Method for preparing boron modified phenolic resin
The invention discloses a method for preparing boron modified phenolic resin. A three-step method is adopted, and the three-step method comprises the following steps: firstly, reacting an organic boron compound with aldehyde under an alkaline condition to generate hydroxymethylated organic boron, th...
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Format: | Patent |
Sprache: | eng |
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Zusammenfassung: | The invention discloses a method for preparing boron modified phenolic resin. A three-step method is adopted, and the three-step method comprises the following steps: firstly, reacting an organic boron compound with aldehyde under an alkaline condition to generate hydroxymethylated organic boron, then pre-polymerizing the hydroxymethylated organic boron with phenol under an acidic condition to form a short chain pre-polymer, and finally copolymerizing the short chain pre-polymer with aldehyde under the acidic condition to form branched boron modified phenolic resin with a high boron content. By adopting the method disclosed by the invention, the reaction activity of the boron compound is improved, the boron content in a molecular chain segment of the phenolic resin is improved, high molecular weight phenolic resin with a branch chain structure can be prepared, and the prepared boron modified phenolic resin is high in boron content and is excellent in heat resistance. |
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