[mehrdadtaheran]

Hi everyone
I want to use shellac (the resin that is used for coil winding) for making a composite. I know that thin layers of shellac can be dried and hardened while exposing to air . but thick layer of it remain elastic and soft after even 4 hours of heat exposure and 2 months air exposure. Does anybody know a hardener for it to dry and harden it in 2-10 hours?

[billnotgatez]

Did you GOOGLE
shellac hardener
I got lots of hits

[mehrdadtaheran]

They are trade name. I want to know the functionality of them. For example if they contain carboxilic acid, I could try different kind of them.

[billnotgatez]

I would ask the company for its MSDS (material safety data sheet)
or check the patent for the product

If I had more patience I probably would have found the MSDS
using GOOGLE

I found a hardener but not sure it is used for shellac
that had the following in it

Xylene
Ethylbenzene 
Methyl ethyl ketone
n-Butyl acetate 
Isobutyl acetate 
Propylene glycol monomethyl ether acetate
Hexamethylene diisocyanate 

Sometimes you have to play with GOOGLE to get the answer you want

[mehrdadtaheran]

these materials are solvent except hexamethylene diisocyanate. this material can react with active hydrogens in alcohols and  amines.
who know the building blocks of shellac? is it full of alcoholic hydrogens? 

[billnotgatez]

Shellac is a partially a product produced in nature
http://en.wikipedia.org/wiki/Shellac
I am not sure it has be entirely characterized
Did you have any luck checking the patents for the hardeners