CS274039B1 - Method of tannery fat-liquoring preparation production - Google Patents

Abstract

The invention describes the production and use of a new of tannery fat-liquoring preparation. It is prepared from animal fat, which, after saponification with sodium hydroxide, is emulsified at 65 to 70 degrees C with 15 to 35 mass parts synthetic raw materials on a base of phthalate (dibutylphthalate, dioctyl phthalate and others). The acquired anionic fat-liquoring preparation has lubrication abilities comparable with other types of tannery lubricants, has viscous to pasty consistency and, in a mixture with anionic and non-ionic tannery lubricants, it is suitable for lubricating grain and lining shoe, haberdashery and glove leather.

Description

The invention relates to a method for producing a tanning liquor preparation from an animal bow. .

The bows are traditionally used for the manufacture of tanneries. Animal and vegetable oils are most commonly used, according to their applicability, cost and the desired effects. As is known, these fats are chemically modified in various ways and are converted into water-emulsifiable tanning lubricants with other excipients such as emulsifiers and unmodified fats.

In some types of leather, animal fat lubricants are often used, e.g. bovine fat, pork ointment and others. These often cause the formation of fat blooms due to the distribution of the solid and liquid fat fractions at different temperatures, especially in cold periods.

The cause of these efflorescences is the movement of solid fat fractions onto the leather surface, where, depending on the free fatty acid content, amorphous to crystalline fat efflorescence is produced. The formation of these rashes is greater, the stronger the leather is lubricated and the higher the content of solid fat, respectively. higher saturated fatty acids.

When the finished leather is stored, it can occur on the basis of bacterial resp. enzymatic reactions to strongly break down natural fats and release higher saturated fatty acids, which also leads to the formation of fat rashes.

In some cases, animal fats are chemically treated prior to being processed into tanner lubricants), e.g. by chrilling, oxidation, saponification n, etc., thereby suppressing the possibility of fat rashes.

Ouleraz known methods of producing a lubricant from animal fat consisted e.g. in oxidation, it is altered and oxidized with paraffin and stinging with a tallow and their subsequent sulfotation. It is also known to produce a lubricant by sulphating gluten fat and subsequently mixing it with oxidized paraffin and tall oil. Furthermore, a lubricant produced by direct chlorination of tanning wastes containing fat is known. A method is also known which is based on the sulphitation of animal fat and subsequent emulsification with polyglycol ether emulsifiers.

More recently, the method of modification of animal fat alcoholysis under the action of lower alcohols is described, followed by sulphation and / or sulphation. sulfitation to form an anionic lubricant consisting of higher fatty acid monoesters.

The disadvantage of all the above described animal fat lubricant preparations is the high technical and energy demands of the device, high production costs and thus the impossibility of preparing the lubricant in the tanneries operation.

However, the separate use of animal fats in the form of alkaline soaps is characterized by reduced lubricity. This is due to the fact that alkaline soap based on animal fat contains a maximum of 30% lubricants.

Alia has retained the softness of the leather, practically triple the amount of zinc-coated fats compared to other commonly used tanner lubricants containing approximately 70 to 00% lubricants.

The above-mentioned problems of rational use of animal fats for the preparation of lubricants are solved by the invention, whose principle is that for the preparation of lubricants based on animal fat

CS 274 039 B1 synthetic materials are used which are characterized by o and oaktoin. Phthalate-based synthetic raw materials, e.g. digutyl phthalate, dioctyl phthalate, or linevolphthalate, are emulsified in a concentrated alkaline soap solution, while stirring at 65-70 ° C for 70-90 minutes during the preparation of the lubricant. The use of synthetic wetting agents is in an amount of 15 to 35 parts by weight per 100% by weight. parts of alkaline soap.

Due to the pasty consistency of the lubricants, there is no agglomeration of the separated fat particles even during several months of storage.

The use of phthalate-based synthetic raw materials to emulsify alkaline soaps derived from animal fats is qualitatively new and allows to significantly enhance the lubricating ability of alkaline soap to a comparable level with other types of tanner lubricants. The proposed method of manufacturing a tanning liquor preparation is also materially, energy and technically undemanding, which can be advantageously used in many tanneries production plants, and thus offactively rushes animal fat as an available waste material.

