Modified larch tannin was prepared by grafting copolymerization and sulfoalkylation, and successfully used as retanning agent, possessing good water solubility and enhanced penetration rate.
利用接枝共聚和磺法
落叶松单宁改性。
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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——
们看中什么,就砍什么向下。