JP2009006566A - Method and facility for producing glass fiber-reinforced hard polyurethane foam - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method and facility for producing glass fiber-reinforced hard polyurethane foam, capable of further uniforming a finish thickness by further uniformly applying a foaming stock solution composition, compared with the related art. <P>SOLUTION: The method comprises lower facing material feeding step of feeding a lower facing material; loosening step of irregularly inflecting a glass fiber mat 6 by a loosening roller 5; glass fiber mat feeding step of feeding the loosened glass fiber mat 6 onto the lower facing material 1L; stock solution feeding step of feeding the foaming stock solution composition A onto the lower facing material; upper facing material feeding step of feeding an upper facing material 1U onto the foaming stock solution composition; and foaming step of foaming and hardening the foaming stock solution composition A to form a glass fiber-reinforced hard polyurethane foam B. The method further comprises flapping step of flapping the surface of the loosened glass fiber mat 6 after the loosening step. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention is a glass fiber reinforced rigid polyurethane foam, specifically as a thermal insulation panel for ultra-low temperature, particularly as a thermal insulation panel suitable for thermal insulation of a storage facility for storing LNG, liquefied helium, liquefied nitrogen and other low boiling point materials, particularly LNG. The present invention relates to a method for producing a glass fiber reinforced rigid polyurethane foam that can be used, and a facility for producing a glass fiber reinforced rigid polyurethane foam suitable for carrying out the method.

  Hard polyurethane foam reinforced with glass fibers that can be suitably used as an insulation material for ultra-low temperatures (hereinafter sometimes abbreviated as RPUF) generally has a glass fiber mat placed on the bottom material and is hard It is manufactured by a method of supplying and impregnating a foaming stock solution composition for forming a polyurethane foam and then supplying an upper surface material, followed by nipping with a nip roll, reacting and foaming.

  A technique for producing a glass fiber reinforced rigid polyurethane foam by supplying a plurality of glass fiber mats during production is known (Patent Document 1). Patent Document 1 discloses a technique for lifting a glass fiber mat in accordance with the progress of foaming to reduce non-uniformity of glass fibers.

  In the glass fiber reinforced rigid polyurethane foam, the continuous strand mat that is most commonly used because of its excellent reinforcing property is that one or a plurality of continuous yarns meander at random in the width direction. It is configured to have a basis weight, and is supplied as a commercial product in a state in which the intersection of yarns is bound with a binder to suppress the bulkiness in the thickness direction and wound in a roll shape. When such a continuous strand mat is used as a reinforcing glass fiber, in the invention described in Patent Document 1, although the distance between the glass fiber mats is uniform, the glass fibers constituting the individual glass fiber mats are still The glass fiber reinforced rigid polyurethane foam that does not spread uniformly in the thickness direction has a problem that a portion having a high glass fiber concentration and a portion having a low glass fiber concentration are formed in each glass fiber mat layer.

When manufacturing glass fiber reinforced rigid polyurethane foam, there is also a technology that uses a loosening roller to loosen glass fiber mats such as continuous strand mats so that the glass fibers constituting each glass fiber mat spread uniformly in the thickness direction. Known (Patent Document 2).
JP 2001-150558 A JP 2005-178270 A

  The loosening roller disclosed in Patent Document 2 is composed of a first roller and a second roller, and a plurality of disc bodies are intermittently arranged on the rotation shafts, respectively. Two-roller discs are alternately arranged to form overlapping portions when viewed in the axial direction. When the glass fiber mat is supplied between the two rollers having such a structure, the glass fiber mat is bent and deformed by the action of the disc body of the first roller and the disc body of the second roller, and the binding of the binder is released. Is done.

  However, if the uneven wavy shape generated in this unraveling process remains at the time of injection of the foaming stock solution composition, the applied foaming stock composition is not uniformly applied, and as a result, the glass fiber reinforced rigid polyurethane having a uniform thickness No form can be obtained.

  The present invention provides a method for producing a glass fiber reinforced rigid polyurethane foam and a method for producing a glass fiber reinforced rigid polyurethane foam in which the foamed stock solution composition is more uniformly applied and the finished thickness becomes more uniform as compared with the prior art. The purpose is to provide equipment.

