JP2013067946A - Manufacturing method of gypsum board composite - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manufacturing method of a gypsum board composite, which allows cross sections of gypsum boards or a gypsum board and another material abutted each other to be compounded in a short time.SOLUTION: A manufacturing method of a gypsum board composite includes abutting a cross section 11 of a gypsum board 1 and an adherend 2 to be bonded, so that a face panel 4 is bonded to the surfaces of the gypsum board 1 and the adherend 2. The gypsum board 1 and the adherend 2 are arranged side by side such that an adhesive 3 for bonding thereof is supplied across both of the surface edges.

Description

  The present invention relates to a method for producing a gypsum board composite material.

  2. Description of the Related Art Conventionally, composite boards using a gypsum board as a part of a material have been used as boards used for the inner wall surface, ceiling surface, flooring, furniture, and the like of a building. Gypsum board is particularly suitable as a material for composite boards used in buildings because it is inexpensive and has fire resistance.

  Conventionally, as such a composite board, a composite board has been proposed in which a gypsum board and an object to be bonded are attached to each other at the cut surface of the gypsum board and bonded to each other, and a decorative material is bonded to the surface (for example, cited reference 1 reference).

  Normally, the surface of the plaster board is covered with paper, but the plaster is exposed on the cut surface. And the cut surface of the gypsum board from which this gypsum is exposed has gypsum intervening in the cut surface as fine powder.

  Therefore, when the cut surface of the gypsum board and the object to be bonded are bonded together, the adhesive surface is covered with the fine powder of gypsum, and there is a problem that sufficient strength cannot be bonded.

  In order to solve such problems, a method has been proposed in which a cut surface of a gypsum board and an object to be bonded are attached and bonded using a vinyl acetate adhesive or the like (see, for example, Patent Document 2).

Japanese Utility Model Publication No. 7-43199 JP-A-8-13739

  According to this method, the vinyl acetate adhesive or the like enters from the gypsum board cutting surface to the inside, so that relatively high strength bonding is possible. However, even with this method, there are problems that it is difficult to specify the coating amount of the adhesive and that it takes time to develop the adhesive strength.

  It should be noted that such gypsum board cutting surface is not only bonded with the gypsum board cutting surface and the adherend made of a material other than gypsum board, but also gypsum. The same problem occurs when the cut surface of the board and the gypsum board as the adherend are bonded together.

  The present invention has been made in view of the circumstances as described above, and includes a cut surface of a gypsum board and another material as an adherend, or a cut surface of a gypsum board and a gypsum board as an adherend. It is an object of the present invention to provide a method for producing a gypsum board composite material that can be composited in a short time in a state in which it has remained.

The present invention is characterized by the following in order to solve the above problems.
That is, the method for producing a gypsum board composite material of the present invention includes a gypsum board composite material in which a cut surface of a gypsum board and an object to be bonded are attached and bonded, and the surface material is bonded to the surface of the gypsum board and the surface of the object to be bonded. In this manufacturing method, the gypsum board and the object to be bonded are arranged side by side, and an adhesive is supplied so as to straddle both surface ends.

  In this method for producing a gypsum board composite material, it is preferable that the adhesive supplied so as to straddle the surface ends of both the gypsum board and the adherend is a reactive adhesive.

  Moreover, in the manufacturing method of the said gypsum board composite material, it is preferable that a reactive adhesive is a hot-melt-adhesive.

  Moreover, in the manufacturing method of the said gypsum board composite material, it is preferable to supply an adhesive by scanning a surface edge part helically.

  Furthermore, in the manufacturing method of the said gypsum board composite material, it is preferable to adhere | attach a surface material on the surface of both a gypsum board and a to-be-adhered object with a hot-melt-adhesive.

  According to the present invention, in a state where the cut surface of the gypsum board and another material as the adherend or the cut surface of the gypsum board and the gypsum board as the adherend are attached together, they are bonded and combined in a short time. be able to.

It is a schematic perspective view for demonstrating the state which supplies and adhere | attaches an adhesive so that the gypsum board of this invention and the surface edge part of a to-be-adhered object may be straddled. (A) is a schematic plan view which shows the state which supplies an adhesive agent in a linear strip | belt shape, (B) is a schematic plane which shows the state which supplies an adhesive agent so that a surface edge part may be scanned helically. FIG. It is a schematic perspective view for demonstrating the state which affixes a surface material, after adhere | attaching a gypsum board and a to-be-adhered object. (A) is a front view which shows the state before sticking a surface material, (B) is a front view which shows the state which affixed the surface material, without reactivating the reactivation adhesive agent, (C ) Is a front view showing a state where a reactive adhesive is reactivated and a surface material is attached.

