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Effects of burning temperature and K2O on preparation of silica from rice husk ash for anti-blocking application in LLDPE film

หน่วยงาน จุฬาลงกรณ์มหาวิทยาลัย

รายละเอียด

ชื่อเรื่อง : Effects of burning temperature and K2O on preparation of silica from rice husk ash for anti-blocking application in LLDPE film
นักวิจัย : Verasak Mosungnoen
คำค้น : Plastic films , Rice hulls , Potassium , Silica
หน่วยงาน : จุฬาลงกรณ์มหาวิทยาลัย
ผู้ร่วมงาน : Wada, Shigetaka , Wannee Chinsirikul , Chulalongkorn University. Faculty of Science
ปีพิมพ์ : 2549
อ้างอิง : 9741425783 , http://cuir.car.chula.ac.th/handle/123456789/14466
ที่มา : -
ความเชี่ยวชาญ : -
ความสัมพันธ์ : -
ขอบเขตของเนื้อหา : -
บทคัดย่อ/คำอธิบาย :

Thesis (M.Sc.)--Chulalongkorn University, 2006

Amorphous silica (SiO) in rice husk ash (RHA) was transformed to cristobalite with some amount of tridymite at over 900 degree celsius. The RHA included about 2 wt% of potassium oxide (K[subscript 2] O). The K[subscript 2]O played an important role in reducing the melting temperature of SiO[subscript 2] in RHA and in re - crystallization of amorphous silica to cristobalite at lower temperature. The RHA from rice mill factory was transformed to cristobalite/tridymite by heat treatment at 1,200 degree celsius for 4 h. Such resulting powder was ground with air jet mill and mixed to make a masterbatch with linear low density polyethylene (LLDPE) by twin-screw extruder. LLDPE film was prepared by a common film blowing extruder. Film properties containing commercial grade anti-blocking cristobalite was compared with the film containing cristobalite from rice husk, prepared in this study. It was found that transparency and mechanical tensile strength of the two film types were relatively the same. However, some reports published in other countries indicate that cristobalite is considered as a carcinogenic material. Amorphous silica is, so far, another candidate for use as anti-blocking agent in plastic films. From this study, amorphous silica could be produced by a similar process as compared to that for cristobalite, but at lower burning temperature of 650 degree celsius for 1 h. The optical and tensile properties of the films with amorphous SiO[subscript 2] is equivalent to those containing cristobalite.

บรรณานุกรม :
Verasak Mosungnoen . (2549). Effects of burning temperature and K2O on preparation of silica from rice husk ash for anti-blocking application in LLDPE film.
    กรุงเทพมหานคร : จุฬาลงกรณ์มหาวิทยาลัย.
Verasak Mosungnoen . 2549. "Effects of burning temperature and K2O on preparation of silica from rice husk ash for anti-blocking application in LLDPE film".
    กรุงเทพมหานคร : จุฬาลงกรณ์มหาวิทยาลัย.
Verasak Mosungnoen . "Effects of burning temperature and K2O on preparation of silica from rice husk ash for anti-blocking application in LLDPE film."
    กรุงเทพมหานคร : จุฬาลงกรณ์มหาวิทยาลัย, 2549. Print.
Verasak Mosungnoen . Effects of burning temperature and K2O on preparation of silica from rice husk ash for anti-blocking application in LLDPE film. กรุงเทพมหานคร : จุฬาลงกรณ์มหาวิทยาลัย; 2549.