JP3274155B2 - Manufacturing process of sandwich structure panel - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a sandwich structure panel using a honeycomb core as a core material.

[0002]

2. Description of the Related Art In recent years, interior and exterior panels of building materials represented by sandwich-structured panels have been widely used for the purpose of weight reduction and heat insulation.
Aluminum honeycomb, plastic foam, wood, nonwoven fabric molding, glass wool molding, gypsum board, etc. are used,
It is manufactured by bonding various surface materials to both sides. In recent years, honeycomb sandwich structure panels have become the most mainstream, and door panels, indoor and outdoor partitions,
It is widely used as shutters, furniture, blackboards, white boards, office equipment housing panels, etc. These primary honeycomb sandwich structural panels are commonly manufactured in the following manner. For example, in the field of manufacturing sandwich structure panels for insulated shutters, mainly using a room temperature curing type epoxy adhesive, after directly applying to a paper honeycomb core or surface plate,
A processing method of obtaining a panel product by hardening and curing under pressure and further pressurizing for a long time is widely adopted. Also, for example, in a sandwich structure panel in the field of interior door panel manufacturing, a chloroprene adhesive or a thermoplastic hot melt adhesive containing ethylene-vinyl acetate as a base polymer is applied to a honeycomb core material or a surface plate. After that, it is heated and pressed to obtain panel products.

[0003]

However, the manufacturing entity still has many problems. In detail, in a manufacturing method represented by a heat-insulating shutter, for example, a two-component main agent type epoxy adhesive is simultaneously applied to a core material through a roll coater for double-sided coating on the upper and lower surfaces, and then the upper and lower surfaces are bonded together. Or, or overcoat each of the upper and lower surface plates,
Although a method such as bonding the core material after sandwiching is adopted, in this method, contact handling to the receiving jig and the receiving worker is a major problem in handling after the coating is completed. Furthermore, long-term curing and curing are indispensable for adhesive fixation, and the like, which complicates the process and is a bottleneck for improving productivity. In the field of panel manufacturing using solvent-type chloroprene-based adhesives, such as interior sandwich panels, a drying process is indispensable, complicating the process and causing the risk of environmental pollution and fire from solvents. There is.
In the panel manufacturing field using a non-reactive hot melt adhesive as an adhesive in consideration of this problem, there is a limit in heat resistance, and there is a problem mainly limited to indoor use. In recent years, as an adhesive suitable for manufacturing a sandwich structure panel using a multipurpose honeycomb core as a core material, a moisture-curable urethane-based hot-melt adhesive has been proposed in response to the aforementioned problems. The manufacturing method used is also disclosed in Japanese Patent Application Laid-Open No. 2-25843. These methods using moisture-curable hot-melt adhesives have high heat-resistant adhesive strength after curing and can exhibit the same practical strength as using conventional epoxy-based adhesives. It has become possible to adopt it for honeycomb sandwich structure panels. Conventionally, a long-term curing curing step was required for epoxy adhesives. However, the use of the moisture-curable hot melt adhesive has a feature that the curing curing step can be omitted. However, at present, in the method of manufacturing a sandwich structure panel using a reactive moisture-curable urethane-based hot-melt adhesive disclosed so far, it still takes about 30 seconds or more to temporarily fix the adhesive pressure, There are problems such as having two to three days for complete curing. Generally, the moisture-curable reactive hot melt adhesive does not gel in a short time during the coating operation because it is necessary to apply the melt coating through a heat coating machine such as a roll coater coating or a spray coating. The curing accelerator is blended and adjusted within the range, and the moisture curing rate is generally not so fast, and it takes 2 to 3 days at room temperature for complete curing adhesion. Therefore, since the curing is not completed in a short time, there is a problem that partial peeling of the surface agent often occurs due to residual strain of the member after the completion of the temporary bonding step, and a processing method of shortening the temporary bonding step and a short time complete curing is strongly desired. ing. In addition, moisture-curable urethane-based liquid adhesives, which have been widely known, have been used for bonding glass-reinforced polyester resin moldings, fixing tiles, etc. It is considered that the reactive hot-melt adhesive can basically be used as an adhesive for panel manufacture. In the above-described reactive hot-melt adhesive, there is basically a danger of burns, and isocyanate vapor generated by thermal decomposition is sucked. There is an advantage that this adhesive does not have the problems of toxicity and environmental pollution. However, as a major problem, the current processing method is not used much because of the problem that the temporary adhesive property expression time is long and the productivity is extremely inferior, and the management is complicated in the coating process. That is, as the greatest same problem for achieving high productivity using a moisture-curable urethane-based liquid adhesive or a moisture-curable urethane-based hot-melt adhesive, temporary bonding that is compatible with the short-time pressing step The main purpose is to propose a processing method for improving the performance. In addition, the time required for the practical strength of the adhesive is reduced.

