Method for improving polyimide fiber basic dyeing performance

A polyimide fiber, basic dye technology, applied in the direction of dyeing method, fiber treatment, fiber type, etc., can solve the problem of difficulty in dyeing, and achieve the improvement of deep dyeing, good deep dyeing, and dyeing percentage. improved effect

Inactive Publication Date: 2016-05-11
SHAOXING UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, due to the regular arrangement of polyimide fiber macromolecules, tight fiber structure, strong fiber hydrophobicity, and the inherent yellow color of the fiber itself, it is very difficult to dye, which limits its application.

Method used

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  • Method for improving polyimide fiber basic dyeing performance
  • Method for improving polyimide fiber basic dyeing performance

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The polyimide fibers were treated with 10g / L alkaline catalyst (potassium hydroxide, sodium hydroxide) and a bath ratio of 1:50 at 70°C for 30 minutes, and washed with water. Then dye the fibers before and after treatment with basic dyes. The dyeing process prescription is: the amount of carrier CINDYEDNK is 15% owf, the amount of dye MAXILON Blue SL is 5% owf, the amount of sodium nitrate is 10g / L, pH=3, liquor ratio 1:30. Process conditions: add carrier, sodium nitrate and dye at room temperature, adjust the pH value with formic acid, heat up to 140°C at 1°C / min, keep warm for 60 minutes, then cool down to 70°C at 1°C / min, drain the bath, and wash with water. Then measure the K / S value and color fastness of the dyed fiber, and the results are shown in Table 1.

[0024] Table 1 K / S value and color fastness of fibers before and after carboxylation modification in the presence of basic catalyst

[0025]

[0026] It can be seen from Table 1 that under alkaline conditi...

Embodiment 2

[0028] The polyimide fibers were treated in 10g / L acid catalyst (acetic acid, sulfuric acid) and the treatment solution with a bath ratio of 1:50 at 70°C for 10min, and washed with water. Then dye the fibers before and after treatment with basic dyes. The dyeing process prescription is: the amount of carrier CINDYEDNK is 15% owf, the amount of dye MAXILON Blue SL is 5% owf, the amount of sodium nitrate is 10g / L, pH=3, liquor ratio 1:30. Process conditions: add carrier, sodium nitrate and dye at room temperature, adjust the pH value with formic acid, heat up to 140°C at 1°C / min, keep warm for 60 minutes, then cool down to 70°C at 1°C / min, drain the bath, and wash with water. Then measure the K / S value and color fastness of the dyed fiber, and the results are shown in Table 2.

[0029] K / S value and color fastness of fiber before and after carboxylation modification in the presence of acidic catalyst in table 2

[0030]

[0031] It can be seen from Table 2 that under acidic ...

Embodiment 3

[0033] Effect of Carrier CINDYEDNK Dosage on K / S Value

[0034] In the dye liquor with the dye MAXILON Blue SL concentration 5% owf, sodium nitrate dosage 10g / L, pH=3, liquor ratio 1:30, and carrier CINDYEDNK dosage 0-20%owf, the carboxylation was modified according to the dyeing process conditions in Example 1 After the polyimide fiber was dyed, the K / S value of the dyed sample was measured, and the results are shown in Table 3.

[0035] Table 3 The influence of carrier CINDYEDNK dosage on K / S value

[0036] Carrier CINDYE DNK dosage / %owf K / S 0 19.247 5 20.814 10 21.532 15 22.451 20 22.603

[0037] It can be seen from Table 3 that the K / S value of the dyed sample increases after the carrier is added to the dyeing bath. The carrier plasticizes the fiber, increases the mobility of the fiber macromolecular chain, and relaxes the fiber structure, thereby increasing the free volume of the fiber and increasing the diffusion rate of the dye...

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Abstract

The invention belongs to the field of light chemical industry and relates to a method for improving the dyeing performance of polyimide fiber basic dyes. That is, under the action of a catalyst, the polyimide fiber is modified by carboxylation, and then the carboxylated polyimide fiber is dyed by adding a carrier in the basic dyeing bath. Under the action of the catalyst, the terminal anhydrides of the polyimide fiber molecules are hydrolyzed into carboxyl groups, which can increase the dyeing seat, and the cations on the dye molecules can be ionically bonded with the carboxyl groups generated by the hydrolysis of the fiber molecule terminal anhydrides. The method of the present invention can effectively improve the Deep dyeing and color fastness of polyimide fiber dyed with basic dyes.

Description

technical field [0001] The invention belongs to the field of light chemical industry and relates to a method for improving the dyeing performance of polyimide fiber basic dyes. Background technique [0002] Polyimide fiber has excellent heat resistance, dielectric properties, low temperature resistance, mechanical properties, and radiation resistance, making it widely used in aerospace, electrical insulation, atomic energy industry, national defense construction, environmental industry, protection industry, medical It is widely used in fields with very harsh conditions such as sanitation, such as filtration of high temperature, radioactive or organic gases or liquids, fire-proof blankets, fire-resistant and flame-retardant clothing, etc. [0003] However, due to the regular arrangement of polyimide fiber macromolecules, tight fiber structure, strong fiber hydrophobicity, and the inherent yellow color of the fiber itself, it is very difficult to dye, which limits its applicat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D06M11/38D06M13/188D06M11/55D06P1/41D06P1/44D06P1/673D06P3/02D06M101/30
Inventor 白刚刘艳春钱红飞
Owner SHAOXING UNIVERSITY
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