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methylene diphenyl diisocyanate manufacturing process?
Methylene diphenyl diisocyanate, often abbreviated as MDI, is known as an aromatic diisocyanate.
Are toluene diisocyanate and hexamethylene diisocyanate hazardous air pollutants or haps as per the us-epa?
Yes
Are there any isomers of toluene?
Yes. Two isomers of toluene are known as toluene-2,4-diisocyanate and toluene-2,6-diisocyanate
What is the hs code of toluene diisocyanate?
3909.50.1000
Can you use diisocyanate in swimming pools?
yes u can
What has the author Howard E Momberg written?
Howard E. Momberg has written: 'A comparison of two methods for the determination of toluene diisocyanate in air' -- subject(s): Toluene 2,4-Diisocyanate, Analysis
What is the manufacturing method of foam?
Most foam is made from polyurethane.They start by making polyurethane. To make it, you mix a polyol with a diisocyanate. There are many polyols. There are two important isocyanates, toluene diisocyanate and methylene diisocyanate. (Two other diisocyanates are used to make urethane paint.) The choice of polyol governs whether the foam is hard or soft, and how soft or hard it is.Next, you mix in a blowing agent. The first blowing agent was water, which forms CO2 in contact with diisocyanate. They don't like making insulating foam with water, because the foam doesn't insulate as well.
What is the method of manufacture?
Most foam is made from polyurethane.They start by making polyurethane. To make it, you mix a polyol with a diisocyanate. There are many polyols. There are two important isocyanates, toluene diisocyanate and methylene diisocyanate. (Two other diisocyanates are used to make urethane paint.) The choice of polyol governs whether the foam is hard or soft, and how soft or hard it is.Next, you mix in a blowing agent. The first blowing agent was water, which forms CO2 in contact with diisocyanate. They don't like making insulating foam with water, because the foam doesn't insulate as well.
What is two-component polyurethane?
All polyurethane contains two chemicals: a diol and a diisocyanate. (There's also a catalyst called DABCO and a few other items in there to modify the finished polymer, but for now let's stick with the two important ones.) A two-component polyurethane brings you the diol and the diisocyanate as two separate packages. There are a couple of two-component systems available to someone who doesn't own a plastics plant: car paint, where you put hardener in the paint to make it dry, and sprayed foam insulation. The way most of us get our polyurethane is as single-component systems, because diisocyanate is very poisonous. Polyurethane varnish, Gorilla Glue, and polyurethane construction adhesive all work the same way: the diisocyanate is missing parts. If you add water to it--whether through the air or by moistening the surface--the diisocyanate picks up what it needs and the urethane reaction commences.
How is polyurethane made?
Polyurethane chemistry is complex, but the basics are relatively easy to understand. Polyurethanes are formed by reacting a polyol with a diisocyanate or a polymeric isocyanate in the presence of suitable catalysts and additives.
What are the monomers in spandex?
Spandex polymers are composed of three different monomers. Dialcohol monomers make up the rubbery, soft part of the polymer while diamine and diisocyanate monomers make up the rigid, hard part of the polymer. The three monomers of spandex therefore are dialcohol, diamine and diisocyanate.
What does dimeryl means in dimeryl diisocyanate?
The name apparently comes from "dimer" and "-yl" as in 'alkyl' or 'aryl,' common classes of organic radical functional groups. According to specification, 'dimeryl' is a hydrocarbon with 36 carbon atoms and two radicals. In dimeryl diisocyanate (DDI), isocyanate groups are attached to both functional points of the dimeryl biradical. There is apparently no such thing as "merylic acid".
