SU1420021A1 - Method of finishing natural leather - Google Patents

Abstract

This invention relates to the leather industry and makes it possible to improve the performance properties of the skin and simplify the technology. On a semi-finished product with a natural front surface, developed according to a standard procedure, the compositions of pigmented soil and topcoat are applied successively, the composition of each of which contains a mixture of polymer films, pigment concentrate, additives and water, with intermediate and final drying. Then, pressing, pressing and fixing with nitroemulsion lacquer is carried out. The composition of each layer contains as one of the polymer film formers. butadiene, methyl acrylate, acrylonitrile, and methacryloic acid copolymer latex at. the following ratio of monometers, respectively, MACH.: 40: 45-55: 5-13: 0.2-1 with the rigidity of the polymer 40-70 And (BMAM). The composition of the pigmented soil contains the following components, wt%: latex BAM-7-10J acrylic dispersion 1-2; 8-10 pigment concentrate; 20% wax emulsion 2-4 and water the rest. The composition of coating paint contains the following components, wt%: latex BAM-6-8; acrylic dispersion 2-3; pigment concentrate 10-15; 20% wax emulsion 4-8; Ammonium caseinate 0.6-1.0 and water the rest. 1 tab. with s f

Description

The invention relates to light industry and can be used in leather production for leather finishing.

The purpose of the invention is to improve the performance properties of the skin and simplify the technology.

According to the proposed method of finishing leather by successively applying layers of pigmented soil and pokratny paint, the composition of each of which includes a mixture of polymer film-forming agents, pigment concentrate, additives and water, with intermediate and final suppression, pressing, pressing and subsequent fixing with nitroemulsion varnish in the composition of each layer As one of the polymeric film formers, a latex of a copolymer of budatien, methyl methacrylate, acrylonitrile, and methacrylic acid is used for the following cement ratio of monomers, respectively, wt.%: 40: 45-55: 5-15:: 0.2-1 with a polymer hardness of 40-70 N and the composition of the pigmented soil contains these components in the following ratio, wt.%:

Latex copolymer of butadiene, methyl methacrylate, acrylonitrile, and methacrylic acid (calculated on the dry matter) 7.0-10.0

Acrylic dispersion. (In terms of

dry substance) 1.0-2.0 Pigment concentrate8, 0-10.0

Wax emulsion (20%) 2.0-4.0

WaterEverything

The composition of primer paint - in the following ratio, wt.%: Latex copolymer of butadiene, methyl methacrylate, acrylo-Sch1-trch1a and methacrylic acid (in terms of dry substance) 6.0-8.0

Acrylic dispersion 2.0-3.0 Pigment concentrate 10, 0-15.0 Wax emulsion (20% -n.a). 4.0-8.0

0

five

0

0

five

0

five

0

five

Ammonium Caseinate

(in terms of

dry matter) 0.6-1.0

WaterEverything

Used latex get by

next technology, ma.ch .: Butadiene40

Methyl methacrylate 45-55 Acrylonitrile5-15

Methacrylic acid (MAC) (introduced as a 10% aqueous solution into a polymerizable emulsion with 70–80% conversion of basic monomers 0.2–1.0

Tert-dodecyl mercaptan in the original emulsion. 0.3 Tert-dodecylmercaptan with a conversion of 70-80% of monomers in the form of a 5% emulsion into an emulsifier torus -0.05

Sulfonol NP-3 3,0 Hydroperoxide

isopropylbenzene O, 1 Rongalit0.05

Trilon B0.05

Leucanol 0.5

Water150

Polymerization temperature 20-22 С

before conversion 70-80%. After entering the MAC

and tert-dodeschmercaptan -.

The conversion of monomers is almost complete, i.e. 100%.

Latex is subjected to degassing and deodorization (removal of small amounts of unpolymerized monomers, and impurities to them) at 60-70 ° C under vacuum for 3-5 hours.

The finished latex is characterized by complete resistance to mechanical stress, resistance to the introduction of all ingredients in the preparation, primers and coating paints. The latex-based film has a tensile strength of 14.8 Sha with a relative elongation of 590% and a polymer rigidity (Defoe) 60 N.

Example 1. Handle semi-finished product with a natural front surface, developed by the standard method.

