文献类型：期刊文献

中文题名：漂白紫胶水溶胶的制备

英文题名：Preparation of Aqueous Bleached Shellac Dispersion

作者：李凯[1,2] 周梅村[1] 张弘[2] 郑华[2] 甘瑾[2] 冯颖[2] 张雯雯[2]

第一作者：李凯

机构：[1]昆明理工大学化学工程学院;[2]中国林业科学研究院资源昆虫研究所

年份：2009

期号：18

起止页码：142-147

中文期刊名：食品科学

外文期刊名：Food Science

收录：CSTPCD;;Scopus;北大核心:【北大核心2008】；CSCD:【CSCD2011_2012】；

基金：国家林业局"948"项目(2008-4-78);国家林业局推广项目([2005]72)

语种：中文

中文关键词：过饱和法;漂白紫胶水溶胶;亚微米;成膜性;无皂乳液

外文关键词：supersaturation method; aqueous bleached shellac dispersion; submicron; film-forming capacity; soap-free emulsion;

分类号：TS202.3;S759.7

摘要：为解决紫胶改性中有机或碱性溶剂系统带来的困扰,采用过饱和法制备出弱酸性且具有良好分散性的漂白紫胶水溶胶。通过单因素试验选取因素水平,根据Box-Benhnken中心组合试验设计原理采用三因素三水平响应曲面法,以平均粒径为响应值做响应面和等值曲线。结果表明,最佳工艺条件为转速11054r/min、滴加速度14.25ml/min、漂白紫胶乙醇溶液的浓度6.42%,得出实际最佳平均粒径为20.34μm。通过激光粒度仪对优化条件下制得的漂白紫胶水溶胶进行粒度分析,其99.99%的粒子粒径在小于等于0.6μm以下均匀分布。通过光学显微镜与扫描电镜(SEM)对水溶胶进行表征,漂白紫胶水溶胶中漂白紫胶以球形微粒存在且可以形成光滑的树脂膜。
To solve the problems brought by organic or basic solvents in the modification process of shellac, this study used supersaturation method to prepare a weakly acidic, well-dispersed aqueous dispersion of bleached shellac. A three-variable, three-level Box-Behnken experimental design combining with response surface modeling （RSM） was employed for minimizing average particle size of bleached shellac dispersion. A regression model was proposed for the average particle size as a function of three crucial process parameters. A minimum average particle size of 20.34 μ m was obtained under the optimized conditions：rotational speed of dispersion machine 11054 r/min, dropping speed of shellac, and alcohol concentration 6.42%. Granularity analysis using a laser granularity analyzer indicated that the size of 99.99% particles was distributed uniformly, less than or equal to 0.6 μ m. Optical microscope and scanning electron microscope （SEM） observations revealed that bleached shellac existed in globular particles in the dispersion and could form smooth resin membrane.