JPH05124112A - Method of manufacture and working sandwich structural panel - Google Patents

Abstract

PURPOSE:To shorten a compression process following to the tack adhesion by sealing an isocyanate curing agent and/or an isocyanate cure-accelerating agent in a pre-process wherein clamping adhesion is conducted after the application in use of, as an adhesive, a moisture-curing type urethane liquid adhesive or a moisture-curing type urethane hot melt adhesive. CONSTITUTION:A method of applying an urethane adhesive on a honeycomb core agent or a surface plate appropriately employs an application method of a roll coater application, spray application, bead application or the like. The quantity of application is controlled to be uniformly applied in the range of about 20-300g/m<2>. In the case of applying and compression-bonding an urethane adhesive, at the pre-process, namely, before the fact thereof, an isocyanate curing agent and/or isocyanate cure-accelerator are sealed in the part defined between the spaces of the honeycomb core and the upper and lower surface agents, following this, clamping adhesion is effected. More preferably, such clamping adhesion is carried out by supersonic heating adhesion. As a consequence, an instantaneous gasfication effect is performed, with the result that the mutual operation with the adhesive is improved extraordinarily.

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 having a honeycomb core as a core material.

[0002]

2. Description of the Related Art Building material interior / exterior panels represented by sandwich structure panels have been widely used in recent years for the purpose of weight reduction and heat insulation.
Aluminum honeycomb, plastic foam, wood, non-woven fabric molding, glass wool molding, gypsum board, etc. are used.
It is manufactured by bonding various surface materials on both sides. In recent years, mainly honeycomb sandwich structure panels have become the mainstream, and door panels, indoor and outdoor partitions,
It is widely used as shutters, furniture, blackboards, white boards, and panels for office equipment housings. These major honeycomb sandwich construction panels are commonly manufactured in the following manner. For example, in the field of sandwich structure panel manufacturing in adiabatic shutters, mainly using a room temperature curing type epoxy adhesive, after directly applying to the paper honeycomb core or the surface plate,
A processing method is widely adopted in which a panel product is obtained by pressing and curing and curing for a long time. In addition, for example, in a sandwich structure panel in the field of manufacturing interior door panels, for example, a chloroprene-based adhesive or a thermoplastic hot melt adhesive containing ethylene-vinyl acetate as a base polymer is used to coat a honeycomb core material or a surface plate. Then, it is heated and pressed to obtain a panel product.

[0003]

However, its manufacturing entity still has a number of problems. Specifically, in a manufacturing method represented by adiabatic shutters, for example, a two-component main agent type epoxy adhesive is applied simultaneously to the top and bottom surfaces of a core material via a double-sided coating roll coater, and then the surface materials are attached to each other. Or, top coat each on the upper and lower surface plates,
Although a method of adhering the core material after sandwiching is adopted, in this method, when handling after coating, contact contamination of the receiving jig or the receiving operator is a major problem. In addition, since long-term curing and curing is essential for adhesion and fixation, the process is complicated and becomes a bottleneck for improving productivity. Also, in fields such as panel manufacturing using solvent-type chloroprene-based adhesives typified by interior sandwich structure panels, a drying process is indispensable, and the process is complicated, and there is a risk of environmental pollution and fire caused by solvents. There is.
In the panel manufacturing field in which a non-reactive hot melt adhesive is used as an adhesive in consideration of this problem, there is a limit in heat resistance and there is a problem that it is mainly limited to indoor applications. In recent years, with respect to the above-mentioned problems, a moisture-curable urethane hot melt adhesive has been proposed as an adhesive suitable for manufacturing a sandwich structure panel having a multi-purpose honeycomb core as a core material. The manufacturing and processing method used is also disclosed in "JP-A-2-25843". In the method using these moisture-curable hot melt adhesives, the heat-resistant adhesive strength after curing is high, and it has become possible to develop practical strength similar to that using conventional epoxy adhesives. It has become possible to apply it to the honeycomb sandwich structure panel. Further, conventionally, the epoxy adhesive requires a long-term curing and curing step, but the use of the moisture-curable hot melt adhesive has a feature that the curing and curing step can be omitted. However, in the present situation, in the method for manufacturing a sandwich structure panel using the reactive moisture-curable urethane hot melt adhesive disclosed so far, it takes about 30 seconds or more to temporarily fix the adhesive pressure, There are problems such as having 2-3 days for complete curing. Generally, moisture-curable reactive hot melt adhesives need to be melt-coated through a heat coater such as roll coater coating or spray coating, so they do not gel in a short time during coating work. The curing accelerator is compounded and adjusted in the range, the moisture curing rate is generally not very fast, and it is a substance that the complete curing adhesion requires 2-3 days at room temperature. Therefore, since it does not completely cure 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 temporary bonding process is completed.Therefore, a method of shortening the temporary bonding process or a processing method of short-time complete curing is strongly desired. ing. In addition, the widely known moisture-curable urethane-based liquid adhesives have been used for bonding glass-reinforced polyester resin moldings, fixing tiles, etc. as an adhesive exhibiting excellent adhesive strength. It is considered that it can be used substantially as an adhesive for panel manufacturing, and in the reactive hot melt adhesive, basically, there is a problem that the danger of burns is inherent, and the isocyanate vapor that causes thermal decomposition is sucked in. There are advantages that this adhesive does not have the problems of toxicity and environmental pollution. However, as a main problem, the present processing method is not used so much due to the problem that the temporary adhesive property development time is long and the productivity is extremely poor, and the management complexity in the coating process is a problem. In other words, temporary adhesion that is compatible with the short-time clamping process is the most important issue for achieving high productivity using a moisture-curable urethane liquid adhesive or a moisture-curable urethane hot melt adhesive. The main purpose is to propose a processing method for improving the property. At the same time, the practical strength of the adhesive can be shortened.

