JPH062375B2 - Method for manufacturing composite heat insulating material - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an improvement in a method for producing a composite heat insulating material in which a heat insulating material and a reinforcing material having better strength characteristics are combined into an integral structure. Is.

[Prior Art] Conventionally, polystyrene foam, polyurethane foam,
Synthetic resin foams such as polyisocyanurate foam have excellent heat insulation properties, high specific strength, and workability.
It is used in a wide range of industrial fields as an economical heat insulating material.

However, in the case where a function as a strength member in addition to a function as a heat insulating material is required, such as a heat insulating material for a membrane type low temperature tank or a floor heat insulating material for buildings, it is necessary to increase the density. Therefore, there is a drawback that the excellent patentability described above is lost.

As one means for solving the above-mentioned drawbacks, a synthetic resin foam and a material having higher strength characteristics than that, for example, a low-foaming synthetic resin or a non-foaming synthetic resin are compounded into an integral structure, whereby a heat insulating material and strength are obtained. It has been proposed to combine the functions of members.

Further, as a method for compounding a synthetic resin foam and a reinforcing material, a method has been proposed in which a honeycomb structure hollow body is made of the reinforcing material, and a synthetic resin foaming undiluted solution is injected therein and foamed and cured to be integrated. .

However, in the above method, since the synthetic resin foam remains the strain generated in the formation process, when it is exposed to a low temperature range, there is a drawback that the synthetic resin foam and the honeycomb structure hollow body are separated. is there.

Further, as another method of compounding the synthetic resin foam and the reinforcing material, a method of laminating and integrating a plate-shaped synthetic resin foam using a liquid resin that becomes a non-foamed resin cured body by curing, A method has also been proposed in which a cut groove is provided in a plate-shaped synthetic resin foam, and a liquid resin is filled from the upper opening of the groove and cured to integrate the liquid resin.

However, all of these methods require a great deal of labor for compounding and have a serious economical defect and are poor in practicality.In particular, in the latter case, the liquid resin is filled from the upper opening of the groove. Therefore, it is impossible to completely fill the groove with the liquid resin.Therefore, it is possible to eliminate performance defects such as an unfilled portion in the groove and air voids in the cured resin. Can not.

[Problems to be Solved by the Invention] The main object of the present invention is to eliminate all the above-mentioned conventional drawbacks and to economically and inexpensively manufacture a composite heat insulating material formed by integrating a heat insulating material and a reinforcing material. There is something.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a heat insulating material, a molding reinforcing material having strength characteristics superior to those of the heat insulating material, and a synthetic resin having strength characteristics superior to those of the heat insulating material. In a method for manufacturing a composite heat insulating material having a reinforcing material as an integral structure, a step of molding a block body having a plurality of grooves open at the bottom surface from the heat insulating material, and the molding strengthening in the groove provided in the block body. A step of disposing a material, and a step of filling a liquid composition of the synthetic resin in an upward direction from a bottom opening portion of the groove into a space formed between the molding reinforcing material in the groove and an inner surface of the groove. The summary is to include.

[Operation] In the method for producing a composite heat insulating material including the above steps, since the liquid composition of the synthetic resin is filled upward from the bottom surface opening of the plurality of grooves provided in the block, it is present in the groove. Air is purged from the top opening of the groove. Therefore, there is no possibility of generating air voids in the synthetic resin reinforcing material formed in the groove, and by curing the liquid composition in the groove,
The molding reinforcement in the groove is integrally bonded to the block body.

DETAILED DESCRIPTION OF THE INVENTION FIG. 1 shows a composite heat insulating material manufactured according to the present invention.

In the figure, A is a composite heat insulating material, and synthetic resin foams such as polystyrene foam, polyurethane foam, polyisocyanurate foam, and phenol resin foam, and fiber materials such as glass fiber, rock wool, and ceramic fiber are used as a binder. A heat-insulating material 1 composed of a wood-based material such as balsa, which is a fibrous material accumulated by utilizing the entanglement of fibers, with or without use, and a low-foam synthetic resin having strength characteristics superior to that of the heat-insulating material. Or non-foam synthetic resin or wood materials such as FRP, plywood,
A molded reinforcing material 2 made of ceramic or the like and a reinforcing material 3 made of synthetic resin having strength characteristics superior to those of the heat insulating material 1 are integrally combined as an aggregate.

A method of manufacturing the composite heat insulating material having the above structure is shown in FIGS. 2 to 5.

First, as the heat insulating material 1, as shown in FIG. 2, a block body a having an opening 4 on the bottom surface and a plurality of grooves 5 extending to the upper surface is formed.

As means for forming the block body a, a plate, a prism,
A member such as a cylinder, a square cylinder, or a cylinder is erected at a predetermined distance on a fixing member 6 such as a perforated plate, a glass cloth, or a wire net that is permeable to a liquid composition of synthetic resin, There are means for fixing to the fixing member 6 with a set screw or an adhesive, or means for forming a cut groove upward from the bottom surface of the block body by using a cutting tool such as a saw.

