Acidic reduction cleaner

A cleaning agent and acidic technology, applied in the field of printing and dyeing auxiliaries, can solve the problems of waste of resources, cumbersome steps, strong damage to polyester, etc., and achieve the effect of saving pickling

Inactive Publication Date: 2010-09-29
何鹰
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the strong alkaline environment will damage the strength of polyester. After the reduction cleaning, it needs to be neutralized with acid. The steps are cumbersome and cause a certain waste of resources.

Method used

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Examples

Experimental program
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Embodiment Construction

[0007] 1.N, N'-diethylthiourea / (C 2 h 5 NH) 2 Synthesis of CS

[0008] Prepare 45Kg ethylamine / C 2 h 5 NH 2 , 38Kg carbon disulfide / CS 2 , 115Kg ether / (CH 3 ) 2 O.

[0009] In the airtight reaction kettle, first add 115Kg ether. Open stirrer, add 38Kg carbon disulfide. After stirring evenly, 45Kg of ethylamine was added. React at room temperature (20-25° C.) for 12 hours, and stop stirring. The reaction product is filtered through a filter device to obtain N,N'-diethylthiourea.

[0010] 2. Compounding of acid reduction cleaning agent

[0011] Prepare 75Kg N,N'-diethylthiourea, 12Kg AEO-9 / C 12 h 25 O(CH 2 CH 2 O) 9 H, 288Kg water.

[0012] In the reactor, add 288Kg of water, 12Kg of AEO-9, 75Kg of N,N'-diethylthiourea in turn, and stir until uniform to obtain an acidic reducing cleaning agent.

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PUM

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Abstract

The invention relates to a printing and dyeing assistant for carrying out reduction cleaning on dyed polyester fabrics under acidic condition. Ethylamine reacts with carbon disulfide to generate N,N'-diethyl thiourea, and the N,N'-diethyl thiourea is compounded with fatty alcohol-polyoxyethylene ether to form an acidic reduction cleaner. In the process of reduction cleaning, the N,N'-diethyl thiourea is quickly in contact with the floating color of disperse dyes attached to fabric surfaces under the assistance of the fatty alcohol-polyoxyethylene ether to reduce carbonyl groups, ether bonds and other structures into hydrophilic hydroxyl groups, so that the floating color can be dissolved into water to be cleaned. Residual dyes in a dye bath and the cleaned floating color can also be reduced by the N,N'-diethyl thiourea for losing the capacity of secondary staining. On the premise of ensuring the cleaning effect, the invention can omit the steps of acid cleaning, water cleaning and the like, and the cleaning process can be directly carried out without discharging residual liquid when the dyeing rate of dyes is higher.

Description

technical field [0001] The invention relates to a printing and dyeing auxiliary agent for reducing and cleaning dyed polyester fabrics under acidic conditions. Background technique [0002] Polyester is the most widely used synthetic fiber and is usually dyed with disperse dyes. Disperse dyes are non-polar small molecules with very low hydrophilicity, and it is impossible to wash off the floating color on the surface of polyester by conventional methods such as water washing. At present, sodium dithionite (sodium hydrosulfite) and other highly reducing substances are generally used to reduce the floating color on the surface under strong alkaline conditions, destroy the chromophoric groups of disperse dyes, and make them produce water-soluble groups , thus soluble in water and washed away by water. However, the strong alkaline environment will damage the strength of polyester. After the reduction cleaning, it needs to be neutralized with acid. The steps are cumbersome and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D06P5/08D06P5/06
Inventor 何鹰
Owner 何鹰
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