A development of low density polyethylene composites made with rice husk
At present, plastic is widely used in our modern daily lives for comfort and convenience.
1.2.1 To obtain the information of the new composite plastic’s properties with different ratio between polyethylene and rice husk.
1.2.2 To obtain the best combination ratio between polyethylene and rice husk which yields the highest quality of the new composite plastic and greatest minimizing of plastic usage.
1.3 boundary of studying
1.3.1 Produce the composite plastic with the combination of rice husk of 10%, 20%, 30%, and 40% of low density polyethylene mass and test for its properties.
1.4 Expected result
1.4.1 Obtain the best ration of combination, yielding the best quality and greatest minimization of plastic usage.
1.4.2 Obtain a high quality composite plastic from low density polyethylene and rice husk which can replace the original plastic.
1.4.3 Reduce the usage of polyethylene at present.
2.1 Low density polyethylene Low - density poly ethylene (LDPE) is a thermoplastic made from o il. It was the first grade of polyethylene, produced in 1933 by Imperial Chemical Industries ( ICI ) using a high pressure process via free radical polymerisation. Its manufacture employs the same method today .
LDPE is unreactive at room temperatures.
It can withstand temperatures of 80 °C continuously and 95 °C for a short time .
Made in translucent or opaque variations, it is quite flexible, and tough to the degree of being almost unbreakable .
It has more branching than HDPE , so its intermolecular forces are weaker.
its density is lower than HDPE .
2.1.2 Physical qualities
Maximum Temperature : 176 ° F ( 80 ° C)
Minimum Temperature : −58 °F ( −50 °C )
Melting Point : 248 °F ( 120 °C )
Tensile Strength : 1700 psi ( 11.7 MPa)
Hardness : SD 55
Density : 0.92 g/cm³
Rice husk is one of the abundant natural resources in Thailand . It has been used as fuel or raw material for silica, but has not been sufficiently utilized so far . Rice husk roughly contains 35% cellulose, 35% hemicellulose, 20% lignin and 10% ash (94% silica), by dry weight basis 2.2 Rice husk
Low Density Polyethylene (LDPE)
Sieve Shaker Machine
3.2.1 Preparation low density polyethylene composites made with rice husk
1. Crush rice husk and screen to 100 mesh size
2. Dry the sieved rice husk in an oven at 80 Celcius for 5 hours.
3. Compound sifted rice husk and low density polyethylene by internal mixer