Polyimide prepolymer as well as preparation method and application thereof

Abstract

The invention discloses a polyimide prepolymer as well as a preparation method and application thereof. The preparation method comprises the following steps: (1) adding aromatic dianhydride into a lower alcohol solvent, and conducting stirring and heating to reflux reaction to obtain a first esterified solution; (2) adding a benzyne end-capping reagent into a lower alcohol solvent, and conducting stirring and heating to reflux reaction, so as to obtain a second esterified solution; (3) adding aromatic diamine into a lower alcohol solvent, conducting stirring and dissolving, simultaneously adding the first esterified liquid obtained in the step (1) and the second esterified liquid obtained in the step (2), and carrying out polymerization reaction at room temperature; and (4) carrying out imidization on the reaction system obtained in the step (3) to obtain the polyimide prepolymer. According to the polyimide prepolymer disclosed by the invention, the low-boiling-point low-alcohol solvent is esterified with the aromatic dianhydride and the benzyne end-capping reagent firstly, and then is polymerized with the aromatic diamine monomer, so that low energy consumption can be realized, and the low-alcohol solvent is more favorable for recycling, thereby greatly reducing the production cost.

Description

technical field [0001] The invention belongs to the technical field of thermosetting polyimide, and in particular relates to a polyimide prepolymer and its preparation method and application. Background technique [0002] Fiber-reinforced polyimide resin-based composites are widely used in high-tech fields such as aviation, aerospace, and space due to their excellent properties such as high specific strength, high specific modulus, high temperature resistance, and corrosion resistance. Generally, resin-based composite materials are prepared by compression molding or autoclave molding. These molding processes are widely used, but there are still some problems: for example, it is difficult to prepare parts with complex structures, small volumes, high dimensional accuracy requirements, or large thickness; In addition, factors such as large labor workload, high production cost, and easy pollution of the environment in these molding processes also limit the development of composi...

AI Technical Summary

Problems solved by technology

Generally, resin-based composite materials are prepared by compression molding or autoclave molding. These molding processes are widely used, but there are still some problems: for example, it is difficult to prepare parts with complex structures, small volumes, high dimensional accuracy requirements, or large thickness; In addition, these molding processes have a large labor workload, high production costs, and are prone to pollute the environment and other factors also limit the development of composite materials.

[0006] This preparation method not only has high energy consumption, but also the waste liquid cannot be recycled, resulting in high cost, and is not suitable for industrialized large-scale production