JPH01242210A - Glass fiber reinforced polyester resin molded product - Google Patents

Abstract

PURPOSE:To manufacture a tough resin molded product by blending glass long fibers in a foam unsaturated polyester resin layer mixedly and bonding the long fibers and the resin layer in a matrix manner. CONSTITUTION:When unsaturated polyester resin 10 containing a foaming agent is case on a FRP sheet 30 placed on a bottom force 5, already cured polyester resin as an FRP substance and uncured injected polyester resin 10 are bonded together and integrated firmly while being cured. When the injected resin 10 is foam cured, resin 10 is prevailed thoroughly over into the gaps among glass long fibers 20 developed on the FRP plate 30, and a strong bonding structure like a matrix is constituted as the resin 10 is cured. As the long fibers, a swirl mat constituted of spirally laminated glass long fibers in the mat form are preferred from the viewpoint of strength.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to rIIM and manhole covers for sewage treatment tanks.

Purification water tanks, containers for transporting fresh fish and shellfish, and other stores (related to glass fiber-reinforced polyester resin molded products used in the industrial field and their manufacturing methods).

(Prior art) A y! The lid is installed. This rIIM is required to be strong and lightweight because people walk on it for maintenance purposes and it may be opened and closed. For that reason,
Recently, INs made of FRP have become widely used. FRP is made by laminating chopped glass fibers (chopped strands) and polyester resin alternately, defoaming them, and curing them in one piece according to the mold.It is extremely strong due to the reinforcing effect of the glass fibers, and is highly durable compared to metals. Since it is lighter and has superior contact resistance than other materials, it has become desirable for use in the above-mentioned rIIM and the like.

(Problem to be solved by the invention) However, since the above-mentioned FRP cover is a hardened molded body of dense polyester resin, although it is said to be lighter than a metal cover, its weight is a problem in actual maintenance. There were many cases where this happened.

The present invention was made as a result of intensive research in view of the above, and is a novel glass fiber that maintains toughness and is lighter than conventional F"Rll molded products, and is preferably used for the above-mentioned ri-i etc. The purpose of this invention is to provide a reinforced polyester resin molded product and an effective manufacturing method thereof.

(Means for Solving the Problems) The structure of the present invention for achieving the above object will be explained based on the attached embodiment diagrams. FIG. 1 is a partially cutaway longitudinal cross-sectional view showing an example of the molded product of the present invention according to claim 1, FIG. 2 is a partially cutaway longitudinal cross-sectional view showing an example of the molded product of the present invention according to claim 2, and FIG.
The figure is a flowchart 1 diagram showing an example of the method of the present invention according to claim 3, FIG. 11 is a longitudinal sectional view showing an application example of the molded product according to claim 2, and FIG. 5 is an example of the same FIG. That is.

The gist of the glass fiber-reinforced polyester resin molded product according to claim 1 of the present invention is that long glass fibers 2 are integrated with C in a foamed unsaturated polyester resin PiIi, and claim 2 The gist of the molded product is that a surface layer 3.4 of FRP is integrally laminated on at least the upper and lower surfaces of a foamed polyester resin layer 1 in which long glass fibers 2 are mixed and integrated. Furthermore, the method for manufacturing a glass fiber reinforced polyester resin molded product according to claim 3 includes the steps of: framing the FRP board 30 placed on the lower mold 5 with a molding frame 6; A step of expanding the lath long fibers 20, a step of injecting the unsaturated polyester resin 10 containing a foaming agent into the frame 6, and a step of injecting the FRI) board 40 with glass fibers 41 attached to the lower surface of the injected polyester resin 10. A step of placing it on the layer, a step of foaming the polyester resin 10 between the upper mold 7 and the lower mold 5, and a step of demolding the lower mold 5.7 and the molding frame 6. The main purpose of this is to achieve the following goals.

