JP2003301134A - Insulating composition in the form of coating material and method for forming insulating film - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain an insulating composition in the form of a coating material which is suitably employed in forming a waterproof film on a wall surface of a building, or the like, and can form the film excellent in flexibility, and to provide a method for forming a hardly water-leaking, flexible insulating film on an object using the insulating composition in the form of the coating material. <P>SOLUTION: The insulating composition in the form of an aqueous emulsion- based coating material comprises an acrylic copolymer mainly composed of an acrylate and 0.1-150 pts.wt., based on 100 pts.wt. of the copolymer, of an auxiliary insulating agent. The method for forming the insulating film comprises applying and drying an aqueous emulsion comprising the acrylic copolymer mainly composed of the acrylate on an object to give a substrate waterproof film and applying and drying the insulating composition in the form of the aqueous emulsion-based coating material on the substrate waterproof film. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a paint type insulating composition and a method for forming an insulating film. More specifically, an aqueous emulsion-based coating type insulating composition that is preferably used when forming a waterproof coating film (hereinafter simply referred to as a waterproof film) on the wall surface of a building, and this aqueous emulsion-based coating composition The present invention relates to a method for forming an insulating film on the surface of an object to be waterproofed with an insulating composition.

[0002]

2. Description of the Related Art Conventionally, the walls of buildings, roofs, balconies, balconies, bathrooms, washing machines, and other floor surfaces are often waterproofed. The waterproof treatment includes a method of applying a paint to form a relatively thick waterproof film, and a method of combining a waterproof film or sheet (hereinafter simply referred to as a waterproof film) and mortar concrete to form a waterproof layer. Has been adopted.

As a paint for the purpose of forming a relatively thick waterproof film, a solvent-based paint containing a urethane resin as an active ingredient and an aqueous paint containing an aqueous emulsion resin as an active ingredient are used. There is. The solvent-based reactive coating requires a step of uniformly mixing a curing agent and a curing accelerator before coating, a step of scattering the solvent after coating, and a step of further causing a crosslinking reaction. ,
If the operation is complicated and there is poor stirring in the mixing process, the quality of the waterproof membrane will deteriorate. Further, it is necessary to wash the applicator, work clothes, etc. to which the paint adheres with a solvent, which has the drawback of contaminating the work environment.

Since the water-based emulsion waterproof paint does not use a solvent, it does not require a step of scattering the solvent.
If a thick waterproof film is formed all at once, skinning will occur on the surface and the scattering of water from the inside will be impeded, which will take a long time to dry or cure, and after the water has scattered, many small cracks will form on the waterproof film surface. (Cracks) are liable to occur, the finished appearance is inferior, and in some cases rainwater penetrates through these cracks, so that the purpose of waterproofing cannot be achieved.

A method of forming a waterproof layer by combining a waterproof film and mortar concrete is to apply a suitable primer to a concrete base, lay a waterproof film such as a polyethylene film on the primer, and further mortar concrete on it. It covers and protects the waterproof layer. In this method, when a crack occurs in the concrete base, the waterproof film firmly adhered to it is damaged at the same time, and when a crack occurs in the protective mortar concrete layer, it is firmly adhered to this. The waterproof film may be damaged and leak water at the same time. Further, when this construction method is effective when the place where the waterproof layer is formed is flat, in a place where there are many uneven portions instead of a flat surface, it requires skill in cutting and attaching the waterproof film. There is a drawback that it takes a long time to form the waterproof layer.

As a waterproof paint for walls of buildings and the like, a paint mainly composed of bitumen has been put into practical use, but it is necessary to heat the paint composition at the time of application, odor is generated when heated, and dry Alternatively, there is a drawback that it takes a long time to cure. In order to eliminate these drawbacks,
A method of mixing it with an emulsified water-based waterproof paint has been proposed and put to practical use, but it still has the drawback that skin is likely to be skinned and water is trapped by the skin, which requires a long time for drying and curing. There is.

