1、Physical Properties

English name: Polyurethane Elastomer Curing Chain Crosslinking Agent,DMTDA,E300,Ethacure 300
English alias: 4,6(or 2,6)-Bis(methylthio)-2(or 4)-methyl-1,3-benzenediamine;1,3-Benzenediamine, 4,6(or 2,6)-bis( Methylthio)-2(or 4)-methyl-
Chinese Name:二甲硫基甲苯二胺,固化劑DMTDA,擴鏈劑DMTDA

Chinese alias: 2,4-diamino-3,5-dimethylthiotoluene
CAS NO: 106264-79-3
EINECS number: 403-240-8
Molecular formula: C9H14N2S2
Molecular weight: 214.34
Boiling point: 200°C (1.68 mmHg)
Refractive rate: 1.659
Flash point: 163.4 °
Density: 1.206

?2. Physical Properties And Quality Indexes Of Polyurethane Elastomer Curing Chain Crosslinking Agent,DMTDA,E300

3. Use Of Polyurethane Elastomer Curing Chain Crosslinking Agent,DMTDA,E300

A New Type Of Polyurethane Elastomer Curing Cross-Linking Agent, In Which There Are Mainly Two Isomers, Namely A Mixture Of 2,4- And 2,6-Dimethylthiotoluenediamine (The Ratio Is Approximately 77~80/17~20. ), Compared With The Commonly Used MOCA, At Room Temperature Is A Low Viscosity Liquid, Can Be Applied To Low Temperature Construction Operations, Chemical Use Of Low Equivalents.

4. Dimethyl Thio-Toluene Diamine,DMTDA,CAS NO:106264-79-3

.Packing:
250kg/Iron Drum, Need To Be Sealed With Nitrogen Gas, If One Can'T Use Up One Package, After Use, It Needs To Be Sealed With Nitrogen Again. Avoid Outdoor Exposure or Long-Term Placement In Hot Conditions. When This Product Is Stored, It Is Better To Be Above 0°C, Which Can Guarantee Long-Term Quality. It Is A Normal Phenomenon That The Product Color Will Gradually Darken When The Product Is Stored And Exposed To The Air.

Shipping Port: Shanghai Port
Price Quote Validity: 15 Days
Entry Time: 15 Days (Commodity Inspection Declaration)
Export Authority: The Company Owns Import And Export Rights.

5, Polyurethane Elastomer Curing Chain Crosslinking Agent,DMTDA,E300  Product Advantages
Dimethylthiotoluenediamine-DMTDA Is A New Type Of Polyurethane Elastomer Curing Cross-Linker, Equivalent To Ethancure 300 In Which There Are Two Main Isomers Namely 2,4- And 2,6-Dimethylthiotoluene II. The Amine Mixture (Ratio Of Approximately 77 To 80/17 To 20) Is A Liquid With A Lower Viscosity At Room Temperature Compared To The Commonly Used MOCA, And Can Be Applied To Low-Temperature Construction Operations With A Low Chemical Equivalent. DMTDA Is An Environmentally Friendly And Low-Toxic Liquid Diamine Chain Extender, Mainly Used For Polyurethane Elastomers, RIM (Reaction Injection Molding), SPUA (Sprayed Polyurea Elastomer) And Adhesive; Also Can Be Used As Epoxy Resin. Curing Agents Are Now Widely Used In Polyurethane Rubber Rollers, Medicine, Stamping, Etc. In Addition, It Has A Wide Range Of Applications In The Automotive, Construction, Coal, Metal ore, Textile, Paper, And Printing Industries. The Curing Speed Of DMTDA Is Much Slower Than DETDA And Can Be Mixed With DETDA In Different Proportions To Adjust The Curing Speed To Meet Different Requirements.

1. The Steric Hindrance Of Dimethylthiotoluenediamine-DMTDA Sterically Hindered Aromatic Diamine, Methylthio And Methyl Groups Makes Its Activity Lower Than That Of TDA And DETDA, And Its Reaction Rate With The Prepolymer Is Longer Than That Of DETDA. -9 Times.

2. The Activity Of Dimethylthiotoluenediamine-DMTDA Is Higher Than That Of MOCA. In The Prepolymer With Low NOC Content, The Casting Time Using Dimethylthiotoluene Diamine-DMTDA Is Shorter Than That Of MOCA, And It Is Improved For The Production Operation Of Workers. More Suitable For Production Efficiency.

3. Curing Temperature Can Be Reduced To Room Temperature (Preheat Temperature Can Be Adjusted In The Range Of 25 Degrees To 100 Degrees)

4. The Equivalent Low Is 107 (MOCA Is 133.5), And The Consumption Of Curing Prepolymer Is Low And The Cost Is Reduced.

5. The Synthetic PU (Polyurethane) Properties And Alkali Resistance Are Better Than Those Of MOCA Cured Products, And Injection-Type Elastomers Are More Effective.