In order to solve the above problems, a method for producing a glass fiber reinforced rigid polyurethane foam according to the present invention,
A lower surface material supplying step for supplying the lower surface material, a unraveling step for bending the glass fiber mat in an uneven shape by a loosening roller, a glass fiber mat supplying step for supplying the unraveled glass fiber mat onto the lower surface material, and on the lower surface material A stock solution supplying step of supplying a foamed stock solution composition, a top surface material supplying step of supplying a top material onto the foamed stock solution composition, and a foaming step of foaming and curing the foamed stock solution composition to form a glass fiber reinforced rigid polyurethane foam Have
After the unraveling step, the method further comprises a step of hitting the surface of the unraveled glass fiber mat.

  The operation and effect of the manufacturing method of the glass fiber reinforced rigid polyurethane foam having this configuration will be described. According to this configuration, it has a step of bending the glass fiber mat into a concavo-convex shape by a loosening roller, whereby the glass fiber mat is compressed and gripped, and the binding by the binder at the intersection of the yarns is released. The uniformity of the glass fibers in the thickness direction of the polyurethane foam can be improved. In addition, the glass fiber mat is bent into a concavo-convex shape by the unraveling process, but the surface of the unraveled glass fiber mat is struck by the knocking process thereafter. By this step, the uneven shape can be made flat. Since the foaming stock solution composition is supplied after performing such a tapping process, the foamed stock solution composition is more uniformly applied, and the finished thickness becomes more uniform. Can be manufactured.

  In the present invention, it is preferable to hit the surface of the glass fiber mat with a hitting member having a hitting surface formed on a flat surface. By using such a striking member, it is possible to efficiently make the uneven shape into a flat shape.

In order to solve the above problems, the production equipment for glass fiber reinforced rigid polyurethane foam according to the present invention is:
A lower surface material supply device for supplying a lower surface material, a unraveling device for bending the glass fiber mat into an uneven shape by a unwinding roller, a glass fiber mat supply device for supplying the unraveled glass fiber mat onto the lower surface material, and on the lower surface material Stock solution supply device for supplying foamed stock solution composition, top surface material supply device for feeding top material onto foamed stock solution composition, and foaming device for foaming and curing foamed stock solution composition to form glass fiber reinforced rigid polyurethane foam Have
It further has a device which taps the surface of the glass fiber mat which has been unraveled by the unraveling device.

  The operation and effect of the production facility for glass fiber reinforced rigid polyurethane foam having such a configuration is as described above. That is, the surface of the glass fiber mat that has been loosened can be struck by the tapping device, and the uneven shape can be made flat. Since the foaming stock solution composition is supplied after performing such a tapping process, the foamed stock solution composition is more uniformly applied, and the finished thickness becomes more uniform. Can be manufactured.

  The hitting device according to the present invention preferably includes a hitting member having a hitting surface formed in a plane. By using such a striking member, it is possible to efficiently make the uneven shape into a flat shape.

  A manufacturing apparatus and a preferred embodiment suitable for carrying out the present invention will be described with reference to the drawings. FIG. 1 shows a schematic configuration of a manufacturing apparatus suitable for carrying out the present invention and a manufacturing method using the manufacturing apparatus. In this example, flexible face materials are used for both the upper and lower double-sided materials, and three layers of glass fiber mats are supplied.

  The lower surface material 1L is supplied from the lower surface material supply device 2L onto the conveyors 3 and 4 (lower surface material supply process), and the three-layer glass fiber mat 6 (6a, 6b, 6c) is used as a reinforcing glass fiber material thereon. Are continuously unwound from the raw fabric, supplied and placed (glass fiber mat supplying step), and the rigid polyurethane foam foam concentrate solution A supplied from the head 7 (stock solution feeder) of the foaming machine is cast by the casting method. After the supply (raw solution supply process), the upper surface material 1U is continuously supplied from the upper surface from the upper surface material supply device 2U to form a sandwich (upper surface material supply process). After sufficiently impregnating the fiber mat (nipping step), the fiber mat is sent to a heating oven 10 (foaming device) equipped with a conveyor 9 and foamed and cured (foaming process). ) To produce a glass fiber reinforced rigid polyurethane foam B.

  The rigid polyurethane foam is formed by using a known rigid polyurethane foam stock solution having excellent low-temperature insulation performance. The rigid polyurethane foam stock solution uses a component containing an active hydrogen-containing compound, a foaming agent, a catalyst, etc. (polyol component) and a component mainly composed of a polyisocyanate compound (isocyanate component), and a polyol using a foaming machine. The component and the isocyanate component are mixed and used for forming a glass fiber reinforced rigid polyurethane foam as a foamed stock solution composition.

  When the glass fiber mat 6 (6a, 6b, 6c) is rewound from the original fabric and supplied, the glass fiber mat 6 (6a, 6b, 6c) is unraveled by the unraveling roller 5 (5a, 5b, 5c) (unraveling device).

