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Process for the production of breathable leather substitutes
AT262927B
Austria
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German
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Description
translated from German
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Verfahren zur Herstellung von atmungsaktiven Lederaustauschstoffen
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Schale herausgenommen. Mit einer Spaltmaschine mit vibrierendem Messer wird zunächst die obere, für den beabsichtigten Verwendungszweck zu dichte Schicht entfernt und anschliessend wird der Rest des Gebildes mit der gleichen Maschine in Scheiben von 1 mm Dicke zerlegt. Man verdrängt aus diesen Flächengebilden das Wasser des Gelgerüstes völlig durch Aceton. Dieser Vorgang kann durch einen Vibrator beschleunigt werden. Jedes der abgespaltenen Flächengebilde wird mit einer Lösung von 145 g Polydiol 200 und 220g Hexamethylendiisocyanat in 600 g Aceton behandelt. Das Flächengebilde wird dann bei 700C im Wärmeschrank von Aceton befreit. Gleichzeitig reagiert das Diisocyanat- Polydiolgemisch zu Polyurethan.
Anschliessend werden die Flächengebilde in Wasser von 750C eingelegt, wobei
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Lösung in Essigester) besprüht und auf ein ebenfalls besprühtes Faservlies aus Superpolyamidfasern vom Quadratmetergewicht 442 g, das mit Polybutadienacrylnitril gebunden ist, aufgelegt und mit leichtem Druck von 9,5 kp/cm bei 300C angedrückt. Zur Bindung des Klebstoffes wird das Gebilde 15 minder Temperatur von 1000C ausgesetzt. Nach der Klimatisierung bei 20 C und 65% relativerEeuchtigkeit zeigen die Gebilde eine Wasserdampfdurchlässigkeit von 5 bis 6 m8/cm/h (nachMitton, : IUP/15). Díe Gebilde halten 200 000 Faltungenmitdem Bally-Flexometer (IUP-20) aus. Im Beispiel wurde Na-Alginat als Polyelektrolyt verwendet.
Es können jedoch auch Pektinate, Celluloseester, Kollagen, Polymethacrylsäureglykolester und andere Polyelektrolyte verwendet werden. Zur Stabilisation des Gelgerüstes können ausser Polyurethanen auch andere Polymere verwendet werden ; z. B. Polyvinylchlorid, Polymethylacrylat, Polyharnstoffe, Harnstoff-, Amin- und Phenolharze.
PATENTANSPRÜCHE :
1. Verfahren zur Herstellung von atmungsaktiven Lederaustauschstoffen, dadurch gekennzeichnet, dass mit Polymeren stabilisierte ionotrope Porenmembrane auf Vliese, Gewebe, Gewirke unter Beibehaltung ihrer Atmungsaktivität aufgebracht werden.
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Process for the production of breathable leather substitutes
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Shell removed. Using a splitting machine with a vibrating knife, the upper layer, which is too dense for the intended use, is first removed and then the rest of the structure is cut into slices 1 mm thick with the same machine. The water of the gel structure is completely displaced from these flat structures by acetone. This process can be accelerated with a vibrator. Each of the split-off flat structures is treated with a solution of 145 g of Polydiol 200 and 220 g of hexamethylene diisocyanate in 600 g of acetone. The fabric is then freed from acetone at 700C in a heating cabinet. At the same time, the diisocyanate-polydiol mixture reacts to form polyurethane.
The fabrics are then placed in water at 750C, whereby
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Solution in ethyl acetate) and sprayed onto a likewise sprayed nonwoven fabric made of superpolyamide fibers weighing 442 g per square meter, which is bound with polybutadiene acrylonitrile, and applied with a slight pressure of 9.5 kp / cm at 30 ° C. To bind the adhesive, the structure 15 is exposed to a temperature of 1000C. After air conditioning at 20 C and 65% relative humidity, the structures show a water vapor permeability of 5 to 6 m8 / cm / h (according to Mitton,: IUP / 15). The structures can withstand 200,000 folds with the Bally Flexometer (IUP-20). In the example, Na alginate was used as the polyelectrolyte.
However, pectinates, cellulose esters, collagen, polymethacrylic acid glycol esters and other polyelectrolytes can also be used. In addition to polyurethanes, other polymers can also be used to stabilize the gel structure; z. B. polyvinyl chloride, polymethyl acrylate, polyureas, urea, amine and phenolic resins.
PATENT CLAIMS:
1. Process for the production of breathable leather substitutes, characterized in that ionotropic pore membranes stabilized with polymers are applied to nonwovens, woven fabrics, knitted fabrics while maintaining their breathability.