1. Product physical properties

Chinese name dimethylthiotoluene diamine, curing agent chain extender DMTDA
English name: Dimethyl Thio-Toluene Diamine
Appearance: yellow to amber transparent liquid at room temperature
Content:》 99%
Water content: ≤0.1%
Density: 1.206 (20 ℃)
Boiling point: 200 ℃ (1.68mmHg)
Viscosity: 600-900 mPa · s (25 ℃)
Vapor pressure (mmHg) max 0.01 (20 ℃)

Packing: Net weight 200KG / galvanized iron barrel (16 tons in a small cabinet), 1000KG / IB barrel (18 tons in a small cabinet) or 23 tons of ISOTANK.

2. Product Technical Index

3. Product use and product advantages

A new type of polyurethane elastomer curing crosslinking agent, in which there are mainly two isomers, a mixture of 2,4- and 2,6-dimethylthiotoluenediamine (ratio is about 77 ~ 80/17 ~ 20 ), Compared with the commonly used MOCA, it is a liquid with a low viscosity at normal temperature, which can be applied to the construction operation at low temperature, and has the advantages of low chemical equivalent.
Dimethylthiotoluene diamine-curing agent chain extender DMTDA is a new type of polyurethane elastomer curing crosslinking agent, which is equivalent to Ethancure 300. There are two main isomers, namely 2,4- and 2,6- A mixture of methylthiotoluene diamine (ratio about 77 ~ 80/17 ~ 20), compared with the commonly used MOCA, it is a low viscosity liquid at room temperature, which can be suitable for operation at low temperature, low chemical equivalent, etc. advantage. DMTDA is an environmentally friendly, low-toxic liquid diamine chain extender, mainly used in polyurethane elastomers, RIM (reactive injection molding), SPUA (sprayed polyurea elastomer) and adhesives; it can also be used for epoxy resin curing The agent has been widely used in polyurethane rubber rollers, medicine, stamping and forming.In addition, it has been widely used in automobiles, metal mines, textiles, papermaking, and printing industries.

The curing agent chain extender DMTDA curing speed is much slower than DETDA, and can be mixed with DETDA in different proportions to adjust the curing speed to meet different needs.
1. Dimethylthiotoluenediamine-DMTDA hindered aromatic diamine, the steric hindrance of methylthio and methyl makes its activity lower than TDA and DETDA, and its reaction rate with prepolymer is longer than DETDA5 -9 times.
2. The activity of dimethylthiotoluene diamine-curing agent chain extender DMTDA is higher than that of MOCA, and the pouring time for curing with dimethylthiotoluene diamine-curing agent chain extender DMTDA in the prepolymer with low NOC content Shorter than MOCA, it is more suitable for workers to operate and improve production efficiency.
3. The curing temperature can be reduced to room temperature (the preheating temperature can be adjusted within the range of 25 degrees to 100 degrees)
4. The low equivalent weight is 107 (MOCA is 133.5), and the consumption of the same amount of cured prepolymer is low to reduce the cost.
5. The performance and alkali resistance of the synthetic PU (polyurethane) is better than that of MOCA cured products, and the injection type elastomer has a better effect.
6. MOCA needs high temperature during curing to volatilize carcinogens, but DMTDA will not volatilize carcinogens at room temperature. It is an internationally recognized environmentally friendly chain extender (curing agent).
7.Compared with the traditional curing agent MOCA, dimethylthiotoluene diamine-DMTDA has many advantages: it is liquid at room temperature, easy to use, and can be cured at room temperature; the mechanical properties of the cured product are comparable to MOCA and comparable foreign products The physical and mechanical properties are basically the same, and the price is lower, which can reduce the cost of the product, so this product is an ideal substitute for traditional curing agents.

4.Dimethylthiotoluene diamine-curing agent chain extender DMTDA processing performance and performance:

Dimethylthiotoluenediamine-DMTDA is a low-viscosity liquid at room temperature. It has good fluidity. Therefore, it provides flexibility for the temperature at which the prepolymer is mixed with the curing agent. According to this, it There are also the following advantages:
1. Good compatibility with other components;
2. When the NCO% content in the prepolymer is low, it requires a shorter curing time than MOCA, which is more beneficial to the operator.
3. When the NCO% content in the prepolymer is large, it needs to be cured due to the high reactivity, which takes a long time, which is especially beneficial to the operator.
4. At the same NCO% content, the equivalent value of DMTDA (107) is smaller than that of MOCA (133.5), therefore, its dosage is less than MOCA.

5.The difference between the curing agent chain extender DMTDA dimethylthiotoluene diamine, foreign products ETHACUR E300, MOCA:

1. The resulting dimethylthiotoluene diamine-curing agent chain extender DMTDA product has a higher viscosity at room temperature than ETHACU RE300. It is known that when manufacturing polyurethane elastomers, whether it is a pre-polymerization method or a semi-pre-polymerization method, pre-polymerization The components of the substance have a high viscosity. When the two components are mixed, the viscosity is easier to mix evenly; and generally the two components must be insulated. Even if they are mixed and cured at room temperature, the viscosity of the product will not have any effect on the process. Impact, so a relatively high viscosity has no effect on its application.
2. The appearance is darker than ETHACURE300. This is the shortcoming of this product, which limits the application of this product in polyurethane cool light-colored products. In this regard, further improvement is needed.
3. The performance of the elastomer obtained by the product is completely comparable to that of MOCA, and some properties have been improved; in this respect, it has completely reached the level of similar foreign products.

Essential information for product export:

Chinese name dimethylthiotoluene diamine, curing agent chain extender DMTDA
English name: Dimethyl Thio-Toluene Diamine
Appearance: yellow to amber transparent liquid at room temperature
Tax refund: 17%
UN: 3082
CAS No.:106264-79-3
Customs Code HS: 29309090.90
Several types of dangerous goods: 9 types of dangerous goods exported
DMTDA raw materials: toluene diamine (TDA) and dimethyl disulfide (DMDS)
Packing: Net weight 200KG / galvanized iron barrel (16 tons in a small cabinet), 1000KG / IB barrel (18 tons in a small cabinet) or 23 tons of ISOTANK.