[0004]

As a result of intensive studies to solve the above-mentioned problems, the following processing method was found, and the present invention was achieved. That is, the present invention is as follows. (A) When manufacturing a sandwich structure panel in which a honeycomb core is used as a core material and top and bottom surfaces are bonded to each other, a moisture-curable urethane liquid adhesive or a moisture-curable urethane hot melt adhesive is used as an adhesive. In a process prior to press-bonding after application, a isocyanate curing agent and / or an isocyanate-curing accelerator is encapsulated and press-bonded. ). (B) The method for manufacturing a sandwich structure panel according to the above (a), wherein the step of pressing and bonding is performed by ultrasonic heating at the time of pressing and bonding (hereinafter abbreviated as method B). (C) The method for producing a sandwich-structured panel according to the above (a) or (b), wherein the isocyanate curing agent is water vapor or water droplets. (D) The method for producing a sandwich-structured panel according to any of (a) to (c) above, wherein the isocyanate curing agent is an amine gas or an amine droplet. (E) the isocyanate curing accelerator is a tertiary amine vapor or a tertiary amine droplet,
(D) A method of manufacturing and processing any one of the sandwich-structured panels according to (1). (F) The above (a) to (e), wherein an organotin compound is encapsulated and used as an isocyanate curing accelerator.
A method for manufacturing a sandwich-structured panel according to any of the preceding claims. (G) The method for producing a sandwich-structured panel according to the above (f), wherein the organotin compound is dibutyltin dilaurate. (H) The adhesive according to the above (a), wherein the adhesive is a moisture-curable urethane-based hot-melt adhesive of an initial adhesive type.
To (g). (1) The method for producing a sandwich-structured panel according to any of (1) to (6) above, wherein the adhesive is a one-part urethane liquid adhesive. (7) The method for producing a sandwich structure panel for building materials according to any one of the above (1) to (7), wherein the sandwich structure panel is a building material flash panel or a building material door panel.

Hereinafter, the present invention will be described in more detail. The honeycomb core described in the present invention is generally a core material described below. For example, a paper honeycomb core, a phenol-impregnated paper honeycomb core, an aluminum hydroxide-impregnated paper honeycomb core, an aluminum honeycomb core, a plastic honeycomb core, and the like can be given. The use of these honeycomb core materials alone or in combination is not a problem in the present invention, and a composite material of a conventionally known core material other than the core material may be used. Further, the surface plate described in the present invention means upper and lower surface materials of the sandwich structure panel, and there is no particular limitation, but the following members are typical.
For example, a color decorative steel plate, an aluminum plate, a slate plate, a plywood plate, a stainless steel plate, an erio steel plate, and the like are typical, and other special examples include a glass plate, a tile decorative plate, a plastic plate, a cork plate, and a cardboard plate. Can be

The moisture-curable urethane liquid adhesive or moisture-curable urethane hot-melt adhesive described in the present invention may be any known one, and is not particularly limited. Representative. For example, for a diol component such as a polyester-based polyol component or a polyether-based polyol component, a polyetherester polyol component, an acrylic-based polyol component, or a polyolefin-based polyol component, at least two or more active isocyanate groups in the molecule described below. Having a polyisocyanate component in an equivalent ratio of —OH: —NCO of 1:
A one-part urethane liquid adhesive which is a liquid at room temperature and exhibits a moisture-curing property containing a urethane prepolymer containing an active isocyanate group as a main component, which is obtained by reacting at a ratio of 1.2 to 5; Similarly, a semi-solid or solid hot-melt adhesive composition which is viscous at room temperature may be used. The polyisocyanate component having at least two or more active isocyanate groups in the molecule, diphenylmethane diisocyanate, hydrogenated diphenylmethane diisocyanate, tolylene diisocyanate, hydrogenated tolylene diisocyanate, isophorone diisocyanate, hexamethylene diisocyanate, naphthalene diisocyanate,
Representative examples include polymethylene polyphenyl polyisocyanate, xylylene diisocyanate, and dimer or polyhedral compounds thereof. Further, for example, an active isocyanate group containing a copolymer of a vinyl isocyanate monomer having at least one ethylenic double bond in the molecule and another vinyl monomer having a high copolymerizability with the vinyl isocyanate monomer may be left. Urethane liquid adhesive which is liquid at room temperature and exhibits moisture-curing properties mainly composed of urethane prepolymer containing active isocyanate group, and semi-solid or solid hot-melt adhesive composition which is also viscous at room temperature Things are also a typical example.

