JP6754556B2 - Water-based paint for damping material - Google Patents

Description

The present invention relates to a compound for a vibration damping material, and more specifically, a compound for a vibration damping material that can be suitably used for various structures that require vibration damping properties, and a compound for a vibration damping material. Regarding the obtained coating film.

Vibration damping materials are used to prevent vibration and noise of various structures to maintain quietness, and are used under the floor of automobiles, as well as railroad vehicles, ships, aircraft, electrical equipment, and building structures. It is also widely used for things and construction equipment. Conventionally, as the damping material, a plate-shaped or sheet-shaped molded product made of a material having vibration absorbing performance and sound absorbing performance has been used, but as an alternative, vibration is formed by forming a coating film. Various paints capable of obtaining an absorption effect and a sound absorption effect have been proposed. As a coating material, one using an emulsion obtained by emulsion polymerization of a monomer component has been proposed (see, for example, Patent Documents 1 to 6). Further, an emulsion obtained by emulsion-polymerizing a monomer component using a reactive emulsifier has been proposed (see, for example, Patent Document 7).

Japanese Unexamined Patent Publication No. 2012-207103 International Publication No. 2007/023821 JP-A-2010-275547 Japanese Patent No. 4550703 Japanese Patent No. 5159628 Japanese Patent No. 5660779 Japanese Unexamined Patent Publication No. 2013-199531

As described above, various paints have been proposed, but a paint having an excellent appearance and capable of obtaining a coating film capable of exhibiting excellent vibration damping properties in a wide temperature range has not yet been found.

The present invention has been made in view of the above situation, and is a compound for a damping material having excellent mechanical stability, which can obtain a coating film having excellent appearance and exhibiting excellent damping properties in a wide temperature range. The purpose is to provide.

The present inventor has studied various materials having good mechanical stability, which can form a coating film capable of forming a coating film capable of achieving both appearance and excellent vibration damping properties in a wide temperature range, and found that all the singles used as raw materials for emulsions. We have come up with a new formulation for damping materials that contains 0.1 to 20% by mass of a component having a sulfosuccinic acid (salt) skeleton and 250 to 700% by mass of an inorganic filler with respect to 100% by mass of the body component. did. The present inventor can obtain a coating film in which this damping material formulation has excellent mechanical stability, and the formulation has an excellent appearance and can exhibit remarkably excellent damping properties in a wide temperature range. We have arrived at the present invention by finding out what we can do and thinking that we can solve the above problems brilliantly.

That is, the present invention contains an emulsion obtained by polymerizing a monomer component, a component having a sulfosuccinic acid (salt) skeleton, and an inorganic filler, and 100% by mass of all the monomer components used as a raw material of the emulsion. On the other hand, the content of the component having a sulfosuccinic acid (salt) skeleton is 0.1 to 20% by mass, and the content of the inorganic filler is 250 to 700% by mass. ..
The present invention will be described in detail below.
It should be noted that a combination of two or more of the individual preferred embodiments of the present invention described below is also a preferred embodiment of the present invention.

<Formulation for damping material of the present invention>
The compounding for a vibration damping material of the present invention contains an emulsion obtained by polymerizing a monomer component, and further, sulfosuccinic acid with respect to 100% by mass of all the monomer components used as a raw material of the emulsion. It contains 0.1 to 20% by mass of a component having a (salt) skeleton and 250 to 700% by mass of an inorganic filler.
The compound of the present invention containing a component having a sulfosuccinic acid (salt) skeleton means that the emulsion is obtained by emulsion polymerization, and the component is used as an emulsifier at the time of emulsion polymerization. The formulation may contain the component, or the formulation may contain the component added to an emulsion formed by emulsion polymerization using another emulsifying agent. By using a part of the component as an emulsifier and adding the rest of the component to the obtained emulsion, the formulation may contain the component and is polymerized by a method other than emulsion polymerization. The composition may contain the component by acting as an emulsifier on the polymer to form an emulsion. Above all, from the viewpoint of more fully exerting the effect of the present invention, the compound for the vibration damping material of the present invention is obtained by emulsion polymerization and uses the component as an emulsifier at the time of emulsion polymerization. Therefore, it is preferable that the formulation contains the component. When the component is used as an emulsifier at the time of emulsion polymerization, the component may be an ordinary emulsifier (a compound different from the polymer forming the emulsion) and constitutes a part of the polymer forming the emulsion. It may be a structural unit and an emulsifier. In the present specification, the component having a sulfosuccinic acid (salt) skeleton may be a compound having a sulfosuccinic acid (salt) skeleton, and the compound is a constituent unit of a polymer forming an emulsion. Although it may be used, it is more preferable that the compound has a sulfosuccinic acid (salt) skeleton. Further, a part of the component having a sulfosuccinic acid (salt) skeleton is a compound having a sulfosuccinic acid (salt) skeleton, and the rest of the component is a constituent unit of a polymer in which the compound forms an emulsion. It may be.

In the present specification, all the monomer components used as the raw materials of the emulsion are the monomer units constituting the polymer forming the emulsion in the compound for the vibration damping material of the present invention, and the emulsion. It means an oligomer and a monomer derived from a monomer used as a raw material of the above, but does not mean a component having a sulfosuccinic acid (salt) skeleton. The content of the component is the total amount of the compound having a sulfosuccinic acid (salt) skeleton and the structural units derived from the compound in the polymer forming the emulsion. In other words, the content of the component is the total amount of all compounds having a sulfosuccinic acid (salt) skeleton used in obtaining the damping material formulation of the present invention.
By using the compound for a damping material of the present invention, it is possible to suitably obtain a coating film having an excellent appearance and capable of exhibiting remarkably excellent damping properties in a wide temperature range.