Apply on a brush aggregate 2 times the pigmented soil with between. 1A20021 full-time and final drying of the following composition, mass%: Pigment concentrate8, 0 20% latex of a copolymer of butadiene, methyl methacrylate, acrylonitrile and methacrylate acid, Yu in the following ratio of components, in parts: 40:50:10 : 0.2 with the rigidity of the polymer Bon 40.0 (in

dry matter - 20 8.0)

10.0 (in terms of 25 dry matter - 2.0)

20% polymethyrcrylate dispersion

20% wax emulsion 3.0

Water39,0

Then the skin is pressed on a hydraulic press at a pressure of 1.0 MPa, after which it is applied on a sintering aggregate 3 times pokratnuyu paint, including, wt.%:

Pigment concentrate 12, 0 20% g. Latex of a copolymer of butadiene, methyl methacrylate, acrylonitrile and methacrylic acid ;; oty in the following ratio of components, w.ch .: 40: 50: 10: 0.2 with polymer rigidity

bon

40.0

20% polymethylacrylate dispersion

(in terms of dry substance - 8.0)

15.0 (in a 10% solution of ammonium caseinate

20% wax emulsion Water

those dry matter 3,0)

6.0 (in terms of dry substance 0,6)

5.0

22.0

Then, the coating is fixed with ENC-542 nitro-emulsion lacquer on the spray unit and the skin is pressed at 75 ° C and 1.1 MPa pressure.

Example2. On the skin with a polished facial surface, developed from the easy by the standard procedure, the coating compositions of the following compositions are applied analogously to Example 1.

0

five

0

Pigmented soil, Pigment concentrate

20% latex of a copolymer of butadiene, methyl methacrylate, acrylonitrile and methacrylic acid, m.ch.ch .: 40: 50: 10: 1.0 with a polymer hardness of 40N

% by weight: 10.0

five

0

20% acrylic dispersion

five

20% wax

emulsion

Water

35.0 (in terms of dry substance 7.0)

5.0 (based on dry substance 1.0)

4.0 46.0

5142002

Pour paint, wt.%: Pigment concentrate 13.0

20% butadiene copolymer latex, methyl methacrylate, onitrile acryl,

methacrylic kit-.10

lots, ma.ch. 40: 50: 10: 1.0 when the rigidity of the polymer is 40Н35.0 (in terms of dry matter

7.0) 20 20% dispersion

polymethyl methacryl & 10,0 (in terms of 25 dry

substance

. 2.0)

10% solution30

ammonium caseinate 8.0 (in terms of dry substance 0.8)

20% wax emulsion 6.0

Water 28.0. Perm 3. On skins with shlifonoy front surface, vybonnye from dexterity easy on a typical odike, apply the same pokrshnye compositions of the following tavov.

Pigmented soil, wt.%: Pigment co-centrate 10.0

20% latex copolymer of butadiene, methylmethacrylate, acrylonitra and metac-

rilic acid, mac

40: 55: 5: 0,8 with poly35 hardness

40

45

SO

g

0

five

0

measure 52 N

five

0

five

O

20% polymethylacrylate dispersion

45.0 (in terms of dry substance 9.0)

5.0 (based on dry substance 1.0)

20% wax emulsion 4.0

Water .36.0

Surface paint, wt.%: Pigment concentrate -15.0 20% latex of a copolymer of butadiene, methyl methacrylate, nitrile acrylo and.

methacrylic acid, mac 40: 55: 5: 0,8 when the rigidity of the polymer 52N 30.0 (in terms of dry matter 6.0)

20% polymethylacrylate dispersion 15.0 (in terms of dry substance 3.0)

10% solution

Ammonium Caseinate 10.0 (based on dry substance 1.0)

20% wax emulsion 7.0

Water23

PRI me R 4. The method is analogous to example 1. The difference consists in the composition

7 ° 142002 film-forming latex properties. The coating compositions have the following composition.

Pigmented soil, wt.%:

Pigment concentrate8, 0

20% latex

copolymer of butadiene, methylmetak-u

cilata, acrylonitrile and methacrylic

acido, ma.ch .:

40:45: 15: 0.2 at

stiffness Polina-15

ra 70 H40.0 (in terms of dry matter - 20 8.0)

20% wax

emulsion 2,0

20% dispersion 25

polymethylacrylate 10.0 (in terms of dry substance h-30 2.0)

Water40.0

Coating paint, wt.%:

Pigment con-35;

centrat10.0

20% latex

copolymer of butadiene, methyl methacrylate, acrylo-401

nitrile and methacrylic acid,

ma.ch .: 40:45:15:

: 0.2 with stiffness

polymer 7ON40,0 (in pe- 45

 reference to bzsoe substance 50 8.0)

20% dispersion

polymethyl acrylate

15.0 (in terms of 55 dry)

3,0)

10% solution: aNMOHHH caseinate 6.0 (based on dry substance 0.6)

20% wax emulsion 5.6

Water 24.0.

