The way we produce leather

 

(57) Abstract:

The method relates to the production of leather for the uppers from the skins of cattle. Semi-finished leather is subjected to dyeing. It is greased with the fat consumption of 4-5% by weight of semi-finished product, counting for 100%, and is treated with a composition containing a hydrocarbon fraction C12-C40, an aqueous solution of polymethylacrylate (20%), polymethylsiloxane liquid, nonionic emulsifier, diamides unsaturated C12-C20- dicarboxylic acids and water. The method improves the quality of skin. table 2.

The invention relates to the leather industry and can be used in making leather for Shoe upper from the skins of cattle.

A method of processing leather, including simultaneous dyeing, greasing, filling the latex of copolymer of vinylidene chloride with vinyl chloride content 62 - 68% vinylidenechloride of 1.2 to 1.3% by weight of shaved leather and then the retanning Syntan /1/.

The disadvantage of this method is that using it for filling leather latex of a copolymer of vinylidene chloride with vinyl chloride, postponed in the surface layers of the dermis due to the large time is ptx2">

The closest analogue of the proposed technical solution is the way to making skins, comprising dyeing the material greasing with the consumption of fat, 8 to 10% by weight of semi-finished product, counting for 100%, and a processing composition containing, by weight. %: alkyl/meth/acrylate long chain 20 - 70, a monomer with a special polysiloxane group 1 - 60, polyamide unsaturated C4-C6- dicarboxylic acids 20 to 35 and water the rest /2/.

This method gives the opportunity to make a skin with a hydrophobic effect, but you can't get evenly filled in all topographical areas.

The technical result of the invention is to improve the quality of the leather.

This result is achieved in that in the method of manufacture of leather, comprising dyeing the material greasing and processing composition containing an acrylic polymer, polysiloxane, amides of unsaturated dicarboxylic acids and water, greasing is carried out at the expense of fat 4 - 5% by weight of semi-finished product, counting for 100%, in the processing composition further added hydrocarbon fraction C12-C40and nonionic emulsifier, as the acrylic polymer, it uses an aqueous solution of polymethylacrylates - diamides of unsaturated C12-C20dicarboxylic acids in the following ratio of components, wt.%:

The hydrocarbon fraction C12-C40- 15 - 25

An aqueous solution of polymethylacrylate (20%) - 20 - 30

Polymethylsiloxane liquid - 5 - 10

Neinogennye emulsifier - 1 - 8

Diamides of unsaturated C12-C20dicarboxylic acids - 5 - 8

Water - the Rest

A distinctive feature of the proposed method is that the use of a processing composition in the form of an aqueous emulsion allows him fuller and deeper understanding of the structure of the dermis. The use of the composition as acrylic polymer aqueous solution of polymethylacrylate, as polysiloxane - polymethylsiloxane fluid, as amides of unsaturated dicarboxylic acid - diamide unsaturated C12-C20dicarboxylic acids, as well as the additional introduction of the hydrocarbon fraction C12-C40and neinogennye emulsifier that allows the composition to selectively fill a topographic skin, aligning them on the thickness and properties. In addition, included in the composition of the hydrocarbons have a fattening effect, which reduces the consumption of fats mainly when the LM is wt.%, an aqueous solution of polymethylacrylate less than 20.0 wt.%, polymethylsiloxane fluid less than 5.0 wt.%, nonionic emulsifier is less than 1.0 wt. %, diamide unsaturated WITH12-C20dicarboxylic acids less than 5.0 wt.% and less water 32,0 wt.% is not possible to obtain uniformly filled in topographic areas of the skin.

The introduction of these components, respectively, more to 25.0 wt.%, more than 30.0 wt.%, more than 10.0 wt.%, more than 8.0 wt.%, more than 8.0 wt.% and more of 41.0 wt. % does not allow to obtain stable in time the emulsion, in addition, leads to the stiffness of the leather.

Polymethylacrylate produced by the method of emulsion polymerization of methacrylic acid. The synthesis is carried out at a temperature of 80 - 100oC for 4 to 5 h in the presence (by weight of monomer) 3% emulsifier (alizarin oil) and 0.5 to 1.0% of the initiator (benzoyl peroxide).

Diamides of unsaturated C12-C20dicarboxylic acids obtained by polycondensation reaction of unsaturated C12-C20dicarboxylic acids with diethanolamine in a molar ratio of 1:1.

The composition is prepared as follows.

The hydrocarbon fraction C12-C40at a temperature of 75 - 80omixed with water and nonionic e is 2-C20-dicarboxylic acids. The resulting mixture is cooled to 35 - 40oand with thorough stirring into it enter polymethylsiloxanes liquid and 20% aqueous solution of polymethylacrylate.

The method is as follows.

The semi-finished product obtained by known techniques from the skins of cattle, is subjected to the dyeing and greasing with the consumption of fat 4 - 5% by weight of semi-finished product, counting for 100% and treated in the same bath for 40 - 50 min following composition, wt.%:

The hydrocarbon fraction C12-C40- 15 - 25

An aqueous solution of polymethylacrylate (20%) - 20 - 30

Polymethylsiloxane liquid (ICP - 150-350) - 5 - 10

Nonionic emulsifier (Previal) - 1 - 8

Diamides of unsaturated C12-C20-dicarboxylic acid - 5 - 8

Water - the Rest

The flow rate of 2 to 8% by weight of the semifinished product. Further processes and operations carried out by standard methods.

Specific options structure for implementing the method and parameters of fatliquoring presented in table. 1.

Quality indicators received skin compared to skin on the prototype are presented in table. 2.

Using the proposed method pozvoliauschue and shalkovity the fretboard.

The method of manufacture of leather, comprising dyeing the material greasing and processing composition containing an acrylic polymer, polysiloxane, amides of unsaturated dicarboxylic acids and water, characterized in that the creasing is carried out at the expense of fat 4 - 5% by weight of semi-finished product, counting for 100%, in the processing composition further added hydrocarbon fraction C12-C40and nonionic emulsifier, as the acrylic polymer, it uses an aqueous solution of polymethylacrylate, as polysiloxane - polymethylsiloxane liquid, and amides of unsaturated dicarboxylic acid diamides unsaturated C12-C20-dicarboxylic acids in the following ratio of components, wt.%:

The hydrocarbon fraction C12-C40- 15 - 25

An aqueous solution of polymethylacrylate (20%) - 20 - 30

Polymethylsiloxane liquid - 5 - 10

Nonionic emulsifier - 1 - 8

Diamides of unsaturated C12-C20-dicarboxylic acid - 5 - 8

Water - Ostalnoe

 

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Method of finishing // 2127763

The invention relates to leather production, in particular for dyeing and greasing processes, and can be used in making leather for various purposes

The invention relates to leather production, in particular for dyeing and greasing processes, and can be used in making leather for various purposes

The invention relates to leather production, in particular for dyeing and greasing processes, and can be used in making leather for various purposes

FIELD: leather industry.

SUBSTANCE: semifinished product is degreased, neutralized, dyed, and lubricated. Dyeing is performed in two washing-interrupted steps with anionic black dye consumed in amount 0.5-0.6% of the weight of semifinished product in each dyeing step. Lubrication is followed by retannage with chrome tanner in amount 0.6-1.0% of the weight of semifinished product (calculated for chromium oxide) and treatment with 0.8-1.0% of spindle oil.

EFFECT: achieved deep black color and high performance characteristics.

1 tbl, 5 ex

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