JPH0232840A - Composite reinforced plastic prepared by laminating air-tight reinforcing material - Google Patents

Abstract

PURPOSE:To improve such characteristics as toughness, interlaminar peeling and anisotropic shrinkage at higher temp. of a composite reinforced plastic laminate by using an air-tight metal foil or metal or plastic film- or sheet-like flat sheet wherein a number of small holes are perforated in such a way that rate of opening is in a specified range. CONSTITUTION:As a reinforcing material, an air-tight foil or a thin sheet with a thickness of 0.5mm or thinner of aluminum, iron, stainless steel or copper or a plastic film or sheet is used. An ordinary punching process can be used for perforation, but a process using an electron beam or a laser ray is pref. for the metal foil. As the hole diameter, in case of a commercially available metal sheet with a hole diameter of 0.5mm (the rate of opening is 35% or higher), pressurizing is needed for passing a resin soln. and if the hole diameter is too large, the resin side for reinforcement is too emphasized. As the result, a hole diameter of 3.0mm or smaller is suitable. The rate of opening has a positive correlation with the characteristics of a reinforcing material and it is pref. that the rate of opening is set in the range of 1.0-20%. A plastic for reinforcement thereby penetrates the upper and lower sides of reinforcing material and has a three dimensional structure and a tough composite plastic can be obtd.

Description

DETAILED DESCRIPTION OF THE INVENTION A. Field of Industrial Application The present invention relates to the field of tape-like and plate-like reinforced plastics used for vehicles, aircraft and other structural materials, electromagnetic shielding materials for electronic devices, circuit boards, and other members. It is related to.

Therefore, it is unsuitable as an injection molding material.

P Conventional technology Reinforced plastic materials are manufactured by impregnating various plastics with glass fiber, carbon fiber, ceramic materials, metal fibers, metal coated fibers, etc. as reinforcing materials. The delamination (interlaminar fracture toughness) is said to be poor, and fiber-based reinforced plastics have a high temperature (150
However, the cost remains high due to the problem of anisotropic shrinkage at temperatures above ℃ (continuous use).

C. Problems to be solved by the invention The invention aims to improve properties such as toughness, delamination, and anisotropic shrinkage at high temperatures, which are disadvantages of composite reinforced plastic laminates, and molds lightweight and strong composite plastics. There is a particular thing. In particular, there is a demand for replacing expensive carbon fibers, metal fibers, ceramic materials, etc. with inexpensive materials as reinforcing materials. This is what I pursued.

Normally, rope-like materials have air permeability and permeability, so the porosity is 3.
It is common knowledge that the properties of the material that makes up the rope, such as tensile strength, elongation, and flexural modulus, change significantly because it is more than 0%, and that some properties deteriorate by a factor of 50 or more. Therefore, a large reinforcing effect is achieved by forming small holes in a range where the characteristic values of the material of this rope-like material do not deteriorate to a level below that of Kano. That is, by punching small holes of 3.9 m or less in the reinforcing material so that the pore area per area is 20 or less, the reinforcing plastic penetrates the upper and lower parts of the reinforcing material and has a three-dimensional structure. As a result, strong composite plastics can be obtained.

E. Effects of the present invention Since the inner structure of the laminate is formed into a rope-like or lug-like structure by reinforcing plastics through the small holes of the reinforcing material, the difference in expansion and contraction strain of each laminate material acts independently on the small sections, so the total The expansion and contraction distortion of can be minimized. Furthermore, since the reinforcing plastic and the reinforcing material are in a pinned state, the tensile strength of the reinforced plastic is added to increase the adhesive strength. Furthermore, since the deterioration of the characteristic values of the reinforcing material is kept as low as possible, properties closer to metal performance can be obtained than when a metallic material is used as the reinforcing material. And expensive carbon
Compared to the case of using fibers made of metal or ceramic materials, the cost is essentially 1/10 or more rationalized.

Description of the present invention As a reinforcing material, an airtight foil of aluminum, iron, stainless steel, copper, etc., a thin plate with a thickness of 0.5 or less, or a plastic film or sheet is used, and reinforcing plastics are used. Depending on the combination with the base, the corresponding form can be changed. That is, for metal materials having heat resistance of 500° C. or higher, any thermosetting or thermoplastic resins can be used as reinforcing plastics. When using plastics as reinforcing materials whose heat resistance is lower than Class 4 metal, it is necessary to select the type of reinforcing plastic depending on the heat resistance of the reinforcing plastic. In other words, for reinforcing plastics that have a heat resistance of around 200°C, the temperature ranges from room temperature to 10°C.
For example, a thermosetting resin or a polycondensable resin that can be impregnated at 0° C. or lower is used.

