Knowde Enhanced TDS
Identification & Functionality
- CASE Ingredients Functions
- Plastics & Elastomers Functions
- Technologies
Features & Benefits
- Labeling Claims
- CASE Ingredients Features
- Materials Features
- Key Performance Benefits
- Delayed cream with good back-end cure.
- Useful as a curative for polyurethane prepolymers and epoxy systems.
- Wide processing latitude.
- Produces elastomers with excellent physical properties, chemical resistance, and hydrolytic stability.
- Ames negative diamine curative.
- Long pot life
Applications & Uses
- Compatible Polymers & Resins
- Product Applications
VERSALINK® 740 M produces elastomers with excellent physical properties when used to cure polyether and polyester-backbone TDI prepolymers formulated with 80/20-TDI 2,4 / 2,6 isomer blend. VERSALINK® 740 M is not recommended for use with prepolymers based on pure 2,4 TDI isomers. Polyurethane elastomers formulated with VERSALINK® 740 M, while exhibiting outstanding physical properties, also have excellent chemical properties. Tests conducted on VERSALINK® 740 M-cured elastomer formulations disclose excellent hydrolytic stability, dry heat aging, high temperature performance, electrical properties and chemical resistance (including oil, solvent, weather and ozone resistance). VERSALINK® 740 M can be used in the manufacture of polyurethane elastomers intended to contact dry food.
VERSALINK® 740 M demonstrates a relatively versatile and “forgiving” capability for providing excellent, frequently superior elastomer physical property. Formulation and processing conditions can be selected and optimized for specific or general enhancement of the elastomers depending upon the requirements of the user. Whether processing VERSALINK® 740 M by the “hand batch” method or by automatic dispensing equipment, the best overall results will be obtained by using the following general processing conditions: Select an amine stoichiometry in the range of 85 % to 100 % of the reported NCO content of the prepolymer. If VERSALINK® 740 M is being evaluated in a formulation as a replacement for another diamine curative, initially evaluate the same stoichiometry before varying the ratio of curative to prepolymer. VERSALINK® 740 M, which has a melting range of 125 °C – 128 °C, should be processed at 140° C.
The melted curative is thoroughly mixed with the liquid prepolymer that has been heated to 85 °C – 90 °C. It is generally good practice to degas the prepolymer before mixing with the curative as well as after mixing. A minimum of 5 mm Hg should be maintained in the degassing chamber. The degassed mixture should then be poured into a mold that has been heated to 100 °C. The final elastomer part should then be demolded at an optimum time, which may vary between 15 min and 60 min, depending on the prepolymer used. While various post-cure conditions may be employed, our recommendation is 6 hours at 100 °C for ethers and 16 hours at 100 °C for esters.
Properties
- Physical Form
- Appearance
- Off-white powder
- Typical Properties
| Value | Units | Test Method / Conditions | |
| Amine Equivalent | 157.0 | — | — |
| Density (at 21°C) | 1.19 | g/cm³ | — |
| Melting Range | 125-128 | °C | — |
| Flash Point | 288.0 | °C | PMCC |
| Equivalent Weight | 157.0 | — | — |
Storage & Handling
- Shelf Life
- 12 months
- Storage Conditions
- Storage conditions: dry and cool place in factory-packed containers.
- Optimum storage temperature: 10 to 30 °C.