Composition for dyeing leather
(57) Abstract:The composition relates to the dyeing of leather and can be used in tanneries. The composition contains-naphthol - or reportingperiod of guanidine. The use of this structure simplifies the process, improves the manufacturability of production of hides and saves water and materials. The invention relates to light industry, namely to leather manufacture, and can be used to obtain a dyed intermediate product.Known staining of the skin with amino (Patent 2060335, Russia. A method of obtaining structural-painted amino. Chursin Century. And., Ilyukhin O. A., IPC 14 3/08). The closest to the technical essence of the present invention is a composition for dyeing on the basis of guanidine (metacid) (Patent 2131443, Russia. The method of obtaining polymer products for skin treatment. Popova E. N., Kosheleva, O. E., IPC 14 3/22)- prototype where to get dye required test result.The aim of the invention is to simplify the process, improve the manufacturability of skins, saving water and materials.This goal is achieved by the fact that in sicherheitsbedingungen, with intense color.The proposed composition is as follows.Polyhexamethylene guanidine (phmg) is treated with a solution of formaldehyde (molar ratio 1:4) 0.01 N. the solution of borax at 45-100oC for 6-8 hours After reduction/heating (if necessary) temperature up to 60oC reaktsionnuyu mixture entering oceanoptics connection ( -naphthol, resorcinol) in an amount equimolar pgmg. The resulting product is washed from unreacted compounds to negative reactions to phenols.The synthesized products have intense color, due to the structure of the oligomer, in which between oxypropane and aminopropane pgmg form numerous hydrogen bonds.Example 1. In the reaction flask contribute to 70.5 wt.h. Pgmg, 146 ml of formalin and 125 ml of 0.01 n solution of borax. Synthesis of lead 6-8 h with constant stirring until no odor of formaldehyde. If necessary, the temperature decrease/increase to 60oWith, fall asleep 72 wt.h. -naphthol, the reaction continued for another 2 hours, the resulting resin is washed from the unreacted-naphthol with ethyl acetate. The resin has a dark brown color.Example 2. In the reaction flask make specified which. of resorcinol and continue the reaction for another 2 hours and Then the resin is washed with ethyl acetate, it is red.Semi-finished leather, processed received modificate pgmg, acquires color after filling-retanning resin without carrying out the dyeing process other dyes for leather. In example 1, the skin turns brown, for example 2 - in red. The color is stable to dry and wet friction, exposure to organic solvents. Composition for dyeing leather, including aromatic derivatives of guanidine, characterized in that the aromatic derivative used-naphthol - or reportingperiod of guanidine.
FIELD: leather industry.
SUBSTANCE: semifinished product is degreased, neutralized, dyed, and lubricated. Dyeing is performed in two washing-interrupted steps with anionic black dye consumed in amount 0.5-0.6% of the weight of semifinished product in each dyeing step. Lubrication is followed by retannage with chrome tanner in amount 0.6-1.0% of the weight of semifinished product (calculated for chromium oxide) and treatment with 0.8-1.0% of spindle oil.
EFFECT: achieved deep black color and high performance characteristics.
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