JP3129606B2 - Composite molding - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composite molded article comprising a metal plate and a high-strength fiber-reinforced plastic (hereinafter, referred to as ACM) when a high-speed flying object is received from the side of the metal plate. The present invention relates to a composite molded article having excellent impact resistance to high-speed flying objects by wrapping the composite molded article in ACM so that plastic does not peel off from a metal plate.

[0002]

2. Description of the Related Art A shock-resistant body against an object falling from a high place or flying at a high speed is a chemical method such as bonding an ACM to the back surface of a single or alloy of iron, titanium, or aluminum, or a mechanical method using a bolt / nut. Japanese Patent Application Laid-Open No. 3-58835 discloses a technique for improving the weight and impact resistance by fixing
No. 58837 discloses this. However, when the impact force is considerably strong, or when the impact force is applied several times or more, peeling between the metal plate and the ACM occurs,
A phenomenon in which the swelling of M on the rear surface becomes large has occurred, and it has been required to improve these points.

[0003]

SUMMARY OF THE INVENTION The present inventors have found that by fixing ACM to the back surface of a metal plate (body), it is possible to obtain a composite molded article having light weight and excellent impact resistance.
Furthermore, as a result of various investigations to improve the impact resistance, the metal / ACM composite molded product is completely wrapped in the ACM to eliminate the separation between the metal and the ACM, and to greatly reduce the bulge on the back surface of the ACM. This has led to the completion of a composite molded article having excellent impact resistance.

[0004]

According to the present invention, a metal plate and an AC
The present invention relates to a composite molded product made of M, wherein a composite molded product obtained by laminating a metal plate and ACM is wrapped in ACM. The metal plate used here may be any material such as iron, aluminum, titanium or the like alone or in the form of an alloy.

On the other hand, high strength fibers used as ACM have a specific tensile strength of 10 × 10 which is obtained by dividing tensile strength by density.
^The specific elastic modulus obtained by dividing the elastic modulus by the density is 2.5 × 10 ⁸ cm or more. Specifically, high-strength glass fiber, carbon fiber, aramid fiber, aromatic polyester fiber, high-strength polyethylene fiber, high-strength nylon fiber, and the like. General glass fiber, nylon fiber, polyester fiber, etc. are not applicable. When fibers having a specific tensile strength or a specific elastic modulus of not more than the above values are used, the impact resistance of the composite molded product is not always sufficient.

On the other hand, resins that are impregnated, coated or superposed on these high-strength fibers include phenol resins, epoxy resins, polyurethane resins, unsaturated polyester resins, vinyl ester resins, and polyimide resins as thermosetting resins. Examples of thermoplastic resins include polyolefins such as polyethylene and polypropylene, polyamides, polyesters, polyvinyl acetate, polyether sulfide, polyphenyl sulfide, polyether ether ketone, and the like. Synthetic rubber or elastomer such as styrene (AS) resin and neoprene.

In order to obtain ACM, in the case of a thermosetting resin,
A prepreg is prepared by impregnating or coating a high-strength fiber with a thermosetting resin, and a plurality of prepregs are stacked and heated or pressed. Resin content is 5-80%
(% By weight, the same applies hereinafter), but usually 5 to 50
%, Preferably 8 to 30%. On the other hand, in the case of a thermoplastic resin, a high-strength fiber and a sheet-shaped material such as a thermoplastic resin film or a woven fabric are alternately laminated and heated and pressed, or a compression molding method in which the resin is melted in advance, and the resin is melted in advance. There is also a method of adhering to a high-strength fiber. The content of the thermoplastic resin is the same as that of the thermosetting resin.

As a method of fixing the ACM obtained by the above method to the back surface of the metal plate, a mechanical method using bolts, rivets or the like, a frame material or the like, or a synthetic rubber or epoxy resin or the like is used. There is a chemical method of bonding with an adhesive. At the time of fixing, a space may be provided between the metal plate.

