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Hydrazide Compounds

Latent Hardener for Resin Curing

Otsuka Chemical’s Hydrazide compounds are widely used in paint and adhesive thermoset applications. This includes latent hardeners for epoxy resins and as cross linking agents in acrylic emulsions with ketone groups. Through a combination with our several types of hydrazide compounds, you may easily control the curing speed and temperature of epoxy resins.

Advantages

  1. The reactivity is high, and it is possible to carry out the hardening at a low temperature.
  2. It is excellent as a latency hardener.
  3. It is possible to adjust the crosslink density.
  4. It is excellent in the adhesive property of hardened material.
  5. The hardened material of Tg is achieved.

General Properties

Product
Unit
ADH
SDH
DDH
IDH
SAH
Molecular weight
  174.2 230.3 258.4 194.2 152.2
Appearance
  White crystalline White crystalline White crystalline Whitish crystalline Whitish crystalline
Melting point
°C 177 ~ 183 186 ~ 188 188 ~ 192 215 ~ 225 145 ~ 155

Examples

Hydrazide Curing Speed

Product
Unit
MAI
ADH
SDH
DDH
IDH
DICY
Formulation
Epoxy resin
100 100 100 100 100 100
Curing agent
24 23 30 34 26 11
Gelling time
160°C
min 4 8 11 12 28 >60
140°C
26.5 49 >60 >60 >60 >80
120°C
>60 >60
Pot life (40°C)
day >90 >90 >90 >90 >90 >90
Tg (TMA)
°C 142 120 138 68