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Preparation method for polyimide-based aramid composite material

A technology of polyimide-based aramid and composite materials, which is applied in the preparation of polyimide-based aramid composite materials and the field of thermosetting polyimide-based aramid composite materials. Problems such as brittle fracture and low bond strength occur, and the effect of high temperature resistance and excellent insulation performance is achieved

Inactive Publication Date: 2013-11-20
上海舟汉纤维材料科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the current resin situation, there are still certain weaknesses, such as low toughness of the resin, easy brittle fracture, low bond strength, poor temperature resistance, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0024] 1. A preparation method of a polyimide-based aramid composite material, characterized in that it is composed of a polyimide resin matrix, a para-aramid filament or a para-aramid fabric, comprising the following steps.

[0025] (1) Preparation of impregnation solution

[0026] The viscous thermosetting polyimide resin is heat-treated at a temperature of 80-90° C., slowly poured into a diluent solvent and stirred to prepare a polyimide impregnation solution.

[0027] (2) Dipping

[0028] Pour the polyimide dipping solution into the dipping tank of the dipping machine, and para-aramid filaments or para-aramid fabrics enter the dipping tank at a speed of 0-5m / min to make aramid prepreg .

[0029] (3) Pre-curing

[0030] The aramid fiber prepreg obtained above is subjected to pre-curing treatment, the pre-curing temperature is 168-170° C., and the pre-curing time is 3-15 minutes.

[0031] (4) Layer

[0032] Lay the pre-cured aramid prepreg on the automatic ply machine a...

Embodiment 1

[0042] Put the viscous thermosetting resin new polyimide resin at a temperature of 90°C, slowly pour and stir the N,N'-dimethylformamide solvent, and keep the temperature at 50°C, and the polyimide The amine resin is diluted to a solids content of 65%. Pour the diluted polyimide resin into the dipping tank of the impregnation machine, and then enter the aramid filament into the three dipping tanks at a speed of 5m / min. The wet aramid prepreg needs to be prepreg Curing treatment, the pre-curing temperature is 170°C, and the curing time is 10 minutes to obtain a dry aramid fiber prepreg, and the glue content is controlled at 40%. The aramid prepreg is automatically placed in the laminator at 0°, and then heat-pressed. The heat-pressing pressure is 3.5MPa. The heat-pressing temperature is: 140°C / 1h, 160°C / 1h, 180°C / 1h, 200°C / 1h, 220-230°C / 4-5h, and then pressure-holding and cooling to obtain aramid fiber composite materials. After testing, the bending strength of the composite m...

Embodiment 2

[0044] Put the viscous thermosetting resin new polyimide resin at a temperature of 80°C, slowly pour N,N'-dimethylformamide solvent and stir, and keep the temperature at 55°C, and the polyimide The amine resin was diluted to 55% solids. Pour the diluted polyimide resin into the dipping tank of the impregnation machine, and then put the aramid fabric into the three dipping tanks at a speed of 3m / min. The wet aramid prepreg needs to be pre-cured Treatment, the pre-curing temperature is 168°C, and the curing time is 15 minutes to obtain a dry aramid fiber prepreg, and the glue content is controlled at 35%. The aramid prepreg is automatically placed in the laminator at 0°, and then heat-pressed. The heat-pressing pressure is 3.5MPa. The heat-pressing temperature is: 140°C / 1h, 160°C / 1h, 180°C / 1h, 200°C / 1h, 220-230°C / 4-5h, and then keep pressure and cool to obtain aramid composite material. After testing, the tensile modulus of the composite material is 7.86GPa, the flexural streng...

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Abstract

The invention discloses a preparation method for a polyimide-based aramid composite material and belongs to the field of composite material processing. The preparation method is characterized by comprising the following steps of: preparing presoak with a certain solid content by polyimide resin for soaking para-aramid filaments or fabrics; pre-solidifying the soaked para-aramid filaments or fabrics to obtain aramid prepreg; and laminating the aramid prepreg, and performing thermal press on the aramid prepreg to obtain the polyimide-based aramid composite material. The thermoset polyimide-based aramid composite material prepared by the method has the excellent performances of high intensity, high-temperature resistance, high insulation property and the like.

Description

technical field [0001] The invention relates to a preparation method of a polyimide-based aramid composite material, which belongs to the field of composite material processing, and specifically relates to a preparation method of a thermosetting polyimide-based aramid composite material. Background technique [0002] Para-aramid fiber is currently the most widely used and most demanded fiber among high-performance fibers in the world. It is the first choice for manufacturing high-strength lightweight armor and special composite materials. It is widely used in aerospace, aviation, military industry, electromechanical, and construction. , automobiles, sporting goods and other fields. [0003] Aramid composite materials are mostly bonded with aramid filament fibers and fabrics with thermosetting resins. There are two main factors affecting aramid composite materials: the bonding strength between layers of aramid reinforced composite materials and the toughness of thermosetting ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C70/34B29C70/54
Inventor 金伟龚伶伶周文奎汪海峰陆强华刘岳新
Owner 上海舟汉纤维材料科技股份有限公司
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