As shown in FIG. 3, for example, as shown in FIG. 3, the molding reinforcing material 2 disposed in the groove 5 of the block body a is formed by intersecting a large number of plate-shaped members 2a provided with cutting grooves so as to intersect with each other in the cutting grooves. It is preferable that the block body a is assembled in a lattice shape and can be inserted and arranged in the groove 6 of the block body a.
A plate-like member having a width of the groove interval may be inserted and arranged in each groove 6.

It should be noted that the molding reinforcing material 2 disposed in the groove 5 of the block body a
The distance between the opposing surfaces of the groove 5 and the groove 5 is such that the liquid composition of the synthetic resin forming the reinforcing material 3 described above can penetrate between the two, and the properties of the liquid composition used and filling equipment, etc. Take into consideration and make an appropriate decision.

The synthetic resin forming the reinforcing material 3 is preferably a thermoplastic or thermosetting synthetic resin having a strength property superior to that of the heat insulating material 1 when it exhibits a liquid state by heating, melting, use of a liquid raw material, and the like, In particular, epoxy resin, polyurethane resin, polyisocyanurate resin, unsaturated polyester resin, epoxy acrylate resin and the like, the raw material is a liquid at room temperature, and the curing reaction proceeds at room temperature, at that time,
It is preferable because no by-products are generated.

The synthetic resin liquid composition forming the reinforcing material 3 may be appropriately blended with a reinforcing material, a filler, a flame retardant, etc., which are known in the resin field. As the reinforcing material 3 made of synthetic resin, both foamed resin and non-foamed resin can be used as long as they satisfy the above conditions.

Thus, the block body a in which the molding reinforcement 2 is disposed
As shown in FIG. 4, by floating on the liquid composition 8 of the synthetic resin in the tank 7 and then gradually submerging the block body a into the liquid composition 8, or by using a pumping device such as a pump. By using it, the block 5 a containing the molding reinforcement 2 is directed upward from the bottom opening 4 and the groove 5 is formed.
The air existing in the space 9 between the reinforcing material 2 and the reinforcing material 2 is removed from the upper surface opening and is replaced with the air to completely fill the space 9 with the liquid composition 8.

After that, when the liquid composition 8 is cured in the space portion 9,
A composite heat insulation material A is obtained in which the required molding reinforcement material 2 and the synthetic resin reinforcement material 3 in which the liquid composition 9 is cured are disposed at the required portions of the heat insulation material 1, and the two are integrally combined.

When the space 9 is filled with the liquid composition 8, a liquid composition-permeable reinforcing material such as glass cloth may be loaded and the liquid composition may be cured. The strength of the resin reinforcing material 3 and further the composite heat insulating material A can be further improved.

Further, if the composite heat insulating material A formed as described above is further provided with a cut groove and the molding reinforcing material 2 and the synthetic resin reinforcing material 3 are arranged in the groove as in the above, it is possible to arrange it at a desired position. It becomes possible to dispose a desired reinforcing material, and it is possible to obtain a composite heat insulating material having no physical property directionality.

[Examples] Example (1) Grooves each having a width of 1.5 mm were arranged in a grid pattern with an interval of 30 mm and were arranged in the vertical direction with an opening provided on the bottom surface. A hard urethane foam (density 60 kg / m ³ ) block body having a bottom of 60 cm × 60 cm and a height of 20 cm provided with a 1.0 mm-thick FRP was placed on the liquid surface of the liquid composition of unsaturated polyester resin. Then, while gradually sinking, a liquid composition of the unsaturated polyester resin is added upward from the bottom opening into the space between the inner surface of the groove of the rigid urethane foam block body and the surface of the FRP, and the synthetic resin reinforcement material is added. The liquid composition was cured as it was.

After leaving this product for 2 days, it was disassembled and the internal condition was examined. As a result, all voids between the inner surface of the groove provided in the rigid urethane foam block body and the surface of the FRP were completely free of defects such as air voids. The unsaturated polyester resin that does not exist is completely filled, and the rigid urethane foam block as the heat insulating material, the FRP as the molding reinforcing material, and the unsaturated polyester resin as the synthetic resin reinforcing material are firmly bonded as an integral structure, No scorch or cracks were generated in the rigid urethane foam block, and a composite heat insulating material with a uniform width of the reinforcing material was obtained. The density of this composite insulation is 24
It was 0 kg / m ³ and the compressive strength was 190 kgf / cm ² .

Furthermore, even when this composite heat insulating material is left in crushed dry ice for 2 days, neither the adhesive interface of the hard urethane foam block, the FRP, nor the unsaturated polyester resin is peeled off, which is practically harmful. No phenomenon was observed.

