The cross-linking density of the hybrid resin was enhanced by adding diethylene triamine into the emulsion and reacted with block isocyanate and epoxide group at 80[degrees]C in the interior of the emulsion particles.(24), (25) Therefore, the above-obtained resin can incorporate the rigidity and adhesion property of polyurethane.
1,4-Butanediol, diethylene triamine, acetone, l-methyl-2-pyrrolidone (NMP), isopropanol, and triethylamine (TEA) having purity of 99.5% were purchased from Guangzhou Guanghua Company Limited (Guangzhou, China).
Finally, reaction temperature of emulsion was raised to 80[degrees]C, and 7.66 g diethylene triamine was added to the emulsion and reacted for 2 h.
Diethylene triamine with the molar ratio of amine and blocked isocyanate at 1:1 was added to the emulsion.
The effects of different types of amine chain extender, such as ethylene diamine and diethylene triamine, on the performance of the crosslinked emulsion and cast film were studied.