Benzoxazine intermediate and its preparation method
A technology for benzoxazine and intermediates, applied in the field of benzoxazine intermediates and their preparation, can solve problems such as not seen, and achieve the effects of simple and easy operation of the preparation method, excellent high temperature resistance and flame retardant performance
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[0029] The preparation method of one embodiment of the benzoxazine intermediate adopts a solution synthesis method, which includes the following steps:
[0030] Step 1. Quantify the phenol, primary amine, and aldehyde according to the molar ratio of phenolic hydroxyl, amine, and aldehyde functional groups of 1:(0.8-1.2):(1.5-2.5); the structural formula of the phenol is as follows:
[0031] (Equation 2)
[0032] R in formula 2 1 Is O, C=O, S, SO 2 , C 3-20 alicyclic hydrocarbons and their derivatives, C 1-20 aliphatic hydrocarbons and their derivatives, or C 2-20 unsaturated aliphatic hydrocarbons and their derivatives. The primary amine is: NH 2 R 2 , Where R 2 Alicyclic hydrocarbons with 3 to 20 carbon atoms and their derivatives, aliphatic hydrocarbons with 1 to 20 carbon atoms and their derivatives, or unsaturated aliphatic hydrocarbons with 2 to 20 carbon atoms and their derivatives, such as allyl Base amine, aniline, cyclopropylamine, methylamine, or ethylamine. The aldehyde...
Example Embodiment
[0042] Example 1:
[0043] Preparation of benzoxazine intermediates by solution synthesis
[0044] At room temperature, dissolve phenol in absolute ethanol, adjust the pH to 8-10, add toluene, aniline and formaldehyde aqueous solution at a molar ratio of phenolic hydroxyl, amine and aldehyde functional groups of 1:1:2. After stirring, the temperature is heated and refluxed. After 4 hours of reaction, ethanol and water toluene are distilled out under reduced pressure. The cooling device is added with methyl ethyl ketone to obtain a light yellow translucent viscous body. After washing, purification and drying, the benzoxazine intermediate is obtained. The yield was 80.5%. The structural formula of the obtained benzoxazine intermediate is shown below:
[0045]
Example Embodiment
[0046] Example 2:
[0047] Preparation of benzoxazine intermediates by solution synthesis
[0048] At room temperature, dissolve the phenol in absolute ethanol, adjust the pH to 8-10, add toluene, aniline and paraformaldehyde at a molar ratio of phenolic hydroxyl, amine and aldehyde functional groups of 1:1.2:2.5. After stirring uniformly, the temperature is raised and refluxed. After 4 hours of reaction, ethanol, water and toluene are distilled out under reduced pressure. The device is cooled to obtain a light yellow translucent viscous body. After washing, purification and drying, the benzoxazine intermediate is obtained. The yield was 78.8%. The structural formula of the obtained benzoxazine intermediate is shown below:
[0049]
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