JPH0753426B2 - Continuous molding method of fiber reinforced plastic with embossed pattern - Google Patents

Description

TECHNICAL FIELD The present invention relates to a continuous molding method of a fiber reinforced plastic (hereinafter referred to as FRP) having an embossed pattern formed on its surface.

(Prior Art) Conventionally, an FRP with an embossed pattern is obtained by transferring unevenness to the surface of an FRP plate using a press plate on which an uneven pattern (embossed pattern) is formed during press molding. They are used for lids for decorative panels, municipal wastewater treatment ponds, factory drainage ponds, etc.

In order to improve the production capacity of these, JP-A-56-121735
The publication discloses a method for continuously molding and curing a plate-shaped fiber reinforced plastic. In this method, an endless belt is added to at least one surface in a die hole, and the resin-impregnated base material is pulled out at the same time, an uneven pattern on the endless belt (stainless belt) is transferred, and continuously molded. In this method, in order to make the sliding of the endless belt and the surface of the die hole smooth, lubricating oil is used, rollers are provided on the inner surface of the die hole, and there is a certain amount of contact between the endless belt and the surface of the die hole. Special equipment must be devised such as providing a gap. However, even with such a device, it was very difficult to smoothly and continuously slide.

(Problems to be Solved by the Invention) An object of the present invention is to solve the above-mentioned problems of the prior art and to provide a continuous molding method of a fiber-reinforced plastic having an embossed pattern capable of smoothly and continuously molding. Is.

(Means for Solving the Problems) According to the present invention, a fiber base material is drawn into a die hole, and while running in the die axial direction, a resin is injected into the die to cure while impregnating the fiber base material. In the method of continuous pultrusion molding of fiber reinforced plastics, a peelable sheet material having embossed patterns on the front and back surfaces is continuously or intermittently interposed between the layers of the fiber substrate, and then the peelable sheet material is peeled off. The present invention relates to a continuous molding method of a fiber reinforced plastic having an embossed pattern.

Examples of the resin used in the present invention include thermosetting resins such as unsaturated polyester resins and epoxy resins. These resins are used as a mixture containing a curing catalyst and, if necessary, a low shrinkage agent, a filler, a release agent and a coloring agent.

As the curing catalyst, a general heat curing catalyst is used. For example, benzoyl peroxide, t-butyl perbenzoate, t-butyl peroctoate, dicumyl peroxide, di-t-butyl hydroperoxide,
Examples include Kyumen hydroperoxide. The amount of these used is preferably 0.3 to 3% by weight based on the resin.

The low-shrinking agent is used to reduce the shrinkage of the resin at the time of curing. Generally, a thermoplastic polymer is used, and polystyrene, polyethylene, polypropylene, polymethylmethacrylate, polyvinyl acetate, polyvinyl chloride, or a combination thereof is used. Examples include polymers and saturated polyesters obtained from polyhydric alcohols and polybasic acids. The amount of the low-shrinking agent used is preferably 30% by weight or less based on the resin.

As the filler, inorganic ones such as calcium carbonate, aluminum hydroxide, clay and glass powder are generally used. The amount of these used is 300% by weight based on the resin.
The following are preferred.

As the release agent, zinc stearate or the like is generally used, and its use amount is preferably 1 to 5% by weight based on the resin.

As the colorant, an inorganic or organic pigment, a toner or the like used for coloring the unsaturated polyester resin is used.

As the fiber base material used in the present invention, if it is a fiber base material that can be continuously drawn and formed, glass roving can be used, and glass roving is preferably used, but it is preferable to use sheet-like fiber bases on both sides of a continuous filament group such as glass roving. It is preferable to interpose a material. A glass fiber material is preferably used as the sheet-like fiber base material, and examples thereof include a chopped strand mat, a continuous mat, a roving mat, and a roving cloth. In addition, those obtained by combining and integrating these are also used. Further, a surf pacing mat may be further interposed on the outer surface of the sheet-shaped fiber base material. The surf aging mat may be an inorganic material such as glass or an organic material such as vinylon.

In the present invention, when the FRP has such a fiber structure, the content of the fiber base material in the FRP is preferably 15 to 70% by volume.

As the peelable sheet-like body having embossed patterns formed on the front and back surfaces (hereinafter referred to as peelable sheet-like body) used in the present invention, any material may be used as long as it is a durable peelable sheet-like body. There are products such as stainless steel sheets with an embossed pattern, polyester films and other films with an embossed pattern.

When a stainless steel plate that is repeatedly used is used as the peelable sheet-shaped body, it is preferable to use a polyester film or the like in place of the stainless steel plate at the cutting point in order to prevent the stainless steel plate from being cut. The releasable sheet-like material may be interposed continuously, but may have a certain length and may be supplied so that they do not overlap each other at regular time intervals.

FIG. 1 is a schematic explanatory view of an FRP continuous molding method showing an embodiment of the present invention. Reference numeral 1 is a glass roving, which is arranged in one direction so as to obtain a required amount of fiber bundles. 2 is a glass continuous mat, and the glass roving 1
Is intervened on the lower surface of. A peelable sheet-like member 3 is drawn into the die 4 together with the fiber base material (glass roving 1) and drawn by the driving force of the drawing driving device 6.

