Latest News and Updates on Textile Auxiliaries and Dyes

Polyester usually refers to a polymer compound obtained by polycondensation of a dibasic acid and a diol, and its basic chain links are connected by ester bonds. There are many varieties of polyester fibers, such as polyethylene terephthalate (PET) fiber, polybutylene terephthalate (PBT) fiber, and

Pure cotton fiber has the advantages of good moisture absorption, alkali resistance and strong heat resistance, but the fabric finish, uniformity, feel and drape are not as good as rayon;Rayon fiber has good dyeability, high brightness and color fastness, comfortable to wear, moisture absorption sim

In addition to excellent design, the choice of fabric is also an important factor for good clothing. An excellent design concept needs to have matching fabrics to express it perfectly.Therefore, it is their daily needs for fashion designers to pay attention to fabrics and their fashion trends.As an

For the dyeing of cellulose fibers, the proportion of reactive dyes is currently the largest. Reactive dyes are water-soluble dyes containing reactive groups that can chemically combine with macromolecules such as cotton, wool and silk, so the soaping and rubbing of dyed fabrics The fastness is very

With the continuous development of printing and dyeing technology, the style of denim fabrics continues to change. Printed denim fabrics are widely favored by consumers for their three-dimensional and realistic style. In terms of its printing process, the denim industry currently mainly involves dis

Soaping fastness refers to the degree of fading of dyed fabrics after soaping in soap solution under specified conditions. It includes the original fading and white cloth staining. Original fading refers to the fading of printed and dyed fabrics before and after soaping. White cloth staining is a si

The fading and discoloration of dyed fabrics is a relatively complicated process. Under the action of sunlight, the dye absorbs light energy and the molecule is in an excited state. It is unstable. The energy obtained must be released in different forms to become a stable state. One of the forms is

1. Direct dyes Structural properties: Direct dyes are a kind of water-soluble anionic dyes. Most of the dye molecules contain sulfonic acid groups, and some have carboxyl groups. The dye molecules and cellulose molecules are combined by van der Waals forces and hydrogen bonds. Dyeing objects and met

1. Reduction and cleaning under alkaline conditions: Soaping agent + reducing agent (sodium sulfide or thiourea dioxide) + alkali (caustic soda or soda ash), but many domestic dyeing factories do not use soaping agent. Soaping agent: non-ionic surface active agent, which is conducive to dissolving,

1. The choice of dye: a. Reactivity: medium degree; b. Directness: medium to low. In addition, the fixation rate of the dye itself must be considered: if the fixation rate is too low, the amount of dye is large, which is not conducive to post-washing. Generally speaking, the domestic m-type and fore

1. Dyeing process The dyeing process can be roughly divided into three stages: A. Absorbing Adsorption is the process in which the dye attaches to the surface of the fiber; the dye is adsorbed by the fiber in the solution due to the intermolecular force and the electrostatic attraction between ions.

Causes of scattered dyeing spots and spots There are two kinds of color spots and spots produced by the high temperature and high pressure dyeing machine when dyeing polyester knitted fabrics:1. The color spots and spots caused by the condensation of dyes can be repaired with a repair agent or strip