JPH0422999Y2 - - Google Patents

Description

[Detailed explanation of the idea]

(Field of Industrial Application) The present invention relates to a fiber-reinforced synthetic resin foam that is lightweight, has excellent heat insulation properties, corrosion resistance, and mechanical strength, and is suitable for heat-insulating structural members used in ships, houses, and other general industries. . (Prior art) When reinforcing a hard synthetic resin foam with a fiber material, the outermost layer is a continuous strand mat reinforcing layer, the inner layer is a glass roving reinforcing layer aligned in one direction, and the central core material is a reinforced layer of glass roving drawn in one direction. The technique of arranging paper or plastic honeycomb layers and integrating them with a thermosetting resin foam such as polyurethane resin or phenol resin is known in Utility Model Publication No. 58-54999 and Japanese Patent Publication No. 59-35340. It is. However, in this method, a highly rigid honeycomb material is used for the core material layer, so if you want to increase the bulk density of the fiber reinforcement material to increase the strength of the surface layer, the foaming pressure of the foamable synthetic resin alone cannot be enough. Impregnation into the reinforcing layer tends to be uneven, and even if pressure is applied from the top side to aid impregnation, compressive force is not applied to the hollow parts of the honeycomb material, making it difficult to improve the surface strength uniformly. However, it was not possible to form a wood grain pattern at the same time as molding. In addition, on both sides of the cotton-like aggregate or open-cell foam,
A heat-foamable thermosetting resin layer is interposed, sheet materials such as metal, plastic, or cloth are laminated, and the thermosetting resin is foamed and hardened by heating in a partially compressed state. A method of bonding thermosetting resin layers together at the compressed part to obtain a composite with low hygroscopicity and excellent heat insulation was published in 1983.
Although it is known from No. 27709, productivity is poor because the composite is molded in batches using a mold, and in order to form a wood grain pattern on the surface of the molded product, a surface layer must be formed in advance. There was a drawback that it was necessary to print a wood grain pattern on the sheet-like material or to further bond the printed decorative layer. (Problem to be solved by the invention) This invention creates a straight-grained pattern by the foaming pressure of the synthetic resin foam by arranging glass roving reinforcing layers aligned in one direction in parallel on the upper and lower outermost layers. can appear, and by simply adjusting the number of glass rovings and the spacing between parallel arrays,
A desired straight-grained wood grain pattern can be formed continuously. In addition, continuous supply of the plate-like material is facilitated by providing the central core material layer with a flexible plate-like material that has a large restoring force against compression and has open pores that are easily impregnated with the foamable synthetic resin. By compressing with Nitprol, etc., uniform impregnation of the foamable synthetic resin becomes easy, and by adjusting the thickness of the plate, it is possible to clearly separate the glass roving reinforcing material into the upper and lower outer layers. They were able to control this structure extremely easily, and succeeded in obtaining a composite structure with excellent bending strength by forming a structure in which glass fiber reinforcing layers were arranged above and below a pair of elastic plates in a so-called sandwich-like structure. (Purpose of the invention) As mentioned above, the present invention solves the problems of the conventional technology by uniformly impregnating the glass fiber reinforced layer with the foamable synthetic resin and by clearly disposing the glass fiber reinforced layer into the upper and lower surface layers. The object of the present invention is to obtain a composite structure with improved surface strength and bending strength, and with which a wood grain pattern can be easily formed on the surface. (Structure of the invention) The constituent elements and structure of this invention will be explained based on the drawings. As the glass fibers aligned in one direction used for the outermost layer 1, commercially available glass rovings are used. There is no particular restriction on the count (weight per 1000m) to be used, but in general, a fine grain pattern can be obtained by arranging glass rovings with a small count closely spaced parallel to each other; If they are made larger and arranged in parallel, a coarse grain pattern tends to be obtained, so they may be selected appropriately depending on the application and the required surface strength. When high strength is obtained, the weight per 1000m is
2310-4630g is used. The glass fiber cloth reinforcement layer 2 used on the inner surface of the glass roving reinforcement layer 1 has the outermost glass roving reinforcement layer aligned in one direction, further improving the bending strength in the width direction. However, this layer can be omitted unless particularly high bending strength is required. In addition, when increasing the strength only with the glass roving reinforcing layer 1, two or more glass roving layers can be laminated. As the open-pored plate-like material 3 used for the center layer, any material with coarse pores that has a high thickness recovery rate when compressed and can be easily impregnated with a relatively viscous synthetic resin foaming stock solution can be used. It is. Suitable materials include open-pore soft polyurethane foam, polyvinyl chloride foam, and mat-shaped synthetic fibers, with soft polyurethane foam being particularly suitable. When using soft polyurethane foam, the number of cells specified in JISK6402 is between 25 mm.
40 or less, preferably 5 to 20, compressive residual strain specified in JISK6401 is 10% or less, preferably 3
It is preferable to use 7%. The thickness of the continuous porous plate-like body 3 is determined by the thickness of the final molded body F and the thickness of the glass fiber reinforced layer used in multiple layers, but is generally 15 to 15 times the thickness of the final molded body F. 50
A range of % is preferred. As the hard synthetic resin foam 4 used in the present application, liquid polyurethane foam or phenol foam is suitable as a raw material, and thermosetting resins such as epoxy resins and unsaturated polyester resins can also be used. The most efficient method for manufacturing the composite body with the wood grain pattern of the present invention is to use a known conveyor system that allows for continuous production, but it is also possible to manufacture it in batches using molds if necessary. can.
As the outermost layer of glass roving, ER-4630 manufactured by Asahi Fiberglass Co., Ltd. (1000 m
Roving cloth RH600AA made by Asahi Fiberglass Co., Ltd. (plain weave, density 6.3 threads, weft 6.3
A soft polyester urethane foam with a thickness of ³ mm and a cell count of 10 and a compressive residual strain of 7% was used for the center layer, a free foaming density of 200 Kg/m ³ , a cream time of 90 seconds, and a rise time of 90 seconds. A composite molded product having a wood grain pattern with a molded product thickness of 15 mm and a molded product density of 500 kg/m ³ was obtained using a hard urethane foam stock solution for 5 minutes. The physical properties of this composite molded product were measured and compared with the physical property values of commercially available similar products, and as shown in Table 1, it was found that the composite molded product had particularly excellent strength in the width direction.

