JP2002188071A - Glutinous moisture-setting hot melt adhesive and coating application method using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a glutinous moisture-setting hot melt adhesive that shows the stickiness enough to perform temporal tack even immediately after the adhesive is coated and applied, allows the curing reactions to progress with the passage of time and can attain excellent bond strength sufficient for use in the building materials and provide an excellent coating application method by using this adhesive. SOLUTION: The objective glutinous moisture-setting hot melt adhesive mainly comprises a synthetic rubber pressure-sensitive adhesive and a polyurethane bearing terminal isocyanate groups wherein the synthetic rubber pressure- sensitive adhesive and the polyurethane are mutually compatible or microdispersible and the mass ratio is 9/1 to 1/9. A thermally insulating material or an acoustic insulating material with 5 kg/m2 mass/unit area is partially coated with the hot-melt adhesive in an amount of 10-100 g/m2 at a plurality of places, then the insulating material is applied to wall or ceiling faces.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot-melt adhesive having both tackiness and moisture-curability, and a method for applying and using the same.

[0002]

2. Description of the Related Art Moisture-curable hot-melt adhesives do not use an organic solvent, so they can prevent contamination of the working environment, and are excellent in heat resistance as automotive-related materials, building materials, woodwork furniture, etc. Is widely used in the field of
An easy-to-use reactive hot melt adhesive is disclosed in
No. 253785. The hot-melt adhesive described in this publication imparts stability during storage and application by blocking an isocyanate compound involved in a curing reaction with a compound having an active hydrogen group. There is a disadvantage that reheating at a high temperature is required to develop.

[0003] Usually, a moisture-curable hot melt adhesive is
Immediately after coating and pasting, there is almost no adhesive strength, so temporarily fix with an anchor pin, temporary fixing adhesive, double-sided adhesive tape, etc. until the adhesive strength of the adhesive develops, or avoid this In order to develop the adhesive force in a relatively short time, re-heating at a high temperature as described in the above-mentioned gazette, or a drawback that requires complicated handling such as requiring some special contrivance is there.

[0004]

SUMMARY OF THE INVENTION In view of the above-mentioned problems, the present invention exhibits sufficient tackiness to provide a temporary fixing function immediately after coating and pasting, and the curing reaction proceeds with time, so that it can be used for building materials. The present invention provides a moisture-curable hot-melt adhesive capable of obtaining sufficient adhesive strength that can be used sufficiently, and furthermore, by using this solvent-free adhesive, it is possible to prevent the working environment from being contaminated and to use a single-use adhesive. It is an object of the present invention to provide a method of applying a heat-insulating material and a sound-insulating material in a short time by applying a heat-insulating material and a sound-insulating material.

[0005]

SUMMARY OF THE INVENTION The present invention achieves the above object, and comprises a synthetic rubber-based pressure-sensitive adhesive and a polyvalent isocyanate compound having a polyol having an isocyanate group in excess of the hydroxyl group contained in the polyol. And the synthetic rubber-based pressure-sensitive adhesive and the polyurethane are compatible or micro-dispersed, and have a mass ratio of 9 /
An adhesive moisture-curable hot melt adhesive characterized in that the adhesive has a weight of 1 to 1/9, and a mass per unit area of 5
1 kg / m ² or less of the above-mentioned adhesive moisture-curable hot melt adhesive is partially applied to a plurality of portions of a heat insulating material or a soundproofing material.
A paste application method characterized in that the paste is applied at a usage amount of 0 to 100 g / m ^{2 and} is applied to a wall surface or a ceiling surface in a building room.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail.
In preparing the synthetic rubber adhesive used for the adhesive moisture-curable hot melt adhesive of the present invention, isoprene rubber, styrene isoprene rubber, styrene butadiene rubber, styrene isoprene styrene rubber, styrene butadiene styrene rubber, or the like One or more synthetic rubbers such as rubbers obtained by hydrogenating rubbers are used.

