JP2001214999A - Composite material pressure vessel and method of manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a composite material pressure vessel that makes the most of the effects of a reinforcing composite material layer, exhibits high burst pressure resisting performance and is light in weight. SOLUTION: The composite material pressure vessel has a resin layer interposed between an inner liner and FRP. The resin layer is preferably a thermoplastic resin layer with an appreciable adhesive property and a high elongation percentage. Alternatively, a resin layer is interposed between the inner liner and FRP to form a filament-wound structure using towpreg. The inner liner may be a metallic inner liner.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lightweight pressure vessel used for a space storage device and the like and a method of manufacturing the same, and more particularly, to a composite material pressure vessel exhibiting a high burst pressure and its production. It is about the method.

[0002]

2. Description of the Related Art Generally, steel is widely used as a pressure vessel for accumulating a gas, and a fire extinguisher, a nitrogen gas vessel, a propane gas vessel and the like are widely known. However, steel containers are heavy and are not applicable in some applications. For example, a composite material pressure vessel using FRP as a reinforcing material is often used for space gas storage and aircraft applications that are required to be particularly lightweight. In addition, a lightweight composite material pressure vessel is applied to a natural gas vessel (NGV) which has been attracting attention in recent years, for example, in terms of environmental protection.

[0003] This type of pressure vessel is generally manufactured by a method of providing a reinforcing layer on a non-metal (mainly resin) or metal inner liner and, if necessary, a method of wet filament winding. I have.

That is, a filament (reinforcing fiber) is wound around a thin film hollow titanium liner (inner container) with a reinforcing layer such as a glass fiber toe or a carbon fiber toe impregnated with an epoxy resin composition, and a helical winding is performed. Filament winding is performed by continuously densely winding by winding or the like.

[0005] Thereafter, the whole is heated and cured in an oven for a predetermined time, and then cooled and cooled to solidify each part, thereby completing a fiber reinforced composite material pressure vessel. Needless to say, a structure in which only a reinforcing material such as FRP is wound without performing filament winding is used for a material having a low required strength.

Meanwhile, in the case of a composite material pressure vessel, there is an example in which the pressure vessel breaks before the breaking strain of the composite material. Observe the specimen after pressure rupture in detail,
As a result of the stress analysis, it was estimated that in the case of a pressure vessel that broke at a pressure lower than the expected value, slippage occurred between the metal liner and the composite material layer when a gap was formed between the layers.

[0007] However, in the above-mentioned conventional method, there is a problem that the resin is liquid at room temperature, and there is a problem that the mechanical properties of the composite material cannot be enhanced. In particular, a structure using a tow prep exhibiting high mechanical properties has a drawback in that a "gap" and "slip" occur between the inner container liner and the composite material layer, and the original high breaking pressure cannot be exhibited. .

[0008]

SUMMARY OF THE INVENTION The present invention was devised in view of the problems of the prior art, and maximizes the effect of the reinforcing composite material layer to achieve high burst pressure resistance. It is an object of the present invention to provide a lightweight composite material pressure vessel that can be used.

[0009]

According to the present invention, there is provided a composite pressure vessel comprising: an inner liner;
The structure is such that a resin layer is interposed between RPs. The resin layer may be a thermoplastic resin layer having excellent adhesion and large elongation. Alternatively, a composite material pressure vessel is formed by interposing a thermoplastic resin layer having excellent adhesion and large elongation between the inner liner and the FRP and winding the filament with a towpreg. In each of the above, the inner liner may be a metal inner liner. In the method for manufacturing a composite material pressure vessel according to the present invention, a resin layer is interposed between the inner liner and the FRP.

As described above, by interposing the thermoplastic resin having high adhesiveness and elongation between the metal container liner and the composite material layer, it is possible to provide a lightweight pressure container exhibiting a high breaking pressure.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION A specimen after pressure rupture was observed in detail, and as a result of stress analysis, in a composite material pressure vessel that was broken at a low pressure, a gap was formed between the metal liner and the composite material layer. Sliding occurred between the layers, and as a result, it was presumed that the pressure vessel was broken before the breaking strain held by the composite material.

