The composition for the fatliquoring of leather

 

The composition is intended for the fatliquoring of leather, cattle, goat and sheepskin. The composition contains chlorinated paraffin chlorinated 44-47 wt. % of fatty acids of vegetable origin, mineral oil, tall oil and emulsifier. The technical result is getting soft, supple, not olenych skin with good physical and mechanical properties. table 2.

The invention relates to the leather industry and can be used for the fatliquoring of leather, of bovine (cattle), goats and sheepskin.

Known composition [1] for the fatliquoring of leather, including additional soap stock, i.e., the sodium Soaps of fatty acids. The disadvantage of this method is the long time (up to 90 min).

Known composition [2] for the fatliquoring of Russian leather, saddlery leather with a solution of fat-containing tall oil 15:70 wt.%. However, such a high content of tall oil in the fat gives osal on Giovanni skins that require additional process steps: degreasing, grinding, and storage of hides is migrating up fat.

Known composition for the fatliquoring of leather "Hanat" (3), including chloro-paraffins with chlorine content of 28 to 36 wt.%, liquid paraffin, a mixture of mono, what application it consists of mono - and dialkylphenols gives fat, and therefore the finished leathers specific unpleasant smell, and the high content of fat in the skin makes it "hard" to the touch, and when storing the possible migration of fats from the skin, which leads to the shedding of paint.

A prototype of the proposed structure is [4] the method of fatliquoring of leather using greasing emulsion of the following composition, wt.%: synthetic fatty acids 20-40, paraffin 20-60, mineral oil, 20-40.

This method of fatliquoring can partially improve water properties of the skin, but it does not improve the physico-mechanical properties of the skin.

Also the disadvantage of this method of fatliquoring is that synthetic fatty acids are currently very expensive raw materials, and their saponification difficult process with a large amount of wastewater. Therefore, development of leather used in this method requires a large economic costs.

In the claimed invention, the aim was to create economic advantageous composition for fatliquoring, which will allow you to get soft, supple, not ocalenie skin with good physical and mechanical properties.

This is achieved by the fact that the composition for the fatliquoring of leather which you plant origin with the number of carbon atoms of the C8-C24normal structure (with an even number of carbon atoms) in an amount 31-32 wt.% the next time the content of other components in the oiling composition, wt.%: Mineral oil - 31 - 32 Tall oil - 9 - 10 Emulsifier - 7 - 8 In the introduction part for the fatliquoring of chlorinated paraffin with a high content of chlorine, CL2(grade CP-470) increases the interaction of chlorinated paraffins with collagen due to the large number of groups With C1 by attaching polar groups With C1 to place functional groups of collagen, which significantly improves the physical and mechanical properties of finished leather.

The use of fatty acids of vegetable origin in the composition for fatliquoring gives the skin softness and elasticity.

Used fatty acids are waste vegetable oils and margarine production, which makes the composition for fatliquoring economically profitable.

The combination and proportion of the proposed components in the composition for fatliquoring allows you to get after fatliquoring of leather without Ocala, soft, supple with improved physical and mechanical properties.

Example 1 a Composition for the fatliquoring of leather is a ready to use product, which gatavoshanai, wt.%: Chlorinated paraffin chlorinated 44-47 wt.% - 20,0 Fatty acids of vegetable origin - 31,5 Mineral oil - 31,5 Tall oil - 9,5
Emulsifier - 7,5
The mixture is homogenized at a temperature of 50-60oC for 0.5-1.0 hours

The quality and suitability of the sample for testing of technology is determined by its homogeneity and stability of the aqueous emulsion wt. the share of 5%. Ready stock for fatliquoring is a homogeneous, viscous brown liquid, a density of 0.9-1.0 g/cm3at 20oWith, an acid number of fatliquoring composition for 60 to 90 mgKOH/g, mass fraction of water less than 2%, the mass fraction of fattening substances more than 95%.

The leather obtained according to standard methodology, it is greased proposed by the composition of the spent dye bath for color skins and clean water for bright colors.

The prepared composition for fatliquoring pour at once into greasing equipment. Liquid ratio of 0.7-1.0, the temperature of the fatliquoring 55-60oWith time fatliquoring 30-50 min. Flow rate of from 2.5 to 10% by weight of shaved leather depending on the raw material.

Next, the skin is treated according to the methods approved by the company.

By analogy with example 1 was prepared compositions transcendent values p of leather technology, example 1.

The result is a finished leather, which have physical and mechanical properties, are presented in table. 2.

As can be seen from the table. 2, the greatest effect allows to achieve a set of concentrations of the components described in examples 1, 4, 5.

The proposed composition for fatliquoring allows you to get the skin that can withstand elongation at a load of 1 kg/mm2- 35%, which is 4% more than in the prototype, while the ultimate tensile strength equal to 3.3 kg/mm2that is also better than in the prototype, the rigidity of the skin only 18 g/force and deflection is 4 points. Skin after treatment are soft, elastic, without Ocala.

In addition, the use of waste vegetable oils and margarine production reduces the cost of the obtained composition for fatliquoring and simultaneously dispose of waste and to expand the raw material base.

Sources of information
1. Copyright certificate 1174476, MKI With 14 9/02, publ. 1985

2. Copyright certificate 829672, MKI With 14 9/02, publ. 1981

3. Patent 1596775, MKI With 14 9/00, publ. 1996

4. Copyright certificate 715625, MKI With 14 9/02, publ.1980


Claims

The composition for fatliquoring to the integration of paraffin chlorinated 44-47 wt.% and fatty acids of vegetable origin in the following ratio of components, wt.%:
Chlorinated paraffin - 18-22
Fatty acids of vegetable origin - 31-32
Mineral oil - 31-32
Tall oil - 9-1
Emulsifier - 7-o

 

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