JPH06285942A - Reinforced extrusion molded object - Google Patents

Abstract

PURPOSE:To obtain a reinforced extrusion molded object low in the coefficient of linear expansion, having high rigidity, easy in secondary processing and reutilizable as a fiber reinforcing material by coating a reinforcing fiber core material with low foam base material. CONSTITUTION:A reinforced extrusion molded object 1 is produced by a method wherein a reinforcing fiber core material 2 inserted from an insertion port 4 using a crosshead die and extruded from an extrusion port through a tail 7, a holder 8 and a torpedo head 9 and a low foam base material 3 is injected from an injection port 5 to be subjected to co-extrusion molding from the extrusion port 6 in such a state that the core material is coated with the base material to integrate both materials. In this case, it is pref. to preliminarily coat the core material 2 with a resin showing good compatibility with respect to the low foam base material. This reinforced extrusion molded object is low in the coefficient of linear expansion, has high rigidity and facilitates secondary processing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reinforced extruded product which has a small coefficient of linear expansion and a high rigidity, is easily subjected to secondary processing, and can be easily reused as a fiber reinforced material or the like.

[0002]

2. Description of the Related Art As a method for lowering the linear expansion coefficient of an extruded product and improving its rigidity, a powdery or fibrous inorganic filler (for example, glass fiber, mica, talc, wollastonite, asbestos) is used as a base material. , Sepiolite,
A method of extruding a mixture containing slag fiber, zonolite, potassium titanate, elestadite, gypsum fiber, metal fiber, etc., needle-shaped crystal filler, wood powder, etc. is conventionally known, but the expansion ratio is 1 When using a low foaming material of 1 to 5 times, when the blending amount of the filler increases,
Not only is impact resistance remarkably lowered, extrusion molding becomes impossible, but also the reinforcing effect is limited, and there is a problem in that the cylinder and screw of the extruder are damaged.

As a solution to such a problem, a method of insert extrusion molding a metal plate or metal foil and a low-foam material has been proposed (see, for example, JP-A-61-221437). However, the reinforced extrusion molded product obtained by this method has a problem that not only a special metal tool is required for the secondary processing but also it is very difficult to reuse.

[0004]

SUMMARY OF THE INVENTION The present invention solves the above problems, has a small coefficient of linear expansion and high rigidity, and is not only easy for secondary processing but also easily reusable as a fiber reinforced material or the like. It is made to provide a reinforced extruded product.

[0005]

That is, the present invention relates to a reinforced extrusion molded article obtained by coating a reinforcing fiber core material with a low foaming base material.

The present invention will be described below with reference to the accompanying drawings. FIG. 1 is a schematic front view showing one embodiment of a mold suitable for producing a reinforced extrusion molded article according to the present invention. FIG. 2 is a schematic cross-sectional view taken along the line AA of FIG. FIG. 3 is a schematic perspective view of a reinforced extrusion molded body produced by insert extrusion molding using the mold shown in FIGS. 1 and 2. FIG. 4 is a schematic perspective view of a reinforced extrusion molded body having a corrugated cross-sectional shape of a reinforcing fiber core material. FIG. 5 is a schematic perspective view of a reinforced extrusion molded product in which the cross-sectional shape of the reinforcing fiber core material is zigzag. FIG. 6 is a schematic perspective view of a reinforced extrusion molded body having a reinforced fiber core material in a divided mode. FIG. 7 is a schematic perspective view showing a modification of FIG. FIG. 8 is a schematic perspective view of a reinforced extrusion molded body having a plurality of reinforcing fiber core materials embedded in a laminated shape. FIG. 9 is a schematic perspective view of a reinforced extrusion molded body in which a plurality of FRP rods are embedded.

The reinforced extruded product (1) according to the present invention is constituted by coating a reinforcing fiber core material (2) with a low foaming base material (3).

Examples of materials for the reinforcing fiber core material (2) include various carbon fibers, glass fibers and aramid fibers. Further, the form of the fiber core material (2) includes a woven fabric, a knitted fabric, which is composed of one or more types of fibers of this type,
Nonwoven fabrics, nets and tapes are exemplified.