6. When MOCA Cures, High Temperature Will Volatilize Out Carcinogens, While DMTDA Will Not Volatilize Carcinogens When Used At Room Temperature. It Is Internationally Recognized As An Environmentally Friendly Chain Extender (Curing Agent).

7.Compared With Traditional Curing Agent MOCA, Dimethylthiotoluene Diamine-DMTDA Has Many Advantages: It Is Liquid At Room Temperature, Easy To Use, Can Be Cured At Room Temperature; The Mechanical Properties Of Cured Products Can Be Compared With That Of MOCA Compared With Similar Foreign Products. The Physical And Mechanical Properties Are Basically The Same, The Price Is Lower, And The Product Cost Can Be Reduced. Therefore, This Product Is An Ideal Substitute For Traditional Curing Agents.

6. Application Of Diethyltoluenediamine (DETDA) And Dimethylthiotoluenediamine (DMTDA)

Commonly Used Are Two Liquid Amine Chain Extenders: Diethyltoluene Diamine (Detda, Commercial Brand Ethacurel00), Dimethylthiotoluenediamine (DMTDA, Trade Name Is Ethacure300). Liquid Amine Chain Extender DMTDA And The Speed Of The Prepolymer Reaction Is Lower Than That Of The Liquid Amine Chain Extender Detda. When Used Together With Detda, The Prepolymer Can Give Good Surface Leveling Properties To The Elastomer And Has Little Effect On The Mechanical Properties. However, Due To The Presence Of Methylthio Groups In Its Molecule ( -SCH3), So It Is Easy To Discolor And Yellow In Outdoor Use And Cannot Be Used In Applications Where High Color Retention Is Required.

A Hindered Secondary Amine Chain Extender Such As N,N'-Dialkylmethyldiamine Can Be Used. Its Structural Formula Contains One Unstable H And One Alkyl Group, And The Alkyl Group Is Equivalent To An Internal Plasticizer In The Molecule. Compared With Other Aromatic Amine Chain Extenders, The Reaction Speed Of N,N'-Dialkylmethyldiamine And Isocyanate Is Slow And A Good Surface State Can Be Obtained. Mixing With Detda Can Adjust The Gel Time And Increase The Adhesion And Surface Condition.

7, Polyurethane Elastomer Curing Chain Crosslinking Agent,DMTDA,E300 Processing Performance And Performance:
 
Dimethylthiotoluenediamine-DMTDA Is A Low-Viscosity Liquid At Room Temperature, It Has Good Fluidity, And Therefore, It Provides Flexibility For The Temperature Of The Prepolymer And The Curing Agent To Be Blended, And Accordingly There Are Also The Following Advantages:
 
1. Good Compatibility With Other Components;
 
2. When The Content Of NCO% In The Prepolymer Is Low, The Curing Time It Requires Is Shorter Than That Of MOCA, Which Is More Advantageous To The Operator.
 
3. When The Content Of NCO% In The Prepolymer Is High, It Needs To Be Cured For A Long Time Due To Its High Reactivity, Which Is Especially Advantageous To The Operator.
 
4. The Equivalent Value Of DMTDA (107) Is Smaller Than That Of MOCA (133.5) At The Same NCO% Content. Therefore, It Is Used In A Smaller Amount Than MOCA.

8、Polyurethane Elastomer Curing Chain Crosslinking Agent,DMTDA,E300 Foreign Products ETHACUR E300, MOCA

1. The Polyurethane Elastomer Curing Chain Crosslinking Agent,DMTDA,E300 Product Has A Room Temperature Viscosity Greater Than That Of EthaCU RE300. It Is Known That In The Production Of Polyurethane Elastomers, Both The Prepolymerization Method And The Semi-Prepolymerization Method, The Prepolymer Components Have Higher Viscosities, And When The Two Components Are Mixed, The Viscosity Is Similar, And The Mixing Is Easier; And When Mixing, Both Components Must Be Kept Warm. Even At Room Temperature Mixed Curing, The Viscosity Of The Product Will Not Have Any Effect On The Process, So The Relatively Large Viscosity Has No Effect On Its Application.

2, The Appearance Of Color Deeper Than ETHACURE300. This Is The Inadequacy Of The Product, And The Application Of This Product In Polyurethane Light-Colored Products Is Very Limited. In This Regard, Further Improvements Are Needed.

3, The Performance Of The Elastomer Obtained By The Product Can Be Compared With That Of MOCA Completely, And There Is Still Some Improvement In Certain Properties; In This Respect, It Has Also Completely Reached The Level Of Similar Foreign Products.