A novel amide-type benzoxazine resin and its one-step preparation method

Abstract

The invention belongs to the technical field of thermosetting resins, and specifically provides a novel amide-type benzoxazine resin and a one-step preparation method thereof. The preparation method uses aromatic amide compounds, aromatic phenol compounds and paraformaldehyde as raw materials, adopts a solution method, and reacts at 30-80 DEG C for 3-12 hours. After the reactants were cooled to room temperature, the pure oxazine monomers were obtained through washing, drying and crystallization steps, respectively. Compared with the traditional one-step preparation method of benzoxazine, the invention has the advantages of simple synthesis process, no need for inert gas protection, high product purity and mild reaction conditions. Moreover, compared with the use of primary amine compounds in the existing benzoxazine synthesis, the method uses aromatic amide compounds as reaction raw materials, which avoids the shortcomings of easy oxidation of primary amine compounds, and the easy formation of primary amines and formaldehyde in the reaction. The side reaction of Schiff base increases the yield of benzoxazine.

Description

technical field [0001] The invention belongs to the technical field of thermosetting resins, and relates to a novel benzoxazine resin and a one-step preparation method thereof, in particular to a carbonyl-containing amide-type benzoxazine resin and a preparation method thereof. The novel amide-type benzoxazine resin of the present invention is mainly used for the matrix resin of composite materials. Background technique [0002] Benzoxazine resin is a thermosetting resin. The monomer can be cross-linked by ring-opening under the action of heating or catalyst to generate polybenzoxazine. Polybenzoxazine not only has good thermal and mechanical properties, but also has advantages that other thermosetting resins do not have. For example: no small molecules are released during curing, no strong acid and strong base catalysis is required for curing, low hygroscopicity, high flame retardancy, low dielectric property, high carbon residual rate, excellent molecular design flexibil...

AI Technical Summary

Problems solved by technology

Because primary amine compounds are easily oxidized in the air and become invalid, nitrogen or other inert gas protection is often required during the synthesis process, which will bring additional additional costs; Side reactions are prone to occur in the process and generate Schiff bases. This side reaction will lead to a decrease in the yield of the target product. Therefore, it is necessary to well control the reaction conditions and the reaction process during the preparation process.

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