A kind of modified boron phenolic resin and its preparation method and application
A boron phenolic resin and silicon modification technology, applied in the field of modified phenolic resin and its preparation, can solve the problems of dispersibility of modified phenolic resin, ammonia escape, environmental pollution, etc., and achieve improved ablation resistance and mechanical properties Performance, improved thermal stability and flame retardancy, simple preparation method
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Embodiment 1
[0063] The preparation of embodiment 1 silicon modified boron phenolic resin
[0064] Preparation of boron phenolic resin: first suck 956g of molten phenol into the reactor by vacuum, add 155g of boric acid while stirring, slowly raise the temperature to 140°C at a rate of 0.5°C / min, and then gradually increase the temperature to 140°C at a rate of 0.2°C / min 164°C, then gradually increase the temperature to 181°C at a rate of 0.1°C / min, control the column head temperature not to exceed 98°C, collect fractions, stop heating when the weight of the fraction reaches 0.2 times the weight of phenol, and discard the fraction. Cool down to 60°C; add a total of 344g of paraformaldehyde into the reactor twice, control the heating rate at 0.2°C / min, and slowly raise the temperature to above 110°C until the reaction system starts to boil and reflux; after reflux for 30-40min, it begins to decrease Pressure dehydration. When the gel time of the reaction system reaches 60s (200±1°C), the r...
Embodiment 2
[0070] The preparation of embodiment 2 silicon modified boron phenolic resins
[0071]Preparation of boron phenolic resin: first suck 956g of molten phenol into the reactor by vacuum, add 155g of boric acid while stirring, slowly raise the temperature to 140°C at a rate of 0.7°C / min, and then gradually increase the temperature to 140°C at a rate of 0.1°C / min. 164°C, then gradually increase the temperature to 181°C at a rate of 0.2°C / min, control the column head temperature not to exceed 98°C, collect fractions, and stop heating when the weight of the fraction reaches 0.2 times that of phenol. Cool the distillate to 60°C, add 344g of paraformaldehyde twice, control the heating rate to 0.1°C / min, and slowly raise the temperature to above 110°C until the reaction system starts to boil and reflux; after reflux for 30-40min, start dehydration under reduced pressure. When the gel time of the reaction system reaches 50s (200±1° C.), the reaction ends, and 536 g of ethanol is added to...
Embodiment 3
[0074] The preparation of embodiment 3 silicon modified boron phenolic resins
[0075] Preparation of boron phenolic resin: Same as in Example 2, when preparing boron phenolic resin, discharge immediately after the final reaction, without adding ethanol, to obtain boron phenolic resin block solid.
[0076] Preparation of silicon-modified boron phenolic resin: Take 70g of boron phenolic resin solid and add it to the reaction kettle, slowly raise the temperature to 50-60°C to melt it completely, add 10g of ethyl orthosilicate, 30g of isopropyl orthosilicate and methyl orthosilicate Add 10 g of the ester into the separatory funnel, dropwise complete within half an hour, and react for 4 hours to obtain the silicon-modified boron phenolic resin.
[0077] Infrared spectrogram, thermogravimetric (TGA) curve and derivative thermogravimetric (DTG) curve are all similar to the results of Example 1, and will not be repeated one by one.
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