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
共聚和磺烷基化
方法对落叶松单
。
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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.
高大的落叶松， 常青的樟子松，挺拔的白
， 穿云的白杨，芬芳的西伯利亚冷杉， 还有
、
树、山榆、黄栌——他们看
什么，就砍什么向下。
过山间
