Method for bleaching fibers

Abstract

The invention relates to a method for bleaching fibers. The method is characterized in that: the fibers are bleached through an alkali bath with pH value of 8.0 to 14.0 formed by the following steps of: adding organic acid or / and derivative thereof into hydrogen peroxide solution, adding a catalyst for peracid generation so that the peroxides of the organic acid or / and the derivative thereof coexist in the bath, and adding a stabilizing agent of the alkali bath. By method, the problem that the stability of the treatment solution cannot be reached when only the hydrogen peroxide solution is used can be solved; by permeating the treatment solution into cloth and silk, non-uniform problem of common degree can be solved; rolling redundancy rate difference is allowed in pad dyeing; even if the coiled cloth roll is infrequently shaken in the placing process of the cloth roll, treatment spots are not produced, and the problem of fiber brittleness during long-time storage is nearly not produced.

Description

technical field

[0001] The present invention relates to the bleaching method of fiber, specifically, relate to the method that uses the solution that organic peracid coexists with hydrogen peroxide to carry out the method for bleaching fiber. Background technique

[0002] At present, in the field of fiber dyeing and processing, when cellulose fibers such as cotton, hemp, and staple fibers are bleached, the main methods used are as follows: soak the alkaline hydrogen peroxide solution in the fiber or use In the pad method, after applying a hydrogen peroxide solution, heat treatment is performed with a dye jigger, liquid flow machine, or continuous steam machine to perform bleaching.

[0003] As far as the dyeing process is concerned, the bleaching of the fibers is required regardless of the required chromaticity and color depth. Therefore, the bleaching process in the processing process accounts for a large proportion of energy consumption, and the rise in fuel costs is becom...

Examples

Embodiment 1

[0070] Pad-dye (three dips and three pads) the following solution on the raw fabric of 100% cotton cloth (for bleaching before dyeing), use a liquid manipulator to squeeze the liquid to reach a 100% excess rate, and wrap it with plastic cloth after rolling , placed at room temperature for 24 hours, then washed with hot water at 90-95°C for 10-20 minutes at a bath ratio of 1:10, and then washed in a 60°C bath of 1 g / L acetic acid at a bath ratio of 1:10 Neutralize by treating for 5 minutes, and then wash with hot water and normal temperature water to complete the bleaching process.

[0071]

[0072] Lactic acid 5g / L

[0073] Hydrogen peroxide solution (35%) 45g / L

[0074] Catalyst for peracid generation (Note 1) 5g / L

[0075] Sodium hydroxide (solid) 20g / L

[0076] Alkaline bath stabilizer (note 2) 40g / L

[0077] Soaking and scouring agent (Note 3) 20g / L

[0078] Oxidation Desizing Agent 25g / L

[0079] Chelating agent 2g / L

[0080] pH 12.5

Embodiment 2

[0082] Pad-dye (three dips and three pads) the following solution on the raw fabric of 100% cotton towel (for whitening treatment), use a liquid manipulator to squeeze the liquid to reach a 100% excess rate, and stack it on the transport vehicle Wrap it with plastic cloth and place it at room temperature for 48 hours, then wash it with hot water at 90-95°C for 10-20 minutes at a bath ratio of 1:10, and then wash it with 1 g / L acetic acid at a bath ratio of 1:10. Treatment in a 60° C. bath for 5 minutes was performed to neutralize, and then hot water washing and normal temperature water washing were performed to complete the bleaching treatment.

[0083]

[0084] Lactic acid 15g / L

[0085] Hydrogen peroxide solution (35%) 135g / L

[0086] Catalyst for peracid generation (Note 1) 15g / L

[0087] Sodium hydroxide (solid) 20g / L

[0088] Alkaline bath stabilizer (note 2) 40g / L

[0089] Soaking and scouring agent (Note 3) 30g / L

[0090] Oxidation Desizing Agent 25g / L

[0091] ...

Embodiment 3

[0094] Pad-dye the following solution (two dipping and two padding) on ​​the raw fabric of 100% cotton fabric (for bleaching before dyeing), use a liquid manipulator to squeeze the liquid to reach a 100% puffing rate, and stack it on the transport vehicle Wrap it with plastic cloth and place it at room temperature for 24 hours, then wash it with hot water at 90-95°C for 10-20 minutes (twice) with a bath ratio of 1:10, and then wash it at 1 g / The solution was neutralized by being treated in a 60° C. bath with L of acetic acid for 5 minutes, and then washed with hot water and washed with normal temperature water to complete the bleaching treatment.

