Effect of cryogrinding on particle size of waste tyre derived reclaimed rubber

Danabal, Diness Kumar (2022) Effect of cryogrinding on particle size of waste tyre derived reclaimed rubber. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

Significant growth in the automobile industry boosted tire production contributing to the huge stock piles of waste tires. Retreading of worn rubber tires became an example of remanufacturing and waste dust produced from tire retreading is also reusable, but cannot be used directly in rubber processing due to the presence of impurities, hence it must be reclaimed to remove contaminants using chemical method. The problem statement gearing the research is that blend produced from the reaction between WTRR sheet through chemical separation method with SMR sheet will have deteriorated properties because of the chemical process involved and dimension effect of the sheet. Therefore, cryo-pulverization process was introduced to retrieve the sheet into particle sizes. The research objectives are to study the effect of cryogrinding on the particle size of WTRR and to investigate the effect of cryogrinding on the surface microstructure of WTRR particles. For this research, the WTRR pieces were ground cryogenically into powder form followed by particle characterization using sieve with aperture width of 5mm, 4mm, 3.15mm, 2mm and 1mm. Powder characteristics including the particle size distribution and surface area were explored as well as calculated respectively. Subsequently, the surface microstructure of the WTRR particles were observed through an Optical Nikon Microscope and Scanning Electron Microscope to study the physical texture of the cryoground WTRR particles. The results from the study indicates that grinding the cryogenically-prepared WTRR through commercial blender possess a quite large particles with majority the sieved ground fragment falls in the sieve of 5 mm with weight percentage of 60.56 wt % as well as have low total calculated average surface area of 1.50 mm²/g. Also, the surface microstructure of the cryogenically-prepared particles possesed rough texture with an uneven irregular shape after grinding. All findings present confirms that, although particles produced from the commercial blender is large in size yet this technology as the grinding equipment for the cryogenic technique can be a good choice to modify the smooth surface of the cryogenically-prepared WTRR to be rough.

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