The acid value and over-oxidation will keep increasing .
油脂的酸价和过氧化值不断升高。
The unsuitable carbonitriding process, internal oxidation, over deep depth of carbonitrided layer and crust like C N compound on the surface are the main reasons to cause fracture.
碳氮共渗工艺选择不当，共渗层过深，表面出现壳状碳氮化合物、内氧化等缺陷组织是造成其断裂的主要原因。
Hydroxypropyl starch and oxidized starch was prepared by etherification or oxidation with green soybean starch, and the optimum production conditions was found. The yield was over 90%.
用绿豆淀粉通过醚化或氧化制成羟丙基淀粉和氧化淀粉，找出最佳工艺条件，收率可达90 %以上。
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