SU1475920A1 - Method of filling semifinished leather product - Google Patents

Abstract

The invention relates to the leather industry and improves the quality of the semi-finished product by increasing the amount of filler added and reducing the shrinkage of the leather during drying. The filling of the leather semi-finished product is carried out by treating it with a dispersion of polyvinyl chloride. As the dispersion medium, a hydrophobic liquid is used, for example an organic solvent, fats, or a water-in-oil emulsion. 2 hp ff, 1 tab.

Description

I

The invention relates to the leather industry and can be used in the production of leather for uppers.

The purpose of the invention is to improve the quality of the semi-finished product by increasing the amount of filler injected and reducing the shrinkage of the leather during drying.

The essence of the invention is that the filling of the semi-finished product is carried out by dispersing the polyvinyl chloride in a hydrophobic liquid, which uses organic solvent, fat, a mixture of fats or a water-in-oil emulsion, while the consumption of polyvinyl chloride is 4-8% by weight of the semi-finished product, and the treatment is carried out at 40-60 ° C and LCD 0.1-0, 5.

In the implementation of the proposed method, the filler particles are separated

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from each other and from the structural elements of the skin to be filled with hydrocarbon shells of the hydrophobic medium. As a result, when polyvinyl chloride from the hydrophobic medium is injected into the skin, the intermolecular interaction and friction of the particles on the structural elements are significantly reduced, therefore, the ability of the filler to penetrate into the structural elements, such as fiber bundles, increases, and the maximum amount that can be introduced into the dermis thickness increases.

The following organic solvents can be used as a dispersion medium: trichlorethylene, perchlorethylene, wai-spirit.

Fats are used: synthetic fat, sulfonated fish oil, paste VNIIZH; oils: industrial, alizarin or castor.

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The method is carried out as follows.

Powdered polyvinyl chloride grade PVCE-6250-Ж is mixed into a hydrophobic liquid, mixed and the mixture is treated with a semi-finished product at 40-60 ° C for 30-60 minutes, with an LCD of 0.1-0.5, after which the samples are dried in a free condition.

The method is explained by the following specific examples of its implementation. Example 1. Raw materials of cattle are processed according to a known method. A mixture of fat and powdered polyvinyl chloride is fed into the drum with tanned semi-finished product.

Processing parameters: temperature 40 ° С, duration 1 h, LC 0.1.

The composition contains the following components, in% by weight of the semi-finished product: Synthetic fat3,25

Industrial

oil3.25

PVC PVC-6250-Zh4,0 Polyvinyl Chloride

At the end of the filling process, the bath development is 100%, the increase in the thickness of the semi-finished product is 8.6%.

Example 2. Raw materials of cattle are treated as described in Example 1. A water-in-oil emulsion is used as the hydrophobic liquid. An emulsion is poured onto the pressed picelled pendants in the drum, into the hydrophobic phase of which powdered polyvinyl chloride is introduced.

The composition contains the following components,% by weight of the semi-finished product: Aqueous solution of chrome tanning counted on Cg703 2.5 Industrial oil 3.0 Synthetic fat3.5

Polyvinyl PVCE-6250-Zh6,0

Based on LCD 4 0.3 and the emulsion phase ratio of 3: 1, the required amount of chrome, tanning agent (2.5% of the weight of the semi-finished product) is brought to the required amount of hydrophilic phase of the emulsion with water. The emulsion thus prepared is fed to the drum on the kel of the LCD at 0.3, temperature 40 ° C, duration

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processing 30 min. The bath run is complete, the increase in the thickness of the semi-finished product is 9.8%.

c. Example Z. Cattle raw materials are treated as described in Example 1. Powdered polyvinyl chloride in a hydrophobic state is fed to a tanned semi-finished product. liquids, which is used as white spirit.

The composition contains the following components,% by weight of the semi-finished product:

White spirit32

5Polyvinyl chloride

PVC-6250-G8

Processing parameters: LCD 0.4, temperature 40 ° С, duration 1 h.

0The bath is full. An increase in the thickness of the semi-finished product is 9.8%.

Example 4. The raw materials of cattle are treated as described in example 5 of Example I. A mixture of fats with powdered polyvinyl chloride is fed to a drum with a tanned semi-finished product. Processing parameters: temperature 40 ° С, duration 1 h, LC 30 0.1

The composition contains the following components,% by weight of the semi-finished product: Synthetic fat3,25

Industrial oil 3,25 5 Polyvinyl chloride

PVC-6250-G4.0

At the end of the filling process, the recovery of the bath is 100%, an increase in the thickness of the semi-finished product is 0 8.6%.

Example 5. Raw materials of cattle are treated as described in example 1. The semi-finished product after the tanning process is fed with dispersion of powdered polyvinyl chloride in white spirit.

The composition contains the following components,% by weight of the semifinished product: Polyvinyl PVCE-6250-G8

White spirit42

Process parameters LCF 0.5, temperature 40 ° C, duration I h. The completion of the bath is complete. The increase in the thickness of the semi-finished product is 9.6%.

Example 6. Raw cattle are treated as described in example 1. Tanned

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five

the semi-finished product serves polyvinyl chloride dispersion. The composition contains the following components,% by weight of semi-finished kata:

Polyvinyl chloride

PVC-6250-G6

Synthetic fat3

Sulfur N enne

fish oil2

Fish oil1

Process parameters: LCD 0.12, temperature 60 ° C, duration 1 hour. The bath is full. The increase in the thickness of the semi-finished product is 6.7%.

The proposed method allows to obtain high-quality skin. A decrease in the shrinkage of the skin area during drying is observed. So, when processing in polyvinyl chloride in an aqueous medium, the shrinkage of the skin area is 20.6%, and when using industrial oil as a medium, this value reached a value of 5.6%. The best results are obtained when using a water-in-oil emulsion (+ 13.5%) as a hydrophobic liquid. The table shows the qualitative indicators of the semi-finished product processed by the proposed and known methods.

The proposed filling method allows to increase the filling effect by increasing the amount of injected filler, reducing shrinkage of the skin area during drying.

Claims (3)

1. A method of filling a tanned semi-finished product consisting in processing it with a dispersion of polyvinyl chloride with a particle size from 2 to 1, m, characterized in that, in order to improve the quality of the semi-finished product by increasing the amount of injected, fill it and reduce the shrinkage of the skin. when drying, a hydrophobic liquid is used as a dispersion medium, the consumption of polyvinyl chloride is 4-8% of the weight of the semi-finished product, and the treatment is carried out at 40-60 ° C and a liquid coefficient of 0.1-0.5. 2. A method according to claim 1, characterized in that an organic solvent, a fat, or a mixture of fats is used as a hydrophobic fluid. 3. Method 1 and 2, about tl and the fact that water-in-oil emulsion is used as a hydrophobic liquid. Editor M.Nedoluzhenko Compiled by S. Likhachev Tehred L. Serdyukova Order 2121/22 Circulation 355 VNIIPI State Committee for Inventions and Discoveries at the State Committee on Science and Technology of the USSR 113035, Moscow, Zh-35, Raushsk nab. 4/5 Corrector S.Cherni Subscription