What is LMP ?
Refined polyethylene waxes are categorized into grades based on the requirements of the end use application. Polyethylene waxes manufactured by this method should be stripped of low molecular weight fractions to yield a flash point > 500°f (> 260°c) in order to be used in a safe manner.
Properties can vary widely especially as related to flash point. The below does not reflect the level of contaminants such as water and catalyst that must be removed for safe use as a refined polyethylene wax.
If catalyst is not properly removed through refining the LMP low polymer wax can begin to degrade over time as shown by color body generation. Volatile content can be determined by placing samples in ovens at 250c while residual catalyst can be tested by ash content testing (ASTM d5630) and should be well below 0.1% to insure safety of the refined polyethylene wax.
Polymerization of ethylene to produce polyethylene wax is by either high or low pressure polymerization.
Polyethylene produced via polymerization of ethylene monomer in combination with one or more co-monomer. Polymerization can be classified into either high or low pressure polymerization with the following characteristics:
• high pressure polymerization -produces low density polyethylene (HDPE)
• low pressure polymerization. Produces high density polyethylene (LDPE)
How produce LMP ?
Low molecular polyethylene wax is produced by refining of high molecular weight polyethylene.
High molecular poly ethylene was is gained by direct polymerization of ethylene
Each production technique generates products with unique and different properties. Main specification of low molecular weight polyethylene waxes are viscosity, density and melt point.
The stream of material that is recovered from high density polyethylene resin plants is generally called LMP orlow polymer wax. Low polymer LMP wax requires the removal of corrosive and hazardous oligomers and catalyst especially when being used in FDA needed products. In addition low polymer LMP wax often contains significant quantities of water and other non-wax contaminants that must be removed. Volatile compounds in low polymer wax can cause fire and safety concerns in end use applications so all security should be mentioned during the production line.
Application of LMP
Additives of crayons and candles, high melting adhesives, master batch , traffic paints, lubricants for PVC compound stabilizers, Ant blocking agents, Pigment dispersing agents, plastic compounds , Printing inks, Crayons, Pastels, Calcium carbonate , master batches, Candles, Plastic additive , tire , rubber .
LMP is solid , in granule , prilled , flake or powder so packing can be jumbo bags , 25 kg bags , In loose or palletized .
Which item is important in LMP ?
Moisture , oil content and color are the most important elements in this product .
Better quality means snow white color , high dryness and lower oil content .
Also the melting point can be major specification , higher melting point is higher appreciated by customers .
|Specification of Low Molecular Weight PE Wax|
105 – 115 °c
175 – 190 °c
0.9 ± 0.04 KG/m3
Viscosity @ 149 °c
9.5 – 11.5
0.09 ± 0.06 mm
White Flake (Super Dry)