JP2008093895A - Method for producing insulating composite panel for membrane type tank and laminated base material for prepreg of sheet-like bulkhead material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve the production efficiency of a prepreg production process by making a process for impregnating a prepreg base material with a resin material as simple as possible, and to improve the adhesion between aluminum foil and the prepreg to form a prepreg laminate for a sheet-like bulkhead material improving the strength of the bulkhead material, or a method for producing an insulating composite panel for a membrane type tank. <P>SOLUTION: In a laminated base material 2 for the prepreg of the sheet-like bulkhead material 1, both sides of the aluminum foil 4 are covered with a glass cloth 6 through an epoxy resin-based adhesive layer 5 applied by a dry lamination method, and they are integrated. The prepregs can be set on both sides of the aluminum foil by one impregnation with the resin material 7. Therefore, both of adhesive strength by the resin material 7 and an adhesive effect by the adhesive layer 5 are developed. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a method for producing a heat-insulating composite panel used for a thermal barrier of a membrane-type tank of a ship for transporting liquefied natural gas, and a laminate base for a prepreg of a sheet-like barrier material used as a material for the heat-insulating composite panel for a membrane-type tank Regarding materials.

Generally, liquefied natural gas (hereinafter abbreviated as LNG) has a light physical property with a specific gravity of less than 0.5, and therefore requires a tank having a relatively large capacity in order to load a predetermined weight on a ship or the like.
LNG is a liquid having an extremely low boiling point of -163 ° C at normal pressure, so that the tank is composed of a strong heat barrier that can withstand extremely low temperatures and withstand heat loads for its transportation and storage. There is a need to.

  As a typical type of a tank for a transport ship that transports a large amount of such a cryogenic liquid such as LNG, an independent tank and a membrane (thin film) tank are known (see Patent Document 1).

  The membrane tank is superior in that a larger tank volume can be secured in accordance with the shape of the hull than an independent tank provided independently of the hull structure, and the tank weight is light.

  4 and 5 and the laminated structure (example) shown in FIG. 3, the membrane tank 11 of the liquefied natural gas transport ship 24 applies the load of LNG to the inner shell of the hull. A double deck structure is provided between the tank periphery and the inner hull of the hull so that it can be supported and as much tank capacity as possible can be secured, and heat insulation, liquid tightness and air tightness are maintained. A thermal barrier 14 composed of a primary thermal barrier 13 and a secondary thermal barrier 12 covered with 10 or the like is installed, and hydrostatic or hydrodynamic force is distributed and transmitted to the hull through these. In addition, a structure for safely keeping LNG cold is adopted.

  The secondary thermal barrier 12 of the membrane tank 11 is made of a glass fiber reinforced rigid polyurethane foam 8 on an air-tight and liquid-tight barrier material (part indicated by reference numeral 1 in the embodiment) in which an aluminum foil and a glass cloth are overlapped. And a heat insulating composite panel in which the plywood 9 is further stacked and integrated.

  As shown in FIG. 4, the barrier material has a laminated structure in which two glass cloths 21 are stacked on the front and back surfaces of the aluminum foil 20. The glass cloth prepreg 22 is semi-cured by impregnating the entire glass cloth 21 with an epoxy resin. And is cured by being heated and pressed (pressed in the direction of the arrow shown in FIG. 4) on both sides of the aluminum foil 20 and coated on both sides with a glass fiber reinforced epoxy resin layer. .

Japanese Patent No. 2754174 (see paragraph numbers [0003] and [0004])

  However, the above-described conventional barrier material is manufactured by stacking a glass cloth prepreg impregnated with an epoxy resin on one or both sides of an aluminum foil and curing it by heating and pressing (hot pressing). Two sheet-like prepreg base materials are impregnated with a resin material to produce a prepreg, and thereafter, it is necessary to apply heat and pressure after overlapping the both surfaces of the aluminum foil.

  Moreover, it has been difficult to ensure sufficient strength for bonding the aluminum foil and the glass cloth only with the adhesive force of the prepreg resin impregnated in the prepreg base material.

  Accordingly, an object of the present invention is to manufacture a thermal barrier for a membrane type tank that solves the above-described problems, simplifies the process of impregnating the resin material into the prepreg base as much as possible, and improves the production efficiency of the prepreg manufacturing process. It is a method or a prepreg laminate of a sheet-like barrier material that improves the strength of the barrier material by improving the adhesive force between the aluminum foil and the prepreg.

  In order to solve the above-mentioned problems, in the present invention, for a prepreg of a sheet-like barrier material in which a prepreg base material made of a nonwoven fabric or a woven fabric is laminated and bonded to one or both sides of an aluminum foil via an adhesive layer Heat insulation for membrane type tanks, comprising providing a laminated base material, manufacturing a prepreg laminated body by impregnating the laminated prepreg base material with a resin material, and then stacking and integrating the prepreg laminated body on a rigid polyurethane foam This is a method for producing a conductive composite panel.

