Modified larch tannin was prepared by grafting copolymerization and sulfoalkylation, and successfully used as retanning agent, possessing good water solubility and enhanced penetration rate.
利
枝共聚和磺烷基化的方法对落叶松单宁改性。
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房间(上) Have greatly enjoyed all this huge day, sauntering and seeing, steeping in the mountain influences, sketching, noting, pressing flowers, drinking ozone and Tamarack water. Found the white fragrant Washington lily, the finest of all the Sierra lilies.
非常享受这一重要
一天,漫步和观赏,沉浸在山间
影响中,素描,注意,压花,喝臭氧和落叶松水。找到了白色芬芳
华盛顿百合,这是所有塞拉利昂百合中最好
。
