JP2006152605A - Photocurable prepreg sheet and heat-insulating and waterproof construction method using it - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a prepreg sheet whose shape can be maintained, without making the prepreg sheets adhere to each other, even if the prepreg sheets are stacked or stored as a wound body like a roll, and a heat-insulating and waterproof construction method which simplifies a conventional heat-insulating and waterproof construction method for a roof floor etc. by using the prepreg sheet, which reduces working steps and working time by dispensing with the separate preparation of a skeleton member such as a grass fiber etc. and which can bring about an effect similar to a conventional one. <P>SOLUTION: The prepreg sheet is constituted by making a fiber sheet 3 adhere onto a prepreg tape body 2. In the heat-insulating and waterproof construction method, a heat-insulating and waterproof panel is spread over a construction surface, and a gap between the panels is filled with the prepreg sheet and a liquid resin so as to be put into a solidified state. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a photocurable prepreg sheet and an improvement of a heat insulating waterproofing method such as a rooftop using the sheet.

[Background 1]
In recent years, photocurable prepreg sheets (hereinafter abbreviated as prepreg sheets) have been used as FRP (fiber reinforced plastic) products and parts for repairing and reinforcing dents, cracks, cracks, etc., or as lining materials for waterproofing. Yes.
This prepreg sheet is a peelable plastic on both sides of a prepreg tape body that becomes a base material impregnated and thickened with a photocurable resin composition containing a photopolymerization initiator in a fiber reinforcement such as glass fiber and nonwoven fabric. A film (hereinafter abbreviated as “film”) is attached, and the resin component is stored in an uncured state.

  When using this prepreg sheet, the prepreg tape body exposed by peeling off the attached film is attached to and adhered to the adherend by pressure bonding or the like, and electromagnetic waves such as ultraviolet rays and sunlight are irradiated from above. Thus, the resin composition contained in the prepreg tape main body is photocured and solidified integrally with the adherend, and the adherend is reinforced or waterproofed.

This prepreg sheet has a viscosity of the resin that forms the prepreg sheet in order to improve the adhesion to the adherend and the adaptability to the shape of the adherend, which are necessary to enhance the reinforcement / repair strength and water tightness. Need to be low.
However, prepreg sheets obtained by reducing the viscosity of the resin can be stacked with a film interposed, or stored in a roll-shaped wound body, so that even at room temperature, deformation due to the weight of the sheet or impregnation from the side of the sheet Uncured uncured resin oozes out and the stacked sheets adhere to each other, especially in the case of a wound body, the prepreg sheet body due to the difference in the peripheral length of the film adhered to both sides of the prepreg sheet body Due to the formation of wrinkles and the like, the form of the sheet is difficult to maintain, handling is difficult, and furthermore, the handling workability is poor such as sticking to various people at the construction site.

Therefore, when the construction surface to which the prepreg sheet is applied is one that emphasizes the appearance or requires dimensional accuracy, a sheet or a wound sheet with the peelable film interposed therebetween is not suitable for use.
Therefore, for construction surfaces that require a high degree of appearance or dimensional accuracy, for example, a single sheet or a sheet-like prepreg tape that is protected by sticking a film to both surfaces of the prepreg tape body and processed into a predetermined size, The required number of cases sealed in a case is used. In use, the case is opened, the prepreg sheet is taken out, the film is peeled off, and the adherend is adhered to and adhered to the case.

[Background Technology 2]
In recent years, rooftop insulation and waterproofing methods, which are also called apex panel methods, are attracting attention as rooftop insulation and waterproofing methods for new or existing buildings, which are superior in heat insulation, waterproofing and durability, lightweight and strong. Reference 1).
In this construction method, first, an FRP molded insulation waterproof panel of 1m x 1m x 45mm thickness called apex panel is spread on the construction surface such as the rooftop, and fixed to the construction surface with anchors and fixed. The gaps between the panels are filled in the following procedure.

That is, as shown in FIGS. 3 and 4, a volatile liquid resin, which will be described later, flows into the lower side of the panel 11 so as to cover between the protruding edges 12 and 12 of the side surface of the panel 11 laid on the construction surface. After sticking and fixing the protruding edges 12 and 12 of the opposing panels 11 and 11 with the butyl rubber tape 10,
B) A volatile liquid resin 13 is applied from above the butyl rubber tape 10 so as to cover the edge of the panel 11.
B) Reinforcement fibers 14 such as glass fibers are spread on the application surface of the liquid resin 13.
C) A volatile liquid resin 13 is further applied and permeated from above the reinforced fiber 14 spread.
(D) Next, air bubbles remaining between the reinforcing fibers 14 are released by depressurization from above the applied liquid resin 13 by pressing with a roll brush.
1 ply is made by the procedures of a) to d), and usually 2 plies are finished.
Japanese Patent No. 3381063

As described above, in order to improve the adhesion to the adherend and the shape compatibility, the prepreg sheet reduces the viscosity of the resin forming the prepreg sheet. Sticks or becomes wrinkled, and it is difficult to maintain the form of the sheet. Therefore, a large number of prepreg sheets with low resin viscosity are stacked with a release film interposed, or a long wound body. I can't find anything.
Therefore, for the construction surface to which the prepreg sheet is applied, those that attach importance to the appearance, or those that require dimensional accuracy, a sheet-like prepreg sheet that is protected by sticking both sides with a film as described above I had to use it.

