CS221551B1 - Material replacing the leather and textile - Google Patents

Abstract

Invention se concerns thermoplastic mate # , replacing skin and textile, in form beznosičové foam foil from thermoplastic polymers ethylene and optionally next ter # moplastic polymers or polykonden- back, fillers reinforcement substances, plasticizers, stabilizers antistatic reagents or dyes who material se characterized by that foam foil consists that mixtures kopolyme # ru ethylene with vinylacetate in weight amount 37.5 to 75 %, in which Yippee vinylation- melt included in weight amount 5 ° / o and copolymer ethylene with vinylacetate in weight amount 25 to 37.5 ° / o in which Yippee vinyl acetate included in weight Quant # tions 14 to 34 ° / o or high pressure poly # ethylene in weight amount 25 to 40 percent.

Description

The invention relates to a thermoplastic material replacing the skin and textile in the form of a non-carrier foam sheet of thermoplastic ethylene polymers and optionally other thermoplastic polymers or polycondensates, fillers, reinforcing agents, plasticizers, stabilizers, antistatic agents and / or dyes, that the foamed foil consists of a mixture of ethylene / vinyl acetate copolymer in an amount of 37.5 to 75% by weight, in which vinyl acetate is present in a quantity of 5% by weight, and an ethylene / vinyl acetate copolymer by weight of 25 to 37.5% by weight, wherein the vinyl acetate is present in an amount of 14 to 34% by weight, and / or high pressure polyethylene in an amount of 25 to 40% by weight.

BACKGROUND OF THE INVENTION The present invention relates to leather and textile replacement materials for bag articles.

It is known to produce leather and textile replacement materials from polyvinyl chloride or polyurethanes. These materials are mainly used in the form of bonded materials with carrier materials, especially textiles. To prepare them, the carrier material is coated with a polyvinyl chloride paste, which is then heat-gelled, or a reactive mixture of polyisocyanate and a hydroxyl-containing polyester / polyether mixture and divalent alcohols are then reacted on the carrier material. This method of manufacture is an expensive processing technology.

Known materials based on polyvinyl chloride and polyurethane, replacing leather and textiles, cannot be used without a carrier, since the plastics themselves do not have sufficient durability. Carrier-based replaceable materials are not deep ductile.

In addition, polyvinyl chloride does not have sufficient breathability. Its decisive disadvantage is the migration of the plasticizer, it has a higher specific weight, even in the form of polyvinyl chloride foam, and at low temperatures it breaks or becomes brittle.

The purpose of the invention is to find a leather and textile substitute material characterized by low specific weight, high cold stability, good breathability, high flexibility, tackiness, good mechanical strength and durability, easy workability by deep drawing, welding and gluing.

SUMMARY OF THE INVENTION The object of the present invention is to make this skin and textile substitute material from thermoplastics.

This object is achieved by a skin and textile replacement material in the form of a non-carrier foam sheet of thermoplastic ethylene polymers and optionally other thermoplastic polymers or polycondensates, fillers, reinforcing agents, plasticizers, stabilizers, antistatic agents and dyes, characterized in that the foam sheet consists of a mixture of ethylene / vinyl acetate copolymers in a quantity of 37,5 to 70% by weight in which vinyl acetate is contained in a quantity of 5% by weight and of ethylene / vinyl acetate copolymers in a quantity of 25 to 37,5% by weight in which the vinyl acetate is present in an amount of 14 to 34% by weight, and / or high pressure polyethylene in an amount of 25 to 40% by weight.

The amount by weight of plasticizers contained in polyethylene is in the range of 2 to 30%, based on the amount by weight of polyethylene. It is also possible to use foamed films of hard or plasticized polyvinyl chloride.

The use properties of leather and textile replaceable materials can be varied when foamed foils are used which contain finely powdered or fibrous, inorganic or organic materials such as glass fibers, synthetic organic fibers, wood as fillers or reinforcing materials. flour or highly dispersed silicic acid.

