SU565939A1 - Method of filling and pre-tanning leather - Google Patents

Description

one

The invention relates to leather production and can be used for filling and poddublivaniya skin.

An invented method of skins and leather filling, according to which the planed or pressed semi-finished product is treated with modified glyphthalic resin dissolved in an organic solvent, followed by treatment with a solution obtained from mono-. Chevina, urotropina and sulfuric acid (preparation KU) and potassium alum l

However, the implementation of this method is difficult due to the use of organic solvents.

It is also known to use orthophosphoric acid, its glycerol ester or sodium salt as auxiliary agents in single mineral tanning 21.

However, these phosphorus compounds do not possess oak or skin-forming properties as compared with an individual aluminum salt; they do not have the same effect (chinike resistance;

whether aluminum is in solution when alkaline reagents are added.

The purpose of the invention is to improve the quality of the skin.

To do this, the skin is filled and subdivided by treating it with aluminum sulphate and condensed polyphosphate, for example, hexametophosphate, in the presence of an alkaline reagent with a quantitative ratio of hexametophosphate and aluminum salt (0.6-2): 1. intervals of 30 40min

Solutions of aluminum polyphosphoric compounds can be obtained in a separate tank by mixing solutions of aluminum-alumina alum or aluminum sulphate and hexametaphosphate, taken in the indicated ratio, and adjusting the aluminum salt to the required basicity (or pH value of the solution) by adding 5-1.0% with stirring. solutions of medicinal preparations, followed by the use of skin treatment solutions. The same solutions can be obtained directly in the apparatus, where it is processed from a semi-finished product, by simultaneously or sequentially feeding the aluminum salt and sodium hexametaphosphate into the apparatus, followed by the addition of alkaline pea-

gates.

Example 1. Semifinished chrome tanning from the skill of medium or bychin light. {Consumption of materials as a percentage of the weight of planed leather),

After skin planing, the skin is washed with a constant volume of water at a well. k. 2.0-2, temperature 25 - for 15 2 O min. Then it is treated at a well, r. 0.5 - 1, O, temperature 25 - 30 ° C; sodium hexametaphosphate (0.5–3%) B as a 20-25% solution and potassium alum (0.5–2.5%) are introduced into the drum simultaneously or sequentially; After 20–30 minutes, a mixture of sodium bicarbonate and sodium formate or sodium sulfite and sodium formate is injected into the drum at 0.5–1.0% of each reagent in the form of a 10% solution, metered in 3 doses with an interval of 10 minutes. The total processing time is 60-70 minutes. The pH of the solution at the beginning of treatment is 2.83, 2, at the end of treatment - 5.6 - 6.0,

Two washes in a constant volume of water at a well. k. 2.0-2.5, temperature, respectively, 40 and 45 ° C for 10 minutes.

Fatting is carried out according to the method of fattening white skin; after 30-40 minutes of fattening, 0.4-0.6% of titanium dioxide is introduced into the bath and processing continues for 20-30 minutes.

Example 2. Semi-finished chrome tanning from pork skins,

After planing, the semi-finished product is washed with a constant volume of water at a well. to-. 2.0 - 2.5. temperature for 10-15 minutes A subdublanka-filling is carried out at a well, r. 0.5 - 1.0, temperature ZOK; A pre-prepared solution of an aluminum polyphosphate compound, the pH of which is raised to 4.5-5.5, is added to the drum with the addition of a solution of soda ash, sodium bicarbonate or their mixture with sodium formate. Consumption of reagents: aluminum kvass 1.0-2.0%, sodium hexametaphosphate 1.22, 2%. Processing time 456O min. This is followed by rinsing in the usual order, with no other tanning agents.

The solution is prepared as follows. In a reactor equipped with a stirrer, water is heated, heated to the rate of obtaining a 10% solution of aluminum-alumium alum, aluminum alum and sodium hexametaphosphate are poured in a weight ratio of 1: 1.2 and after dissolving them with continuous stirring In the form of a 5-10% solution, one of the reagents is added to increase the basicity of the aluminum sap and the pH of the solution: soda ash, sodium bicarbonate (15-25%) or urotropine (20-30% by weight of aluminum potassium alum) to bring the pH to solution to the level of 4.5 - 5.5. Then, the required amount of the solution is fed into the drum.

Reagents for enhancing the basicity of aluminum salts and pH values can be added to the working bath after 2O — 3

PRI me R 3. Semi-finished chrome tanning from dexterous or bychina, thickness 1.6 - 1.8 mm. After planing, two flushing is performed on a constant volume of water with oil. To 2.0 - 2.5, temperature 30 ° С 8 for 10-15 minutes each. Then treated with well. k. 0.8–1.0, temperature 30 ° C I and the KF disperser (2–5%) potassium alum (1.5–2.0%) and is introduced into the drum sequentially or simultaneously. sodium hexametaphosphate (1.5-2.2%), sodium bicarbonate (1.0-1.5%) or a mixture of bicarbonate in sodium formate at 0 | 6 - ljO% of each reagent or urotropin (0.4-1.0%) in 2-3 doses with an interval of 10 minutes. The total processing time of 60-7 minutes, the pH of the solution at the end of treatment is 5.6 - 6.0 .....

To further process the semi-finished product in the south in three ways.

1 way. Flushing, dyeing and greasing without podbublivan.

N way. A solution of vegetable tanning agent (1-1.5% of tannides) or synthetic tanning agent, for example, Sintan BN, whose consumption is 1.5-3.0% tanning, is introduced into the bath. Treatment is continued for 30 minutes, then dyeing, washing and greasing follow.

Ill way. All processes, up to fattening, can take place in one bath. After the processes have been completed, rinsing is performed at a temperature of 2.5–3.0 to 20–25 ° C for 10 minutes.

The proposed method of filling and podbublivaniya skin improves the quality of skin B connection with the improvement of the forming and filling the effect of the compound of aluminum and polyphosphates.

Claims (2)

Invention Formula 1, a method of filling and podblubliv skin by treating it with aluminum sulphate and phosphoric acid derivatives in the infusion, alkali reagent tBi, characterized in that, in order to improve the quality of the skin, as a phosphoric acid derivative, use condensed popiphosphate, for example By this, the proportion of its aluminum salt is (0.6-2): 1. 2. The method according to p. Ij of a tl and h ay and yc Texis that the condensed polyphosphate and alkaline reagent is added to the bath sequentially with an interval of 30-40 mive. 5 Sources of information taken into account during the examination: 1, Copyright certificate N «183319, cl. C 14 C 9 / OO, 1966. 2. The patent of Switzerland No. 139192, 10 кл. 40, 1930.