[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. (B) When manufacturing a sandwich structure panel in which a honeycomb core is used as a core material and surface plates are bonded to the top and bottom of the core material, a moisture-curable urethane liquid adhesive or a moisture-curable urethane hot melt adhesive is used as an adhesive. A method for manufacturing and processing a sandwich structure panel characterized by encapsulating an isocyanate curing agent and / or an isocyanate curing accelerator in the step before pressure-bonding after application and pressure-bonding (hereinafter referred to as method A). Abbreviated). (B) The method for manufacturing and processing a sandwich structure panel according to the above (a), characterized in that the step of pressure-bonding is ultrasonic heating during pressure-bonding (hereinafter abbreviated as method B). (C) The method for producing and processing a sandwich structure panel according to the above (A) or (B), wherein the isocyanate curing agent is water vapor or water droplets. (D) The method for manufacturing a sandwich structure panel according to any one 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, and the above (A) to
(D) A method for manufacturing and processing a sandwich structure panel according to any one of the above. (F) The above (a) to (e), characterized in that an organotin compound is used as an isocyanate curing accelerator.
A method for manufacturing and processing a sandwich structure panel according to any one of the above. (G) The method for producing and processing a sandwich structure panel according to the above (f), wherein the organotin compound is dibutyltin dilaurate. (H) The above-mentioned (A), wherein the adhesive is an initial adhesive type moisture-curable urethane hot melt adhesive.
A method for manufacturing and processing a sandwich structure panel according to any one of to (g). (I) The method for producing and processing a sandwich structure panel according to any one of (a) to (g) above, wherein the adhesive is a one-liquid type urethane liquid adhesive. (V) The method for manufacturing and processing a sandwich structure panel for a building material according to any one of (a) to (b) above, wherein the sandwich structure panel is a flash panel for building materials or a door panel for building materials.

The present invention will be described in more detail below. The honeycomb core described in the present invention is generally the core material described below. Examples thereof include a paper honeycomb core, a phenol-impregnated paper honeycomb core, an aluminum hydroxide-impregnated paper honeycomb core, an aluminum honeycomb core, and a plastic honeycomb core. The use of these honeycomb core materials alone or in combination does not cause any problems in the present invention, and conventionally known core materials may be used in combination in addition to the core materials. Further, the surface plate described in the present invention means the upper and lower surface materials of the sandwich structure panel, and there are no particular restrictions, but the following members are typical.
Typical examples are color decorative steel plates, aluminum plates, slate plates, veneer plates, stainless steel plates, and erio steel plates.Other special examples include glass plates, tile decorative plates, plastic plates, cork boards, and cardboard boards. Be done.

