Leather composition testing and leather formula reduction. A certain analysis technology is a mature leather composition testing and leather formula reduction technology in China. By understanding the ingredients, the entire formula can be optimized, product performance improved, and the success rate of research and development increased. The following is 1 reference leather formula provided by this technology (public formula data is for reference only).
Leather ingredient raw materials————–Leather formula proportion (mass parts):
Sodium dichromate————————15~25 parts;
Hydrochloric acid——————————10~20 parts;
Stearic acid————————–70~85 parts;
Aluminum trichloride (anhydrous crystal)————50~60 parts;
Sodium carbonate————————–40~50 parts;
Water———————————3~10 parts.
Leather formula preparation method: Place the leather component materials sodium dichromate and ethanol in an enamel reactor, add hydrochloric acid dropwise while stirring, and perform a redox reaction for 30 to 50 minutes after the addition, until the reactant changes from red-brown to green. Leave it for another 30 minutes, pour it into a crystallization tank and let it stand for 24 hours to precipitate sodium chloride. Take the upper green liquid and dehydrate and concentrate it under vacuum at 13.3kPa and above 95℃. After the concentration is completed, cool the temperature to 80~90℃, then add ethanol and stir for 20 minutes to obtain monohydroxychromium chloride. Add the main leather components, that is, dissolved stearic acid, ethanol-dissolved aluminum trichloride and chromium hydroxychloride into the reaction kettle, stir and raise the temperature to 60°C ± 5°C for reaction. After 30 minutes, Add sodium carbonate, maintain this temperature and continue the reaction for 2 hours. After the heat preservation is completed, leave it for 30 minutes until the material is transparent, and dissolve it in 40°C water to obtain the leather formula. Product characteristics: This product is green or blue-green, with a pH of 2.2~5.8. It is mainly used for leather waterproofing. This technology has been dedicated to testing leather components and restoring leather formulas for 5 years, helping many customers develop new products and improve product performance.
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