Drying rate of latex coating affected by the deformability of resin particles in convection drying

Drying rate of latex coating affected by the deformability of resin particles in convection drying
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对流干燥中树脂颗粒变形能力对乳胶涂料干燥速率的影响

DOI:
10.1140/epje/s10189-021-00155-1
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发表时间:
2022
期刊:
The European Physical Journal E
影响因子:
--
通讯作者:
Ohmura Naoto
Ohmura Naoto
中科院分区:
--
文献类型:
--
作者:
Tanaka Hiroaki;Komoda Yoshiyuki;Horie Takafumi;Imakoma Hironobu;Ohmura Naoto

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乳胶漆应用广泛,许多研究人员指出,成膜过程取决于分散聚合物颗粒的变形能力。然而,由于缺乏整个干燥过程中干燥速率的准确数据,成膜过程与干燥速率之间的关系尚未完全了解。在本研究中,我们通过 Imakoma 提出的对流干燥中的温度变化方法测量了乳胶涂层的干燥速率。我们发现干燥过程很大程度上取决于颗粒的变形能力,特别是在干燥速率下降的前阶段。在低干燥温度下,在恒定干燥速率期结束时,在整个薄膜中形成聚合物颗粒的密堆积结构。另一方面,即使在高含水量和高干燥温度下,由于湿法烧结而导致部分变形的软颗粒也会抑制干燥速率。无论哪种情况,在形成最密堆积结构后,由于毛细管变形而导致颗粒之间间隙空间的收缩都会降低干燥速率,与水分含量成正比。图形摘要
Latex paints are widely used, and many researchers pointed out that the film formation process depends on the deformability of dispersed polymer particles. However, the relationship between the film formation process and drying rate has not been totally understood due to the lack of accurate data on drying rate throughout the drying process. In the present study, we measured the drying rate of latex coating by the temperature change method proposed by Imakoma in convective drying. We revealed that the drying process significantly depends on particle deformability, especially in the former stage of the falling drying rate period. At a low drying temperature, the close-packed structure of polymer particles is formed throughout the film at the end of the constant drying rate period. On the other hand, partially deformed soft particles due to wet sintering inhibit the drying rate even under high moisture content at high drying temperatures. In either case, after forming the closest-packed structure, the shrinkage of the gap space between particles due to capillary deformation decreases the drying rate, proportional to the moisture content.Graphic abstract
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