SU70630A1 - Method of dyeing and printing textile materials by vat dyes - Google Patents

Description

The vat dyes (indanthrene, indigoid) have a number of valuable practical properties, due to which they find wide application in the textile industry.

Before dyeing and printing, these dyes should be converted to a leuco compound by reconstituting hydrosulphite in a silk solution. Since solutions of leuco compounds are easily oxidized by atmospheric oxygen, this method of application has a number of inconveniences and requires special equipment in some cases. In addition, during restoration dyeing and printing, part of the expensive dyes are irretrievably lost as a result of the restoration, as well as in washing operations.

The present invention proposes a new method for applying vat dyes, eliminating the disadvantages of restorative dyeing and printing. In particular, the invention makes it possible to successfully print vat dyes without transferring the latter into highly dispersed pastes or powders ("suprafix).

The proposed method consists in the fact that vat dyes are dissolved before use in special organic solvents, for example, tetraethylene pentamine, triethylene tetramine, diethylene triamine, 2-aminoethylethanolamine, etc.

In these solvents, the dyes are completely dissolved to form intensely colored complexes. The resulting solutions, diluted with water at room temperature in any of its relations, have substantive properties.

Example 1. 5 g of a dye gold-yellow vat dye is dissolved by boiling in 25-30 g of those of traethyl pentamine. A dark viscous solution is formed. Upon cooling, the solution is diluted with water to 1 l, heated to 40-50 ° and used for dyeing. It is possible to color both cellulose and protein fibers, since it is thanks45

By the absence of mineral alkali, protein fibers are not damaged.

The gamma of zwegts is different from that obtained in the case of regenerative dyeing, since a molecular complex consisting of a dye and a solvent passes to the fibers (in the case of vat yellow, for example, pink).

The proposed method can also be used for conventional restorative dyeing and printing, with the amount of hydrosulphite and alkali being less than usual, leach solutions are faster and more stable.

Example 2. a) The fabric is dyed in a solution of the bottom dye (for example, chlorindantrene) prepared by diluting the dye-α-tetraegillenpentamine complex with water. dye + aminoethylethanolamine. The preparation of these complexes is described in step 1. Dyeing is carried out in the usual manner for substantive dyes.

b) Painted material with a color different from the usual one is treated in the second bath.

hydrosulfite with alkali to destroy the complex and transfer the dye on the fiber to its normal state.

Subject invention

Claims (3)

1. A method of dyeing and printing textile materials with vat dyes using diluted with water solutions of them in organic solvents, characterized in that the dye is dissolved in tetraethylene pentamine, triethylene tetramine, diethylene triamine or 2-aminoethylethanolamine, the resulting solution is diluted with water or water with a thickening agent and dyed or printed in a mode generally adopted for substantive dyes. 2. A variation of the method according to claim 1, characterized in that, after dissolving in an organic solvent and diluting with water, the vat dyes are reduced. 3. A variation of the method according to claim 1, characterized in that in order to obtain a colouration color that is usual for bottoms, the dyed material is treated in the second bath with an restorer.