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1. 发明申请

WO2015044766A8 CHROME TANNING PROCESS 审中-公开
标题翻译：铬染色工艺
公开(公告)号：WO2015044766A8
公开(公告)日：2016-04-07
申请号：PCT/IB2014001960
申请日：2014-09-30
申请人： RHODIA POLIAMIDA E ESPECIALIDA
发明人： LOURENÇO WAGNER CÉLIO FERRAZ
IPC分类号： C14C1/08 , C14C3/06
CPC分类号： C14C3/06 , C14C1/08
摘要： The invention concerns a process for tanning hide to obtain leather. The general process for obtaining the intermediary wet blue stage comprises the following steps : a) a picking step with acid and salt, followed by b) a tanning step with chromium salt, followed by c) a basification step. The invention is characterized in that between step b) and c), a re-acidification step with organic acids is added. In particular the organic acids are selected from glutaric acid (GA), 2-methyl glutaric acid (MGA), succinic acid, ethyl succinic acid (ESA), adipic acid (AA), maleic anhydride, fumaric anhydride, tricarboxylic acids, hydroxycarboxylic acids, and mixture thereof. This invention enables an increase of the up-taking of the re-tanning products and provides leather with improved mechanical properties.
摘要翻译：本发明涉及一种鞣制皮革以获得皮革的方法。获得中间湿蓝色阶段的一般方法包括以下步骤：a）用酸和盐进行采摘步骤，然后b）用铬盐进行鞣制步骤，然后c）碱化步骤。本发明的特征在于在步骤b）和c）之间，加入有机酸的再酸化步骤。特别地，有机酸选自戊二酸（GA），2-甲基戊二酸（MGA），琥珀酸，乙基琥珀酸（ESA），己二酸（AA），马来酸酐，富马酸酐，三羧酸，羟基羧酸，及其混合物。本发明能够增加鞣制产品的上升，并为皮革提供改善的机械性能。

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