A kind of aramid nanofiber film composite aramid paper and preparation method thereof

Abstract

The invention discloses an aramid paper compounded with an aramid nanometer fiber thin film and a preparation method thereof. The aramid paper is compounded by a surface layer, a core layer and a bottom layer through a wet type papermaking laminating method, wherein the ratio of the surface layer to the core layer to the bottom layer is (5 to 20):(60 to 90):(5 to 20) in parts by weight of absolutedry fiber; the surface layer and the bottom layer respectively adopt aramid nanometer films which are prepared from aramid nanometer fibers; the core layer adopts the aramid paper which is prepared from one of aramid chopped fibers and aramid pulp fibers or aramid precipitated fibers. The aramid paper has the advantages that because of excellent strength property and dense thin film structure ofthe aramid nanometer fiber film, more bonding sites are provided for bonding with the fiber components of the aramid paper, and the larger pores can be filled and coated; the comprehensive property ofthe final product is greatly improved, and the aramid paper is favorably widened to the high-end application field.

Description

technical field [0001] The invention belongs to the field of polymer nanomaterials and papermaking, and in particular relates to aramid nanofiber film composite aramid paper and a preparation method thereof. Background technique [0002] Para-aramid fiber (PPTA) is a high-performance synthetic fiber with high strength, high modulus, excellent insulation and high temperature resistance, and is an ideal raw material for protective and reinforcing materials. Para-aramid paper is made of para-aramid chopped fibers and para-aramid pulp fibers or para-aramid fibrids as raw materials through wet papermaking and hot-pressing process. In para-aramid paper, chopped fibers are used as a skeleton material, which is evenly dispersed in the paper, which determines the physical strength and mechanical structure of the paper; aramid pulp is used as a filling and bonding material, which is softened and deformed during the hot pressing process Stretching, forming the overall mechanical struc...

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Problems solved by technology

But this kind of method has the following problems: First, no matter what kind of non-aramid film is used, such as PET or PPS or PI film, there are differences in the strength performance, heat resistance and thermal conductivity of the film itself and aramid paper Sexual problems, resulting in the performance of the final product being limited by materials with poorer performance. For example, PET film composite aramid paper is more prone to warping, shrinkage or wrinkling, and it is difficult to obtain products with excellent quality and stability; second, in the paper film Adhesives are still needed for most of the composite processing, and ordinary adhesives will limit the final performance of the product. When paper products are applied to wet oil-immersed transformers, there may be adhesives that dissolve into insulating oil or lubricating oil, resulting in product quality problems

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