A kind of preparation method of neutralizing acid for reactive dye printing washing

Abstract

The invention discloses a preparation method of neutralizing acid for washing with reactive dyes. The method comprises: adding 160-170 parts of water and 150-155 parts of maleic anhydride to the reaction kettle, heating up, and after the maleic anhydride is completely dissolved, adding 182-188 parts of acrylic acid and 168-173 parts of itaconic acid, and stirring evenly , get the first mixture, put it into the dripping tank for use; add 80-100 parts of water, 40-45 parts of the first mixture, and 80-100 parts of ethanol to the reaction kettle, stir and heat up to 78-80 ℃, add persulfuric acid The sodium aqueous solution B is heated to 95-97 ℃ with stirring, and the reaction is carried out for 20-25min; the first mixture and the sodium persulfate aqueous solution A are simultaneously added dropwise to the reaction kettle, and the stirring is carried out while dropping, and the dropwise addition is completed in 3-5 hours; The reaction is incubated at 95-97°C for 40-50min, cooled to 20-50°C, and filtered to obtain a neutralizing acid for washing with reactive dyes. It is mainly used to neutralize alkali residues in textile fibers. Compared with the neutralized acid in the current market, it has good fiber strength, good printing fastness of reactive dyes, soft hand feel, no irritating odor, non-toxic and harmless, and is an environmentally friendly product.

Description

technical field [0001] The invention relates to the field of industrial neutralizing acid, in particular to a method for preparing a neutralizing acid for washing with reactive dyes, and the application of the prepared neutralizing acid for washing with reactive dyes in neutralizing alkali remaining in fabric fibers. Background technique [0002] Reactive dye printing products are bright in color and soft to the touch, but the technological process of reactive dye printing is long, and each process is very important. Moreover, about 3% of small soda needs to be added to the reactive dye printing paste, and the washing is also carried out in an alkaline environment, so the alkali in the printing fiber is very strong, and it must be cleaned up to reach a neutral or weakly acidic pH suitable for the human body. The value is 5.5-7.0, which is used to neutralize the acid. Nowadays, everyone on the market is using one or a mixture of organic acids such as acetic acid, citric acid...

AI Technical Summary

Problems solved by technology

[0005] For this reason, the present invention provides a kind of preparation method of reactive dyestuff printing washing with neutralizing acid, to solve the problem that the acid in the prior art is easy to volatilize, easy to remain, local acidity is too strong to reduce the strength of cotton fiber, affect the fastness of printing and dyeing printing and Hand feeling and other issues

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