Hereinafter, the moisture-curable urethane liquid adhesive and the semi-solid or solid moisture-curable urethane hot melt adhesive composition which is viscous at room temperature are collectively referred to as a urethane adhesive. The urethane-based liquid adhesive may be any of the following known as needed, such as rosin or rosin ester derivatives, coumarone resin, indene resin, terpene resin, terpene phenol resin, dicyclopentadiene resin, and hydrogenated resins thereof. A tackifier which is liquid at normal temperature, [phthalic acid ester derivatives such as dioctyl phthalate, liquid polybutene, liquid isoprene, paraffin oil, naphthenic oil, aroma oil,
Softener or plasticizer [such as chlorinated paraffin, epoxy plasticizer, phosphate ester, etc.], isocyanate curing catalyst [such as organic transition metal catalyst represented by dibutyltin dilaurate, etc.], [calcium carbonate, talc, colloidal] Silica, etc.] in which fillers, pigments, antioxidants, ultraviolet stabilizers or ultraviolet absorbers, organic thixotropy-imparting agents, interface modifiers represented by silane compounds, etc. are appropriately contained without any problem. .

[0008] The urethane hot-melt adhesive may, if necessary, be known in the following [for example, an ethylene copolymer represented by polyester, polyurethane, ethylene-vinyl acetate copolymer or ethylene- (meth) acrylate copolymer]. Polymers, styrene-butadiene-styrene block copolymers, styrene-isoprene-styrene block copolymers, styrene-based block copolymers represented by their hydrogenated resins, styrene- (meth) acrylate copolymers, etc. Thermoplastic polymers, such as rosin or rosin ester derivatives, cumarone resins, indene resins, terpene resins, terpene phenol resins, dicyclopentadiene resins, styrene resins, xylene resins, petroleum resins and their hydrogenated resins. A tackifier,
[For example, phthalate derivatives such as dioctyl phthalate, liquid polybutene, liquid isoprene, paraffin oil, naphthenic oil, aroma oil, chlorinated paraffin, epoxy plasticizer, phosphate ester, etc.]
Softeners or plasticizers, waxes [such as paraffin wax, microcrystalline wax, polyethylene wax, polypropylene wax, natural wax, etc.];
Isocyanate curing catalysts [such as organic transition metal catalysts represented by dibutyltin dilaurate, etc.], fillers [such as calcium carbonate, talc, colloidal silica, etc.], pigments, antioxidants, UV stabilizers or UV absorbers, organic This is a case where a thixotropy imparting agent, an interface modifier represented by a silane compound and the like are appropriately contained, and there is no problem at all. Generally, the use of the urethane adhesive having an active isocyanate group content of 12% or less, preferably 5% or less, particularly preferably in the range of 1 to 3% is excellent in stability and workability. It is preferable from the viewpoint of moisture curability.

In the present invention, a method for applying the urethane adhesive to the honeycomb core material or the surface plate may be a known method, and generally, a roll coater application,
A coating method such as spray coating or bead coating may be appropriately adopted. The coating amount is preferably in the range of about 20 to 300 g / m 2 so that the coating can be performed uniformly. In order to prevent the urethane adhesive from skinning and gelling on the roll when applying the roll coater, smooth application is possible by devising to improve the stability of the adhesive through inert gas, dry air, etc. Become. It is customary to use the same handling method for a similar problem in a continuous urethane adhesive supply apparatus.
A hot melt roll coater “product name: TECMIC” for moisture-curable adhesives sold by Matsushita Industry Co., Ltd. is the most typical example of a coating machine. When using a hot melt type urethane adhesive, it is generally necessary to monitor and pay attention to the concentration of isocyanate gas generated by thermal decomposition in the environment. There have been proposed a large number of the above-mentioned adhesives which can sufficiently achieve the above, and among them, it is preferable to select and use a non-polluting adhesive. Generally, if the area around the coating equipment is sufficiently ventilated, it can be handled without any problem. The present invention also applies the urethane adhesive described above when pressing and bonding,
In the pre-process, that is, in advance, an isocyanate curing agent and / or an isocyanate curing accelerator described in detail below is encapsulated in the space between the honeycomb core and the portion sandwiched between the upper and lower surface materials, and thereafter, an adhesive processing method of pressing and bonding. (Method A), and more preferably, the pressure bonding is performed by ultrasonic heating bonding (Method B).
And how to do it.

