Acid-base neutralization of acetic acid in washing and dyeing industry and attention to its use

Acid-base neutralization of acetic acid in washing and dyeing industry and attention to its use

intro

The chemical name of acetic acid is acetic acid, chemical formula CH3COOH, and the content of 99% acetic acid is crystallized into ice shape below 16 ° C, also known as glacial acetic acid. Acetic acid is colorless, water-soluble, can be miscible with water in any proportion, volatile, is a weak organic acid.

As an organic acid, acetic acid is not only widely used in organic synthesis, organic chemical industry, food, medicine and other industries, but also used in washing and dyeing industry.

Application of acetic acid in washing and dyeing industry

01 Acid dissolving function of acetic acid in stain removal

Acetic acid as an organic vinegar, it can dissolve tannic acid, fruit acid and other organic acid characteristics, grass stains, juice stains (such as fruit sweat, melon juice, tomato juice, soft drink juice, etc.), medicine stains, chili oil and other stains, these stains contain organic vinegar ingredients, acetic acid as a stain remover, can remove the organic acid ingredients in the stains, as for the pigment ingredients in the stains, Then with oxidative bleaching treatment, all can be removed.

02

Acid-base neutralization of acetic acid in washing and dyeing industry

Acetic acid itself is weakly acidic and can be neutralized with bases.

(1) In chemical stain removal, the use of this property can remove alkaline stains, such as coffee stains, tea stains, and some drug stains.

(2) The neutralization of acetic acid and alkali can also restore the discoloration of clothes caused by the influence of alkali.

(3) The use of the weak acidity of acetic acid can also accelerate the bleaching reaction of some reduction bleach in the bleaching process, because some reduction bleach can accelerate the decomposition under vinegar conditions and release the bleaching factor, therefore, adjusting the PH value of the bleaching solution with acetic acid can accelerate the bleaching process.

(4) The acid of acetic acid is used to adjust the acid and alkali of the clothing fabric, and the clothing material is treated with acid, which can restore the soft state of the clothing material.

(5) Wool fiber fabric, in the ironing process, due to the ironing temperature is too high, resulting in damage to wool fiber, aurora phenomenon, with dilute acetic acid can restore wool fiber tissue, therefore, acetic acid can also deal with clothing due to ironing aurora phenomenon.

03

For water-soluble dyes containing hydroxyl and sulfonic acid groups, fiber fabrics with poor alkali resistance (such as silk, rayon, wool), under the condition of vinegar, it is conducive to the coloring and color fixing of the fibers.

Therefore, some clothes with poor alkaline resistance and easy fading in the washing process can be added to a small amount of acetic acid in the laundry detergent to fix the color of the clothes.

From this point of view, acetic acid is widely used in the washing and dyeing industry, but in the application process should also pay attention to the following matters.

For fabrics containing acetic acid fibers, when using acetic acid to remove stains, you should be extra careful to pay attention to the acetic acid concentration is not too high. This is because acetate fiber is made of wood, cotton wool and other cellulosic materials and acetic acid and acetate, poor resistance to vinegar, strong acid can degrade acetate fiber. When stains are placed on acetate fibers and fabrics containing acetate fibers, two points should be noted:

(1) The safe use concentration of acetic acid is 28%.

(2) Test drops should be made before use, do not heat when used, rinse immediately after use or neutralize with weak alkali.

Precautions for using acetic acid are as follows:

(1) Avoid contact with eyes, if contact with high concentration of fermented acid, immediately rinse with water.

(2) Contact with metal instruments should be avoided to produce corrosion.

(3) Drug interaction and alkaline drug compatibility can occur neutralization reaction and failure.

(4) Adverse reaction acetic acid is irritating, and it is corrosive to the skin and mucosa at high concentrations.