In the present invention, in order to further improve the impact resistance of the composite molded article thus produced, the composite molded article is wrapped in ACM. Specifically, the composite molded body is wrapped with a prepreg obtained from the high-strength fiber and resin used for the composite molded body or another high-strength fiber and resin having good adhesion to the composite molded body, and heated and pressed. Method of molding while wrapping the composite molded body by the hand lay-up method, or method of alternately wrapping a thermoplastic resin sheet and high-strength fiber, heating and melting, and pressing, or a method in which a thermoplastic resin is attached There is a method in which a composite molded body is wrapped with a strength fiber and heated and pressed. The resin content is preferably slightly higher than that of the composite molded body. That is, in the range of 10 to 80%,
Usually, it is 15 to 70%, preferably 20 to 60%. The number of layers when wrapping is 1 to 30 layers, usually 1 to 20 layers,
It is preferably 2 to 15 layers.

[0010] In the case of a composite molded article not wrapped in ACM, when a large impact force or a high-speed flying object collides and an impact object enters the composite molded article due to the impact force, a large bulge occurs on the back surface. However, the composite molded article wrapped with the ACM obtained as described above has a significantly reduced swelling due to the mutual tensile effect of the ACM of the jacket. Further, in the case of a thin composite molded product, penetration or delamination of a metal plate / ACM may occur for a small high-speed flying object, but it is possible to suppress the penetration and delamination by wrapping in an ACM. .

[0011]

【Example】

Example 1 A resole-type phenolic resin was added to a plain woven fabric (basis weight: 300 g / m ² ) made of high-strength glass fiber having a specific tensile strength of 16 × 10 ⁶ cm and a specific elastic modulus of 3.2 × 10 ⁸ cm. It was impregnated and dried to obtain a prepreg having a resin content of about 20%. Stack 6 prepregs at 150 ° C, 100kg
/ Cm ² to obtain an ACM plate. This ACM
The plate was fixed to a high-tensile steel plate (4 mm thick) with bolts and nuts to obtain a composite molded body A shown in FIG. The prepreg was heated at about 80 ° C., wound around the composite molded article A three times, placed in a mold, and heated and pressed under the same molding conditions to obtain a composite molded article B shown in FIG.

Example 2 Specific tensile strength is 29 × 10 ⁶ c
Bisphenol A type epoxy resin is coated on the surface of a woven fabric (basis weight: 350 g / m ² ) made of high-strength polyethylene fiber having a specific elastic modulus of 10 × 10 ⁸ cm and dried to prepare a prepreg having a resin content of about 25%. I got Ten prepregs were stacked and heated and pressed at 110 ° C. and 50 kg / cm ² to obtain an ACM plate. The ACM plate was bonded to a titanium alloy (4 mm thick) with an epoxy resin to obtain a composite molded body C. The composite molded article C was wound twice by hand lay-up molding using the above-mentioned polyethylene woven fabric and vinyl ester resin and cured at room temperature to obtain a composite molded article D.

Example 3 Specific tensile strength is 21 × 10 ⁶ c
m, aramid fiber woven fabric having a specific elastic modulus of 6.4 × 10 ⁸ cm (basis weight: 450 g / m ² ) and 18% ME of ABS resin
The K solution was impregnated and dried to obtain a prepreg having a resin content of about 20%. Four layers of this prepreg are stacked at 150 ° C and 100k
An ACM plate was obtained by heating and pressing at g / cm ² . This ACM
The plate was bonded to an aluminum alloy (thickness: 6 mm) with a synthetic rubber adhesive to obtain a composite molded body E. The aramid woven fabric prepreg was wound twice around the composite molded article E, placed in a vacuum press, and heated and pressed to obtain a composite molded article F.

Example 4 Specific tensile strength 20 × 10 ⁶ c
m, a woven fabric of aromatic polyester fibers having a specific elastic modulus of 4.9 × 10 ⁸ cm (basis weight: 260 g / m ² ) and seven highly stretched polyethylene films (thickness: 100 μm) are alternately laminated. Heating at 130 ° C. and 70 kg / cm ²
Pressure was applied to obtain an ACM plate (both surfaces were polyethylene films). This ACM plate is placed on a stainless steel plate (thickness: 3 mm).
It was fixed with rivets at a pitch of 50 cm to obtain a composite molded body G. After laminating the above-mentioned polyethylene film and polyester woven fabric three times on this composite molded product G and heating and pressing it under the same conditions as above, a composite molded product H was obtained.

