Effective Polyurethane Elastomer Curing Crosslinking Agent Suitable for Low Temperature CAS NO.106264-79-3 Ethacure 300

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Effective polyurethane elastomer curing crosslinking agent Suitable for low temperature CAS

NO.106264-79-3 ethacure 300


1.Product introduction of the Effective polyurethane elastomer chain expansion agent DMTDA

DMTDA is a new polyurethane elastomer curing crosslinking agent, which is equivalent to Ethancure 300 mainly 2,6-dimethylthiotoluenediamine mixture of two isomers i.e., 2,4- and (ratio of about 77 ~ 80/17 ~ 20), compared with the commonly used MOCA, lower viscosity at room temperature is liquid, can be applied to the construction operation, and low chemical equivalents used at a low temperature. 


2.Properties of the Ethacure 300:

Texture: light yellow clear liquid with a slight ammonia odor

Chinese name: dimethyl thiotoluene diamine or 2,4-diamino-3,5-dimethyl thio toluene (DMTDA)

Alias: Ethacure 300, E-300

Formula: C9H14N2S2 

MW: 214.36

CAS No: 106264-79-3

Boiling point (1.68mmHg): 200 (353 dec)

Density (20 ?) g / ml 1.206

Viscosity, Cps at 68 ? (20 ?) 900

Amine value, mg KOH / g 536

Dimethylthiotoluenediamine (2,4-plus 2,6) content% =95

A methylthio diaminotoluene% =4.0

Three sulfur content% =1.0 toluene diamine

Moisture =0.1%

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3.Quality indicators of the Substitute of MOCA:

Property

Result

Appearance

Light yellow liquid

Dimethylthiotoluenediamine

= 95% (Q/370781YXHG002-2015)

Methylthiotoluenediamine

= 4.0%

Trimethylthiotoluenediamine

= 1.0%

Water content

= 0.1%

Amine value (mg KOH/g)

525-535


4.Usage of the curing agent Suitable for low temperature:

DMTDA environmental toxicity is a type of liquid diamine chain extender, mainly used for polyurethane elastomers, RIM (reaction injection molding), SPUA (spray polyurea elastomer) and adhesives; also used as 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 speed much slower than DETDA, may be mixed in different proportions with DETDA used to adjust the curing speed to meet different needs.

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5.Packing:

25kg / drum or 200kg / drum, need nitrogen sealed, as one can not run a package, after use, should be subject to nitrogen sealed deposit. Avoid outdoor exposure or long-term placement under high temperature conditions. This product is in storage, preferably above 0 ?, can ensure long-term quality of the same. Product during storage and exposure to air, the product will gradually become darker in color is a normal phenomenon.

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6.Related operations of the DMTDA CAS NO. 106264-79-3: 

DMTDA CAS NO.106264-79-3, because at room temperature liquid, so the operator has significant benefits, such as the transfer easier and MOCA solid melting process will be eliminated. Similarly, the possibility of clotting does not occur in a mixing vessel or mixing machines inside. Further, it is in a liquid state, allowing to operate at a lower temperature than MOCA. DMTDA equivalent weight 107 is 133.5 compared with MOCA, which means that at the same given prepolymer stoichiometry can be reduced under 20% by weight of the amount of use. 

For example:

Prepolymer (NCO 4.1) 100 parts 100 parts

MOCA (95% of theory) 12.4 parts -

DMTDA (95% of theory) - 9.9 parts

Total 112.4 109.9 parts parts

DMTDA specific gravity of about 1.20g / cm3, recommend the use of temperature 70-90 ? (21-33 ?), and the use of temperature 240 ? (116 ?) melted MOCA proportion of 1.26g / cm3, which means that the volume of use Both such feedstocks delivery pump, without changing the existing mixing devices, the need to achieve the above object of the use ratio of MOCA to DMTDA use ratio.

Physical properties of the curing agent DMTDA cured polyurethane elastomer: physical properties of the prepolymer, including polyester and polyether type, cured with DMTDA, and comparison with MOCA curable phase; using MOCA as a curing system, pre- Physical properties of the cured polymer ideal ratio is sensitive, DMTDA curing agent compared with MOCA, to stoichiometric exhibit acceptable deviation. low stoichiometry (80-90%) is usually obtained as helpful maximum permanent deformation resistance to compression rate, and high stoichiometric (100-105%) helps to get the maximum value such as tear strength and fatigue life. For best results when using at most 95% of the ideal ratio. (DMTDA curing conditions (temperature and time) and MOCA similar, but need to be more DMTDA secondary vulcanization conditions to obtain the optimum physical properties, particularly compression set and dynamic mechanical properties.

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