HARTCURE M (MOCA)
| Common Name: | MOCA |
| Similar Name: | 4,4'-Methylene bis (2-chloroaniline) |
| Molecular Formula: | C13H12Cl2N2 |
| CAS Number: | 101-14-4 |
HARTCURE M, commonly known as MOCA, MOCA is an amine curing agent and chain extender widely used in polyurethane (PU) products, particularly suitable for casting PU elastomers. HARTCURE M (MOCA) exhibits excellent color stability at high temperatures, and the polyurethane elastomers made from HARTCURE M (MOCA) can operate stably in high-temperature environments exceeding 100℃. Furthermore, PU elastomers possess outstanding properties including wear resistance, chemical resistance, tensile strength, impact resistance, as well as shock and vibration damping.
Comparing to DETDA & DMTDA, there are some obvious advantages of MOCA as follows:
- The finished product is lighter in color.
- MOCA is a solid type; thus, it's much easier to store and causes less pollution.
- Easy to handle. Long pot life.
- Modulus is higher.
- Lower price.
Package
25, 50, 70 kg/fiber drum
25, 50, 70 kg/bag
It can be packaged on demand. Please inquire.
(1) Pre-heat prepolymer
- Temperature: 80℃~85℃
- Because the prepolymer is high viscous liquid or solid type, the pre-heating is necessary for workability.
- Beware: If pre-heating is last for too long, NCO content of prepolymer will be decreased, therefore, the pot life, demold time, hardness and physical properties will be changed.
(2) Degas prepolymer
- Below 30 mmHg.
- When the prepolymer is poured into the container, the degassing process is necessary because the small bubbles might cause decreasing of the physical properties of the molding goods when using.
- When processing, the quantity of prepolymer should not be over half of the container, otherwise, it might overflow during the degassing process.
- After degassing process, please keep the prepolymer at 80℃~85℃.
(3) Melt Hartcure MOCA
- The melting process is necessary due to MOCA is solid at room temperature (Melting point is 98℃).
- Melt it slowly at 110℃~120℃.
- Don’t melt MOCA twice. Thus, the properties of MOCA might be changed.
(4) Heat the mold
- Please keep the surface of mold at 100℃~110℃ after coating release agent on the mold.
- It’s better to heat the mold one day before working process.
(5) Mix prepolymer with MOCA
- Temperature: Prepolymer is at 80℃~85℃; MOCA is at 110℃~120℃
- Make sure the mixing ratio is correct, otherwise, the workability, hardness and other physical properties would be changed.
- Mix thoroughly and DON’T cause small bubbles in the solution.
(6) Cast
- Pour the solution into the mold as soon as possible after mixing. Otherwise, the viscosity will become too high to mold properly.
(7) Pre-cure and demold the mold
- Pre-cure at 100℃~110℃ in oven for 30~50 minutes before demolding.
- Beware: If the hardness of the molding product is low, increase the demolding time.
(8) Post cure
- Post-cure at 100℃~110℃ at least for 16 hours after demolding.
- The best physical properties come out after 3~7 days.
- If the hardness of the product is low, increase the post-curing time.
Chemical Name | 4,4'-Methylene bis (2-chloroaniline) |
CAS No. | 101-14-4 |
Molecular Weight (g/mol) | 267.16 |
Appearance | White to light yellow granule |
Melting Point (°C) | 98 ~ 107 |
Equivalent Weight | 133.58 |
Amine Value (mmol/g) | 7.4~7.6 |
Specific Gravity (@24°C) | 1.44 |
Specific Gravity (@107°C) | 1.26 |
Purity (%) | 99 min |
Package | 25 or 50 or 70 KGS/bag or fiber drum |
Self Life | 6 months since production date. |
- PU rollers, e.g. printing rollers...
- PU wheels, e.g. Trolley and scooter wheels...
- Shock absorber pads, e.g. automotive shock absorbers...
- PU waterproof architectural coatings
- Epoxy resin hardeners
- Sealing materials
- Insulation materials
- Other PU components, e.g. conveyor belts, baseball cores...