NaOH与NaClO改性淀粉胶粘剂的流变性能研究  

Study on rheological properties of starch adhesive modified by NaOH and NaClO

作　　者：阳志强 李辉 李祥刚 Yang Zhiqiang;Li Hui;Li Xianggang(College of Packaging and Materials Engineering,Hunan University of Technology,Zhuzhou 412007,Hunan,China)

机构地区：[1]湖南工业大学包装与材料工程学院,湖南株洲412007

出　　处：《中国胶粘剂》2022年第5期24-31,37,共9页China Adhesives

基　　金：国家重大科研仪器研制项目(51927810);湖南省教育厅优秀青年项目(18B288)。

摘　　要：以NaOH为糊化剂、NaClO为氧化剂,对淀粉进行了糊化氧化改性,并以此为基础制备了淀粉胶粘剂。采用流变学的表征方法系统地研究了温度、NaOH与NaClO用量对于淀粉糊化过程的影响,并探究了NaOH与NaClO用量对淀粉胶粘剂性能的影响。研究结果表明:玉米淀粉的糊化温度为60~70℃,当加入NaOH为糊化剂时,室温之下淀粉已经开始部分糊化。以NaClO为氧化剂对淀粉进行改性时,随着NaClO用量的增加,改性淀粉的黏度降低,流动性明显变好,从半凝胶变为可流动的液体。由淀粉胶粘剂的流变测试可得,淀粉胶粘剂随角频率的增加,复数黏度呈幂律降低,表现出剪切变稀的现象。一定量NaOH和NaClO加入降低了淀粉胶粘剂的储能模量、损耗模量和复数黏度。添加质量分数为10%(相对于干淀粉质量而言)NaOH溶液和20%(相对于干淀粉质量而言)NaClO溶液制备的淀粉胶粘剂的效果更佳。Starch was modified by gelatinization and oxidation with NaOH as gelatinization agent and NaClO as oxidant,and starch adhesive was prepared on this basis. The effects of temperature,the amount of NaOH and NaClO on the gelatinization process of starch were systematically studied by rheological characterization method,and the effects of the amount of NaOH and NaClO on the properties of starch adhesive were also explored. The research results showed that the gelatinization temperature of corn starch was 60-70 ℃. When NaOH was added as gelatinization agent,the starch had begun to partially gelatinize at room temperature. When starch was modified with NaClO as oxidant,with the increase of NaClO amount,the viscosity of modified starch decreased,the fluidity improved obviously,and the semi-gel changed into the flowing liquid. From the rheological test of starch adhesive,it could be seen that with the increase of angular frequency,the complex viscosity of starch adhesive decreased in a power-law manner,which showed the phenomenon of shear thinning. The addition of a certain amount of NaOH and NaClO reduced the storage modulus,loss modulus and complex viscosity of starch adhesive. The effects of starch adhesive prepared by adding 10%(relative to the mass of dry starch)NaOH solution and 20%(relative to the mass of dry starch)NaClO solution were relatively better.

关 键 词：淀粉胶粘剂 NaOH糊化 NaClO氧化 流变性能 

分 类 号：TQ432.2[化学工程]