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,挺拔的白桦, 穿云的白杨,芬芳的西伯利亚冷杉, 还有黑桦、橡树、山榆、黄栌——他们看中什么,就砍什么向下。