DE1156049B - Process for the production of colored fiber artificial leather - Google Patents

Description

Process for the production of colored synthetic fiber leather. Synthetic fiber leather are known to be products in which a random fiber fleece with an aqueous emulsion or dispersion of film-forming adhesives, e.g. B. latex or plastic dispersions, was solidified.

Attempts have already been made to convert these leather substitutes into dyed leather substitutes to process, but without achieving useful results.

It has now been found that porous, highly absorbent sheet-like structures can be used from tangled fibers, as you can z. B. obtained from German Patent 930119 has, with very good success, can be processed into colored leather substitutes, if one looks for the so-called covering color technique (see "Das Leder", 1956, p. 252, "Lederzurichtung with plastic dispersions «) works, d. i.e. if you look at the said high-absorbency Nonwovens a paste-like, pigment-containing primer based on water Dispersion of polyacrylic esters applies, the same after drying with a layer of varnish provides, dries again and then in a manner known per se at increased Temperature of a pressing, in particular grain pressing, subjected.

The pigment colors used in the trade are called "Eucanol colors extra dough" available pigment colors.

An aqueous binder is prepared with the addition of high-polymer binders Mixture of colors and carries this onto the highly absorbent fiber fleece as a paste-like, pigment-based primer on one side.

Example Composition and properties of the pigment-containing primer (Paste) 100 g pigment in dough form with good coverage (eucanol color extra Dough), 100 g of 40 ° loige anionic, aqueous dispersion of high-polymer acrylic acid esters, 25 g high polymer binder in colloidal aqueous-alcoholic solution to increase the filling effect and elasticity (Eukesolbinder S), 4 g oil emulsion with polymer content for softening the binder preparation (Eukanolpaste KFB), 5 g plasticizer oil and fatliquor, 250 g water (softened), 2 to 4 g ammonia (technical); Thickener. Of this Paste 350 cm3 per 1 m2 of the highly absorbent fiber fleece with a sponge or applied with the spray gun in two to three cross-sprayings (primed).

It is important to ensure that the color does not bleed through. These There is a risk on the one hand with very thin fleeces and on the other hand if too strong diluted paint mixtures is primed.

In special cases, you can also deliberately color through. Here it is recommended to mix with a little more water or less ammonia to apply. It is then preferable to work with thin fleeces.

The flat material thus colored on one side is then at 35 Flashed off up to 40 ° C 111z up to 2 hours.

If the surface is to be smooth and free of pits, the process is repeated, The opaque paint must not be applied excessively.

250 ems of nitrocellulose lacquer per 1 m2 applied and dried again for 1 to 2 hours at about 35 ° C. The colored one The surface can be embellished by pressing in scars.

The vented fleece can also be used with a finishing varnish as follows Composition: 160 g colorless final lacquer based on nitrocellulose; gives high gloss, 40g methylanone, 40 g ethyl glycol, 80g high-boiling ester, 80 g butyl acetate, 1.6 g dibutyl phthalate; Plasticizer for paints, lightfast, Cold-resistant, wrinkle-proof and film-proof, 4.8 g castor oil. The final paint The above composition is cross-sprayed once or twice with the spray gun applied and flashed off at 35 to 40 ° C 11I2 to 2 hours and then pressed. It must be at a pressure of 300,000 atmospheres in a time of 6 seconds 60 to 70 ° C can be pressed.

The pad must not be too soft. That. Pressing gives the artificial leather prepared in this way the desired suppleness.

The surface can be beautified by pressing in scars. The color effect can be achieved by adding 1 to 5 g of eukanol brilliant dye increase in the liter.

The Bally flexometer sample showed no damage after 200,000 folds the top coat. The air and water vapor permeability is approximately the same as with chrome upper leathers.

This newly developed process has a major advantage in the fact that you can cook the so prepared artificial leather indefinitely, without yourself the qualities in terms of color fastness, aging, suppleness and appearance change.

It can therefore be used in many ways.

It is pinch and tear-resistant and can be stitched to a width of 3 mm without To run the risk of it running away.

There is a difference in quality compared to the known types of artificial leather in that it is soft like leather, porous and permeable to air and therefore warm. That The tangled fiber fleece mentioned at the outset is the basic material of the new artificial leather obtained in this way.

The invention property of the subject of the application is in the application seen per se known basic or covering colors for porous nonwovens.

Claims (2)

PATENT CLAIMS: 1. Process for the production of colored fiber plastic leathers, characterized,. that a paste-like, pigment-containing primer based on an aqueous dispersion of polyacrylic esters applies, provides the same with a layer of varnish after drying, dries again and then in a manner known per se at an elevated temperature of a pressing, especially subject to scar pressure. 2. The method according to claim 1, characterized in that that the binder contains only about 50111o water and the content of dye paste in the Binder is about 20%. Publications considered: Das Leder, 1956, P. 252.