The production method of animal fat-based tanning liquor and synthetic plasticizers (phthalate series) is given in the following examples:

Example 1 a) Alkaline soap preparation process (first stage of preparation of the proposed liquor)

450 masses are pre-metered into the duplicator boiler. parts of water at a temperature of 65 to 70 ° C. With constant stirring, 150 wt. parts of heated glacial fat. The saponification is then carried out with a sodium hydroxide solution prepared from 105 wt. parts of flake sodium hydroxide and 345 wt. parts of water.

It is saponified at 70 ° C by the slow addition of sodium hydroxide solution over a period of 90 minutes.

After the reaction has taken place, the saponified fat is allowed to stand at 60 ° C for 90 minutes at which time the layers separate. The mother liquor is drained without stirring.

Removal of excess sodium hydroxide is accomplished by flashing with the addition of 900 wt. parts of 15% NaCl. Seeding is carried out at 60 ° C for 30 minutes. The contents of the boiler are then allowed to stand for 120 minutes. The bottom layer of brine is drained. A second wash, this time with 900 wt. parts of 5% NaCl at 60 ° C for 30 minutes. The contents of the reaction cauldron are allowed to stand for 120 minutes, followed by draining the ground water of the brine. Finally, the soap thus prepared is diluted with 600 wt. parts of water at 60 ° C. After mixing, the contents of the boiler are drained.

The preparation of the liquor preparation itself is carried out according to the following examples.

b / Preparation of the liqueur preparation

100 wt. parts of the concentrated alkaline soap solution prepared according to Example 1a is pumped into a duplicator and heated to 70 ° C. Then, with stirring 1, 20 wt. parts of dibutyl phthalate for 70 minutes, i

Dibutyl phthalate is emulsified in an alkaline soap solution over the next 30 minutes with stirring. The entire contents of the reaction tank are then discharged into metal drums with a lid.

The lubricant thus prepared contains 30-33% of lubricants, 6-7% of emulsifying agents and 25 and 27% of emulsifying agents. It is a liquid viscous preparation of white to cream color, well emulsifying in warm and cold water. In tannery grain mixtures with anionic types of lubricants it is used for grain dressing, lining of footwear, haberdashery or glove leather.

Example 2

Preparation of liqueur preparation

100 wt. parts of a concentrated alkaline soap solution prepared according to Example 1a is pumped into a duplicator and heated to 65 ° C. Then, with stirring, 25 wt. parts in dioctyl phthalate for 90 minutes. The contents of the reaction tank were further stirred for 30 minutes. The entire volume is then discharged into metal drums.

The lubricant thus prepared contains 32 to 37% lubricants, 5 to 7% emulsifiers and 27 to 32% emulsifiers. It is a liquid viscous preparation of white to milky-yellow color, which emulsifies well in warm and cold water. It is used to freeze leather mixed with anionic and non-ionic lubricants.

Example 3

Preparation of liqueur preparation

100 wt. A portion of the concentrated alkaline soap solution prepared according to Example 1a is pumped into a duplicator and heated to 65 ° C. Then, with stirring, 30 wt. parts of linevolphthalate. The entire contents of the reaction vessel were further stirred for 30 minutes and then discharged into metal drums.

The lubricant thus prepared contains 35-42% lubricants, 4-7% emulsifying agents and 30-37% emulsifying agents. It is a preparation of viscous to pasty consistency, white or slightly yellowish color.

The liquid formulations prepared according to the invention can be used in combination with sulphated and / or sulphated formulations. sulphated types of tanning lubricants for the manufacture of leather of shoemaking, glove or haberdashery leather of any tanning raw material.

Claims (1)

A process for the manufacture of a tanning liquor composition from animal fat, characterized in that 100 parts by weight of alkaline soap at a temperature of 65 to 70 ° C for a period of 70-90 minutes of emulsification with synthetic phthalate-based plasticizers, such as dibutyl phthalate, dioctyl phthalate or linevolphthalate, amounting to 15 to 35 percent by weight of the alkaline soap.