Tetrahydromethylphthalic anhydride CAS 19438-64-3 MTHPA is epoxy resin curing agents, solvent free paints, laminated boards, epoxy adhesives, etc. With the many advantages, e. G. Long-term storage at room temperature, low freezing point, small volatilization and low toxicity. MTHPA is widely used in electric machines, dry-type transformers, high voltage switches, mutual inductance equipments, horizontal output transformers, household appliances capacitors, power capacitors and resistances, and the impregnating, casting and wrapping of integrated circuits.
Properties
- Colorless to slight yellow liquid
- It has high purity and light color and luster. It can be directly adjusted into all kinds of colorful epoxy resin products.- It has low viscosity. It has the characteristics like: good casting, embedment and impregnation technology. It can improve the performance of curing material and the affinity of lamination and basic material.
- It has the characteristics like: stable performance, low freezing point and long using life. It can be stored for a long time at room temperature and easy for pipeline transportation. It is suitable for production automation and severe cold region.
- It has small volatility and low toxicity, only 1/20 – 1/40 toxicity of the amine curing agent. Its irritation to human eyes and skin is small.
-It has good dissolubility. This product can dissoluble with all epoxy resins. The mixing viscosity is low, meanwhile, has low pyrogenic effect and shrinkage during the heated curing process.
Specification
Appearance |
Light yellow transparent liquid |
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Color (Pt-Co) |
≤200 |
≤200 |
≤300 |
≤200 |
≤80 |
≤200 |
Crystallization point |
≤10℃ |
≤-5℃ |
≤-15℃ |
≤-15℃ |
≤-15℃ |
≤-15℃ |
Acid value, (mgKOH/g) |
660.0~685.0 |
660.0~685.0 |
660.0~685.0 |
660.0~685.0 |
660.0~685.0 |
660.0~685.0 |
Anhydride conten |
≥40.5% |
≥40.5% |
≥40.5% |
≥40.5% |
≥40.5% |
≥40.5% |
Viscosity (Pa.s, 25℃) |
0.03~0.06 |
0.03~0.06 |
≤0.05 |
≤0.05 |
≤0.05 |
0.03~0.08 |
Density (g/cm3, 20℃) |
1.210±0.05 |
1.210±0.05 |
1.210±0.05 |
1.210±0.05 |
1.210±0.05 |
1.210±0.05 |
Free acid |
≤0.50% |
≤0.50% |
≤0.50% |
≤0.50% |
≤0.50% |
≤0.50% |
Application
Methyl tetra-Hydro Phthalic Anhydride (MTHPA) was used in the curing agents for epoxy resins, dry-type transformers, high voltage switches, mutual inductors, condensers, LED, etc. Relative to the general MTHPA, this specification have the following characteristics:
- Light color when curing ,suitable for white or colorless transparent products;- Good heat resistance, higher Tg point.
- Faster curing speed , saving the amount of promoter;
- Larger viscosity, moisture absorption higher than the general MTHPA, shall be sealed.
Packing
220kg per Steel drum ,17.6mt/20’FCL;
1150kg/IBC Drum, 20.7mt/20’FCL;23mt/ISO Tank
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