文章摘要
余爵,王显华,余佩敏,邱学青,钱勇,杨东杰.木质素/TiO2复合纳米颗粒的制备及其防晒应用[J].精细化工,2019,36(10):0
木质素/TiO2复合纳米颗粒的制备及其防晒应用
Preparation of Lignin/TiO2 Nano Composites and Their Application in Sun Protection
投稿时间:2019-02-20  修订日期:2019-04-08
DOI:
中文关键词: 天然高分子  木质素  二氧化钛  复合纳米颗粒  天然防晒
英文关键词: natural polymer  lignin  titanium dioxide  nano composites  natural sunscreen
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目)
作者单位E-mail
余爵 华南理工大学 415235264@qq.com 
王显华 华南理工大学  
余佩敏 华南理工大学  
邱学青 华南理工大学  
钱勇 华南理工大学 ceyqian@scut.edu.cn 
杨东杰 华南理工大学  
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中文摘要:
      采用一步水热酯化反应将不同来源的木质素紧密包覆在二氧化钛表面,得到木质素改性二氧化钛复合纳米颗粒。DLS分析显示经木质素包覆改性后,二氧化钛粒径增大8~12 nm;TG分析测得复合纳米颗粒中木质素的质量分数为7.6%~9.0%;TEM及XPS测试结果证实木质素的羧基与二氧化钛表面羟基之间发生了酯化反应,从而使木质素紧密包覆在二氧化钛表面。在此基础上,将木质素改性二氧化钛复合纳米颗粒作为唯一防晒组分制备了防晒霜,测定了防晒指数SPF值并与只含二氧化钛的防晒霜进行性能对比。结果显示:添加质量分数为10%和20%的溶剂型木质素改性二氧化钛的防晒霜的SPF值分别为44和73,明显高于添加二氧化钛的防晒霜,且肤感更优,达到日常防晒的要求。在此基础上探讨了木质素改性强化二氧化钛紫外防护性能的的机理。
英文摘要:
      Lignin from different technical sources were coated on the surface of titanium dioxide (TiO2) via one-step hydrothermal esterification reaction and nanoscale lignin/TiO2 composites were obtained. The results of DLS analysis showed that the particle size of TiO2 increased by 8-12 nm after modification. The mass fraction of lignin in the composites was 7.6%~9.0% by TG analysis. The esterification reaction that happened between the carboxyl groups of lignin and the hydroxyl groups on the surface of TiO2 was confirmed by XPS, and coated lignin could be observed by TEM. The lignin/composite nano composites were then used as the sole sunscreen component to prepare sun creams, and the sun protection factor (SPF) values of the sun cream was measured and compared with that of the sun cream containing same amount of TiO2 only. The results showed that TiO2 modified by organosolv lignin (OL) had the best sunscreen performance and the SPF values of sun creams containing mass fraction of 10% and 20% of OL/TiO2 reached to 44 and 73, respectively, which were much higher than that containing raw TiO2. In addition, the prepared sun creams had better feeling. which met the daily sun protection requirement. Finally, the UV-blocking enhancement mechanism of lignin/TiO2 was proposed.
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