As the low-foaming base material (3), a foaming ratio of 1.1 to 5.0, which is obtained by mixing an appropriate foaming agent with a resin which has been widely used as a base material for an extruded body such as a building board, has been used. Double
It is preferable to appropriately use those having a content of 2.0 to 3.0 times. As this kind of resin, polyvinyl chloride resin, polyethylene resin, polypropylene resin, polystyrene resin,
Examples thereof include styrene-acrylonitrile-butadiene terpolymer and polycarbonate resin, and examples of the foaming agent include sodium bicarbonate, azodicarbonamide and p, p'-oxy-bis (benzenesulfonylhydrazide).

The reinforced extruded product (1) according to the present invention is shown in FIG.
Using a crosshead die as shown in FIG. 2, a reinforcing fiber core material (2) is inserted from the insertion opening (4), and the core material is tail (7), holder (8) and torpedo head (9). ) Through the extrusion port (6) and at the same time, the low foaming base material (3) is injected through the injection port (5), and the base material is passed through the extrusion port (6) and the core material It is manufactured by coextrusion molding in a coated state and integrating both. in this case,
Since the core material (2) is usually flexible, when the core material (2) is inserted into the mold, an appropriate tension is applied.
Is a resin that shows good compatibility with the low-foaming base material (3) before being inserted into a mold, for example, when a polyvinyl chloride resin is used as the low-foaming base material (3), vinyl chloride-urethane From the viewpoint of improving the adhesiveness between the reinforcing fiber core material and the low-foaming base material, it is preferable to coat it with a copolymer resin and then preheat (for example, 100 to 200 ° C.).

The cross-sectional shape of the reinforcing fiber core material (2) can be appropriately selected according to the size and shape of the reinforced extrusion molded body (1) and the intended use. For example, the cross-sectional shapes shown in FIGS. Core material shown in FIGS. 4 and 5
The cross-sectional shape of (2) is wavy and zigzag, respectively.
The strength of the molded product (1) can be increased more than in the case of the embodiment shown in FIG. The width of the molded body (1) is, for example, 100 m
If it is more than m, depending on the mode shown in FIG. 3, the core material (2)
Since the slit through which the core passes is bent by the resin pressure in the mold, it becomes difficult to insert the core material (2) into the mold. In this case, it is preferable to divide the core material (2) as shown in FIG. 6, and the linear expansion coefficient, the secondary shrinkage ratio and the formability of the molded body according to this embodiment are different from those of the embodiment shown in FIG. There is no inferiority. When the width of the molded body (1) is 100 mm or more and the thickness is 10 mm or less, under the condition that the total width of the split core materials (2) is 50% or more of half of the peripheral length of the molded body. It is preferable to insert the core material into the mold from the viewpoint of reducing the linear expansion coefficient and the secondary shrinkage ratio. In the case of the embodiment shown in FIG. 6, different kinds of core materials, for example, glass cloth and steel paper or glass cloth and carbon fiber cloth can be inserted. It is possible to appropriately reinforce the degree.

However, in the case of the embodiment shown in FIG. 6, since the unreinforced portion is formed between the core materials (2), there is a drawback that the Charpy impact value of the unreinforced portion is lowered. The drawback is that, as shown in FIG.
It is solved by overlapping in two layers near the center of (1). The width of the two-layer portion is usually about 5 to 10 mm from the viewpoint of physical properties of the molded product and cost.
In this case, the thickness of the two-layer molded body (1) may be 20 to 50% thicker than the peripheral thickness.

When the thickness of the molded body (1) is 10 mm or more, it becomes difficult to reduce the linear expansion coefficient of the molded body depending on the mode shown in FIG. 3, so as shown in FIG.
It is preferable to insert a plurality of core materials (2) in a laminated form, whereby the linear expansion coefficient of the molded body (1) can be lowered and the mechanical strength can be increased.

