JPH09272577A - Moisture-curing hot melt adhesive, container for filling the same and using method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a filling container for moisture-curing hot melt adhesive which is light-weighted and easy to handle wherein permeability is so low that an adhesive may not be hardened in the container and the container is available at a low cost, the moisture-curing hot melt adhesive to be filled in the filling container and a method for using the moisture-curing hot melt adhesive wherein disposal of the container after use can be easily done. SOLUTION: A container body 1 and a bottom plate 10 are made of a cardboard (as thick as 2mm), and a laminate sheet 2 is laminated on an inner face of the container body 1 and the bottom plate 10. The laminate sheet 2 is a laminate comprising an aluminum foil 21 having a thickness of 50μm and a polyethylene film 22 having a thickness of 20μm. The aluminum foil 21 is stuck to the cardboard of the container body 1 and the bottom plate 10, and the polyethylene film 22 is facing the inside of the container. A surface of the polyethylene film 22 of the laminate sheet 2 is subjected to mold-releasing treatment by silicone coating.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a moisture-curable hot melt adhesive, its filling container, and a method of using the moisture-curable hot melt adhesive.

[0002]

2. Description of the Related Art Moisture-curable hot-melt adhesives react with moisture in the air or moisture in an adherend and crosslink to exert a very strong adhesive force. In addition, 100
Although it is extracted in a molten state at around ℃ and filled in a highly airtight container, a container that does not have moisture permeability is selected because it is a moisture curing type. Furthermore, the space after being filled with the adhesive is also filled with an inert gas such as nitrogen or carbon dioxide in place of air.

In the case of a container having a large opening area and low airtightness, a moisture-curing type in which a composite film made of a resin film, a metal foil or the like having no moisture permeability or a very low moisture permeability is filled in the container. A method of laying on the surface of an adhesive is disclosed in JP-A-3-
It is described in Japanese Patent No. 162269. Usually, a metal container is used as a container body having no moisture permeability. In the case of a metal container having a wide opening, the effect can be obtained by covering the surface of the adhesive filled with the moisture impermeable film as described in the above publication. However, the metal container is heavy, difficult to handle, and expensive. Therefore, there is a demand for a container that is lightweight and has no moisture permeability or has a very low moisture permeability.

When a moisture-curable hot melt adhesive is used, it is usually set in a specific applicator together with the container to heat the adhesive, and the melted adhesive is supplied to a coating machine by a gear pump or the like for use. . Therefore, the container body is also required to have heat resistance. In this way, since it is sent to the coating machine in a molten state in the container, a considerable amount of adhesive remains in the container after the adhesive is used, and it is necessary to treat this container by a specialist. There was a flaw.

The present invention solves the above-mentioned problems of the prior art, is light and easy to handle, has a very low moisture permeability, does not cure in a container, and is filled with a moisture-curable hot-melt adhesive which can be obtained at low cost. It is an object of the present invention to provide a container, a moisture-curable hot melt adhesive with which the filling container is filled, and a method of using the moisture-curable hot melt adhesive that allows easy disposal of the container after use.

[0006]

According to a first aspect of the present invention, there is provided a moisture-curable hot melt adhesive filling container, wherein a metal sheet, a resin-laminated metal sheet, and a release treatment are applied to the inner surface of a cylindrical container made of paper. A sheet selected from a metal sheet and a release-treated synthetic resin sheet is laminated.

The moisture-curable hot melt adhesive according to a second aspect is characterized by being filled in the filling container according to the first aspect.

A method of using the moisture-curable hot melt adhesive according to claim 3 is to remove the moisture-curable hot melt adhesive filled in the filling container according to claim 1 from the container in a solid state, It is characterized by heating and melting this at 80 to 150 ° C. and supplying it to a coating machine.

The moisture-curable hot-melt adhesive filling container according to claim 1 is made of paper, and the plane shape thereof is not particularly limited, such as circular or square, but has high strength and is easy to manufacture. In terms of points, a cylindrical shape is preferable. The capacity is generally 100 cc to 200 liters.