Therefore, as reinforcing materials for plastics, 111 resins such as polyamide/imide, polyimide, polyether AI, polyphenylene 0 oxide, polyphenylene sulfide, polyacetal, and polycarbonate, which correspond to the bath meltability of reinforcing plastics, are used. Furthermore, as the reinforcing plastics, suitable combinations of thermoplastic resins including polyolefin-based styrene-based resins, thermosetting resins, and polycondensation resins can be used.

A conventional punching method may be used as the hole punching method, but methods using electron beams or laser beams are superior in cases where hole punching is required under no pressure, such as in metal foils. The hole diameter is 0.5m by the punch method (open area ratio of 35 or more)
Metal plates with a diameter of 3 are on the market, but with this hole diameter, pressure is required for the resin liquid to pass through, and if the hole diameter becomes large, the reinforcing resin surface will be too emphasized, so the hole diameter of 3 is used.
．． A value of 0■ or less is appropriate. The porosity has a positive correlation with the properties of the reinforcing material, and it is estimated that a 20% decrease in the characteristic value is approximately 2096 or less in the porosity, so it is desirable to set it within this range.

Example (1) A commercially available two-component room-temperature curing epoxy resin for metal bonding was used as the reinforcing plastic. Cut out a 10 cd piece of commercially available aluminum plate (0.1 m) as a reinforcing material 3
Two pieces of paper were prepared, stacked on top of each other, and a 1'w graph paper was placed on top of the paper, dots were dotted at intervals of 5.0+ m to determine the position for drilling, and 2 small holes were drilled using a drill. The porosity in this case was approximately 12.5 inches. Apply the epoxy mixture to one side of the aluminum foil 2
I also coated the second sheet of aluminum foil with epoxy resin and stacked the two sheets together. Repeat the same process for the third sheet. 1. Finally, apply epoxy resin to both the front and back sides, place it on a Teflon sheet, and apply 4. ?
The fluorocarbon sheets were stacked and lightly pressed to complete the reaction and a 7-layer laminate with a thickness of 0.9 m was obtained.

The cross section of the product was confirmed to have a three-dimensional structure with epoxy resin as pillars using a looper. Comparison products without hole punching were made using the same method, and the one with a thickness of 0.75 m showed peeling from the aluminum plate as early as the second time, but the one due to its nature did not peel more than four times.Furthermore, it was tested with ceramic scissors. When a piece is cut to a width of about 5 m, the aluminum plate of the 5-cm-wide product in question peels off, but with the original product, interlayer peeling occurs. ! ! I was able to confirm this by doing some simple things.

Example (2) Fine powder of thermoplastic nylon 6 (melting point: 225° C.) was used as the reinforcing plastic.

Example using an aluminum plate (0.1wm) as a reinforcing material (
According to 1), two sheets were prepared, but in this case, 1.5 at 5 ■ intervals.
The holes were drilled with a hole diameter of ms. The open area ratio was approximately 7. Spread a thin layer of nylon 6 powder on a Teflon sheet (approximately 1.0
m) Place a spread aluminum plate, spread nylon 6 powder on top of it in the same way, and then layer the aluminum plate again.Finally, spread nylon 6 thinly and press it lightly with a Teflon sheet to form it.
Place the iron plate No. 1 in the heating furnace and raise the furnace temperature to 220℃.
After about 2 minutes, heating was stopped and the mixture was gradually cooled. Approximately 2 thick, consisting of 5 layers
．． A laminate product of 50% was obtained.

In the cross section of the product, a three-dimensional structure with nylon 6 resin as pillars was confirmed using a looper, but there were some air bubbles. Industrially, it is naturally necessary to consider defoaming treatment.

Example (3) The commercially available epoxy resin of Example (1) was used as the reinforcing plastic. As a reinforcing material ″″c25μmc25μm
According to Example (1) using polyimide, three sheets were made with a pore size of 2.5-
Holes were drilled at intervals of 5.0 m. The open area ratio was about 15.7%. An epoxy resin was applied onto the prepared polyimide film to obtain a 7-layer laminate with a thickness of about 0.7 m according to Example (1).

The cross section of the product was confirmed to have a three-dimensional structure with epoxy resin as pillars using a looper.

Claims (2)

[Claims] (1) When manufacturing a laminate using thermosetting or thermoplastic resin (hereinafter referred to as reinforcing plastics) using an airtight metal foil or metal film/sheet-like flat plate as the reinforcing material, many The opening rate of small holes (3.0 mm or less) is 1.
．． Reinforced composite plastics that forms a three-dimensional mesh shape through reinforcing plastics by drilling the holes to 0 to 20%. (2) A composite reinforced plastic that constitutes a three-dimensional mesh shape by using a plastic as a reinforcing material and a thermosetting resin as a reinforcing plastic as described in the preceding item 1.