The moisture-curable urethane liquid adhesive or moisture-curable urethane hot melt adhesive according to the present invention may be any known one, and there is no particular limitation, but It is typical. For example, mainly diol components such as polyester-based polyol component, polyether-based polyol component, polyether ester polyol component, acrylic-based polyol component, and polyolefin-based polyol component, and at least two or more active isocyanate groups described below are contained in the molecule. Having a polyisocyanate component of 1: OH at an equivalent ratio of —OH: —NCO.
A one-pack type urethane liquid adhesive which is liquid at room temperature and which has a moisture-curable property and has a urethane prepolymer containing an active isocyanate group as a main component, which is obtained by reacting in a ratio of 1.2 to 5 Similarly, a semi-solid or solid hot-melt adhesive composition that is viscous at room temperature can be mentioned. The polyisocyanate component having at least two active isocyanate groups in the molecule is diphenylmethane diisocyanate, hydrogenated diphenylmethane diisocyanate, tolylene diisocyanate, hydrogenated tolylene diisocyanate, isophorone diisocyanate, hexamethylene diisocyanate, naphthalene diisocyanate,
Typical examples are polymethylene polyphenyl polyisocyanate, xylylene diisocyanate and their dimeric or polyhedral compounds. Further, for example, obtained by leaving an active isocyanate group containing a copolymer of a vinyl isocyanate monomer having at least one ethylene double bond in the molecule and another vinyl monomer having high copolymerizability with them. A urethane-based liquid adhesive that is liquid at room temperature and has a semi-solid or solid hot-melt adhesive composition that is liquid at room temperature and that has a moisture-curing property based on a urethane prepolymer containing an active isocyanate group The thing is also mentioned as a typical example.

Hereinafter, the moisture-curable urethane liquid adhesive and the semi-solid or solid moisture-curable urethane hot-melt adhesive composition that are viscous at room temperature are collectively referred to as a urethane adhesive. For urethane liquid adhesives, if necessary, the following are already known [for example, rosin or rosin ester derivative, coumarone resin, indene resin, terpene resin, terpene phenol resin, dicyclopentadiene resin, and hydrogenated resins thereof. A tackifier which is liquid at room temperature, [for example, a phthalate derivative such as dioctyl phthalate, liquid polybutene, liquid isoprene, paraffin oil, naphthene oil, aroma oil,
Chlorinated paraffins, epoxy-based plasticizers, phosphoric acid esters, etc.] Softeners or plasticizers, [Transitional metal catalysts represented by dibutyltin dilaurate, etc.] Isocyanate curing catalysts, [Calcium carbonate, talc, colloidal] There is no problem even if a filler such as silica, a pigment, an antioxidant, an ultraviolet stabilizer or an ultraviolet absorber, an organic thixotropic agent, an interface modifier represented by a silane compound, etc. is appropriately contained. ..

The urethane hot melt adhesive may be used in the following, if necessary, as follows: [eg, polyester, polyurethane, ethylene-vinyl acetate copolymers and ethylene- (meth) acrylic acid ester copolymers). Polymers, styrene-butadiene-styrene block copolymers, styrene-isoprene-styrene block copolymers, styrene block copolymers represented by hydrogenated resins thereof, styrene- (meth) acrylic acid ester copolymers, etc. Of thermoplastic polymers, such as rosin or rosin ester derivatives, coumarone resins, indene resins, terpene resins, terpene phenol resins, dicyclopentadiene resins, styrene resins, xylene resins, petroleum resins and hydrogenated resins thereof. ] Tackifier,
[For example, phthalate derivative such as dioctyl phthalate, liquid polybutene, liquid isoprene, paraffin oil, naphthene oil, aroma oil, chlorinated paraffin, epoxy plasticizer, phosphate ester, etc.]
Softeners or plasticizers, [paraffin wax, microcrystalline wax, polyethylene wax, polypropylene wax, natural wax, etc.] wax,
Isocyanate curing catalysts (such as organic transition metal catalysts represented by dibutyltin dilaurate), fillers (such as calcium carbonate, talc, colloidal silica), pigments, antioxidants, UV stabilizers or UV absorbers, organic There is no problem in the case where a thixotropy imparting agent, an interface modifier represented by a silane compound, and the like are appropriately contained. Generally, as the urethane adhesive, it is excellent in stability and workability to use the adhesive having an active isocyanate group content of 12% or less, preferably 5% or less, particularly preferably 1 to 3%. It is preferable from the viewpoint of moisture curability.

