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A kind of high temperature and high pressure resistant polyimide composite gas cylinder and preparation method thereof

A technology of polyimide and composite materials, which is applied in the field of composite materials, can solve the problems of affecting bearing strength, weak high-temperature bearing capacity, reducing the burst pressure of gas cylinders, etc., and achieve the effect of alleviating relative movement

Active Publication Date: 2020-12-25
AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Applying it to composite gas cylinders is an idea to solve the weak high-temperature bearing capacity of existing materials. However, during the research process, it was found that due to the high curing temperature of polyimide, the thermal expansion of the metal liner and the composite material is obviously inconsistent. At the same time Its curing process is difficult to control. During the reaction process, it needs to go through multiple stages such as solvent volatilization, amidation, imidization, cross-linking and curing. The whole process is relatively complicated, and there are many process parameters that need to be controlled.
In addition, high temperature resistant polyimide resin is only suitable for the solution winding process. Polyimide resin contains solvent, which needs to be removed after winding. After removing the solvent, the fiber will shrink, and the fiber will buckle after curing. Reduce the burst pressure of gas cylinders and affect the bearing strength

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0072] After sandblasting the stainless steel metal liner, use alcohol to remove surface impurities and oil stains, install the metal liner on the winding machine, and spread the buffer layer. The preparation method of the buffer layer is as follows: 100 parts of YH-550 polyimide, Add 10 parts of Vespel thermoplastic polyimide to 250 parts of N,N-dimethylacetamide (DMAC) (boiling point 166°C), stir at 115°C for 3 hours, and then add 1 part of polystyrene Ethylene oligomer (thermal decomposition temperature 325°C) is ultrasonically mixed, and the prepared area density is 30g / m 2 Chopped carbon fiber mat, use the solution method to coat the prepared glue on the chopped carbon fiber mat according to the predetermined thickness on both sides, heat it at 60℃h for 0.5h, attach the isolation film, and make a film with a thickness of 0.1mm .

[0073] Then take two shafts of T1000 carbon fiber, prepare YH-550 polyimide solution, pour the prepared polyimide resin solution into the dipp...

Embodiment 2

[0078] Buffer layer preparation: Add 100 parts of YH-550 polyimide and 20 parts of Vespel thermoplastic polyimide to 250 parts of N,N-dimethylacetamide (DMAC), stir at 115°C for 3 hours, and wait until the mixture is uniform After completely dissolving, then add 1 part of polystyrene oligomer and ultrasonically mix evenly to prepare surface density of 30g / m 2 Chopped carbon fiber mat, use the solution method to coat the prepared glue on the chopped carbon fiber mat according to the predetermined thickness on both sides, heat it at 60℃h for 0.5h, attach the isolation film, and make a film with a thickness of 0.1mm .

[0079] The rest of the steps are the same as in Example 1. The obtained high temperature and high pressure resistant polyimide composite gas cylinder is subjected to a room temperature water pressure burst test and a high temperature withstand pressure test, and the performance is similar to that of Example 1.

Embodiment 3

[0081] Except for 3 parts of polystyrene oligomer, the preparation of the rest of the buffer layer was the same as in Example 2 to obtain a 0.1 mm film.

[0082] The rest of the steps are the same as in Example 1. The obtained high temperature and high pressure resistant polyimide composite gas cylinder is subjected to a room temperature water pressure burst test and a high temperature withstand pressure test, and the performance is similar to that of Example 1.

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Abstract

The invention provides a high temperature and high pressure resistant polyimide composite material gas cylinder and a preparation method thereof. The gas cylinder consists of a metal inner liner and acomposite material shell. The composite material shell consists of a buffer layer and a winding layer. The buffer layer is a polyimide carrier glue film. The winding layer is a fiber bundle impregnated with polyimide resin. The buffer layer is adhered to the outer surface of the metal inner liner. The winding layer alternately winds the outer layer of the buffer layer in an order of H-Z-H-Z-...-H-Z-H, The buffer layer and the winding layer are co-cured to obtain the composite material shell. According to the invention, the polyimide carrier glue film buffer layer is introduced between the metal inner liner and the polyimide winding layer. The polyimide composite material gas cylinder is designed based on double functions of bonding and thermal stress buffering, and so the flue film can achieve in-situ foaming at a high curing temperature, the high toughness of the glue film can achieve good bonding between the composite material and the metal structure, the peeling strength is improved, potential corrosion can be acoided, and the thermal stress matching between the metal inner liner and the composite material during a high temperature curing and cooling process of the resin can beenhanced.

Description

technical field [0001] The invention relates to a gas cylinder of high temperature and high pressure resistant polyimide composite material and a preparation method thereof, belonging to the technical field of composite materials. Background technique [0002] With the rapid development of aerospace technology, missiles and aircraft are developing in the direction of high speed, long-distance, and structural and functional integration. The flight speed of missiles and aircraft can reach Ma3-4, and some even break through Ma6. The problem of aerodynamic heating makes the projectile structure face an increasingly harsh working environment. The high temperature environment also limits the application of many commonly used subsonic projectile structural materials such as aluminum alloy and epoxy composite materials. In order to further adapt to the large load of the aircraft Due to the multiple requirements of ammunition volume and long range of missiles, the structure of the mi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F17C1/06F17C13/00B29D22/00B29C70/32B29C70/34B29C70/44
CPCB29C70/32B29C70/342B29C70/446B29D22/003F17C1/06F17C13/002F17C2203/012F17C2209/2163F17C2209/232F17C2221/014F17C2223/0123
Inventor 柯红军张维军王国勇
Owner AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH