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industrial resins and the environment - polyethylene terephthalate

by:Cailong     2019-07-28
industrial resins and the environment  -  polyethylene terephthalate
What is resin?
Know what resin (
Or plastic, choose a term)
Yes, it is helpful to know that they are not just one thing.
"One way to think about resin is to think about metals," Kingsbury said . ".
They are lead, gold, aluminum, iron.
They all belong to the category of metal, but they have different properties.
They have different mining methods and different cost structures.
Plastic is the same.
"Translated into the world of resin, which means that there are many different types under umbrella terms of plastic, including polybendiester (PET)--
One of the most common, often used in water bottles-
And high density polyethylene (HDPE)
Including milk bottles.
The real question, of course, is not "what is the resin product?
"This is" where are they not?
"As mentioned, there are resin on all kinds of packaging and aircraft.
But this is just the beginning.
A large number of resins have been used in many different products, and here are a few examples: polyurethane resin is used to make furniture foam and footwear;
Acrylic resin is used in paint;
Formaldehyde Resin for wood glue [
Source: ololin].
Although it is important to know that there are a variety of resins, it is possible to make some broad generalization of how they are produced.
In most cases, the resin comes from natural gas and oil. -
Treat natural gas and oil as raw materials or building blocks for most plastics (
Despite some exceptions, you will learn about them on the last page of this article).
To go further, at the basic molecular level, the resin is just a link to the monomer extracted from oil and natural gas.
So when you hear the term polymer is used alternately with resin or plastic, this is because it may be a more precise description of the final product used in the process of producing resin: the polymer consists of many monomer.
An example might help.
Polyethylene is the most common plastic in the world, consisting of many monomer called ethylene.
In order to get polyethylene, a process occurs that breaks the double carbon bond in the ethylene gas and connects it to another ethylene [
Source: multiple films].
When you string enough ethylene monomer together, not only do you have polyethylene, but you actually have solids that can form a container like a bottle.
However, it would be better to consider it as Bill Carroll described it.
Carol, the chairman of the US chemical commission, said it would be better to imagine a single unit as a small one.
A few inches of yarn
If there are a few piles in front of you, it is easy to separate them one by one.
But if you have a bunch of longer yarns that are all wrapped together and intertwined, it would be much more difficult to separate them.
In other words, the confusion of the yarn is equivalent to resin, plastic, or polymer.
"That's how you should understand where the strength of the polymer and plastic comes from," Carol said . ".
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