In order to solve the above-mentioned drawbacks, conventionally, (1) a thin waterproof film is first formed, and a coating film having a desired thickness is formed by coating the coating film a plurality of times. Method, (2)
A method utilizing a hydration reaction such as cement mortar has been adopted. However, the method of overcoating in (1) above is not only complicated and has many steps, but it also has a drawback that it takes a long time to complete the coating work, and the cost is high. In the method utilizing the reaction, it is necessary to prepare the coating composition immediately before forming the waterproof film, and addition of cement powder lowers the important stretchability of the waterproof film, further restricting the work procedure. There is a drawback that.

[0008]

In view of the above situation, the present inventors did not use a solvent, did not contaminate the work environment, and did not use a solvent when washing a coating tool, work clothes, etc. to which paint was attached. Does not need to be used, is not restricted by the surface condition of the object to be waterproofed, and forms an insulating layer that insulates (blocks) these effects even if cracks occur in the concrete foundation or the mortar concrete layer on the front side. As a result of extensive studies to provide a coating type insulating composition and a method for forming an insulating film,
The present invention has been completed.

[0009]

In order to solve the above-mentioned problems, in the first invention, an acrylic copolymer having an acrylic ester as a main component and 100 parts by weight of this copolymer are provided with a waterproofing aid. Provided is an aqueous emulsion-based coating type insulating composition characterized by being mixed in an amount of 0.5 to 100 parts by weight.

Further, in the second invention, in the method of forming an insulating film on the surface of an object to be waterproofed, first, an aqueous emulsion (B) containing an acrylic copolymer whose main component is an acrylic ester is applied. And dried, and then an acrylic copolymer whose main component is an acrylic ester,
0.5 to 100 parts by weight of this copolymer, 0.5 to
Provided is a method for forming an insulating film, which comprises applying an aqueous emulsion-based paint type insulating composition (A) containing 100 parts by weight and drying.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail below.
Aqueous emulsion-based paint type insulation composition according to the present invention (A)
In the following description, simply referred to as the paint type insulating composition (A)}, the component forming the insulating film is an acrylic ester (a1)
Is an acrylic copolymer (A1) containing as a main component a copolymerized with a monomer copolymerizable therewith. Acrylic ester
(A1) as a monomer that can be copolymerized, aromatic vinyl-based monomer component (a2), carboxylic acid monomer component (a3)
And the silane compound component (a4). The monomers to be copolymerized may be a single kind or a mixture of two or more kinds. In the present invention, "insulation" means that it is interposed between the concrete base and the mortar concrete layer, and does not affect the other by the effect of the cracks generated in either one, and means that the effect of the cracks is blocked. .

In the present invention, the acrylic ester means
It means an acrylic copolymer containing as a main component an alkyl ester ester (a1) of acrylic acid or methacrylic acid. Specifically, methyl acrylate, ethyl acrylate, propyl acrylate, butyl acrylate, pentyl acrylate, hexyl acrylate, 2-ethylhexyl acrylate, octyl acrylate, nonyl acrylate, decyl acrylate, etc. Acrylic acid alkyl esters, methyl methacrylate, ethyl methacrylate, propyl methacrylate, butyl methacrylate, pentyl methacrylate, hexyl methacrylate, -21-ethylhexyl methacrylate, octyl methacrylate, nonyl methacrylate, decyl methacrylate, etc. Methacrylic acid alkylesters. These may be used alone or as a mixture of two or more kinds.

The acrylic copolymer (A1) is copolymerized with the aromatic vinyl monomer component (a2) in an amount of less than 20% by weight based on the total amount of the acrylic copolymer (A1). It is preferable to include the Examples of the aromatic vinyl monomer component (a2) include styrene, alkyl-substituted styrene, halogen-substituted styrene, vinyltoluene and the like.

The acrylic copolymer (A1) is copolymerized with the carboxylic acid monomer component (a3) in an amount of 0.1 to 5% by weight based on the total amount of the acrylic copolymer (A1). It is preferable to include the Carboxylic acid monomer is an acrylic copolymer
Functions to give flexibility to (A1). Examples of the carboxylic acid monomer (a3) include acrylic acid, methacrylic acid and itaconic acid.

