汉麻粉的防晒性能研究

分别采用球磨、酸和碱对汉麻粉进行处理。通过红外光谱、扫描电镜、紫外可见分光光度计和SPF测试仪对汉麻粉的结构、表观形态及其防晒性能进行表征。实验结果表明:在全波段范围内,单一依赖汉麻粉质量分数的增加,对提高样品紫外吸收性能是非常有限的;球磨破碎法处理时间对吸光度影响不大;对比不同种类酸处理以及未做任何处理的结果,醋酸对吸光度的提高最大;对比不同种类碱处理以及未做任何处理的结果,三乙醇胺对吸光度的提高最大,并且其对吸光度的提高大于醋酸;经酸、碱处理后,汉麻粉红外吸收峰的强度有所下降,汉麻粉本身的不规则片状结构并未发生改变;对比不同处理方法的汉麻粉的SPF值,碱处理的SPF值最高。

Study on sun-screening performance of hemp powder

Hemp powder was treated by separate technological operations, such as ball mill grinding, acid treatment and alkali treatment. Then the structure, apparent morphology and sun screening performance of the treated samples were characterized by infrared spectroscopy, scanning electron microscope, UV-vis spectrophotometer and sun protection factor (SPF) measurement. Experimental results showed that, the upgrading effect for UV absorbance within whole wave length range by simple increase of hemp powder mass fraction is very limited. Effect of increase of treating time of ball mill grinding for improving light absorbance is not obvious. Comparing the samples that treated by separate kinds of acid and the sample without any treatment, results showed that acetic acid displays the highest light absorbance. Comparing the samples that treated by separate kinds of alkali and the sample without any treatment, results showed that triethanolamine displays the highest light absorbance, even higher than that treated by acetic acid. After the treatment of acid or alkali, the peak intensity of infrared absorption of the hemp powder decreases, but its irregular chip structure remains unchanged. Comparing the sun protection factor of samples that treated by the separate methods, results showed that the sample treated by alkali displays the highest SPF value.