The Working Principle of Easy Care and Wrinkle-Proofing Finishing Agent
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I. The mean of easy care finishing
Compared with chemical fiber, natural fiber has excellent moisture absorption, air permeability and anti-static properties. It is ideal material for clothing, but it is easy to wrinkle after washing and needs ironing. With the accelerating pace of modern life, people generally have no time to iron clothes, thus easy-care finishing has become one of the indispensable and important process in the textile dyeing and finishing.
The easy-care textile on the market mainly include shirts and pants, uniforms and other clothing, and bed sheets, pillowcases, curtains, tablecloths and other household textiles.
II. The causes of wrinkle of textiles
Cellulose fibers are divided into crystalline and amorphous areas, and amorphous areas determine the softness of the fibers. Under the action of external force (washing or wearing process), the fiber is bent and deformed, the inner part of the amorphous region is broken by hydrogen bonds, and a new hydrogen bond is formed at the new position, and the relative displacement is produced in the crystalline region. When the external force is eliminated, the system undergoes creep recovery. When the external force is large enough and long time effect on it, the newly formed hydrogen bonds generated resistance is greater than the restoring force, so that the system can not completely eliminate deformation in the external force to recover the original shape, and the deformation will not restore as a permanent deformation, i.e. forming wrinkle.
III.The working principle of textile's easy care and anti creasing agent. Wrinkle mainly includes two kinds of performance: ①improve the anti creasing of textiles, refers to the deformation of the fabric requires a larger force, it need to be achieved mainly by increasing the fiber stiffness;② improve textile wrinkle resilience, which accelerated the recovery rate of fiber, enhance its elasticity.
We know that the wrinkle is caused by low-recovery rate high elastic deformation permanent deformation, If we heat or swell the stretched permanent deformation of fiber, it would make the fiber part of the attractive force between the molecules is weakened. Thereby reduce the blocking effect of the new bond, to return to its original shape of fiber. At present, anti-wrinkle principle include two principle as follows:
1. Resin deposition theory
In the early days of anti-wrinkle finishing, the theory of resin deposition is mostly used in condensed resins. They are multifunctional compounds. Using this kind of finishing agent for textile processing, after baking, the early shrinkage will further condensate to form a network structure, and deposit between in the amorphous region or fibrils, In this theory, by mechanical action, the relative slip of cellulose fiber can change the molecules or the basic structural units, namely by mechanical friction or hydrogen bonding, it will change the rheological property, thereby improving the anti-wrinkle property of textiles.
2. Covalent cross-linking theory
This theory is more convincing than the theory of resin deposition. It is suitable for crosslinking finishing agent. Under certain conditions, the finishing agent can not only polycondensation by itself, but also react with hydrogen bonds on cellulose. Therefore the textile finishing agent crosslinking after finishing agent by the single molecule or polycondensate form covalent cross-linking molecular chain in the amorphous region between cellulose fibers, like two powerful finishing agent out of the "hand" seize the chain in the amorphous region, which contain and fixed effects the fiber between molecular chains, limits the relative slip between the molecular chains of two, thus reducing the deformation without immediate recovery, so as to improve the recovery ability of fiber deformation, which improves the fabric elasticity, the smoothness can be improved.
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