In preparing the above synthetic rubber-based pressure-sensitive adhesive, terpene resin, terpene phenol resin, xylene resin, rosin, rosin ester, hydrogenated rosin, hydrogenated rosin ester, cumarone indene resin, petroleum resin, hydrogenated petroleum A tackifier such as a resin is used alone or in combination of two or more.

Further, the synthetic rubber-based pressure-sensitive adhesives described above include polyolefin resins such as polyethylene, polypropylene or the like, which are compatible with the synthetic rubber or micro-dispersible, or silica, in order to improve the adhesive performance and the flow characteristics upon melting. , Kaolin, talc, calcium carbonate, and other fillers.

Further, the above synthetic rubber-based pressure-sensitive adhesives include petroleum softeners such as process oils and extender oils and polyolefins for lowering the melt viscosity of the adhesives and improving the wetting characteristics of the adhesives. Liquid rubber-based softeners such as isobutylene, polybutene, and liquid polyisobutylene, and dibasic ester-based synthetic softeners (synthetic plasticizers) can be used.

The synthetic rubber adhesive can be prepared by melt-kneading the above-mentioned synthetic rubber, tackifier, softener and the like at 100 to 200 ° C.

The isocyanate-terminated polyurethane used for the adhesive moisture-curable hot melt adhesive of the present invention is obtained by adding a polyvalent isocyanate compound having an excess of isocyanate groups to hydroxyl groups contained in the polyol. It is to be prepared.

Examples of the polyol include polyether polyols such as polyethylene glycol, polypropylene glycol and polytetramethylene glycol, phthalic acid, isophthalic acid, terephthalic acid, succinic acid, adipic acid, azelaic acid, sebacic acid, dodecanedioic acid and caprolactone. One or more acid components such as ethylene glycol,
Diethylene glycol, 1,3-propanediol,
Polyester polyol obtained by reacting with a diol component such as 1,4-butanediol and 1,6-hexanediol, further, polyisoprene having a terminal hydroxyl group, polybutadiene having a terminal hydroxyl group, hydrogenated isoprene having a terminal hydroxyl group, and having a terminal hydroxyl group Examples include hydrocarbon polyols such as hydrogenated polybutadiene. Both have a number average molecular weight of 1,
It is desirable to use 000 to 10,000 polyols.

When the number average molecular weight of the polyol is less than 1,000, not only the initial adhesive strength is reduced, but also the adhesive strength is increased, and the time required for reaching the parallel may be increased. On the other hand, if it exceeds 10,000, the melt viscosity becomes high, and not only the coating workability may decrease, but also the wettability with the adherend may deteriorate, and the adhesive strength may decrease. .

As the polyvalent isocyanate compound,
Diisocyanates such as diphenylmethane diisocyanate, tolylene diisocyanate, hexamethylene diisocyanate, xylylene diisocyanate, and isophorone diisocyanate;
Compounds having two or more isocyanate groups in the molecule, such as adducts obtained by adding a diisocyanate compound in a molar amount of twice or more can be used.

When the polyvalent isocyanate compound is generally used as a hot melt adhesive, an adduct having a small isocyanate monomer content is preferred from the viewpoint of maintaining a working environment in order to reduce the vapor pressure of the isocyanate compound.

The isocyanate-terminated polyurethane is prepared by adding an excess polyvalent isocyanate compound to a hydroxyl group contained in a polyol having a number average molecular weight of 1,000 to 10,000, heating the mixture to 100 to 150 ° C. and stirring the polyol. It is desirable to prepare by adding a polyisocyanate compound to the hydroxyl group contained in the component.

A curing catalyst such as dibutyltin dilaurate may be blended with the above-mentioned isocyanate-terminated polyurethane in order to accelerate the curing of the adhesive moisture-curable hot melt adhesive of the present invention.

The adhesive moisture-curable hot-melt adhesive of the present invention comprises a synthetic rubber-based adhesive and an isocyanate-terminated polyurethane as its main components. It is desirable to add a terminal isocyanate type polyurethane to the agent and melt-knead at 100 to 150 ° C quickly. Synthetic rubber-based pressure-sensitive adhesive and isocyanate-terminated polyurethane can be uniformly dispersed or compatible with each other microscopically by melt-kneading, ensuring stable coating workability and exhibiting stable adhesive performance. Yes, it is important.

