Why is the filter bag material PE a polyester, not a polyethylene
PE (Polyethylene) : Polyethylene, is the most simple structure of high polymer organic compounds, in today's world the most PE Polyethylene widely used polymer materials, composed of ethylene polymerization.
Polyester: the general name of a polymer compound that is condensed by diglycol or polyols and dibasic acid or polyacid. Include polyester resin, polyester fiber, polyester acid glue etc. Polyester, Polyethylene terephthalate (PET) belong to the high molecular compound. Consists of terephthalic acid (PTA) and ethylene glycol (EG) through polycondensation produce polyethylene terephthalate (PET), part of the PET and ultimately generated by underwater pelletizing. Purpose: fiber grade polyester chip is used to make polyester staple and polyester filament, which is the raw material for fiber and related products of polyester fiber. Polyester film and bottle, and other purposes at the same time, widely used in packaging industry, electronic appliances, medical and health care, construction, automotive and other fields, the packaging is one of the largest non polyester fiber application market, is also the fastest growth in PET. It can be said that the polyester slice is an important intermediate product that connects the petrochemicals and the products of several industries.
It is divided into high density polyethylene, medium density polyethylene and low density polyethylene according to the density. Polyethylene is a high polymer chain that is connected by a repeat - CH2 - unit connection through the addition and polymerization of ethylene (CH2 = CH2). Purpose: polyethylene insoluble in water, water is very small, is about some chemical solvents, such as toluene, acetic acid, etc., and only showing modest dissolved when temperature above 70 ℃. But polyethylene particles shape, can be between 15 ℃ and 40 ℃ melting or solidification, along with the change of temperature at higher temperatures melt, absorbing heat; When the temperature drops, it solidifies, releasing heat. Because it absorbs little water, it is not wet, it has insulation, so it is a good building material.
