Optimizing cure control and latency - Highlight

Advanced Materials

Optimizing cure control and latency

Quarter 1, 2014

Advanced Materials 2

Table of contents

Latent hardeners for epoxy resins Product selection Kinetics

Thermo-mechanical properties

Latent accelerators for epoxy resins Product selection DICY cure

Anhydride cure Homopolymerization


Product Latency / reactivity Impact on mechanical properties Chemical nature / form

Aradur® 1571* Good latency at RT - curing above 120°C

Standard modulus Medium Tg

Dispersion of DICY in epoxy resin

Aradur® 9506 Outstanding latency at RT - snap cure type behaviour above 70-80°C

Standard modulus Medium Tg

Fine yellow powder easily dispersible

XB 3473 Good latency at RT - curing above 140°C

Standard modulus High Tg

Liquid aromatic amine (~ 100 mPas)

Aradur® 9664-1 Very latent at RT Curing above 180°C

Standard modulus Very high Tg

4,4´-DDS Solid: fine powder easily dispersible Softening point 176 - 185°C

Aradur® 9719-1 Latent at RT Curing above 180°C

Highest modulus Very high Tg

3,3´-DDS Solid: fine powder easily dispersible Softening point 170 - 180°C

Latent hardeners for epoxy resins

Product selection

< Table of content Latent hardeners >

* In combination with Accelerator® 1573

Latent accelerators >

Advanced Materials


Kinetics Gel time at different temperature

4

* In combination with Accelerator 1573 Stoichiometric cure with Araldite® MY 790 - Gel time measured with Gelnorm®

< Table of content Latent hardeners > Latent accelerators >

Gel time at different temperature

Advanced Materials


Kinetics Time to reach 90 % conversion at different temperature

5

* In combination with Accelerator 1573 Stoichiometric cure with Araldite® MY 790 - Conversion measured with DSC (isotherm)


Time to reach 90 % conversion at different temperature

Advanced Materials


Kinetics Conversion and Tg versus time of cure at 110°C

6

* In combination with Accelerator 1573 Stoichiometric cure with Araldite® MY 790 - Tg onset measured via DSC


Conversion and Tg versus time of cure at 110°C

Advanced Materials


Kinetics Time to reach 90% conversion at 120°C and 180°C

7

Araldite® GY 250 (BisA-diglycidyl ether) + hardener mixed at stoichiometry Conversion measured with DSC (isotherm)


Time to reach 90% conversion at 120°C and 180°C



Thermo-mechanical properties Modulus and Tg

Araldite® GY 250 (BisA-diglycidyl ether) + hardener mixed at stoichiometry Cure profile: 2h at 150°C + 4h at 180°C + 2h at 200°C - Tg measured via DMA (Tan delta Peak)


Modulus and Tg


Product selection

Latent accelerators for epoxy resins

Product Latency / reactivity Impact on mechanical properties Form / processability EHS status

Aradur® 1167 Outstanding latency at 80°C Lower reactivity than TDI-uron at 120°C


Solid: easy to incorporate Softening point: 95°C

Not classified

Aradur® 1573 Good latency Lower reactivity than TDI-uron at 120°C

Similar to TDI-uron

Paste (75 000 mPa.s): easy to incorporate

Aradur® 3123 Slightly lower latency Faster reactivity than TDI-uron at 120°C


Solid: to be dispersed

Accelerator DY 9577

Good latency up to 80°C High reactivity above 120°C


Solid: easy to incorporate Melting point: 25-30°C

Not classified




DICY cure Time to reach 90% conversion at different temperature

100 parts Araldite® GY 250 (BisA-diglycidyl ether) + 25 parts Aradur® 1571 (DICY paste) + 6 parts accelerator Conversion measured with DSC (isotherm)



DICY cure Gel time measured at 80°C


Stoichiometric cure with DICY hardener / TDI-Uron or DICY hardener / Aradur® 1167 (100/46 pbw) Gel time measured with Gelnorm®


Gel time measured at 80°C


DICY cure Gel time measured at 120°C


Stoichiometric cure with DICY hardener / TDI-Uron or DICY hardener / Aradur® 1167 (100/46 pbw) Gel time measured with Gelnorm®


Gel time measured at 120°C


DICY cure Tg and flexural modulus


Stoichiometric cure with DICY hardener / TDI-Uron or DICY hardener / Aradur® 1167 (100/46 pbw) Cure profile: 2h at 100°C + 2h at 150°C + 2h at 220°C - Tg measured via DMA (G’ Onset)


Tg and flexural modulus


Anhydride cure Latency comparison vs. methyl imidazole - Viscosity build-up, time to reach 1 000 Pa.s


100 parts Araldite® GY 250 (BisA-diglycidyl ether) + 90 parts Aradur® 917 (MTHPA) + 3 parts accelerator Viscosity build-up measured with plate / plate dynamic viscosimeter



Accelerator for homopolymerization Reactivity - Time to reach 90% conversion at different curing temperature


6.0 pbw of Aradur® 3123 in 100 parts of epoxy resin



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Optimizing cure control and latency - Highlight

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