Modified larch tannin was prepared by grafting copolymerization and sulfoalkylation, and successfully used as retanning agent, possessing good water solubility and enhanced penetration rate.
利用接枝共聚
基化
方法
松单宁改性。
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I The tall Dahurian larch, the evergreen Scots pine, the slim and straight white birch, the cloud-piercing Korean aspen, the aromatic Siberian fir, along with black birch, oak, mountain elm, Chosenia arbutifolia—whatever they laid eyes on, they cut down.
高大
落叶松， 常青樟子松，挺拔白桦， 穿云白杨，芬芳西伯利亚冷杉， 还有黑桦、橡树、山榆、黄栌——他们看
什么，就砍什么向下。
嬉戏、旋转和起舞；沐浴，为沿途