The reason why a coating film having an excellent appearance can be obtained by using the compound for a damping material of the present invention is considered as follows. Conventionally, pigments such as calcium carbonate, thickeners, dispersants, and foaming agents such as heat-expanding capsule-type foaming agents have been mixed with the anti-vibration paint, and the water in the emulsion is removed by heating and drying (baking). The volatile components are evaporated, but if a certain amount of the foaming agent is not added, blisters occur in the coating film. This is because the volatile components evaporate from the surface of the coating film to form a dry film before all the volatile components evaporate from the inside of the coating film, so that the evaporation path of the volatile components inside the coating film is blocked and remains inside the coating film. It is considered that this is because the dry film is lifted by the vapor of the volatile component. The foaming agent thermally expands to form an evaporation path for volatile components, thereby facilitating the escape of vapors and preventing blister.
The compound for a vibration damping material of the present invention contains a specific amount of a component having a sulfosuccinic acid (salt) skeleton, so that even if the amount of the heat-expanding capsule-type foaming agent is reduced or eliminated, blistering is suppressed and the coating film has a good appearance. Can be obtained. This is good because the component having a sulfosuccinic acid (salt) skeleton has a foaming property, there is a fine foaming phenomenon due to boiling etc. from the initial stage of drying, and the drainage property is maintained even under continuous heating. It is presumed that a good coating film appearance can be obtained.
Further, since the compound having a sulfosuccinic acid (salt) skeleton is easily available and inexpensive, it is advantageous for preparing the compound for the damping material of the present invention.

In addition, in this specification, "the compound for the damping material" can be rephrased as "damping material". In other words, the present invention contains an emulsion obtained by polymerizing a monomer component, a component having a sulfosuccinic acid (salt) skeleton, and an inorganic filler, and the total monomer component 100 used as a raw material of the emulsion. It is also a damping material in which the content of the component having a sulfosuccinic acid (salt) skeleton is 0.1 to 20% by mass and the content of the inorganic filler is 250 to 700% by mass with respect to mass%.

(Component with sulfosuccinic acid (salt) skeleton)
The sulfosuccinic acid (salt) skeleton is a skeleton represented by -CO-C-C-COOR (R represents a hydrogen atom, an alkyl group, a metal salt, an ammonium salt, or an organic amine salt). A skeleton in which a sulfonic acid (salt) group is bonded to at least one of the carbon atoms of the −CC− portion.
The alkyl group in R is preferably an alkyl group having 1 to 20 carbon atoms, more preferably an alkyl group having 1 to 15 carbon atoms, and further preferably an alkyl group having 5 to 10 carbon atoms. For example, a 2-ethylhexyl group is particularly preferable. Examples of the metal atom forming the metal salt in R include monovalent metal atoms such as alkali metal atoms such as lithium, sodium and potassium; divalent metal atoms such as calcium and magnesium; and 3 such as aluminum and iron. Valuable metal atoms and the like can be mentioned. Examples of the organic amine salt in R include alkanolamine salts such as ethanolamine salt, diethanolamine salt and triethanolamine salt, and triethylamine salt and the like.
The R is preferably a hydrogen atom, an alkyl group, or a metal atom, more preferably an alkyl group or a metal atom, and further preferably a metal atom. As the metal atom, the monovalent metal atom is more preferable, and sodium is particularly preferable.

The sulfonic acid (salt) group means a sulfonic acid group and / or a sulfonic acid base. Examples of the sulfonic acid base include metal salts of sulfonic acid groups, ammonium salts, organic amine salts, and mixed salts thereof.
Examples of the metal atom forming the metal salt and the organic amine salt include the same as those described above.

The sulfonic acid (salt) group is more preferably a sulfonic acid group, a sodium sulfonate base, a magnesium sulfonate base, or a calcium sulfonate base, and a sodium sulfonate base, from the viewpoint of more fully exerting the function of the obtained coating film. , Magnesium sulfonate base, calcium sulfonate base is more preferable, and sodium sulfonate base is particularly preferable.

In the sulfosuccinic acid (salt) skeleton, a monovalent substituent other than a hydrogen atom and / or a hydrogen atom is further bonded. The component having a sulfosuccinic acid (salt) skeleton is a compound having a sulfosuccinic acid (salt) skeleton having a reactive carbon-carbon unsaturated bond, which is a constituent unit of the polymer in the emulsion at the time of polymerization. There may be. Examples of the compound having a sulfosuccinic acid (salt) skeleton having a reactive carbon-carbon unsaturated bond include Eleminor JS-20 (trade name, manufactured by Sanyo Kasei Co., Ltd.). However, the component having a sulfosuccinic acid (salt) skeleton is preferably a compound having no reactive carbon-carbon unsaturated bond from the viewpoint of improving the appearance of the coating film. When a compound having no reactive carbon-carbon unsaturated bond is used as a component having a sulfosuccinic acid (salt) skeleton, the compound for a vibration damping material of the present invention is a constituent unit of a polymer forming an emulsion. Separately, it will contain a compound having a sulfosuccinic acid (salt) skeleton. Thereby, the effect of the present invention for improving the appearance of the coating film can be more remarkably exhibited.

Examples of the substituent include a hydrocarbon group, an amino group, an alkoxy group, an alkylamino group, an alkoxysulfonyl group, a sulfoalkyl group, an aminoalkyl group, a carboxyl group, a polyalkylene oxide chain-containing group, an alkenyloxy group and the like. Be done. For example, the component having a sulfosuccinic acid (salt) skeleton preferably has a hydrocarbon group, more preferably has a hydrocarbon group having 8 or more carbon atoms, and preferably has a hydrocarbon group having 12 or more carbon atoms. More preferred.

It is also preferable that the component having a sulfosuccinic acid (salt) skeleton has a polyalkylene oxide chain-containing group. The polyalkylene oxide chain-containing group may be a group containing only a polyalkylene oxide chain or a group having a polyalkylene oxide chain and other structural sites. Examples of other structural parts include hydrocarbon groups such as aliphatic saturated hydrocarbon groups and aromatic hydrocarbon groups. As the polyalkylene oxide chain-containing group, it is preferable that a group containing only the polyalkylene oxide chain or a hydrogen atom or a hydrocarbon group is bonded to an oxygen atom at the end of the polyalkylene oxide chain. For example, the component having a sulfosuccinic acid (salt) skeleton has a polyalkylene oxide chain-containing group, and a hydrocarbon group having 8 or more carbon atoms is bonded to the end of the polyalkylene oxide chain-containing group. More preferably, a hydrocarbon group having 12 or more carbon atoms is bonded.

