Polypropylene glycol

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Structural formula
Structural formula of polypropylene glycol
General
Surname Polypropylene glycol
other names
  • PPG
  • Polypropylene oxide
CAS number 25322-69-4
Monomer Propylene glycol
Molecular formula of the repeating unit C 3 H 6 O
Molar mass of the repeating unit 58.08 g mol −1
PubChem 32881
properties
density

1.002-1.007 g · cm −3

solubility

Low molecular weight polypropylene glycols are water soluble, higher molecular weight ones are hardly water soluble

safety instructions
GHS labeling of hazardous substances
no GHS pictograms
H and P phrases H: no H-phrases
P: no P-phrases
Toxicological data
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Polypropylene glycols ( PPG ) are liquid polyglycols with a high viscosity . The associated monomer is propylene glycol , nowadays mostly called 1,2-propanediol .

The short-chain representatives of this group of substances are dipropylene glycol , tripropylene glycol and tetrapropylene glycol .

Presentation and extraction

The polypropylene glycols are produced by a ring-opening polymerization of propylene oxide . It can also be synthesized by polycondensation of 1,2-propanediol .

properties

The flash point is 150-225 ° C .

use

Polypropylene glycols are used in non-ionic detergents and cleaning agents , synthetic resins , antifreeze agents and flotation agents . Polypropylene glycols are also used as anti-foam agents , plasticizers and lubricants . They serve u. a. for the production of polyurethanes , e.g. B. in two-component adhesives, where they can be mixed with the polyol component (resin component). A wide range of emulsifiers with the designation "PPG -..." are produced from them by etherification with fatty alcohols or esterification with fatty acids .

Individual evidence

  1. ↑ CAS Common Chemistry: Poly [oxy (methyl-1,2-ethanediyl)], α-hydro-ω-hydroxy- , accessed on July 30, 2017.
  2. ↑ a b c d e f g h Entry on polypropylene glycols in the GESTIS substance database of the IFA , accessed on July 30, 2017(JavaScript required) .
  3. ↑ a b c d e Entry on polypropylene glycols. In: Römpp Online . Georg Thieme Verlag, accessed on June 14, 2014.
  4. ↑ Sika, safety data sheet, Sikafloor-Comfort Adhesive Comp. A.
  5. ↑ commercially available emulsifiers