CS240542B1 - A method of producing a self-supporting hairy skin - Google Patents

Abstract

A process for producing a self-supporting hairy surface based on chlorinated vinyl polymers in that a further layer of chlorinated vinyl polymer is applied to the pregelatinized layer on the release liner, into which fibrous particles are introduced and subsequently the whole formation is gelatinized and separated from the separation pads.

Description

240342

BACKGROUND OF THE INVENTION The present invention relates to a process for the production of a self-hiding hair-plated artificial leatherette to base-chlorinated vinyl polymers, the conditions being such that a layer of pasty-chlorinated vinyl polymer is introduced into the fibrous portion by a layer of a chlorinated vinyl polymer paste pregelatinized on a separating substrate and subsequently coated the entire gelatinous structure and separates it from the release liner.

It is known that, in the case of plastic skins with a lined surface, which may be made of natural velor leather, the so-called suede and the backing material, it may be, for example, a knitted fabric, a fibrous runo, a polyvinylchloride foil, a sheet, a fabric or a paper. it is possible to achieve the magnitude of the effect by using sodium chloride, sugar, ammonium carbonate or other water-soluble crystalline substances (German Pat. No. 250,833, French Pat. No. 1,118,687).

According to CSSR Pat. 91,689, the velor effect is obtained by pouring uniformly sized metal crystals onto the surface of the polyvinyl chloride paste. After gelatin, the metal particles are removed by electromagnetic or mechanical forces.

A similar effect can also be achieved by using a roller provided with an abrasive layer (French Pat. No. 2,217,469). U.S. Pat. No. 4,303,706 discloses a process for producing a combed suede fabric using a finely filament scuffed fabric to which a melamine resin emulsion is applied, which is dried and heat treated to cure the resin in the fabric.

Velcro-type plastic goats can also be formed by flocking, while the underlying material, such as fabric, paper, polyvinyl chloride foil, skin-bonded adhesive layer, into which the fiber particles are absorbed (NSR Pat. 2,944,063, RD Pat. No. 2,207,212, U.S. Patent 2,468,682, CSSR Pat. CSSR AO 191 373 relates to a synthetic velor lining which is obtained by applying a polyvinyl chloride paste which is gelatinized and abraded to a single-sided combed cotton fabric.

Franc. pat. 1191200 discloses the application of short fibers to a planar formation of a base of a calcined polyvinyl chloride coated with a "non-polymerized" polyvinyl chloride paste. Czechoslovak AO No. 240 538 solves the process of producing a self-supporting artificial leather with a hair surface so that the fibrous particles are introduced into one layer of a chlorinated vinyl polymer paste.

The disadvantage of the above processes is that a degree of washing is required to form the velor surface by means of water-soluble substances, thereby increasing equipment requirements, process water and cleaning, re-generation of salts and energy requirements for drying.

Achieving the velor effect of the microcrystalline crystals of uniform size requires a special device for their removal and capture.

The grinding wheel does not produce a distinctive velor effect.

In the formation of velvet leatherette by the flocculation method, a semi-finished product or a finished product made in a separate process is currently used as a substrate for flocking, using rubber and polyurethane adhesives most often using plastics as backing materials, which mainly cause environmental problems.

A disadvantage of the known processes in which the fibrous particles anchor into the polyvinyl chloride paste is, in particular, obtaining a non-uniform structure and confusing due to the dimensional instability of the polymer films. These drawbacks are eliminated by the paste layer itself, but its thickness is limited by the geological properties and length of the fibrous particles.

This and other drawbacks are solved by the present invention, according to which the self-supporting chlorinated vinyl polymer-based leatherette with the introduction of fiber particles into the paste surface and subsequent glazing makes the paste layer of the chlorinated vinyl polymer into which the fiber particles are introduced is applied to a layer of chlorinated vinyl polymer pregelatinized on a release liner, preferably with a spatial pattern, and subsequently the entire formation is gelatinized and separated from the steaming pad. An advantage of the present invention is its ease of technological feasibility and the provision of a solid anchorage of the fibrous particles in the chlorinated vinyl polymer. In the case of the use of a separating pad with a tread pattern, the formation of a pattern which is patterned on both sides is ensured.

