JP6872801B2 - Highly moisture-proof adhesive composition - Google Patents

Description

The present invention relates to a highly moisture-proof adhesive composition.

Conventionally, as an interior member of a door or the like of a house, a flash panel having a sandwich structure in which face materials are bonded to both sides of a frame made of wood material has been used. In the flash panel, when high moisture-proof performance is required, a moisture-proof film is adhered to the back surface of the face material which is the inside of the door. However, in this case, two manufacturing steps are required: after adhering the moisture-proof film to the back surface of the face material, and then adhering the frame material to the moisture-proof film.

On the other hand, a moisture-proof coating composition containing a vinylidene chloride resin is known as a coating material that is applied to an interior member of a house or the like to impart moisture resistance (see, for example, Patent Document 1). Since the vinylidene resin has high crystallinity, the coating of the moisture-proof coating composition can impart excellent moisture-proof properties to the interior member.

Japanese Unexamined Patent Publication No. 11-269425

In the flash panel, in order to simplify the manufacturing process, a moisture-proof coating composition for building materials containing the vinylidene chloride resin is applied instead of the moisture-proof film to form a film, and the film is used as an adhesive to form the frame. It would be convenient if they could be glued together.

However, when the vinylidene chloride resin is used as an adhesive, there is a disadvantage that sufficient adhesive performance cannot be obtained.

An object of the present invention is to provide a highly moisture-proof adhesive composition having excellent adhesive performance while eliminating such inconveniences and imparting excellent moisture-proof properties to the object to be coated by the coating film. To do.

The present inventors have diligently investigated the reason why sufficient adhesive performance cannot be obtained when a moisture-proof coating composition containing a vinylidene chloride resin is used as an adhesive. As a result, it was found that the excellent crystallinity of the vinylidene chloride resin hinders the adhesive performance, and that the excellent crystallinity can be obtained by adjusting the crystallinity, and the present invention has been reached.

Accordingly, high moisture resistance adhesive composition of the present invention, in order to achieve the object, the emulsion containing vinylidene chloride resin, high moisture resistance adhesive comprising a crystallization inhibitor which inhibits crystallization of vinylidene chloride resin The agent composition is characterized by containing the crystallization inhibitor in the range of 1 to 10 parts by mass with respect to 100 parts by mass of the emulsion containing the vinylidene chloride resin.

Since the highly moisture-proof adhesive composition contains a vinylidene chloride resin, it is possible to impart excellent moisture-proof properties to the dry film when it is applied to the object to be coated, while the vinylidene chloride resin is provided by the crystallization inhibitor. The crystallization of the resin can be adjusted to obtain excellent adhesive performance.

In the highly moisture-proof adhesive composition of the present invention, when the content of the crystallization inhibitor is less than 1 part by mass with respect to 100 parts by mass of the emulsion containing the vinylidene chloride resin, the crystallinity of the vinylidene chloride resin is high. It becomes excessive, sufficient adhesion performance that can not be be obtained. Further, in the highly moisture-proof adhesive composition of the present invention, when the content of the crystallization inhibitor exceeds 10 parts by mass with respect to 100 parts by mass of the emulsion containing the vinylidene chloride resin, the crystallization of the vinylidene chloride resin is obtained. becomes too small, that can not be provided with sufficient moisture resistance to the object to be coated.

In the highly moisture-proof adhesive composition of the present invention, examples of the crystallization inhibitor include benzoic acid ester-based plasticizers, acrylic-based plasticizers, adipate ether-based plasticizers, dimethyl succinate, dimethyl adipate, and glutaric acid. One compound selected from the group consisting of dimethyl acid acid, dibutyl diglycol, and butyl carbitol acetate can be used.

The highly moisture-proof adhesive composition of the present invention further preferably contains a viscosity modifier in the range of 0.1 to 10 parts by mass with respect to 100 parts by mass of the emulsion containing the vinylidene chloride resin. The highly moisture-proof adhesive composition of the present invention can have the effect of improving the coatability during work by containing the viscosity modifier. The highly moisture-proof adhesive composition of the present invention is an emulsion containing a vinylidene chloride resin when the content of the viscosity modifier is less than 0.1 parts by mass with respect to 100 parts by mass of the emulsion containing the vinylidene chloride resin. The viscosity may not increase and the coatability may not be improved. Further, in the highly moisture-proof adhesive composition of the present invention, when the content of the viscosity modifier exceeds 10 parts by mass with respect to 100 parts by mass of the emulsion containing the vinylidene chloride resin, a shock of the emulsion occurs, and the emulsion is successfully shocked. It may not be possible to mix.

In the highly moisture-proof adhesive composition of the present invention, examples of the viscosity adjusting agent include acrylic viscosity adjusting agents, urethane viscosity adjusting agents, hydroxymethyl celluloses, hydroxyethyl celluloses, hydroxypropyl methyl celluloses, carboxymethyl celluloses, xanthan gums, and Daiyutan. One compound selected from the group consisting of gum, guar gum, sodium polyacrylate, and silicon dioxide can be used.

Next, embodiments of the present invention will be described in more detail.

