A method of processing leather waste in fire-resistant material

 

(57) Abstract:

The inventive leather waste after chrome tanning gradually in three stages injected into the reaction medium, the first 100 wt.h. waste is introduced into a solution of sulfuric acid containing 10 to 14 wt.h. acid and 86 - 90 wt. including water at a density of sulfuric acid of 1.84 g/cm3the mixture is brought to a boil and when boiling is maintained with stirring for 25 to 30 minutes, gradually for 15 - 20 minutes add the leather waste in the amount of 100 wt. hours, the mixture was incubated for 20 to 30 minutes at boiling, gradually add the leather waste in the amount of 125 - 150 wt.h., maintained at the boil for 3 to 4 hours, add potassium or alimohammadian alum in an amount of 5 - 7% of the reaction mixture, the mixture is stirred for 10 -15 min, then dried to remove water. table 1.

The invention relates to the recycling of tannery wastes for obtaining a flame-retardant thermoplastic material and can be used in the production of, for example, plastics.

Known methods of processing leather waste leather powder for the production of linoleum [1], to obtain a powdery filler faux leather and plastics is La re-use in the leather and fur industries production [3].

However, the known methods do not provide a fire-resistant material in the processing of leather waste.

Also known is a method of processing leather waste, including the treatment of leather tanning waste matter, acid and drying [4]. The method is designed to obtain the "weaving" of the collagen fibers in the form valocordinum membranes or spongy layers.

However, the known method is not used to obtain a fire-resistant material.

The basis of the invention is to create a way of processing leather waste, fire-resistant material by turning tannery waste generated in the process of planing prefabricated skin after plating, viscous homogeneous mass after moisture is removed in the drying process represents a fire-resistant material.

The problem is solved by the fact that in the method of recycling of tannery waste in fire-resistant material, capable of handling their acid, tanning agents, mixing and drying the resulting material to remove water, according to the invention as tannery waste use waste chrome tanning, processing them with acid is carried out in three stages, the density of 1.84 g/cm3and 86-90 wt. including water, the mixture is brought to boiling and maintained at this temperature under stirring for 25-30 min, add in 15-20 min the second portion of tannery waste in the amount of 100 wt.h., the mixture is boiled 20-30 min, add gradually over 20-30 min a third portion of tannery waste in the amount of 125 to 150 wt.h. and maintained at the boil for 3-4 hours, as tanning agents use potassium or alimohammadian alum at the rate of 5-7% of the total reaction mixture, and stirring is carried out for 10-15 minutes

With the proposed method, there is a qualitative change of the properties of the waste should be converted into a viscous sticky mass, after removal of water turns into a solid thermoplastic mass in the form of a plate.

The ranges of process parameters leather processing waste are optimal, since the processing options that are at the lower limits of the indicated ranges, and the reduction in processing temperature and processing time does not provide a process to convert waste into a viscous adhesive homogeneous mass, and the increase in the number of tannery waste, and failure to follow a phased processing leads to the fact that not all wastes are subjected to the and skin after plating in the amount of 100 wt.h. added to the sulfuric acid solution containing 10 wt.h. acid of density 1.84 g/cm3and 90 wt.h. water. The mixture was heated to boiling point and kept at boiling and stirred for 30 minutes Then formed in the mixture gradually for 15 min was added to the second portion in the amount of 100 wt.h. tannery waste, kept the mixture at the boil for 20 min and added to a mixture gradually over a period of 25 min at boiling the third portion of tannery waste in the amount of 125 wt.h. After the reaction mass was kept at boiling for 4 hours Then add 5% by weight of the reaction mixture potassium alum and the whole mass was stirred for 10 minutes Received a sticky mass was dried to remove the water and got a tile thickness of 3 mm

P R I m m e R 2. Tanning chrome tanning waste in the form of chips in the amount of 100 wt. hours are added to a solution of sulfuric acid containing 14 wt. including acid and 86 wt.h. water. The mixture was heated to boiling point and kept at this temperature under stirring for 25 minutes Then formed in the mixture gradually for 15 min was added to the second portion of tannery waste in the amount of 100 wt.h., kept the mixture at the boil for 10 min and was added within 20 min pierreval at boiling for 3 h in the end it was added 7% of the reaction mixture alimohammadian alum and stirred the mixture for 15 minutes The obtained viscous mass was poured on a substrate, obtained by drying a thermoplastic film.

In the table, the characteristic of the material, obtained by the proposed method, depending on the process parameters.

Comparative analysis of the data given in the table shows that viscous homogeneous mass is formed in experiments 1-3, and the obtained film and the tiles are non-combustible. The degree of combustion was determined according to GOST 12.1044-84. In experiment 4 with the reduced consumption of sulphuric acid in the process of transition of solid waste in the viscous mass is slowly finished mass contains a large number of solid particles. In experiments 5 and 6 at the increased consumption of leather waste, the processing at 80-90aboutWith the formed heterogeneous commoratae weight, not suitable for practical use. In experiments 4-6 are obtained camcorderjames film and tiles in some places are easily ignited. In experiment 7, while loading three servings of tannery waste process does not occur.

Thus, only when the proposed options can be obtained with highly concentrated viscous homogeneous mass, removing the water from which is formed nonflammable solid mass, m & g is TBA.

A METHOD of PROCESSING LEATHER WASTE IN FIRE-resistant MATERIAL, including handling acid, tanning agents, mixing and drying the resulting material to remove water, characterized in that the quality of the leather waste use waste chrome tanning, processing them with acid is carried out in three stages, first the leather waste is injected in the amount of 100 wt.h. in a solution of sulfuric acid containing 10 to 14 wt.h. acid of density 1.84 g/cm3and 86-90 wt.h. water, the mixture is brought to boiling and maintained at this temperature under stirring for 25-30 min, add in 15-20 min the second portion of tannery waste in the amount of 100 wt.h., the mixture is boiled 20-30 min, add gradually over 20-30 min a third portion of tannery waste in the amount of 125 to 150 wt.h. and maintained at the boil for 3-4 hours, as tanning agents use potassium or alimohammadian alum at the rate of 5-7% of the total reaction mixture, and stirring is carried out for 10-15 minutes

 

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