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Preparation method and application of terminated-type cation water-borne polyurethane color fixing agent

A water-based polyurethane and cationic technology, used in dyeing, textiles and papermaking, etc., can solve the problems of non-uniform dispersion and difficult reaction control, and achieve the effects of preventing hydrolysis, no effect on color, and increasing smoothness

Active Publication Date: 2010-09-08
溧阳常大技术转移中心有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this method, sodium bisulfite is used as the end-capping agent. Because sodium bisulfite is insoluble in organic solvents, it cannot be dispersed evenly in the polyurethane prepolymer, making the reaction difficult to control.

Method used

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  • Preparation method and application of terminated-type cation water-borne polyurethane color fixing agent

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Example 1: Under the operating conditions of the comparative example, the small molecule chain extender DEG was replaced with 0.44g of capping agent phenol (diluted with acetone to a mass fraction of 30%) and added to the system. After the capping reaction was complete, The amount of water added was 50.86g, and the theoretical solid content was 25.36%, and the light yellow transparent emulsion was obtained.

Embodiment 2

[0027]Example 2: Under the operating conditions of the comparative example, the theoretical R value of the prepolymer was adjusted to 1.58, and the small molecule chain extender DEG was replaced with 1.54g caprolactam (diluted to a mass fraction of 30% with acetone) and added Into the system, after the capping reaction is complete, add 46.27 g of water to obtain a light yellow translucent emulsion with a theoretical solid content of 28.35%.

Embodiment 3

[0028] Example 3: Under the operating conditions of the comparative example, the theoretical R value of the prepolymer was adjusted to 1.72, and the small molecule chain extender DEG was replaced with 1.63g end-capping agent methyl ethyl ketone oxime (diluted to a mass fraction of 30% with NMP) After adding to the system, the temperature of the water bath was raised to 80°C. After the end-capping reaction was complete, the amount of water added was 44.32g, and a light yellow transparent emulsion with a theoretical solid content of 32.68% was obtained.

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Abstract

The invention relates to a preparation method of a terminated-type cation water-borne polyurethane color fixing agent, belonging to the field of organic adhesives. The terminated-type cation water-borne polyurethane color fixing agent with solid content of 20-40% of and transparent or translucent yellowish appearance can be prepared by the following steps of: (1) polyurethane prepolymer reaction, (2) terminated reaction, and (3) acid neutralization and ionization reactions. In the invention, partial terminating after prepolymerization is adopted, a small number of isocyanate groups is inactivated and a self-emulsifying method is adopted to synthesize the water-borne polyurethane color fixing agent; in the color fixing process, closed active groups are released through baking at high temperature and are carried out crosslinking reaction with hydroxyl and amino groups on textile fabrics and reactive dyes so that the color fastness to washing of the textile fabric is improved.

Description

technical field [0001] The invention belongs to the field of organic adhesives, and relates to a preparation method and application of a blocked cationic water-based polyurethane color fixing agent Background technique [0002] Since many commonly used dye molecules contain water-soluble groups such as sulfonic acid groups or carboxylic acid groups, their color fastness, especially the color fastness to washing, is poor, and post-fixation treatment is required. During the color fixing process, the color fixing agent can form an insoluble salt with the dye molecule, thereby reducing the solubility of the dye in water, improving water resistance and wet rubbing fastness; at the same time, it can be used as a special adhesive to form a film on the surface of the dye and fabric to prevent dye Contact with water, sweat, etc.; even react with active groups on dyes and fibers to form strong forces such as covalent bonds, complexation or hydrogen bonds, so as to achieve color fixing...

Claims

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Application Information

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IPC IPC(8): C08G18/67C08G18/32C08G18/30C08G18/12D06P5/08
Inventor 杜郢周春利顿全秀时龙生张亮亮
Owner 溧阳常大技术转移中心有限公司
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