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Dyeing method of aromatic polyamide fiber

A technology of aromatic polyamide and polyamide fiber, which is applied in the direction of dyeing method, fiber type, fiber treatment, etc., can solve the problems of difficult dyeing, achieve improved dyeing fastness, good deep dyeing, and increase K/S value Effect

Inactive Publication Date: 2012-07-18
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 the macromolecules of the aramid fiber, the tight fiber structure, the strong hydrophobicity of the fiber, 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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  • Dyeing method of aromatic polyamide fiber

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] 1. Pretreatment: Treat the aramid fiber in a treatment solution of 10g / L sodium hydroxide and a liquor ratio of 1:50 at 100°C for 30 minutes, and then wash it with water.

[0021] 2. Dyeing: dye the pretreated aromatic polyamide fibers with cationic dyes, the dyeing process prescription is: carrier CINDYE DNK dosage 15%owf, dye MAXILON Blue SL dosage 5%owf, sodium nitrate dosage 10g / L, pH= 3. The bath ratio is 1:30. (2) Dyeing process conditions: add carrier, sodium nitrate and dye at room temperature, adjust the pH value with formic acid, raise the temperature to 135°C at 1°C / min, keep it warm for 60 minutes, then cool down to 70°C at 1°C / min, drain the bath , washed with water. Then measure the K / S value and color fastness of the dyed fiber.

[0022] The test results of fibers treated with sodium hydroxide were compared with those of fibers not treated with sodium hydroxide, as shown in Table 1.

[0023] Table 1. Comparison of K / S value and color fastness of fibers...

Embodiment 2

[0027] Example 2: Effect of carrier CINDYE DNK dosage on K / S value.

[0028] In the dye liquor with a dyestuff MAXILON Blue SL concentration of 5% owf, an amount of sodium nitrate of 10g / L, pH=3, a bath ratio of 1:30, and a carrier CINDYE DNK amount of 0-20% owf, other process conditions are as in Example 1, for The aramid fibers pretreated with sodium hydroxide were dyed respectively, and then the K / S value of the dyed samples was measured, and the statistical results are shown in Table 2.

[0029] Table 2. Effect of carrier CINDYE DNK dosage on K / S value.

[0030] Carrier CINDYE DNK dosage / %owf K / S value 0 19.147 5 20.724 10 21.431 15 22.357 20 22.518

[0031] .

[0032] It can be seen from Table 2 that the K / S value of the dyed sample increases significantly after the carrier is added to the dyeing bath. This is because: the carrier plasticizes the fiber, increases the mobility of the fiber macromolecular chain, and relaxes the fib...

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Abstract

The invention discloses a dyeing method of an aromatic polyamide fiber, belonging to the technical field of fiber dyeing. The dyeing method of the aromatic polyamide fiber is characterized by comprising the following steps: carrying out pre-treatment on the aromatic polyamide fiber by using sodium hydroxide to hydrolyze the tail end anhydride of the molecule of the aromatic polyamide fiber into a carboxyl group; and increasing dyeing seats and dyeing the pre-treated aromatic polyamide fiber with a cationic dye. According to the dyeing method of the aromatic polyamide fiber, disclosed by the invention, the aromatic polyamide fiber is pre-treated with sodium hydroxide which serves as an alkaline agent so that the dyeing seats for dyeing fibers are increased on the cationic dye, so that cations on dye molecules can be in ionic bond combination with the carboxyl group generated by hydrolyzing the tail end anhydride of the fiber molecule, so that the deep dyeing and the color fastness are improved.

Description

Technical field: [0001] The invention belongs to the field of light chemical industry, and relates to a method for dyeing aromatic polyamide fibers, specifically a method of pretreating aromatic polyamide fibers with sodium hydroxide to make the terminal anhydrides of aromatic polyamide fiber molecules It is hydrolyzed into carboxyl groups, increasing the dye base, and then dyeing it with cationic dyes. Background technique: [0002] Aramid 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] How...

Claims

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Application Information

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IPC IPC(8): D06P3/24D06P1/00D06P5/22D06P1/673D06M11/38D06M101/36
Inventor 刘艳春白刚
Owner SHAOXING UNIVERSITY
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