著者

舘 和幸

出版者

一般社団法人 色材協会

雑誌

色材協会誌 (ISSN:0010180X)

巻号頁・発行日

vol.94, no.1, pp.9-16, 2021

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<p>エア霧化塗装,回転霧化静電塗装について,被塗装面の近傍領域における塗料粒子の状態(径,比電荷,速度)と塗料粒子の飛行空間の状態(エア速度,電界強度など)を二次元でモデル化し,塗着効率が全塗料粒子の単なる軌道の問題としてシミュレーションで求められることを示した。さらに,その結果に基づき,実用面において塗着効率を向上させるためには,塗料の微粒化の最適化,比電荷や電界強度の増大,さらに必要に応じてパターンの狭小化が有効なことを説明した。また,塗着効率100%の塗装技術として期待されるインクジェット塗装は,生産性(時間当たりの塗装面積)が飛躍的に向上しない限り,自動車ボデーの塗装工程での採用は難しいことを示した。</p>

著者

中村 浩 舘 和幸

出版者

一般社団法人 日本レオロジー学会

雑誌

日本レオロジー学会誌 (ISSN:03871533)

巻号頁・発行日

vol.27, no.3, pp.161-164, 1999-09-15 (Released:2000-03-28)

参考文献数

8

被引用文献数

3 3

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Effects of base hydrophobicity on a flow behavior and a microstructure of aqueous suspension of core-shell type carboxylated polymer particle have been studis. The suspension was neutralized by NaOH, dimetylaminoethanol(DMAE), dimetylaminopropanol(DMAP) and dimetylaminobutanol(DMAB). Steady shear flow was measured with a coni-clinder rotational rheometer, and microstructure was examined with a dynamic oscillating shear method and the small angle X-ray scattering(SAXS) method. The hydrophobicity is DMAB>DMAP>DMAE>NaOH. The distance ξ between center to center of neighboring particles in ordered structure made of the particles was measured by SAXS method. In case of NaOH, the suspension indicated shear-thinning flow. Loss tangent tan δ was below 1(G'>G") in all frequency region and a diffraction peak in SAXS profile was detected. These results show the three dimensional network structure of ordered structure is formed in the suspension. As the hydrophobicity increased, viscosity and degree of shear-thinning decreased, tan δ became above 1 in almost frequency region and the height of diffraction peak decreased without changing ξ. These results suggest that, as the base hydrophobicity increased, the three dimensional network structure reduces to the isolated domain structure, though the distance between neighboring particles in ordered structure does not change.

著者

原田 雅史 舘 和幸 鈴木 泰彦 池野 順一 梅村 晋

出版者

一般社団法人 日本レオロジー学会

雑誌

日本レオロジー学会誌 (ISSN:03871533)

巻号頁・発行日

vol.34, no.2, pp.71-75, 2006 (Released:2006-06-14)

参考文献数

10

被引用文献数

2

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Viscosity is a key property controlling the appearance of automotive coatings. However, the direct measurements of the viscosity in automotive coatings have not been achieved, since the automotive coating is a complex system consisting of a multilayer where mass transfer occurs between each thin layers. Using the laser trapping method, we have developed a rheometer to realize non-destructive viscosity measurements of the multilayers. Applying the new rheometer to automotive coatings, the viscosity has been estimated for (A) a clearcoat itself, (B) a clearcoat on a basecoat, and (C) a clearcoat on a basecoat and a surfacer. The results demonstrate an increase of viscosity in the order of (A) < (B) < (C), depending on the thickness of the lower layers. The viscosity increase suggests that the concentration of the clearcoat is likely to increase due to the diffusion of the solvent into the lower layers.