| Project/Area Number |
18K04803
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Review Section |
Basic Section 27010:Transport phenomena and unit operations-related
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| Research Institution | Tohoku Institute of Technology (2019-2022)
Tohoku University (2018) |
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Principal Investigator |
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| Project Period (FY) |
2018-04-01 – 2023-03-31
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| Project Status |
Completed (Fiscal Year 2022)
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| Budget Amount *help |
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2020: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2019: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2018: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
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| Keywords | viscosity / polymer solution / gas expanded liquid / CO2 Painting |
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| Outline of Final Research Achievements |
The CO2 spray coating system is attracting much attention to reduce emissions of volatile organic compounds. In this study, the method for estimating the viscosity of a polymer solution + CO2 systems was developed, which is important for selecting coating conditions. Using the Hansen solubility parameter of the polymer solution + CO2 system, we developed the model that can be applied to the viscosity estimation of the CO2 addition system based on the existing relational expression between the solubility parameter and the intrinsic viscosity. In this model, the parameters in the model were determined from the experimental data for a certain polymer solution system, but it was confirmed that it is also applicable to other types of polymer solutions. The mean relative deviation between the estimated and experimental values for the CO2-added system was 7.4%, showing good agreement.
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| Academic Significance and Societal Importance of the Research Achievements |
VOC (揮発性有機化合物) の環境への放出は深刻な問題である。日本の最大の VOC 排出源である塗料業界は、VOC削減技術を模索してきた。このため、溶剤の一部を高圧のCO2に置き換えるCO2塗装システムが注目されている。従来は、CO2の添加による貧溶媒効果によりポリマーが析出するなどの問題があり、実用化に至らなかったが、申請者らの研究により、析出を防ぐ真溶剤の選定法が示された。塗料粘度に関しても推算可能となればVOC削減量の推定が可能となるため、CO2塗装システムの実用化を促進するために重要である。学術的にもCO2を含むポリマー溶液の粘度推算は手が付けられていない分野であり、新規性も高い。
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