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油酸甲酯乙氧基化物耐酸耐碱性研究
张 勇, 孙永强, 丁莉荣, 周婧洁, 孙晋源, 梁慧斌
中国日用化学工业研究院,山西 太原 030001
摘要:
将油酸甲酯乙氧基化物(OMEE)作为研究对象,通过FT-IR鉴定结构;分别采用国标法和质量法定性、定量测定FMEE和OMEE耐酸耐碱性。由实验结果可知,OMEE与常规饱和脂肪酸甲酯乙氧基化物(FMEE)在结构上存在碳碳双键的差异;国标法不适用于脂肪酸甲酯乙氧基化物耐酸耐碱性的测定;在任意pH值,OMEE的水解率始终高于FMEE;在pH=13时,FMEE和OMEE水解速率最快,且在170 h时OMEE水解完全;FMEE在pH=2~9、500 h时水解率仍小于20%;OMEE在pH小于13时,水解率受pH和时间影响较小。
关键词:  脂肪酸甲酯乙氧基化物  耐酸性  耐碱性  国标法  水解率  定性分析
DOI:10.13218/j.cnki.csdc.2018.06.004
分类号:TQ423.2
基金项目:国家重点研发计划资助项目(2017YFB0308800);山西省重点研发计划(指南)项目(201603D421036);伽蓝研究基金资助项目(JALA2015)
Study on the acid and alkali resistance of oleic acid methyl ester ethoxylate
Abstract:
Oleic acid methyl ester ethoxylate (OMEE) was characterized by FT-IR. The acid and alkali resistance of fatty acid methyl ester ethoxylate (FMEE) and OMEE were measured qualitatively and quantitatively by national standard method and mass method, respectively. The experimental results show that, the structure of OMEE is different from that of conventional saturated FMEE because of the presence of carbon-carbon double bond. The national standard method is not suitable for the determination of acid or alkali resistance of FMEE. The hydrolysis rate of OMEE is always higher than that of FMEE at any pH. The hydrolysis of both FMEE and OMEE are the fastest at pH 13, and OMEE has been hydrolyzed completely at 170 h. At pH 2~9, the hydrolysis rate of FMEE is still less than 20% during the period of 500 h. In additon, the hydrolysis rate of OMEE has been little affected by either pH or time when the pH is less than 13.
Key words:  fatty acid methyl ester ethoxylate  acid resistance  alkali resistance  national standard method  hydrolysis rate  qualitative analysis

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