The component having a sulfosuccinic acid (salt) skeleton preferably has an average number of moles of oxyalkylene groups constituting the polyalkylene oxide chain of 3 or more, more preferably 4 or more, and 5 or more. Is even more preferable. The average number of moles added means the average number of moles of oxyalkylene groups added in 1 mole of the polyalkylene oxide chain in the component having a sulfosuccinic acid (salt) skeleton.

As described above, the component having a sulfosuccinic acid (salt) skeleton is preferably a compound having no reactive carbon-carbon unsaturated bond. The compound having a sulfosuccinic acid (salt) skeleton, which does not have the reactive carbon-carbon unsaturated bond, is, for example, the following general formula (1);

(In the formula, R ¹ represents a hydrogen atom or a monovalent alkyl group having 1 to 30 carbon atoms. -A- represents -O- or -NH-. R ² represents 1 to 1 carbon atoms. Represents 30 alkylene groups. The average number of moles of addition n is 0 to 200. X and Y represent the same or different hydrogen atoms or sulfonic acid (salt) groups. At least of X and Y. One represents a sulfonic acid (salt) group. R ³ represents a hydrogen atom, an alkyl group, a metal salt, an ammonium salt, or an organic amine salt).

The R ¹ preferably represents a monovalent alkyl group having 1 to 30 carbon atoms. The carbon number of R ¹ is preferably 4 or more, more preferably 8 or more, and further preferably 12 or more. Further, the carbon number of R ¹ is preferably 25 or less, and more preferably 20 or less.
The monovalent alkyl group is preferably a primary alkyl group or a secondary alkyl group.
From the viewpoint of improving vibration damping and mechanical stability in a well-balanced manner, the above-A-preferably represents -NH-.

The R ² is preferably mainly composed of an alkylene group having 2 to 4 carbon atoms such as an ethylene group, a propylene group and a butylene group, and more preferably an ethylene group.

The "subject" here means 50 to 100 mol% of the total number of R ² present when the (R ² O) _n site is composed of two or more types of oxyalkylene groups. Is preferable.
The (R 2 ^O) _n moiety, and is more preferably formed only from ethylene.

The average number of added moles n is 3 to 200, which is one of the preferable forms in the compound for damping material of the present invention. The average number of added moles n is more preferably 4 or more, and more preferably 5 or more, from the viewpoint of further enhancing the function of the compound having a sulfosuccinic acid (salt) skeleton as an emulsifier and improving the vibration damping property. More preferably, it is more preferably 6 or more, and particularly preferably 7 or more. Further, the average number of moles added n is more preferably 100 or less, further preferably 50 or less, further preferably 20 or less, and particularly preferably 10 or less.
Further, -A- represents -NH-, and the average number of added moles n is 0, which is also one of the preferable forms in the compound for damping material of the present invention. Thereby, the effect of the present invention can be remarkably exhibited.

The above X and Y represent the same or different hydrogen atom or sulfonic acid (salt) group. At least one of X and Y represents a sulfonic acid (salt) group. It is preferable that either X or Y represents a sulfonic acid (salt) group and the other represents a hydrogen atom. The preferred form of the sulfonic acid (salt) group is as described above.
The above R ³ represents a hydrogen atom, an alkyl group, a metal salt, an ammonium salt, or an organic amine salt. The R ³ is more preferably an alkyl group or a metal salt, and even more preferably a metal salt. Examples of the metal atom constituting the metal salt include alkali metal atoms such as lithium, sodium and potassium, and sodium is particularly preferable. The alkyl group represented by R ^3, an organic amine salt is similar to those described above.

The compound having a sulfosuccinic acid (salt) skeleton, which does not have the above-mentioned reactive carbon-carbon unsaturated bond, is, for example, the following general formula (2);

(Wherein, R ^1, -A-, average addition molar number n of the general formula (1) similar to those described above are in.) That is represented by the formulation for vibration damping materials of the present invention It is one of the preferred forms of goods.

The compound having a sulfosuccinic acid (salt) skeleton can be obtained, for example, by reacting sulfosuccinic acid with a compound having a substituent by using a conventionally known method. When the substituent is a polyalkylene oxide chain-containing group, for example, sulfosuccinic acid (salt) is produced by reacting a compound having an alkylene oxide such as ethylene oxide or a polyalkylene oxide chain with a carboxylic acid group of sulfosuccinic acid. A polyalkylene oxide chain-containing group can be introduced into the skeleton. Further, as the compound having a sulfosuccinic acid (salt) skeleton, a commercially available product or a commercially available product to which an aqueous solvent is added to appropriately adjust the solid content concentration can also be used.

In the anti-vibration material formulation of the present invention, the content of the component having a sulfosuccinic acid (salt) skeleton is 100% by mass of all the monomer components used as the raw material of the emulsion. From the viewpoint of improving the appearance of the coating film obtained by using the compound for use, it is preferably 0.5% by mass or more, more preferably 1% by mass or more, and 2% by mass or more. It is more preferable, and it is particularly preferable that it is 3% by mass or more. The content of the component having a sulfosuccinic acid (salt) skeleton is determined from the viewpoint of improving the mechanical stability of the compound for damping material of the present invention and the appearance of the coating film obtained by using the compound. It is preferably 15% by mass or less, more preferably 10% by mass or less, further preferably 8% by mass or less, and particularly preferably 6% by mass or less.

