DE965751C - Process for reducing the electrical chargeability of textiles - Google Patents

Description

ΡΑΤΕΗΓΑβΏ)

ISSUED JUNE 19, 1957

I 7925 IVc / 8k

(Great Britain)

of textiles

"The invention relates to a method of treating textiles, and more particularly to treating them of such textiles, which consist of synthetic polymeric fabrics or cellulose acetate, and its aim is to increase the tendency for an electrical charge to build up on these substances to decrease.

According to the method, the textile is made with an organic polyisocyanate and a polyethyleneoxy compound treated, which contains at least two hydroxyl groups in the molecule.

The textile material can be in the form of webs, fibers, threads, yarns, fabrics and the like. and the synthetic polymeric fabric may be made of, for example, polyamide or a high molecular weight comprising linear polyester.

For the treatment of the textiles according to the process forming the subject matter of the invention can any organic polyisocyanate can be used. For example, ethylene diisocyanate, hexamethylene diisocyanate, 4,4'-dicyclohexylmethane diisocyanate, m-phenylene diisocyanate, toluylene-2,4-diisocyanate, Toluene-2,4,6-triisocyanate or triphenylmethane-4, 4 ',. 4 "triisocyanate can be used. Instead of the polyisocyanates themselves, reaction products of polyisocyanates are used, which are effective in that under the working conditions of the treatment process, the polyisocyanates are made free. These products include, for example, polyisocyanate addition compounds such as bisulfite addition compounds, and reaction products of polyisocyanates and

709 551/22

Compounds containing reactive methylene groups, such as acetoacetic acid esters and phenyl urethanes.

Poly ethyleneoxy compounds that can be used include, for example, polyethylene glycols and condensation products of glycerol with ethylene oxide or fatty acid esters thereof.

The treatment of the textile with the polyisocyanate and with the polyethyleneoxy compound can be used simultaneously or sequentially in any order occur. If desired, the two reactants can be applied before use the textile fabric are partially reacted with one another. The treatment is expedient in the presence of a inert solvent carried out for one or both treatment substances, for example ethyl acetate, Acetone, ethylene dichloride or benzene.

After the application of the two agents to the textile material the reaction is terminated on the fiber characterized in that the textile material is heated to a temperature of from ioo to 150 ^0th

Suitable proportions of the two treatment agents are such that an excess of the polyisocyanate compared to the amount required for the reaction with the hydroxyl groups of the polyethyleneoxy compound necessary is.

Suitable amounts of the treatment substances that are applied to the textile material are from 0.02 to 3% by weight of the amount of fabric of the dry treatment fabrics after the evaporation of the Solvent. But smaller amounts of these substances can also be used up to about 0.0005%, whereby a valuable modification of the electrical properties of the textile material is achieved will. Larger amounts of these treating agents, up to about 5%, can also be used, however If such large amounts are used, a certain stiffening of the textile material can occur.

By treating textiles according to the invention made from synthetic polymeric fabrics exist, antistatic finishes are produced which are resistant to washing treatments and use the textiles are resistant.

The invention is illustrated in the following examples without, however, being restricted thereto. the Parts are parts by weight.

example 1

42 parts of a polyisocyanate (produced by reacting of 200 parts of toluene-2,4-diisocyanate with 23 parts of glycerol and 21.2 parts of diethylene glycol in

81.4 parts of ethyl acetate at a temperature not above 80 °) and 20 parts of a polyethylene glycol with an average molecular weight of 300 are dissolved in 200 parts of ethyl acetate. Strand of polyamide fibers are for 10 minutes, immersed in 10 parts by volume erne solution of the specified solution is diluted with 90 parts by volume of ethyl acetate, and allowed to proceed for 50 minutes subjected to a heat treatment at 120 ^0th Strand of Polyäthylenterephthalatfasem 10 minutes, immersed in a solution of 30 parts by volume of the above solution which has been diluted with 70 parts by volume of ethyl acetate, drained and subjected for 50 minutes at 120 ⁰ to heat treatment. Results of measurements of the static charge on these fibers, which occurs when they are wound over a steel pin, are shown in Table 1.

