DE2716923A1 - Imitation chamois leather - is mfd. by precipitating soln. of polyurethane and di:methyl:formamide in pile fabric, drying and grinding surfaces - Google Patents

Abstract

Imitation chamois leather is produced by impregnating a pile fabric with a dispersion of a polyester or polyurethane in dimethylformamide, pptg. the synthetic resin to bond it with the fabric, drying the prod. and grinding the surfaces to produce a smooth finish. The process is cheap and gives a dimensionally stably prodn. having a pleasing appearance. Pref. the fabric has the nap formed on one or both faces from cotton and the finished prod. is subjected to a printing or thermal embossing.

Description

DESCRIPTION

The invention relates to a method for producing synthetic suede , especially of the suede type, in which a textile insert with a solution impregnated from elastomer synthetic resin and the synthetic resin then precipitated by wet coagulation and is thereby connected to the insert. The invention also relates to a Synthetic suede leather produced by this process, for example in the form of a Kunstvel ourlederbahn.

For the production of artificial leather, it is known to imitate the natural model a random fiber fleece using synthetic fibers, so-called Matrix fibers to produce this fleece with a solution of elastomeric polyurethane resin to soak and to connect the resin to the tangled fiber fleece by wet coagulation. An extraction treatment is then required in order to remove the matrix portion of the dissolve from single fiber. The resulting extremely fine bundles of fibrils are preserved such a certain mobility in the tangled fiber fleece. This technically very complicated one and complex manufacturing process naturally also requires a correspondingly high one Price of the finished product. | The invention is based on the object of a technically Finding an inexpensive, appealing and appealing way to find a less elaborate way to be able to produce dimensionally stable synthetic suede leather.

According to the invention, this object is achieved in a method as described at the outset mentioned type solved in that a pole fabric as an insert or carrier material Used with a single or double-sided pole cover and with an organic solvent such as dimethylformamide dissolved polymers based on polyester or polyether urethane is impregnated and that the surface of the composite produced thereby, in which the synthetic resin precipitated like a sponge, sanded off to smoothen after drying will.

Preferably, a woven pile such as cotton is used velvet used, with cotton velvet before soaking with the synthetic resin solution with a Anti-crease equipment can be provided.

It has surprisingly been found that through the use of pile fabrics or pile fabrics, in particular those of the type of woven cotton velvet, as a textile insert or textile carrier material in connection with what is known per se Impregnation with elastomeric polyurethane resin, which is then applied using the wet coagulation method Is precipitated like a sponge, one in terms of its mechanical as well as aesthetic Properties very attractive synthetic suede leather can be produced.

While it is necessary in the above known method, first of all to produce an irrfiber fleece using matrix fibers, see the In contrast to this, textile pile fabrics or pile fabrics in the present invention in the manner of a velvet fabric, used as a textile insert. E-n velvet fabric has a pile cover or pile cover woven in by means of a pile warp over the base fabric on, whereby the fiber web without any tangled layers is evenly dense and of the same length of the individual fibers is above the GrundgeaFe. An exactly vertical position of the through mechanical equipment parallel fibers is not for the invention necessary. Rather, the pile fibers can also have a certain inclined position, this but uniform for all fibers of the pile cover.

Commercially available materials are used for the fibers of the pile cover common fibers such as viscose, cotton, polyester, polyamide and other fibers into consideration. The fineness of the respective individual capillary should be in the range of approximately 1 to 5 dtex. If cellulose fibers are used, these can also be used as a crease-free finish up with dimethylolurea and the like.

As pile fabrics in the context of the invention come in addition to those already mentioned Cotton velvet also pile fabrics made using other techniques, such as knitted fabrics or knitted pile fabrics in question, for example knitted fabrics with a knitted fabric and cutting open the stitches produced pile, as well as woven or knitted fabrics with both sides Pile formed by cut stitches. However, knitted fabrics are unsuitable which has a pile cover created only by roughening the surface, since the individual fibers of such rough goods do not have any parallel equipment below one another and are not of the same length. Velveton-like is therefore unsuitable , i.e. napped woven fabric.

For impregnating the pile fabrics with a polyurethane resin solution in one organic solvents such as dimethylformamide come on polyester or polymers Polyaether urethane base for use which by Failures after form a sponge-like structure using the wet coagulation method.

The weight ratio is preferably between the textile insert and in this resp.

their pole cover embedded polyurethane resin in the finished product, for example 2 to 3 to 1.

