JP4526824B2 - Metal composite panel filled with phenolic resin - Google Patents

Description

  The present invention relates to a metal composite panel used as a building insulation material such as a wall material or ceiling material for building materials, a roof, a heat insulation panel for a refrigerated warehouse, etc., and has a phenolic resin foam layer inside the panel. The present invention relates to a metal composite panel.

In the method of manufacturing a metal composite panel having a phenolic resin foam layer inside, a phenolic resin-filled metal is prepared by directly injecting a phenolic resin foam composition comprising a phenolic resin, a surfactant, a foaming agent, and a catalyst into the metal panel and foaming and curing There are methods for manufacturing composite panels.
In order to produce panels with low thermal conductivity by this method, the problem is how to quickly transfer the condensed water generated by the phenol resin curing reaction to the outside of the panel. Have proposed various methods. There is no prior art that is directly related to the present invention, but related field technologies include, for example, Japanese Patent Laid-Open No. 02-043033, Japanese Patent Laid-Open No. 02-043034, and Japanese Patent No. 3230207. These technologies describe a method for removing moisture that hinders cell formation during foaming when the phenol resin is foam-cured, and the purpose of the method for producing a panel with low thermal conductivity of the present invention is as follows. It is a completely different technology.

  As another method for producing a phenol resin metal composite panel, there is a method of producing a metal composite panel by bonding a phenol resin foam molded article and a metal steel plate using an epoxy adhesive or the like. Since this manufacturing method uses a phenolic resin foam molded product, the condensed water generated during the phenol resin curing reaction has already been scattered in the manufacturing process, so it is easy to manufacture a panel with low thermal conductivity. However, a problem with this manufacturing method is that if there is a variation in the thickness of the phenolic resin foamed molded product, the variation in thickness remains on the panel even if the metal steel plates are bonded together. In order to improve the thickness accuracy of the panel, the surface of the phenol resin foam molded body is ground and the thickness accuracy is improved, and then a method of bonding is practically taken, but it takes time and manufacturing cost. There are problems such as high. Also, when the metal steel plate is a corrugated corrugated sheet, it cannot be bonded as it is, so it is necessary to grind the phenolic resin foam molded body surface to match the concave and convex shape of the metal steel plate, which takes time and manufacturing cost. Get higher. In addition, the frame surrounding the panel has an arbitrary shape depending on the application, and in order to completely bond the gap between the frame and the phenolic resin foam molding, the periphery of the phenol resin foam molding is special. It is necessary to process into a shape, which is expensive and problematic.

Japanese Patent Laid-Open No. 02-043033 JP 02-043034 A Japanese Patent No. 3230207

In order to produce a metal composite panel having a low thermal conductivity by injecting a phenol resin foam composition into the panel, it is important how the condensed water generated by the curing reaction of the phenol resin is scattered outside the panel. Conventionally, it has been necessary to provide heating for a long time and a special drainage layer inside.
In addition, in order to manufacture a phenolic resin-filled metal composite panel having a good thickness accuracy by laminating a phenolic resin foam molding, the surface of the phenol resin foam molding is ground to increase the thickness accuracy of the phenol resin foam molding. Things were necessary. In addition, in order to bond a corrugated steel sheet with unevenness to a metal steel sheet, it was necessary to grind the surface of the phenolic resin foam molded body into a corrugated shape, which was very laborious.

As a result of intensive studies to solve the above problems, the present inventor has used a phenol resin foam molded body as a part of the phenol resin foam layer in the panel, thereby providing a phenol resin-filled metal with low thermal conductivity. A method for efficiently producing a composite panel has been found and the present invention has been achieved.
That is, the present invention
[1] In a panel having a metal plate on the surface and a phenol resin foam layer inside, the phenol resin foam layer is formed between the phenol resin foam molded body portion and the phenol resin foam molded body portion and the metal plate. And the surrounding phenol resin foamed part including at least both sides of the phenolic resin foamed molded part, and the metal plate and the phenolic resin foamed molded part are applied around the phenolic resin foamed molded part. A phenolic resin-filled metal composite panel, characterized by being bonded by a phenolic resin foam part,
[2] The phenol resin-filled metal composite panel according to [1], wherein the metal plate is a metal plate having an uneven surface.
Further, a panel made of a metal plate only on one side, or a metal plate with one side or both sides uneven.