The compound for a vibration damping material of the present invention may contain an anionic surfactant other than the above-mentioned component having a sulfosuccinic acid (salt) skeleton, but in 100% by mass of the anionic surfactant in the compound. , The content of the component having a sulfosuccinic acid (salt) skeleton is preferably 30% by mass or more. The content is more preferably 50% by mass or more, further preferably 60% by mass or more, and the appearance and vibration damping properties of the coating film obtained by using the compound for damping material of the present invention can be improved. From the viewpoint of making it excellent, it is more preferably 70% by mass or more, further preferably 80% by mass or more, and particularly preferably 90% by mass or more.
The anionic surfactant in the above formulation means all of the agents contained in the formulation that can function as an anionic surfactant, regardless of the purpose of use thereof. That is, the anionic surfactant in the above-mentioned formulation may have other functions as long as it can function as an anionic surfactant. Examples of the purpose of use include an emulsifier (emulsifier for emulsion polymerization, etc.), a dispersant, a wet penetrant, a foaming agent, and the like.
When an anionic surfactant is used as an emulsifier for emulsion polymerization, the anionic surfactant may be an ordinary emulsifier (a compound different from the polymer forming the emulsion) and forms an emulsion. It is a structural unit that constitutes a part of the polymer and may be an emulsifier.
Further, the content of the component having a sulfosuccinic acid (salt) skeleton in the above-mentioned formulation for a vibration damping material of the present invention is obtained by summing up the amounts of all the compounds having a sulfosuccinic acid (salt) skeleton used as raw materials. , Which is a constituent unit of the polymer forming an emulsion can also be calculated. The content is a structural unit derived from the amount of the compound having a sulfosuccinic acid (salt) skeleton in the compound for a vibration damping material of the present invention and the compound having a sulfosuccinic acid (salt) skeleton in the polymer forming the emulsion. It can also be calculated by summing up the amounts of.
Further, the preferable content of the compound having a sulfosuccinic acid (salt) skeleton (a compound different from the polymer forming the emulsion) in the compound for the damping material of the present invention is the above-mentioned sulfosuccinic acid (salt) skeleton. It is also one of the preferable forms in the compound for the damping material of the present invention that it is within the range of the preferable content of the component to have. In this preferred embodiment, the composition of the polymer in which the component having a sulfosuccinic acid (salt) skeleton forms an emulsion separately from the compound having a sulfosuccinic acid (salt) skeleton in the compound for a vibration damping material of the present invention. It may be included as a unit.
The content of the compound having a sulfosuccinic acid (salt) skeleton in the formulation for a vibration damping material of the present invention can be determined by analyzing the components extracted from the coating film after heat drying by high performance liquid chromatography. Even when a compound having a sulfosuccinic acid (salt) skeleton having a reactive carbon-carbon unsaturated bond at the time of polymerization is used, those that are not a constituent unit of the polymer forming the emulsion should be analyzed. Is possible.

Examples of the anionic surfactant other than the component having a sulfosuccinic acid (salt) skeleton include those described in Japanese Patent No. 5030780 and Japanese Patent Application Laid-Open No. 2014-52024. Examples of the agent include polyoxyalkylene alkyl ether sulfates such as Revenol WX (trade name, sodium polyoxyethylene alkyl ether sulfate, manufactured by Kao Co., Ltd.); Neucol 707SF (trade name, polyoxyethylene polycyclic phenyl ether sulfate). Polyoxyalkylene polycyclic phenyl ether sulfate ester salt (ester salt, manufactured by Nippon Emulsifier Co., Ltd.); alkyldiphenyl ether disulfonate; reactive anionic emulsifier such as alkenyl succinate type anionic surfactant; other ordinary One or more of the anionic emulsifiers used (eg, sodium lauryl sulfate) and the like can be used.

The damping material formulation of the present invention may further contain an emulsifier other than the anionic surfactant. As the emulsifier other than the anionic surfactant, for example, the emulsifier described in JP-A-2014-52024 can be used.

(Inorganic filler)
The inorganic filler includes, for example, carbonates such as calcium carbonate and magnesium carbonate; sulfates such as barium sulfate; oxides such as titanium oxide, alumina, iron oxide, petals, metal oxide whiskers; and aluminum hydroxide. Hydroxides; silicates such as kaolin, silica, talc, mica, diatomaceous earth, clay; metal phosphates; metal molybdic salts; metal borates; carbon black; glass, etc. be able to. Among them, as the inorganic filler, carbonate and silicate are preferable, and calcium carbonate and mica are more preferable.
The inorganic filler preferably has an average particle size of 1 to 50 μm. The average particle size of the inorganic filler can be measured by a laser diffraction type particle size distribution measuring device, and is a value of 50% by weight from the particle size distribution.
The content of the inorganic filler in the damping material formulation of the present invention is 250 to 700% by mass with respect to 100% by mass of all the monomer components used as the raw material of the emulsion. By setting the content to 250% by mass or more, the appearance of the coating film obtained by using the compound for the damping material of the present invention can be improved. Further, by setting the content to 700% by mass or less, the mechanical stability of the damping material formulation of the present invention and the appearance of the coating film obtained by using the formulation can be improved. .. The content is more preferably 260% by mass or more, and further preferably 270% by mass or more. Further, the content is more preferably 600% by mass or less, further preferably 500% by mass or less, and particularly preferably 400% by mass or less.
The compound for a vibration damping material of the present invention can form an evaporation path of volatile components inside the coating film when the coating film is dried by using a component having a sulfosuccinic acid (salt) skeleton, and is obtained thereby. Although it is considered that the appearance of the coating film can be improved, it is considered that the interface between the polymer forming the emulsion and the inorganic filler also functions as an evaporation path of the volatile component. Therefore, by increasing or increasing the content of the inorganic filler to 250% by mass or more, the evaporation path of the volatile component is further increased, and the appearance of the obtained coating film is improved. It is considered to be.
Further, in the compound for damping material of the present invention, since the inorganic filler is dispersed in the emulsion, the content of the inorganic filler is reduced to 700% by mass or less to be inorganic in the emulsion. It is considered that the filler is uniformly dispersed and the mechanical stability of the vibration damping material formulation becomes better.
By setting the content of the inorganic filler as described above, the balance between the appearance of the obtained coating film and the mechanical stability of the damping material formulation can be improved.

