DK143768B - PROCEDURE FOR COLORING TEXTILE MATERIALS CONSISTING OF SYNTHETIC FIBERS, ESPECIALLY POLYESTER FIBERS - Google Patents

Description

143768

The invention relates to a method for dyeing textile material of synthetic fibers, in particular polyester fibers, using methylene chloride, which is allowed to act in a liquid phase in liquid phase on the textile material at the same time as the aqueous dye solution or dispersion.

A method of dyeing textile material of synthetic fibers (French Patent No. 1,141,819) is known, in which halogen hydrocarbons (such as chloroform, trichlorethylene 10 or methylene chloride) are allowed to influence the textile material simultaneously with the aqueous dye dispersion. In this process, only relatively small amounts of halohydrocarbons are required. It also avoids intermediate drying as well as all associated apparatus and color technical disadvantages. Finally, it is advantageous that the staining of this process can take place at very low temperature, i.e. from approx. 20 to approx. 70 ° C.

In the tests of the present invention, it has now been found, in the meantime, that by using methylene chloride it is necessary to make a very accurate dosing of this halogen hydrocarbon in order to obtain a good color yield.

The invention thus aims to obtain the optimum dosage of the methylene chloride used for a good color yield.

The invention thus relates to a process of the kind mentioned in the introduction, characterized in that the following amount of M of methylene chloride is used: M = a · F + b · G, where M represents the amount of methylene chloride (ml), F the amount of float ( 1), G the weight of the fibers to be dyed (g) and where a has a value between 10 and 20 and the factor b a value 30 between 0.1 and 0.2, however, M increases by up to 20%, when the process is carried out in appliances in which the ratio of airspace to float space is greater than 2: 1.

Polyester fibers are preferably used as synthetic fibers.

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The factor a preferably has a value of approx. 15 and the factor b has a value of approx. 0.15.

If you choose a nice ratio (ie a ratio of the product weight in g to the quantity in ml) of approx. 1:10, then the amount of M of methylene chloride used is preferably at ca. 30 ml per 1 great.

Closer insight into the conditions gives the following test results:

Starting from the optimum value 10 (30 ml of methylene chloride per 1 raft at a raft ratio of 1:10), initially the raft ratio was increased and thus the ratio of the amount of methylene chloride used (in ml) to the product weight (ig) held constant. Table 1 shows the test result: With the reduction in the ratio of methy = 20 lene chloride (ml) / nice (1), the color yield was greatly reduced. This deterioration also appears when the said ratio of methylene chloride (ml) / raft (1) is increased in addition to the value of 30 ml per ml. First

In another series of experiments (Table 2), the reverse was achieved, maintaining the ratio between the amount of methylene chloride used (in ml) and the amount of float (in 1) constant. This also showed a strong declining color yield with increasing attractive conditions.

From Tables 1 and 2 one can now conclude the following: If the color yield had remained approx. the same with increasing ratios in the experiments of Table 1, it could have been concluded that methylene chloride exerts its effect almost exclusively in the fiber. If, on the other hand, no decrease in color yield had occurred in the experiments of Table 2, then it could have been concluded that the methylene chloride preferably works in the float. Since neither one nor the other is confirmed, it can be expected that the methylene chloride works in both the fiber and the raft.

In further series of experiments it was now ascertained how this mode of action can be classified as a percentage. Assuming the optimum found (30 ml of methylene chloride per

In one experiment at a ratio of 1:10}, it was determined by extensive experiments that the color yield, by extending the interval of the content of the raft, remains the same without appreciable decline, when the amount of M (in ml) of methylene chloride used is approx. corresponds to the sum of 15 · F + 0.15 · G, where F is the float amount (in 1) and G the weight of goods (in g). In other words, this means that the effect of the methylene chloride is too divided by approx. 50% in the fiber and approx. 50% in the raft at a good ratio of 1:10.

Table 3 illustrates these ratios and shows how the color yield is kept approximately equal, even at an increase in the ratio of rats, in selecting the amount of methylene chloride used in the invention.

Depending on the nature of the fiber and the dye used, the aforementioned factors a and b may assume from the said optimum values somewhat different values within the said limits.

The above formula basically applies, both when the fleet fills the color container completely and when it only partially fills it. However, if the ratio between airspace and float space becomes greater than approx. 2: 1, then the amount M of methylene chloride used must be increased by a factor between 1.0 and 1.2 relative to the stated formula value in order to compensate in the liquid for the amount of methylene = chloride present in the air space.

The above formula must be modified in the case of articles consisting of two or more different fibers. In essence, the quantity of product G must thereby be replaced by the portion of the fiber or fibers which can be dyed by the method described.

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The following working conditions were used in the tables illustrated in the experimental series.

The textile material consisted of polyester fibers in the form of mesh (such as knitwear). The 250 ml float volume comprised 1.25 ml of emulsifier, 1% (based on the textile weight) re = sun-red FB dye, methylene chloride as indicated in the table and the remainder water. The dye temperature was 40 ° C (dyeing in pressure-resistant, closed steel containers). The airspace was less than 20% of the total volume, ie. that the float space was greater than 80% of the total volume, so that this small airspace had no influence.

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