SU720019A1 - Method of emulsion oiling and hydrophobization of chrome leathers - Google Patents

Description

The invention relates to the chemical treatment of leathers. zhirovaniya.i emulsion method can be used in the leather industry to impart _ skins increased hydro- ⁵ fobnosti and durability.

One of the most important indicators of the skin characterizing its operational properties is hydrophobicity, which is achieved due to the formation of chromium and aluminum soaps of high molecular fatty acids in its structure.

An increase in the hydrophobicity of the skin has a direct effect on its wear resistance, which is crucial for leather goods such as shoes.

There is a method of emulsion fatliquoring of leathers, which consists in the fact that 20 skin are treated with a composition containing fatliquoring compositions, mainly with the participation of anionic surfactants (soaps, sulfonated, sulfitated and sulfated, products). The common feature in these products is the presence of the groups: —SOjNa, —0SO ₃ Na, —COONa [1]. 'The disadvantage of this method is that the presence of these groups reduces the hydrophobic effect of fatty component compositions, this leads to a decrease in the hydrophobicity of the skin and entails a decrease in their wear resistance.

There is also known a method of emulsion fatliquoring of chrome skins, which consists in the fact that the skins are treated with a hydrophobic composition containing synthetic fatty acids of a fraction, C ₁₀ ~ C ₂₃ , unsaponifiable substances, ammonia and water in the following components,%:.

Synthetic fatty acid lots of fraction C ₁₀ - C ₂₃ Unsaponifiable substances 70 + 5 no more 16 Water is not whiter 25 Ammonia 2.4 + 0.2 (21

The disadvantage of this method is that fatliquoring by this method does not provide the required hydrophobization of the skin.

The aim of the invention is to increase the hydrophobicity of the finished skin.

This is achieved due to the fact that the fatliquoring composition additionally contains ammonium soap and mineral3

next oil correlation - Synthetic fatty acid nii components, wt.%: lots of fraction С С С ₂ 5 69 Synthetic fat Paraffin hydrocarbons acid 50 -7 0 Vogo row CD - C25 ] 0 Unsaponifiable substances 8 -1 2 Ammonium soap 10 Ammonium soap 8-12 Machine oil 9 Mineral oil 6-12 Water eleven Water Rest, Then into the spent solution BEFORE and after processing fatliquoring composition added alum 4.5% from

the skin is additionally exposed to a solution of aluminum alum in an amount of 4-5% by weight of the skin with an FA of 1-1.5.

The introduction of ammonia soap and mineral oil into the fatliquoring composition and the use of the Сd - С ₂₅ fraction as synthetic fatty acids, followed by the processing of the chewed semifinished product with aluminum alum, allows the COOН ₄ group to be split during the drying of the semifinished product with the release of ammonia and its replacement with aluminum to form the group ( COO) j Al. As a result of this, the penetrating ability of the composition is significantly increased, its interaction with derma proteins is enhanced, which leads to an increase in the hydrophobicity of the skin. At the same time, aluminum 'soaps of fatty acids are introduced by the hydrophobic group (С00) ₃ A1 into the chromium complex, and the carbon residue (lipophilic) forms a hydrophobic shell around collagen fibers, making them waterproof, which ultimately increases the operational properties of the finished skin,

Example 1. The skin developed from the skins of cattle according to the standard method [1] were greased with the following composition, in ec. %:

Synthetic fatty acids fraction C _d Paraffin hydrocarbons C ₉ - C ₂₅ Ammonium soap

Spindle oil

Water

Then, aluminum alum 4% of the weight of the skin is added to the spent solution, and the skin is treated for 1 hour. The resulting skin is further processed according to a standard technique.

The results were obtained in skin that had the following characteristics: permeability - 0.258 cm ^ / cm ^ hour (leather fatliquored prototype 30.425 cm ³ / ^g cm per hour); water resistance, min - did not get wet for 120 minutes (skin, greased with the prototype - after 3 minutes).

Example 2. Skin developed from hides of cowhide according to the standard method [1], were fattened with the following composition, weight,%:

skin masses and treated skin for 1 hour. The resulting skin was further processed by a standard technique.

The result was obtained in tev for the skin, which had the following indicators: water permeability (for burns, fat

60.5 cm ^e / cm ² hours); min - do not get wet (ozhi, fat and wet).

PRI me R. 3. from the skins of a goby according to [11 weight

3D

-0.081 cm ³ / cm ² hour prototype water resistance, for 120 minutes the prototype was instantaneous leather, developed by the standard method, lived with the following composition, oh, „

4

Synthetic fatty acids of fraction C ₉ - C _g5 Paraffin hydrocarbons Cg-C 25 Ammonium soap Spindle oil Water

Then, 5% aluminum alum by weight of the skin was added to the spent solution and the skin was treated for 1 hour. The resulting skin was further processed according to a standard technique.

As a result of skin were prepared, which had the following characteristics: permeability - 0.038 cm ³ / ^g cm .chas (leather fatliquored prototype -

9.4 cm ³ / cm-) hour); water resistance, min. did not get wet for 120 min (skin, greased with the prototype - after 4 minutes),

Thus, in all the examples cited, skin was developed that excels in hydrophobicity of the skin, developed by a standard technique. All other indicators in this case met the requirements of GOST,

Using the method allows to increase from ready especially not only to develop leather with neck hydrophobicity, but also the operational properties of leather goods and shoes made from it.

The economic effect will be

144 rub for 1 mpn.dm ² skins, which with the annual release of skins (5 mrd.dm ² ·) will allow. get savings in the amount of 720 thousand rubles.

