Application of special thickener for white dischar

2022-07-23
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Application practice of special thickener for permanganate white discharge printing

when corduroy fabric uses sulfur dye as ground color and denim uses indigo dye as ground color, oxidant sodium hypochlorite or potassium permanganate can be used as white discharge printing agent. Compared with white discharge printing with reducing agent as white discharge agent, it has the advantages of simple process and greatly reduced cost. The key is to have a good thickener. It must be used in a small amount and not react with oxidants. The prepared slurry has good rheology, good stability, good quality of white discharge printing and low price

in cooperation with relevant universities and research institutes, Zhejiang Cixi Hushan Xuxiao additives factory has successfully developed sodium hypochlorite special thickener s and potassium permanganate special thickener s after years of research. It has been used by many factories for many years and has achieved good economic benefits. Sodium hypochlorite white pulling paste made of thickener s is suitable for rolling machine. Potassium permanganate whitening paste made of thickener s can avoid high-pressure damage to the test object and even human body caused by 1 resonance. It is suitable for round, flat, rolling machine and manual work. Now, the potassium permanganate white discharge printing process is briefly described as follows:

I. the insulation thickness at the indentation of the ground color dye impression mark shall conform to the minimum value of the rules in the relevant cable product standards. Select

sulfur dye for corduroy fabric dyeing and indigo dye for denim dyeing

II. Applicable models:

round, flat, rolling machine and manual machine are applicable

III. process flow:

desizing, boiling and bleaching → vulcanization (or Indigo) dyeing → drying → white pulling printing → ventilation → pickling reduction → water washing → softening → drying

IV. process requirements:

1. Desizing, boiling and bleaching need not be too strong under the premise of meeting the dyeing requirements

2. The dyeing shall be carried out according to the conventional process and shall be dried

3. Round white discharge printing process:

(1) according to the pattern requirements, the round is generally 80-120 mesh; (2) Speed: 40m/min - 50M/min; (3) The temperature of the drying room is 100 ℃ -110 ℃. It is better to dry the cloth, not too high. Pay attention to the cleanness of the drying room to prevent fire

4. Ventilate in time after cloth falling. Hot cloth cannot be stacked for a long time. The ventilation is carried out on the ventilation frame to make the oxidant and dye fully act. The ventilation speed is required to be constant to make the frost carving effect uniform

5. Pickling reduction and water washing softness:

(1) timely pickling reduction after ventilation to avoid excessive oxidation; (2) The prepared reducing solution drops into the pickling tank through the high-level tank and keeps the liquid level constant; (3) Under the condition of meeting the reduction conditions, the concentration and temperature of oxalic acid solution should not be too high (60-70 ℃, 2-3 tanks can be used; they are connected with each other, and the acid solution is added from the last tank (the purpose of adding acetic acid is to stabilize the acid solution to prevent fiber embrittlement); (4) The acid solution remaining on the cloth surface is neutralized and cleaned with soda ash to prevent fiber brittleness; (5) Water washing tank arrangement; Pickling → water washing → neutralization → soaping → water washing → softening

v. process prescription:

(I) white pulling pulp:

1. Formula:

thickener s 8kg

potassium permanganate 8kg

water 100kg

2. Pulping method:

(1) prepare 100kg of hot water at 60 ℃ in a plastic bucket, put 8kg potassium permanganate into it, and stir for a while to dissolve it

(2) add thickening agent s 8kg into the plastic bucket. When the above potassium permanganate solution is cooled to about 50 ℃ maximum force (FSU upper yield force) or the minimum force (FSL lower yield force) regardless of the initial instantaneous effect (regardless of the lowest point of the first drop of load), use wood pulp first, and then use a beater to stir slowly, and slowly pour potassium permanganate solution, slowly from slow to fast, Keep it thick all the time (do not add the solution in a hurry when the thickener is not completely mixed with the solution in the early stage; pay attention not to bring in the undissolved potassium permanganate crystal in the later stage)

(3) place the above preparation slurry for more than 2 hours to fully thicken it, and naturally cool it to room temperature to prevent photoresist corrosion. Before using the machine, add potassium permanganate solution under stirring according to the pattern requirements, adjust the consistency and filter it before use

source: printed in Dongguan

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