The Optimum Condition for Artificial Wood Production from Compression Moulding Process สภาวะที่เหมาะสมสำหรับการผลิตไม้เทียมโดยกระบวนการ

  • Jutatip Artchomphoo สาขาวิชาเทคโนโลยียางและพอลิเมอร์ คณะวิทยาศาสตร์และเทคโนโลยี มหาวิทยาลัยเทคโนโลยีราชมงคลศรีวิชัย
  • Suwat Rattanapan สาขาวิชาเทคโนโลยียางและพอลิเมอร์ คณะวิทยาศาสตร์และเทคโนโลยี มหาวิทยาลัยเทคโนโลยีราชมงคลศรีวิชัย
  • Chatchai Kaewdee สาขาวิชาเทคโนโลยีอุตสาหกรรม คณะเทคโนโลยีอุตสาหกรรม มหาวิทยาลัยราชภัฎนครศรีธรรมราช
  • Weerayute Sudsomboon สาขาวิชาเทคโนโลยีอุตสาหกรรม คณะเทคโนโลยีอุตสาหกรรม มหาวิทยาลัยราชภัฎนครศรีธรรมราช
Keywords: artificial wood, composite, sawdust powder

Abstract

Artificial woods were mixed from rubber and sawdust powder. The research studied the artificial wood moulding temperature (125, 135, 145, and 155oC), composite accelerator (zinc- N-diethyl dithiocarbamate (ZDEC), tetramethyl thiuram disulphide (TMTD), 2-mercapto benzothiazol disulfide (MBTS), N-cyclohexyl-2-benzothiazole sulfenamide (CBS), and N,N-diphenyl guanidine (DPG)) and the mechanical properties of artificial wood with the mixture of sawdust powder (20, 40, 60, 80, 100 phr). It was found that the curing time of artificial wood decreased according to the increasing temperature. All types of accelerators used in this case could be completely moulded to artificial wood at 125oC and 135oC, except for the ZDEC that the moulded temperature could not be higher than 125oC. However, both temperatures were not appropriate for production as it took more than 60 and 30 minutes to complete the product, respectively. For artificial wood with a thickness of 15 mm, the use of MBTS, the mixture of MBTS and DPG, and CBS could be completely molded at 145oC, but for artificial wood with a thickness of 25.4 mm, only MBTS and the mixture of MBTS and DPG can provide the most complete moulding. The mixture of MBTS and DPG provided the highest cure rate index. There were cycle times of 16.45±0.03 minutes and 18.45±0.04 minutes for artificial woods with the thickness of 15 and 25.4 mm., respectively. The amount of sawdust powder in composite materials also affected the mechanical properties of artificial wood. The increase of the wood sawdust increased the stiffness of the wood, with the highest tensile strength and the decreased elongation at break. However, the modulus at 100% elongation and hardness of artificial wood increased. It was found that the use of sawdust at 100 phr could increase the hardness of artificial wood by more than 80 shore A. By using wood sawdust sizes of 500-1000 micrometer, the hardness of artificial wood could increase to the highest level at 88±0.53 shore A. In addition, the use of grafted natural rubber with 8 and 10 phr of malic anhydride (NRgMAH8 and NRgMAH10) as a binding agent created a bond between the phase of the sawdust powder and the rubber matrix, making the artificial wood stronger.

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Published
2020-06-28
Section
บทความวิจัย (Research Articles)