In the present invention, the urethane adhesive may be applied to the honeycomb core core material or the surface plate by using a known method, generally, roll coater application,
A coating method such as spray coating or bead coating may be appropriately adopted. It is preferable that the coating amount be approximately 20 to 300 g / m ² so that the coating can be performed uniformly. When applying a roll coater, the urethane adhesive prevents skin sticking and gelation on the roll, so if you try to improve the stability of the adhesive with an inert gas or dry air, smooth application will be possible. Become. It is customary to use the same handling method for similar problems in a continuous supply device of urethane adhesive.
The hot melt roll coater "product name: TECMIC" for exclusive use of the moisture curable adhesive, which is sold by Matsushita Industry Co., Ltd., is an example of the most representative coating machine. When using a hot melt type urethane adhesive, it is generally necessary to sufficiently monitor and pay attention to the concentration of the isocyanate gas in the environment where thermal decomposition occurs, and if the coating temperature is 100 to 120 ° C, it is usually less than the environmental safety standard concentration. A number of the above-mentioned adhesives that can sufficiently achieve the above have been proposed so far, and it is preferable to select and use an adhesive that is highly pollution-free. Generally, if the area around the coating equipment is well ventilated, it can be handled without problems. The present invention also applies the above-mentioned urethane adhesive and press-bonds it,
In the previous step, that is, in advance, in advance, an isocyanate curing agent and / or an isocyanate curing accelerator described in detail below is enclosed in the space between the honeycomb core void and the upper and lower surface agents, and then pressure bonding is performed. (Method A), and more preferably, pressure bonding is ultrasonic heating bonding (Method B).
Method.

The above isocyanate curing agent can be adopted 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 the active isocyanate group, and there is no particular limitation. The following substances are typical. 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, etc. are raised,
Preferably, water, ethylamine, propylamine, butylamine, hexylamine, cyclohexylamine, aniline, ethylenediamine, ethanolamine, diethanolamine, triethanolamine, diethylenetriamine, triethylenetetramine are highly active and have a low boiling point, and can be easily gasted as necessary. Alternatively, it is a preferable example because it can be supplied in a mist state. In terms of operation, it is generally preferable to handle the isocyanate curing agent in the form of gas or droplets (including fog droplets). In particular, the method of utilizing water vapor as an isocyanate curing agent is most recommended in terms of no pollution. Further, the isocyanate curing accelerator of the present invention can be preferably used as long as it is a substance that exhibits action curing to complete the reaction of the isocyanate group and the isocyanate curing agent in a short time, but is not particularly limited, Is typical. For example, there are tertiary amines such as trimethylamine, triethylamine, N-methylmorpholine, and transition metal organic catalysts such as cobalt, tin, lead, vanadium, iron, manganese, and zinc, and preferably an organotin catalyst represented by dibutyltin dilaurate. Is a highly recommended example because it is effective when steam is used as the curing agent. The isocyanate curing accelerator is preferably handled in the form of gas or liquid droplets (including fog droplets). The method of encapsulating the void between the honeycomb core and the upper and lower surface agents in the present invention, the isocyanate curing agent and or isocyanate curing accelerator in the present invention, during or just before the bonding step, in a gaseous or fogged state The method of supplying and encapsulating. Alternatively, it is possible to appropriately adopt a method of dropping in a droplet state into the core void portion of the honeycomb sandwich structure panel adhered on one side and immediately placing one of the surface plates and enclosing it. Upon encapsulation, the amount of the isocyanate curing agent and / or the isocyanate curing accelerator is 0.01-
100 mg / cm ³ range, particularly preferably 0.1-3
0 mg / cm ³ is good. When the water vapor is sealed, it may vary depending on the environmental humidity, and in an environment of low saturation humidity such as in the winter, increasing the amount of the added encapsulation than in the summer produces good results.

There is no particular limitation on the pressing method of the present invention in which the surface plates are adhered to the upper and lower sides of the core material after coating, and there is no particular limitation. Generally, a pressing roll, a press or other continuous belt pressing press is used. Method may be adopted, and low temperature pressing or heating pressing may be used. In addition, the method B according to the present invention is a method of performing ultrasonic heating together in the pressing step. By performing ultrasonic heating, the effect of instantly gasifying the isocyanate curing agent and / or the isocyanate curing accelerator existing in a liquid state after encapsulation is exhibited, and as a result, the interaction with the adhesive is significantly improved. This is because the result can be obtained. In particular, when the above-mentioned isocyanate curing agent and / or isocyanate curing accelerator is supplied and enclosed in the form of mist droplets or droplets, a remarkable effect is observed, and the most preferable process can be adopted 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 adhesion to be completed within about 5 seconds to 1 minute. However, for the purpose of completely developing the curing of the adhesive, the pressing operation is continued for a longer time. Of course, there is no problem with the method. The manufacturing method of the honeycomb sandwich structure panel of the present invention can be preferably adopted in the same manufacturing fields such as various building materials having a honeycomb core as a core material, electric materials, decoration, furniture, automobiles, etc. It is preferable as a method for producing a flash panel typified by an exterior door panel, a partition, and a shutter.

