柠檬酸对半水硫酸钙晶须形貌稳定性影响
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摘要
介绍了柠檬酸对半水硫酸钙晶须的形貌稳定性的影响及其作用机制,重点考察了柠檬酸添加量及稳定化温度对晶须形貌稳定性的影响。采用XRD、SEM和红外光谱表征晶须性质。结果表明,在30～100℃范围内,随着稳定化温度的增加,半水硫酸钙晶须形貌稳定时间增长。其中在100℃,柠檬酸添加量为0. 5wt%,半水硫酸钙形晶须形貌稳定时间可达4. 0 h。由于柠檬酸的-COO-与半水硫酸钙晶须表面Ca2+键和成-COO-Ca-结构,柠檬酸以化学吸附方式吸附于晶须表面,使得晶须稳定性提高。
The effect of citric acid on the morphology stability of calcium sulfate hemihydrate and its mechanism of action were studied. The effects of stabilization temperature and the addition of citric acid were investigated. The hydration products were characterized by XRD,SEM and IR spectra. The results implies that the stability of the calcium sulfate hemihydrate whiskers strengthened with the increase of the stabilization temperature in the range of 30 ℃ to 100 ℃. Among them,when the addition of citric acid was 0. 5 wt% at 100 ℃,the stabilization time of calcium sulfate hemihydrate increased to 4. 0 h. Due to the formation of-COO-Ca-structure between-COO-of citric acid and Ca2 +of whiskers,citric acid adsorbs on the surface of whisker by chemical adsorption,enhancing the morphology stability of whiskers.
The effect of citric acid on the morphology stability of calcium sulfate hemihydrate and its mechanism of action were studied. The effects of stabilization temperature and the addition of citric acid were investigated. The hydration products were characterized by XRD,SEM and IR spectra. The results implies that the stability of the calcium sulfate hemihydrate whiskers strengthened with the increase of the stabilization temperature in the range of 30 ℃ to 100 ℃. Among them,when the addition of citric acid was 0. 5 wt% at 100 ℃,the stabilization time of calcium sulfate hemihydrate increased to 4. 0 h. Due to the formation of-COO-Ca-structure between-COO-of citric acid and Ca2 +of whiskers,citric acid adsorbs on the surface of whisker by chemical adsorption,enhancing the morphology stability of whiskers.
引文
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[2]黄明杰,张晓莹,余荆丽.硫酸钙晶须在涂料中的应用综述[J].现代涂料与装,2013,16(11):18-19+26.
[3] Jiang G M,Li J X,Nie Y L,et al. Immobilizing water into crystal lattice of calcium sulfate for its separation from water-in-oil emulsion[J].Environ. Sci. Technol. 2016,50:7650-7657.
[4] Yang H C,ASCE M,Tasi T P. Enhanced soundproof performance of construction coatings using polyvinyl acetate resin and calcium sulfate whiskers[J]. Mater. Civ. Eng. 2016,28(12):04016168.
[5]韩跃新,王宇斌,袁致涛,等.半水硫酸钙晶须水化过程[J].东北大学学报(自然科学版),2008,29(10):1490-1493.
[6]刘红叶,刘富玲,王宇斌,等.磷酸钠对半水硫酸钙晶须的稳定作用[J].化工矿物与加工,2011,4:11-13.
[7]刘天杰,范浩,许妍霞,等,水化时间和温度对半水硫酸钙晶须水化过程的影响[J].华东理工大学学报(自然科学版),2018,44(01):9-14.