JPH06190851A - Unit plate of fiber-reinforced plastic - Google Patents

Abstract

PURPOSE:To provide a unit plate of a fiber-reinforced plastic having a high flexural rigidity, a small deflecting amount, and a higher quality. CONSTITUTION:On the both sides of a core prepreg 11 of a chopped glass roving impregnated with a resin compound obtained by compounding an unsatd. polyester resin with an inorganic filler and a rapid-curing agent, outer surface-side prepregs 12 each made of a continuous strand mat impregnated with a resin compound obtained by compounding an unsatd. polyester resin with an inorganic filler and a curing agent realizing a curing rate lower than the curing agent compounded in the core prepreg 11 are disposed. The prepregs are heated and subjected to pressure molding.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fiber-reinforced plastic unit plate, and more specifically, a resin-impregnated fiber sheet (SM
C) A unit plate formed by the method.

[0002]

2. Description of the Related Art As shown in a sectional view of FIG. 2, a conventional fiber reinforced plastic (FRP) unit plate is manufactured by a lower mold 1
The continuous strand mat 2 not impregnated with resin is placed on top of it, and the chopped glass roving 3 impregnated with resin is further laminated thereon, the upper mold 4 is closed, and heating / pressurization is applied to continue. A method of impregnating a strand component with a resin component under pressure is adopted. In this case, the side on which the continuous strand mat is arranged is usually used as the outer surface.

In the case of the unit plate obtained by such a manufacturing method,
In the case of water tank applications that require higher flexural rigidity and smaller flexure, in addition to changing the composition of the unit plate such as increasing the plate thickness and increasing the glass content, it is possible to physically use metal. The method of fixing with the material was adopted.

[0004]

However, if the thickness of the unit plate is increased, the unit plate itself becomes heavier, and if the glass content is increased, the impregnation property and fluidity of the resin are lowered, and the metal content is also increased. The use of materials not only unnecessarily complicates the structure of the aquarium, but also increases the cost.

Therefore, an object of the present invention is to provide a unit plate made of fiber reinforced plastic which has a high flexural rigidity, a small amount of deflection and an improved quality.

[0006]

In order to achieve the above-mentioned object, the fiber-reinforced plastic unit plate of the present invention is a chopped glass resin compound containing an unsaturated polyester resin, an inorganic filler and a fast-curing curing agent. On both sides of the core prepreg impregnated in the roving, a resin compound containing an unsaturated polyester resin, an inorganic filler and a curing agent slower in hardening than the curing agent mixed in the core prepreg is continuous. It is characterized in that the outer surface side prepreg impregnated in the strand mat is arranged and heated and pressed.

[0007]

[Operation] According to the above configuration, since the outer surface side prepreg in which the resin compound is impregnated into the continuous strand mat on the surface of the unit plate is used, both surfaces are reinforced by this and the resin layer is formed on the outer surface. As a result, the glass floating phenomenon can be prevented and the weather resistance can be improved.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will now be described in more detail based on an embodiment shown in the drawings. FIG. 1 is a cross-sectional view showing a state at the time of molding a fiber-reinforced plastic unit plate of the present invention.

The fiber reinforced plastic unit plate of the present invention is one in which outer surface side prepregs 12, 12 are arranged on both sides of a core core prepreg 11, and the unit plate is placed in a mold consisting of a lower mold 13 and an upper mold 14. The molds are closed together by heating and pressure molding.

In the prepreg manufacturing machine, the core material prepreg 11 is prepared by first coating a resin compound having the following composition (A) on a thermoplastic resin film such as polyethylene or polypropylene which runs on an endless belt conveyor. Then, a predetermined length with a roving cutter, for example, glass roving cut into 1 inch (chopped glass roving) is sprayed, and then a thermoplastic resin film coated with the same compound (A) compound is overlaid, Then, defoaming impregnation is performed with a defoaming roll, for example, 40 ° C.
It can be manufactured by heating for 24 hours and aging and thickening.

