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Method for bleaching cotton fabrics with high whiteness effects

A technology of high whiteness, cotton fabrics, applied in the field of high whiteness bleaching of cotton fabrics, can solve the problems of loss of bleaching effect and fiber degradation, and achieve the effect of improving bleaching efficiency, soft hand feeling, and high whiteness requirements.

Inactive Publication Date: 2016-12-14
SHAOXING UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Certain minerals such as inorganic salts and iron oxides can also cause hydrogen peroxide to decompose ineffectively and lose its bleaching effect. The oxygen generated by ineffective decomposition will cause fiber degradation under high temperature and alkaline conditions

Method used

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  • Method for bleaching cotton fabrics with high whiteness effects
  • Method for bleaching cotton fabrics with high whiteness effects
  • Method for bleaching cotton fabrics with high whiteness effects

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Embodiment 1: The influence of the type of acid agent on the bleaching performance of cotton fabric.

[0022] A kind of bleaching method of cotton fabric, first adopts mineral acid to process scoured cotton fabric, then adopts hydrogen peroxide to bleach, and the steps are as follows:

[0023] Step a. The mineral acid treatment process is: (hydrochloric acid or sulfuric acid) 6mL / L, bath ratio 1:30, 90°C, 6min.

[0024] Step b. The hydrogen peroxide bleaching process is: hydrogen peroxide 6g / L, water glass 5g / L, trisodium phosphate 1g / L, liquor ratio 1:30, pH=10.5, 100°C, 40min.

[0025] Using the above process, test its impact on the bleaching performance of cotton fabrics, as shown in Table 1.

[0026] Table 1. The effect of acid agent types on the bleaching performance of cotton fabrics.

[0027]

[0028] It can be seen from Table 1 that increasing the acid pretreatment before the hydrogen peroxide bleaching process can effectively improve the whiteness of the b...

Embodiment 2

[0029] Example 2: Effect of hydrochloric acid pretreatment on cotton fabric bleaching performance.

[0030] A kind of bleaching method of cotton fabric, first adopts hydrochloric acid to carry out pretreatment to boiled cotton fabric, then adopts hydrogen peroxide to bleach, and the steps are as follows:

[0031] Step a. The hydrochloric acid pretreatment process is: hydrochloric acid 6mL / L, bath ratio 1:30, 90°C, 6min.

[0032] Step b. The hydrogen peroxide bleaching process is: hydrogen peroxide 6g / L, water glass 5g / L, trisodium phosphate 1g / L, liquor ratio 1:30, pH=10.5, 100°C, 40min.

[0033] Using the above process, test its impact on the bleaching performance of cotton fabrics, as shown in Table 2.

[0034] Table 2. The effect of hydrochloric acid pretreatment on the bleaching performance of cotton fabrics.

[0035]

[0036] It can be seen from Table 2 that adding acid treatment before the hydrogen peroxide bleaching process can effectively improve the whiteness of ...

Embodiment 3

[0037] Embodiment 3: the influence of the amount of hydrochloric acid on the bleaching performance of cotton fabrics.

[0038] A kind of bleaching method of cotton fabric, first adopts hydrochloric acid to process scoured cotton fabric, then adopts hydrogen peroxide to bleach, and the steps are as follows:

[0039] Step a. The hydrochloric acid pretreatment process is: hydrochloric acid 4-8mL / L, bath ratio 1:30, 90°C, 6min.

[0040] Step b. The hydrogen peroxide bleaching process is: hydrogen peroxide 6g / L, water glass 5g / L, trisodium phosphate 1g / L, liquor ratio 1:30, pH=10.5, 100°C, 40min.

[0041] Using the above process, adjust the dosage of hydrochloric acid, and test its effect on the properties of bleached cotton fabrics, as shown in Table 3.

[0042] Table 3. The effect of hydrochloric acid dosage on the properties of bleached cotton fabrics.

[0043]

[0044]

[0045] It can be seen from Table 3 that as the amount of hydrochloric acid increases, the whiteness ...

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Abstract

The invention discloses a method for bleaching cotton fabrics with high whiteness effects. The method is characterized in that inorganic acid is used for treating cotton fabrics; inorganic salts and mineral matters which cause ineffective decomposition of hydrogen peroxide are removed; hydrogen peroxide is used for carrying out bleaching treatment; natural pigments in cotton fibers are removed, so that the cotton fabrics have high-whiteness bleaching effects and good strength.

Description

Technical field: [0001] The invention relates to a method for bleaching cotton fabrics with high whiteness, in particular to a processing method in which cotton fabrics are pretreated with an acid agent and then bleached with hydrogen peroxide. Background technique: [0002] In addition to 90%-94% cellulose, cotton fiber also contains natural impurities such as pectin, wax, cottonseed hulls, nitrogenous substances, ash, and pigments. The existence of these impurities makes the fabric poor in water absorption, rough in hand, and yellow in color, which has a great impact on the subsequent dyeing and finishing process. [0003] The purpose of bleaching is to remove natural pigments and impart the necessary and stable whiteness to cotton fabrics. There are two types of bleaching agents, reducing and oxidizing, and hydrogen peroxide is the most widely used. In addition to damaging the pigment, hydrogen peroxide also damages the cellulose during the bleaching process. Certain s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D06L3/02D06M11/11D06M101/06
CPCD06M11/11D06M2101/06D06M2200/50
Inventor 刘艳春白刚
Owner SHAOXING UNIVERSITY
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