폐타이어 재활용을 위한 미세분말화공정과 분자구조개질에 관한 연구
(A) Study on utilization of waste tire by fine powder processing and modification of molecule structure
폐타이어 재활용 미세분말화공정 분자구조개질 고분자공학 화학공학;
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The great numbers of waste tire have been significant problems with the increasing in number of automobiles each year. The recycling of waste tire can be divided into three categories its use as heat by incineration, as the original sharp, and as grinding of waste tire to increase mechanical properties. One of the main approaches to rubber recycling is reclaiming or devulcanization. It took a long time to develop several kinds of recycling waste tires including microwaves, bioreactor, milling and another devulcanization technique. The advantage of powder utilization is that it is easy to apply with simple equipment. Although much work has been done, problems still remain. The difficulties in recycling of the waste tires are the scrap of tire is a cross-linked polymer which inducing hard to melt and to process. Generally, methods of obtaining powder from the waste tires are cryogenic grinding and ambient grinding. In cryogenic grinding, shredded tires are frozen in a liquid nitrogen. The cryogenic ground rubber has a smaller particle size and lower surface area compared to an ambient ground rubber. But the cryogenic grinding is more expensive process than the ambient grinding. The most common surface treatment of materials, whereby oxygen-containing functional group are formed on the surface of the materials. The oxidation can be achieved by air, oxygen and ozone. In this work, ozone treatment was used to oxidize the rubber powder, We have greatly improved the effectiveness of rubber powder for mechanical properties. In addition, we applied ultrasonic reactor to rubber powder using continuous system. The ultrasonic waves of certain levels in the presence of pressure and heat rapidly break up the three dimensional network in cross-linking rubbers. The mechanism of degradable of cross-linked elastomers is still in debate. However, it is believed that most of the physical effects caused by ultrasonic are usually attributed to cavitation, the rapid growth and contraction of micro-bubbles as high intensity sound wave propagates in the rubber. The development of suitable technology is an important issue facing the rubber industry. In this study, we developed a high value products and using cheaper rubber powder. First, we designed a grinding machine and Second studied, ozone/ultrasonic devulcanization in our laboratory. The application of ozone/ultrasonic technique in the process of devulcanization is still new. This technique is applied to increase mechanical properties and the possibility of continuous process of waste tire treatment. Futhermore, we tried to make good and economically rubber ballast-mat and rubber block using surface modification rubber powder.
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