Example 2

18 parts of polyisocyanates prepared according to Example 1 and 25 parts of the monooleate of a condensate of glycerol with 12 parts by mole of ethylene oxide are dissolved in 200 parts of ethyl acetate. Strand of polyamide fibers and Polyäthylenterephthalatfasem 10 minutes go immersed acetate in a mixture of 10 parts by volume of the above solution with 90 parts by volume of ethyl, and left for 45 minutes to proceed at 100 to 140 ⁰ subjected to heat treatment. The measurement results of the static charge that arise on the fibers when they are wound up over a steel pin are shown in Table 1.

Example 3

13.5 parts of a polyisocyanate which has been prepared in the manner described in Example ι, 100 and 30 parts of a polyurethane (prepared by reacting 20.3 parts of a polyethylene glycol with an average molecular weight of 300 with 8.2 parts of hexamethylene diisocyanate for 2 hours 130 ⁰ ) are dissolved in 200 parts of ethyl acetate. Hanks of polyamide fibers and polyethylene terephthalate fibers are immersed for 10 minutes in a solution of 30 parts by volume of the above solution, which has been diluted with 70 parts by volume of ethyl acetate, allowed to run off and subjected to a heat treatment at 120 ° for 50 minutes. Measurement results of the static charge generated on the fibers when they are wound over a steel pin are shown in Table 1 below.

Tabel

Static charges (in μ μ Coulomb / meter) that arise when winding polyamide and polyethylene terephthalate fibers over a steel pin

fiber

Untreated

Treated according to Example 1

before cleaning

Treated according to Example 2 after cleaning

before the
Clean

after this
Clean

Treated according to Example 3

before cleaning

after cleaning

polyamide

Polyethylene terephthalate ..

12,000

13,000

9.5 1800.0

4300 1900 570
2400

2600
8700

2700 670

6800

3600

The tress was cleaned with a solution containing 5 g of anhydrous sodium carbonate and 3 g of soap per liter and treated in this solution for 30 minutes at 80 °. Then they were using 10 times rinsed with distilled water.

Example 4

1.8 parts of toluene-2,4-diisocyanate and 6.2 parts a condensate of glycerine with 24 molar parts of ethylene oxide were separately dissolved in benzene, and the mixed solutions were then mixed with another amount of benzene to one of the following Table 2 indicated concentration diluted. Hanks of cellulose acetate yarn were put into the solution Immersed for 10 minutes, allowed to drain and subjected to a heat treatment for ι hour at 130 °. The measurement results of the static charge on these fibers after conditioning during Coils obtained via a steel pin are included in the table below.

Table 2

Static charges (in μ μ Coulomb / meter),

which when winding acetate rayon threads

occur over a steel pin

TTt » Treated Treated U.N-
treated after after Example 4
with 0.04 ° / ₀ Example 4
with o, i ° / ₀ of the means of the means Before the 35ΟΟ Clean no no Charging Charging After this 53ΟΟ Clean 270 540

The tresses were cleaned 5 times with a solution containing 5 g of soap per liter, and the cleaning treatment was carried out at 40 ^{° for} 30 minutes.

Claims (2)

PATENT CLAIMS: 1. A method for reducing the electrical chargeability of textiles made of synthetic polymers or cellulose acetate, characterized in that the textile material with an organic polyisocyanate and a Polyäthylenoxy connection, which contains at least two hydroxyl groups in the molecule, or treated with partially reacted products of these components and then one Heat treatment at 100 to 150 ^{0 is} subjected. 2. A method for the treatment of textile fabrics according to claim 1, characterized in that the Polyethyleneoxy compound a polyethylene glycol or a condensation product of glycerine with ethylene oxide or a fatty acid ester of the same. Considered publications: American Dyestuff Reporter, 1949, p. 862. Ztschr. Für Angewandte Chemie, 1947, A, p. 257 to 272. ! 5 609 738/347 12.56 (709 551/22 6 ·. 57)