DE1174291B - Process for coating yarns, woven and knitted fabrics made from polyamides with cellulose - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

EDITORIAL

Boarding school Class: D 06 w

German class: 8k- 1/08

Number: 1174 291

File number: D 41279IV c / 8 k

Filing date: April 4, 1963

Opening day: July 23, 1964

It is known that shaped structures such as fibers, threads, knitted fabrics and fabrics made of polyamides are used in the Charge electrostatically when using. Various antistatic substances for treatment are known of textiles. The protective effect against the charging is inadequate, as the substances either soluble in water or easily dispersible or emulsifiable in water and when washing and cleaning removed from the fiber.

To achieve a permanent antistatic effect, the application of synthetic resins by one or two-stage processes is also known. Are there to apply relatively large amounts of resin in order to get a good effect. The tissues treated in this way however, show a stiff, hard grip.

It has been found that it is possible to combine yarns, woven and knitted fabrics from polyamides with cellulose to coat that according to the invention the polyamide molded structure in a dilute solution of a Cellulose ester, preferably cellulose acetate, dipped or sprayed with such a solution, the solvent removed and by alkaline saponification of the ester by conventional methods on the polyamide molded structure a coating of cellulose is formed.

It is found that the electrostatic charging of a yarn, woven or knitted fabric treated in this way is significantly lower in relation to an untreated polyamide. The cellulose pad is when Washing and cleaning do not remove the fiber. The handle of a fabric or knitted fabric treated in this way is very pleasant.

Coloring polyamides is often very difficult. The spin dyeing is because of the high melting point of the polymer, in which only a few pigments are used due to the required thermal stability can be quite time-consuming.

When dyeing in the dyebath, in many cases it is only possible to use either good wetfast dyeings moderate levelness or uniform dyeings with poor wet fastness properties. A combination of good levelness with good wet fastness properties is quite difficult and only using special on individual dyes carefully selected from the range and dyeing methods tailored to them to achieve, whereby often still different aids have to be used.

Heretofore, insoluble disperse dyes, soluble anionic acid dyes and were mainly used Reactive dyes used in the coloring of polyamides.

In contrast, the coated polyamide textiles are dyed in such a way that processes for coating yarns,
Woven and knitted fabrics made from polyamides
with cellulose

Applicant:

German Rhodiaceta A. G.,

Freiburg (Breisgau), Engesserstr. 8th

Named as inventor:

Dr. Arnulf Sippel, Freiburg (Breisgau)

a dye or pigment suitable for cellulose ester, preferably cellulose acetate, in the cellulose acetate solution, in which the polyamide is dipped, is added. The dye hits the Evaporation of the solvent at the same time as the cellulose ester settles on the fiber. The majority of the The dyes in question survive the necessary saponification treatment to convert the Cellulose esters in cellulose without losing the color strength.

You can therefore also the textiles treated according to the invention similar to cotton or Dye viscose rayon with the dyes commonly used for cotton or viscose.

example 1

A knitted fabric of Polyhexamethylenadipamidgarn with the laying of L _1: L ₂ and 1-0-4-5: 1-0-0-1 is washed with an \ l _o ° soap solution at 70 ° C. After drying, it is immersed in a 1.5% solution of cellulose two-and-a-half acetate in acetone for 5 minutes and air-dried. The knitted fabric coated with cellulose acetate is treated for saponification for 48 hours with a 5.5% strength aqueous ammonia solution at room temperature. After washing out and drying again, the knitted fabric can be further processed in the usual way.

When comparing the electrostatic charge of the untreated knitted fabric with the coated one Knitted fabrics after rubbing with polyvinyl chloride showed a 60% lower electrostatic charge.

Example 2

A knitted fabric made of polyhexamethylene adipamide yarn according to Example 1 is ^{immersed in a 1.5% solution of cellulose two-and-a-} half acetate in acetone, which

'"' '409 637/392

20% (based on the acetate) of a blue acetate dye contains. The coated knitted fabric is saponified as in Example 1. You get an evenly real colored product, the electrostatic charge of which shows the same values as in example 1.

For example, 3

A knitted fabric made of polyhexamethylene adipamide yarn coated with cellulose according to Example 1 ^{is dyed at 90 to 100 °} C. in a liquor ratio of 1:30 with a solution of 2 g of the red cotton direct dye and 20 g of sodium sulfate in 11% of water. A strong, even and genuine coloration is obtained.

^{Example4 1S}

A knitted fabric of Polycaprolactamfäden is sprayed after washing and degreasing with a 6 ° / ^s oig solution of Cellulosezweieinhalbacetat in acetone. The knitted fabric is then saponified as in Example 1. The coated knitted fabric shows, in relation to the untreated knitted fabric, a 70% reduction in the electrostatic charge after rubbing with polyvinyl chloride.

Example 5

Polyhexamethylene adipamide yarn is washed on a colored spool in 1% soap solution for 30 minutes at 70 ° C and de-oiled. After drying the yarn was 100 m / min is passed through a 2 m long bath, the ig ^e contains a 3% Cellulosezweieinhalbacetatlösung in acetone. After leaving the bath, the yarn passes through a drying tunnel through which hot air flows and is then wound onto a second paint spool. For saponification, the paint spool is treated for 48 hours in a 5.5% strength aqueous ammonia solution at room temperature.

B e i s ρ i el 6

Polyhexamethylene adipamide yarn is as described in Example 5 with a 3% cellulose two-and-a-half acetate solution treated in acetone, which contains 20% of acetate dye (based on the acetate). Man In this way, the yarn is evenly and genuinely dyed.

Claims (1)

Claim: Process for coating yarns, woven and knitted polyamides with cellulose, characterized in that the polyamide molded structure with a dilute solution a cellulose ester, preferably cellulose acetate, sprayed or dipped in such a solution are, the solvent is then removed and the ester layer by the usual methods is saponified alkaline to cellulose. Considered publications:
French Patent Nos. 1106913,1011,310; U.S. Patent No. 2,636,014;
British Patent No. 503,773;
Danish Patent No. 74,698;
Polish patent specification No. 23 535. 409 637/392 7.64 © Bandesdruckerei Berlin