It is known from the examination of the specimen after the pressure rupture that if a gap is formed between the liner and the composite material layer, slippage occurs between the layers and the strength is reduced. Considering that a resin having excellent adhesion and large elongation is interposed between layers is a solution, and it was confirmed that the phenoxy resin blended in the tow reg was applied to obtain a predetermined result.

Therefore, in the present invention, in order to achieve the above object, a thermoplastic resin having high adhesiveness and elongation is interposed between the container liner and the composite material layer. As a result, a lightweight pressure vessel that exhibits a high breaking pressure by suppressing the gap between layers and slippage generated when a pressure load is applied can be obtained.

Preferred resins applied to the present invention include:
Phenoxy resins, rubber-modified epoxy resins, urethane-modified epoxy resins, nylon-modified epoxy resins, and the like. Other than this, the same effect can be obtained if the resin is provided between the metal liner and the composite material and has excellent adhesiveness and elongation.

The inner liner is not limited to a metal liner, and can be applied to a non-metal liner with the same idea. In a composite material pressure vessel having a structure in which phenoxy resin is interposed between a metal liner and a composite material layer, sufficient strength can be obtained.

In order to manufacture the above-mentioned container, for example, a thin-film hollow liner made of titanium (inner layer container) is prepared, and glass fiber toe or carbon fiber toe impregnated with an epoxy resin composition is placed thereon. Are densely laminated.

Thereafter, the whole is heated and cured in an oven for a predetermined period of time, and then cooled and cooled to solidify each part, thereby completing a fiber reinforced composite material pressure vessel. Needless to say, filament winding may be performed for those requiring higher strength.

In this case, for example, a thin-film hollow liner made of titanium (inner container) is prepared, and a reinforcing layer such as glass fiber toe or carbon fiber toe impregnated with an epoxy resin composition is provided on the liner (reinforcing). Filament winding is performed by continuously and densely winding the fiber) by hoop winding, helical winding, or the like.

Thereafter, the whole is heated in an oven for a predetermined time and cooled as described above to obtain a composite material pressure vessel.

As described above, the present invention provides a composite material pressure vessel in which a phenoxy resin or other resin is interposed between a metal liner or a non-metallic liner and a composite material layer.
It is an object of the present invention to prevent gaps and slippage between layers generated when a pressure load is applied and to increase the breakdown pressure.

The present invention can be used not only for special purposes such as space use but also for consumer use such as NGV. Further, the present invention can be applied to a container having a larger structure.

[Experimental Example] A resin having excellent adhesion and large elongation interposed between the above-mentioned layers of the composite material pressure vessel is defined as:
As a result of applying the phenoxy resin blended in the tow prep, it was possible to obtain predetermined strength results.

Example 1 A phenoxy resin / MEK solution is applied on a titanium liner and dried. On top of that, a carbon fiber tu (T8) impregnated with an epoxy resin composition
00H manufactured by Toray Co., Ltd.). Thereafter, the mixture was heated and cured in an oven at 180 ° C. for 3 hours to obtain a composite pressure vessel of the example (specimen A).

Comparative Example 1 A composite pressure vessel of a comparative example was obtained by removing the step of applying a phenoxy resin / MEK solution from the above-mentioned production method (sample B).

[Result Characteristics] In the test sample A, 439 (kgf /
cm ＾ 2) burst pressure was obtained. In specimen B, 370
(Kgf / cm ＾ 2).

[0026]

As described above, according to the method of the present invention, it is possible to provide a lightweight composite pressure vessel exhibiting a burst pressure for industrial or consumer use.

Claims (5)

[Claims] 1. A composite material pressure vessel having a resin layer interposed between an inner liner and an FRP. 2. The composite material pressure vessel according to claim 1, wherein the resin layer is a thermoplastic resin layer having excellent adhesiveness and large elongation. 3. A composite material pressure vessel in which a thermoplastic resin layer having excellent adhesion and high elongation is interposed between the inner liner and the FRP, and the filament is wound by a towpreg. 4. The composite pressure vessel according to claim 1, wherein the inner liner is a metal inner liner. 5. A method for manufacturing a composite material pressure vessel in which a resin layer is interposed between an inner liner and an FRP.