[Table] (Effects of the invention) (1) By providing a reinforcing layer of glass rovings aligned in one direction as the outermost layer, the parallel arrangement of glass rovings becomes a flow pattern due to the foaming pressure on the surface of the molded structure. It can be exposed as is to form a straight-grained wood grain pattern. Therefore, by simply adjusting the glass roving count and the parallel arrangement interval, a desired wood grain pattern can be easily obtained, and the bending elasticity in the longitudinal direction can be improved. (2) By simultaneously using at least one non-directional glass cloth reinforcing layer on the inner layer side of the glass roving reinforcing layer, the strength in the width direction and the strength of the molded product can be improved. (3) Since an open-pored plate with excellent compression properties is used for the center layer, immediately after injecting the synthetic resin foaming stock solution, a glass fiber reinforced layer is laminated and the entire system is highly compressed. By simply carrying out this process, the foamable stock solution will diffuse and permeate throughout the system, and a uniform composite foam molded article will be obtained. In addition, since the continuous porous plate-like material exists in the center layer, the glass fiber reinforcement layers arranged above and below are clearly separated and are located on the upper and lower surface layers, which contributes to improving the flexural modulus. considered to be a thing. Because of the above-mentioned effects, the composite structural material obtained by the present invention can be said to be extremely useful as a heat-insulating structural member for buildings, ships, and civil engineering.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the structure of the composite structural material of the present invention. F...Composite structure molded product, 1...Glass roving reinforcement layer, 2...Glass fiber cloth reinforcement layer, 3...
Open-pore plate-like body, 4...Hard synthetic resin foam.

Claims (1)

[Scope of utility model registration request] In a foamed synthetic resin structure having a glass fiber reinforced layer consisting of multiple layers, at least the upper and lower outermost layers have glass roving reinforcing layers aligned in one direction, and the center layer is a continuous porous plate having compression recovery properties. 1. A composite structure having a wood grain pattern, which is characterized by providing a shaped body and integrally impregnating it with a foamed synthetic resin.