The weight ratio of the synthetic rubber-based pressure-sensitive adhesive to the isocyanate-terminated polyurethane is 1: 9 to 9: 1, preferably 2: 8 to 8: 2. 10 synthetic rubber adhesives
%, The initial adhesive strength required for temporary fixing becomes insufficient,
On the other hand, when the isocyanate-terminated polyurethane is less than 10%, the heat-resistant adhesive strength is low.

The melt-kneading of the synthetic rubber-based pressure-sensitive adhesive and the isocyanate-terminated polyurethane may be carried out batchwise, but continuously using a static mixer or a line mixer while individually extruding at a specified ratio. It can also be implemented in a targeted manner.

The adhesive moisture-curable hot melt adhesive of the present invention is prepared by melting a synthetic rubber-based adhesive in the presence of a polyol constituting an isocyanate-terminated polyurethane and then adding a polyvalent isocyanate compound to the polyurethane. It can also be obtained by promoting the conversion.

The adhesive moisture-curable hot-melt adhesive of the present invention exhibits sufficient tackiness to provide a temporary fixing function at the initial stage of bonding, and absorbs moisture in the adherend and the air over time. The curing reaction proceeds, and a sufficient adhesive strength as a structural adhesive is developed, and it is most suitable for attaching and insulating a heat insulating material and a soundproofing material to a wall surface or a ceiling surface in a building room.

When attaching the heat insulating material and the soundproofing material to the wall surface and the ceiling surface in the building using the adhesive moisture-curable hot melt adhesive of the present invention, the mass per unit area of the heat insulating material and the soundproofing material is determined. 5 kg / m ² or less, preferably 3 kg
to select the g / ^{m 2.}

In particular, a material having a bulk specific gravity exceeding 5 kg / m ^{2 in the} initial stage of attaching the heat insulating material and the soundproofing material may cause a drop. In particular, when installing on a ceiling surface, 3 kg / m ²
It is desirable to select the following materials. As such a material, a porous material such as a fibrous material or a material obtained by covering these with a knitted fabric, a nonwoven fabric, a film, or the like is desirable.
In particular, it is desirable that at least one kind of fibrous material such as glass wool, rock wool, cellulose cotton, or synthetic fiber is covered with a knitted fabric such as glass fiber or synthetic fiber.

The coating on the heat insulating material and the soundproofing material is not performed on the entire surface of the heat insulating material and the soundproofing material, but is partially performed at a plurality of places in consideration of economy. The amount of the agent used is 10 to 100 g /
m ² , preferably 20 to 80 g / m ² .

In this way, when the heat insulating material, the sound insulating material, and the like are attached to the wall surface and the ceiling surface in the building room, the mass per unit area of the material is restricted, and the excellent temporary fixing at the initial stage of the above-mentioned bonding is performed. Insulation and soundproofing without using auxiliary means such as anchor pins, temporary fixing adhesives, and double-sided adhesive tapes by using adhesive moisture-curable hot melt adhesives that combine functions and excellent adhesive strength over time. Construction is possible.

[0027]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to embodiments. The characteristics and performance in the examples were evaluated by the following methods.

1. Melt Viscosity The melt viscosity of the obtained adhesive moisture-curable hot melt adhesive was measured at 120 ° C. using a Brookfield viscometer.

2. Initial adhesive strength The obtained adhesive moisture-curable hot melt adhesive was
mm at a temperature of 120 ° C. with a thickness of about 200 μm on a long glass fiber fabric having a width of 2 mm.
5kg long slate plate, 1kg / cm
^A test piece was prepared by pressing under pressure at ² . Immediately after producing this test piece, 10 mm /
The shear peel strength was measured at a rate of minutes.

3. Adhesion strength after 7 days The test piece prepared under the above conditions was allowed to stand in a constant temperature bath at 20 ° C. and 60% RH for 7 days, and then the shear peel strength was measured under the above conditions.

