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1. What is a disperse dye

? It is named because it must become a uniformly dispersed dye solution with the help of dispersant when dyeing. Its relative molecular weight is small, its structure is simple, and it does not contain water-soluble groups, such as sulfonic acid groups and carboxyl groups, but it always contains some strong polar groups, such as hydroxyl groups, amino groups and various substituted amino groups and hydroxyl groups, so it has extremely low water solubility. ?

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Second, the name and interpretation of disperse dyes

Usually, the name of a disperse dye consists of three parts: crown name, color name and tail name. The meanings of the three parts are explained in detail below.

1

Title

refers to the name classified by application performance or the brand name of foreign trademarks, such as domestic direct, acidic, and? Cation, activity, reduction, dispersion, polycondensation, blended dyes, etc., Dianix,Foron, etc. abroad.

2

Color scale

indicates the name of the color that can be obtained by dyeing the fabric with this dye according to the standard method, which is generally expressed in the following four ways:

(1) adopting physical common names, such as red, green and blue;

(2) Use plant names, such as orange, pink, grass green, rose, etc.

(3) Represented by natural phenomena, such as sky blue and golden yellow;

(4) Use animal names, such as mouse ash and goose yellow.

functional words and adjectives of dyes can also be added before the general color scale.

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suffix

suffix generally represents the shade, strength, fastness, dosage form, etc. of the dye. Generally speaking, English means colored light, and numbers mean the intensity of colored light, which is quite mixed, and will be different due to different manufacturers, countries and years, and the regularity is not strong.

color light: B- blue light or cyan light; G- yellow light (German Gelb) or green light; R- red light; Y- yellow light;

shade quality: F- shade purity; D- dark or slightly dark; T- means deep;

fastness and use: L- light fastness or dyeing uniformity, N- new or standard; P- printing and so on;

Morphology and strength of dye: Pdr- powder; F- fine powder; Micro Pdr- ultrafine powder; Gr- granular; Liq- liquid; Pst- paste; Conc- thick; Ex.Conc- super strong.

note: the naming of disperse dyes in this paper refers to the names of commercial disperse dyes, and does not involve the naming of structural index and application index.

example 1: disperse emerald green S-GL 2%

disperse? Cui? Lan S G? L ? 2%

dye crown? Adjective? Color sublimation performance? Color light, order of magnitude? Light fastness

Example 2: Japanese disperse dyes naming:

product name

hue

shade

light fastness

sublimation fastness

dyeing properties

commercial dosage form

Kayalon? Polyester

scarlet

r

l

s

f

paste

Example 3: Direct light-fast fluorescent light yellow 7GFF (made in China)

Direct? Sun-resistant fluorescence? Tender? Yellow 7? G ? F ? F

dye title? Functional words adjectives? Color is called the order of magnitude of color light? Color light? Strong fluorescence

Through the above three examples, we can see that the name of dyes is not completely played according to the rules, and there is no mandatory naming rule in the dye industry. Because the domestic disperse dye manufacturing industry started relatively late, the naming of domestic disperse dyes in the early days basically imitated the large foreign manufacturers, which was relatively regular;

Later, domestic and foreign manufacturers also learned from each other in naming dyes, and * * * made progress. With the continuous development of synthetic fibers, especially the development of superfine polyester fibers and blended fibers, it brings new opportunities for the development of disperse dyes, and also puts forward new and higher requirements for disperse dyes; In recent years, disperse dyes with new structures, new application properties and new printing and dyeing methods have emerged, which also challenges the current potential naming rules. Due to the large number of scattered dye manufacturers and distributors at home and abroad, perhaps they name dyes according to their own needs for the sake of brand, market, economic interests and even technical confidentiality, so that some dyes with novel names often appear in the market, which brings many inconveniences to dye manufacturers and related practitioners in the printing and dyeing industry, which is also not conducive to the overall development of the dye industry. Therefore, in order to fully understand the meaning of disperse dyes, we must constantly accumulate experience in practice.