  According to the manufacturing method according to the present invention comprising the steps described above, since the prepreg base material and the aluminum foil are integrated through an adhesive, the prepreg is stronger than the integration with the aluminum foil using only the conventional prepreg. Become a laminate. In addition, since two prepreg laminate substrates can be placed on the front and back of an aluminum foil and impregnated with a resin material, it can be made into a prepreg at a time, so the production efficiency of the prepreg manufacturing process is improved by reducing the number of processes, and the aluminum foil The adhesive strength of the prepreg can be improved, and a membrane type tank thermal barrier can be easily manufactured.

  Further, in order to solve the above-mentioned problem of improving the strength of the barrier material, it comprises a laminated base material for a prepreg of a sheet-like barrier material that is integrated with a rigid polyurethane foam that constitutes a heat insulating wall of a membrane type tank. Since the laminated base material is a laminated base material for a prepreg of a sheet-like barrier material made by laminating and integrating a prepreg base material made of a nonwoven fabric or a woven fabric on both sides of an aluminum foil with an adhesive layer interposed therebetween. is there.

  The laminated base material for a prepreg of the sheet-like barrier material of the present invention configured as described above is a prepreg base material made of a nonwoven fabric or a woven fabric in advance through an adhesive layer on both the front and back surfaces of an aluminum foil before prepreg formation. Are bonded and integrated.

  In this way, the prepreg can be provided on both the front and back surfaces of the aluminum foil by a one-step impregnation treatment in which the prepreg laminated substrate is immersed in the resin material for prepreg formation. Both of the adhesive strengths due to are combined and firmly integrated.

  That is, the prepreg base material and the aluminum foil are integrated through an adhesive, and are laminated and integrated with a stronger adhesive strength than that of an aluminum foil using only a conventional prepreg, and in the prepreg manufacturing process. Production efficiency is improved.

As described above, the present invention provides a prepreg laminate of a sheet-like barrier material in which a prepreg base material and an aluminum foil are integrated with each other through a predetermined adhesive. Since the prepreg can be simply provided on both the front and back surfaces of the foil, there is an advantage that the production efficiency of the prepreg manufacturing process is improved.
Moreover, by using such a prepreg laminate of sheet-like barrier material, the adhesive force between the aluminum foil and the prepreg is improved by the adhesive, and there is an advantage that the strength of the barrier material is improved.

  And it becomes a method which can manufacture efficiently the heat insulation wall for membrane type tanks which improved the intensity | strength by using the prepreg laminated body of the sheet-like barrier material which has said advantage.

Embodiments of the present invention will be described below with reference to the accompanying drawings.
As shown in FIGS. 1 to 3 and 5, the heat insulating composite panel 3 for the membrane type liquefied natural gas tank and the barrier material 1 as the material thereof are arranged inside the membrane type tank 11 of the liquefied natural gas transport ship 24 (FIG. 5). It is used as a composite material of the heat insulating wall 13 covering. That is, the heat insulating composite panel 3 is configured as a composite of the liquid-tight and air-tight barrier material 1 and the glass fiber reinforced rigid polyurethane foam 8 integrated therewith.

  As shown in FIG. 1, the prepreg laminated base material 2 of the sheet-like barrier material 1 of the first embodiment is dry (dry type) through an epoxy resin adhesive layer 5 applied to both front and back surfaces of an aluminum foil 4. A glass cloth 6 is laminated and integrated by a laminating method.

  As shown in FIG. 1A, in order to apply the adhesive to the surface of the aluminum foil 4, for example, a liquid polyurethane adhesive dissolved in a solvent is applied or brushed using a brush or a roller. The adhesive layer 5 having a uniform thickness is provided by a known dry (dry) laminating method.

  The aluminum foil 4 used for the barrier material 1 is a metal material that is lightweight and excellent in airtightness, and may be, for example, about 70 μm thick and is a main component of natural gas. What is necessary is just to employ | adopt selectively what consists of a well-known pure aluminum or aluminum alloy with a good low temperature tolerance so that a brittle fracture may not be caused at the liquefaction temperature (-162 degreeC) of a certain methane gas.

  Next, as shown in FIG. 1 (b), the glass cloth 6 as a prepreg base material is superposed on the adhesive layer 5 provided on both the front and back surfaces of the aluminum foil 4, and is heated under pressure to be bonded and integrated for use in the prepreg. The laminated base material 2 is manufactured.

  Although the illustrated prepreg base material is a single woven fabric such as glass cloth, it may be a non-woven fabric or a woven fabric, and the material of these fibers is strong and flexible even at low temperatures, and corroded. It is preferable to use inorganic fibers such as carbon fibers in addition to glass fibers.

The glass cloth used in the embodiment employs a cloth-like material woven with strands for FRP. The weaving method of the glass cloth is not particularly limited. For example, a plain woven glass cloth (200 to 400 g / m ² ) is adopted, and a preferable result is obtained.

