Dipentaerythritol

Structural formula
Structural formula of dipentaerythritol
General
Surname	Dipentaerythritol
other names	Dipentaerythritol 2,2,2 ', 2', - tetrakis (hydroxymethyl) -3,3'-oxydipropan-1-ol
Molecular formula	C 10 H 22 O 7
Brief description	white, crystalline, odorless powder
External identifiers / databases
CAS number 126-58-9 EC number 204-794-1 ECHA InfoCard 100.004.359 PubChem 31352 ChemSpider 29085 Wikidata Q27263983
properties
Molar mass	254.28 g mol −1
Physical state	firmly
density	1.36 g cm −3
Melting point	215-218 ° C
boiling point	Decomposes at 373 ° C
solubility	poorly soluble in water (2.4 g l −1 at 20 ° C)
safety instructions
GHS labeling of hazardous substances no GHS pictograms H and P phrases H: no H-phrases P: no P-phrases
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Dipentaerythritol (according to IUPAC nomenclature 2,2,2 ', 2', - tetrakis (hydroxymethyl) -3,3'-oxydipropan-1-ol) is a 7-valent alcohol . The name suggests the structure of two molecules of pentaerythritol .

Extraction and presentation

Dipentaerythritol can be produced on an industrial scale by reacting acetaldehyde with an excess of formaldehyde in the presence of sodium hydroxide . The basic reaction path thus corresponds to that in the manufacture of pentaerythritol, but differs in the stoichiometric ratios used.

properties

Physical Properties

Dipentaerythritol is a white, crystalline and odorless powder.

Chemical properties

The hydroxyl groups essentially enter into the reactions typical of alcohols, such as esterification with acids .

use

Dipentaerythritol is used, among other things, for the production of paint binders . For radically polymerizable coatings (UV-lacquers) may be an esterification with acrylic acid are performed. The product dipentaerythritol hexacrylate is obtained . Furthermore, by esterification with fatty acids, so-called alkyd resins are obtained , which contain particularly high proportions of fatty acids (> 80m-%).

Individual evidence

1. ↑ ^{a b c d e f g} Entry for CAS no. 126-58-9 in the GESTIS substance database of the IFA , accessed on May 27, 2019(JavaScript required) .
2. ↑ Max Oscar Robeson, Tex Clarkwood: DE1158950A: Process for the production of mixtures of pentaerythritol and dipentaerythritol . December 12, 1963.
3. ↑ Roland Baumstark, Manfred Schwarz, Reinhold Schwalm, Ulrich Poth: Acrylate resins . Vincentz Network, Hannover 2014, ISBN 978-3-86630-820-6 , p. 286, 302 .
4. ↑ Poth, Ulrich: Synthetic binders for coating systems . Vincentz Network, Hannover 2016, ISBN 978-3-86630-611-0 , p. 119 .