Preparation method of hyperbranched melamine cyanurate (MAC) flame retardant and application of hyperbranched MAC flame retardant in polyamide 6 (PA6) materials

[0041] Implementation method one

[0042] (1) Use an electronic balance to accurately weigh phthalic anhydride, dissolve it in N,N-dimethylacetamide (DMAc), and place it in a beaker to fully dissolve it. Add diisoanolamine to the three-necked flask and stir well. Drop the fully dissolved phthalic anhydride into a three-necked flask and react for 3 hours at room temperature to obtain AB 2 monomer.

[0043] (2) First add toluene to the above system, weigh trimethylolpropane, use a small amount of DMAc to fully dissolve it, then add it to a three-necked flask, then add p-toluenesulfonic acid, and heat to 130°C to condense and reflux, spherical condensation There is reflux in the tube, and the heat preservation reaction is 7-8h.

[0044] (3) Add TDI to the hyperbranched polymer obtained above, and add p-toluenesulfonic acid as a catalyst, stir uniformly, react at a constant temperature for 6 hours, and distill under reduced pressure. The result is an isocyanate-terminated hyperbranched p

[0048] Implementation method two

[0049] (1) Use an electronic balance to accurately weigh phthalic anhydride, dissolve it in N,N-dimethylacetamide (DMAc), and place it in a beaker to fully dissolve it. Add diisoanolamine to the three-necked flask and stir well. Drop the fully dissolved phthalic anhydride into a three-necked flask and react for 3 hours at room temperature to obtain AB 2 monomer.

[0050] (2) First add toluene to the above system, weigh trimethylolpropane, use a small amount of DMAc to fully dissolve it, then add it to a three-necked flask, then add p-toluenesulfonic acid, and heat to 130°C to condense and reflux, spherical condensation There is reflux in the tube, and the heat preservation reaction is 7-8h.

[0051] (3) Add TDI to the hyperbranched polymer obtained above, and add p-toluenesulfonic acid as a catalyst, stir uniformly, react at a constant temperature for 6 hours, and distill under reduced pressure. The result is an isocyanate-terminated hyperbranched p

[0055] Implementation method three:

[0056] (1) Use an electronic balance to accurately weigh phthalic anhydride, dissolve it in N,N-dimethylacetamide (DMAc), and place it in a beaker to fully dissolve it. Add diisoanolamine to the three-necked flask and stir well. Drop the fully dissolved phthalic anhydride into a three-necked flask and react for 3 hours at room temperature to obtain AB 2 monomer.

[0057] (2) First add toluene to the above system, weigh trimethylolpropane, use a small amount of DMAc to fully dissolve it, then add it to a three-necked flask, then add p-toluenesulfonic acid, and heat to 130°C to condense and reflux, spherical condensation There is reflux in the tube, and the heat preservation reaction is 7-8h.

[0058] (3) Add TDI to the hyperbranched polymer obtained above, and add p-toluenesulfonic acid as a catalyst, stir uniformly, react at a constant temperature for 6 hours, and distill under reduced pressure. The result is an isocyanate-terminated hyperbranche