Method of increasing wear resistance of clothing parts

FIELD: light industry.

SUBSTANCE: powdered thermoplastic polyurethane with reduced melting point is applied on fur article parts in most wear place, said polyurethane being prepared from 4,4-diphenylmethanediisocyanate, poly(butylene glycol adipate) and 1,4-butanediol serving as chain extension agent. Thus treated part is then pressed at 64-75°C and remained to lie.

EFFECT: improved quality of fur articles due to increased hair-to-skin tissue binding strength, resistance of hair coat against wear, and increased lifetime of clothes.

 

The invention relates to the fur industry and can be used in the manufacture of clothing made of natural fur.

Known methods of improving the wear resistance of fur semi-finished products, which consists in hardening due hair with Koshevoy cloth on the finished collars from skins of foxes and Fox with the use of carboxyl-containing copolymers of methyl acrylate and butyl acrylate with methacrylic acid /emulsion of BMP-3/ and silicone liquids NGL-94 /1/, polyisobutylene adhesives and dispersions /2/.

The closest analogue is a method of skin treatment with fluorine-containing polymers /3/, including the application of polymer extrusion and aging. The disadvantage of this method is the increased melting point of the polymer, applying it over the entire surface of the part, as the result of high consumption of film-forming polymers increased stiffness and fur semi-finished product, uneven application.

The technical result is to increase the quality of fur products by increasing wear fur semi-finished product.

This technical result is achieved in that in the method of increasing the wear resistance of clothing made of natural fur, including the application of the polymer, followed by pressing and aging, according to the invention, as the polymer used powder thermoplastic the first polyurethane (TPU) with a low melting point, obtained on the basis of:

-4,4-diphenylmethanediisocyanate (DHS) CH2(C6H4NCO)2;

-polybutyleneterephtalate (PBA)

-1,4-butanediol as chain extension.

Polyurethane proposed chemical composition refers to the amorphous-crystalline polymers with sufficiently perfect supramolecular structure. The degree of microphase separation of the powdered thermoplastic polyurethane low, easily and quickly transformed into a plastic state.

The proposed method can improve the wear resistance of the finished fur products especially from “teklif” kinds of fur at the stage of manufacture. In areas of maximum wear on the bottom of the sleeves, cuffs, hem, bends, collars, etc., use local application of a powdered thermoplastic polyurethane with a given set of properties.

Used powdered thermoplastic polyurethane is characterized by a low content of butanediol (ratio of polyester (PE) - to-butanediol (BD) - PE:BD=1:0.1 by weight. parts) and isocyanate index NCO:OH=0,96:1 wt. parts, a characteristic viscosity in the range of 0.37-of 0.42 DL/g

The advantage of powder thermoplastic polyurethane is reduced melting temperature (47°C), which is achieved by variation of the characteristic viscosity is also high adhesion and the ability to penetrate into the dermis of any kind of fur, thereby fixing the bulbs in the hair her bags papillary layer; to form an adhesive connection with Koshevoy cloth of any kind of fur. Powdered thermoplastic polymer withstands the whole complex operational impacts, while maintaining the integrity of adhesive joints, meet sanitary-hygienic requirements.

The technological process of processing the leather items of clothing made of natural fur is made according to the following scheme:

On the leather parts of fur products in areas of maximum wear evenly in a thin layer using a special device based 25-28 g/m2put powdered thermoplastic polymer. After applying the powder of thermoplastic polymer item top cover Teflon gasket brand 492, GOST 24222-80, thickness 50 μm, in order to avoid sticking to the top pillow press. In the future produce pressed parts when installed options:

- pressing time is 40-45 sec;

- temperature extrusion - 65-75°C;

- pressure press - 0.02 MPa.

After pressing the treated parts of the product removed from the die cushion and laid on the table for cooling and aging within 24 hours.

Processing powdered thermoplastic polymer improves the quality of fur semi-finished product: fixed hair in the dermis (the strength of the ox is sa with Koshevoy cloth increases in 3 times), increases the resistance of hair to abrasion 1.5 times the tensile strength of the leather is increased by 2 times. You can also make comparable wear resistance of individual sections of the product with the durability of its basic parts, which in turn increases the service life of service in General for 1.5 season. As a result of reduced elongation (elasticity decreases by 15-20%) and slightly increasing the stiffness-treated adhesive areas, the opportunity to abandon the traditional laying of the edges along the lines of the Board, the bottom product and sleeves to prevent them from stretching and save the attached form in the process of wearing. This saves material, reduces the overall weight and complexity of processing in the production process.

The list of sources used:

1. Dubinin PS, Vinokurova IVAN Strengthening communication hairline leather ready collars of fur foxes silver-black, and Fox. - Sat. scientific papers ZNIIK, 1974. - P.42-45.

2. Aronin YU.N., Ephraim PAY other Technology fur. - M: Light industry, 1974.

3. The Japan Patent. Application No. 1123981 EPO IPC 7 14 11//00.

The method of increasing the wear resistance of clothing made of natural fur, including the application of the polymer, followed by pressing and aging, characterized in that the quality is the firmness of the polymer used powdered thermoplastic polyurethane with a low melting point, obtained on the basis of 4,4-diphenylmethanediisocyanate, polybutyleneterephtalate, 1,4-butanediol as chain extension.



 

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