The isocyanate curing agent can be employed as long as it is a monomer having at least one hydroxy group and / or amino group or imino group in the molecule which undergoes an addition reaction with an active isocyanate group, and is not particularly limited. The following substances are representative: For example, water, ethylamine, propylamine,
Butylamine, hexylamine, cyclohexylamine, aniline, ethylenediamine, ethanolamine,
Diethanolamine, triethanolamine, diethylenetriamine, triethylenetetramine, tetraethylenepentamine, pentaethylenehexamine, ethyleneimine, ethylene glycol, diethylene glycol,
1,4-butanediol, 1,3-butanediol,
1,4-diaminobutane, 1,2-diaminopropane,
1,3-diaminopropane, ammonia and the like are raised,
Preferably water, ethylamine, propylamine, butylamine, hexylamine, cyclohexylamine, aniline, ethylenediamine, ethanolamine, diethanolamine, triethanolamine, diethylenetriamine, triethylenetetramine have a high activity and a low boiling point, and can be easily gasified as required. It is a preferable example because it can be supplied in a mist state. The isocyanate curing agent is preferably handled in the form of gas or droplets (including fog droplets) in terms of operation. In particular, the method of using water vapor as an isocyanate curing agent is most recommended from the viewpoint of non-pollution. In addition, the isocyanate curing accelerator of the present invention can be preferably used as long as the isocyanate group and the isocyanate curing agent exhibit a functional curing that completes the reaction in a short time, and are not particularly limited. Is typical. For example, there are tertiary amines such as trimethylamine, triethylamine and N-methylmorpholine, and transition metal organic catalysts such as cobalt, tin, lead, vanadium, iron, manganese and zinc, and preferably organic tin catalysts represented by dibutyltin dilaurate. Is a highly recommended example because it is effective when using steam as a curing agent. The isocyanate curing accelerator is preferably handled in the form of gas or droplets (including fog droplets). Methods of encapsulating the gap portion between the upper and lower surfaces material sandwiched between portions of the honeycomb core, an isocyanate curing agent and or an isocyanate curing accelerator in the present invention, during the bonding process to its immediately preceding, gaseous or Kirishizuku state How to supply and enclose in the. Alternatively, a method of dropping in a droplet state in the core gap portion of the honeycomb sandwich structure panel adhered on one side and immediately placing one of the surface plates and enclosing the same may be appropriately adopted. Upon encapsulation, the amount of the isocyanate curing agent and / or isocyanate curing accelerator is 0.01 to
100 mg / cm @ 3, particularly preferably 0.1 to 3 mg / cm @ 3.
0 mg / cm3 is good. In the case where water vapor is charged, the amount may vary depending on the environmental humidity. In an environment in a low saturation humidity state such as winter, it is better to increase the amount of added water than in summer to produce good results.

There is no particular limitation on the pressing method of the present invention in which a surface plate is stuck on the upper and lower surfaces of the core material after application, and there is no particular limitation. Generally, a pressing roll, a press or a continuous belt pressing press is used. And may be low-temperature pressing or heating pressing. The method B described in the present invention is a method in which ultrasonic heating is also used in the pressing step. By performing the ultrasonic heating, an effect of instantaneously gasifying the isocyanate curing agent and / or the isocyanate curing accelerator present in a liquid state after encapsulation is exhibited, and as a result, the interaction with the adhesive is significantly improved. It is because a result is obtained. In particular, when the above-mentioned isocyanate curing agent and / or isocyanate curing accelerator is supplied and sealed in the form of mist droplets or droplets, a remarkable action and effect is recognized, and the processing which can be most preferably employed when the urethane adhesive is in an initial liquid state. Is the way. The object of the present invention can be achieved by allowing the temporary bonding to be completely performed within a pressing time of about 5 seconds to 1 minute, but the pressing time is longer than that in order to completely develop the curing of the adhesive. Of course, there is no problem with the method. The method of manufacturing and processing the honeycomb sandwich structure panel of the present invention can be preferably employed in the same manufacturing fields such as various kinds of building materials having a honeycomb core as a core material, for electric materials, for decoration, for furniture, for automobiles, and particularly for interior materials for building materials. It is preferable as a method for producing a flash panel represented by an outward door panel, a partition and a shutter.