  Below, this invention is demonstrated based on embodiment.

  The method for producing a gypsum board composite material according to the present invention, as shown in FIG. 1, arranges a gypsum board 1 and an object to be bonded 2 and supplies an adhesive 3 so as to straddle both surface edges to bond them. The contact surface when the gypsum board 1 and the adherend 2 are combined is different from the surface where the adhesive is supplied.

  Usually, the adhesive is supplied to the contact surfaces of the objects to be bonded. However, at least one of the objects to be bonded is a gypsum board and the cut surface where the gypsum is exposed is covered with the gypsum fine powder. Therefore, the adhesive strength is extremely reduced.

  On the other hand, paper is usually attached to the surface of the gypsum board, and this paper has a very good adhesive force with the adhesive. Therefore, as shown in FIG. By supplying the adhesive 3 so as to straddle the part, it is possible to perform the composite without being affected by the cut surface 11 of the gypsum board 1.

  In the method for producing a gypsum board composite material of the present invention, there is no particular limitation on the adherend 2 to be bonded to the cut surface 11 of the gypsum board 1, for example, inorganic material, resin material, solid wood material, plywood , Laminated wood, medium density fiberboard (hereinafter simply referred to as MDF), particle board, gypsum board and the like.

  As plywood, ordinary plywood with laminated laminar, veneer, etc., coniferous plywood with laminated softwood, thin veneer, hippo, maple, walnut, beach, etc., paper A plywood or the like having a film or the like bonded to the surface can be used.

  Moreover, in the manufacturing method of the gypsum board composite material of this invention, as the adhesive agent 3 supplied so that the surface edge part of the gypsum board 1 and the to-be-adhered object 2 may be straddled, the paper of the gypsum board 1 surface, and the to-be-adhered object 2 The adhesive 3 can be used without particular limitation as long as it has an adhesive force with both surfaces and forms a solidified layer of adhesive with a certain thickness, and examples thereof include synthetic rubber, olefin resin, and the like. An adhesive made of

  Among these, a reactive adhesive that can be reactivated is preferable. For example, a hot melt adhesive whose main component is an ethylene vinyl acetate resin, a synthetic rubber, an olefin resin, or the like can be suitably used.

  Bonding the gypsum board 1 and the adherend 2 so as to straddle the surface ends of the gypsum board 1 using a hot-melt adhesive makes the gypsum board 1 and the adherend 2 strong without adhering at the cut surface 11 of the gypsum board 1 Can be connected.

  The reactive adhesive used in the present invention means an adhesive that can be solidified once supplied and then reactivated with a solvent, heat, or the like when necessary.

  The supply method of the adhesive 3 for bonding across the gypsum board 1 and the surface end of the adherend 2 is not particularly limited as long as it is supplied across the surface end of both members. However, for example, a method of supplying a linear belt as shown in 31 of FIG. 2A or a method of supplying a surface end portion in a spiral shape as shown in 32 of FIG. 2B Is mentioned.

  According to the supply method that scans the surface end portion in a spiral shape indicated by 32 in FIG. 2 (B), the adhesive 3 is supplied so as to be rubbed in the same supply range. This is particularly preferable since the adhesive strength can be effectively obtained with a small supply amount of the adhesive 3.

  Next, in the method for producing a gypsum board composite material of the present invention, as shown in FIG. 3, the gypsum board 1 and the adherend 2 are bonded, and then the surface material 4 is bonded to the surfaces of both members.

  The surface material 4 used in the present invention can be appropriately selected depending on the use application of the gypsum board composite material.

  Examples of these surface materials 4 include synthetic resin sheets (films) on which various patterns have been applied, projecting plates formed by slicing natural precious wood, plywood, laminated materials, MDF, particle boards, and the like. Among these, MDF can be suitably used from the viewpoint of the strength of the gypsum board composite material.