4. Heating softening point 100 g and 2 g were added to each of the test pieces after standing for 7 days.
A load of 00 g was applied, the temperature was raised at a rate of 2 ° C./5 minutes, and the temperature when the load was dropped was measured.

5. Coating workability Hot melt hand gun (TS-215 TS / 215)
(HS type), and heated to 120 ° C, coating nozzle diameter 2m
Those which can be smoothly coated at a pressure of 3 kg / cm ² or less at m were evaluated as good.

6. Vibration test Insulation soundproofing material was cut into 430mm x 600mm, and using a hot melt gun, thickness about 0.5mm x width about 15m
mx about 100mm in length and 4.5g /
After coating so as to form a sheet, the sheet was bonded to a slate plate of the same size and having a thickness of 7 mm and cured for 24 hours.
Vibration was carried out at 00 times / minute, and after 24 hours and 48 hours, the lifting displacement between the heat insulating sound insulating material and the slate plate was observed.

Example 1 Styrene isoprene styrene rubber (hereinafter abbreviated as SIS) as synthetic rubber Quintac 343 manufactured by Zeon Corporation
5) 100 parts by mass, 100 parts by mass of a terpene resin (TO-105 manufactured by Yasuhara Chemical Co., Ltd.) as a tackifier and process oil (NS-10 manufactured by Idemitsu Petrochemical Co., Ltd.) as a softening agent
0) 10 parts by mass were melt-kneaded at 180 ° C. for 90 minutes using a horizontal biaxial kneader to prepare a synthetic rubber-based pressure-sensitive adhesive.

The polyol has a number average molecular weight of about 2,80.
0 terminal hydroxyl group type polybutadiene (R, manufactured by Idemitsu Petrochemical Co., Ltd.)
-45HT) 100 parts by mass and diphenylmethane diisocyanate 42 parts by mass (the ratio of hydroxyl group of polyol to isocyanate group of diphenylmethane isocyanate is 1
4 was set) and mixed in a nitrogen gas atmosphere for 120 minutes.
The mixture was heated and stirred at 60 ° C. for 60 minutes to prepare an isocyanate-terminated polyurethane.

Subsequently, 80 parts by mass of the above synthetic rubber-based pressure-sensitive adhesive and 20 parts by mass of the above-mentioned isocyanate-terminated polyurethane were melt-kneaded at 120 ° C. for 60 minutes in a nitrogen atmosphere using a horizontal biaxial kneader to obtain an adhesive moisture. A curable hot melt adhesive was prepared. The obtained adhesive moisture-curable hot melt adhesive was evaluated, and excellent results were obtained as shown in Table 1.

Examples 2 to 4 and Comparative Examples 1 to 2 The same procedure as in Example 1 was repeated except that the synthetic rubber-based pressure-sensitive adhesive and the isocyanate-terminated polyurethane were melt-kneaded at various ratios shown in Table 1. Curable hot melt adhesives were prepared and evaluated. As shown in Table 1, Examples 2 to 4
Are excellent, but the adhesive strength after 7 days is inferior in Comparative Example 1 in which the amount of terminal isocyanate used is small, and the initial adhesive strength is inferior in Comparative Example 2 in which the synthetic rubber-based pressure-sensitive adhesive is small. I understood that.

[0038]

[Table 1]

Example 5 Hydrogenated SIS (Septon 204 manufactured by Kuraray Co., Ltd.) was used as a synthetic rubber.
3) 100 parts by mass, 300 parts by mass of a terpene resin (TO-85 manufactured by Yasuhara Chemical Co., Ltd.) as a tackifier, 50 parts by mass of amorphous polypropylene (Sun Attack P manufactured by Ciba Fine Chemicals Co., Ltd.), and process oil (NS-100) as a softener A synthetic rubber-based pressure-sensitive adhesive was prepared in the same manner as in Example 1, except that 25 parts by mass was kneaded.

