Control of Material Properties by Coating of Fine Particles with High-Speed Rotational Impact Blending

通过高速旋转冲击混合涂覆细颗粒来控制材料性能

基本信息

批准号：
11650771
负责人：
SHINOHARA Kunio
金额：
$ 2.37万
依托单位：
HOKKAIDO UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2000
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-11650771/
关键词：
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

项目摘要

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.

首先，通过高速旋转冲击混合和在砂浆中的手动混合以及细颗粒的混合比，处理时间，旋转速度和粗颗粒的平均直径与混合程度一起研究了粗白色的红乙烯颗粒，并通过高速旋转冲击混合和手工混合通过高速旋转冲击混合和手工混合。发现以旋转影响的混合比的混合时间小于100％，混合时间的混合程度降低了100％以上的比率，并且由于混合度的增加而导致的轻度降低到低于手动混合，但在冲击混合过程中几乎保持恒定。这意味着颗粒的轻度在很短的混合时间内达到了稳态，从而导致使用旋转冲击搅拌器时的细颗粒量减少了相同的轻度效果。然后，将二氧化钛粉末用作细颗粒，通过旋转冲击混合物涂层粗尼龙和聚乙烯颗粒。研究了涂层比和粗颗粒的大小的影响，对紫外线衰减的有效性进行了研究。发现紫外线保护的有效性通过降低涂层比增加，因为这导致形成较低水平的表面团聚物。将大型聚合物颗粒涂上二氧化钛的大型聚合物颗粒的进一步优势是散装分散体的改善，从而获得了最佳的紫外线保护。