JP2014105461A - Adhesive application method for floor construction - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an adhesive application method for floor construction with which labor for application work can be reduced, the quantity of an adhesive to be applied can be reduced, the quantity of the adhesive to be applied per unit area can be easily adjusted on the job site, and an environmental load can be reduced.SOLUTION: An adhesive application method for floor construction is characterized in that (1) air is mixed into an aqueous emulsion adhesive so as to reach a preset foaming ratio and the adhesive is foamed and applied onto a floor underlayer and (2) the aqueous emulsion type adhesive is an acrylic resin based aqueous emulsion type adhesive.

Description

  The present invention relates to a method for applying an adhesive for floor construction.

An aqueous emulsion type adhesive is known as an adhesive for floor construction (Patent Documents 1 and 2). Since this adhesive has advantages such as being suitable for occupational safety and health problems and environmental problems as compared with the solvent-type adhesive, it tends to be used more than the solvent-type adhesive. Usually, this adhesive is contained in a metal can or a plastic container, and a necessary amount is taken out from the can or the container at the time of construction, and is spread and spread on the floor base with a squeeze. In this case, there is a problem that a considerable amount of unusable adhesive remains in the can or container, and the empty can or container becomes industrial waste.
As the aqueous emulsion adhesive, for example, an acrylic resin-based adhesive is commercially available, and the specific gravity is 1.3 to 1.4 g / cc, and the coating amount is about 1.3 to 1.5 Kg / m ² .
However, it is very hard work to apply such an adhesive on a large area with a crisp iron, and it is also required to reduce the coating amount in order to reduce costs. In addition, alternative fluorocarbons and flammable gases (LPG) are added to the adhesive, and a method of spraying them in a pressurized container is also being studied. However, because these gases are released into the environment together with the adhesive, There is also the problem of adversely affecting the environment.

JP 2002-285112 A JP 2003-082313 A

  The present invention provides an adhesive coating method for floor construction that can reduce the labor of coating work, can reduce the coating amount, can easily adjust the coating amount per unit area on site, and can reduce the environmental load. Objective.

The present inventor has found that the above problems can be solved by mixing a water-based emulsion adhesive and air to form a foam-like adhesive, and has completed the present invention.
That is, the above-mentioned problems are solved by the following inventions 1) to 2).
1) An adhesive coating method for floor construction, wherein air is mixed in a water-based emulsion type adhesive so as to have a preset foaming ratio and foamed to be coated on a floor base.
2) The adhesive application method for floor construction according to 1), wherein the aqueous emulsion adhesive is an acrylic resin-based aqueous emulsion adhesive.

  According to the present invention, an adhesive coating method for floor construction that can reduce the labor of coating work, can reduce the coating amount, can easily adjust the coating amount per unit area at the site, and can reduce the burden on the environment. Can be provided.

Hereinafter, the present invention will be described in detail.
Aqueous emulsion type adhesives used in the present invention include acrylic resin, urethane resin, vinyl acetate resin, etc., which can be appropriately selected and used according to the construction object. Is preferred.
The acrylic resin-based aqueous emulsion adhesive is an adhesive composed of an aqueous dispersion of an acrylic resin obtained from a monomer mainly composed of an acrylic acid alkyl ester and / or a methacrylic acid alkyl ester. A product having a formulation of 30% by mass, 5-10% by mass of a rosin resin, 30-50% by mass of an inorganic filler such as calcium carbonate, and about 20-40% by mass of water is commercially available. Specific examples include cement AK manufactured by Tajima, JA-7562 manufactured by 3M, A-6001 manufactured by Regex, 1541C manufactured by ThreeBond, and the like.

In order to make a foam-like adhesive, a foam pump, a hand mixer, a commercial foam discharge device (for example, a device that mixes an adhesive together with compressed air by the venturi effect disclosed in Japanese Patent Application Laid-Open No. 2006-212086 and discharges it into a foam shape. ) Etc. are available.
Moreover, you may add additives, such as a foam stabilizer, to an adhesive agent as needed.
The concentration (ratio of dispersoid) of the adhesive (hereinafter sometimes referred to as adhesive stock solution) before foaming is not particularly limited, but is usually about 5 to 15% by mass.
In the present invention, air is mixed into the adhesive stock solution so as to obtain a foaming ratio set in advance, thereby forming a foam. At that time, whether or not the desired expansion ratio has been reached can be determined based on the specific gravity reduction rate or the volume increase rate. The specific gravity reduction rate can be easily measured with a hydrometer, and the volume increase rate is a visual indication of how many times the amount of foamy adhesive in the container containing the adhesive has increased relative to the amount of the adhesive stock solution. Observe by such means.

When determining the expansion ratio by the specific gravity reduction rate, about 1/5 to 4/5 of the specific gravity of the adhesive stock solution is preferable. Moreover, when determining by a volume increase rate, about 1.3 to 5 times the volume of the adhesive agent stock solution is preferable.
If it is the said range, since it can dilute, maintaining the function as an adhesive agent, the application quantity of the adhesive agent per unit area can be reduced reliably. Further, since the viscosity of the adhesive is lowered, it is easy to apply and the labor of the application work can be reduced. Further, in the present invention, air can be mixed with the adhesive so as to have a preset dilution ratio, so that the amount of adhesive applied per unit area can be freely controlled according to the construction object, Since the amount of adhesive can be changed by easily adjusting the amount of air mixed at the construction site, the degree of freedom in construction becomes very large, which is very useful as a field technology. Furthermore, unlike the prior art, no substitute chlorofluorocarbon or flammable gas (LPG) is used, so the burden on the environment can be significantly reduced.