The highly moisture-proof adhesive composition of the present embodiment contains an emulsion containing a vinylidene chloride resin and a crystallization inhibitor that inhibits the crystallization of the vinylidene chloride resin, with respect to 100 parts by mass of the emulsion containing the vinylidene chloride resin. , including the crystallization inhibitor in the range of 1 to 10 parts by weight.

The emulsion containing the vinylidene chloride resin may be an emulsion containing a homopolymer of the vinylidene chloride monomer, and the vinylidene chloride monomer and one or more other monomers copolymerizable therewith may be used. It may be an emulsion of the copolymer of. As the vinylidene chloride copolymer latex, for example, each grade product of Saran Latex (registered trademark) manufactured by Asahi Kasei Corporation can be used.

Examples of the crystallization inhibitor include benzoic acid ester-based plasticizers, acrylic-based plasticizers, adipate ether-based plasticizers, dimethyl succinate, dimethyl adipate, dimethyl glutarate, dibutyl diglycol, and butyl carbitol. One compound selected from the group consisting of acetates can be used. The crystallization inhibitor is more preferably a compound having a boiling point of 200 ° C. or higher because it may generate TVOC.

Further, the highly moisture-proof adhesive composition of the present embodiment preferably further contains a viscosity modifier in the range of 0.1 to 10 parts by mass with respect to 100 parts by mass of the emulsion containing the vinylidene chloride resin. Examples of the viscosity adjusting agent include acrylic viscosity adjusting agents, urethane viscosity adjusting agents, hydroxymethyl cellulose, hydroxyethyl cellulose, hydroxypropyl methyl cellulose, carboxymethyl cellulose, xanthan gum, Daiyutan gum, guar gum, sodium polyacrylate, and silicon dioxide. One compound selected from the group can be used.

The highly moisture-proof adhesive composition of the present embodiment is applied to an interior material or the like that requires high moisture-proof properties such as a door or a wall of a house, and imparts excellent moisture-proof properties to the coated object. Due to its excellent adhesive performance, it can be suitably used for applications such as adhering the object to be coated to another adherend. Examples of such an application include an application in which one face material of a flash panel is used as an object to be coated and a frame body is adhered to the face material.

Next, Examples and Comparative Examples of the present invention will be shown.

[Example 1]
In this embodiment, first, 93 parts by mass of vinylidene chloride copolymer latex (manufactured by Asahi Kasei Co., Ltd., trade name: Saran latex L502, solid content 50% by mass) is taken in a glass flask, and the mixture is stirred with a stainless steel stirring blade. , 2 parts by mass of viscosity modifier (manufactured by ADEKA Co., Ltd., trade name: Adecanol UH-420, solid content 30% by mass) and 5 parts by mass of dibutyldiglycol as a crystallization inhibitor (manufactured by Nippon Emulsifier Co., Ltd.) Addition gave a highly moisture-proof adhesive composition.

Next, with respect to the highly moisture-proof adhesive composition obtained in this example, the minimum film-forming temperature, moisture permeation resistance, adhesive strength, and material breaking rate were measured as follows. The results are shown in Table 1.

[Minimum film formation temperature]
The highly moisture-proof adhesive composition obtained in this example is applied to a thickness of 100 μm on a smooth aluminum foil under each temperature environment using a film applicator, and the temperature and film for forming a transparent film are adjusted. The boundary with the temperature at which the film is not formed is measured, and the temperature at which the transparent film is formed is defined as the minimum film formation temperature.

[Moisture permeation resistance]
Measured based on JIS A 1324 "Method for measuring moisture permeability of building materials" 5.2 cup method.

First, the highly moisture-proof adhesive composition obtained in this example is applied to a board paper at ^{an amount of 200 g / m 2} and cured for 2 days as a sample. Next, the surface of the sample is marked in advance so that the range of moisture permeation can be seen, and the sample is attached to a moisture permeation cup containing a predetermined amount of calcium chloride as a hygroscopic agent.

In the moisture permeable cup, an upper portion having an inner dimension of 300 mm square and a depth of 30 mm is continuously provided in a lower portion having an inner dimension of 250 mm square and a depth of 30 mm, and a step portion is formed between the lower portion and the upper portion. There is. The hygroscopic agent is housed in the lower part of the moisture permeable cup, and the sample is attached to the step portion.

Next, while the periphery of the sample attached to the moisture permeable cup is sealed with aluminum tape, the portion of the sample other than the moisture permeable range is sealed with paraffin wax, and moisture permeable from the range other than the moisture permeable range. Prevent it from occurring.

Next, the moisture permeable cup is allowed to stand in a constant temperature and humidity chamber in an environment of 23 ° C. and a relative humidity of 50%, the mass is measured at predetermined time intervals, and the moisture permeability resistance is measured according to the following formula from the mass change. ( ^{M 2} spa / ng) is calculated.