When the glass roving 1 and the continuous filament mat 2 are drawn into the die 4, the resin liquid 10 is injected by the resin injection pump 5 from the resin injection port 4-1 provided in the die to impregnate the resin. 4-2 is a resin injection control valve. At this time, the length of the die is 50
The drawing speed is about 0 to 1500 mm and the drawing speed is about 0.2 to 1.5 m / min. The die 4 is heated and the resin is cured in the die to form a cured molded body 7. The cured molded body 7 is cut by a cutter 8 to form a molded product 9. The cut molded product 9 is a molded product in which the peelable sheet-like body 3 is inserted in the central portion, and a molded product in which the embossed pattern is transferred by peeling the peelable sheet-like product 3 is obtained. can get.

(Example) Hereinafter, the present invention will be described in detail with reference to an example.

As the pultrusion molding equipment shown in FIG. 1, a model MC8000 manufactured by Pultrex Limited of England was used.

As the die 4, a die having a drawing shape dimension (width 200 mm, thickness 6 mm cross section, 1300 mm length) shown in FIG. 2 (number unit is mm) was set.

FIG. 3 shows a cross section of the die. Resin injection port 4 for the die
-1 and resin injection port 4 so that the die can be heated
A heater was installed above and below the die from -1 to the die outlet, and the die temperature was controlled at 80 ° C on the inlet side and 150 ° C on the die outlet side.

Resin injection machine (Ve
HIS hydradioctor manufactured by nus Products Inc.) is installed and the resin injection pressure is set to 10 kg / cm ² G. The resin injection amount is controlled by the resin injection control valve 4-2 installed in the resin injection port 4-1. It was controlled so that it would not overflow from the die entrance.

FER-2310-1041 made by Fuji Fiber Glass is used as the glass roving 1 (fiber base material), and the peelable sheet-like body 3 has 260 pieces on the upper side and 260 pieces on the lower side. Retracted into. Further, as the glass continuous mat 2, a 200 mm wide glass continuous mat # 8624 manufactured by Asahi Fiber Glass Co., Ltd. was similarly drawn into the upper and lower parts of the peelable sheet-like body 3 respectively. 4 and 5 show these retracted states in the die.

Further, as the peelable sheet-like body 3, the following were prepared and intervened.

(1) Embossing depth of 50μ
0.2mm thick stainless steel plate embossed with m, fluorine-based mold release agent, FREKOTE FRP; HYSOL A
EROSPACE & INDUSTRI AL PRODUCTS DIVISION) processed.

(2) 200 μm polyester film (manufactured by Teijin Chemicals) embossed on the front and back sides to an emboss depth of 50 μm.

(3) Embossing depth of 50 μm on the front and back by etching
A 0.2 mm thick stainless steel plate embossed on a fluorine-based mold release agent, FREKOTE FRP; HYSOLAERO SP
ACE & INDUSTRIAL PRODUCTS DIVISION), then unsaturated polyester resin for gel coat Polyset 345P
To 100 parts by weight of T (manufactured by Hitachi Chemical Co., Ltd.), 1 part by weight of a curing agent Permek N (manufactured by NOF CORPORATION, methyl ethyl ketone peroxide) was added, and this was applied to the front and back surfaces of the stainless steel plate by a usual coating method. What was applied to a thickness of 0.3 mm and cured by curing at 50 ° C for 40 minutes. Resin solution 10 was mixed with the resin solution shown in Table 1 and supplied.

After the above preparations are completed, the withdrawal speed of the drive device 6 is set.
Set to 0.7 m / min, operate the above-mentioned pultrusion molding machine MC8000, cut to a length of about 2 m with the cutter 8, and peel the peelable sheet-like body 3 as shown in FIG. Two molded products 9 in which the embossed pattern on the surface of the sheet 3 was transferred to the upper molded product and the embossed pattern on the back surface to the lower molded product, respectively, were simultaneously obtained.

(Effect of the Invention) According to the present invention, a peelable sheet-like body does not directly slide on the surface in the die hole, and a molded product can be obtained smoothly and continuously. Further, two molded products can be obtained at the same time by the embossed patterns on the front and back surfaces of the peelable sheet-shaped body.

[Brief description of drawings]

FIG. 1 is a schematic explanatory view of a molding method showing an embodiment of the present invention, FIG. 2 is a dimensional drawing of a die used in the embodiment, FIG. 3 is a sectional view of the die, FIG. 4, FIG. FIG. 6 is a diagram showing a state in which the material is drawn into the die, and FIG. 6 is an explanatory diagram of a molded product that has been molded. Explanation of code 1 …… Glass roving 2 …… Glass continuous matte 3 …… Peelable sheet material 4 …… Dies 4-1 …… Resin injection port 4-2 …… Resin injection control valve 5 …… Resin injection Pump, 6 ... Pull-out drive device 7 ... Cured molded product, 8 ... Cutter 9 ... Molded product, 10 ... Resin liquid

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Seiichi Nami, 4-13-1, Higashimachi, Hitachi City, Ibaraki Prefecture Hitachi Chemical Co., Ltd. Yamazaki Factory (72) Inventor Masaaki Yasuda 4, 13 Higashimachi, Hitachi City, Ibaraki Prefecture No. 1 in Ibaraki Laboratory, Hitachi Chemical Co., Ltd. (56) Reference JP 56-121735 (JP, A) JP 62-8024 (JP, A) JP 1-317749 (JP, A)

Claims (1)

[Claims] 1. A fiber base material is drawn into a die hole, resin is injected into the die while the fiber base material is run in the axial direction of the die, and the fiber base material is impregnated and cured to continuously draw fiber-reinforced plastics. In the method described above, a peelable sheet-like body having embossed patterns formed on the front and back surfaces is continuously or intermittently interposed between the layers of the fiber substrate, and then the peelable sheet-like body is peeled off. Continuous molding method for fiber reinforced plastics.