Method of pickling-tanned fur, mainly rabbit
Way concerning the technology of manufacture of fur material with soft and long hair and can be used in the fur industry, in particular for dressing skins rabbit. Raw fur is treated with a composition containing oxalic acid, table salt, aluminum alum, nonionic surfactants, Maripol-pellicer and water. Caripol-pellicer enter into the composition for 12-18 hours before the end of the pickling-tanning and processing is carried out at 20-25C. The process is conducted at a liquid rate of 20-22 for 24-26 hours. The technical result is the improvement of the efficiency of the process, reducing its energy costs and improve the quality of the semifinished product. 1 C.p. f-crystals, 1 table.
The invention relates to the technology of manufacture of fur material with soft and long hair and can be used in the fur industry, in particular for dressing skins rabbit.
Well-known industrial technology pickling-tanned fur semi-finished product with soft long hair in barges at 40-50C, liquid ratio (LCD) 9-25, pH 3.5-10 treatment composition on the basis of acids such as mineral and organic is using this technology, meets the requirements of GOST [Author's certificate of the Russian Federation No. 755843, publ. 15.08.1980].
Long hair, prone to solutionyou requires liquid operations at high LCD, and tanning of fur on this technology is accompanied by the formation of large amounts of wastewater containing toxic compounds chromium oxide (VI).
A method of processing fur, allowing to eliminate the use of chromium compounds, water treatment composition based on aluminum alum, fat emulsion, chloride, carbonate, and sodium thiosulfate. Aluminum alum pretreated with sodium carbonate, after which impose additional 40% formalin solution [Patent application No. 93019576/12, the claims publ. 09.10.1995].
The method allows to obtain plastic semi-finished product (complete elongation of 6%), reduce the weight by 13%, but a significant disadvantage of this method is the use of formalin - substances that are toxic and harmful to humans.
The known method of pickling-tanned fur materials processing at 40-50C composition containing sulfuric or acetic acid, table salt, chromic extract, hyposulphite, soda ash and spare the yekha, manufactured using this technology meets the requirements of GOST.
However, this method does not exclude the formation of large quantities of wastewater containing chromium and at elevated temperatures, which leads to higher costs of electricity.
Closest to the claimed technical solution to the technical essence and the achieved effect is a method of pickling-tanned fur materials processing at 30-35C composition containing sulfuric acid, table salt, chromic extract, aluminum alum, other ingredients: Hypo, soda ash, methenamine; processing time fur 10-12 h, LCD 8-10 (Lagina N. And., Martynov, S. F. Handbook of fur and sheepskin industry. M., 1959, pages 156-157).
The disadvantage of this method is the use of toxic substances such as urotropine, and large quantities of wastewater containing chromium. In addition, due to the presence of chromium compounds, this method does not capture enough light, soft fur semi-finished product that would meet the requirements of modern trends of fur fashion. Since the treatment is carried out at elevated temperatures, the necessary additional formaldehyde - substances that are toxic and harmful to humans (EN 93019576/12, from 10.09.1995).
Know the use of oxalic acid in the bleaching process hairline at the stage of recovery to maintain a favorable pH process (Lagina N. And., Martynov, S. F. Handbook of fur and sheepskin industry. M., 1959, page 174).
The technical result of the invention is to improve the processability, getting soft, pliable and easy semi-finished product, while maintaining its strength by eliminating the use of chromium compounds, the reduction of energy consumption.
This technical result is achieved in that in the method of pickling-tanned fur, mainly rabbit, consisting in processing raw material composition containing acid, aluminum alum, excipients, including table salt, according to the invention as the acid used oxalic acid, and as excipients optionally use the nonionic surfactant and greasing material - Caripol-pellicer in the following ratio of components in the processing composition, g/l:
Oxalic acid 16-22
Al the liqueur 1-2
Water the Rest,
and Caripol-pellicer enter for 12-18 hours before the end of the pickling-tanned, when the temperature of the process of pickling-tanned 20-25C.
The process of pickling-tanning is carried out at a liquid rate of 20-22, duration of the process 24-26 hours.
In the proposed method oxalic acid is used as a masking additives, which when interacting with aluminum alum forms an alumina-oxalate complexes that are associated with collagen procrea the structure of the leather fur.
Significant is the use of oxalic acid in combination with alum, salt, nonionic surfactants, anionic fatliquoring agents agent - kombinace surface-active emulsifiers with a hydrocarbon content of active substance 50% - Caripol-pellicer in the claimed ratio of ingredients.
Only the claimed combination of features allows you to achieve the above-mentioned purpose of the invention.
Example 1. In the barge pour water temperature of 25 ° C and dissolved in 30 g/l of sodium chloride, 16 g/l of oxalic acid, 30 g/l aluminum alum, add 1.5 g/l of Picanol. The solution is stirred, Alcala of pickling-tanning is added anionic fatliquoring agents tool - the combination of surface-active emulsifiers with a hydrocarbon content of active substance 50% (Caripol-pellicer) in an amount of 2 g/L. the Total duration of 24 hours, the LCD 20. After unloading skins are aging within 24 hours. The quality of fur in the table.
Example 2. The process of pickling-tanning analogous to example 1, except that oxalic acid is added in the amount of 22 g/L.
Example 3. The process of pickling-tanning analogous to example 1, except that oxalic acid is added in the amount of 20.9 g/l
Example 4. In the barge pour water temperature of 20 ° C and dissolved in her 20 g of sodium chloride and 20.9 g/l of oxalic acid, 25 g/l aluminum alum and 2 g/l of Paramita ML, the solution is stirred, increasing the sample for analysis on the salt and acid, and then load the skin of the rabbit. Oiling is supplied to the tub 12 hours at a rate of 1 g/L. Duration of 26 hours, the LCD 22. After unloading - aging skin within 24 hours.
Example 5. The process of pickling-tanning analogous to example 4, only fatten served after 16 hours after the start of the process.
Example 6. The process of pickling-tanning analogous to example 4, only fatten served through the highest temperature welding, and in the case of example 5 is the highest elongation at break, therefore, the parameters of these processes should be considered optimal. After the process of pickling-tanned skins have not yet passed all stages of processing, and insufficient temperature welding can be increased further doublepane, and the acidity is eliminated, followed by neutralization, resulting in fur skins meet the requirements of GOST 2974-75 skins rabbit skins.
Indicators of abrasion of the scalp and elongation at break GOST not required, but in this case they are needed to represent the strength of hair and supple leather fur, because of the strength of hair and depends on the wear fur, and high elasticity is required later when cutting skins and manufacture of fur.
The proposed method is compared with the known allows us to completely eliminate the use of chromium compounds, which is an important environmental aspect, moreover, the absence of chromium allows for further finishing operations using hydrogen peroxide, in particular bleaching. Also, this method allows to obtain fur semi-finished product with d the ri room temperature, significantly saves energy. Also of note is the low cost of chemicals used.
1. Method of pickling-tanned fur, mainly rabbit, consisting in processing raw material composition containing acid, aluminum alum, excipients, including table salt, characterized in that the oxalic acid is used, and as excipients optionally use the nonionic surfactant and greasing material - Caripol-pellicer in the following ratio in the treated composition, g/l:
Oxalic acid 16-22
Aluminum alum 25-30
Nonionic surfactant 1,5-2
Water the Rest
and Caripol-pellicer enter for 12-18 h before the end of the pickling-tanned, when the temperature of the process of pickling-tanned 20-25C.
2. The method according to p. 1, characterized in that the process of pickling-tanning is carried out at a liquid rate of 20-22, duration of the process 24-26 hours