Example (2) Grooves each having a width of 5 mm and having a width of 5 mm are arranged in the vertical direction by providing openings on the bottom surface and arranged in the vertical direction. A phenolic resin foam block (density 40 kg / m ³ ) having a bottom of 50 cm × 50 cm and a height of 20 cm, in which a strip-shaped Apiton plywood having a length of 4 mm is arranged so that discontinuities are not formed as much as possible, and a block composition of an epoxy resin liquid composition Place on the liquid surface, then in Example (1)
Similarly to the above, the liquid composition of the epoxy resin was filled upward from the bottom opening portion as a reinforcing material of the synthetic resin, and cured as it was.

After leaving this product for 2 days, it was disassembled and the internal condition was examined. As a result, it was completely filled with an epoxy resin having no defects, and a phenol resin foam block, Apiton plywood as a molding reinforcing material, and a synthetic resin. Epoxy resin as a reinforcing material was firmly bonded as an integral structure.

Example (3) A grid having a width of 2.5 mm and having a width of 2.5 mm was arranged vertically with an opening formed on the bottom surface, and a grid having a thickness of 2.0 mm was formed inside the groove as a molding reinforcing material. 50 cm x 50 cm bottom and 30 cm high hard urethane foam (density 50 kg / m ³ ) block body on which the urethane resin molding plate is placed is provided with an injection hole in a part of the bottom opening, and a pressure pump is used. At a pouring pressure of 0.5 kgf / cm ² , a urethane resin liquid composition as a synthetic resin reinforcing material was filled from the pouring hole and cured as it was.

After leaving this for one day, it was dismantled and the internal conditions were examined. As a result, air voids and the like were found in all the space between the inner surface of the groove provided in the rigid urethane foam block body and the surface of the urethane resin molded plate. The urethane resin, which had no defects at all, was completely filled, and no cracks or scorch that would be harmful in practical use were observed. Further, even when the composite heat insulating material was dipped in liquid nitrogen, the occurrence of practically harmful phenomena such as cracking and peeling was not recognized.

[Advantages of the Invention] As described above, according to the present invention, a block body having a plurality of grooves open at the bottom surface is formed of a heat insulating material, and the groove provided in the block body is stronger than the heat insulating material. A molding reinforcement having excellent characteristics is disposed, and in the space formed between the inner surface of the groove formed in the block body and the molding reinforcement, the space in the space increases upward from the bottom opening of the block body. While excluding the air, the liquid composition of the synthetic resin, which is more excellent in strength characteristics than the heat insulating material, is filled and cured to set the desired molding reinforcement and the desired molding reinforcing material at the desired position in the heat insulating material. Since a reinforcing material made of synthetic resin is arranged and these are combined into an integral structure, a groove made by providing a reinforcing material made of synthetic resin in the heat insulating material, in which performance defects such as air voids are completely eliminated. And between the molding reinforcement placed in the groove Can be completely filled. Moreover, since the synthetic resin is in a liquid state, it is filled while wetting the inner surface of the groove provided in the heat insulating material and the surface of the molding reinforcing material, and is hardened as it is, so that these bonds are perfect and mechanical and / or thermal It is possible to completely eliminate the occurrence of a phenomenon that loses its function such as peeling due to the action, and the liquid composition of the synthetic resin is formed in the groove provided in the block body in the presence of the molding reinforcing material. Since the curing reaction proceeds and the reinforcing material is formed with the two as an integrated structure, in the case where heat of reaction based on the curing reaction of the liquid composition is generated,
The reaction heat can completely eliminate the occurrence of practically harmful phenomena such as cracks and scorch in the reinforcing material and / or the block body, so that the quality reliability is further enhanced, and a desired amount of the reinforcing material is desired. It can be placed in any position, and by selecting the material and thickness of the molding reinforcement material, it enables infinite design based on the balance between performance and cost.
It is possible to economically manufacture a composite heat insulating material having extremely excellent performance.

[Brief description of drawings]

FIG. 1 is a perspective view of a composite heat insulating material manufactured by the method of the present invention, FIG. 2 is a perspective view of a block body that serves as a heat insulating material, FIG. 3 is a perspective view of a molding reinforcing material, and FIGS. 4 and 5 are It is explanatory drawing which shows the order of the main processes which manufacture a composite heat insulating material. A: Composite heat insulating material, 1 Heat insulating material, 2 Molding reinforcing material, 3 Synthetic resin reinforcing material, 4 Bottom block opening of block body, 5 block material Groove 6, 6 ... Fixing member, a ... Block body, 7 ... Tank, 8 ... Synthetic resin liquid composition, 9 ... Space portion.

Claims (1)

[Claims] 1. A method for producing a composite heat insulating material comprising a heat insulating material, a molded reinforcing material having strength characteristics superior to that of the heat insulating material, and a synthetic resin reinforcement material having strength characteristics superior to that of the heat insulating material. In, a step of molding a block body having a plurality of grooves that open at the bottom surface from a heat insulating material, a step of disposing the molding reinforcing material in the groove provided in the block body, and a molding reinforcing material in the groove. A method for producing a composite heat insulating material, comprising the step of filling a space formed between the groove inner surface and the groove inner surface with the liquid composition of the synthetic resin upward from the bottom opening of the groove.