混合脂肪酸钠辅助制备硫酸钙晶须

doi:10.19964/j.issn.1006-4990.2021-0470

Abstract

Abstract:

Calcium sulfate whiskers have merit of wide range of applications，excellent comprehensive performance and cost?effective，resulting in good application prospects.Calcium chloride was used as the main raw material，sodium oleate，sodium stearate，and a mixture of sodium oleate and sodium stearate were used as crystal growth promoters.The normal pressure acidification method was used to prepare whiskers of high aspect ratio and good hydrophobicity.The influence of calcium chloride concentration，reaction time，reaction temperature，the amount of sodium oleate，sodium stearate and their mixture on aspect ratio and hydrophobicity of calcium sulfate whisker was studied，and the optimal preparation conditions were determined.The products were characterized by scanning electron microscopy（SEM），contact angle measuring instrument，X-ray diffraction（XRD），infrared spectroscopy（FT-IR），and Zeta potential analysis.The optimal conditions for the preparation of calcium sulfate whiskers were listed as follows：mass concentration of calcium chloride solution of 0.11 g/mL，adding 4.8 mL of concentrated sulfuric acid in the amount of calcium chloride，adding the mixture of 4% sodium oleate and 6% sodium stearate（calculated by mass fraction） as modifier，stirring in oil bath at 140 ℃ for 1 h.Under this optimal conditions，the aspect ratio of prepared calcium sulfate whiskers was ranged from 32 to 106，and the contact angle reached 120.2°.XRD results showed that the obtained calcium sulfate whiskers were a mixture of hemihydrate calcium sulfate whiskers and dihydrate calcium sulfate whiskers.Infrared spectroscopy and Zeta potential analysis showed that sodium oleate and sodium stearate were adsorbed onto the surface of whiskers in the form of chemical adsorption.When the mixture of sodium oleate and sodium stearate was added，sodium oleate and sodium stearate were co?adsorbed on the whiskers surface，which made the surface of whisker adsorb more fatty acids and the hydrophobicity of whisker stronger.

Key words: atmospheric acidification method, fatty acid, calcium sulfate whisker, aspect ratio, hydrophobicity

CLC Number:

TQ132.32

LI Ming,LI Zhili,ZHANG Zeqiang,HE Dongsheng,TANG Yuan,CHEN Fei. Preparation of calcium sulfate whiskers assisted by mixed sodium fatty acid[J]. Inorganic Chemicals Industry, 2022, 54(6): 66-72.

Figures/Tables 10

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Table 1

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References 14

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编号	实验条件	晶须长径比	文献
1	以十二烷基硫酸钠为改性剂，氯化钙质量浓度为20 g/L，反应时间为1 h，pH=2，静置时间为2 h	半水硫酸钙晶须长径比达到50	［7］
2	2 g脱硫石膏，120 mL质量分数为20%的H₂SO₄溶液，在120 ℃加热搅拌2 h，添加1%（以质量分数计）柠檬酸，过滤、洗涤，在100 ℃干燥5 h	晶须长径比约为30	［8］
3	硫酸钠与氯化钙物质的量比为1∶1，反应物浓度为1.0 mol/L，加入5 mL无水乙醇，在80 ℃反应30 min，搅拌转速为70 r/min	二水硫酸钙晶须长径比为40	［11］
4	稀土石膏质量浓度为0.22 g/mL，反应时间为25 min，盐酸浓度为2.8 mol/L，反应温度为70 ℃，陈化时间为4 h	硫酸钙晶须平均长径比为 30.5	［12］
5	Ca（NO₃）₂质量分数为30%，磷石膏质量分数为12%，pH为3，反应温度为103 ℃，反应时间为4 h	硫酸钙晶须平均长径比为53	［13］

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Preparation of calcium sulfate whiskers assisted by mixed sodium fatty acid

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