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A Basic Study on Material Selection Process from Waste Polymers Utilizing Unsteady Heat Conduction

利用非稳态热传导废旧聚合物选料工艺的基础研究

基本信息

批准号：
12450083
负责人：
SATOH Isao
金额：
$ 9.09万
依托单位：
Tokyo Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2000
资助国家：
日本
起止时间：
2000 至 2002
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-12450083/
关键词：
Waste Polymers Selection of Materials Unsteady Heat Conduction Sticking Phenomenon Interface Temperature Softening Rheological Properties Contact Area 接触界面形状汚れ塗膜選別能

项目摘要

In this research project, sticking phenomenon occurring between a polymer particle and a heated solid surface has been experimentally investigated, in order to obtain basic understandings about the material selection process from waste polymers, which are the mixture of various kinds of polymer materials, utilizing unsteady heat conduction and the sticking phenomenon occurring between the polymer and the heated surface. Obtained results are summarized as follows :(1) Sticking phenomenon of polymer particles occurring on a heated solid surface was investigated for various kinds of polymer materials. As the results, it was shown that the sticking between a polymer and a heated surface becomes evident when the initial temperature of heated surface exceeds a certain temperature (an onset temperature), and that the onset temperatures almost correspond to the glass-transition temperature or the melt temperature of polymeric materials and therefore differ for different kind of polymers. This … More means that the waste polymer of various kinds of materials may be separated in each material by utilizing the sticking phenomenon.(2) In general, waste polymer may have dirt or paint on its surface. Effects of the dirt or paint on the sticking phenomenon were experimentally examined. The results clearly showed that the dirt on the surface of polymer particles results in a slight rise of the sticking onset temperature, but that the sticking characteristics of polymer particles are hardly influenced by the dirt. To the contrary, paint on the polymer particles markedly affects the sticking characteristics. The sticking onset temperature becomes the middle of those for the base polymer and for the paint material.(3) The interface temperature at the contact point between a polymer particle and a heated surface was measured for various polymer materials and for various initial temperature of the heated surface. The results showed that, under the condition that the sticking between a polymer and a heated surface becomes evident, the interface temperature is a little bit higher than the glass-transition temperature/melt temperature of the polymer material. This results suggests that the sticking of polymeric materials is dominated not only by the "softening" of the polymer, but also by the enlargement of contact area due to deformation of polymer around the contact point.(4) Rheological properties of polymeric materials were measured around the sticking onset temperature in detail. It was shown that the sticking between a polymer and a heated surface becomes evident when the loss tangent of the polymer exceeds unity, and that under the condition the values of storage/loss moduli are about 10^6 Pa and are independent on the kind of polymer materials. Less

本研究项目对聚合物颗粒与受热固体表面之间的粘连现象进行了实验研究，以期对利用各种聚合物材料的非稳态热传导以及聚合物与受热表面之间发生的粘连现象进行选材的过程有一个基本的了解。主要研究结果如下：(1)研究了不同类型的聚合物材料在加热固体表面上发生的聚合物颗粒粘连现象。结果表明，当受热表面的起始温度超过某一温度(起始温度)时，聚合物与受热表面之间的粘结变得明显，并且起始温度几乎与聚合物的玻璃化转变温度或聚合物材料的熔体温度相对应，因此对于不同种类的聚合物来说，粘附性是不同的。此…更多的是指各种材料的废旧聚合物可以利用粘连现象在每种材料中分离出来。(2)一般来说，废旧聚合物的表面可能有污垢或油漆。通过实验考察了污垢或油漆对粘连现象的影响。结果表明，聚合物颗粒表面的污垢使聚合物颗粒的粘接起始温度略有升高，但对聚合物颗粒的粘接特性几乎没有影响。相反，涂料对聚合物颗粒的粘接特性有显著影响。对于不同的聚合物材料和不同的受热表面初始温度，测量了聚合物颗粒与受热表面接触点的界面温度。结果表明，在聚合物与受热表面粘结明显的情况下，界面温度略高于聚合物材料的玻璃化转变温度/熔体温度。这一结果表明，聚合物材料的粘结不仅受聚合物的“软化”影响，还受接触点附近聚合物变形引起的接触面积扩大的影响。(4)详细测量了聚合物材料在粘接起始温度附近的流变性能。结果表明，当聚合物的损耗角正切大于1时，聚合物与受热表面之间的粘结变得明显；在此条件下，聚合物的存储/损耗模数值约为10^6Pa，与聚合物材料的种类无关。较少