  EXAMPLES Hereinafter, although an Example and a comparative example are shown and this invention is demonstrated further more concretely, this invention is not limited by these Examples. In the examples, “part” is “part by mass”.

Example 1
100 parts (solid conversion) of acrylic acid-2-ethylhexyl-methyl methacrylate copolymer aqueous dispersion (glass transition temperature, -58 ° C.), 20 parts of tripropylene glycol monobutyl ether, calcium carbonate (volume average particle diameter 20 μm) 50 parts, 2 parts of sodium polyacrylate are added and stirred, and an acrylic resin aqueous emulsion type having a specific gravity of 1.3 [g / cc] and a viscosity of 3.0 [× 10 ⁻³ Pa · s] (20 ° C.) An adhesive was prepared.
Next, 100 parts of water and 2 parts of a silicone-based foam stabilizer (BYK S8020 manufactured by BYK) are added, and the air is mixed with a foaming stirrer (Remacom mixer, RM-G10A, wire whip specification), and the specific gravity is 0. A foam adhesive of 0.5 to 0.9 g / cc was prepared, and an adhesion test of PVC flooring (P tile and permalum) manufactured by Tajima Co., Ltd. was performed according to JIS A5536.
In the floor tile adhesion test, each adhesive was applied to a flexible board with a thickness of 8 mm using a crease, and the flooring material with the steel attachment specified in JIS was pasted after the open time, followed by normal curing for 168 hours. Then, the strength per unit area was measured.
In the test of the floor sheet, an adhesive was applied to a flexible plate having a size of 150 mm × 70 mm and a thickness of 8 mm, a floor sheet of 25 mm × 200 mm was pasted, aging was carried out for 168 hours, and the adhesive strength was measured by peeling at 90 degrees.
The results are shown in Table 1 below.

アクリル樹脂系エマルジョン型接着剤の場合、上記ＪＩＳでは接着強度０．２Ｎ／ｍｍ^２（床タイル）、１０Ｎ／２５ｍｍ（床シート）以上と規定されている。
これに対し、上記表１の結果は、夫々、０．３Ｎ／ｍｍ^２、１２Ｎ／２５ｍｍであり、いずれもＪＩＳの規定を十分満足するものであった。

In the case of an acrylic resin emulsion adhesive, the above JIS specifies that the adhesive strength is 0.2 N / mm ² (floor tile), 10 N / 25 mm (floor sheet) or more.
On the other hand, the results of Table 1 above were 0.3 N / mm ² and 12 N / 25 mm, respectively, and both sufficiently satisfied the JIS regulations.

表２の結果から判るように、作業者Ａ〜Ｃ間でバラツキが見られたが、泡タイプの接着剤は、既存接着剤と比べて塗布量が１／３〜２／３で済み、作業時間も２０〜５０％削減できた。 Next, for workability, a test construction place of 20 m ² was prepared, and the work time (application time) by three workers was measured and evaluated. Cement AK manufactured by Tajima Corporation was used as the existing adhesive.
The results are shown in Table 2 below.

As can be seen from the results in Table 2, variations were observed among the workers A to C, but the foam type adhesive required only 1/3 to 2/3 of the application amount compared to the existing adhesive, The time was also reduced by 20-50%.

表３の結果から判るように、作業者Ａ〜Ｃ間でバラツキが見られたが、泡タイプの接着剤の場合は、既存接着剤の場合と比べて、塗布量が１／３〜２／３で済み、作業時間も５０〜６６％削減できた。
また、接着強度についてもＪＩＳ Ａ ５５３６の規定「１０Ｎ／２５ｍｍ（床シート）以上」を満足する結果が得られた。 Example 2
The adhesive prepared in Example 1 was mixed with air with a coating apparatus described in JP-A-2006-212086 to form a foam and coated on the floor substrate.
The workability in this case was compared with the case where the existing adhesive was applied with a comb-shaped iron.
That is, a test construction place of 20 m ² was prepared in the same manner as in Example 1, and the working time by three workers was measured and evaluated.
Further, after application of the adhesive, a floor sheet (product name Permalum) manufactured by Tajima Co., Ltd. was attached, and after 168 hours, a cutter blade was inserted with a width of 25 mm, and the 90-degree peel strength of the floor sheet was measured.
The results are shown in Table 3.

As can be seen from the results in Table 3, variation was observed among the workers A to C, but in the case of the foam type adhesive, the coating amount was 1/3 to 2 / compared with the case of the existing adhesive. 3 and the working time was reduced by 50 to 66%.
Moreover, the result which satisfy | fills prescription | regulation "10N / 25mm (floor sheet) or more" of JISA5536 was obtained also about adhesive strength.

Claims (2)

  An adhesive coating method for floor construction, wherein air is mixed into a water-based emulsion type adhesive so as to have a preset foaming ratio, and the foam is coated on a floor base.   2. The adhesive application method for floor construction according to claim 1, wherein the aqueous emulsion adhesive is an acrylic resin-based aqueous emulsion adhesive.