  In FIG. 1, an example of loosening individual glass fiber mats rewound from the original fabric is shown. However, a plurality of glass fiber mats may be loosened with a single loosening roller, and a pair of glass fiber mats are paired. Unwinding with a unwinding roller is preferable because of its high unwinding effect.

  The tapping device 11 is a device that performs the action of tapping the surface of the glass fiber mat that has been unraveled by the unraveling roller 5, and aims to flatten the glass fiber mat 6 that has been bent into an uneven shape by the unraveling roller 5. This is a device. In FIG. 1, three layers of glass fiber mats 6 are hit together, but three hitting devices 5 may be provided to tap each glass fiber mat 6a, 6b, 6c individually. Whether the three layers are loosened together or individually can be selected as appropriate.

  The number of layers of the glass fiber mat to be used is appropriately set in consideration of the thickness of the foam to be produced, the required strength, the thickness and basis weight of the glass fiber mat to be used, etc., but generally about 2 to 7 layers It is. The glass fiber content of the glass fiber reinforced rigid polyurethane foam is preferably 5 to 20% by weight.

  The glass fiber material to be used is preferably a glass fiber having a large aspect ratio. Examples of suitable material include a long glass fiber mat-like product, specifically, a chop strand mat, a continuous strand mat, and the like. The continuous strand mat is most preferably used because of its excellent impregnation property and foam reinforcement property of the rigid polyurethane foam foam stock solution composition.

  As the face material used in the present invention, a known face material can be used without limitation. Specifically, a well-known flexible surface material such as a paper surface material, a resin-laminated paper surface material, an aluminum sheet, a steel plate, and a resin film is exemplified and can be used without limitation, but the physical strength of the sheet itself is good, Kraft paper, aluminum sheet, glass cloth, resin coating layer due to reasons such as that it does not corrode even when condensed water is generated when used in highly heat-insulating applications, and has good reaction adhesive strength with rigid polyurethane foam. The use of a composite material such as kraft paper with the Since such an aluminum sheet composite face material does not have any organic compound permeability, the glass fiber reinforced rigid polyurethane foam obtained by using the aluminum sheet composite face material is particularly suitable as a heat insulating material for an LNG storage tank. Further, when only the core portion is cut out and used, the face material is discarded. Therefore, it is preferable to use an inexpensive face material.

  When a releasable face material such as release paper or release film is used, the skin surface of the glass fiber reinforced polyurethane foam formed by peeling and removing the releasable face material is adhered to another rigid polyurethane foam. Is possible.

<Composition of the loose roller>
FIG. 2 and FIG. 3 exemplify a part of the configuration of the loosening roller 5 (relaxing device). In the loosening roller 5, a first roller 50 a and a second roller 50 b are arranged on a frame 50 in parallel using a bearing 51. The disc body 52a is intermittently disposed on the first roller 50a, and the disc body 52b is intermittently disposed on the second roller 50b. The disc body 52a of the first roller 50a and the circle of the second roller 50b. The plate bodies 52b are alternately arranged and are configured to have overlapping portions when viewed in the axial direction.

  In the example shown in FIG. 3, a drive motor 53 is connected to the first roller 50a. There are no particular limitations on the size (diameter), spacing, and overlap size of the discs disposed intermittently, and the thickness and type of glass fiber mat to be loosened (glass fiber) The thickness is appropriately set according to the thickness of the image. In the example shown in FIGS. 2 and 3, it is preferable that at least the second roller 50b is configured to be able to change the fixing position to the frame 50 so that the distance from the first roller 50a can be changed.

  The disc bodies 52a and 52b may be discs having a uniform thickness or may be discs having a thick thickness in the central direction, but a disc having a uniform thickness is easy to manufacture. It is preferable. The disc bodies 52a and 52b preferably have chamfered chamfers at the peripheral edge portions, or have a circular arc shape at the entire peripheral edge portion, so that the glass fiber mat 6 is not damaged during bending deformation. .

  A situation where the glass fiber mat 6 is loosened by using the loosening roller 5 is shown by an imaginary line in FIG. When the glass fiber mat 6 supplied in the form of a flat sheet is loosened and passed through the roller 5, the disc body 52a that is alternately and intermittently disposed on the two rollers and has overlapping portions as viewed in the axial direction. 52b, the glass fiber mat 6 is bent and deformed in a zigzag shape, and the binding of the yarns constituting the glass fiber mat 6 is eliminated and the glass fiber mat 6 is in a fluffy state. The glass fiber from which the binding has been eliminated spreads uniformly in the thickness direction of the rigid polyurethane foam as the foaming progresses.

