Desizing agent for production process in pretreatment of printing and dyeing and preparation method thereof

Abstract

The invention relates to a desizing agent for a production process in pretreatment of printing and dyeing and a preparation method thereof. The desizing agent comprises the following components by weight percent: 25% to 35% of alkali metal hydroxide, 5% to 10% of alkali metal phosphate, 5% to 10% of alkali metal silicate, 2% to 6% of alkaline-resistant penetrant and the balance of water. The preparation method of the desizing agent comprises the steps of: (1) adding the alkali metal phosphate and the alkali metal silicate to the water according to a formula; stirring at the temperature of 35 DEG C to 45 DEG C; then adding the alkali metal hydroxide; keeping the temperature and stirring for 1.5 to 2.5 hours; (2) adding the alkaline-resistant penetrant to the solution obtained in the step (1); stirring for 1.5 to 2.5 hours at the temperature of 60 DEG C to 70 DEG C; and cooling to prepare the desizing agent. The desizing agent has the advantages of complete desizing, small utilization quantity (which is only arounf 15% of the utilization quantity of traditional liquid caustic soda), convenient cleaning, low wastewater yield and small pollution, and reduces the printing and dyeing cost. The preparation method has the advantages of simple preparation technology, easy acquirement of raw material and low production cost.

Description

technical field [0001] The invention relates to a scouring desizing agent used in the production process of printing and dyeing pretreatment and a preparation method thereof. Background technique [0002] Desizing is the process of removing size from fabrics. The warp yarns of fabrics such as cotton, viscose and synthetic fibers are mostly sizing before weaving. The sizing will affect the wettability of the fabric during the dyeing and finishing process and hinder the contact of chemicals with the fibers. Therefore, the fabrics are generally desized first, and the desizing of cotton fabrics also removes some impurities in the fibers; synthetic fiber fabrics can sometimes be desized at the same time during the scouring process. The methods of desizing various fabrics vary with the size used in sizing, and the following four methods are commonly used: [0003] ①Hot water desizing method: After the fabric is soaked in hot water, it is kept in the desizing tank for more than t...

AI Technical Summary

Problems solved by technology

[0007] So far, due to the consideration of the cost of printing and dyeing, the industry mainly uses low-cost high-concentration liquid caustic soda, and desizing is carried out through the lye desizing method. However, high-concentration liquid caustic is a chemical raw material with high pollution and strong corrosion. Its desizing has the disadvantages of large amount of waste water, serious pollution and difficult treatment

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