On the basis of the existing synthesis of triethylenetetramine and epichlorohydrin, butyl acrylate was added. The reactive film forming agent can react with the three reactive groups in the same way, which can also play a role in the interaction of the fabric fixing agent. When the fabric is dyed, especially when it is dyed dark and thick, the color fixing effect is greatly improved by using the color fixing agent, especially the dry and wet rubbing fastness can be improved to more than grade 4, which meets the national standard, and the effect is not different from that of foreign color fixing agents, even better than that of foreign color fixing agents.
The above fixative is used only after the fabric is dyed. Hu Feiyan and others designed a cationic color fixing agent according to this idea. Similarly, with diethylenetriamine and epichlorohydrin as the main raw materials, different synthetic processes are used to synthesize cationic aldehyde free color fixing agent with slightly different properties. After fabric dyeing, it is used in combination. After the combination, its application effect is generally better than that of single color fixing agent, especially the problem of poor deep color fastness has been significantly improved.
Cationic aldehyde free color fixing agent uses the color fixing mechanism of “salt formation”. The most commonly used material in cationic color fixing agent is quaternary ammonium salt. The synthesis method of quaternary ammonium salt is to first react polyamine with epichlorohydrin, and then quaternize the synthesized solution to prepare cationic color fixing agent. In the research and development of this kind of color fixing agent, researchers often use different raw materials to develop new color fixing agent from the perspective of raw material selection, and explore its color fixing effect, but rarely explore various factors affecting the cationic strength of color fixing agent.
Hou Honghao and others consider the importance of this problem. They used diethylenetriamine, epichlorohydrin and 3-chloro-2-hydroxypropyl trimethylammonium chloride as the main raw materials to prepare a color fixing agent through two steps. According to the synthesis principle and properties of the color fixing agent, it was judged that the type of the color fixing agent belongs to cationic quaternization reaction type color fixing agent. By controlling the raw material ratio 2, reaction temperature, reaction time, pH of reaction environment and other conditions. In the process of synthesis, its cationic degree needs to be measured and recorded in order to see whether the reaction conditions have an impact on the cationic property of the synthesized color fixing agent, and further explore the influence law of the conditions. Through experiments, we can know that the synthesis of intermediates and reaction conditions in the reaction process have a great influence on the cationic degree of this kind of quaternary ammonium cationic fixing agent. Further data analysis shows that when the cation degree is greater than 1.50, the color fastness to dry, wet friction and brushing of the fabric has been significantly improved, even higher than the national standard. This study provides a good method and idea on how to improve the color fixing effect by improving the cationic degree of color fixing agent.
In a word, the color fixing agent synthesized with polyethylenepolyamine as raw material is mainly cationic color fixing agent or cationic reactive color fixing agent. When the fabric has color change, poor deep color fastness, poor dry and wet rubbing fastness and other problems, relevant researchers have provided effective solutions.