Example 5 Specific tensile strength is 32 × 10 ⁶ c
m, unidirectional nonwoven (basis weight: 130g / m ²⁾ made of a high strength polyethylene fibers of the specific modulus 12 × 18 ⁸ cm polyurethane-modified vinyl ester resin was applied to the surface, the dried resin content of about 30% I got a prepreg.
10 prepregs are alternately stacked in the orthogonal direction,
An ACM plate was obtained by heating and pressing at 60 ° C./° C. and 60 kg / cm ² . This ACM plate was bonded to a titanium plate (thickness: 5 mm) with a urethane-based adhesive to obtain a composite molded product I. The composite molded article I is coated with the high-tensile-high-elasticity carbon woven fabric (basis weight: about 20
0 g / m ² ) and the same resin as above and wound four times by hand lay-up molding to obtain a composite molded article J after curing.

Comparative Example 1 Nine prepregs obtained in Example 1 and three prepregs obtained by Example 1 were separately heated and pressed at 150 ° C. and 100 kg / cm ² to obtain two kinds of ACM plates. I got Next, the above-mentioned nine-ply ACM was fixed on the back surface of the same high-tensile steel plate (thickness: 4 mm) as in Example 1, and the three-ply ACM was fixed on the front surface with bolts and nuts, respectively. K was obtained.

Comparative Example 2 Twelve prepregs obtained in Example 2 and two prepregs obtained in Example 2 were separately heated and pressed under the same conditions as in Example 2 to form two types of ACM plates. Obtained. 1 on the back of titanium alloy (4mm thick)
The two-layered ACM was bonded to the surface with the two-layered ACM using an epoxy resin to obtain a composite molded product L.

Comparative Example 3 Six prepregs obtained in Example 3 and two prepregs obtained in Example 3 were separately heated and pressed under the same conditions as in Example 3 to obtain two types of AC.
An M plate was obtained. A composite A was obtained by adhering six ACMs on the back surface of the aluminum alloy (6 mm thick) and two ACMs on the front surface with a synthetic rubber adhesive.

Comparative Example 4 Ten high-stretched polyethylene films (thickness: 100 μm) and nine polyester woven fabrics alternately superposed in Example 4 and three polyethylene films and three polyester woven fabrics Were alternately heated and pressed separately under the same conditions as in Example 4 to obtain two types of ACM plates. 9 A polyester woven fabric on the back of a stainless steel plate (thickness 3 mm)
The CM and three ACMs were fixed on the surface with rivets at a pitch of 150 cm, respectively, to obtain a composite molded product N.

{Comparative Example 5} A obtained in Example 5
ACM hand-lay-up molded on a CM plate using four carbon woven fabrics and the same resin as in the example was used on the back of a titanium plate (thickness: 5 mm), and only four carbon woven fabrics on the front surface using the resin. The hand lay-up molded ACM plate was bonded with a urethane-based adhesive to obtain a composite molded product P. The composite molded article was subjected to a penetration impact resistance test at a speed of about 850 m / sec using 1.1 g bullets in accordance with MIL-STD-662. Table 1 shows the results.

[0021]

[Table 1]

[0022]

As is clear from the above results, the composite molded article of the present invention is excellent in impact resistance, has a small swelling on the back of the molded article after the impact test, and does not cause peeling of the ACM plate and the metal plate.

[Brief description of the drawings]

FIG. 1 is a schematic cross-sectional view of a composite molded body A in Example 1.

FIG. 2 is a schematic sectional view of a composite molded product B in Example 1.

FIG. 3 is a schematic cross-sectional view of a composite molded product K in Comparative Example 1.

[Explanation of symbols]

 1 Metal plate 2,3 ACM 4 Metal plate 5,6 ACM

Claims (1)

(57) [Claims] 1. A composite molding comprising a metal plate and a high-strength fiber-reinforced plastic, wherein a composite molding formed by laminating the metal plate and the high-strength fiber-reinforced plastic is wrapped with the high-strength fiber-reinforced plastic. Composite moldings.