On the inner surface of the container body, a metal sheet, a resin-laminated metal sheet, a release-treated metal sheet,
Any of the synthetic resin sheets subjected to the release treatment is laminated. As the metal sheet, for example, aluminum, gold,
Examples thereof include a sheet or foil of silver, copper, zinc, stainless steel or the like, or a tin plate or the like.

The metal sheet may be laminated on the inner surface of the container by an adhesive alone, but may be a laminated sheet with the synthetic resin sheet, and the synthetic resin sheet side may be adhered to the inner surface of the container by heat bonding or an adhesive. Good.

The softening temperature of the synthetic resin sheet is 80.
It is preferably at least ℃, for example, polyethylene,
Examples thereof include polypropylene, polyethylene terephthalate, polyvinylidene chloride, and other engineering plastics. These may be a single substance or a laminated body in which two or more kinds are laminated.

It is preferable that the surface of the above-mentioned metal sheet or synthetic resin sheet which is in contact with the moisture-curable hot melt adhesive filled in the container is subjected to a mold release treatment. Examples of the releasing treatment method include, but are not particularly limited to, silicone resin coating and fluorine-based resin coating, as long as the releasing action is not lost in the range of 80 ° C to 150 ° C.

The moisture-curable hot melt adhesive used in the present invention is obtained by reacting an organic polyol compound with an organic polyisocyanate compound or a silane coupling agent, and has an isocyanate group or a hydrolyzable silyl group at the terminal. It contains a urethane prepolymer having a thiol group and can be handled as a solid at room temperature.

The above-mentioned polyol is a conventionally known one which is usually used in the production of polyurethane.
Examples of such polyols include polyester polyols, polyether polyols, polyalkylene polyols, polycarbonates and the like.

Specific examples of the above polyester polyols include terephthalic acid, isophthalic acid, 1,5-naphthalic acid, 2,6-naphthalic acid, succinic acid, glutaric acid, adipic acid, pimelic acid, suberic acid and azelaine. A polycarboxylic acid such as an acid, a sebacic acid, a decamethylenedicarboxylic acid or a dicarboxylic acid such as dodecamethylenedicarboxylic acid,
For example, ethylene glycol, propylene glycol,
1,3-propanediol, 1,4-butanediol,
Neopentyl glycol, 1,5-pentanediol,
Examples thereof include polyester polyols obtained by reaction with polyols such as diethylene glycol and cyclohexanediol, and other than that, poly-ε-caprolactone polyols obtained by ring-opening polymerization of ε-caprolactam.

Examples of the polyether polyol include polyethylene glycol, polypropylene glycol, polytetramethylene glycol and the like. Examples of the polyalkylene polyol include polybutadiene polyol, hydrogenated polybutadiene polyol, hydrogenated polyisoprene polyol and the like. Examples of the polycarbonate polyol include polyhexamethylene carbonate polyol and polycyclohexane dimethylene carbonate polyol. These polyols may be used alone or in combination of two or more.

Examples of the polyisocyanate include tolylene diisocyanate, liquid modified products of diphenylmethane diisocyanate, hexamethylene diisocyanate, xylylene diisocyanate, cyclohexanephenylene diisocyanate, naphthalene-1,5-diisocyanate and the like. Among these polyisocyanates, diphenylmethane diisocyanate and its modified products are preferable from the viewpoints of vapor pressure, toxicity and easy handling.

As the silane coupling agent, for example,
γ-aminopropylmethyldiethoxysilane, γ-aminopropyltrimethoxysilane, γ-aminopropyltriethoxysilane, N-aminoethylaminopropyltriethoxysilane, β- (3,4-epoxycyclohexyl) ethyltrimethoxysilane, γ-glycidyloxypropyltrimethoxysilane, mercaptoethyltriethoxysilane, γ-mercaptopropyltrimethoxysilane and the like can be mentioned.

The tackifying resin used in the present invention cooperates with other adhesive components to give the moisture-curable hot melt adhesive excellent initial adhesiveness. Examples of such tackifying resins include rosin-based resins, terpene-based resins,
Aliphatic petroleum resins or aromatic petroleum resins are mentioned. Preferably, those having a ring and ball softening point of 90 to 150 ° C. are used. These tackifier resins may be used singly depending on the compatibility with other adhesive components and the kind of adherend, or may be used as a mixture of two or more kinds.

