I am making a sheet of Polymer(powder form) with the help of Epoxy Resin and Hardner, so what Ratio should i used of Resin and Hardner w.r.t to the polymer in wt%, for the High Mechanical strength polymer sheet ?
Such a key data should be provided by the manufacturer, as it may depend on the formulations. Generally, there is a resin/hardener volume ratio of 2/1, but as I said, it may change depending on the origin of the products. You should rely on the recommendations given foy your own epoxy.
Alain
In most cases you should use the stoichiometric ratio between the epoxy and the active hydrogen (amine) to get the highest strength. Epoxy equivalent and amine content is usually given by the manufacturer. (The same is true for anhydrides). Slightly off-stoichiometric composition may still work but the Tg and the strength will be lower, perhaps the impact strength may improve somewhat.
2/3 epoxy for 1/3 hardner
you can added the catalyst in 1% in the case of anhydride hardner
The curing of epoxy resins is associated with a change in state from a low molecular weight liquid mixture to a highly cross-linked network. Many commercial hardeners suitable as curing agents have been used for epoxy resins. The most common types of curing agents are (1) primary, secondary polyamines and their adducts, (2) anhydrides, (3) polyamides, and (4) catalytic types.
Fully cured epoxy normally provides a good mechanical property. However, this depends on type of epoxy system. Attachment is an example of how to calculate the amount of amine hardener which used for curing of an epoxy.
Hope this will help
Regards,
The ratio can be known by the equivalent weight of epoxy resin and hardener. If the equivalent weight of epoxy resin is 160 and the equivalent weight of hardener is 40 it means the ratio epoxy resin to hardener must be 160:40 which is 4:1.
On the other hand, the manufacturer's companies sometimes recommend a particular ratio of its epoxy resin and hardener products for particular mechanical properties!
Dear Saurabh Kumar,
I have attached a book which can be used as reference that the ratio of resin and hardener has been determined according to the type of resin and hardener.
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