However, if a single-sheet prepreg sheet is used for a wide range of construction surfaces that emphasize external appearance or require dimensional accuracy, it must be removed from the case one by one and pasted on the construction surface. Therefore, the work cannot be rationalized and the cost is increased. Furthermore, the watertightness at the connection surface between the prepreg sheets may be reduced.
In addition, the conventional rooftop insulation waterproofing method described above is carried out according to the procedures (i) to (d) shown in [0007], and usually has two plies, so there are many work steps, the work time is long, and the cost is high. In addition, the installation of separately prepared reinforcing fibers and the application of the liquid resin to the reinforcing fibers have been difficult.

  Accordingly, one of the problems of the present invention is to maintain the form of the sheet without sticking to each other or causing wrinkles even if the prepreg sheet main body having a low resin viscosity is stacked or rolled. Further, it is to provide a prepreg sheet that can be applied to a wide range of construction surfaces requiring dimensional accuracy to improve workability. Another object of the present invention is to provide a conventional rooftop as described above. It is an object of the present invention to provide a heat-insulating and waterproofing method that simplifies the heat-insulating and waterproofing method such as the above, eliminates the need for separately preparing a skeleton member such as glass fiber, shortens the work process and the working time, and obtains the same effects as conventional ones.

In order to solve the above problems, the prepreg sheet of the present invention is formed by attaching a fiber sheet on a prepreg tape body. The fiber sheet is preferably formed so as to be wider than the prepreg tape body. In the prepreg sheet of the present invention, the above-described fiber sheet may be attached to one surface of the prepreg tape main body, and a film may be attached to the other surface.
Further, the thermal insulation waterproofing method using the prepreg sheet of the present invention is a prepreg sheet or prepreg tape in which a thermal insulation waterproof panel is spread on the construction surface, and a gap between the panels is adhered to a fiber sheet on the prepreg tape main body. Filling and solidification is performed using a prepreg sheet and a liquid resin in which a fiber sheet is attached to one surface of the main body and a release film is attached to the other surface.

According to the present invention, even if the viscosity increase of the resin is lowered, the sheet form can be maintained even when stacked or stored as a roll wound body without sticking to each other, handling and workability It is possible to provide an excellent prepreg sheet.
Moreover, according to the heat insulation waterproofing method of this invention, compared with the conventional heat insulation waterproofing method, a work process and work time can be abbreviate | omitted significantly, the intensity | strength equivalent to the past can be obtained, and also cost reduction can be aimed at.

Embodiments of the present invention will be described with reference to the accompanying drawings.
FIG. 1 is a schematic partial sectional perspective view showing an example of the prepreg sheet of the present invention, and FIG. 2 is a schematic partial sectional perspective view showing another example of the prepreg sheet of the present invention.
FIG. 3 shows an example of the heat insulation waterproofing method of the present invention, (a) is a schematic perspective view showing a part of the rooftop construction part, and (b) shows a part of the rooftop construction surface. It is a typical fragmentary sectional view shown.

The prepreg sheet 1 of the present invention shown in FIG. 1 has a width of the prepreg tape body 2 on the surface of the prepreg tape body 2 impregnated and thickened with a photocurable resin composition containing a photopolymerization initiator in a fiber reinforcement. The prepreg sheet of another embodiment of the present invention shown in FIG. 2 has a fiber sheet 3 attached to one surface of the prepreg tape main body 2. The peelable film 4 is attached to the other surface.
By adhering the fiber sheet 3 to the surface of the prepreg tape body 2, the uncured resin forming the prepreg tape body 2 oozes out to some extent in the fiber sheet 3, but does not reach the surface of the fiber sheet. The surface on the sheet side does not exhibit adhesiveness and handling is improved.

  Therefore, the surfaces of the fiber sheets 3 of the prepreg sheet 1 according to the present invention, or the surfaces of the fiber sheets 3 of the prepreg sheet 1 according to the present invention, and the surface of the film 4 adhered to another prepreg tape body overlap. Even if there is no sticking to each other, even if the prepreg sheets are stacked or stored in a roll-shaped wound body, the form of the sheet can be maintained in a normal form without wrinkles due to the flexibility of the fiber sheet it can.

  Further, when the prepreg sheet of the present invention is adhered to and adhered to an adherend, and further a liquid resin is applied onto the surface of the fiber sheet 3 of the prepreg sheet, the liquid resin soaks into the fiber sheet 3 and from above. When irradiated with ultraviolet rays or the like, the liquid resin soaked in the fiber sheet 3 is cured in the same manner as the photocurable resin composition impregnated and thickened in the fiber reinforcement constituting the prepreg tape body 2, Solidification strength equivalent to that of the prepreg sheet itself can be obtained without using a separate skeleton member such as glass fiber.