The polyol has a number average molecular weight of about 2,50.
100 parts by mass of a polyolefin-based polyol (Epol manufactured by Idemitsu Petrochemical Co., Ltd.) and 100 parts by mass of an adduct prepared by adding 3 mol of diphenylmethane diisocyanate to one molecule of trimethylolpropane (the hydroxyl group of the polyol and the isocyanate group of the adduct) The ratio is 1: 3.8
In the same manner as in Example 1 to prepare an isocyanate-terminated polyurethane.

Subsequently, 70 parts by mass of the synthetic rubber-based pressure-sensitive adhesive and 30 parts by mass of the above-mentioned isocyanate-terminated polyurethane were melt-kneaded in the same manner as in Example 1 to prepare an adhesive moisture-curable hot melt adhesive. Evaluation was performed in the same manner as in Example 1, and the following results were obtained. Melt viscosity: 120 Pa. s Initial adhesive strength: 57 N / 25 mm square 7 days adhesive strength: 924 N / 25 mm square 100 g Heating softening point:> 150 ° C. 200 g Heating softening point:> 150 ° C. Coatability with a hot melt hand gun was also good.

Examples 6 to 8 Bulk specific gravity 32 kg / m ³ (thickness 25 mm), 48 kg / m
³ (thickness 25 mm) and 48 kg / m ³ (thickness 50 m
m) Glass wool was coated with a glass fiber woven fabric, and the adhesive moisture-curable hot melt adhesive prepared in Example 5 was partially applied to a heat insulation material (910 mm in width × 1820 mm in length) using a hot melt gun. (Approximately 40 g) in total (arranged along the four perimeters and the center vertical line), and then applied to concrete walls and concrete ceilings.
After 4 hours, the condition was confirmed, and the results shown in Table 2 were obtained.

Comparative Example 3 Except for using a calcium silicate plate having a specific gravity of 815 Kg / m ³ (thickness: 7 mm), the same procedure as in Examples 6 to 8 was applied to a concrete wall and a concrete ceiling. Upon confirmation, the results shown in Table 2 were obtained.

[0044]

[Table 2]

Example 9 A heat-insulating and sound-insulating material was applied to a 6 mm-thick flexible board surface in the same manner as in Example 6 except that the concrete surface at the place of application was applied. Even after 24 hours, no lifting displacement of the heat insulating and soundproofing material was observed.

[0046]

The adhesive moisture-curable hot-melt adhesive of the present invention exhibits sufficient tackiness to provide a temporary fixing function due to tackiness in the initial stage of bonding, and also shows the adhesion to the adherend and the air in the air with time. The curing reaction proceeds by absorbing moisture, and exhibits sufficient adhesive strength as a structural adhesive.

When applying heat insulating material, soundproofing material and the like to the wall surface and the ceiling surface in the building room, the mass per unit area of the material is limited, and the excellent temporary fixing function in the initial stage of the bonding and the excellent aging. Adhesive and moisture-curable hot melt adhesives that combine excellent adhesive strength with insulation and soundproofing can be achieved without using auxiliary means such as anchor pins, temporary fixing adhesives, and double-sided adhesive tapes. Is what you do.

Moreover, since the adhesive moisture-curable hot melt adhesive used here is a solventless adhesive, it is possible to prevent the working environment from being contaminated, and it is possible to shorten the time required for one-time application of the adhesive. The heat insulating and soundproofing materials can be stuck in time, and the construction period of the heat insulating and soundproofing works can be remarkably shortened.

Claims (2)

[Claims] 1. A synthetic rubber-based pressure-sensitive adhesive, comprising a polyol and a polyisocyanate compound having an isocyanate group in excess of a hydroxyl group contained in the polyol as a main component. A tacky moisture-curable hot melt adhesive characterized in that the rubber-based pressure-sensitive adhesive and the polyurethane are compatible or micro-dispersed, and the mass ratio is 9/1 to 1/9. 2. The adhesive moisture-curable hot melt adhesive according to claim 1, which is partially applied to a plurality of portions of a heat insulating material or a sound insulating material having a mass per unit area of 5 kg / m ² or less.
A paste application method, wherein the paste is applied at a usage amount of 100 g / m ² and applied to a wall surface or a ceiling surface in a building room.