(Emulsion made by polymerizing monomer components)
The compound for a damping material of the present invention contains an emulsion formed by polymerizing a monomer component. Above all, the compound for a vibration damping material of the present invention preferably contains an emulsion obtained by emulsion polymerization of a monomer component.
As the emulsion, various emulsions that can be miscible with the compound having a sulfosuccinic acid (salt) skeleton can be used, and for example, it is preferable to contain a polymer having a monomer unit having a carboxylic acid (salt) group. The carboxylic acid (salt) group means a carboxylic acid group and / or a carboxylic base.
The monomer unit salt having a carboxylic base is preferably a metal salt, an ammonium salt, an organic amine salt or the like. Examples of the metal atom forming the metal salt include a monovalent metal atom such as an alkali metal atom such as lithium, sodium and potassium; a divalent metal atom such as calcium and magnesium; and a trivalent metal such as aluminum and iron. Atoms are preferred. Further, as the organic amine salt, an alkanolamine salt such as an ethanolamine salt, a diethanolamine salt, or a triethanolamine salt, or a triethylamine salt is preferable.

The monomer unit having a carboxylic acid (salt) group is preferably a structural unit derived from a (meth) acrylic acid-based monomer. In other words, the emulsion preferably contains a (meth) acrylic polymer. The (meth) acrylic polymer refers to a polymer having a structural unit derived from a (meth) acrylic acid-based monomer, which will be described later.
For example, the monomer component for obtaining a (meth) acrylic polymer contains a (meth) acrylic acid-based monomer and other copolymerizable unsaturated monomers. Is preferable. By containing the (meth) acrylic acid-based monomer, the dispersibility of the inorganic pigment and the like is improved in the compound for the vibration damping material of the present invention, and the function of the obtained coating film is further improved. Further, by including other copolymerizable unsaturated monomers, it becomes easy to adjust the acid value, Tg, physical properties, etc. of the polymer.

The (meth) acrylic acid-based monomer has at least one group of an acryloyl group or a methacryloyl group, or a group in which a hydrogen atom in these groups is replaced with another atom or an atomic group, and the group thereof. It is a monomer having a carboxyl group (-COOH group) having a carbonyl group in the group or an acid anhydride group thereof (-C (= O) -OC (= O) -group). The (meth) acrylic acid-based monomer is preferably (meth) acrylic acid.

The (meth) acrylic polymer is composed of, for example, 0.1 to 5% by mass of the (meth) acrylic acid-based monomer and 95 to 99.9% by mass of other copolymerizable unsaturated monomers. It is preferably obtained by copolymerizing the constituent monomer components. Among the above monomer components, it is more preferable that the (meth) acrylic acid-based monomer is 0.3% by mass or more and the other copolymerizable unsaturated monomer is 99.7% by mass or less. It is more preferable that the amount of the meta) acrylic acid-based monomer is 0.5% by mass or more and the amount of other copolymerizable unsaturated monomer is 99.5% by mass or less, and the (meth) acrylic acid-based monomer is more preferable. Is particularly preferably 0.7% by mass or more, and the amount of other copolymerizable unsaturated monomers is 99.3% by mass or less. Further, in the above-mentioned monomer components, it is preferable that the (meth) acrylic acid-based monomer is 5% by mass or less and the other copolymerizable unsaturated monomer is 95% by mass or more, and (meth) acrylic. More preferably, the acid-based monomer is 4% by mass or less, the other copolymerizable unsaturated monomer is 96% by mass or more, the (meth) acrylic acid-based monomer is 3% by mass or less, and others. It is more preferable that the copolymerizable unsaturated monomer of the above is 97% by mass or more. Within such a range, the monomer components are stably copolymerized.

Other copolymerizable unsaturated monomers include (meth) acrylic monomers other than (meth) acrylic acid-based monomers, unsaturated monomers having an aromatic ring, and other copolymerizable unsaturated monomers. Examples include unsaturated monomers.
The (meth) acrylic monomer other than the above (meth) acrylic acid-based monomer has an acryloyl group or a methacryloyl group, or a group in which a hydrogen atom in these groups is replaced with another atom or an atomic group. However, it refers to a monomer in the form of an ester or a salt of a carboxyl group, or a derivative of such a monomer.

Examples of the (meth) acrylic monomer other than the above (meth) acrylic acid-based monomer include methyl acrylate, methyl methacrylate, ethyl acrylate, ethyl methacrylate, propyl acrylate, propyl methacrylate, isopropyl acrylate, isopropyl methacrylate, and butyl. Acrylate, butyl methacrylate, isobutyl acrylate, isobutyl methacrylate, tert-butyl acrylate, tert-butyl methacrylate, pentyl acrylate, pentyl methacrylate, isoamyl acrylate, isoamyl methacrylate, hexyl acrylate, hexyl methacrylate, cyclohexyl acrylate, cyclohexyl methacrylate, octyl acrylate, octyl methacrylate. , Isooctyl acrylate, Isooctyl methacrylate, Nonyl acrylate, Nonyl methacrylate, Isononyl acrylate, Isononyl methacrylate, Decyl acrylate, Decyl methacrylate, Dodecyl acrylate, Dodecyl methacrylate, Tridecyl acrylate, Tridecyl methacrylate, Hexadecyl acrylate, Hexadecyl methacrylate , Octadecyl acrylate, octadecyl methacrylate, 2-ethylhexyl acrylate, 2-ethylhexyl methacrylate, vinyl formate, vinyl acetate, vinyl propionate, 2-hydroxyethyl acrylate, 2-hydroxyethyl methacrylate, 2-hydroxypropyl acrylate, 2-hydroxypropyl methacrylate. , Dialyl phthalate, triallyl cyanurate, ethylene glycol diacrylate, ethylene glycol dimethacrylate, 1,4-butanediol diacrylate, 1,4-butanediol dimethacrylate, 1,6-hexanediol diacrylate, 1,6- Hexadiol dimethacrylate, diethylene glycol diacrylate, diethylene glycol dimethacrylate, allyl acrylate, allyl methacrylate, etc .; other (meth) acrylic acid-based monomer salts, esterified products, etc., one or two of these. It is preferable to use the above.