The acrylic copolymer (A1) contains the silane compound component (a4) in an amount of 0.5 to 10% by weight based on the total amount of the acrylic copolymer (A1). Preferably. The silane compound (a4) imparts hydrophobicity to the acrylic copolymer (A1). Examples of the silane compound (a4) include γ-2 aminoethylaminopropyltrimethoxysilane, γ-2 aminoethylaminopropylmethyldimethoxysilane, γ-2 aminoethylaminopropyltrimethoxysilane, γ-methacryloxypropyltrimethoxysilane. , Γ-glycidoxypropyltrimethoxysilane, γ-mercaptopropyltrimethoxysilane, vinyltriacetoxysilane, γ-anilinopropyltrimethoxysilane, vinyltrimethoxysilane, γ-glycidoxypropylmethyldimethoxysilane, γ- Ureidopropyltriethoxysilane, methyltrimethoxysilane, methyltriethoxysilane, dimethyldimethoxysilane, trimethylmethoxysilane, isobutyltrimethoxysilane, phenyltrimethoxysilane, etc. Be done.

The acrylic copolymer (A1) is an alkyl ester ester of acrylic acid or methacrylic acid (a).
1) as the main component, if necessary, aromatic vinyl monomer component
(a2), the carboxylic acid monomer component (a3), and / or the silane compound component (a4) are allowed to coexist and produced by an emulsion polymerization method using water as a medium. As the emulsifier, the polymerization initiator and the like that can be used in this emulsion polymerization method, those used when producing this kind of polymer by the emulsion polymerization method can be used without limitation. The obtained aqueous emulsion can be used as it is as a component for preparing the coating type insulating composition (A).

The coating type insulating composition (A) according to the present invention comprises:
Insulation aid (A2) is mixed. The insulating aid (A2) imparts hydrophobicity to the paint type insulating composition (A) and at the same time imparts flexibility to the insulating film. Examples of the insulating aid include waxes (a21), silicon compounds (a22), fluorine compounds (a23), surfactants (a24) and the like. These insulation aids (A2)
May be a single compound or a mixture of two or more compounds.

As the waxes (a21), candeli wax, carnauba wax, rice wax, wood wax,
Plant wax such as jojoba oil, animal wax such as beeswax, lanolin, whale wax, montan wax,
Mineral waxes such as ozokerite and ceresin, paraffin wax, microcrystalline wax, petroleum wax such as petrolatum, Fischer-Tropsch wax, polyethylene oxide, synthetic hydrocarbon wax such as polyethylene wax and acrylic ethylene copolymer wax, montan wax derivative , Paraffin wax derivative, modified wax such as microcrystalline wax derivative, hydrogenated wax such as hardened castor oil, hardened castor oil derivative, etc., 12-hydroxystearic acid, stearic acid amide, phthalic anhydride imide, bisamide, amide, glycerin ester, sorbitan Examples thereof include esters, higher alcohols (C12 or higher), higher fatty acids, and the like. These waxes (a21)
Preferably has a melting point in the range of 15 to 250 ° C, and more preferably 60 to 170 ° C.

In the present invention, silicon compounds (a22)
Means a compound having a siloxane bond skeleton in the molecule, specifically, a dimethylpolysiloxane-based compound, a methylphenylpolysiloxane-based compound, a cyclic dimethylpolysiloxane-based compound, a fluoropolysiloxane-based compound, and amino groups thereof. Examples include modified products, epoxy modified products, polyether modified products, alcohol modified products, fluorine modified products, mercapto modified products, carboxyl modified products, and alkyl higher fatty acid modified products. These silicon compounds (a
The form 22) may be in the form of oil, powder, emulsion or aqueous solution.

In the present invention, the fluorine-based compound (a23) means a molecular weight of 100 having a fluoroalkyl group in the molecule.
It means about 0 to 25,000. Specific examples include perfluoroalkylcarboxylic acid salts, perfluoroalkylphosphoric acid esters, perfluoroalkyltrimethylammonium salts, perfluoroalkylpentanones, and perfluoroalkylethylene oxide adducts.

In the present invention, the surfactants (a24) are
It means a compound having both a hydrophilic group and a hydrophobic group in the molecule. Specifically, it may be any of anionic surfactants, cationic surfactants, amphoteric surfactants, nonionic surfactants and the like.

