排序方式： 共有37条查询结果，搜索用时 10 毫秒
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基于气液两相剪切流,提出了一种结构简单、成本低、控制方便的微胶囊制备方法,设计了基于冷热加工工艺的玻璃微喷嘴为核心器件的微胶囊制备系统。研究了微胶囊制备工艺参数和芯、壁材配方对微胶囊有效直径Deff的影响规律,利用混合正交实验确定了最优的系统微胶囊制备工艺参数,并在最优的微胶囊制备工艺参数条件下确定了微胶囊芯、壁材的最佳配方。试验结果表明:表征微胶囊制备系统稳定性的液体含量l变化平缓,变异系数Cv<6.38%,系统具有较好的稳定性;在最优的微胶囊制备工艺参数和芯、壁材配方条件下即微喷嘴直径1000μm、微喷嘴不含平行端部、喷射压力0.04 MPa、海藻酸钠浓度1%、氯化钙浓度1%、壁材与芯材的比值为2:1时微胶囊的包埋率可达56.44%;干燥后玉米胚芽油微胶囊微观结构较规则,表面致密,可以有效完成对玉米胚芽油的包埋。 相似文献
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1993年．在东北大学学习的刘载望,受1992年年底小平同志南巡讲话的影响．强烈意识到以经济建设为中心的新一轮改革开放将在神州大地掀起发展的浪潮,没等大学毕业,他就毅然放弃学业投身于社会,开始闯入商海开启自己的创业梦想。 相似文献
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In order to improve the machinability but not to impair other properties of the prehardened mold steel for plastic, the composition was designed by application of Thermo-Calc software package to regulate the type of nonmetallic inclusion formed in the steel. The regulated non-metallic inclusion type was also observed by SEM and EDX. Then the machinability assessment of the steel with designed composition under different conditions was studied by the measurement of tool wear amount and cutting force. The results show that the composition of free cutting elements adding to mold steel for plastic can be optimized to obtain proper type of non-metallic inclusion in the aid of Thermo-Calc, compared with the large volume fraction of soft inclusion which is needed for promoting ductile fracture at low cutting speeds, the proper type of inclusion at high cutting speeds is glassy oxide inclusion. All those can be obtained in the present work. 相似文献
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