Evonik TMDI 2,2,4-Trimethylhexamethylene diisocyanate 28679-16-5

Product Introduction
VESTANT TMDI is an aliphatic isocyanate containing methyl branches. It is a mixture of 2,2,4-trimethylhexamethylene diisocyanate and 2,4,4-trimethylhexamethylene diisocyanate. (about 1:1). As an aliphatic isocyanate, VESTANT TMDI is a low viscosity, colorless liquid with a slight odor.

Property Parameters

nature	Value	unit	Test method
NCOcontent	39.7-40.0	weight percentage	EN ISO 11 909 ASTM D 2572
Purity	≥99.5	weight percentage	gas phase Color spectrumYi

Typical

nature	Value	unit	Test method
Clcontent	≤ 10	ppm	—
At20 Density at °C	1.010 -1.016	g /cm3	DIN 51 757 ASTM D 2111
At23 Viscosity at °C	5 -8	mPa.s	DIN EN ISO 3219
Color (APHA)	≤ 10	—	DIN/ISO 6271
Refractive Index	1.461	—	DIN 51 423,Part2
vapor pressure@20℃	2700	hPa	—
Flashpoint (closed loop)	148	℃	DIN 51 758
Randian	440	℃	DIN 51 74

Properties and Applications Color (APHA)

≤ 10

—

DIN/ISO 6271

Refractive Index

1.461

—

DIN 51 423,Part2

vapor pressure@20℃

2700

hPa

—

Flashpoint (closed loop)

148

℃

DIN 51 758

Randian

440

℃

DIN 51 74

Properties and Applications
Based on aliphatic properties, VESTANT TMDI can be used to manufacture light and weather resistant polyurethane. Compared with cyclic aliphatic isocyanates, VESTANT TMDI endows the obtained polyurethane with very flexible chain segments. Polyurethanes made with VESTANT TMDI exhibit excellent compatibility. Naturally, many properties of polyurethane resins also depend on substances that react with TMDI, such as POLYOLS.
VESTANT TMDI can be used to prepare amino-modified resin for coating. The properties of polyurethane made from VESTANT TMDI are excellent flexibility, compatibility and low viscosity. Applications under heating conditions are as follows, polyurethane dispersions and radiation-cured polyurethane-modified acrylics. If VESTANT TMDI, which accounts for half of the total isocyanate, is added to the isocyanate system, it will cause changes related to the above-mentioned properties.

Reactivity and Catalysts
As an aliphatic isocyanate, the reactivity of VESTANT TMDI is not as good as that of aromatic isocyanate, but its reactivity is obviously higher than that of cyclic aliphatic isocyanate. If it is necessary to accelerate the reaction, just add 0.001 to 0.01% of dibutyltin dilaurate (DBTDL).

Storage and Packaging
VESTANT TMDI can be stored in closed tanks for at least one year without loss of quality.
VESTANT TMDI is packed in 25KG and 200KG jars.

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Based on aliphatic properties, VESTANT TMDI can be used to manufacture light and weather resistant polyurethane. Compared with cyclic aliphatic isocyanates, VESTANT TMDI endows the obtained polyurethane with very flexible chain segments. Polyurethanes made with VESTANT TMDI exhibit excellent compatibility. Naturally, many properties of polyurethane resins also depend on substances that react with TMDI, such as POLYOLS.
VESTANT TMDI can be used to prepare amino-modified resin for coating. The properties of polyurethane made from VESTANT TMDI are excellent flexibility, compatibility and low viscosity. Applications under heating conditions are as follows, polyurethane dispersions and radiation-cured polyurethane-modified acrylics. If VESTANT TMDI, which accounts for half of the total isocyanate, is added to the isocyanate system, it will cause changes related to the above-mentioned properties.

Reactivity and Catalysts
As an aliphatic isocyanate, the reactivity of VESTANT TMDI is not as good as that of aromatic isocyanate, but its reactivity is obviously higher than that of cyclic aliphatic isocyanate. If it is necessary to accelerate the reaction, just add 0.001 to 0.01% of dibutyltin dilaurate (DBTDL).

Storage and Packaging
VESTANT TMDI can be stored in closed tanks for at least one year without loss of quality.
VESTANT TMDI is packed in 25KG and 200KG jars.