The non-carrier foam sheet used as a material to replace leather and textile is produced by extrusion with foaming. The blend of polymer, nucleating agent and antistatic agent produced in the mixer is fed to an extruder. A liquid blowing agent is metered into the extruder cylinder. The polymer / blowing agent mixture, which is under high pressure, is extruded through a circular nozzle into a zone of lower pressure (ambient pressure) while foaming. The foamed hose is then pulled over the cooling mandrel, cut to the bottom with a separately driven blade, spreading and winding.

Preferably, a non-carrier foam sheet is used as the skin and textile replacement material, which is produced with blending of polymers, optionally together with polycondensates, fillers, reinforcing agents, plasticizers, stabilizers and / or colorants, together with nucleating agents and antistatic agents, and subsequent extrusion using a blowing agent.

The material of the present invention replacing leather and textile is well suited for the manufacture of bag articles. In order to improve the abrasion and scratch resistance, the polyethylene foam sheet is subjected to further surface treatment. The polyethylene foam sheet is passed through a heated zone, melting the upper surface while cooling the lower surface with a cooling coil. The melted surface is pressed into a compact layer by fitting. The temperature of the fitting roller is selected as high as possible and the cooling is carried out slowly and gradually to increase the degree of surface crystallization and thus the scratch resistance. The polyethylene foam sheet obtained is characterized by good scratch resistance, low dirtiness and aesthetic appearance. The surface is compact, non-porous, smooth, glossy and washable.

The manufacture of the bagging articles can be carried out in a technically simple manner by processing the polyethylene foam sheet immediately into molded articles by known thermoplastic molding processes.

Preferably, the manufacture of the baggage articles is made from one or more moldings. The facing surfaces of the articles can be patterned during molding by inserting matrices, for example in the form of expanded metal or reliefs, or by embossing the walls of the mold.

The foam structure of the inventive skin and textile replacement material is uniform and composed of fine cells. This material is characterized by low density, good breathability, good mechanical strength and flexibility. Due to its strength it is used without carrier. Its good flexibility at temperatures up to - 60 ° C ensures high cold strength. This material, replacing leather and textiles, is characterized by very good suppleness in foil and is suitable for the manufacture of luggage articles, footwear and outerwear. It can be easily processed by gluing, sewing, welding and deep drawing.

The invention is illustrated by the following examples in which percentages are by weight. Example 1

Ethylene-vinyl acetate copolymer containing 5% vinyl acetate is mixed with 0.1% citric acid, 0.1% sodium bicarbonate and 0.4% ethoxylated sperm oil derivative with fatty alcohol as antistatic agent Ca (product of VEB Chemische Werke Buna), and then fed to an extruder. A blowing mixture consisting of 80% dichlorodifluoromethane and 20% trichloronofluoromethane at a concentration of 5% is metered into the molten polymer-nucleation sensor at 14.71 MPa. The pressure in the press is 7.84 MPa, the device temperature is 90 ° C. A circular nozzle of 80 mm diameter and a cooling mandrel of 210 mm diameter are used. In the production of 101 kg / h, a foam film having a thickness of 2 mm and a width of 700 mm with a specific weight of 0.39 g / cm ^{3 is} obtained at the appropriate extraction. After the fit, the surface of the film is closed, free of pores, uniform and smooth, the foam structure of the film is uniform with fine cells. The foil has a character expressly like leather. It is very supple and has sufficient stability and strength to allow its use without carrier in the leather industry. The film can be squeezed without damage to obtain a face typical of the skin under equal stress.

Example 1 a d 2

The process of Example 1 was repeated under the same conditions except that a copolymer of ethylene with vinyl acetate containing 14% vinyl acetate was used as the polymer. The leather and textile replacement material obtained is more supple and softer at a somewhat lower strength and durability than the material prepared according to Example 1. Its specific weight is 0.41 g / cm ³ .

