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| Preparation and viscosity regulation of coconut oil-based neopentyl glycol adipate oligoesters |
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| DOI： |
| KeyWord:coconut oil neopentyl glycol adipic acid oligoesters polymerization degree viscosity regulation |
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| Author Name | Affiliation | | HE Jieyu1,2, WANG Ze1, ZHU Jiaping1, JIN Yunkang1 | 1.College of Marine Science & Technology, Hainan Tropical Ocean University, Sanya 572022,Hainan, China
2.Editorial Department of University Journal, Hainan Tropical Ocean University, Sanya 572022, Hainan, China |
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| Abstract: |
| To obtain naturally renewable and environment-friendly coconut oil-based ester lubricants with a wide viscosity range, the intermediates with different average oligomerization degrees were firstly synthesized by the esterifications of neopentyl glycol (NG) with adipic acid (AA), and then esterified respectively with coconut oil fatty acid to prepare a series of coconut oil-based neopentyl glycol adipate oligoesters (referred to as oligoesters) with variable viscosity. The effects of main synthesis conditions of water-entrainers agent type, reaction temperature, reaction time, molar ratio of NG to AA(nNG/nAA) on the conversion and average polymerization degree were investigated. FTIR spectra of the intermediates with different average polymerization degree and their oligoesters were compared and analysed, also the viscosity of the oligeoesters of intermediates with different average oligomerization degrees were determined. The results showed that the effect of nNG/nAA on the average polymerization degree of intermediates was significant, the conversion of the intermediates under the optimal synthesis conditions with toluene as water-entrainers agent, reaction temperature 130℃ and reaction time 3.0 h could reach 91.2%-98.2% and the average polymerization degree could reach 1.63-6.85 when adjusting nNG/nAA as 1.2∶ 1-3.5∶ 1. And a series of oligoesters with viscosities ranging of 54.6-378.2 mm2/s (40℃) and 8.8-56.5 mm2/s(100℃) could be obtained by the intermediates produced. In summary, coconut oil-based neopentyl glycol adipate oligoesters with a wide viscosity range are successfully prepared, and the molar ratio of neopentyl glycol to adipic acid is a desirable viscosity control factor for the preparation of oligoesters. |
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