DE438323C - Dye preparation for dyeing cellulose acetate or fibrous materials containing it - Google Patents

Description

Dyeing preparation for dyeing cellulose acetate or containing it Fibrous materials. It has been found that pray staining containing acetyl cellulose or from such existing fibrous materials. of all protective colloids or dispersants, which are applicable, the condensation products of naphthalene with formaldehyde in sulfuric acid solution or of naphthalenesulfonic acids with formaldehyde deliver the best results. Using these condensation products one can new ones: @ liscliprodu% te, which repair the dyer, the acetate silk and other fabrics containing acetyl cellulose with the greatest simplicity to color. The condensation products mentioned can by the process of the patent 292531 are produced; in the example is a more advantageous way of preparation described.

The new mixed products "earths are obtained by finely distributing them Dyes which are related to acetyl cellulose and which are in water are insoluble or almost insoluble with the naphthalene-formaldehyde condensation products mentioned and mix enough water intimately. This creates dyestuff doughs that are dyed in the dyebath behave exactly as if the dye was dissolved in the bath. The Fiii-ber does not need to take any special precautions and can use acetyl cellulose obtain a wide range of different colors without diazotizing on the fiber and having to combine. The doughs can also be supplied dried and in powder form will. Direct cotton dyes can be added to the powder to create dye mixtures to get what fibers, partly made of cotton and partly made of. Acetyl cellulose exist, stain at the same time. The dye liquor may be neutral, slightly acidic or be weakly alkaline; however, saponification of the acetyl cellulose should be avoided.

Basic dyes, which are known to be associated with the condensation products Deliver color lakes are unsuitable for this process, as these color lakes do not Are related to acetyl cellulose.

Example i.

Preparation of the naphthalene-formaldehyde condensation product according to Patent 29z531. 100 parts of naphthalene are mixed with 100 parts of sulfuric acid monohydrate at 160 hours sulfonated. iThe resulting product is diluted with 4th parts of water while cooling. Then 3 parts of formaldehyde (; 1o percent ) added and the mixture heated to g5 ° to roo 'C for 6 hours; after cooling is diluted with 6 parts of water and partially with 6 parts of 38 percent sodium hydroxide solution neutralized.

Example 2. Preparation of the dye dough.

To red parts of the dispersant obtained according to the example rooParts of the monoazo dye from p-nitroaniline and diphenylamine in Gradually mixed into a fine distribution and stirred well. The product received can easily be used by the dyer like a dye dough.

Example 3.

Dyeing of acetylcellulose silk.

In a dye liquor containing cold water, so much of added to the product of example s and stirred in well that on iookg to be colored Acetate silk z kg of dye is present. After it is well mixed, it will be good soaked acetate silk in the liquor: "brought and in the usual way gradually warmed to 7 o 'to go ° C: table salt can be added to the dyebath.

Dispersion mixtures or doughs can be obtained in a similar manner will be off. i, 4-diaminoanthraquinone or methyldiaminoanthrarufin (see British Patent 211720) and the partially neutralized naphthalenesulfonic acid-formaldehyde condensation product. When dyeing with these products you get violet or blue on the acetyl silk.

Claims (1)

PATENT CLAIM: Dye preparation for dyeing cellulose acetate or fibrous materials containing this, consisting of insoluble or almost insoluble Dye and a naphthalene formaldehyde condensation product with water in dough or in dry powder form.