As the long glass fibers 2 (20), a so-called swirl mat, which is formed by laminating continuous long glass fibers in an island-like manner and forming a mantle shape, is preferably used, and this is, for example, a product name of Kafiber Glass Co., Ltd. It is available on the market as "Classlon Continuous Strand Pine 1-".亦、F
The glass fiber 41 attached to the lower surface of the RP board 40 is also preferably made of the swirl mat, which is attached and integrated in advance with polyester resin, adhesive, or the like. Furthermore, a normal FRP molded plate is adopted as the first surface layer 3.4.

(Function) In the molded product according to claim 1, since the long glass fibers 2 are mixed and integrated in the foamed unsaturated polyester resin layer 1, the long fibers 2 and the resin layer 1 form a matrix. Be made extremely strong through bonding relationships. In particular, since the long fibers 2 are intertwined with each other and integrated into the resin layer 1, the shear resistance is enhanced compared to normal FRP using short fibers.

Furthermore, since the resin layer 1 is made of a foamed unsaturated polyester resin, the presence of the foamed voids reduces the weight of the entire body, and further provides heat insulation properties.

In addition to the above, the molded product according to claim 2 has surface layers 3.4 made of FRP integrally laminated on at least the upper and lower surfaces of the resin layer 1, and as a result of imparting rigidity, the deflection resistance is improved. , is said to be the most desirable cover for the sewage septic tank, etc.

Furthermore, in the manufacturing method according to claim 3, when the unsaturated polyester resin 10 containing a foaming agent is injected onto the FRP treatment 30 placed on the lower mold 5, 1? The cured polyester resin, which is the substance of the RP, and the uncured injected polyester resin 10 are bonded together and become firmly integrated as they harden.

In addition, when foaming and curing the injected resin IO, 0 on the FRP board 3
Resin 1 is applied to the interfiber gap of the glass long fibers 20 opened at the top.
0 spreads everywhere, and as the resin 10 hardens, a strong 7-trix-like bonding structure is formed. In particular, resin 10
As it hardens, it foams and flows within the molding frame 6, acting on the long glass fibers 20, but since the fibers 20 are long and fibrous and intertwined with each other, there is no shadow! 9 and is enclosed in the cured resin 10 in a uniform state throughout. Then, the bubbles that are successively generated in the resin 10 become larger and try to move upward, but the long glass fibers 20
This is prevented, and as the resin hardens, it becomes fixed in a uniformly dispersed state as minute bubbles within the 10 layers of resin.

As a result of the long glass fibers 20 being uniformly encapsulated and the small air bubbles being fixed in a uniformly dispersed state in this way, the strength distribution of the molded product is constant, making it extremely suitable for use in the above-mentioned rIM and the like. Furthermore, when foaming and curing the multinuclear resin 1O placed on the 10 layers of zero-containing resin on the FRP board 4, one layer of the resin 10 was added between the fiber gaps of the glass fibers 41 attached to the bottom surface of the FRP board 40. In the molded product (FIG. 2) which is the result of the resin layer 1 and the surface layer 4 being solidly integrated, the resin layer 1 and the surface layer 4 are solidly integrated. By the way,
When the FRP temporary 40 is placed directly on the injected resin 10 and foamed and hardened without attaching the glass fiber R41, the resin 10
When the resin 10 foams and moves upward to reach the lower surface of the FRP board 40, the resin 10 hardens to a certain extent, making it difficult to form a zero body on the FRP board 4, and since it is foaming, the contact area with the RP board 40 is small. The surface layer 4 of the molded product is easily peeled off from the resin layer 1. Thus, polyester resin 10
After foaming and hardening, the upper and lower molds 5.7 and the molding frame 6 are removed, and a multilayer molded product as shown in FIG. 2 is obtained.

