A kind of polyimide nanofiber film and preparation method thereof

Abstract

The invention relates to a polyimide nano fibrous membrane. The polyimide nano fibrous membrane comprises first-kind polyimides and second-kind polyimides, wherein the second-kind polyimides are located on surface layers of the first-kind polyimides and are bonded mutually. According to the polyimide nano fibrous membrane, through reasonably designing the material structure of the polyimide nano fibrous membrane, the mechanical properties of the polyimide nano fibrous membrane are improved while good heat resistance for the polyimide nano fibrous membrane is ensured, thus, the processability of the polyimide nano fibrous membrane is improved, and the designability of products is greatly improved. In addition, by adding additives, the mechanical properties and heat resistance of the polyimide nano fibrous membrane are further improved.

Description

technical field [0001] The invention relates to a polyimide nanofiber membrane and a preparation method thereof. [0002] technical background [0003] Polyimide is a class of polymer materials containing imide rings in the main chain. Due to the stable aromatic heterocyclic structure in the main chain, it exhibits excellent performance unmatched by other polymer materials. As an advanced composite material matrix, it has outstanding temperature resistance and excellent mechanical properties, and is currently one of the materials with the highest temperature resistance among resin-based composite materials. Due to its excellent flame retardancy and temperature resistance, polyimide is widely used in aerospace, medical, electronics and other fields. Polyimide nanofiber membrane is generally polyimide melt, solution or precursor solution, under the action of a high-voltage electrostatic field, the melt and solution flow and deform, and then evaporate through the solvent or th...

AI Technical Summary

Problems solved by technology

[0004] However, in the current polyimide nanofiber membrane prepared by electrospinning, due to the loose accumulation of polyimide nanofibers and the weak interaction force between nanofibers, the mechanical properties of the nanofiber membrane itself are too low, which affects the polyimide nanofiber membrane. Popularization and Utilization of Imide Nanofiber Membrane

In the prior art, patent CN102766270A uses alkali treatment method to pretreat polyamic acid fiber, and then prepares polyimide fiber membrane by high temperature hot pressing and heat closed loop method, but this solution is prepared by using alkali treatment method, It increases the production steps of the fiber membrane, and the method of alkali treatment must also include steps such as washing with water, which greatly increases the preparation process of the fiber membrane, increases the cost, and is not suitable for large-scale promotion

In the patent CN104213333A, polyimide and polyolefin are composited. First, a polyimide film is prepared, and then polyolefin is deposited on the surface of the polyimide film, and then the two are hot-pressed and composited. This step prepares a polyimide film Polyolefin is included in the film, which greatly reduces the heat-resistant temperature of the polyimide film. At the same time, the properties of polyolefin and polyimide are very different. very limited

At the same time, other polyimide composite films also greatly reduce the heat resistance of the film, and are also limited by compatibility issues, resulting in limited performance increase.

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