  As shown in FIG. 4A, as the adhesive 41 for bonding the surface material 4 to the surfaces of the gypsum board 1 and the adherend 2, the gypsum board 1 and the adherend 2 are firmly attached to the surface material 4. Any adhesive can be used without particular limitation, and examples thereof include a hot melt adhesive and a vinyl acetate adhesive.

  In the present invention, when MDF is used as the surface material 4, it is preferable to use a hot-melt adhesive among the above-described adhesives 41, and in particular, a PUR (Poly Urethane Reactive) type adhesive can be suitably used.

  PUR adhesive is a reactive hot-melt resin that has a polyurethane-based uncured resin (prepolymer) as a main component and has the property of reacting with water, for example, moisture in MDF, and curing after heating and dissolution. is there.

  In addition, when large thickness comes out to the adhesion part by the adhesive agent 3 which adhere | attaches the gypsum board 1 and the surface edge part of the to-be-adhered object 2, if the surface material 4 is affixed on this as it is, FIG. The non-adhesion part 30 by the level | step difference of the hot-melt-adhesive 3 as shown to (B) may arise.

  In consideration of such a case, the hot melt adhesive 3 is softened as shown in FIG. 4C by performing reactivation such as heating using the hot melt adhesive of the reactive adhesive. Thus, the level difference is reduced and the occurrence of the non-bonded portion 30 as shown in FIG. 4B can be eliminated.

  EXAMPLES Hereinafter, the present invention will be described in more detail with reference to examples. However, the present invention is not limited to these examples.

<Example 1>
A gypsum board and plywood as an object to be bonded, both having a length of 500 mm, a width of 50 mm, and a thickness of 9.5 mm are prepared, and the cut surface of the gypsum board and the end face of the plywood are attached to each other, as shown in FIG. As described above, a hot melt adhesive (PUR: manufactured by DIC Corporation, MK200Y) was applied in a linear strip shape so as to straddle the gypsum board and the surface end of the adherend.

  The hot melt adhesive had a width of 5 mm so as to straddle the gypsum board and the surface edge of the adherend, and was applied under the conditions shown in Table 1 to produce a composite material of gypsum board and plywood.

<Example 2>
A composite material of gypsum board and plywood was produced in the same manner as in Example 1 except that the hot melt adhesive was applied with a spiral width of 10 mm as shown in FIG. The adhesive application conditions were as shown in Table 1.

<Comparative Example 1>
Prepare gypsum board and plywood, both 500 mm long, 50 mm wide, and 9.5 mm thick, and apply a vinyl acetate adhesive to the gypsum board cutting surface and the end face of the plywood to produce a composite material of gypsum board and plywood. did. The adhesive application conditions were as shown in Table 1.

<Comparative example 2>
A composite material of gypsum board and plywood was produced in the same manner as in Comparative Example 1 except that a hot melt adhesive (PUR: manufactured by DIC Corporation, MK200Y) was used as the adhesive. The adhesive application conditions were as shown in Table 1.

  The composites of the gypsum board and plywood of Examples 1 and 2 and Comparative Examples 1 and 2 were evaluated for workability, adhesive strength, and comprehensive evaluation.

[Workability]
The workability of joining the gypsum board and plywood was evaluated according to the following criteria.
A: Workability is very good.
○: Workability is good.
Δ: Workability is poor.
X: Workability is very poor.

[Adhesive strength]
The adhesion strength at the joint between the gypsum board and the plywood was measured by pulling in the direction orthogonal to the end face where the gypsum board and the plywood were attached, according to the peel strength test of JIS A5905 (fiberboard).

[Comprehensive evaluation]
The overall evaluation was evaluated based on the following criteria from workability and adhesive strength.
A: Very good overall workability and adhesive strength.
○: Workability and adhesive strength may be combined.
Δ: Either workability or adhesive strength is poor.
X: The workability and adhesive strength are very poor overall.

  The evaluation results are shown in Table 1.

  From these results, Comparative Example 1 in which the cut surface of the gypsum board was bonded with a vinyl acetate adhesive had good adhesive strength, but the gypsum board was bonded so as to straddle the surface edge of the adherend. Compared with Examples 1 and 2, the curing time of the adhesive was long and the amount of adhesive applied was also large.