Claims (1)

This invention relates to the chemical treatment of leather. emulsion fattening method. and can be used in leather industry to make skins more hydrophobic and durable. One of the most important indicators of the skin, which characterizes its operational properties, is hydrophobicity, which is achieved due to the formation of high molecular weight fatty acids in its structure of chromic and aluminum soaps. An increase in the hydrophobicity of the skin has a direct effect on its durability, which is of decisive importance for leather goods such as shoes. The known method of emulsion fat of vanilla leather is that the leather is treated with a composition containing fatty compositions, mainly with the participation of anionic surfactants (soaps, sulphonated, sulphite and sulphated products). Common in these products is the presence of the groups: -SO, Na, -COONa 1.. The disadvantage of this method is that the presence of these groups reduces the hydrophobic effect of the fatty constituents of the compositions, this leads to a decrease in the hydrophobicity of the skin and entails a decrease in their wear resistance. There is also known a method of emulsion fattening of chromic leathers, which consists in treating the skin with a water-repellent composition containing synthetic fatty acids of the fraction, C.Q. non-washable substances, ammonia and water with the following content of components,%: Synthetic fatty acids of the Cjp-C2z fraction 70 + 5 Nominal substances not more than 16 Water not more than 25 Ammonia2, 4 + O, 2 2}. The disadvantage of this method is that fattening by this method does not provide the required hydrophobization of the skin. The aim of the invention is to increase the hydrophobicity of the finished leather. This is achieved due to the fact that the fattening composition additionally contains ammonium soap and mineral oil at the following ratio of components,,%: Synthetic fatty acids 50-70 Oryomas8–12 Lmmoi. 8–8 Mineral oil 6–12 Water Remaining (after treatment The nsiruyuschey composition of the skin is additionally exposed to a solution of aluminum 4-5% by weight of alum in the amount of skins with an LCD of 1-1.5. Introduction to the greasing composition of ammonium soap and mineral oil and using LF as synthetic fatty acids Cd fractions Cji followed by processing of prepared semi-finished product with aluminum alum allows splitting COONH j groups during the drying process of the semi-finished product with the introduction of ammonia and its replacement with aluminum to form the group (COO) j A1. As a result, the permeability of the composition is greatly enhanced; interaction with derma proteins, which leads to an increase in the hydrophobicity of the skin. At the same time, aluminum f-Kina KPip Hfcax acids are incorporated by the hydrophobic group (COO) A1 into the chromium complex, and the carbon residue (lipophilic) forms hydrophobic shell around collagen volokonj their waterproof case - that a final result increases the operational properties of the finished leathers. Example 1e Skins produced from the skins of the bychina according to the standard procedure 1 were prepared with the following composition, in its,%: Synthetic fatty acids of the Cd fraction - Hydrocarbons of the paraffinic series Cd -, 8 Ammonium i-uano & Spun oil6 Water S Then alum alumina is added to the spent solution of 4% by weight of the leather and the skin is treated for 1 hour. The resulting skins are further processed by the t method as well. As a result, skins were obtained which had the following water permeability indices - 0.258 cm- / ci-P. cha (skin, zhirovannye prototype 30, 425); water impermeability, min - not soaked for 120 min (skin, chewed with the prototype - after 3 min). Example 2 The skins produced from the skins according to the standard procedure 1 were fattened as follows, weight,%: C {ntetic fatty acids of the Cd – Cg.-i fraction. 60 Paraffin hydrocarbons Cd-Sad 0 Ammonium I LOW Engine oil 9 Bol 11 Then aluminum alum was added to the spent solution with 4.5% QT of the skin mass and the skin was treated for 1 hour. The resulting skin later processed also by the standard method. As a result, skins that had the following indicators were obtained; water permeability - 0.081 (leather, greased with prototype 60, 5. hour); water impermeability, min - not soaked for 120 min (skin, chewed with a prototype - instantly soaked), EXAMPLE 3. Skins produced from bull skins according to the standard procedure 1, were fattened with the following composition, wt.%: Synthetic fatty acids of the Cd fraction. Paraffin row hydrocarbons CQ-Cjs12 Ammonium soap 12 Spun oil 12 Water14 Then 5% aluminum alum by weight was added to the spent solution leather and treated skin for 1 hour. The resulting skin was further processed by the standard method. As a result, the skin was obtained, which had the following indicators: water permeability - 0.038 cm / cm.hour (skin, greased with prototype 9, 4); water penetration, min. they did not get wet for 120 minutes (the skin was fattened with the prototype after 4 minutes). Thus, in all the examples given, skin was developed that was superior to the hydrophobicity of the skin, and was developed according to the standard procedure. All other indicators at the same time met the requirements of GOST. Using the method allows not only to produce leather with increased hydrophobicity, but also to improve the performance properties of leather goods made from it, especially footwear. The economic effect of 144 rubles. per 1 glln.dm leather, which with the annual release of leather (5 mrd.dm-) will allow you to save in the amount of 720 thousand rubles. Claims The method of emulsion fattening and hydrophobization of chrome skins by treating with an oily compound containing synthetic fatty acids, uncleanable substances and water, characterized in that, in order to increase the hydrophobization of the skins, the fatty composition additionally contains ammonium soap and mineral mine oil in the following ratio components, weight,%; synthetic fatty acids - 50-70, intact substances - 8-12, ammonium soap - 8-12, mineral oil and water are the rest, and after treatment with an oily skin additionally exposed to a solution of aluminum alum in the amount of 4-5% by weight of the skin with QC 1-1,5. Sources of information taken into account in the examination one . Method for the production of chromic leathers of various thicknesses for the upper of shoes made from cattle hides, M., 1975, 2, Technical conditions TU 38 101-597-75, 1975 (prototype).