(Example) Next, the present invention will be explained in further detail with reference to Examples. FIG. 4 shows an example in which the molded product according to claim 2 is applied as a cover for a sewage tank 7. In this example, the upper and lower FRP plates 30 and 40 in the above molding method are turned upside down, that is, the FRP plate 30 placed on the lower mold 5 becomes the surface layer 3 on the upper surface side, and the injected resin is FRP placed on 10 layers and integrated
Plate 4 is molded into a plate shape so as to form the surface layer 4 on the 0 side of the board, and after molding, polyester resin or the like is applied and hardened to the end of the board to form resin board 3.
1. This JAM is covered by supporting the sewage water (1 attached to the opening edge of the tank 7) on the mold angle material 71.Furthermore, the surface of the upper surface layer 3 has fine irregularities 32... This provides non-slip properties when walking.

The cover shown in FIG. 5 has a side plate 33 on the side of the upper surface layer 3 that projects downward from the side edge of the lower surface layer 4, and is attached to the opening edge of the sewage layer 7. For example, FRPI!
l! It is covered by being carried by the angle material 72 of. FjlM with such a configuration is made of FRP board 3 during the above molding.
A bat-shaped molded product with an open top is used as FRP plate 4.
It is obtained by placing it in a drop-lid shape on 10 layers of zero-containing resin on a board.

In the case of rolling, a metal core 11 is enclosed within one foamed unsaturated polyester resin layer 1 and further reinforced, and is preferably employed in conjunction with the above. It is not excluded that this reinforcing core may be enclosed not only within the resin layer 1 but also within the first surface layers 3 and 4 or the side plate 33.

In FIG. 3, the molding that is framed on the lower mold 5? I-6
is formed into a rectangular shape by four wooden frame members 61, and each frame member 61 is connected and supported by support rods 62, which are orthogonal thereto. The support rods 62 can be movably installed on the sides of the lower mold 5 and in the direction perpendicular thereto, and their positions can be set appropriately to form the frame members 61 in a houndstooth pattern as shown in the figure. The rectangular divided area formed by these frame members 61 is used as a molding frame 6. Therefore, a molded product of a desired size can be obtained by appropriately adjusting the positions of the support rods 62. A temporary FRP 30 is placed on the bottom of the molding frame 6 framed on the lower mold 5 in this manner, and the long glass fibers are further spread on this so as to spread uniformly over the entire surface. Then, as shown in the figure, an appropriate amount of unsaturated polyester resin 10 containing a foaming agent is injected by considering the foaming ratio, and after checking that the resin 16 begins to foam after a slight interval, the FRP treatment 40 is made of glass fiber 41. It is placed over the 10 layers of injected resin with the attached side facing down, and then an upper mold 7 is placed on top of this and pressure molded. During molding, the resin 10 continues to foam, but during this time, as described above, the long glass fibers 20 hardly move and are maintained in a fully expanded state, and the bubbles do not become large and are fixed in a uniformly dispersed state within the 10 resin layers.

Then, the resin 10 is filled into the space between the two full molds 5.7 while foaming, and when the resin 10 begins to ooze out from between the seven circles of the molding frame 6 and the upper mold 7, the resin 10 is filled into the space between the two full molds 5.7. Foaming pressure 1 for 7
Pressure is applied against this. Thereafter, after waiting for the resin 10 to harden, the lower mold 5.7 and the molding frame 6 are released, and a molded product as shown in FIG. 2 is obtained. Here, as a method for attaching the glass fiber 41 to the F R)) board 40, the F RT-' board 40
After forming, a method of applying polyester resin and placing the glass fibers 41 fi, or a method of placing the glass and fibers 41 in the final step of molding the FRP board 40 and then hardening them, etc. are adopted.

In the embodiments shown in FIGS. 4 and 5, the W lid of a sewage tank was used as an example, but it can also be applied to manhole covers, scrapers for removing mud from sewage treatment equipment, containers for transporting fresh fish and shellfish, and other industrial fields. It is easy to imagine that their suitability will increase when applied to containers and the like for use in containers, etc., due to their toughness, light weight, and heat insulating properties. In addition, the shape is not limited to the inverted shape, and other shapes can be adopted. For example, in the case of a sewage tank cover, multiple covers are installed in parallel, and the ends are L-shaped so that adjacent 'I;in's overlap each other at the joints to ensure airtightness. This does not exclude doing so. Furthermore, l in Figures 4 and 5
η To make the water tank 7 completely airtight, use angle material 7.
It is of course possible to interpose a gasket between 1.72 and the cover.