(Operation) Since the main body of the filling container of the present invention is made of paper, it is lightweight and easy to handle. Further, since it has heat resistance, it can be filled with a molten hot melt adhesive. Since the inner surface of the container is laminated with any one of a metal sheet, a resin-laminated metal sheet, a release-treated metal sheet, and a synthetic resin sheet, water vapor is not transmitted and storage stability is excellent. When the inner surface in contact with the adhesive is subjected to a mold release treatment, it is particularly easy to take out the adhesive as it is in a solid state, and it is possible to easily dispose of the container after use.

Since the moisture-curable hot melt adhesive according to claim 2 is filled in the filling container according to claim 1, it can be taken out as a solid at room temperature, and as in the case of a metal container. It can be melted by heating and taken out, and it is very easy and easy to handle.

A method for using the moisture-curable hot melt adhesive according to claim 3 is to take out the adhesive as a solid from the filling container according to claim 1 and heat and melt the adhesive at 80 to 150 ° C. Since it is supplied to the applicator, it is very easy to handle, and the time for melting is also shortened because it is directly heated by the applicator without being heated from outside the filling container.
Further, since the hot melt adhesive is taken out from the container in a solid state, it is possible to take out the molten adhesive without leaving any molten adhesive inside the container. This allows the used container to be easily processed.

[0024]

Embodiments of the present invention will be described below. Synthesis of Adhesive Moisture-curing Moisture-curing Hot-melt Adhesive 200 parts by weight of polyester polyol (Mw = 3000, hydroxyl value 30) obtained by reacting adipic acid with 1,6-hexanediol is melt-mixed at 100 ° C. After that, 34 g of diphenylmethane diisocyanate was added thereto and reacted for 3 hours under a nitrogen atmosphere to prepare a moisture-curable hot melt adhesive.

Moisture-curing Moisture-curing Hot Melt Adhesive A polyester polyol (Huls) which is an amorphous solid at room temperature.
Company name, product name "Dynacol 7110", hydroxyl value 5
6) 500 g and crystalline polyester polyol (manufactured by Nippon Polyurethane Industry Co., Ltd., trade name "Nipporan 4010",
After melt-mixing with 100 g of hydroxyl value 52) at 100 ° C. for 1 hour and dehydration under reduced pressure, 150 g of diphenylmethane diisocyanate (NCO / OH = 2.0) was added and reacted for 2 hours under nitrogen atmosphere, and then γ-mercaptopropyl 120 g of trimethoxysilane was added and heated and mixed at 100 ° C. for 2 hours to obtain a moisture-curable moisture-curable hot melt adhesive having a silyl group at the end.

(Embodiment 1) FIG. 1 is a sectional view showing a part of a container for filling the moisture-curable hot melt adhesive of the present invention.
The container body 1 and the bottom plate 10 are made of thick paper (thickness 2 mm),
The lower portion 11 of the container body 1 is folded back inward and meshed with and joined to the end of the bottom plate 10. Container body 1 and bottom plate 10
The laminated sheet 2 is laminated on the inner surface of the. The laminated sheet 2 is a laminated body of an aluminum foil 21 having a thickness of 50 μm and a polyethylene film 22 having a thickness of 20 μm. The aluminum foil 21 is adhered to the container body 1 and the cardboard of the bottom plate 10, and the polyethylene film 22 faces the inside of the container. The surface of the polyethylene film 22 of the laminated sheet 2 is subjected to a release treatment by silicone coating. The container body 1 has an inner diameter of 135 mm and a capacity of 1 kg. 100 ℃ melted
The container was filled with 1 kg of the adhesive, and immediately after nitrogen purging, the polyethylene film of the membrane sheet 3 (having the same structure as the laminated sheet 2) was placed on the lower side to cover the opening in the upper portion of the container and laminated at 200 ° C. The sheet 2 was heat-sealed with the polyethylene film 22 and further covered with a polypropylene lid 4 (thickness: 3 mm) and allowed to cool.

Example 2 A container similar to that of Example 1 was filled, except that an adhesive was used instead of the adhesive.