[0012]

EXAMPLES Examples of the present invention will be shown below, but the present invention is not limited thereto, and parts described in the examples are parts by weight.
Before describing the examples, the urethane adhesive compositions described in the examples were prepared by an adhesive prepared in the following manner or a commercially available adhesive. Adjustment of moisture-curable urethane-based hot-melt adhesive (called adhesive A). Mitsui Toatsu Chemicals crude MDI as diphenylmethane diisocyanate and polybutadiene polyol as polyol, Nippon Soda's product PBG
-2000 was mixed at an equivalent ratio of isocyanate group to hydroxy group of 2 and reacted in a nitrogen stream at 100 ° C. for 5 hours to obtain a urethane prepolymer. For 100 parts of the urethane prepolymer, 15 parts of an ethylene-vinyl acetate copolymer (Evaflex 220, manufactured by DuPont-Mitsui Polychemicals) as a thermoplastic polymer, and Superester A-100 (a rosin ester derivative, Arakawa Chemical Co., Ltd.) 20 parts, 0.002 parts of dibutyltin dilaurate as an internal curing accelerating catalyst are uniformly melt-kneaded at 120 ° C. in a nitrogen stream, and a urethane adhesive exhibiting a semi-solid initial tack at room temperature is obtained. Obtained. Moisture-curable urethane liquid adhesive (referred to as adhesive B) "Stract Bond UR-101", a product of Mitsui Toatsu Chemicals, obtained from the market, was prepared. The composition is an adhesive comprising a filler such as talc containing a polyester-modified urethane prepolymer. Adjustment of moisture-curable urethane-based hot melt adhesive (called adhesive C). Crude MDI, a product of Mitsui Toatsu Chemicals, as diphenylmethane diisocyanate, Kuraray P-2010, a product of Kuraray Co., Ltd., a polyester polyol as a polyol, dimethyl terephthalic acid and 1,
Average molecular weight 1500 derived from 4-butanediol
The polyol component mixed at a 7: 3 weight ratio of the polyester diol was mixed at an equivalent ratio of isocyanate group to hydroxy group of 2 and reacted in a nitrogen stream at 100 ° C. for 5 hours to obtain a urethane prepolymer. To 100 parts of the urethane prepolymer, 15 parts of a styrene-isoprene-styrene block copolymer (15% by weight as isoprene) as a thermoplastic polymer and 0.002 parts of dibutyltin dilaurate as an internal curing accelerating catalyst at 120 ° C. The mixture was uniformly melt-kneaded in a nitrogen stream to obtain a urethane adhesive solid at room temperature.

Embodiment 1 FIG. Paper honeycomb (thickness: 25) stored at 20 ° C./75% humidity as a core material
mm, width 800 mm, length 1700 mm) and two surface plates (the same size as the core material) are prepared in advance, and the adhesive is coated on the upper surface of the core material with a hot melt roll coater at 110 ° C. and 60 g / m ² on one side. It applied so that it might become. After the application, the core material was placed on the joining surface of one surface plate, passed slightly through a pressing roll, and after reversing, the same adhesive was again applied to the other core material surface. After the application is completed, the other surface plate is set to a step of bonding, and the steam obtained by the ultrasonic heating generator is applied to the gap of the honeycomb core at 10 mg / cm.
^The surface plate was immediately lowered by spraying ^three averages, and water vapor was sealed inside the core. Immediately after the encapsulation, a pressure of 0.5 kg / cm ² was applied by a hot press adjusted to 60 ° C. for 25 seconds, and as a result, there was no need for a cooling press, and both surface plates showed sufficient temporary adhesion. No end blisters were observed. The obtained panel was subjected to an end-face dressing treatment, left at room temperature for 2 days, and then taken out as a product. When the adhesiveness of the core was determined by a peeling check, the material breaking strength of the core was shown. Embodiment 2. FIG. In Example 1, after sealing the water vapor, in the press-bonding using the ultrasonic heating of 10,000 Hz in the pressing step, the same result was obtained even if the pressing time was reduced by half. Embodiment 3 FIG. In Example 1, the same result was obtained by enclosing the same amount of mist of ethylenediamine instead of water vapor.