[0012]

EXAMPLES Examples of the present invention will be shown below, but the present invention is not particularly limited thereto, and the parts described in the examples mean parts by weight.
Examples Before describing the urethane adhesive composition described in the examples, an adhesive prepared by the following method or a commercially available adhesive was prepared. Adjustment of moisture-curable urethane hot melt adhesive (called adhesive a). Mitsui Toatsu Chemicals crude MDI as diphenylmethane diisocyanate and polybutadiene polyol as polyol, Nippon Soda Co. product PBG
-2000 was mixed at an equivalent ratio of isocyanate groups and hydroxy groups of 2 and reacted at 100 ° C. for 5 hours in a nitrogen stream to obtain a urethane prepolymer. To 100 parts of the urethane prepolymer, 15 parts of an ethylene-vinyl acetate copolymer (Evaflex 220, a product of Mitsui DuPont Polychemical Co., Ltd.) as a thermoplastic polymer, and Super Ester A-100 (a rosin ester derivative, as a tackifier) (Arakawa Chemical Co., Ltd. product) 20 parts, 0.002 parts of dibutyltin dilaurate as an internal curing accelerating catalyst is uniformly melt-kneaded in a nitrogen stream at 120 ° C. to obtain a urethane adhesive showing a semisolid initial tack at room temperature. Obtained. Moisture curable urethane liquid adhesive (referred to as adhesive B) "Structbond UR-101", a product of Mitsui Toatsu Chemical Co., Inc., obtained on the market was prepared. The composition is an adhesive composed of a filler such as talc containing a polyester modified urethane prepolymer. Adjustment of moisture-curable urethane hot melt adhesive (called adhesive C). Crude MDI, which is a Mitsui Toatsu Chemicals product, as diphenylmethane diisocyanate, and Kuraray P-2010, a product of Kuraray Co., which is a polyester polyol, and dimethyl terephthalic acid, which are polyester polyols as polyols.
1,500 average molecular weight derived from 4-butanediol
The polyol component mixed in a 7: 3 weight ratio of the polyester diol was mixed at an equivalent ratio of isocyanate groups and hydroxy groups of 2 and reacted at 100 ° C. for 5 hours in a nitrogen stream 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 part of dibutyltin dilaurate as an internal curing accelerating catalyst at 120 ° C. The mixture was uniformly melted and kneaded in a nitrogen stream to obtain a urethane adhesive that was solid at room temperature.

Embodiment 1. As a core material, a paper honeycomb (thickness 25
mm, width 800 mm, length 1700 mm) and two face plates (same size as the core material) are prepared in advance, and adhesive a is applied to the upper surface of the core material at 110 ° C. on a hot melt roll coater at 60 g / m ² on one side. It was applied so that After the application, the core material was placed on the joint surface of one surface plate, passed through a light pressure roll, and after reversing, the adhesive material a was applied again to the surface of the other core material in the same manner. After finishing the coating, set the other surface plate to the step of laminating, and then add 10 mg / cm of steam obtained by the ultrasonic heating generator to the gap between the honeycomb cores.
³ encapsulating steam is lowered immediately faceplate blowing the average inner core. Immediately after the encapsulation, a pressure of 0.5 Kg / cm ² was applied with a heat press adjusted to 60 ° C. and pressed for 25 seconds. As a result, there was no need for a cooling press and both surface plates showed sufficient temporary adhesion. No blister on the end face was observed. The panel thus obtained was subjected to end face dressing, left at room temperature for 2 days, and then taken out as a product. When the adhesion of the core material was judged by a peelability check, the material showed a breaking strength. Example 2. In Example 1, the same result was obtained even if the pressing time was halved in the press bonding using the ultrasonic heating of 10,000 Hertz in the pressing step after filling the water vapor. Example 3. In Example 1, the same result was obtained by enclosing the same amount of mist of ethylenediamine instead of water vapor.

