Fixing agent is one of the important auxiliaries in printing and dyeing industry, which can improve the color fastness to wet treatment of dyes on fabrics. Insoluble colors can be formed with dyes on fabrics to improve the color fastness to washing and sweating, and sometimes improve the color fastness to lighting.
Commonly used dye fixing agents are cationic quaternary ammonium salts, such as cetylpyridine chloride, cetylpyridine bromide, propylene bis (hexadecyl dimethyl ammonium chloride); amine formaldehyde resin type dicyandiamide formaldehyde primary condensate (fixing agent Y, M); polyamine condensate (silk fixing agent LA); phenolic condensate (cross-linking fixing agent DE); cross-linking fixing agent (IndosCR); reactive dye fixing agent, and Phenolic sulfonic acid formaldehyde condensate used as fixing agent instead of tannin on nylon (polyamide) fabrics, etc.
Third, fixing mechanism
Fixing mechanism: A polyaminedyeing fixing agentself-condensation form film, which is impregnated in solution, and the fixing agent molecules adhere to the fabric. When the fabric is treated at about 100 degrees, the fixing agent molecules condense to each other, forming a larger molecular weight network structure attached to the fabric surface and a layer of film, covering the dye in the film, thereby improving the fastness of the dyeing; B fixing agent binds to dyes and fibers. The end of fixing agent molecule has - NH2 group, while cotton fiber macromolecule also has active group, such as - OH, which is condensated during baking, so that fixing agent molecule and fibre macromolecule are covalently linked. At the same time, there are active groups in dye molecule, such as OH or - NH2. Biocovalent binding; C ion bonding. polyamine type dye fixing agents is generally anionic dyes, so they can be positive and negative charge absorption, in the form of ionic bonds.
April 20, 2017Under the efforts of the new plant auxiliaries and construction workers, the new HT building finished successfully on April 13th in Guanggu Fine Chemical Industrial Park, Sihui City, Guangdong Provinc...view
August 1, 2018(1): Product introductionThe traditional soaping process of reactive dyed fabrics is basically soaped at 95℃, and it has to be washed many times to meet the customer's demand for fabric fastness, whi...view
May 12, 20174.2 The approaches and measures to improve the fastness to wet rubbing 4.2.1 to choose proper dyeChoose high solubility, low substantivity, high diffusivity and high dye-fixing rate dyes and use in th...view
January 4, 20211) Penetrant: it can reduce the surface tension of the solution and make the fiber easy to be wetted and penetrated.2) Washing Detergent: it can wash the dirt on the fabric. It is often used as a scou...view
July 28, 2017Recently, the American Association of Textile Chemists and Colorists (AATCC) international conference was held in wilmington, N.C. The winner of the 2016 Olney Medal was unveiled at the conference, an...view