Example 3

The process of Example 1 was repeated under the same conditions except that a mixture of 75% ethylene / vinyl acetate copolymer containing 5% vinyl acetate with 25% ethylene / vinyl acetate copolymer containing 34% vinyl acetate was used. The product obtained at a somewhat lower strength is softer and more supple than the material prepared according to the procedure of Example 1.

Example 4

The ethylene / vinyl acetate copolymer containing 5% vinyl acetate is processed in an extruder. A 1.5% 5% solution of sodium chloride in tetrahydrofuran is metered into the molten polymer at 14.71 MPa. The film obtained has the pronounced skin character. It is very supple and has sufficient strength to allow carrier-free use in the leather industry. When squeezed, the film becomes particularly easy to obtain, as is typical of the skin under the same stress.

Example 5

Polymer blend consisting of 60% ethylene-5% vinyl acetate copolymer of 0.925 g / cm ³ and melt index 12 = 3 g / 10 min, and 40% polyethylene of 0.915 g / cm ³ and melt index 12 = 8 g / 10 min, mixed with 0.125% citric acid, 0.125% sodium bicarbonate and 0.4% ethoxylated sperm oil derivative with fatty alcohol (antistatic C2, product of VEB Chemische Werke Bunaj, based on 100 The blowing agent consisting of 80% dichlorodifluoromethane and 20% trichlorofluoromethane at a concentration of 5% based on 100% polymer is metered into the molten mixture of polymers and nucleating agent at a pressure of 14.7 MPa. 80 mm diameter round nozzles and 210 mm diameter cooling mandrel cooling and calibrating equipment are used.

8.33 MPa, temperature 95 ° C. At a material flow rate of 93 kg / h, a foam film having a width of approximately 650 mm, a thickness of 2.5 mm and a specific gravity of 0.28 g / cm ^{3 is} obtained at the appropriate draw-off speed. After fitting, the surface of the film is closed, free of pores and smooth, the foam structure is uniform with the fine cells. Example 6

The process of Example 5 was repeated under the same conditions except that a blend of polymers containing the polymer was used

(a) 37,5% ethylene-vinyl acetate copolymer, where the vinyl acetate content is 5%, with a specific gravity of 0,925 g / cm ³ and a melt index of 12 = 3 g / 10 min, bj 37,5% ethylene-vinyl acetate copolymer, where vinyl acetate is 14%, with a specific gravity of 0.935 g / cm ³ and a melt index of 12 = 5 g / 10 min; and

c) 25.0% polyethylene with a specific weight of 0.915 g / cm ³ and a melt index = 8 g / 10 min.

The foam density is 0.35.

Example 7

Under the same conditions, the procedure of Example 5 was repeated except that a blend of polymers containing the same was used

(a) 50% of ethylene-vinyl acetate copolymers, the proportion of vinyl acetate being 5% / o, a specific gravity of 0,925 g / cm ³ and a melt index of 12 = 3 g / 10 min;

(b) 40% of polyethylene having a specific gravity of 0,915 g / cm ³ and a melt flow index i2 = 8 g / 10 min; and

c) 2% polystyrene.

The specific weight of the foam obtained is 0.30 g / cm ³ .

Claims (1)

Material replacing leather and textile in the form of a non-carrier foam sheet of thermoplastic polymers of ethylene and optionally other thermoplastic polymers or polycondensates, fillers, reinforcing agents, plasticizers, stabilizers, antistatic agents and / or dyes, characterized in that the foam sheet consists of a mixture of ethylene copolymers with vinyl acetate in an amount of 37.5 to 75% by weight, in which vinyl acetate is present in a quantity of 5% by weight, and an ethylene-vinyl acetate copolymer in an amount of 25 to 37.5% by weight, in which vinyl acetate is present in a 14 to 34%, and / or high pressure polyethylene in an amount of 25 to 40 percent by weight. Severografia, n. P., Závod'7, Most price 2,40 Kcs;