The mixing ratio of these insulation aids (A2) is 0.5 to 150 parts by weight based on 100 parts by weight of the acrylic copolymer (A1) (solid content) contained in the coating type insulating composition (A). Part. When the wax (a21) is used as the insulation aid (A2), it is more preferably 30 to 100 parts by weight, and further preferably 50 to 100 parts by weight, relative to 100 parts by weight of the acrylic copolymer (A1). Is. When a silicon compound (a22) or a fluorine compound (a23) is used as the insulation aid (A2), the acrylic copolymer 100 is more preferable.
The amount is 0.1 to 30 parts by weight, and more preferably 0.5 to 20 parts by weight, based on parts by weight.

The coating-type insulation composition (A) according to the present invention is prepared by adding the insulation aid (A2) to the emulsion-type acrylic copolymer (A1) obtained by emulsion polymerization while maintaining the emulsion form. ) Is mixed. At this time, the surfactants (a24) mixed in the paint-type insulating composition (A) are waxes (a24).
21), silicon compounds (a22), fluorine compounds (a2
It functions to disperse 3) etc. in water and maintain a stable emulsion form. Paint-type insulating composition (A), if the solid content in the whole is too small, it is difficult to increase the thickness of the insulating film formed by applying this, if the solid content is too large,
The viscosity becomes too high, which makes it difficult to form an insulating film, which is not preferable. Preferred solid content {acrylic copolymer
The total concentration of (A1) and insulation aid (A2)} is in the range of 30 to 70% by weight.

The coating type insulating composition (A) according to the present invention comprises:
If necessary, other additives can be added. Other additives that can be blended include, for example, organic fibers, thickeners, defoamers, antiseptics, rust inhibitors, dispersants, wetting agents, antistatic agents, flame retardants, colorants, antioxidants, and ultraviolet rays. Examples include absorbents. In order to secure an appropriate thixotropy to the paint type insulating composition (A), it is preferable to add a thickener, a dispersant and the like.

Next, a method of forming an insulating film on the surface of an object by the method according to the second aspect of the present invention will be described. The object on which the insulating film can be formed is a wall surface of a building, a roof, a balcony, a wall surface such as a veranda, a bathroom, a floor of a laundry room, and the like, and the surface of the object may be flat or uneven.

First, a suitable primer layer is formed on the surface of an object, an aqueous emulsion (B) containing an acrylic copolymer containing acrylic acid esters as a main component is applied and dried. Aqueous emulsion containing acrylic copolymer
Examples of (B) include an aqueous emulsion-based waterproof coating composition described in JP-A 2000-129164. The coating method may be, for example, a brush coating method, a roller coating method, a flow coating method, a spray coating method, or the like. The thickness of the coating film of this aqueous emulsion (B) can be selected in the range of 0.5 to 5 mm depending on the type of building, the place to be waterproofed, and the like.

After the coating film of the aqueous emulsion (B) is dried, the coating type insulating composition (A) according to the first invention is applied to the surface and dried. The coating type insulating composition (A) may be applied by any of a brush coating method, a roller coating method, a flow coating method, an air spray coating method, an airless spray coating method and the like. The thickness of the coating film formed by the paint-type waterproof composition (A) can be selected in the range of 0.5 to 5 mm depending on the type of building, the place to be waterproofed, and the like. Aqueous emulsion (B) and paint type insulation composition (A)
The insulating coating film can be dried by a natural drying method, but can also be dried by a forced drying method using hot air. Paint type insulating composition (A) according to the present invention
The insulating coating film formed by the method has a high drying speed and yet is unlikely to cause cracks on the surface.

In order to form a waterproof layer on a concrete building, a water-proof emulsion (B) is then applied to form a waterproof coating film, on which the paint-type insulating composition (A) according to the first invention is formed.
Is applied and dried to form an insulating film. A waterproof layer can be formed by forming a protective layer of mortar concrete on the insulating film. Aqueous emulsion
When the insulating film of the paint type insulating composition (A) according to the first invention is formed between the waterproof coating film of (B) and the protective layer made of mortar concrete, the insulating film is highly flexible,
Since it has excellent waterproofness, cracks in the concrete base and / or cracks in the mortar concrete protective layer are not absorbed by the insulating film and do not extend into multiple layers, and the waterproof layer does not leak water.