The present invention can heat a phenol resin-filled composite metal panel with low thermal conductivity in a short time without causing most of the condensed water generated by the reaction of the moisture contained in the phenol resin and the phenol resin foaming composition to be emitted outside the panel. It is possible to manufacture.
Phenolic resin filler metal composite panels produced by the present invention has good good flatness thickness accuracy, while the metallic plate and a phenolic resin foamed molded, without using a special adhesive, the same phenolic resin The foamed composition itself is strongly foamed and self-adhered. The metallic plate can be easily manufactured even a wave plate of the irregularity.

  The present invention will be described below with reference to the procedure of the production method. A specific method for producing a phenolic resin-filled metal composite panel is to attach a frame to prevent leakage of phenol resin on a metal sheet that has been box-folded, and phenol resin / surfactant / foaming agent / catalyst inside. A phenol resin foam composition (hereinafter referred to as a phenol resin foam composition) made of a mixture of the above is poured, a phenol resin foam molding is placed thereon, and if necessary, a phenol resin foam composition is poured onto the foam composition, A metal plate that has been box-folded is put on the frame, and then sandwiched between heating presses, and the poured phenol resin foam composition is foam-cured and integrated. At this time, if a box-folded metal plate is not covered, a panel made of a single-sided metal steel plate can be obtained. In this case, it is not necessary to further pour the phenol resin foam composition thereon, and heating may be performed from the lower side. Details will be described below.

The material of the metallic plate as a surface material of the metal composite panels, aluminum, steel, stainless steel or the like can be used, the intended use, or to improve corrosion resistance applies various plating on the surface, the polyester in order to improve the aesthetic appearance Various steel plates coated with resin or the like are used. If necessary, the end of the metal plate is processed into a box shape or processed into a complicated arbitrary shape.
The frame provided around the metal steel plate is used to prevent leakage at the time of foaming of the phenol resin foam composition and to facilitate connection between panels at the time of metal composite panel construction. When the panel is used for heat insulation, it is preferable to use a material with low thermal conductivity in order to prevent thermal bridges on the front and back of the panel metal steel plate. The material is polystyrene resin, vinyl chloride resin, phenol resin, etc. A low foam molded article produced by foaming is preferable, and when nonflammability and heat resistance are required, a mixture of inorganic materials such as calcium carbonate is used. The outer shape of the frame is subjected to a jointing process or the like as needed to connect the panels.

The phenol resin foam composition is obtained by uniformly dispersing and mixing a surfactant, a foaming agent and a catalyst with a phenol resin. The phenol resin in the present invention is a resol type phenol resin synthesized with an alkali metal hydroxide or an alkaline earth metal hydroxide. The starting molar ratio of phenols to aldehydes in the phenolic resin used in the present invention is preferably from 1: 1 to 1: 4, more preferably from 1: 1.5 to 1: 1.25.
As the surfactant, those generally used for the production of phenol resin foam can be used, and among them, nonionic surfactants are effective. Examples include silicone surfactants such as polydimethylsiloxane, copolymers of ethylene oxide and propylene oxide, condensates of alkylene oxide and nonylphenol, and alkylphenols such as dodecylphenol. These surfactants may be used alone or in combination.

As the blowing agent used in the present invention, hydrocarbons such as normal pentane, isopentane, cyclopentane, normal butane, and isobutane may be used singly or in a blended form. The mixing ratio of the phenol resin and the foaming agent varies depending on the foaming conditions and the expansion ratio, but 2 to 15 wt% of the foaming agent is usually used with respect to the phenol resin.
The catalyst is not particularly limited, and aromatic sulfonic acids such as toluene sulfonic acid, xylene sulfonic acid, and phenol sulfonic acid can be used. These may be used alone or in combination of two or more. Moreover, these catalysts can also be used by diluting with a solvent such as diethylene glycol or ethylene glycol.
The amount of the catalyst used varies depending on the type and foaming conditions, but about 5 to 15% of the phenol resin is usually used.

