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Method for providing a condensed tanning agents and a plant extract containing modified plant extract is obtained by polymerization with astringent properties
Method for providing a condensed tanning agents and a plant extract containing modified plant extract is obtained by polymerization with astringent properties
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机译:提供缩合鞣剂的方法和包含收敛性的聚合反应获得含有改性植物提取物的植物提取物
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摘要
"The process of obtaining a plant extract containing condensed tannins, with caracteru00ecsticas astringent, modified by copolimerizau00e7u00e3o, for use in tanning and retanning of leather.Plant extract with astringent properties, modified by copolimerizau00e7u00e3o, and use of a modified plant extract containing tannins.The present invention relates to a process for obtaining a plant extract containing condensed tannins, with astringent characteristics modified by copolimerizau00e7u00e3o,For use in tanning and retanning of leather; the plant extract thus obtained; and also to their use in the treatment of skin.The process of this invention comprises the following steps: (a) adding a reactor water in a ratio of 2.0 to 5.8% by weight relative to the weight of the load desired; (b) add to the reactor 1.2 to 2.5% by weight of a copolimerizau00e7u00e3o agent, selected from among acrylic acid, methacrylic acid,Mixtures of acrylic acid and methacrylic acid or their esters; stirring; (c) adding acid to glycollic uncle at a proportion of 0.1 to 1.7% by weight, with refrigeration,Leaving react to occur the exothermic reaction and the temperature reaches 95 198 C, after said reaction product leaving the reactional obtained cooling; (d) to adjust the pH to values in the range of 3.5 to 7.0 with the addition of alkali; (E) mixing an extract in powder extracted from a vegetable with water in a ratio of about 0.5 to 2.0 kg / 1 water; or alternatively.Mix a solution of tannin in liquid form at a concentration of 25% to 60%; (f) to elevate the temperature of the mixture to a range between 67 and 98 198C, to occur in the reaction.For a period of 2 hours to 7 hours, preferably 5 hours; (g) adding sodium bisulfite in a proportion of from 0.5 to 4.0% by weight,On the amount of tannin; (H) to elevate the temperature of the mixture while being heated the reactional system at a temperature between 45 and 127 198 C, the pressure is between 0.2 and 7 kgf / cm ^ 2 ^; and (I) maintain a reaction time of about 4 hours.
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