The salt of the (meth) acrylic acid-based monomer is preferably a metal salt, an ammonium salt, an organic amine salt or the like. As the metal salt and the organic amine salt, the same salts as those described above can be mentioned as the salt of the monomer unit having a carboxylic base.

As the monomer component used as a raw material for the (meth) acrylic polymer, a (meth) acrylic monomer other than the (meth) acrylic acid-based monomer was used as a raw material for an emulsion. It is preferably contained in an amount of 20% by mass or more, more preferably 40% by mass or more, and further preferably 60% by mass or more with respect to 100% by mass of the polymer component. Further, it is preferable that a (meth) acrylic monomer other than the above (meth) acrylic acid-based monomer is contained in an amount of 99.9% by mass or less based on 100% by mass of all the monomer components. It is more preferable to contain 5% by mass or less.

Examples of the unsaturated monomer having an aromatic ring include divinylbenzene, styrene, α-methylstyrene, vinyltoluene, ethylvinylbenzene and the like, and styrene is preferable.
That is, it is also one of the preferred embodiments of the present invention that the (meth) acrylic polymer is a styrene (meth) acrylic polymer obtained from a monomer component containing styrene. With such a form, the effect of the present invention can be fully exhibited while reducing the cost.

When the monomer component used as a raw material of the (meth) acrylic polymer contains an unsaturated monomer having an aromatic ring, it is based on 100% by mass of all the monomer components used as a raw material of the emulsion. It is preferably 1% by mass or more, more preferably 5% by mass or more, further preferably 10% by mass or more, further preferably 20% by mass or more, and particularly preferably 40% by mass or more. .. Further, the monomer component preferably contains the unsaturated monomer having an aromatic ring in an amount of 80% by mass or less, more preferably 70% by mass or less, based on 100% by mass of the total monomer component. It is preferable, and it is more preferable to contain 60% by mass or less. It is not necessary to use an unsaturated monomer having an aromatic ring as a monomer component that is a raw material of the (meth) acrylic polymer.

Examples of the other copolymerizable unsaturated monomer include polyfunctional unsaturated monomers such as acrylonitrile and trimethylolpropane diallyl ether.

The damping material formulation of the present invention preferably contains an aqueous solvent, and the emulsion is preferably dispersed in the aqueous solvent. In the present specification, the term "dispersed in an aqueous solvent" means that the solvent is dispersed in the aqueous solvent without being dissolved. In the present specification, the aqueous solvent may contain other organic solvents as long as it contains water, but water is preferable.

The compound for a vibration damping material of the present invention may contain one type of emulsion obtained by polymerizing a monomer component (hereinafter, also referred to as an emulsion according to the present invention), or may contain two or more types. .. When the compound for a vibration damping material of the present invention contains two or more kinds of emulsions according to the present invention, it may be a mixture obtained by mixing (blending) two or more kinds of emulsions according to the present invention, and is a series. An emulsion in which two or more types of polymer chains are compounded may be obtained by producing an emulsion containing two or more types of polymer chains in the production process (for example, multi-stage polymerization or the like). In order to obtain two or more kinds of emulsions according to the present invention in a series of manufacturing steps, manufacturing conditions such as monomer dropping conditions may be appropriately set. Examples of the composite of the two or more kinds of polymer chains include a form having a core portion and a shell portion, which will be described later. As a form in which the emulsion according to the present invention has a core portion and a shell portion, for example, the emulsion according to the present invention comprises two types of emulsions according to the present invention, and one of the two types of emulsions according to the present invention is used. Examples thereof include a core portion and the other forming a shell portion. The above-mentioned (meth) acrylic polymer is a polymer obtained by using a monomer component containing a (meth) acrylic acid-based monomer, for example, a (meth) acrylic acid-based monomer is used. , The monomer component forming the core portion of the emulsion and the monomer component forming the shell portion may be contained, or both of them may be contained.

Further, at least one of the emulsions according to the present invention forming an emulsion may be in the form of a composite of two or more polymer chains.

When the above emulsion is in the form of a composite of two or more kinds of polymer chains, one polymer chain and the other polymer chain are completely compatible with each other and have a homogeneous structure in which these cannot be distinguished. It is also possible that these are not completely incompatible and are formed inhomogeneously (for example, a core-shell composite structure or a microdomain structure), but among these structures, the characteristics of the emulsion In order to draw out sufficiently and prepare a stable emulsion, for example, a core-shell composite structure is preferable.
An emulsion having a core-shell composite structure has excellent vibration damping properties in a wide range within a practical temperature range. Especially in the high temperature range, it exhibits excellent vibration damping properties compared to other forms of damping material formulations, and as a result, it suppresses vibration over a wide range from normal temperature to high temperature range within the practical temperature range. It can demonstrate its performance.
In the core-shell composite structure, it is preferable that the surface of the core portion is covered with the shell portion. In this case, the surface of the core portion is preferably completely covered by the shell portion, but it does not have to be completely covered, for example, in a form of being covered in a mesh pattern or in some places, the core. It may be in a form in which the portion is exposed.

The emulsion according to the present invention preferably has a glass transition temperature of -30 to 50 ° C. When an emulsion having such a glass transition temperature is used as the emulsion according to the present invention, the vibration damping performance of the coating film in the practical temperature range can be effectively exhibited. The glass transition temperature of the emulsion according to the present invention is more preferably −20 ° C. or higher, further preferably −15 ° C. or higher, further preferably −10 ° C. or higher, and particularly preferably -4 ° C. or higher. .. The glass transition temperature is more preferably 40 ° C. or lower, further preferably 35 ° C. or lower, still more preferably 30 ° C. or lower, and particularly preferably 25 ° C. or lower. In the present specification, the glass transition temperature of an emulsion refers to the glass transition temperature of a polymer forming an emulsion.
The glass transition temperature (Tg) can be calculated by the method described in Examples described later. Further, when at least one of the emulsions according to the present invention is obtained by multi-stage polymerization (for example, when the emulsion particles have a core portion and a shell portion), the glass transition temperature is set to all stages. It means Tg (total Tg) calculated from the monomer composition used in.