The chosen two-layer polyvinylchloride base for hair skins permits wide variations in the thickness of the formed formation, as well as the possibility of different composition of the two polymeric layers, thereby achieving the variability of the properties of the entire structure.

In addition to these advantages, the method of the invention has a safety, ecological and e-conomic advantage over previously used systems.

The release liner may be a paper pad impregnated with hydrophilic binders, with a surface coating of a liquid emulsion as a separating agent, an impregnated fabric or a steel non-skid belt.

By chlorinated vinyl polymer paste is meant a viscous suspension consisting of homopolymers and / or copolymers, especially vinyl chloride, plasticizers, fillers and stabilizers, regulators of viscosity and the like.

Claims (4)

2403 42 3 All known fibers of natural and synthetic polymers, such as a) inorganic fibers, in particular polyamide, viscose, etc., may be used to prepare short fiber particles, and the particle size of the applied particles ranges from 0.1 to 15 mm < a fineness of 0.05 to 80 dtex; The fibrous particles can be applied by conventional methods, such as mechanically, pneumatically, electrostatically, or in combination. By gelation is meant the transfer of the polymer and the softener to a homogeneous state by the action of heat. The formed particulate formation is gelatinized at a temperature of from 1 ° to 220 ° C for 1 to 50 minutes. The method of the invention is described, however, the non-limiting example is limited by the following examples. Example 1 A composition consisting of 100 kg of emulsion vinyl chloride chloride having a K value of 70, 60 Jkg of dioctyl phthalate and 2 kg of dibutyltin maleate was prepared. The paste is aged for 24 hours. After aging, the vacuum is vented. The paste prepared in this way is applied to 750 gm-2 on a separating paper with a silicone emulsion overcoat, provided by a spatial pattern, pregelatinized at 150 ° C for 2 minutes. apply pas-ta O! of the same composition in an amount of 250 g. m-2, into which fibrous particles based on polyamide 6 of 4 dtex size of 0.8 mm are introduced in a DC of 5 kV. cm-1. SUBJECT A method of producing a dry-skinned, synthetic-skinned artificial leather based on chlorinated vinyl polymers by introducing fiber particles into the surface of the paste and subsequent glazing, characterized in that the layer of the chlorinated vinyl polymer in the flocked formation is gelatinized at temperature 180 ° C for 4 minutes. After cooling and cleaning from the excess plug, the formed formation is separated from the separating pad. The product serves as haberdashery, footwear and packaging material. Example 2 The procedure as in case 1, except that the first layer is a composition consisting of 100 kg of polyvinylchloride emulsion with a K value of 70, 50 kg of dioctyl phthalate, 25 kg of chloroparaffin, 25 kg of calcium carbonate and 2 kg of dibutyltin maleate. The paste thus prepared is applied at a rate of 1500 g. m ~ 2 on a release paper with a silicone emulsion topcoat coated with a spatial pattern, and annealed at 150 ° C for 5 minutes. The product can be used as a flooring, carpet and material, preferably in a 'wet' area. »Ex. 1 and d 3 Procedure as in Example 2, except that the fibrous particles are based on polyamide 6 of 17 dtex and 2.5 mm in length. 4 Procedure as in Example 1, except that the short fibrous particles are based on polyamide 6 of 3.3 dtex and a length of 1 mm and viscose of 3.3 dtex and 1 mm in length of 1: 1. the fibrous particles are introduced, the layer of the chlorinated vinyl polymer pregelatinized on a separating substrate, preferably with a spatial layer, is subsequently deposited and the whole gelatinized and separated from the release liner.