieve improvement of spinnability and apparent viscosity The effect of falling and feeling good

Inactive Publication Date: 2011-11-16
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, due to the characteristics of the molecular structure of polyimide, the density of benzene rings in the main chain of the molecule is relatively large. Although this is beneficial to improving the mechanical properties and heat resistance of the fiber, this rigid chain molecule leads to a stronger rigidity of the fiber. , the brittleness increases, and the cohesion strength decreases, which is not conducive to the post-processing application of fibers, such as weaving, non-woven fabrics, etc.

Method used

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  • Method for improving spinnability and after processing characteristic of polyimide fiber
  • Method for improving spinnability and after processing characteristic of polyimide fiber
  • Method for improving spinnability and after processing characteristic of polyimide fiber

Examples

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Effect test

Embodiment 1

[0028] (1) Add 440 grams of 4,4'-diaminodiphenyl ether and 150 grams of 3,3'-diaminodiphenyl ether into 4000ml of dimethylacetamide, stir at 15°C until completely dissolved; after that, put 650g of pyromellitic dianhydride was added in batches to the solution, and stirred for 8 hours under nitrogen protection to obtain a light yellow viscous polyamic acid spinning solution with an intrinsic viscosity of 2.16dL / g;

[0029] (2) After degassing the polyamic acid spinning solution prepared above, dry spinning is carried out on a dry spinning machine, the length of the tunnel is 10 meters, and the upper section of the tunnel temperature is 170 ° C, the middle section is 200 ° C, and the lower section is 220 ° C. Afterwards, polyamic acid fibers are obtained by winding and forming; the number of spinneret holes used is 30 to 100 holes, and the hole diameter is 0.1mm;

[0030] (3) The polyamic acid fiber is made of polyimide fiber by thermal imidization, and the two-stage treatment t...

Embodiment 2

[0032] (1) Add 330 grams of 4,4'-diaminodiphenyl ether and 350 grams of 3,4'-diaminobenzophenone into 12000ml of dimethylformamide, stir at 20°C until completely dissolved; after that, 720 grams of pyromellitic dianhydride were added to the solution in batches, and stirred at room temperature for 10 hours to obtain a light yellow viscous polyamic acid spinning solution with an intrinsic viscosity of 1.89 dL / g;

[0033] (2) After degassing the polyamic acid spinning solution prepared above, dry spinning is carried out on a dry spinning machine, the length of the tunnel is 15 meters, the upper section of the tunnel temperature is 150 ° C, the middle section is 200 ° C, and the lower section is 210 ° C. Afterwards, the polyamic acid fiber is obtained by winding and forming;

[0034] (3) The polyamic acid fiber is made of polyimide fiber by thermal imidization, and the two-stage treatment temperature is 170°C and 330°C respectively; stretching 3 times at 350°C, the high-performanc...

Embodiment 3

[0036] (1) 350 grams of p-phenylenediamine is added in 12000ml dimethylformamide solvent, after that, 2080 grams of 3,3',4,4'-benzophenone tetracarboxylic dianhydride is added in the solution, in- Stir at 5°C for 6 hours, then add 600 grams of 3,3'-diaminodiphenyl ether into the solution, and stir for another 4 hours to obtain a light yellow viscous polyamic acid spinning solution;

[0037] (2) After degassing the polyamic acid spinning solution prepared above, dry spinning is carried out on a dry spinning machine, the length of the tunnel is 10 meters, and the upper section of the tunnel temperature is 170 ° C, the middle section is 210 ° C, and the lower section is 230 ° C. Afterwards, the polyamic acid fiber is obtained by winding and forming;

[0038] (3) The polyamic acid fiber is made of polyimide fiber by thermal imidization, and the two-stage treatment temperature is 170°C and 330°C respectively; stretching 3 times at 450°C, the high-performance polyimide fiber can be ...

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Abstract

The invention relates to a method for improving spinnability and an after processing characteristic of a polyimide fiber. The method comprises the following steps: (1) adding a dianhydride monomer and two diamines monomers into a solvent, and forming a terpolymerization polyamide acids solution at a temperature of -5-20 DEG C; (2) adopting dry method spinning formation to carry out deaeration on the above polyamide acids solution in vacuum, entering a spinning channel through a spinning assembly, and carrying out winding shaping on the channel to obtain a polyamide acids fiber; (3) subjectingthe obtained polyamide acids fiber to a heat treatment and a heat stretching treatment. The method of the present invention has the characteristics of simple operation and low cost. The obtained polyimide fiber has good spinnability, good mechanical property, and soft handfeel of fiber. Maneuverability of the fiber in downstream product processing like braiding and nonwoven operations is improved. The polyimide fiber of the present invention can be widely applied to production of a composite material reinforcing fiber, a reinforcing core, a filtering material of high temperature substance, aninsulating material and the like.

Description

technical field [0001] The invention belongs to the field of preparation of special synthetic fibers, in particular to a method for improving the spinnability and post-processing properties of polyimide fibers. Background technique [0002] As a class of high-performance fibers, polyimide fibers have good thermal stability, good mechanical properties, and low water absorption, and can be used in harsher environments. Polyimide fibers can be braided into ropes, woven into fabrics or made into non-woven fabrics, which are used in high temperature, radioactive or organic gas filtration, fire insulation blankets, fire-resistant and flame-retardant clothing, etc. [0003] The existing methods for preparing polyimide fibers generally include a one-step forming process, a two-step wet spinning process and a two-step dry process. One-step method is to use polyimide solution to directly spin to prepare polyimide fiber, such as Chinese invention patent ZL 02112048.X, U.S. patent US 4...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F6/78D01D1/10D01D5/04D01D10/02C08G73/10
Inventor 张清华赵陈嘉郭涛徐圆夏清明许千陈大俊
Owner DONGHUA UNIV
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