| Project/Area Number |
11650771
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
化学工学一般
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| Research Institution | HOKKAIDO UNIVERSITY |
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Principal Investigator |
SHINOHARA Kunio Hokkaido Univ., Grad.School of Eng., Prof., 大学院・工学研究科, 教授 (60001294)
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| Co-Investigator(Kenkyū-buntansha) |
UCHIYAMA Tomoyuki Hokkaido Industrial Research Institute, Researcher, 資源エネルギー部, 研究職員
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| Project Period (FY) |
1999 – 2000
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| Project Status |
Completed (Fiscal Year 2000)
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| Budget Amount *help |
¥3,700,000 (Direct Cost: ¥3,700,000)
Fiscal Year 2000: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 1999: ¥2,800,000 (Direct Cost: ¥2,800,000)
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| Keywords | Surface composite particle / Mixing ratio / Coating ratio / Degree of mixing / Lightness / Rotational impact blending / UV attenuation effectiveness / Rotational Impact Blending / Surface Coating / Fine Particle / Material Properties / Colour / Mixing |
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| Research Abstract |
First, coarse white polyethylene particles were coated by fine pigment particles of red iron oxide by high-speed rotational impact blending and by hand mixing in a mortar, and the effects of the mixing ratio of fine particles, the treatment time, the rotational speed and the mean diameter of coarse particles were investigated with respect to the degree of mixing. It was found that the degree of mixing increased with the treatment time at a mixing ratio of less than 100%, but decreased the ratio of over 100% by rotational impact, and that the lightness decreased to lower than that by hand mixing due to the increased degree of mixing, but remained almost constant during the impact blending. This means that the lightness of particles reached a steady state in a very short mixing time, resulting in the reduction of the amount of fine particles for the same lightness effect when using the rotational impact blender. Then, titanium dioxide powder was used as the fine particles to coat coarse nylon and polyethylene particles by the rotational impact blending. The effects of coating ratio and size of the coarse particles were investigated on the effectiveness of UV attenuation. The effectiveness of UV protection was found to be increased by decreasing the coating ratio, as this led to a lower level of surface agglomerates being formed. A further advantage of coating large polymer particles with fine titanium dioxide was an improvement in the bulk dispersion, which resulted in optimum UV protection.
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