Auxiliary composition and application thereof for low-temperature one-bath scouring and bleaching process of cotton textiles

Abstract

The invention relates to an auxiliary agent composition used in a low temperature one-bath scouring and bleaching process for cotton textile and application thereof, belonging to the technical field of textile printing and dyeing. The auxiliary agent composition comprises, by weight, 10 to 15% of a hydrogen peroxide activator, 2 to 5% of low temperature activating catalyst sustained release capsule, 10 to 15% of a chelating agent, 30 to 40% of diatomite, 10 to 15% of a surfactant and 19 to 31% of a bulking agent. The invention also provides a low temperature one-bath scouring and bleaching process for cotton textile. The process comprises the steps of adding an effective amount of the auxiliary agent composition, hydrogen peroxide and caustic soda into cotton textile and carrying out scouring and bleaching at a temperature of 55 to 60 DEG C for 45 to 60 minutes. According to the invention, cooperative utilization of the auxiliary agent composition, hydrogen peroxide H2O2 and caustic soda enables the low temperature one-bath scouring and bleaching process in the invention to be realized and scouring and bleaching one-bath treatment at or below a temperature 60 DEG C to be carried out, and the effects of scouring and bleaching by using the process provided in the invention are identical with the whiteness and capillary effects of conventional high temperature alkali hydrogen peroxide one-bath process carried out at a temperature of 98 to 100 DEG C, or even at 130 DEG C.

Description

technical field [0001] The invention belongs to the technical field of textile printing and dyeing, and relates to an auxiliary composition used in a low-temperature one-bath bleaching process for cotton textiles and its application in the low-temperature one-bath bleaching process. Background technique [0002] Cotton textiles are composed of cotton fibers, which contain 0.4-1.2% pectin, 0.4-1.2% oil wax, 1.0-1.9% nitrogen-containing substances, 0.7-1.6% ash and a small amount of pigment and other natural Impurities (called commensals of the cotton fiber), and cotton seed hulls (called concomitants). The symbiosis mainly exists in the cuticle and primary rubber wall of cotton fibers. Their existence makes cotton fibers hydrophobic, affects water absorption, and hinders the penetration and diffusion of dyes in the dyeing process. The existence of cotton seed hulls affects the appearance of fabrics. Therefore, cotton textiles must be removed during the dyeing and bleaching p...

AI Technical Summary

Problems solved by technology

[0005] 1. The hydrogen peroxide steaming (or cooking) process needs to be treated at high temperature for more than 1 hour to complete the bleaching effect. Not only the energy consumption is high, but also the damage to the fiber is relatively large, and the breaking strength of the fabric is reduced by 15% or more. Cellulose fiber The degradation rate is as high as 40% to 50%, or even higher

For wool, linen, silk fabrics and their blended interwoven products that cannot be treated at high temperature for a long time, the problem is even more serious. The conventional hydrogen peroxide bleaching process is likely to cause serious damage to one component or insufficient bleaching of another component; Seriously restrict the development of multi-fiber fabrics and the technological innovation and high-grade of textile fabrics

[0006] 2. The hydrogen peroxide cold pad-batch process has shortcomings such as long stacking time (16-24h), poor product quality stability, and poor water absorption.

According to foreign patents, the minimum dosage is 2g / L to bleach at 80°C, and the manufacturer cannot bear such a high cost;

[0011] 2) Under the action of alkali, the peracetic acid produced by TAED is a hydrophilic activator, so it has a strong activation ability for the bleaching of some hydrophilic pigments, but for the bleaching of some hydrophobic pigments, it is Failed to achieve the desired effect, which greatly reduces its scope of application;

[0012] 3) Although TAED can reduce the bleaching temperature, it has also been proved that it has no beneficial effect on the fiber damage and fiber strength of some cellulose fibers, such as man-made fibers;

[0013] 4) The low temperature effect of TAED is not obvious

A higher temperature is required to promote the rate of perhydrolysis, and the bleaching-promoting performance can be effectively exerted at about 80°C, and it is not suitable for the bleaching process of fabrics at or below 60°C;

[0014] 5) The low solubility of TAED in water also limits its application in the textile industry

[0016] To sum up, the current conventional hydrogen peroxide bleaching process has the disadvantages of high energy consumption, great damage to fiber strength, and poor application conditions for multi-fiber fabrics. However, some newly researched activator new processes are still in the research and development stage, and the actual effect has not yet been industrialized. In conclusion, there are few successful commercialization, and only TAED is relatively successful in commercial application. However, TAED has high cost of use, low temperature effect is not obvious, poor bleaching effect on hydrophobic pigments, and the ideal activation temperature is 80°C. many deficiencies

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