<Configuration of the tapping device>
Next, the configuration of the hitting device 11 will be described with reference to FIGS. The glass fiber mat 6 is formed in a corrugated shape by the loosening roller 5 as shown in FIG. If it is sent to the foaming process with this uneven shape remaining, it becomes difficult to form a rigid polyurethane foam having a uniform thickness. Therefore, it is necessary to level the uneven shape, and for this purpose, a tapping device 11 is provided. ing. After leveling by the hitting device 11, the foaming stock solution composition is supplied by the head 7.

  The hitting device 11 includes a square pipe 11a as a hitting member. The square pipe 11a is a pipe material having a square or rectangular cross-sectional shape, and includes a flat tapping surface 11b. The material of the square pipe 11a is not particularly limited, but iron or aluminum that is difficult to catch glass fibers is preferable.

  The square pipe 11a can be driven by an air cylinder 11c in the vertical direction, and the air cylinder 11c is supported by a support base 11d. The square pipe 11a is controlled so as to be reciprocally driven in the vertical direction. For driving the square pipe 11a, an actuator other than the air cylinder 11c may be used. The width dimension of the square pipe 11a can be appropriately set according to the size of the polyurethane foam to be manufactured.

  The hitting depth when hitting with the square pipe 11a can be appropriately set based on the corrugated wave shape, the thickness of the glass fiber mat 6, and the like. In addition, an appropriate value can be set for the number of hits or the hit period in consideration of the size of the square pipe 11a.

<Another embodiment>
The hitting device 11 is provided only at one location in the conveying direction of the glass fiber mat 6, but may be configured to be provided at a plurality of locations and tapped a plurality of times. The hitting member may be a hit using, for example, a plate-like member instead of the square pipe 11a. The hitting member is not limited to the square pipe 11a described above, and various modifications are possible. For example, if it is square, it does not need to be a pipe. A plurality of round pipes may be arranged side by side.

Front view illustrating production equipment for glass fiber reinforced rigid polyurethane foam The perspective view which shows the structure of a loosening roller and a hitting device Diagram showing the configuration of the loosening roller Diagram showing the configuration of the tapping device

Explanation of symbols

A Foam Stock Solution B Glass Fiber Reinforced Hard Polyurethane Foam 1L Bottom Material 1U Top Material 5 Unraveling Roller 6 Glass Fiber Mat 7 Mixing Head 10 Heating Oven 11 Tapping Device 11a Square Pipe 11b Tapping Surface 11c Air Cylinder 50a First Roller 50b Second Rollers 52a and 52b

Claims (4)

A method for producing a rigid polyurethane foam containing long glass fibers,
A lower surface material supplying step for supplying the lower surface material, a unraveling step for bending the glass fiber mat in an uneven shape by a loosening roller, a glass fiber mat supplying step for supplying the unraveled glass fiber mat onto the lower surface material, and on the lower surface material A stock solution supplying step of supplying a foamed stock solution composition, a top surface material supplying step of supplying a top material onto the foamed stock solution composition, and a foaming step of foaming and curing the foamed stock solution composition to form a glass fiber reinforced rigid polyurethane foam Have
A method for producing a glass fiber reinforced rigid polyurethane foam, comprising a step of tapping the surface of the unraveled glass fiber mat after the unraveling step.   2. The method for producing a glass fiber reinforced rigid polyurethane foam according to claim 1, wherein the surface of the glass fiber mat is hit by a hitting member having a hitting surface formed in a plane. A manufacturing facility for rigid polyurethane foam containing long glass fibers,
A lower surface material supply device for supplying a lower surface material, a unraveling device for bending the glass fiber mat into an uneven shape by a unwinding roller, a glass fiber mat supply device for supplying the unraveled glass fiber mat onto the lower surface material, and on the lower surface material Stock solution supply device for supplying foamed stock solution composition, top surface material supply device for feeding top material onto foamed stock solution composition, and foaming device for foaming and curing foamed stock solution composition to form glass fiber reinforced rigid polyurethane foam Have
The apparatus for producing glass fiber-reinforced rigid polyurethane foam, further comprising a device for hitting the surface of the glass fiber mat loosened by the unwinding device.   The said hitting apparatus is provided with the hitting member which has the hitting surface formed in the plane, The manufacturing equipment of the glass fiber reinforced rigid polyurethane foam of Claim 3 characterized by the above-mentioned.

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