How to make your own fixative:
The composition and content of each raw material in parts by weight is: 2 to 3 parts of phenolic resin, 1 to 1.5 parts of concentrated sulfuric acid, 1 ?2 parts of glacial acetic acid, 1?2 parts of 25% ammonia, 1?2 parts of ethylene glycol monobutyl ether and 1?2 parts of deionized water. The phenolic resin is first dissolved in glacial acetic acid, and then concentrated sulfuric acid is added to sulfonate the phenolic resin to generate a sulfonated phenolic resin. Finally, the reaction solution is neutralized with 25% ammonia in the formula proportion to prepare the color fixation for acid dye dyeing. agent.
Dye-fixing agent is one of the important auxiliaries in the printing and dyeing industry. With the development of science and technology, dyeing and finishing technology has also been significantly improved. Due to the expansion of international textile trade and people's living standards and environmental protection Increased awareness requires textiles to be comfortable, clean and safe.
Since Germany first launched the "Blue Angel" plan in the 1970s, some developed countries in the world (Japan, the United States, etc.) have successively passed and implemented relevant laws and regulations, stipulating various aspects of textiles. kind of indicator.
Green textiles require that in printing and dyeing processing, the use of dyeing materials that are carcinogenic, teratogenic, poorly biodegradable and certain aromatic amine intermediates specified in the regulations is prohibited, and the auxiliaries used are also required. It does not contain heavy metal ions and does not produce free formaldehyde, that is, it uses "green additives". The development and application of formaldehyde-free color fixing agent KS is in line with this requirement. The color fixing agent KS is obtained through the polymerization reaction of organic amines and epichlorohydrin, and then acidified with hydrochloric acid. It is used for reactive, direct, and sulfur dyes. The color fixation after dyeing cotton can "bridge" between the dye and the fiber to form a compound, that is, react with the dye molecules at the same time and cross-link with the cellulose fiber to form a highly diversified cross-linking system, making the dye and fiber more firmly combined. , prevent the dye from falling off the fiber and improve the dye fastness.
The active substances in the fixing agent can condense with each other to form a three-dimensional network film on the surface of the fiber, sealing the dye, increasing the smoothness of the cloth surface, reducing the friction coefficient and not being easy to wear, further preventing The dye swelling, dissolution, and shedding that occur during the wet rubbing process improve the wet rubbing fastness.