  Next, as shown in FIG. 1B to FIG. 1C, the prepreg laminated base material 2 is impregnated with the resin material 7 to form a prepreg, and this is heated and pressurized to produce the barrier material 1.

  As the resin material 7 used for the impregnation, an epoxy resin is applied, and a phenol resin, a melamine resin, or the like can also be used.

  The barrier material 1 obtained in this way is combined with a panel-like glass fiber reinforced rigid polyurethane foam 8 to form a heat insulating composite panel 3, and a plywood 9 is bonded and integrated to form a secondary thermal barrier 12.

And when installing inside the membrane tank 11 of the ship for transporting liquefied natural gas, a rope-like resin 15 is laid as an adhesive that serves both as a landing adjustment and insulation on the outermost side, and a secondary heat insulation is provided thereon. A primary heat insulating wall 13 is provided on which a wall 12 is placed, and a glass fiber reinforced rigid polyurethane foam 8 ′ is laminated and integrated with a plywood 9 ′ thereon.
The primary thermal barrier 13 and the secondary thermal barrier 12 are integrated with an adhesive to form the thermal barrier 14, and the surface of the thermal barrier 14 that is in contact with the cryogenic LNG is, for example, 0.7 mm thick. A nickel (36%) steel plate 10 having a small heat absorption rate is coated.

In the second embodiment shown in FIGS. 2A, 2B, and 2C, the nonwoven fabric 16 is used in place of the glass cloth used in the first embodiment described above, and the barrier material 19 is composed of seven layers. is there.
That is, as shown in FIG. 2 (a), the nonwoven fabric 16 is dry-laminated on the aluminum foil 4 with the adhesive layer 5 interposed therebetween, and as shown in FIG. 2 (b), the nonwoven fabric is impregnated with a resin and laminated for prepreg. After the base material 17 is formed, the glass cloth 18 is overlapped on the front and back surfaces and heated and pressed to provide the barrier material 19.

  Thus, in the first and second embodiments, when the prepreg for the barrier material is manufactured, the resin material 7 can be impregnated at a time on both the front and back surfaces of the aluminum foil 4 to easily provide the prepreg. In addition, since the aluminum foil 4 and the prepreg have a strong adhesive effect not only with the resin material but also with the adhesive, peeling between the layers is sufficiently prevented.

  In Embodiments 1 and 2 described above, a nickel steel plate (flat plate) having a low heat absorption rate is used for the surface of the primary heat barrier, but instead of this, a lattice-like shape called corrugation is used for the primary heat barrier. An embodiment may be provided in which pleats are formed, thereby absorbing thermal fluctuations such as cooling heat and expansion and contraction due to hull deformation during voyage.

(A) Cross-sectional view just before bonding and integration of the barrier material of the first embodiment, (b) Cross-sectional view after bonding and integration of the barrier material of the first embodiment, (c) Use of the barrier material of the first embodiment Sectional view of an insulated composite panel (A) A cross-sectional view immediately before bonding and integration of the barrier material of the second embodiment, (b) a cross-sectional view after bonding and integration of the barrier material of the second embodiment, and (c) a barrier material of the second embodiment is used. Sectional view of an insulated composite panel The perspective view of the partial cross section of the heat insulation wall using embodiment Explanatory drawing which shows the manufacturing process of the barrier material of a prior art example (A) Explanatory drawing of ship for transporting liquefied natural gas, (b) Cross section of ship showing membrane type tank

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 19 Barrier material 2, 17 Laminated base material 3 for prepregs 3 Thermal insulation composite panel 4, 20 Aluminum foil 5 Adhesive layer 6, 18, 21 Glass cloth 7 Resin material 8 Glass fiber reinforced rigid polyurethane foam 9 Plywood 10 Nickel steel plate 11 Membrane type tank 12 Secondary thermal barrier 13 Primary thermal barrier 14 Thermal barrier 15 Rope-like resin 16 Non-woven fabric 22 Glass cloth prepreg 24 Ship for transporting liquefied natural gas

Claims (2)

  A laminated prepreg substrate of a sheet-like barrier material in which a prepreg substrate made of a nonwoven fabric or a woven fabric is laminated on one or both sides of an aluminum foil with an adhesive layer interposed therebetween is provided, and the prepreg laminated substrate is provided on the prepreg laminated substrate. A method for producing a heat insulating composite panel for a membrane-type tank, comprising impregnating a resin material to produce a prepreg laminate, and then stacking and integrating the prepreg laminate on a rigid polyurethane foam. It consists of a prepreg laminated base material of sheet-like barrier material that is integrated over the rigid polyurethane foam that constitutes the thermal barrier of the membrane tank,
This laminated base material is a laminated base material for a prepreg of a sheet-like barrier material, in which a prepreg base material made of a nonwoven fabric or a woven fabric is laminated and integrated on both front and back surfaces of an aluminum foil via an adhesive layer.

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