Example 4. In Example 1, 2 m of fog droplets of an aqueous solution containing 50 PPM of dibutyltin dilaurate were used.
After encapsulating g / cm ³ , press bonding using ultrasonic heating of 10,000 hertz in the pressing step could halve the pressing time by about 5 to 8 seconds. Example 5. 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 80 ° C. for 2 minutes, and the same time was followed by the cooling press for temporary adhesion. Was possible. 1 in hot press process
It was possible to further shorten the heating and cooling pressing time by about 30 seconds by using ultrasonic heating of 10,000 hertz together. Example 6. In Example 1, a phenol resin-impregnated paper honeycomb of the same size was used as the core material, and an adhesive C was used as the adhesive agent.
/ Cm ² and with the exception results were carried out in the same manner, the temporary adhesion strength at a heating pressing temperature be performed for 30 seconds at 70 ° C. is expressed, puncture rate was almost zero. On the other hand, when the ultrasonic pressure of 10,000 hertz was used together during the heating and pressing, the temperature could be further lowered and the temperature was improved by about 10 ° C.

Comparative Example 1. In Example 1, in the production of the panel in which the working atmosphere was left under the condition of the temperature of 10 ° C. and the humidity of 50%, the water vapor was not added and sealed in the panel.
It was observed that work time of the pressing process required 1 minute or more, and punctures were often made unless the product was pressed and cooled and fixed by a cooling press. The puncture occurrence rate was less than 10% for the same member left in the working atmosphere of 30 ° C./85% humidity. Comparative example 2. The results obtained in Example 5 without adding and enclosing water vapor showed that the temporary adhesiveness was insufficient and was not practical.

[0016]

EFFECTS OF THE INVENTION From Comparative Example 1, the results were obtained using a moisture-curable urethane hot melt adhesive having an initial tackiness property. The results show that the adhesiveness is greatly influenced, and the result is that pressing for 1 minute or more is not sufficient yet.
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 for a short time. It was also found that the development time of the final practical strength is significantly improved. Comparative Example 2 and Example 5 are the results of comparative examination of the results of the conventionally known general-purpose moisture-curing urethane liquid adhesives used for tile applications, but apparently the temporary adhesiveness is the present invention. It was revealed that the method of (1) improved and that it could be sufficiently put into practical use. It is convinced that the present invention is highly practicable especially when viewed as a construction method exhibiting the same high productivity as in summer even in the winter when the humidity of the working environment or the humidity of the preservation environment of the sandwich panel member used for bonding is low.

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁵ Identification number Internal reference number FI Technical display location C09J 175/04 JEZ 8620-4J // B29L 31:60 4F (72) Inventor Kosuke Suekaka Kanagawa 1190 Kasama-cho, Sakae-ku, Yokohama Mitsui Toatsu Chemical Co., Ltd.

Claims (10)

[Claims] 1. A moisture-curable urethane liquid adhesive or moisture-curable urethane 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 the upper and lower surfaces of the honeycomb core. A method for producing and processing a sandwich structure panel, comprising encapsulating an isocyanate curing agent and / or an isocyanate curing accelerator in a step before pressure-bonding after application using a chemical agent and pressure-bonding. 2. The method of manufacturing a sandwich structure panel according to claim 1, wherein the step of press-bonding comprises ultrasonically heating at the time of press-bonding. 3. The method for producing and processing a sandwich structure panel according to claim 1, wherein the isocyanate curing agent is steam or water droplets. 4. The method for producing and processing a sandwich structure panel according to claim 1, wherein the isocyanate curing agent is amine gas or amine droplets. 5. The method for manufacturing and processing a sandwich structure panel according to claim 1, wherein the isocyanate curing accelerator is a tertiary amine vapor or a tertiary amine droplet. 6. An organotin compound is encapsulated and used as an isocyanate curing accelerator.
A method for manufacturing and processing a sandwich structure panel according to any one of the above. 7. The method for manufacturing a sandwich structure panel according to claim 6, wherein the organotin compound is dibutyltin dilaurate. 8. The method of manufacturing and processing a sandwich structure panel according to claim 1, wherein the adhesive is an initial tacky moisture-curable urethane hot melt adhesive. 9. The method for manufacturing and processing a sandwich structure panel according to claim 1, wherein the adhesive is a one-liquid type urethane liquid adhesive. 10. The method for producing and processing a sandwich structure panel for building materials according to claim 1, wherein the sandwich structure panel is a flash panel for building materials or a door panel for building materials.