Latest News and Updates on Textile Auxiliaries and Dyes

Reactive dyes are a type of dye that react chemically with fibers during dyeing. This type of dye molecules contains groups that can chemically react with fibers. During dyeing, the dyes react with the fibers and form a covalent bond between the two to form a whole, which improves the washing and rubbing fastness.
Reactive dyes are a new type of dye. In 1956, the UK first produced the Procion brand of reactive dyes. Reactive dye molecules include two main components: parent dye and reactive group. The group that can react with fiber is called reactive group.

The degree of alkali reduction treatment is generally expressed by the reduction rate.
1. Type and concentration of alkali agent
The ability of organic bases to hydrolyze ester bonds is less than that of inorganic bases, but it does great damage to fiber strength.
Inorganic base: KOH>NaOH>sodium carbonate
As the concentration increases, the reduction rate increases
The larger the specific surface area of the fiber, the greater the weight loss rate.

Direct dyes are dyes that can be heated and boiled in neutral and weakly alkaline media without the help of mordants. Direct dyes are formed by combining hydrogen bonds and van der Waals forces between direct dyes and cotton fibers. It is mainly used in fiber, silk, cotton spinning, leather and other industries, and is also used in papermaking and other industries. Direct dyes can be divided into azo, stilbene and other types according to their structure. According to their application classification, they mainly include ordinary direct dyes, direct lightfast dyes and direct azo dyes.

In the textile industry, different fabrics are dyed with different dyes. Cotton, one of the most common fabrics, is the best choice for dyeing because of its high water absorbency. The purpose of this article is to introduce the selection and process of cotton dyeing, and to answer questions that are widely used in daily life and in the textile industry.

When using acid dyes for dyeing, you often encounter problems such as color flowers, discoloration, yellowish light, and insufficient level dyeing. In addition to poor quality of dyes, improper process operation or failure to handle details are also among the reasons for these problems.
Therefore, taking acid dye dyeing of nylon as an example, we will discuss the dyeing process of acid dyes and the issues that should be paid attention to during production.

As the most common fabric, cotton can be made from light and transparent voile to thick canvas and thick velveteen, and is suitable for making all kinds of clothes, furniture fabrics and industrial fabrics.
Different dyes are selected when dyeing different fabrics. Due to its characteristics, cotton can be dyed with reactive, direct, and sulfur dyes. After the dyeing process of distribution, washing, bleaching, dyeing and post-treatment, colorful fabrics are finally produced.

Sulphur dyes are dyes dissolved with sulfide, mainly used for cotton fiber dyeing, and can also be used for cotton/vitamin -mixed textiles. The cost is low, and the dye is generally resistant to the sun, but the color is not bright enough. Common varieties include sulfide, sulfide, etc.

Dyes serve a multitude of purposes in our daily lives, finding applications in textiles, paper, leather, and even food coloring. Among these, the application of dyes on fabrics is particularly widespread. In this article, we will delve into the "past and present" of dyes, exploring the advantages and disadvantages of synthetic and natural dyes. We'll discuss the origins of dyes, how they have evolved, and their various uses. The key questions we aim to answer include, "What is dye made of?" and "How do dyes enhance our clothes?".

Polyester FibersPolyester fiber, commonly known as "polyester", is a synthetic fiber made from chemical polycondensation of organic dibasic acids and glycols. It is a kind of polymer compound and a synthetic fiber with high strength, high modulus and low water absorption.Therefore, traditional water-soluble dyes such as direct, acid, and reactive dyes cannot be adsorbed to this hydrophobic fiber, and therefore cannot be dyed.

Acid dyes refer to the acid group in the dye molecules, also known as anion dye, which can be combined with amino groups in protein fiber molecules with ion bonds and applicable under acidic, weak acids or neutral conditions. Mainly nitrogen and ， structures, a few are aromatum methane structures. Acid Dye Introduction and Different Items, This article show the difference between different dyes and show the benefirness of acid dyes.

There is a very important indicator in the fluorescent whitening agent, which mainly reflects the sunshine fastness of the whitening agent.

Agglomeration in the dyeing of disperse dyes will lead to problems such as color spots, stains, and cylinder contamination. How to prevent the agglomeration of disperse dyes in dyeing, please see the following: 1. The principle of dye aggregationGenerally, the particle diameter of disperse dye is ab