What are the advantages? Vat dyes have a series of remarkable characteristics compared with other dyes. Because of these characteristics, it is often used to solve certain fastness problems. Let’s take a look!
① The colors of vat dyes are mostly intermediate colors
The colors of vat dyes range from Characteristics of a complete series of colors from yellow to black and from bright colors to general colors. The major feature is that intermediate colors account for the majority. These intermediate colors are basically a single component and have good dyeing reproducibility, especially green, olive green, flesh color, Brown and gray series,
For example, green reactive dyes are generally made from yellow and emerald blue reactive dyes. In order to combine reactive dyes with different dyeing properties, control during dyeing is very important, and in Among vat dyes, there are several green varieties with a single structure, which can not only meet different needs, but also have excellent dyeing reproducibility compared with reactive dyes.
②Excellent light fastness and various composite fastnesses based on light fastness
Currently, cotton fabrics have increasingly higher requirements for various composite fastnesses based on light fastness, such as sweat-sunlight fastness, sweat-sunlight-washing fastness, sweat-sunlight-rubbing fastness, etc. , especially light colors, vat dyes have special properties in this regard compared with other types of cotton dyes, so they are very suitable for dyeing and printing work clothes, summer clothes, sportswear, coats, curtains, furniture coverings, etc.
③Excellent chlorine resistance and wet fastness
Compared with reactive dyes, vat dyes have excellent fastness to chlorine, whether it is chlorine water (20ppm) or chlorine (500ppm); in addition, vat dyes have excellent washing fastness, etc., so reduction Dyes are suitable for occasions with high requirements for chlorine disinfection and washing resistance, such as printing and dyeing of fabrics, beddings, outer coverings, sheets, clothes, etc. used in hotels and hospitals. Especially for products that require multiple washing treatments, use reduction The advantages of dyes are even more obvious. In addition, vat dyes are also very suitable for dyeing and printing textiles that require advanced wet fastness, such as ground dyeing with reactive dyes and textiles with anti-pull-out printing with vat dyes.
In countries and regions such as the United States and Europe, in order to reduce washing water, strong detergents are used, namely tetraacetylethylenediamine (New detergents made by adding TAED) to peroxide or using a large amount of detergent in the washing water and washing with warm water, vat dyes also have sufficient fastness.
④ It has excellent stability for the finishing processing of printed and dyed fabrics
Vat dyes have very little effect on general resin finishing. In recent years, vat dyes have been developed for functional processing that changes the physical properties of fibers, such as shape memory processing, morphological stabilization processing, deodorizing processing, antibacterial processing, etc. Good stability, and vat dye dyeing has more stable changes over time than reactive dye dyeing.
⑤Suitable for one-bath same-color dyeing of blended fabrics
One-bath same-color dyeing of polyester/cotton, nylon/cotton, vinylon/cotton and other blended fabrics is becoming more and more popular in the printing and dyeing industry. Vat dyes have this same-color dyeing characteristic and are suitable for the dyeing of these blended fabrics. One-bath continuous dyeing and printing Flower and dip dyeing are equivalent to color dyeing. These dyed fabrics can be used to make student uniforms, various uniforms, breathable coats and special textiles, especially military uniforms and combat uniforms (such as camouflage uniforms), and have excellent various fastnesses and Anti-infrared and other special properties.
⑥Excellent reduction resistance
This characteristic of vat dyes can be used to produce high-end textiles with reactive dye ground dyeing and vat dye anti-extraction printing, floor-free dyeing of polyester/cotton knitted fabrics (using liquid flow dyeing machines), and polyester/cotton blended fabrics. First dyeing process (cheese dyeing) and high fastness printing and dyeing of polyester/cotton blended fabrics (using URS method), etc.
⑦Can be dyed into colors with natural tones and extremely intuitive and clear colors
Fabrics dyed with vat dyes can show natural plant tones and European style characteristics on the basis of coarse tones, such as indigo ground dyeing and vat dye direct printing of dyed fabrics subjected to various washing treatments (stone washing) , bleaching, etc.), can be made into textiles with extremely clear and natural plant tones.
In summary, vat dyes have a series of significant characteristics compared with other cotton dyes, especially reflected in the fastness performance. Therefore, currently vat dyes It is also a type of cotton dye worthy of attention.
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