[0029]

EXAMPLES The present invention will be described below in detail based on examples, but the invention is not limited to the following examples as long as the gist thereof is not exceeded.

[Production Example I] In a four-liter flask equipped with a reflux condenser, a stirrer, a thermometer and a dropping funnel and having a capacity of 2 liters, 274 parts of deionized water and 4 parts by weight of 30% sodium lauryl sulfate product were added. It was charged and kept at a temperature of 83 ° C. with stirring. To this flask, 2 parts of ammonium persulfate was added, and after 3 minutes, a monomer mixture obtained by mixing the components shown in Table 1 below was continuously added dropwise over 180 minutes,
Copolymerization was carried out by an emulsion polymerization method. 30 more after continuous dropping
The temperature was kept at 83 ° C. for a period of time for copolymerization. The copolymerization reaction product has a solid content of 50% by weight and a viscosity of about 1000 mP · s.
(Temperature 30 ° C., BM type viscometer, 60 rotations), pH is 8.
5. The acrylic ester copolymer emulsion (I) had a minimum film forming temperature (MFT) of 5 ° C.

[0031]

[Table 1]

[Production Example II] In the example described in Production Example 1, emulsification was carried out in the same procedure as in the same example except that 10 parts by weight of triethoxysilane was added to the monomer mixture shown in Table 1. Acrylic acid copolymer emulsion (II) was produced by copolymerization by a polymerization method.

[Example 1] 100 parts by weight (solid content) of acrylic acid ester copolymer emulsion (I) was added to a wax-type waterproofing aid (manufactured by Futaba Fine Chemical Co., trade name: C).
100 parts by weight of W1500) were added and mixed uniformly to obtain an insulating composition 1.

Example 2 A wax (manufactured by Futaba Fine Chemical Co., trade name: CW150) was added to 100 parts by weight (solid content) of the acrylic ester copolymer emulsion (I).
50 parts by weight of 0) are added and mixed uniformly to obtain an insulating composition 2
Got

[Example 3] 100 parts by weight (solid content) of acrylic acid ester copolymer emulsion (I) was added to a silicon compound (manufactured by Toshiba Silicon Co., trade name: TSF444).
5) 30 parts by weight, 2 parts by weight of polyoxyethylene sorbitan monooleate, and 68 parts by weight of deionized water were mixed, and 20 parts by weight of the emulsion was added to obtain an insulating composition 3.

Example 4 A wax (manufactured by Futaba Fine Chemical Co., trade name: CW150) was added to 100 parts by weight (solid content) of the acrylic ester copolymer emulsion (II).
0) was mixed in an amount of 50 parts by weight to obtain insulating composition 4.

[Test Example] Concrete flat plate (90 mm × 1)
80 mm x 20 mm), a primer (made by Asahi Glass Co., Ltd., product name: Saracene) is applied to a thickness of 2 mm (after drying), and an acrylic copolymer containing acrylate as a main component as a base waterproofing agent is applied thereon. A water-based emulsion containing the product (manufactured by Mitsubishi Kagaku Shisan Co., Ltd., trade name: Mileufa-HG) was applied by a brush coating method and dried at room temperature, and the thickness after drying was 2
An undercoat waterproof film of mm was formed. The insulating composition prepared by the method described in Examples 1 to 4 was applied on the base waterproof film by a brush coating method at 100 g / m ² and dried at room temperature to obtain an insulating film having a thickness of 20 μm. Was formed. On this insulating film, mortar concrete having a weight ratio of mortar and sand of 2: 1 was struck to a thickness of 1 cm and cured for 4 weeks.

A test piece having a size of 4 cm × 4 cm was cut out from an arbitrary portion of a concrete flat plate in which three layers of an underwater waterproofing film, an insulating film and a mortar concrete layer were integrated, and the concrete flat plate and the mortar concrete layer of this test piece were cut out. And a tensile tester (Shimadzu autograph, model:
S-2000) and held at a temperature of 23 ° C., relative humidity of 60% and a pulling speed of 10 mm / min to measure the force (peeling strength) when the interface between the mortar concrete layer and the insulating film peels off. . The same applies to the case where only the acrylic ester copolymer (A) layer containing no insulating aid is provided (comparative example) and the case where a polyethylene film layer is provided instead of the insulating film (reference example). The peel strength was measured. The measurement results are shown in Table-2.