Further, in order to improve the bending-related characteristics of the molded body, such as bending stress, bending Young's modulus and maximum deflection amount, the core material (2) is formed as shown in FIG. It is preferable to arrange a plurality of FRP rods. As shown in FIG. 9, the arrangement pattern of the FRP rod is generally linear, but it is also possible to increase the reinforcing efficiency easily by forming it in an alternating zigzag pattern. The embodiment shown in FIG. 9 is particularly effective for a molded body having a complicated shape, and the rib portion of the molded body can be easily reinforced. In addition, the bending-related properties of an extruded product C having the same form as those of the extruded products A and B of the embodiment shown in FIGS. 3 and 9 and the core excluding the core material are shown in the following table. Shown in 1. In this case, the thick parts of the molded products A to C have a thickness of 10 mm, the other parts have a thickness of 13 mm, the rib length is 20 mm, and the molded product has a width of 80 mm.
mm, and the thickness and width of the core material (glass fiber cloth) of the molded body A are 0.6 mm and 60 mm, respectively.
The diameter and the number of insertion of the core material (glass fiber reinforced unsaturated polyester rod) of the molded body B are 1.8 mm and 30 respectively, and the low foaming base material has a foaming ratio of 1.5 to 2.
5 is a polyvinyl chloride resin.

[0015]

[Table 1]

If desired, a weather-resistant resin compatible with the low-foaming base material (3), for example, when a polyvinyl chloride resin is used as the low-foaming base material, a methacrylic resin or a methacrylic resin is used as the surface layer resin. Low foaming base material such as butyl acrylate copolymer, styrene-methacryl copolymer, styrene-acrylonitrile-acrylic rubber resin
According to the present invention, the reinforcing fiber core material (2) and the low-foaming base material (3) are simultaneously extruded together with the weather resistant resin in a state where the whole surface or a part of (3) is covered. The weather resistance of the reinforced extrusion molded article (1) may be improved. further,
The whole or a part of the surface of the low foaming base material (3) or the whole or a part of the surface of the weather resistant resin layer may be decorated with a desired flow pattern by simultaneous molding.

The cross-sectional shape of the reinforced extruded product (1) according to the present invention, that is, the cross-sectional shape of the extrusion port (6) is not particularly limited.
It may be appropriately selected according to the purpose of use.

The reinforced extrusion-molded product (1) according to the present invention is constructed by embedding the reinforcing fiber core material (2), which is relatively easy to pulverize, in the low-foaming base material (3) so as to be embedded therein. When it is discarded, the molded body can be reused as a fiber-reinforced material useful as a raw material for various molded bodies by subjecting the molded body to pulverization as it is.

[0019]

EXAMPLES The present invention will be further described below with reference to examples. Example 1 Using the mold shown in FIGS. 1 and 2, a reinforced extrusion molded product having a form as shown in FIG. 3 was manufactured. in this case,
As the reinforcing fiber core material (2), a glass fiber cloth (roving cloth) [Unitika Yumegrass Co., Ltd. “N660D104”] surface-treated with a vinyl chloride-urethane copolymer resin emulsion is used, Immediately before the glass fiber cloth is inserted through the insertion port (4), it is preheated with an infrared heater or a hot air heater so that the surface temperature is 150 to 170 ° C. Tension (10k
g to 20 kg / 45 mm width) was applied. Further, as the low foaming base material (3), sodium bicarbonate was used as a foaming agent in 3.
Polyvinyl chloride resin containing 0 parts by weight (degree of polymerization: 700)
And a 45 m / m conical twin extruder was used as the extruder. The glass fiber cloth transfer speed and the polyvinyl chloride resin supply speed were 1.0 m each.
/ Min and 1.1 to 1.2 m / min. Depending on the above manufacturing conditions, the expansion ratio is 2.3 to 2.8 and the specific gravity is 0.50 to
0.60 and linear expansion coefficient 2.0 to 2.5 × 10 ^-5 1 /
℃ (extruded body of the same material without inserting glass fiber cloth
The linear expansion coefficient of (hereinafter referred to as unreinforced product) is 5.0 to 5.5.
A reinforced extrudate having a value of × 10 ⁻⁵ 1 / ° C.) was obtained. Also, its Charpy impact strength (without notch) (J
IS K 7111) was 40 to 50 kg · cm / cm ² , which was 2.0 to 2.5 times stronger than the unreinforced product. In addition, the secondary shrinkage (the strain due to the tensile stress during molding remains in the extruded product, and the strain is relaxed by repeated heating and cooling, which generally shortens the length. The shrinkage ratio was 0.02 to 0.03%, which was about 1/10 of that of the unreinforced product. This extruded product is useful as an interior / exterior material for construction, an exterior material, a civil engineering material, and the like. In the above production method, the glass fiber cloth pre-surface-treated with the surface treatment agent was used as the reinforcing fiber core material, but the surface-untreated cloth-shaped or tape-shaped reinforcing fiber core material was extruded. In the previous process,
It may be continuously passed through the surface treatment agent bath, then passed through the hot air dryer and then fed to the extrusion die.