Embodiment 4 FIG. In Example 1, a 2 m spray of an aqueous solution containing 50 PPM of dibutyltin dilaurate was used.
After the g / cm < ³ > sealing, the press-bonding time using the ultrasonic heating of 10,000 Hz in the pressing step was able to reduce the pressing time by about 5 to 8 seconds by half. Embodiment 5 FIG. As a result of performing the same processing method as in Example 1 except that the adhesive B was used as the urethane adhesive, the heating and pressing time was 2 minutes at 80 ° C., and then the same time was applied to the cooling press for temporary bonding. Sex was possible. 1 in heating press process
The combined use of the 10,000 Hz ultrasonic heating could further reduce the heating and cooling pressing time by about 30 seconds each. Embodiment 6 FIG. In Example 1, the same size of phenolic resin-impregnated paper honeycomb as the core material was used, and the amount of application to the surface plate was 40 g per side instead of the core material using an adhesive agent as the adhesive.
As a result of performing the same procedure except that the pressure was set to / cm ² , the temporary adhesive strength was exhibited by performing the heating and pressing at 70 ° C. for 30 seconds, and the puncture rate was almost 0. On the other hand, when an ultrasonic wave of 10,000 Hz is used in combination for heating and pressing, the temperature can be further lowered and the temperature is improved by approximately 10 ° C.

Comparative Example 1 In Example 1, in the manufacture of the same panel in which water vapor was not added and sealed with respect to the same member that was left in a state where the working atmosphere was at a temperature of 10 ° C. and a humidity of 50%,
It was observed that the operation time of the pressing step required 1 minute or more, and puncturing often occurred unless the pressing and fixing was performed by a cooling press. With respect to the same member whose working atmosphere was left at 30 ° C./85% humidity, the probability of occurrence of puncture was reduced to 10% or less. Comparative Example 2. The result obtained in Example 5 without adding and encapsulating steam was that the temporary adhesiveness was insufficient and was not practical.

[0016]

The effect of Comparative Example 1 is the result of using a moisture-curable urethane-based hot-melt adhesive having an initial tackiness property. The results show that the adhesiveness is greatly affected, and the results show that pressing for more than 1 minute is not yet sufficient.
On the other hand, as is clear from Examples 1 to 4 and 6, in the example of the present invention, it was possible to manufacture by pressing in a short time. It was also found that the time required for the final practical strength to be significantly improved. Comparative Example 2 and Example 5 show the results of a comparative study of the results of a general-purpose moisture-curable urethane liquid adhesive used in tile applications conventionally known. It has been clarified that the method of (1) is improved and can be sufficiently put into practical use. It is convinced that the present invention is highly practical especially in the winter, when the working environment humidity or the preservation environment humidity of the sandwich panel member to be bonded is low, even when it is viewed as a construction method that exhibits the same high productivity as in summer.

────────────────────────────────────────────────── ─── Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI C09J 175/04 C09J 175/04 // B29L 31:60 B29L 31:60 (56) References JP-A-5-124164 (JP, A) JP-A-2-258243 (JP, A) JP-A-61-127341 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B29C 65/00-65/82 B32B 3 / 00-3/30 B32B 31/00-31/30 C09J 175/00-175/16

Claims (10)

(57) [Claims] 1. A moisture-curable urethane-based liquid adhesive or a moisture-curable urethane-based hot-melt adhesive is used as an adhesive in the production of a sandwich structure panel in which a honeycomb core is used as a core material and surface plates are adhered to upper and lower surfaces thereof. in agent step before press bonding after coating using a Hanikamuko isocyanate curing agent and / or isocyanate curing accelerator
A method for manufacturing a sandwich-structured panel, characterized by sealing in a portion sandwiched between a gap portion and upper and lower surface materials and press-fitting. 2. The method of manufacturing a sandwich structure panel according to claim 1, wherein the step of press-bonding includes ultrasonically heating at the time of press-bonding. 3. The method according to claim 1, wherein the isocyanate curing agent is water vapor or water droplets. 4. The method according to claim 1, wherein the isocyanate curing agent is an amine gas or an amine droplet. 5. The method according to claim 1, wherein the isocyanate curing accelerator is a tertiary amine vapor or a tertiary amine droplet. 6. An organic tin compound is encapsulated and used as an isocyanate curing accelerator.
A method for manufacturing a sandwich-structured panel according to any of the preceding claims. 7. The method according to claim 6, wherein the organotin compound is dibutyltin dilaurate. 8. The method for producing a sandwich-structured panel according to claim 1, wherein the adhesive is a moisture-curable urethane-based hot-melt adhesive of an initial tackiness type. 9. The method according to claim 1, wherein the adhesive is a one-part urethane liquid adhesive. 10. The method according to claim 1, wherein the sandwich structure panel is a building material flash panel or a building material door panel.