When at least one of the emulsions according to the present invention is in the form of a composite of two or more polymer chains, the glass transition temperature of one of the polymer chains (for example, the polymer chain in the core portion) is 0 to 60. It is preferably ° C. More preferably, it is 10 to 50 ° C.
The glass transition temperature of the other polymer chain (for example, the polymer chain in the shell portion) is preferably -30 to 30 ° C. More preferably, it is -20 to 20 ° C.
The difference in glass transition temperature between one polymer chain and the other polymer chain is preferably 5 to 60 ° C. By providing a difference in the glass transition temperature in this way, for example, when applied to a vibration damping material application, it is possible to exhibit higher vibration damping properties in a wide temperature range, which is a particularly practical range 20. The vibration damping property in the range of ~ 60 ° C. will be further improved. The difference in glass transition temperature is more preferably 10 to 50 ° C, still more preferably 20 to 40 ° C.

The emulsion according to the present invention preferably has a weight average molecular weight of 20,000 to 800,000. In order to exert vibration damping properties, it is preferable to convert the energy of vibration applied to the polymer into thermal energy due to friction, and it is a polymer that can move when vibration is applied to the polymer. It is necessary to be. When the emulsion according to the present invention has such a weight average molecular weight, the polymer can sufficiently move when vibration is applied, and high vibration damping properties can be exhibited. The weight average molecular weight of the emulsion according to the present invention is more preferably 30,000 or more, still more preferably 50,000 or more. The weight average molecular weight of the emulsion according to the present invention is more preferably 500,000 or less, more preferably 500,000 or less, from the viewpoint of improving the appearance of the coating film obtained by using the compound for the damping material of the present invention. It is preferably 400,000 or less. In the present specification, the weight average molecular weight of an emulsion means the weight average molecular weight of the polymer forming the emulsion.
The weight average molecular weight (Mw) can be measured using GPC under the conditions described in Examples described later.

In the emulsion according to the present invention, the average particle size of the emulsion particles is preferably 80 to 450 nm.
By using emulsion particles having the above average particle size in this range, the basic performance such as the appearance of the coating film and the coatability required for the damping material is made sufficient, and the damping property is further improved. Can be. The average particle size of the emulsion particles is more preferably 400 nm or less, still more preferably 350 nm or less. The average particle size is preferably 100 nm or more.
The average particle size of the emulsion particles can be measured by the method described in Examples described later.

The solid content of the emulsion is preferably 40 to 80% by mass, more preferably 50 to 70% by mass with respect to the entire emulsion.
The solid content referred to here means a component other than a solvent such as an aqueous solvent contained in the emulsion.

The pH of the emulsion is not particularly limited, but is preferably 2 to 10, more preferably 3 to 9.5, and even more preferably 7 to 9. The pH of the emulsion can be adjusted by adding aqueous ammonia, water-soluble amines, an aqueous alkali hydroxide solution, or the like to the resin.
In the present specification, pH can be measured by the method described in Examples described later.

The viscosity of the emulsion is not particularly limited, but is preferably 1 to 10000 mPa · s, more preferably 10 to 8000 mPa · s, further preferably 20 to 6000 mPa · s, and 30 to 5000 mPa · s. It is more preferably s, and particularly preferably 80 to 3500 mPa · s.
In the present specification, the viscosity can be measured under the conditions described in Examples described later.

The method for producing the emulsion (polymer) is not particularly limited, and for example, it can be produced by the same method as the method for producing an emulsion for a vibration damping material described in JP-A-2011-231184. Further, the method for producing the emulsion is a method other than emulsion polymerization, for example, a component having a sulfosuccinic acid (salt) skeleton acts as an emulsifier on a polymer polymerized by suspension polymerization to form an emulsion. You may.

The solid content of the emulsion according to the present invention is preferably 10% by mass or more, more preferably 13% by mass or more, based on 100% by mass of the solid content of the compound for damping material of the present invention. It is more preferably 15% by mass or more, and particularly preferably 18% by mass or more. Further, the content is preferably 99% by mass or less, more preferably 97% by mass or less, further preferably 95% by mass or less, and particularly preferably 93% by mass or less. Most preferably, it is 91% by mass or less.
The solid content means a component other than a solvent such as an aqueous solvent.

The compound for a vibration damping material of the present invention may be an emulsion obtained by emulsion polymerization using a monomer emulsion containing all the compounds having a sulfosuccinic acid (salt) skeleton and a monomer component as a raw material. Emulsion polymerization was performed using a monomer emulsion containing a part of a compound having a sulfosuccinic acid (salt) skeleton and a monomer component as a raw material to obtain an emulsion, and then the sulfosuccinic acid (salt) was added to the obtained emulsion. It may be obtained by adding the rest of the compound having a skeleton. By emulsion polymerization using a monomer emulsion containing at least a part of a compound having a sulfosuccinic acid (salt) skeleton and a monomer component as a raw material in this way, at least the component having a sulfosuccinic acid (salt) skeleton is obtained. Part of it will be included as an emulsifier to form an emulsion. In this case, at least a part of the component having a sulfosuccinic acid (salt) skeleton may be an ordinary emulsifier (a compound separate from the polymer), and is a structural unit constituting a part of the polymer. And it may be an emulsifier.
The compound for a vibration damping material of the present invention is obtained by polymerizing (for example, emulsion polymerization) a monomer component containing no compound having a sulfosuccinic acid (salt) skeleton to obtain an emulsion, and then forming the obtained emulsion. On the other hand, it may be obtained by adding a compound having a sulfosuccinic acid (salt) skeleton.