PRI me R 5. The method is similar to example 1. The difference consists in the composition of the ground floor and the cover coat.

Pigmented soil, wt.%: Pigment concentrate8, 0 20% methyl methac-butadiene copolymer latex. of cilata, acrylonitrile, and methacrylic acid, m.ch .: 40:50: 10: 0.2 with a polymer hardness of 60Н 50 (10 in

in terms of dry matter)

20% polymethylacrylate dispersion 5.0 (in terms of cjTcoe substance 1.0)

20% wax emulsion 2.0

Water. 35

Coating paint, wt.%: Pigment concentrate 12 20% latex of a copolymer of butadiene and methacrylic acid, methyl methacrylate, acrylate, wt.ch.: 40: 50: 10: 0.2 with the rigidity of Bon 40 polymer (in pe20% - on polymethylacrylate dispersion

15

142002110

resche to the coating paint, the composition of each of which includes a mixture of polymer dry film-forming agents, pigment concentrate, additives, and water, with a period of accurate and final drying, drawing, 8.0) pressing and fixing with nitroemulsion varnish, distinguished by the fact that, in order to improve the performance properties of the skin and

10% ammonium caseinate solution

(in terms of, Q those dry matter 3,0)

6.0

20% wax

emulsion

Water

A, O 23.0

15

(in terms of dry substance 0,6)

20

25,

simplification of the technology, in the composition of each layer, as one of the polymeric film formers, use is made of butadiene, methylmethacrylate, acrylonitrile, and methacryloic acid copolymer latex in the following ratio of monomers, respectively, wt. 0.2-1 with a polymer hardness of 40-70 N, while the composition of the pigmented soil contains these components in the following ratio, wt.%: Latex copolymer of butadiene, metst-methacrylate, acrylonitrile, methacrylate acid (in terms of dry substance) 7, 0-10.0. Acryl var Yers (in terms of dry substance) ljO-2,0 Pigment concentrate 8.0-10.0 Wax emulsion (20%) 2.0-4.0 Water The rest and the composition of primer paint in the following ratio of components, wt. .%:

Indicators of the properties of coatings on leather, finished according to the proposed method, are given in the table.

The coatings obtained by the proposed method on the skin are characterized by good performance properties: they have high resistance to repeated bending and wet friction, good adhesion of the coating to the skin and good hygienic properties. At the same time, the coatings have an excellent appearance, leather-like to the touch. The absence of a chlorine-containing polymer in the polymer binder (dispersion MX-30) contributes to the preservation of the good physicomechanical properties of the coating and the good appearance for a long time.

In addition, according to the proposed method, the finishing process is simplified, since the number of compositions used for finishing is reduced (with the exception of non-pigmented soil).

Claims (1)

Invention Formula The method of finishing leather, including the sequential application of layers of pigmented soil simplification of the technology, in the composition of each layer, as one of the polymeric film formers, use is made of butadiene, methylmethacrylate, acrylonitrile, and methacryloic acid copolymer latex in the following ratio of monomers, respectively, wt. 0.2-1 with a polymer hardness of 40-70 N, while the composition of the pigmented soil contains these components in the following ratio, wt.%: Latex copolymer of butadiene, metst-methacrylate, acrylonitrile, methacrylate acid (in terms of dry substance) 7, 0-10.0. Acryl var Yers (in terms of dry substance) ljO-2,0 Pigment concentrate 8.0-10.0 Wax emulsion (20%) 2.0-4.0 Water The rest and the composition of primer paint in the following ratio of components, wt. .%: Butadiene copolymer latex, methyl methacrylate a, acrylo-. Nitrile, methacrylic acid (in terms of dry substance) 6.0-8.0 Acrylic dispersion (in terms of dry substance) 2E0-3, O Pigment concentrate 10, 0-15,0 Wax emulsion (20%) 4, 0-8.0 Caseinate (in terms of dry substance) 0.6-1.0 Water Else Resistance to repeated bending, cycles, Resistance to wet friction, number of turns Adhesion, N / m 50,000 50,000 320 340  50,000 350 Compiled by E. Bobkova Editor And, Segl nick Tehred A. Kravchuk Proofreader L. Pilipenko Order 4291/25 Circulation 368 VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Subscription