The mixing method of a phenol resin, a foaming agent, and a catalyst is not specifically limited. A hand mixer, a continuous mixing type pin mixer, or the like may be used. The uniformly mixed phenol resin foam composition is first poured uniformly onto a metal steel plate constituting the lower surface.
If the method of continuously pouring the phenolic resin foam composition while moving the metal steel sheet, it can be poured uniformly and continuously, but if there is no continuous device, after pouring a predetermined amount of the phenolic resin foam composition Alternatively, a method of uniformly stretching with a brush or a spatula may be used to obtain a uniform thickness. After the phenol resin foam composition is uniformly poured onto the metal steel plate, the phenol resin foam molded article is placed thereon.

  The phenol resin foam molded article is preferably a phenol resin foam molded article having low thermal conductivity and little change in thermal conductivity even when it absorbs moisture. Moreover, it is preferable to use a phenol resin foam molding in the absolutely dry state. For example, the phenolic foam manufactured by Asahi Kasei Construction Materials Co., Ltd. is a collection of small bubbles, each of which is an independent cell (closed cell), in which gas that is difficult to transfer heat is contained. ing. Therefore, the heat conductivity is as low as 0.020 w / mk, and the heat insulation value is extremely low. Even when moisture is absorbed, the change in the heat conductivity value is small, and the performance is maintained for a long time. Therefore, it is a very preferable phenolic resin foam molding.

  The thickness of the phenolic resin foam molded body used in the present invention is preferably 50% to 95% of the total thickness of the metal composite panel, more preferably 80% to 95%. It is preferable to adjust the thickness of the phenol resin foam molded body so that the gap between the metal steel plate and the phenol resin foam molded body, that is, the phenol resin foam composition layer is about 3 to 5 mm. If the proportion of the phenol resin foam molding is small, a large amount of the phenol resin foam composition is required, the condensed water generated by the reaction of the phenol resin inevitably increases, and the water accumulated in the metal panel increases. The thermal conductivity of the phenol resin foam layer is increased. For this reason, in order to express the desired low thermal conductivity, it takes a long heating time for draining water, and the productivity is lowered. Therefore, the proportion of the phenol resin foam molding is larger. preferable.

Moreover, the size of the phenol resin foamed molded article is good enough to leave a gap of about 3 to 5 mm from the inside of the frame. When the gap is too narrow, the phenolic resin foam composition does not flow, and a void is formed. Therefore, in order to completely foam and bond the frame and the phenolic resin foam molded body, it is preferable to provide a gap of about 3 to 5 mm.
Next, the phenol resin foam composition is poured again into the upper surface of the placed phenol resin foam molding or the inside of the metal steel plate to be covered on the upper surface. The pouring method is performed in accordance with the pouring method to the lower surface metal steel plate described above.

  Thereafter, a metal steel plate for the upper surface is placed on the frame. The phenolic resin foam composition may be poured on the inside after covering the upper surface with a metal steel plate for the upper surface. Then, the phenol foamed resin composition sandwiched and poured by a heating press is foam-cured and integrated under a predetermined temperature condition. Although the heating temperature and heating time vary depending on the reactivity of the phenol resin and the amount of catalyst, etc., if the general heating temperature is around 80 ° C. and the heating press time is about 20 to 60 minutes, it is completely foamed and cured. Is completed. The metal composite panel manufactured by this method has low thermal conductivity, and the phenolic resin foam molding and the metal steel plate are completely self-foamed and bonded with the phenolic resin foam composition. The property is also good. Although the description of this manufacturing means has explained the method of having a flat metal plate on both sides, it is possible to use a corrugated steel plate with one or both sides being uneven. If a box-folded metal plate is not covered, a panel made of a single-sided metal steel plate can be obtained. In this case, it is not necessary to further pour the phenol resin foam composition thereon, and heating may be performed from the lower side. In a metal composite panel made of a single-sided metal plate, a double-sided metal plate can be obtained by further bonding the metal plate to the back side. It is also possible to form a double-sided metal plate by bonding metal composite panels made of single-sided metal plates.

Examples and Comparative Examples

  The present invention will be described based on examples and comparative examples.