Moisture permeation resistance (m ² spa / ng) = (P _{1 −} P ₂ ) × A / G
P ₁ : Water vapor pressure of air in a constant temperature and humidity chamber (1405.5 Pa, 23 ° C, water vapor pressure in an environment with a relative humidity of 50%)
P ₂ : Water vapor pressure of air in the moisture permeable cup (0 Pa)
A: Moisture permeable area (area of moisture permeable range, m ² )
G: Mass increase per measurement time (ng / s)
[Adhesive strength, material breakage rate]
The highly moisture-proof adhesive composition obtained in this example is applied to the adhesive surface between Lauan plywood and MDF (medium density fiberboard) lined with plywood at a ^{coating amount of 200 g / m 2} (application amount before drying). Then, in an environment of 20 ° C., bonding was performed under the conditions of a pressing pressure of 0.01 MPa and a pressing time of 1 hour, and a plane tensile test was conducted under the conditions of a test area of 40 mm × 40 mm and a test speed of 3.0 mm. The break rate was calculated.

[Example 2]
In this example, 90 parts by mass of vinylidene chloride copolymer latex (manufactured by Asahi Kasei Co., Ltd., trade name: Saran latex L502, solid content 50% by mass), viscosity modifier (manufactured by ADEKA Co., Ltd., trade name: Adecanol UH-420) , Solid content 30% by mass) was 5 parts by mass, and dibutyldiglycol as a crystallization inhibitor (manufactured by Nippon Emulsifier Co., Ltd.) was 5 parts by mass. The composition was obtained.

Next, with respect to the highly moisture-proof adhesive composition obtained in this example, the minimum film-forming temperature, moisture permeation resistance, adhesive strength, and material breaking rate were measured in exactly the same manner as in Example 1. The results are shown in Table 1.

[Comparative Example 1]
In this comparative example, only vinylidene chloride copolymer latex (manufactured by Asahi Kasei Corporation, trade name: Saran Latex L502, solid content 50% by mass) was used as the adhesive composition.

Next, for the adhesive composition of this comparative example, the minimum film forming temperature, moisture permeation resistance, adhesive strength, and material breaking rate were measured in exactly the same manner as in Example 1. The results are shown in Table 1.

[Comparative Example 2]
In this comparative example, 95 parts by mass of vinylidene chloride copolymer latex (manufactured by Asahi Kasei Co., Ltd., trade name: Saran latex L502, solid content 50% by mass), viscosity modifier (manufactured by ADEKA Co., Ltd., trade name: Adecanol UH-420) , Solid content 30% by mass), and the same as in Example 1 except that no crystallization inhibitor was used to obtain an adhesive composition.

Next, with respect to the adhesive composition obtained in this comparative example, the minimum film forming temperature, moisture permeation resistance, adhesive strength, and material breaking rate were measured in exactly the same manner as in Example 1. The results are shown in Table 1.

From Table 1, the highly moisture-proof adhesion of Examples 1 and 2 containing an emulsion containing a vinylidene chloride resin (vinylidene chloride copolymer latex) and dibutyldiglycol as a crystallization inhibitor that inhibits the crystallization of the vinylidene chloride resin. According to the agent composition, the minimum film-forming temperature is as low as 5 ° C., the adhesive strength and the material breaking rate are large, the adhesive performance is excellent, the moisture permeation resistance is high, and the object to be coated is provided with excellent moisture resistance. It is clear that it can be done.

On the other hand, a comparison consisting only of an emulsion containing a vinylidene chloride resin (vinylidene chloride copolymerized latex) or containing an emulsion containing a vinylidene chloride resin (vinylidene chloride copolymerized latex) and a viscosity modifier and not containing the crystallization inhibitor. According to the adhesive compositions of Examples 1 and 2, the moisture permeation resistance is higher than that of Examples 1 and 2, but the minimum film-forming temperature is as high as 23 ° C. It is clear that it does not have the performance.

Claims (4)

A highly moisture-proof adhesive composition containing an emulsion containing a vinylidene chloride resin and a crystallization inhibitor that inhibits the crystallization of the vinylidene chloride resin. A highly moisture-proof adhesive composition comprising an crystallization inhibitor in the range of 1 to 10 parts by mass. In the highly moisture-proof adhesive composition according to claim 1 , the crystallization inhibitor is an benzoic acid ester-based plasticizer, an acrylic-based plasticizer, an adipate ether-based plasticizer, dimethyl succinate, dimethyl adipate, and glutaric acid. A highly moisture-proof adhesive composition, which is one compound selected from the group consisting of dimethyl, dibutyl diglycol, and butyl carbitol acetate. The highly moisture-proof adhesive composition according to claim 1 or 2 , characterized in that the viscosity modifier is contained in the range of 0.1 to 10 parts by mass with respect to 100 parts by mass of the emulsion containing the vinylidene chloride resin. Highly moisture-proof adhesive composition. In the highly moisture-proof adhesive composition according to claim 3 , the viscosity adjusting agent includes an acrylic viscosity adjusting agent, a urethane viscosity adjusting agent, hydroxymethyl cellulose, hydroxyethyl cellulose, hydroxypropyl methyl cellulose, carboxymethyl cellulose, xanthan gum, and Daiyutan gum. A highly moisture-proof adhesive composition, which is one compound selected from the group consisting of guar gum, sodium polyacrylate, and silicon dioxide.