In industry there are different types of polyethylenes with varying ranges of crystallinity and density. The density of polyolefins is the lowest among all polymers and is divided into three ranges for polyethylene: the low density region from 0.91 to 0.925 g, the light polyethylene region (LDPE), the medium density region (MDPE) from 0.926 Up to 0.94 g / cm3 and the density range from 0.94 to 0.965 g / cm3 which is labeled as heavy polyethylene (HDPE). Low Density Polyethylene (LDPE) is widely used for manufacturing various goods like plastic bags, film, containers, toys, plastic parts, home appliances, flexible injection parts and etc.
LDPE polymerization is done by free radical method, at high pressure of 122-303 MPa and at temperature of 130-135 ° C. The polymerization time is very short and takes 15 seconds to 20 minutes, depending on the type of reactor used. The usual method of making it creates branches and produces chains with long and short branches. Side chains prevent crystallization. Due to this, the percentage of crystallinity in LDPE is low. Its density is between 0.915-0.930 g / cm3 and the crystallinity percentage is about 40 to 50%. Long branches on LDPE molecules are expected to modify its flow properties. The presence of these branches widens the molecular weight distribution.
The presence of these branches determines the degree of crystallinity and the transfer temperature, and affects the crystallographic parameters such as the size of the single cells, the adjustment angle, and the size of the crystals. The short branches in LDPE are mostly normal butyl, but ethyl and possibly butyl and hexyl are formed to a lesser extent by radical attack from the back (biting). Long strands of tens or hundreds of carbon atoms in the structure of these polymers are formed by intermolecular chain transfer. LDPE has good branching structure, high melt strength and lower viscosity due to its branching structure, which makes it suitable for blowing film production. In fact, more than half of the consumption of lightweight polyethylene is allocated to this process.
LDPE Products
The designed production capacity of LDPE plant is 300000 ton/year. List of all 9 grades of LDPE products is as below .
Sales parts | MFI (2.16 kg) (dg/min) | Density(kg/m3) | Application | More Info |
LFI2130 | 0.3 | 921 | Film | |
LFI2119 | 1.9 | 921 | Film | |
LFI2125A | 2.50 | 921 | Film | |
LFI2185A | 0.85 | 921 | Film | |
LFI2185 | 0.85 | 921 | Film | |
LFI2575 | 0.75 | 925 | Film | |
LFI2047A | 4.7 | 920 | Film | |
LFI2447A | 4.7 | 924 | Film | |
LIM1922 | 22 | 919 | Injection Molding |
Panorama Global Trade Sdn Bhd will provide Low Density Poly Ethylene with competitive price in global market . For storing this product our clients may keep LDPE in a cool, dark, well-ventilated place for transport and storage. Also away from sunlight and heat.