[0039]

[Table 2]

The following is clear from Table-2. (1) The peel strength between the insulating film made of the coating type insulating composition (A) according to the present invention and the mortar concrete layer is as small as the waterproof layer in which the polyethylene film is arranged, and is highly flexible (Examples 1 to Example 4 and Reference Examples). (2) On the other hand, the layer containing no insulating aid has high strength (see Comparative Example), and when cracks occur in the mortar concrete layer, the cracks are easily transmitted to the lower layer through the rigid waterproof layer.

[0041]

As described above in detail, the present invention has the following particularly advantageous effects, and its industrial utility value is extremely large. 1. The paint-type insulating composition according to the present invention has a fast drying speed even when a thick waterproof film is formed, and cracks are unlikely to occur on the surface. 2. Since the paint-type insulating composition according to the present invention does not contain an organic solvent, it does not contaminate the working environment, and it is not necessary to use a solvent when washing the applicator, work clothes, etc. to which the paint is attached. 3. The coating type insulating composition according to the present invention can be applied by a brush coating method, a roller coating method, a flow coating method, an air spray coating method, an airless spray coating method, etc., so that it is easy even when the target object shows unevenness instead of flatness. A waterproof film can be formed on. 4. Since the paint-type insulating composition according to the present invention is highly flexible, the flexible insulating film does not absorb the deformation and transmit it to the lower layer even when a crack occurs in the mortar concrete layer, so that the waterproof layer as a whole leaks water. There is nothing to do.

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) C09D 133/02 C09D 133/02 143/04 143/04 183/04 183/04 191/06 191/06 201 / 04 201/04 H01B 3/44 H01B 3/44 A (72) Inventor Shigetomo Yamamoto 3-2, Chuo 8-chome, Ami-cho, Inashiki-gun, Ibaraki Mitsubishi Chemical Industrial Co., Ltd. (72) Inventor Nakagawa Narakou 1762 Kitaoi, Kasamatsu-cho, Hashima-gun, Gifu Prefecture In stock company Malvan (72) Inventor Toshihiro Yasuda 3-7-3 Higashino-cho, Kasugai-shi, Aichi F-Term (Reference) 4D075 AE16 BB24Y BB24Z CA03 CA38 DA06 DB12 DC02 EA06 EA13 EB14 EB20 EB22 EB43 EB56 EC07 EC35 EC54 4J038 BA202 BA212 CB022 CB062 CG141 DL032 EA012 GA06 GA15 JA02 JA22 JA38 JA55 JB13 JB27 JC32 JC34 JC35 JC36 MA10 KA09 NA12 NA12 PA18 5G305 AA11 AB35 AB36 BA05 CA07 CD20 DA21 DA30

Claims (5)

[Claims] 1. An acrylic copolymer having an acrylic ester as a main component, and 100 parts by weight of this copolymer,
An aqueous emulsion paint type insulating composition, characterized by comprising 0.5 to 150 parts by weight of an insulating aid. 2. The acrylic copolymer has a carboxylic acid monomer component in an amount of 0.1 to 0.1 with respect to the total amount of the acrylic copolymer.
The paint-type insulating composition according to claim 1, which contains 5% by weight. 3. The acrylic copolymer has a silane compound component of 0.5 to 1 with respect to the total amount of the acrylic copolymer.
The paint-type insulating composition according to claim 1 or 2, which contains 0% by weight. 4. The insulating aid is at least one selected from the group consisting of waxes, silicon-based compounds, fluorine-based compounds, and surfactants, and any one of claims 1 to 3. Item 6. A paint-type insulating composition according to item. 5. A method of forming an insulating film on a surface of an object to be insulation-treated, first, an aqueous emulsion containing an acrylic copolymer containing acrylate as a main component.
(B) is applied and dried, and then an acrylic copolymer having an acrylic ester as a main component and the copolymer 10
A method for forming an insulating film, which comprises applying an aqueous emulsion paint type insulating composition (A) containing 0.5 to 150 parts by weight of an insulating aid to 0 part by weight and drying.