Status quo on the preparation and application of shellac resin emulsion

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Advance in Forestry Research May 2013, Volume 1, Issue 2, PP.22-27

Status Quo on the Preparation and Application of Shellac Resin Emulsion Qi Chen1, 2, Hua Zheng2#, Yanlin Sun1, Meicun Zhou1, Hong Zhang2, Kun Li2, Haobo Ji1, 2 1. Faculty of Chemical Engineering, Kunming University of Science and Technology, Kunming 650224, China 2. Research Institute of Resources Insects, Chinese Academy of Forestry, Kunming 650224, China #Email:

kmzhhong@163.com

Abstract Applications of shellac and shellac resin are introduced, they are used widely. But the application range of them also remains limited, the solvent system monotonous is an important reason. Methods for the preparation of shellac resin emulsion are presented, and the emulsification mechanism is discussed. The feasibility of commonly used emulsion preparation methods is summarized. The new methods like SPG membranes, ceramic membranes in the shellac resin emulsion preparation are discussed. The researches on shellac resin hydrophilic modifications are presented. The effect of shellac resin hydrophilicity on emulsion preparation and emulsion stability is discussed. The applications of shellac resin emulsion are proposed. Keywords: Emulsion; Shellac; Shellac Resin; Hydrosol

紫胶树脂乳液的制备及应用研究概况* 陈奇 1, 2,郑华 2#,孙彦琳 1,周梅村 1,张弘 2,李坤 2,冀浩博 1, 2 1. 昆明理工大学 化学工程学院,云南 昆明 650224 2. 中国林业科学研究院 资源昆虫研究所,云南 昆明 650224 摘 要:紫胶树脂应用广泛,但由于其本身的一些缺陷限制了其应用,其中之一就是紫胶树脂溶剂系统单一。现有紫胶树 脂—水分散体系的制备方法不能满足其应用的要求。分析得出紫胶树脂乳液制备工艺的重点在于乳液制备方法的选择和紫 胶树脂亲水性改性两个方面。概述了传统乳液制备方法,以及 SPG 膜、陶瓷膜等乳液制备新方法的成乳机理,并对现有 乳液制备方法应用于紫胶树脂乳液制备的适用性进行了探讨。近年来,国内外学者对紫胶树脂亲水性改性的研究进展成果 颇丰,在此基础上分析了紫胶树脂亲水性的改善对其乳液制备和乳液稳定性的影响。并对紫胶树脂乳液的制备和应用进行 了展望。 关键词:乳液;紫胶;紫胶树脂;水溶胶

引言 紫胶又称虫胶,是寄生在植物上的紫胶虫分泌的天然树脂混合物,主要成分为紫胶树脂,其余成分包 括蜡质、色素、蛋白质、盐类以及糖类等紫胶虫新陈代谢产物和外来掺杂物。紫胶中含量最多的物质即是 紫胶树脂,约占总重的 65%-80%,其平均分子量在 1000 左右。每个紫胶树脂分子单体中含有 4~5 个羟 基,2~3 个酯基,1 个游离羧基及 1 个醛基

。紫胶树脂具有良好的耐磨、耐油、抗盐渍、抗盐雾能力和

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较好的黏结、成膜性能等优良特性,但由于紫胶树脂耐热性差、水溶性差等缺点,限制了其应用。合成树 脂出现后,在很多应用领域取代了紫胶树脂;近年来,由于化石能源的日趋枯竭和使用绿色、环保材料的 理念迅速普及,紫胶树脂又重新得到了科学界关注,人们对其分子结构和物化性质进行了更加深入的研 *基金资助:受国家林业公益性行业科研专项(201204602)资助。

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