(Effect of the invention) As mentioned above, the glass fiber-reinforced polyester resin molded product of the present invention is actually a foamed unsaturated polyester resin layer in which long glass fibers are mixed and integrated. It is strengthened by the matrix-like bonding structure with FRP molded products, and is even lighter and more rigid than conventional FRP molded products.If this is used for rIIM of sewage treatment layers, manhole covers, etc., it will have great maintenance benefits. Moreover, it also provides insulation properties, so fresh fish R category 1)
Preferably used in injection containers and other uses. and,
When a surface layer made of FRLl is integrated on both the upper and lower surfaces of this polyester resin layer, a reinforcing effect is added by the surface layer, and the suitability for the above-mentioned uses is further increased due to the bending resistance.

(1) In the manufacturing method according to claim 3 of the present invention, when the polyester resin is injected onto the FRP plate on which the long glass fibers are spread, even if a flow effect is applied due to the foaming of the resin, the glass Since the fibers are long fibers and are spread out in a state where they are entangled with each other, they are encapsulated in a uniform state over the entire surface of the resin layer without being affected by this, and are fixed in a uniformly dispersed state that increases the size of air bubbles. This ensures the production of a molded product with a constant strength 4j. Also.

Because glass fiber is attached to the bottom surface of the FRP board that is placed on the polyester resin layer E injected into the molding frame,
During molding, uncured polyester resin enters between the fiber gaps of the glass fibers and is cured, resulting in the foamed unsaturated polyester resin layer and surface layer being firmly integrated, creating a multilayer structure with high interlayer peel strength. A molded product is obtained.

In this way, the present invention is different from the conventional l? It has remarkable performance that cannot be obtained with RP molded products, and its manufacturing method is extremely simple and guarantees the production of excellent molded products, making it extremely useful.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway longitudinal sectional view showing an example of the molded product of the present invention according to claim 1, Fig. 2 is a partially cutaway longitudinal sectional view showing an example of the molded product of the invention related to claim 2, and Fig. 3 is a flowchart showing an example of the method of the present invention according to claim 3, FIG. 4 is a longitudinal sectional view showing an application example of the molded product according to claim 2, and FIG. be. (Explanation of symbols) 1... Foaming unsaturated polyester resin layer, 10 Foaming unsaturated polyester resin, 2.2o... Glass long fiber, 3.4... Surface layer, 30.40 - FRP board, 41... Glass fiber, 5.7, top]; Mold, 6
...Molding frame. Hidehiko Matsuno, agent of Takiron Co., Ltd., patent attorney (6235), Figure 1, figure 2, 5.7... upper and lower molds, 6... molding frame, figure 4, figure 5

Claims (1)

[Claims] 1. A glass fiber-reinforced polyester resin molded product comprising long glass fibers mixed and integrated in a foamed unsaturated polyester resin layer. 2. A glass fiber-reinforced polyester resin molded product consisting of a foamed polyester resin layer in which long glass fibers are mixed and integrally laminated with FRP surface layers on at least the upper and lower surfaces. 3. A process of framing the FRP board placed on the lower mold with a molding frame, a process of developing long glass fibers on the FRP board, and an unsaturated polyester resin containing a foaming agent in the frame. Injection process and FRP with glass fiber attached to the bottom surface
Glass fiber reinforcement comprising the steps of placing the plate on the injected polyester resin layer, foaming the polyester resin between the upper mold and the lower mold, and demolding the upper and lower molds and the molding frame. Method for manufacturing polyester resin molded products.