The surface of the composite produced according to the invention is sanded to smoothen after drying and then shows a uniform microporous Sponge structure. It also shows, caused by the grinding, on the surface numerous fiber ends or pile components corresponding to the desired suede-like Appearance on. This surface can be printed and / or by means of a leather pattern roller to be embossed in the heat.

The end product produced is, depending on the weight and pile height, of the textile Inlay more or less qeich and flexible. This synthetic suede can be used for! 3 items of clothing such as jackets, skirts, pants, suits, dresses and coats, but also for shoe uppers, Handbags, furniture covers, etc. can be used.

As a particular advantage of the synthetic suede leather produced according to the invention is the excellent dimensional accuracy of the manufactured parts such as To highlight coats, jackets and dresses.

A shrinkage by washing and especially dry cleaning takes place does not take place.

In the drawing is in a schematic and opposite the natural Greatly enlarged in size Cross section an embodiment of a Synthetic suede leather sheet produced according to the invention is shown.

The synthetic suede sheet 1 consists of a woven pile fabric with Base fabric 2 and tufts 3 tied into it in a V-bond, one of which is fibers 4 run essentially parallel to one another and have the same height. The between those shown in the drawing only schematically and in a relatively small number Pile fibers 4 located space is with elastomeric synthetic resin 5 based on polyurethane filled, the precipitated by wet coagulation with the forming a textile insert Pile fabric is connected and has a sponge-like structure. The surface 6 is smoothed by grinding. It can be seen that the fibers 4 up to the surface 6 and are visible there and may even protrude slightly.

EXAMPLE A velvet fabric with a V-bonded nub was used as the starting material the following types are used: pole Nm 70/2, 17 yarn / c warp Nm 70/2, 17 yarn / cm) pure weft Nm 85/2, 30 weft / cm) cotton These goods were washed and peeled off completely bleached, then on a velvet finishing line with or without the addition of Urea-formaldehyde resins and possibly small amounts of silicone dispersions machined so that the desired pole position or the desired pole position was achieved.

The dry goods were then given a 5 with a 9 percent solution One-component polyurethane - formed from adipic acid and butanediol as an ester and an aromatic synthetic di-isocyanate - in dimethylformamide from the Pol side or the back with a doctor blade. The so largely impregnated product was now in Water coagulates, whereby the polyurethane was precipitated in a microporous sponge-like manner. The dried goods were subjected to appropriate surface treatments such as sanding and embossing - brought to the desired final appearance.

Claims (1)

Process for the production of synthetic suede and then heW, posed Synthetic suede patent claims: 1.) Process for the production of synthetic suede leather, {especially in the manner of suede, in which a textile insert with a solution impregnated from elastomer synthetic resin and the synthetic resin then precipitated by wet coagulation and is thereby connected to the insert, that is, notices e t that a pile fabric with a pile cover on one or both sides is used as an insert and with polymers dissolved in an organic solvent such as dimethylformamide on a polyester or polyether urethane basis soaked drd and that the surface of the composite material produced in this way is sanded off for smoothing after drying will. 2.) The method according to claim 1, characterized in that as an insert Cotton velvet used and this with a before soaking with the synthetic resin solution Anti-crease equipment is provided. 3.) Method according to claim 1 or 2, characterized in that the surface of the composite is printed or under heat after sanding is coined. 4.) Synthetic suede, produced according to the process according to one of the Claims 1 to 3, characterized in that that there is a deposit made a pile fabric with substantially parallel and equally long PDL fibers (4), wherein the pile cover (3) up to the level of the free end of the pile fibers with spongy precipitated elastomeric synthetic resin (5) is filled and the whole thing is smoothed and optionally has a printed or embossed surface (6), 5.) synthetic suede according to claim 4, characterized in that the textile insert is a woven, knitted one or knitted pile fabric (2) which has a pile cover (3) in the manner of velvet. 6.) artificial suede according to claim 4 or 5, characterized in that that the textile insert (2) is woven cotton velvet. 7.) synthetic suede according to claim 4 or 5, characterized in that that the textile insert (2) is a Raschel knitted fabric with a cut open Stitch formed pile (3) is. 8.) synthetic suede according to one of claims 4 to 7, characterized in that that the insert (2) is provided with bilateral pile (3). 9.) artificial suede according to claim 4 to 8, characterized in that that the individual fibers (4) of the pile cover (3) have a fineness of about 1 to 5 dtex exhibit. 10.) Artificial suede according to one of claims 4 to 9, characterized in that that the weight ratio between textile insert (2,3) and embedded in this Synthetic resin (5) is about 2 to 3 to 1.