No-halogen fire-proof phosphorus-containing compound with high heat stability and its prepn
A high thermal stability, compound technology, applied in chemical instruments and methods, compounds of Group 5/15 elements of the periodic table, organic chemistry, etc., can solve problems such as use restrictions, insufficient thermal stability, etc. The effect of strong resistance, high phosphorus content and thermal stability
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Embodiment 1
[0036] In a four-necked round-bottomed flask equipped with a nitrogen inlet, a condenser and a thermometer, add a solution of DOPO (compound 1) in dimethylformamide, pass nitrogen, control the temperature at 90 ° C, and drop the equivalent of The dimethylformamide solution of diphenylmethane bismaleimide (compound 2) with half the number of DOPO moles (that is: the molar ratio of compound 1: compound 2 is 2: 1), the dropwise process temperature is controlled at Around 90°C. After the dropwise addition, the temperature rose to 110°C. After two hours of reaction, the reaction was stopped, washed with ethanol, and dried in vacuum at 80°C to obtain a white solid substance with a melting point of 233°C——DOPO derivative A.
Embodiment 2
[0038] In a four-necked round-bottomed flask equipped with a nitrogen inlet, condenser and thermometer, add diphenylmethane bismaleimide (compound 2) and DOPO twice its molar number, nitrogen, and the reaction mixture is heated to 180°C, temperature controlled and reacted for 4 hours. After the reaction was completed, a quantitative amount of xylene was added. Stir and filter. The obtained solid was washed twice with xylene, and dried under vacuum at 100°C to obtain a white solid with a melting point of 233°C——DOPO derivative A.
Embodiment 3
[0040] In a four-neck round-bottomed flask equipped with a nitrogen inlet, a condenser and a thermometer, add a solution of DOPO in dimethylformamide, pass nitrogen, control the temperature at 90°C, and add a solution equivalent to the number of moles of DOPO dropwise within two hours. Half of the dimethylformamide solution of benzophenone bismaleimide (compound 2), the temperature of the dropping process is controlled at about 90°C. After the dropwise addition, the temperature rose to 110°C. After two hours of reaction, the reaction was stopped, washed with ethanol three times, and dried in vacuum at 80°C to obtain a white solid substance——DOPO derivative B.
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