(Embodiment 3) FIG. 2 is a partial cross-sectional view showing another embodiment of the moisture-curable hot melt adhesive filling container of the present invention. The container body 6 and the bottom plate 60 are thick paper (thickness 5 mm)
The aluminum foil 5 having a thickness of 100 μm is adhered to the inner surface thereof with an adhesive. The surface of the aluminum foil is subjected to a mold release treatment with a silicone coating. The inside diameter of this container is 135 mm and the capacity is 2 kg. To the above filling container, 2 pieces of the melted adhesive at 120 ° C.
Immediately insert a concave aluminum seal film 30 (thickness: 0.5 mm) that is filled with kg and has a rising portion 31 at the periphery and is capable of closely contacting the inner peripheral surface of the container body 6, and the seal film 30 comes into contact with the adhesive. Push it all the way to the top, then polypropylene lid 4 (thickness 3 mm)
Covered and allowed to cool.

Example 4 Filling was performed in the same manner as in Example 3 except that an adhesive was used instead of the adhesive.

Comparative Example 1 A tin can (manufactured by Mikuni Metal Co., Ltd., with a 40φ cap) having a capacity of 2 kg was filled with a molten 100 ° C. adhesive, immediately purged with nitrogen, and a polyethylene cap with an inner lid was used. It was sealed.

(Comparative Example 2) Filling was performed in the same manner as in Comparative Example 1 except that an adhesive was used instead of the adhesive.

The containers of Examples and Comparative Examples filled with the adhesive as described above were placed in an atmosphere of 30 ° C. and 80% RH for 3 hours.
After leaving for a month, when each adhesive is taken out as a solid, or when it is re-melted at 100 ° C. and taken out as a liquid, it is put into an applicator set at 120 ° C. to form a cured film on the surface. The presence or absence of gelation was observed.
Table 1 shows the results.

[0033]

[Table 1]

As shown in Table 1, the samples of Examples 1 to 4 could be easily taken out in the solid state or in the molten state. However, those of Comparative Examples 1 and 2 could not be taken out as solid unless the side surface of the container was cut off with pliers.

[0035]

EFFECTS OF THE INVENTION The moisture-curable hot melt adhesive filling container according to claim 1 is lightweight and easy to handle, and has heat resistance, so that a molten hot melt adhesive can be filled therein. In addition, since the water vapor does not permeate, the filled adhesive has excellent storage stability. Further, when the inner surface in contact with the adhesive is subjected to the mold release treatment, it is particularly easy to take out the adhesive as it is in a solid state, so that the disposal of the container after use can be facilitated.

The moisture-curable hot-melt adhesive according to claim 2 can be taken out in a solid state at room temperature, so that it is very easy and easy to handle. Further, the adhesive can be used entirely without leaving an adhesive in the container.

According to the method of using the moisture-curable hot-melt adhesive of claim 3, the adhesive is taken out from the container in a solid state, melted and supplied to the applicator, so that the handling operation is very simple. Therefore, the time for melting is also shortened. Further, since the hot melt adhesive is taken out from the container in a solid state, no molten adhesive remains in the container,
You can use everything without waste. This allows the used container to be easily processed.

[0038]

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of a moisture-curable hot melt adhesive filling container of the present invention.

FIG. 2 is a cross-sectional view showing another embodiment of the moisture-curable hot melt adhesive filling container of the present invention.

[Explanation of reference symbols] 1,6: container body 2: laminated sheet 3: membrane sheet 4: lid 5,21: aluminum foil 10,60: bottom plate 22: polyethylene film 30: seal film 31: rising part

Claims (3)

[Claims] 1. A sheet selected from a metal sheet, a resin-laminated metal sheet, a release-treated metal sheet, and a release-treated synthetic resin sheet is laminated on the inner surface of a cylindrical container made of paper. A container for filling a moisture-curable hot-melt adhesive, which is characterized in that 2. A moisture-curable hot melt adhesive, which is filled in the filling container according to claim 1. 3. The moisture-curable hot melt adhesive filled in the filling container according to claim 1 is taken out from the container in a solid state, heated and melted at 80 to 150 ° C. and supplied to a coating machine. A method for using a moisture-curable hot melt adhesive characterized by: