SU138583A1 - The method of obtaining artificial leather - Google Patents

Description

It is known that the porous structure of artificial skin, which it needs to ensure adequate hygienic properties, creates nyTeiM introduction to the composition of plastics and rubbers of water-soluble salts, which at a certain stage of the process are washed out with water and create the necessary porosity of the material obtained.

However, due to the hydrophobic nature of the polymers used and the hydrophilic nature of the salts used (usually potassium chloride), the salt in the bulk of the polymer aggregates into large particles up to 300-500 microns in size. The pores formed after leaching of such particles significantly lower the mechanical strength of the resulting film and do not give the artificial skin the desired hygienic properties.

Therefore, the development of a formulation of artificial leather that does not contain hydrophobic polymers is of considerable practical interest.

Based on these considerations, a new, free from the above disadvantages has been developed, a method for producing artificial leather based on rubber compound using washable salts, in which high-strength hydrophilic carboxyl containing synthetic rubber SCS-30- is used as the main film-forming component.

The carboxylate rubber SCS-30-1 is a copolymer of butadiene, styrene and methacrylic acid 1 1 containing 10% methacrylic acid.

The salt introduced into this rubber is well distributed in it, does not aggregate, and after soaking leaves a pore size of 50-75 microns.

X 138583-2-

Pores of this size do not reduce the performance properties of artificial leather and give it high hygienic properties that approach the properties of natural leather.

Example. On the rolls, the mixture is prepared according to the following recipe (In parts by weight):

SKS-30-1100,0

 Ruberax 5.0

: sulfur1.0

Zinc Oxide3.0

«Magni 3.0 |

Stearic acid2,0

Tiuram1,0

Rosin5.0

Soot lampov 3.0

From the obtained mass, a 20–30% solution in butyl acetate is prepared and potassium chloride powder is introduced into it. The mass is mixed and applied to a spredip-machine on a fabric: kersey, velveton, and knitwear. After the shredding machine, the material is simultaneously embossed and vulcanized under pressure. Then, salt is removed from the material with water treatment, dried and applied on its surface shellac, casein or acrylic.

The resulting artificial leather is characterized by the following operational and hygienic nokazatel:

Tensile strength (strip 20x100) -100 kg

Elongation at break-18-20%

Repeated bending on the device "accordion -2 million

Abrasion on the instrument VNIIPIK-28 g / ket, cho

Vapor permeability on the device with a temperature difference of 7.8 MalcAi. hour Air permeability -0.36 ml1s. Water-holding capacity - 5.1%

Subject invention

The method of obtaining artificial leather based on a rubber mixture containing synthetic rubber and with the use of washable salts, characterized in that the main film-forming agent is carboxyl rubber SKS-30-1.

cycles (almost unchanged)