[0020]

INDUSTRIAL APPLICABILITY The reinforced extrusion molded article according to the present invention has a small linear expansion coefficient, high rigidity, and easy secondary processing. Therefore, in various fields, for example, building boards, civil engineering materials, landscape materials, It is a molded product that can be used as a water treatment material, vehicle material, transportation material (pallet, etc.), etc. Furthermore, since the molded product can minimize its secondary shrinkage,
In particular, it can be used outdoors and can be used as a building board that does not shrink even when the temperature difference between day and night is repeatedly applied. Further, the reinforced extruded body which has become unnecessary is not disposed of as waste causing environmental pollution, and is subjected to a simple processing such as crushing, for example, a fiber reinforced material useful as a raw material for various molded bodies. It can be reused as, etc., and can meet the request for effective use of resources.

[Brief description of drawings]

FIG. 1 is a schematic front view showing one embodiment of a mold suitable for producing a reinforced extrusion molded article according to the present invention.

FIG. 2 is a schematic cross-sectional view taken along the line AA of FIG.

FIG. 3 is a schematic perspective view of a reinforced extrusion molded article manufactured by insert extrusion molding using the mold shown in FIGS. 1 and 2.

FIG. 4 is a schematic perspective view of a reinforced extrusion molded body having a corrugated cross-sectional shape of a reinforcing fiber core material.

FIG. 5 is a schematic perspective view of a reinforced extrusion molded product in which the cross-sectional shape of the reinforcing fiber core material is zigzag.

FIG. 6 is a schematic perspective view of a reinforced extrusion molded body having a reinforced fiber core material in a divided mode.

FIG. 7 is a schematic perspective view showing a modification of FIG.

FIG. 8 is a schematic perspective view of a reinforced extrusion molded body having a plurality of reinforcing fiber core materials embedded in a laminated form.

FIG. 9 is a schematic perspective view of a reinforced extrusion molded body in which a plurality of FRP rods are embedded.

[Explanation of symbols]

 1 Reinforced Extruded Body 2 Reinforced Fiber Core Material 3 Low Foam Base Material 4 Insertion Port 5 Injection Port 6 Extrusion Port 7 Tail 8 Holder 9 Torpedo Head

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification number Internal reference number FI technical display location B29K 105: 06 (72) Inventor Sadafumi Morimatsu 2-4-31 Hisaroro, Chuo-ku, Osaka, Osaka Kurashiki Spinning Co., Ltd.Osaka Head Office (72) Inventor Hiroshi Kishino 2-4-31, Kutaro-cho, Chuo-ku, Osaka City, Osaka Prefecture Kurashiki Spinning Co., Ltd. Osaka Head Office (72) Inventor Takayuki Hirayama 2-Kutaro-cho, Chuo-ku, Osaka City, Osaka Prefecture 4-31 Kurashiki Spinning Co., Ltd. Osaka Head Office

Claims (3)

[Claims] 1. A reinforced extrusion molded article obtained by coating a reinforcing fiber core material with a low-foaming base material. 2. A reinforced extrusion molded product obtained by coating the whole or a part of the surface of the molded product according to claim 1 with a weather resistant resin. 3. The reinforced extrusion-molded product according to claim 1, wherein the entire surface or a part of the surface of the molded product is decorated with a flow pattern.