[0095]

[0096] Lactic acid 5g / L

[0097] Hydrogen peroxide solution (35%) 45g / L

[0098] Catalyst for peracid generation (Note 1) 5g / L

[0099] Sodium hydroxide (solid) 20g / L

[0100] Alkaline bath stabilizer (note 2) 40g / L

[0101] Soaking and scouring agent (Note 3) 30g / L

[0102] Chelating agent 2g / L

[0103] pH 12.5

technical field

[0001] The present invention relates to the bleaching method of fiber, specifically, relate to the method that uses the solution that organic peracid coexists with hydrogen peroxide to carry out the method for bleaching fiber. Background technique

[0002] At present, in the field of fiber dyeing and processing, when cellulose fibers such as cotton, hemp, and staple fibers are bleached, the main methods used are as follows: soak the alkaline hydrogen peroxide solution in the fiber or use In the pad method, after applying a hydrogen peroxide solution, heat treatment is performed with a dye jigger, liquid flow machine, or continuous steam machine to perform bleaching.

[0003] As far as the dyeing process is concerned, the bleaching of the fibers is required regardless of the required chromaticity and color depth. Therefore, the bleaching process in the processing process accounts for a large proportion of energy consumption, and the rise in fuel costs is becom...

Examples

Embodiment 1

[0070] Pad-dye (three dips and three pads) the following solution on the raw fabric of 100% cotton cloth (for bleaching before dyeing), use a liquid manipulator to squeeze the liquid to reach a 100% excess rate, and wrap it with plastic cloth after rolling , placed at room temperature for 24 hours, then washed with hot water at 90-95°C for 10-20 minutes at a bath ratio of 1:10, and then washed in a 60°C bath of 1 g / L acetic acid at a bath ratio of 1:10 Neutralize by treating for 5 minutes, and then wash with hot water and normal temperature water to complete the bleaching process.

[0071]

[0072] Lactic acid 5g / L

[0073] Hydrogen peroxide solution (35%) 45g / L

[0074] Catalyst for peracid generation (Note 1) 5g / L

[0075] Sodium hydroxide (solid) 20g / L

[0076] Alkaline bath stabilizer (note 2) 40g / L

[0077] Soaking and scouring agent (Note 3) 20g / L

[0078] Oxidation Desizing Agent 25g / L

[0079] Chelating agent 2g / L

[0080] pH 12.5

Embodiment 2

[0082] Pad-dye (three dips and three pads) the following solution on the raw fabric of 100% cotton towel (for whitening treatment), use a liquid manipulator to squeeze the liquid to reach a 100% excess rate, and stack it on the transport vehicle Wrap it with plastic cloth and place it at room temperature for 48 hours, then wash it with hot water at 90-95°C for 10-20 minutes at a bath ratio of 1:10, and then wash it with 1 g / L acetic acid at a bath ratio of 1:10. Treatment in a 60° C. bath for 5 minutes was performed to neutralize, and then hot water washing and normal temperature water washing were performed to complete the bleaching treatment.

[0083]

[0084] Lactic acid 15g / L

[0085] Hydrogen peroxide solution (35%) 135g / L

[0086] Catalyst for peracid generation (Note 1) 15g / L

[0087] Sodium hydroxide (solid) 20g / L

[0088] Alkaline bath stabilizer (note 2) 40g / L

[0089] Soaking and scouring agent (Note 3) 30g / L

[0090] Oxidation Desizing Agent 25g / L

[0091] ...

Embodiment 3

[0094] Pad-dye the following solution (two dipping and two padding) on ​​the raw fabric of 100% cotton fabric (for bleaching before dyeing), use a liquid manipulator to squeeze the liquid to reach a 100% puffing rate, and stack it on the transport vehicle Wrap it with plastic cloth and place it at room temperature for 24 hours, then wash it with hot water at 90-95°C for 10-20 minutes (twice) with a bath ratio of 1:10, and then wash it at 1 g / The solution was neutralized by being treated in a 60° C. bath with L of acetic acid for 5 minutes, and then washed with hot water and washed with normal temperature water to complete the bleaching treatment.

[0095]

[0096] Lactic acid 5g / L

[0097] Hydrogen peroxide solution (35%) 45g / L

[0098] Catalyst for peracid generation (Note 1) 5g / L

[0099] Sodium hydroxide (solid) 20g / L

[0100] Alkaline bath stabilizer (note 2) 40g / L

[0101] Soaking and scouring agent (Note 3) 30g / L

[0102] Chelating agent 2g / L

[0103] pH 12.5

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