The basic requirements of finishing agent for finishing process

The finishing process is mostly related to the modification of the fiber surface (outer surface and inner surface). The requirements for finishing agents, in addition to giving the fabric new functions or new surface functions, also require these functions to be maintained as long as possible. Therefore, it is best for the finishing agent to form a chemical bond with the cellulose molecule, and it will not easily fall off during the taking. Some finishing agents have two kinds of functional groups on their molecules, one can bind to the fiber, and the other float on the surface of the fiber to change the surface properties of the fiber. This structure is very similar to surfactants, and such finishing agents can be said to be surfactants in a broad sense. According to the changes in the surface properties of the fibers after finishing, finishing agents and finishing processes can be divided into several categories. For example, finishing related to fiber surface wettability includes water-repellent finishing and oil-repellent finishing, finishing related to fiber surface friction performance includes soft finishing, slippery finishing, and other special functions such as hygienic finishing, aromatic finishing, and flame retardant finishing. Finishing, antistatic finishing, etc. Obviously, not all finishing agents are of this model. For example, shrink-proof finishing relies on the cross-linking effect of resins; the bio-lighting finishing of cellulase does not add finishing agents to the fibers, but achieves the goal by reducing the amount. Polymer finishing agents are an important class of finishing agents. It has good film-forming properties. When it covers the surface of the fiber, it forms a new surface and produces a new surface function. There are many functional groups with different functions in the molecular structure of high-performance macromolecular agents. Together with the main chain, they do not play a role. It can be said that they perform their duties and become multifunctional finishing agents.

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