[Example 1]
The end of a 0.4 mm thick metal flat steel plate is box-folded to prevent leakage of the phenolic resin foam composition around the metal steel plate (width 90 cm, length 180 cm, depth 1 cm) formed into a bento box shape For this purpose, a low-foam polystyrene frame (thickness 5 cm, width 2 cm) was adhesively fixed with tape, and then 30 g of acid catalyst was uniformly added to a mixture of 500 g of phenol resin and 30 g of normal pentane as a blowing agent. The phenol resin foam composition obtained by mixing was poured into a metal steel plate and applied uniformly using a plastic spatula. On top of that, a phenolic resin foam molded body of Asahi Kasei Construction Materials Co., Ltd. was placed as a phenolic resin foam molded body. The used phenol resin foam molded article had a density of 27 kg / m ³ and a thermal conductivity of 0.0204 w / mk. The phenol resin foam molded article was placed on a phenol resin foam composition into which an article having a width of 85 cm, a length of 175 cm, and a thickness of 4 cm was poured. Furthermore, a phenol resin foam composition obtained by mixing 30 g of an acid catalyst into a mixture of 500 g of a phenol resin and 30 g of normal pentane as a foaming agent in advance and mixing them uniformly is poured onto the phenol resin foam molded article. It applied so that it might become a uniform application quantity using a plastic spatula. Next, after covering the polystyrene frame with a metal plate, it was held for 1 hour with a heat press at 80 degrees to cure the phenolic resin foam composition. It was taken out from the heating press, the phenol resin foam in the metal panel was cut out, and when the thermal conductivity of the foam was measured, it was a low value of 0.024 w / mk. As for the cross section of the foam, there was a phenol foam molded body layer of 40 mm at the center, and a foam layer of 5 mm thickness was uniformly foamed on both sides, and a foam layer of 50 mm thickness was formed as a whole. .

[Comparative Example 1]
In order to prevent leakage of phenolic resin foam around the metal plate (width 90cm, length 180cm, depth 1cm) formed by bending the end of a 0.4mm-thick metal steel plate into a boxed box shape. After adhering and fixing a low foam frame (5 cm in height and 2 cm in width) with a double-sided tape, 150 g of acid catalyst was uniformly mixed with a mixture of 2500 g of phenol resin and 150 g of normal pentane as a foaming agent in advance. The resulting phenolic resin foam composition was poured into a metal box and applied uniformly using a plastic spatula. The metal steel plate was covered on the polystyrene frame, and then held for 1 hour with a heat press at 80 degrees to foam and cure the phenolic resin foam composition. It was taken out from the heating press, the phenol resin foam in the metal panel was cut out, and when the thermal conductivity of the foam was measured, it was 0.040 w / mk.
Compared with Example 1, the thermal conductivity was very high, and no satisfactory product was obtained.
As can be seen from the results of the above Examples and Comparative Examples, the use of the phenolic resin foam molded body of the present invention as a part of the phenolic resin foam layer in the panel makes it possible to reduce heat conductivity by heating in a short time. A phenol resin-filled metal panel can be easily manufactured.

  The present invention is used as a phenolic resin foam-filled heat insulating metal panel, as a wall heat insulating panel, roof heat insulating panel, indoor partition panel plate, outer wall panel, metal siding material, heat insulating siding material, clean room partition panel, refrigerator-freezer panel, etc. The

Schematic diagram of a cross-sectional structure of a phenolic resin-filled composite metal panel of the present invention

Explanation of symbols

1 Metal steel plate 2 Frame 3 Phenolic resin foam composition 4 Phenolic resin foam molding 5 Metal steel plate

Claims (2)

In a panel having a metal plate on the surface and a phenol resin foam layer inside, the phenol resin foam layer includes an internal phenol resin foam molded body portion, a portion between the phenol resin foam molded body portion and the metal plate, and the phenol. become the sides of the foamed resin molded body portion surrounding including at least a phenolic resin foam part, and the metal plate and the phenolic resin foamed molded part is coated the phenolic foam around the phenolic foam molded body A phenolic resin-filled metal composite panel characterized by being bonded to each other. The phenol resin-filled metal composite panel according to claim 1, wherein the metal plate is a metal plate having an uneven surface.

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