Chemicals Stocks

Crosslinking Agent Dimethylthiotoluenediamine 1.206 Density Environmentally Friendly
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DMTDA?is a new polyurethane elastomer cured crosslinking agent, which is equivalent to Ethancure 300 mainly 2,6-thio-toluenediamine mixture of two isomers i.e., 2,4- and (ratio of about 77 ~ 80/17 ~ 20), compared with MOCA commonly used at room temperature is low viscosity liquid, it can be applied to construction operations, chemical use and low equivalent at low temperatures. DMTDA is an environmentally friendly low-toxicity liquid type diamine chain extenders, mainly used for polyurethane elastomers, RIM (reaction injection molding), SPUA (spray polyurea elastomer) and adhesives; also be used as an epoxy resin curing agent, has been widely used in polyurethane rubber roller, medical, stamping, etc. in addition, it is in the automotive, construction, mining, metal mining, textiles, paper, printing industry has a wide range of applications. DMTDA curing rate is much slower than DETDA, with DETDA mixed in different proportions to regulate the curing speed to meet different needs. Dimethyl Thio-Toluene Diamine(DMTDA) Physical And Chemical Properties
Appearance: Light Yellow Transparent Liquid
Boiling Point: 200 ℃ (1.68 MmHg)
Refractive Index: 1.659
Flash Point: 163.4 ° C
Density: 1.206
Water≤0.1%
Amine Value (MgKOH / G) 525-535
Color Value (Platinum-Cobalt-Method) ≤500
Dimethylthiotoluenediamine (2,4-Plus 2,6) Content% ≥96.0 ?
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DMTDA (E300) |
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Properties Chemical Name: Dimethylthiotoluenediamine
Trade name: DMTDA (E300)
CAS: 106264-79-3
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Equivalent Weight………………………………………………………….107
Appearance at Room Temperature………………………..…Amber Liquid
Odor………………………………………………………………………Slight Amine
Boiling Point,℉(℃),……………………………………………667(353)(decomposes)

Density(g/cc)@68℉(20℃)……………………………………………………..1.21

140℉(60℃)……………………………………………………..1.18

212℉(100℃)………………………………………..……….….1.15

Viscosity,Cps @68℉(20℃)………………………………………………….….690

140℉(60℃)………………………………………………………22

212℉(100℃)……………………………………………………..5

Vapor Pressure, mm@65℉(20℃)………………………………………………0.6

Amine Number, mg·KOH/g………………………………………………………536

TDA content %, by weight…………………………………………………… .≤1.0%

Moisture…………………………………………………………………………≤0.1%
? PROCESSING
DMTDA ( E300) is liquid at room temperature results in significant processing advantages, for example, in such operation as transfer, melting down of solids is eliminated. Also, the possibility of freezing-up is no longer a concern during mixing or in meter-mixing machines. Additionally, its liquid state permits processing prepolymer at lower temperatures than that of MOCA.

DMTDA ( E300) has an equivalent weight of 107 compared to 133.5 of MOCA. This means that about 20℅ less by weight is required for a given prepolymer at the same stoichiometry.

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EXAMPLE

Prepolymer (%NCO 4.1)………………………………………100Pts. 100Pts.

MOCA@95%Theory……………………………………………12.4Pts. —

DMTDA ( E300) @ 95%Theory……………………………… — 9.9 Pts.

For ? ?mula Weight………………………..………………………112.4Pts. 109.9Pts.

The specific gravity of DMTDA ( E300) is about 1.20g/cc at recommended use temperatures of 70-90℉(21-33℃),whereas the specific gravity of molten MOCA at its use temperature of 240℉(116℃)is 1.26. This means that weight delivery by volumetric pumps is comparable for the two materials and therefore if no alterations for meter-mixing machines, we must change the formula weight of MOCA into that of DMTDA ( E300).

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PHYSICAL PROPERTIES OF PREPOLYMER CURED WITH DMTDA ( E300) CURATIVE
The physical properties of prepolymer, both ether and ester types, when cured with DMTDA ( E300) curative, are comparable to those obtained with MOCA. As in MOCA-curing systems, physical properties are sensitive to the ration (stoichiometry) of curative to prepolymer. DMTDA ( E300) curative exhibits tolerance to stoichiometry variations similar to that of MOCA.

Low stoichiometry (80-90%) generally tends to maximize properties such as compression set resistance, while high stoichiometry (100-105%)tends to maximize properties such as tear strength and flex life. The best results for most applications are obtained at about 95% stoichiometry. While cure conditions (temperature and times) are similar to those used with MOCA, DMTDA ( E300) curative requires somewhat closer attention to post-cure conditions to obtain maximum physical properties, particularly with respect to compression set and dynamic properties. Use the recommended schedules listed.
PACKAGE
200kg per iron drum