DE1077632B - Process for equipping cotton curtains to be washable - Google Patents

Description

GERMAN

As is well known, the cleaning of curtain fabrics causes - apart from the actual cleaning process - the additional difficulty that, as a result of the swelling associated with washing, and deswelling process become unsightly after drying. You have to tighten them in order to give them the To take shrinkage and bring it back to its old shape.

It is obvious and has already been tried in practice to replace the curtain fabrics with one of the in the case of the usual anti-crease finish, similar treatment to the cotton poplin gives a firmer structure lend so that the stitch structure is better preserved during washing.

But the above-mentioned anti-crease finish can be applied to the close-knit cotton fabrics Wide-meshed curtain fabrics are not easily transferred to the extent that they have been used previously The tear strength shrinkage that occurs with the usual finishing method is noticeably higher than with the firmer cotton poplins.

Curable resins are used in these methods. Certain catalysts are used for curing necessary. By using the usual curing catalysts for the wash-resistant curing required temperatures up to 150 ° C released acid (e.g. hydrochloric acid from ammonium chloride) evidently finds better surfaces to attack in the wide-meshed structure of the curtain fabrics than in the narrow-meshed ones Cotton poplins. In any case, one of the poplin equipment suffers similarly - with z. B. urea-formaldehyde resins with the aid of ammonium chloride ■ - ■ equipped curtains show a drop in tear strength of 50%> and more compared to a loss of tensile strength of about 35%> in the case of poplin fabric.

Such a type of equipment can only be of practical importance if it is possible to achieve a to achieve an effect analogous to the crease-proof character, namely in the curtain - unhindered by the Washing process - to keep the stitch structure unshrinked without the tear resistance suffering.

This object is achieved according to the invention in that one in a method for washable Equipping cotton curtains with curable resins in the presence of catalysts containing lactones up to 5 carbon atoms in rank are used as catalysts, which are not in the form of the corresponding acids have a fiber damaging effect.

It is already known that particular cellulose as such is able to react with lactones, but not that catalyst effect according to the invention.

In the process according to the invention, the lactones mentioned, as curing catalysts, remove processes for making them wash-resistant
of cotton curtains

Applicant:

Deutsche Bobinet-Industrie AG,
Trier, Luxemburger Str. 82

Heinz-Herbert Kähne, Trier,

Dr. Hermann Behncke, Frankfurt / M.,

and Klaus Wollmann, Eschhofen near Marburg / Lahn,

have been named as inventors

the precondensation resin of the urea or type. Melamine formaldehyde removes the water of condensation and reacts as corresponding oxyacids not so strongly acidic that they can damage the fibers. One arrives at by the treatment method Curtain fabrics that no longer need to be stretched after washing, even after repeated use Laundry not, and no or only a very small drop in tear resistance (less than 10%>) suffer.

In addition, this curtain finish is also advantageous in that it improves the adhesive strength of the Reduces dirt on the textile. You don't need to boil the curtains with the detergent solution, Instead, the lye can be heated to 60 to 70 ° C.

example 1

The curtain fabric is impregnated with a liquor made from a solution of 120 parts Urea-formaldehyde precondensate (from 60 parts of urea and 200 parts of 30% formaldehyde) in 1000 parts of water; 2 parts of gluconolactone are added as a catalyst. After padding the curtain fabric is predried for 15 minutes at 80 ° C and then for 2 minutes in a tenter heated to 140 ° C to harden the resin.

After washing in soapy water at 70 ° C, the curtain hangs out smoothly without tension and shows after drying, a drop in tear strength of 5%.

Example 2

Treatment as in Example 1, except that instead of the 60 parts of urea, 126 parts of melamine are used for the

909 760/393

speaking resin precondensate used. Result as in example 1; Drop in tear strength 4%.

Example 3

Treatment as in example 1; the resin precondensate here consists of a mixed precondensate (from 30 parts of urea and 63 parts of melamine, precondensed with 200 parts of 30% formaldehyde), Dissolved in 1000 parts of water and added 4 parts of gluconolactone as a curing catalyst. result as in example 1; Drop in tear strength 2%.

Example 4

Treatment as in example 1; The resin precondensate consists of urea-glyoxal precondensate (from 18 parts of urea, with 54 parts of 3O% aqueous Glyoxal are precondensed), dissolved in 500 parts of water and 2 parts of gluconolactone as a catalyst added. The curing takes place as in example 1. Result as in example 1; Loss of tensile strength 8th%.

Example 5

25th

The curtain is impregnated with a resin precondensate composed of 42 parts of melamine and 100 parts 30% aqueous glyoxal, dissolved in 500 parts of water and added 4 parts of butyrolactone as a catalyst. The curing takes place as in example 1. Result as in example 1; Loss of tensile strength 10%.

Example 6

The curtain is filled with a precondensate of 126 parts of melamine and 200 parts of 30% formaldehyde - dissolved in 1000 parts of water - soaked and 5 parts of levulinic acid lactone added. The curing takes place as in example 1. Result as in example 1; barely noticeable drop in tear strength.

Claims (1)

PATENT CLAIM: Process for making cotton curtains washable by means of hardenable resins in Presence of catalysts, characterized in that the catalysts used are lactones with up to 5 carbon atoms are used in the rank, which in the form of the corresponding acids do not damage the fibers works. Considered publications:
U.S. Patent Nos. 2,721,784, 2,731,323. © 909 760/393 3.60