Blend (A) Unsaturated polyester resin 80 parts by weight Low shrinkage resin 20 parts by weight Curing agent (eg t-butylperoxy isopropyl carbonate) 1 part by weight Internal mold release agent (eg zinc stearate) 5 parts by weight Filling Agent (eg calcium carbonate) 120 parts by weight Pigment 3 parts by weight Thickener (eg magnesium oxide) 0.7 parts by weight

Further, the outer surface side prepreg 12 is coated with a resin compound having the following composition (B) on a thermoplastic resin film such as polyethylene or polypropylene running on an endless belt conveyor in a prepreg manufacturing machine in the same manner as above. Work, superimpose the continuous strand mat and the other thermoplastic resin film on it, then,
It can be produced by performing defoaming impregnation with a defoaming roll and then heat aging and thickening.

Blend (B) Unsaturated polyester resin 80 parts by weight Low shrinkage resin 20 parts by weight Curing agent (eg t-butyl perbenzoate) 1 part by weight Internal mold release agent (eg zinc stearate) 5 parts by weight Filler ( For example, calcium carbonate) 120 parts by weight Pigment 3 parts by weight Thickener (eg magnesium oxide) 0.7 parts by weight

Here, in both of the above resin compounds, the curing agent used for the prepreg 11 for the core material is a curing agent that is faster in hardening than the prepreg 12 on the outer surface side. That is, when molding a thick one such as an aquarium unit plate, the curing rate of the outer layer is faster than the curing rate of the inner layer, so styrene gas or entrained air remains trapped in the inner layer, Large swelling may occur on the surface of the product, or the glass fiber may float, but by increasing the curing speed of the prepreg 11 for core material, it is possible to prevent gas or air from being trapped. As a result, it is possible to prevent the outer surface of the molded product from bulging and the glass fibers from rising. As the fast-curing curing agent, a fast-curing catalyst such as t-butyl peroctoate, t-amyl perbenzoate or peroxyketal may be used.

It is preferable that the outer surface side prepreg 12 uses 1 to 2 plies, and the core material prepreg 11 is arranged in the same or more layers as the outer surface side prepreg 12.

As a molding method, one outer surface side prepreg 12 is disposed on the lower mold 13, the core material prepreg 11 is disposed thereon, and the other outer surface side prepreg 12 is disposed thereon. They may be stacked on top of each other, or they may be stacked in advance and then arranged in the mold.

[0017]

As described above, the fiber-reinforced plastic unit plate of the present invention has an outer surface side prepreg in which a resin compound is impregnated on both sides of a continuous strand mat, as compared with the conventional unit plate for one-side reinforcement. Since they are arranged and reinforced, the bending rigidity can be increased and the amount of deflection can be reduced. Further, since the resin layers are formed on both surfaces, the glass fibers can be concealed, the glass fibers are prevented from rising, and the weather resistance is improved, so that the surface quality of the molded product can be improved.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an embodiment when molding a fiber-reinforced plastic unit plate of the present invention.

FIG. 2 is a cross-sectional view showing an example of molding a conventional fiber-reinforced plastic unit plate.

[Explanation of symbols]

11 ... Prepreg for core material, 12 ... Outer surface prepreg,
13 ... Lower mold, 14 ... Upper mold

Continuation of front page (51) Int.Cl. ⁵ Identification number Reference number in the agency FI Technical display area // B29K 67:00 105: 08 105: 16 4F B29L 9:00 4F

Claims (1)

[Claims] 1. An unsaturated polyester resin, an inorganic filler and an inorganic filler on both sides of a prepreg for a core material in which chopped glass roving is impregnated with a resin compound containing an unsaturated polyester resin, an inorganic filler and a quick-curing curing agent. The outer surface side prepreg obtained by impregnating a continuous strand mat with a resin compound containing a curing agent having a slower hardening property than the curing agent mixed in the prepreg for the core material is arranged, and heated and pressure-molded. A unit board made of fiber-reinforced plastic.