Home |  News | Events| Discuss | jobs and appointment | e-Library | Contact us |

Navigation

Sponsored Links

Neopentylglycol

(Click here for a model of a molecule of Neopentylglycol )

News about Neopentylglycol



Neopentylglycol (NPG)

Neopentylglycol (NPG) is a unique polyalcohol offering superior performance advantages in many end-use applications due to its high chemical and thermal stability.
Neopentylglycol (2, 2-dimethyl-1, 3-propanediol) is a unique diol offering superior performance advantages in many end-use applications. These advantages are derived from its chemical structure. The location of the hydroxyl groups on primary carbon atoms allows rapid esterification. Additionally, the two methyl groups, instead of the usual two hydrogen atoms, on the alpha carbon atom are responsible for the high chemical and thermal stability of Neopentylglycol and it derivatives.

Application
Neopentylglycol (NPG), or 2, 2-dimethyl-1, 3-propanediol,is mainly used as a building block in polyester resins for coatings, unsaturated polyesters, lubricants and plasticizers.

Like alkyd coatings, powder coatings are characterized by superior hydrolysis resistance, good weatherability and good hardness/flexibility balance. In powder coating formulations, Neopentylglycol offers the additional advantage of providing small differences between the glass transition temperature and melting point. Important areas of application include general metal, appliance, metal furniture, automotive and machinery coatings.

Any of a class of organic chemicals characterized by having separate two hydroxyl (-OH) groups, contribute to high water solubility, hygroscopicity and reactivity with many organic compounds, on usually linear and aliphatic carbon chain. The general formula is CnH2n(OH)2 or (CH2)n(OH)2. The broadened names include diols, dihydric alcohols, and dihydroxy alcohols. Ethylene glycol, HOCH2CH2OH, is the simplest member of the glycol family. Mono-, di- and triethylene glycols are the first three members of a homologous series of dihydroxy alcohols. Propylene glycol prepared by hydrolysis of propylene oxide and widely used as an ingredient of antifreeze and humectant in cosmetics is 1,2-propanediol indicating the two hydroxyl group position at 1,2, while trimethylene glycol is 1,3-propanediol with two hydroxyl group on the primary carbon atoms.
Neopentylglycol (called structurally 2,2-dimethyl-1,3-propanediol or dimethyltrimethylene glycol) is a diol which features unique chemical structure. It has 1,3-position two hydroxyl groups on the primary carbon atom for rapid esterification reaction and two methyl groups, instead of the usual hydrogen atoms, on the alpha-carbon atom for the high chemical and thermal stability. It is a white crystalline solid; partially soluble in water; soluble in oxygenated solvents and completely soluble in alcohol. Neopentylglycol and its derivatives have the applications in the fields including water based coatings, magnetic coatings, gel coats, powder coatings, high solid systems, coil coatings, multilayer coatings (on alkyds, epoxy, polyester and poly urethane resins). It is also used as an intermediate for the synthesis of lubricants, plasticizers, adhesives, mortar or cement systems, photographic materials, pharmaceuticals, pesticides, fragrances, fibre lubricants antistatic agents, fabric softeners, vibration dampeners. Ne(o)- is the prefix added to the name of a related older compound to denote a new or recent compound, typically more branched chains in the normal structure.


Physical and Chemical Properties
PHYSICAL STATE White Flake and Molten form at 150 C
MELTING POINT 124 C
BOILING POINT 210 C
SPECIFIC GRAVITY 1.06

SOLUBILITY IN WATER Soluble. (Soluble in methanol, aceton)

pH
VAPOR PRESSURE
REFRACTIVE INDEX


NFPA RATINGS
Health: 1; Flammability: 1; Reactivity: 0
AUTOIGNITION
375 C

FLASH POINT 107 C

STABILITY Stable under ordinary conditions. Moisture sensitive

Neopentylglycol (NPG) comes as is molten bulk material 100%, as 90% solution and as flakes

OTHER INFORMATION
Hazard Symbols: XI, Risk Phrases: 41, Safety Phrases: 22-24-26




Related pages
Epichlorohydrin  Terephthalic acid  Titanium dioxide Neopentylglycol (NPG) Trimellitic anhydride Isophthalic Acid (PIA)  bisphenol A BPA
External links 
Eastman

Article/information contributed by.............. Let's Finish it Team