DE275570C - - Google Patents

Description

IMPERIAL

PATENT OFFICE.

PATENT LETTERING

- M 275 570 CLASS Bm GROUP.

R.WEDEKIND & CO. m. b. H. in UERDINGEN.

of the Alizarin series.

Patented in the German Empire on December 14, 1911.

In-depth investigations have led to the surprising and technically important result led to many water-insoluble dyes, such as vat dyes and mordant dyes of the alizarin series are capable of being in aqueous, neutral, acidic or alkaline suspension on the unheated or pre-pickled vegetable or animal fibers in the cold greedily to draw and so with the fiber one

ίο enter into kind of unstable connections, which but have sufficient strength to be able to act in one way or another in the stable, absolutely true colorations. It is very surprising that in this way uniform, well-colored colorations can be achieved.

The technical advantages of this method are manifold.

Since the fleets are kept very short,

In addition, the large and therefore expensive dyeing vats and costly hours of cooking are no longer necessary large amounts of liquid in the case of stain dyes and the associated moving of the material to be dyed are also omitted.

Since the uptake of the dye is virtually complete if the conditions are met takes place, the vat dyer has it at hand, the dyeings with precisely measured amounts of dye to execute. The annoying and time-consuming adjustment of the vat to the desired one Dye content does not apply. Especially with mixed shades of two or more dyes, which are taken from the vat in Pulling leuco form onto the fiber unequal quickly comes the technical advantage of the method clearly to the fore.

Another advantage is the fact that the leveling of the dye is already carried out during the Formation of the first labile connection occurs. The dyer is therefore responsible for the execution of the second part of the dyeing process, the conversion of the labile dye compound into the stable form, d. H. into the actual coloration, exaggerated the concern of equalization, so that this second operation was carried out in closed mechanical apparatus can be. All these advantages result in a considerable reduction in the cost of dyeing.

The shorter the fleets are kept, the faster and more complete the absorption takes place of the dye suspended in water. The silk fiber, then, shows the greatest affinity for the dyes suspended in water comes the wool fiber. With cotton you have to go to considerably shorter fleets grab if you want to achieve complete dye absorption. If the fleet is too short the colorations are slightly uneven. However, by padding the material to be dyed for a longer period of time finally achieve sufficient equalization in the cold.

The formation of the first unstable compounds between the dyes and the fiber takes place at the vat as well as the water-insoluble stain dyes in the same way the second process, the conversion of the unstable color into the actual stable coloration, must

different methods can be used depending on the nature of the dye.

In the case of the vat dyes, it is possible to achieve the unstable coloring, which is against cold and warm water is sufficiently stable, but goes down when soapy, in the real color to convert by the fact that the labile connection on the fiber is voided in an alkaline manner and then let it oxidize in the air.

ίο Strangely enough, when working properly no significant amounts of the dye dissolved from the fiber. In the patent specification 177952, class 8 m, a dyeing process has been described, according to which the dye, thickened with glue, rubber, etc., is splashed onto the cotton fabric and the fabric thus prepared is then treated with an alkaline reducing solution will. The process is only protected for indanthrene dyes (it is in the description expressly pointed out that indigo does not produce any useful results), but the present process is capable of general application. In addition, both methods have nothing in this regard common when it was impossible to foresee that the unreduced vat dyes would also work without it To draw adhesive in insoluble form from the aqueous suspensions onto the fiber able, and that these dye attachments despite the absence of adhesives are not largely dissolved again by the alkaline reducing solution.

In the case of water-insoluble mordant dyes of the alizarin series, it is sufficient to use the water-resistant, labile ones Color off connec fertilize under water to heat or steam.

The more detailed way of working is as follows Examples explained:

A. Vat dyes.

First operation. Unstable binding of the
Dye.

Example 1.

10 kg of cotton are dry or moistened with 40 liters of neutral or slightly alkaline Indigo suspension, containing 200 g of indigo, padded at ordinary temperature. The absorption of the dye is completed in a few minutes. There are still short ones Time after, whereby the equalization is very promoted.

Example 2.

10 kg of cotton become more neutral with 401 or weakly alkaline suspension, containing 200 g of Algol orange in addition to 100 g of Algol blue, as with 1. padded.

Example 3.

10 kg of cotton are containing 50 l of neutral or weakly alkaline suspension 150 g indanthrene and 150 g thioindigo red, as padded under 1.

Example 4.

10 kg of wool are dry or moistened with 601 neutral or slightly acidic Suspension of Algol yellow, containing 200 g of dye, as padded under 1.