The fiber sheet 3 used in the prepreg sheet of the present invention is selected according to the viscosity of the photocurable resin composition impregnated in the prepreg tape body to which the fiber sheet is attached.
Examples of the fiber sheet 3 include synthetic resins such as non-woven fabric, chopped strand mat, cloth, glass fiber, vinylon, and nylon. In particular, a vinylon chopped strand mat having a thickness of 0.2 to 0.4 mm is preferably employed. it can.

Next, the said conventional heat insulation waterproofing method using the prepreg sheet 1 of this invention is shown to Fig.3 (a), (b).
First, the protruding edges 12 of the opposing panels 11, 11 are covered with butyl rubber tape 10 so as to straddle and cover between the protruding edges 12 of the side surfaces of the FRP molded heat-resistant waterproof panel 11 laid on the construction surface and fixed by the anchor 6. , 12 are adhesively fixed.
In addition, when using a long prepreg sheet wound in a roll shape, it is not necessary to connect the prepreg sheets to each other, so that it is not necessary to use an extra liquid resin for achieving watertightness of the connecting portion. Due to this, sticking of butyl rubber tape can be omitted.

  Next, the prepreg sheet 1 of the present invention is adhesively disposed on the butyl rubber tape 10 so that the fiber sheet 3 side is the upper surface, and the liquid resin 5 is further coated on the fiber sheet 3 and applied on the applied liquid resin 5. Then, air bubbles remaining between the fiber sheets 3 are discharged outside by pressing with a roll-shaped brush, and the process is terminated.

  According to the construction method of the present invention, compared to the conventional construction method described in [0007], the steps a) and b) can be omitted, and since it is not necessary to perform two plies, the work process can be greatly shortened. In addition, the application work of the liquid resin to the reinforced fiber laid with skill can be halved, so that the work can be greatly rationalized and the cost can be reduced.

It is also conceivable to apply a prepreg sheet having a film pasted on both sides to the method of the present invention.
In this case, aside from the problem of aesthetics based on wrinkles that occur in the long wound body, unlike the layup type at the construction site, the advantage of eliminating the need for two plays is the same as the present invention, but the film on one side is peeled off. It is essential that the exposed prepreg sheet body is adhered to the protruding edges 12 and 12 of the opposing panel 11, and after the prepreg sheet body is confirmed to be cured and fixed to the panel, the film on the other side is peeled off. Become.

On the other hand, in the prepreg sheet of the present invention, there is no film on the other side that can be peeled off after the applied liquid resin is cured, and it is attached to the prepreg sheet body in advance. Further, it is only necessary to apply the liquid resin to the fiber sheet 3 (reinforcing fiber), and an additional process performed after the liquid resin is cured is not required, so that the required process can be greatly shortened.
In addition, unlike the conventional prepreg sheet, a film that peels off from the prepreg sheet after curing is unnecessary, so that waste generated from the site is reduced, and further, the trouble of turning the film becomes unnecessary. The advantage of is unwavering.

  If the prepreg sheet of the present invention is used, it is excellent in handling that can maintain the form of the sheet even if the viscosity of the resin is lowered, without sticking to each other, and stored as a stacked or roll-shaped wound body Prepreg sheets can be provided, so it can be applied to adherends (reinforcement of structures, various construction sites, etc.) that have been avoided in the past due to cumbersome handling, complicated processes, and high costs. The industrial application field is very wide.

It is a typical fragmentary sectional perspective view which shows an example of the prepreg sheet | seat of this invention. It is a typical fragmentary sectional perspective view which shows the other example of the prepreg sheet | seat of this invention. An example of the heat insulation waterproofing method of this invention is shown, (a) is a typical perspective view which shows a part of construction part, (b) is a typical partial cross section which shows a part of construction surface. FIG. It is a typical fragmentary sectional view of the construction surface in the conventional rooftop heat insulation waterproofing method.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Prepreg sheet 2 Prepreg tape main body 3 Fiber sheet 4 Film 5 Liquid resin 6 Anchor
10 Butyl rubber tape 11 Panel 12 Protruding edge 13 (Panel) Liquid resin 14 Reinforcing fiber

Claims (4)

A photocurable prepreg sheet comprising a fiber sheet adhered to a prepreg tape body. The photocurable prepreg sheet according to claim 1, wherein the fiber sheet is formed wider than the width of the prepreg tape body. The photocurable prepreg sheet according to claim 1 or 2, wherein a fiber sheet is attached to one surface of the prepreg tape body, and a peelable film is attached to the other surface. A heat insulating waterproof panel is laid on the construction surface, and a gap between the panels is filled and solidified using the photocurable prepreg sheet and the liquid resin according to any one of claims 1 to 3. Waterproof construction method.

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