  In addition, as a method for bonding the gypsum board and the surface end of the object to be bonded, Example 2 in which the adhesive is applied in a spiral shape has a higher adhesive strength than that in Example 1 in which the adhesive is applied in a linear strip shape. Although it is inferior, it is excellent in terms of curing time, adhesive application amount and workability, and it has been confirmed that it is sufficient when considered to be temporary adhesion up to adhesion of the surface material.

  Furthermore, it was confirmed that Examples 1 and 2 have better workability than Comparative Examples 1 and 2. As a comprehensive evaluation, it was confirmed that Examples 1 and 2 were superior to Comparative Examples 1 and 2.

  Next, composite materials of gypsum board, plywood and surface material shown in Examples 3 and 4 and Comparative Example 3 were produced.

<Example 3>
On the surface of the composite material of gypsum board and plywood produced in Example 2, MDF (manufactured by N & E Co., Ltd.) having a length of 500 mm, a width of 100 mm, and a thickness of 2.7 mm was used as a surface material. The composite material of the gypsum board, the plywood, and the surface material was produced by bonding using MK200Y). The temperature during application of the adhesive was 130 ° C.

<Example 4>
A composite material of gypsum board, plywood and surface material was produced in the same manner as in Example 3 except that the temperature during application of the adhesive was 90 ° C.

<Comparative Example 3>
A composite material of gypsum board, plywood and surface material was produced in the same manner as in Example 3 except that an aqueous vinyl urethane adhesive (NS-5, manufactured by Oshika Co., Ltd.) was used as the adhesive.

  Regarding the composite materials of the gypsum board, the plywood and the surface material of Examples 3 and 4 and Comparative Example 3, the adhesion strength, the adhesion evaluation between the surface material adhesive and the hot melt adhesive, and the overall evaluation were performed.

[Adhesiveness between surface material adhesive and hot melt adhesive]
The adhesion between the surface material adhesive and the hot melt adhesive was evaluated according to the following criteria.
(Double-circle): The adhesiveness is very good.
○: Adhesiveness is good. (Not applicable)
X: Adhesiveness is bad.

[Adhesive strength]
The adhesive strength at the joint between the gypsum board and the plywood was measured according to the peel strength test of JIS A5905 (fiberboard).

[Comprehensive evaluation]
The overall evaluation was evaluated according to the following criteria from the adhesive strength and the adhesive strength between the adhesive of the surface material and the hot melt adhesive.
(Double-circle): The adhesive strength and the adhesiveness between the adhesive of the surface material and the hot melt adhesive are very good.
○: The adhesive strength and the adhesiveness between the surface material adhesive and the hot melt adhesive may be combined.
X: Either the adhesive strength or the adhesiveness between the adhesive of the surface material and the hot melt adhesive is bad.

  The evaluation results are shown in Table 2.

  From these results, the PUR adhesive heated at a temperature at which the reactivation of the hot melt adhesive was developed after the gypsum board and the surface edge of the object to be bonded were bonded using the hot melt adhesive. In Examples 3 and 4 in which the MDF of the surface material was bonded, the adhesive strength and the adhesive of the surface material and the hot melt adhesive were compared with those of Comparative Example 3 in which the reactivation of the hot melt adhesive was not performed. It was confirmed that the adhesiveness was excellent.

DESCRIPTION OF SYMBOLS 1 Gypsum board 11 Cut surface 2 To-be-adhered object 3 Adhesive 30 Non-adhesion part 31 Supply of linear strip-shaped adhesive 32 Spiral adhesive supply 4 Surface material 41 Adhesive

Claims (5)

  A method for producing a gypsum board composite material in which a cut surface of a gypsum board and an object to be bonded are bonded together and a surface material is bonded to the surface of the gypsum board and the surface of the object to be bonded. A method for producing a gypsum board composite material, characterized in that an adhesive is supplied and bonded so as to straddle both surface edges.   2. The method for producing a gypsum board composite material according to claim 1, wherein the adhesive supplied so as to straddle the surface ends of both the gypsum board and the adherend is a reactive adhesive.   The method for producing a gypsum board composite according to claim 2, wherein the reactive adhesive is a hot melt adhesive.   The method for producing a gypsum board composite material according to any one of claims 1 to 3, wherein the adhesive is supplied by scanning a surface end in a spiral manner.   The method for producing a gypsum board composite material according to any one of claims 1 to 4, wherein a surface material is bonded to both surfaces of the gypsum board and an adherend with a hot melt adhesive.

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