Preparation method of polyimide intercalation grafted magnesium hydroxide flame retardant
A technology of polyimide and magnesium hydroxide is applied in the field of preparation of polyimide intercalation grafted magnesium hydroxide flame retardant, which can solve the problems of hydrogen chloride generation and large amount of smoke, and achieves low cost, three wastes and the like. Less and more productive effects
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Embodiment 1
[0025] First prepare the polyimide prepolymer: at room temperature, first dissolve 1 part by weight of 3,3'4,4'-benzophenone tetracarboxylic dianhydride in 7 parts by weight of dimethyl sulfoxide to prepare into solution A, then 10 parts by weight of triphenylmethane triisocyanate and 5 parts by weight of m-phenylenediamine are dissolved in 25 parts by weight of dimethyl sulfoxide to prepare solution B, and solution A and B is mixed, and then under the condition of nitrogen protection, the reaction vessel is added to the oil bath for reaction, magnetically stirred and the reaction temperature is 70°C, the reaction time is 30min, the rotation speed is 1500r / min, and then the temperature is raised to 140°C, The reaction time is 30min. After the reaction is over, stop heating, and leave the reaction solution for 3h to cool to room temperature to obtain a polyimide prepolymer;
[0026] Then prepare modified nano-magnesium hydroxide: first prepare a silane coupling agent solution w...
Embodiment 2
[0030] First prepare the polyimide prepolymer: at room temperature, first dissolve 1 part by weight of 3,3'4,4'-benzophenone tetracarboxylic dianhydride in 7 parts by weight of dimethyl sulfoxide to prepare into solution A, then 10 parts by weight of diphenylmethane diisocyanate MDI, 5 parts by weight of m-phenylenediamine are dissolved in 25 parts by weight of dimethyl sulfoxide to prepare solution B, and solution A and B is mixed, and then under the condition of nitrogen protection, the reaction vessel is added to the oil bath for reaction, magnetically stirred and the reaction temperature is 70°C, the reaction time is 30min, the rotation speed is 1500r / min, and then the temperature is raised to 140°C, The reaction time is 30min. After the reaction is over, stop heating, and leave the reaction solution for 3h to cool to room temperature to obtain a polyimide prepolymer;
[0031] Then prepare modified nano-magnesium hydroxide: first prepare a silane coupling agent solution wi...
Embodiment 3
[0035] First prepare the polyimide prepolymer: at room temperature, first dissolve 1 part by weight of 3,3'4,4'-benzophenone tetracarboxylic dianhydride in 7 parts by weight of dimethyl sulfoxide to prepare into solution A, then 10 parts by weight of diphenylmethane diisocyanate MDI and 5 parts by weight of p-phenylenediamine are dissolved in 25 parts by weight of dimethyl sulfoxide to prepare solution B, and solution A and B is mixed, and then under the condition of nitrogen protection, the reaction vessel is added to the oil bath for reaction, magnetically stirred and the reaction temperature is 70°C, the reaction time is 30min, the rotation speed is 1500r / min, and then the temperature is raised to 140°C, The reaction time is 30min. After the reaction is over, stop heating, and leave the reaction solution for 3h to cool to room temperature to obtain a polyimide prepolymer;
[0036] Then prepare modified nano-magnesium hydroxide: first prepare a silane coupling agent solution...
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