SU901271A1 - Composition for finishing natural leather - Google Patents

Description

one

The invention relates to the leather industry and can be used in the finishing of natural leather.

The closest in technical essence and achievable technological effect to the proposed is a composition for finishing natural leather, including pigment concentrate, casein solution, wax emulsion, film former, emulsifier, ethyl alcohol and water. In the known composition, methyl methacrylate and acrylic acid latex based on t-IX-30 dispersion and film production company Ital, which are acrylic copolymers (Rubber 6509 and Rubber 6582), are used as film formers, and as the "1 - 1-15% emulsifier" - a mixture of ionic and non-ionic emulsifiers in an alcohol-aqueous medium

The drawbacks of the treatment with the known composition are the sufficient speed of impregnation of the leather, and the skin is characterized by uneven distribution of the polymer in the structural elements of the dermis, low adhesion of the coating, low resistance of the coating to wet friction and repeated bending, and finally, incomplete elimination of the defects of treated leather, wrinkles and perfume.

The purpose of the invention is to increase the quality of leather.

This goal is achieved by the fact that the composition for finishing natural leather, including a pigment concentrate, a bureaucratic solution, a wax emulsion, a film-forming agent, an emulsifier, ethnyl alcohol and water, contains a water dispersion of chloroprene copolymer with methacrylic acid and 20 dichloro-butadiene –domer, as the film-forming agent. or butnl methacrylate (in the ratio of comonomers, respectively 88-73: 2-7: 10-20), and as

3901

Mulgator - pentadecylsulfonate atri at the following ratio of components, wt.h .:

Pigment concentrate 100 Casein solution, calculated on the dry residue) 1.5-2.0 Wax emulsion (based on the dry residue) 3.2-5.0 Aqueous dispersion of chloroprene copolymer with methacrylic acid and comonomer dichlorobutadiene, or methyl methacrylate, or butyl methacrylate (in terms of dry residue) 60-70 sodium pentadecylsulfonate emulsifier E-30) 1.2-2.0 ethyl alcohol 2.64-4.3

Water 320-350

The emulsion copolymerization of chloroprene with methacrylic acid and the third comonomer (dichlorobutadiene, ethyl methacrylate, butyl methacrylate) is carried out at 40t2 ° C in the presence of known radical initiators of emulsifiers. The composition of the initial emulsion for copolymerization, parts by weight:

Chloroprene 88-73

Metacryl

acid2-7

Third comonomer

(dichlorobutadiene,

methyl methacrylate

butylmethacrnlat) 10-20

Emulsifier E-30 3-4

Emulsifier OP-10 1-1,2

Potassium persulfate 0.35-0.40

Water140 -150

After completion of the polymerization process, the stabilizer NG-22-46 b2,2-methylenebis-4-methyl-6-tertiary butylphenol) or P-23 (2,4,6-tri-tertiary butylphenol) is added to the latex at the rate of 2- 3 weight.h. per 100 weight parts polymer

The proposed pre-soil possesses high impregnating properties, which are due to the complex of colloidal-chemical characteristics, relative viscosity to Denlop and / b 1.6; surface tension 36 ± 2 mN / m; globular particle size

714

600-800 A) used in the composition of the pre-ground latex, and the use of emulsifying systems (a combination of ionic - sodium alkyl sulfonate

(emulsifier E-30) and non-ionic ethoxylated alkylphenol (OP10), both in the process of water-emulsion polymerization of chloroprene, and as part of the pre-soil E-ZO). As a result of the use of the proposed primer composition, the quality indicators of the finished skin — the adhesion of coatings, their resistance to wet friction and repeated bending, elasticity and elimination of wrinkles and perfume. the effect of sewing the skin layer on

0 Specific examples of the composition for the finishing of natural leather are summarized in Table 1,

B as a control option for finishing leather using a well-known composition, mac.ch .:

Pigment concentrate 100

Casein solution

(10%) 18

Wax emulsion

С20% -на) 21

Dispersion MX-30

(20% on 7300

Rubber 6509-acrylic

copolymer (26.4%) 13

6582 acrylic rubber

copolymer C40% iy 16

Penetrator 6507 mix

ionic and non-ionic emulsifiers

fl-15%) in an alcohol-drain system) 4.5

The skin treated with compounds I-I2, have the physico-mechanical parameters presented in table 2.

The tests are carried out by the method of comparable halves of the skin.

The skins trimmed by the proposed cflstav, in comparison with leathers of known varnishes, are characterized by considerable resistance of the coating to wet friction and repeated bending, high adhesion of the coating to skin. The high effect of attaching the facial layer of the skin is due to the presence of the functional groups of the molecular chain of the used ternary copolymers of chloroprene. The rigidity of the leather treated with the proposed composition is 15% lower than the rigidity of the leather treated with the known. . 901271, 6 The application of the proposed composition allows to increase the grade of the finished products.

table 2

Proposed

П 90127112

Ethyl alcohol 2.64-4.3dl top of shoes made of animal hides, water 320-350 for large cattle, opoiSources of information, information, goat, goats, which were taken into account during examination and pigskins Minleg1. Annexes to the methods of production-j industrial Arm Nska SSR, 10.01.79

chromic leathers of equal thickness (prototype).

Claims (1)

<claim-text> <table border = "1"> <tbody> <tr> <td> Casein solution (dry basis) </ td> <td> 1.5-2.1 </ td> </ tr> <tr> <td> Wax emulsion </ td> <td> </ td> </ tr> <tr> <td> (in terms of dry residue) </ td> <td> 3.2-5.0 </ td> </ tr> <tr> <td> Chlo - </ td> <td> copolymer water dispersion </ td> </ tr> <tr> <td> roprene with methacrylic acid and comonomer dichlorobutadiene, or methyl methacrylate, or butyl methacrylate (calculated on the dry residue) </ td> <td> 60-70 </ td> </ tr> <tr> <td> Pentacapsulphonate sodium </ td> <td> 1.2-2.0 </ td> </ tr> </ tbody> </ table> <claim-text> π </ claim-text> <claim-text> ethyl alcohol 2.64-4.3 </ claim-text> <claim-text> Water 320-350 </ claim-text> <claim-text> Sources of information taken into account in the examination </ claim-text> <claim-text> 1. Applications to methods of production of chromic leather of equal thickness </ claim-text> <claim-text> 901271 12 </ claim-text> <claim-text> for the top of shoes from cattle hides, carpets, outgrowths, goats, sheepskins and pigskins. The Ministry of Light Industry of the Armenian SSR, 10.01.79 (prototype). </ Claim-text>