Example 5.

10 kg of silk become in a moistened state in 200 liters more neutral or slightly acidic Suspension containing 300 g of Algolorange at ordinary temperature as in acid dyeing moved. The absorption of the dye is complete in a few minutes.

Second operation. Vat on the fiber.

In all cases, this is done in such a way that the dyed material is pulled out after absorbing the dye in the first operation in an alkaline hydrosulfite solution brings, which is expediently mixed with salt or sulfate. The amount of the alkali and the hydrosulfite must depend on the nature of the dye, and e.g. B. be much higher in indanthrene than in Indigo or algol colors. The total amount of liquid only needs to be so large that the liquor covers the material to be dyed in the uncompressed state. When working properly, which can easily be determined in each case, it is possible to reduce the dye on the fiber so that none significant amounts of it are detached from the fiber. After the reduction is finished is wrung out, covered, rinsed and soaped.

B. Alizarin mordant dyes.
First operation. Formation of the unstable varnish.

Example 6.

10 kg of cotton pre-stained with clay ready for dyeing as usual for Turkish red are padded with 50 l of alizarin blue cast suspension containing 200 g of alizarin with or without the addition of acetic acid lime and Turkish red oil, at normal temperature. The absorption of the dye is completed in a few minutes. ^Χ1 5

Example 7.

10 kg cotton pre-stained as usual for Turkish red for dyeing are padded with 501 suspension, containing 100 g alizarin bluish tint and 100 g anthrapurpurine, as in 6.

Example 8.

ίο kg as usual pre-chromed wool are in 60 1 neutral or weakly acidic suspension containing 200 g of flavopurpurin with or without the addition of lime acetic acid and turkey red oil, at ordinary temperature like moved with acid dyeing. The absorption of the dye happens in a few Minutes.

Second operation. Developing the varnish.

The formation of the varnish relies on the pre-pickled one after the alizarin dye has been absorbed Fiber very soon in the cold. The progressive deepening of the color of the property one can follow the progress of the lacquer formation very clearly. However, days are necessary to the formation of the varnish with ordinary

ao temperature to be reasonably complete. The formation of the varnish occurs almost instantaneously when it is heated in a moist state. ^{Boiling under water for 1} Z ₄ to ¹ Z ₂ hours is sufficient to develop the varnish. An even stronger varnish is formed if you remove the dyed material after the first operation at 1 to I ¹ Z ₂ atm. steams Since neither water nor steam tear the lacquer, which is bound to the fiber in an unstable state, from the fiber, the dyed material can simply be placed in piles on top of one another in the boiling or steaming apparatus when boiling under water or steaming. Any moving or similar manipulations are unnecessary, and the amount of water is irrelevant. On the other hand, its hardness must be taken into account. The finishing of the dyed material is done in the usual way.

C. Mixed vat and alizarin stain dyes.

First operation. Example 10.

10 kg cotton pre-stained with clay ready for dyeing as usual for Turkish red are with 501 suspension containing 150 g alizarin and 50 g algol yellow with or without the addition of acetic acid lime and turkey red oil, padded at ordinary temperature. The uptake of alizarin and algol yellow is completed in a few minutes.

Example 11.

kg of wool, pre-chromed as usual, are mixed in 60 liters of weakly acidified suspension, Contains 200 g of alizarin bluish tint and g of algol yellow, at normal temperature padded. The absorption of the dyes is completed in a few minutes.

Second operation.

The extracted dyestuff is only used for the purpose of developing the alizarin lacquer either heated or steamed under water. For the purpose of fixing the vat dye, which the dye is not torn off when steaming or boiling under water, must be subsequently alkaline. The alizarin varnish once formed suffers not below. You get real mixed nuances after rinsing and soaping.

Claims (1)

Godfather saying: Process for dyeing with water-insoluble vat dyes and mordant dyes der- alizarin series, characterized in that the unpickled or pretreated dyed goods first with neutral, acidic or alkaline, watery Bringing suspension of the dyes into intimate contact at ordinary temperature and the resulting labile dye compounds into the actual stable ones Dyes transferred, in the case of vat dyes by subsequent vat on the fiber and oxidation of the leuco compound formed, in the case of mordant dyes the alizarin series by subsequent heating under water or steaming, in the case of mixtures of vat dyes with Alizarin stain dyes by subsequent heating under water or steaming and then vatting on the fiber and oxidizing the leuco compound formed.