The compound for a vibration damping material of the present invention contains other components as long as it contains a component having a sulfosuccinic acid (salt) skeleton according to the present invention, an inorganic filler and an emulsion obtained by polymerizing a monomer component. It may be.
When other components are contained, the ratio of the other components to the entire compound for the damping material of the present invention is preferably 10% by mass or less, more preferably 5% by mass or less. In addition, the other component referred to here means a non-volatile content (solid content) remaining in the coating film even after the compound for the damping material of the present invention is applied and heat-dried, and an aqueous solvent or the like is used. Contains no volatile components.

As described above, the compound for the damping material of the present invention preferably contains a solvent such as an aqueous solvent.
The content of the solvent may be appropriately set in order to adjust the solid content concentration of the compound for damping material of the present invention. For example, 3% by mass in 100% by mass of the compound for damping material of the present invention. % Or more, more preferably 10% by mass or more, further preferably 20% by mass or more, and particularly preferably 30% by mass or more. The content of the solvent is preferably 97% by mass or less, more preferably 90% by mass or less, and further preferably 80% by mass or less.

The solid content of the damping material formulation of the present invention is preferably 50% by mass or more, more preferably 60% by mass or more, and further preferably 70% by mass or more. The solid content of the damping material formulation is preferably 95% by mass or less, and more preferably 90% by mass or less.

The damping material formulation of the present invention may further contain a dispersant.
Examples of the dispersant include inorganic dispersants such as sodium hexametaphosphate and sodium tripolyphosphate, and organic dispersants such as polycarboxylic acid-based dispersants.
The amount of the dispersant to be blended is preferably 0.1 to 8 parts by mass, more preferably 0.5 to 6 parts by mass, based on 100 parts by mass of the solid content of the resin in the coating material of the present invention. ~ 3 parts by mass is more preferable.

The paint of the present invention may further contain a thickener.
Examples of the thickener include polyvinyl alcohol, cellulosic derivatives, polycarboxylic acid-based resins, and the like.
The amount of the thickener to be blended is preferably 0.01 to 5 parts by mass, more preferably 0.1 to 4 parts by mass, based on 100 parts by mass of the solid content of the resin in the coating material of the present invention. 0.3 to 2 parts by mass is more preferable.

The damping material formulation of the present invention may further contain other components. Other ingredients include, for example, foaming agents; organic colorants; gelling agents; defoaming agents; plasticizers; stabilizers; wetting agents; preservatives; foaming inhibitors; antiaging agents; fungicides; UV absorbers. Examples thereof include antistatic agents, and one or more of these can be used.
The dispersant, thickener, and other components are the polymer or sulfosuccinic acid that forms the emulsion according to the present invention, using, for example, a butterfly mixer, a planetary mixer, a spiral mixer, a kneader, a dissolver, or the like. It can be mixed with a component having a (salt) skeleton, an inorganic filler, or the like.

The damping material formulation of the present invention can be used to apply itself to form a damping coating film. A coating film is obtained by using the compound for a vibration damping material of the present invention, and particularly, by heating and drying the compound for a vibration damping material of the present invention to obtain a coating film, the compound for a vibration damping material is dried at the same time. By foaming the formulation, an evaporation path for a solvent such as water can be formed. As a result, blister of the coating film can be suppressed, and a coating film having a very good appearance can be obtained. Further, since the component having a sulfosuccinic acid (salt) skeleton functions as a foaming agent, it is possible to reduce the amount of an expensive foaming agent (for example, a heat-expanding capsule-type foaming agent) that has been conventionally used. For example, in the compound for damping material of the present invention, from the viewpoint of improving the appearance, the heat-expanding capsule-type foaming agent is used with respect to 100% by mass of all the monomer components used as the raw material of the emulsion. The content is preferably 2% by mass or less, more preferably 1% by mass or less, and most preferably 0% by mass.
Since the compound for a vibration damping material of the present invention contains a component having a sulfosuccinic acid (salt) skeleton that functions as a foaming agent, the content of the heat-expanding capsule-type foaming agent is set to 2% by mass or less or less. By doing so, it is possible to sufficiently prevent the foaming agent from becoming excessive and making it difficult to maintain the shape of the coating film, and it is possible to improve the appearance of the coating film.

<Coating film of the present invention and its manufacturing method>
The present invention is also a coating film obtained by using the compound for a damping material of the present invention. The coating film is preferably obtained by heating and drying the compound for a damping material of the present invention.
The preferred compound for the damping material used to obtain the coating film of the present invention is the same as the preferred compound for the damping material of the present invention described above.
The present invention is then used for the damping material by heating an emulsion formed by polymerizing a monomer component, a component having a sulfosuccinic acid (salt) skeleton, and a compound for a damping material containing an inorganic filler. It is also a coating film obtained by foaming a compound.
In the present invention, the damping material is formed by heating an emulsion obtained by polymerizing a monomer component, a component having a sulfosuccinic acid (salt) skeleton, and a compound for a damping material containing an inorganic filler. It is also a method of producing a coating film by foaming a compound for use.
Hereinafter, preferred forms of the coating film of the present invention will be described.

The coating film of the present invention preferably has a thickness of 2 to 8 mm. Such a thickness is preferable in consideration of exhibiting more sufficient vibration damping property, preventing peeling of the coating film, occurrence of cracks, and forming a good coating film. The thickness of the coating film is more preferably 2 to 6 mm, still more preferably 2 to 5 mm.

The base material for forming the coating film of the present invention is not particularly limited as long as the coating film can be formed, and may be any metal material such as a steel plate, a plastic material, or the like. Above all, forming a coating film on the surface of a steel sheet is one of the preferable usage forms of the vibration damping coating film of the present invention.

The coating film of the present invention can be obtained by applying the coating film of the present invention using, for example, a brush, a spatula, an air spray, an airless spray, a mortar gun, a ricing gun, or the like.

The coating film of the present invention is obtained by foaming the applied compound for vibration damping material of the present invention by heating and drying the compound. In addition, in order to foam the compound by heating and drying the compound for damping material, usually, the component having the sulfosuccinic acid (salt) skeleton is added by stirring the compound before heating and drying. Do not mechanically foam. In the heat drying, it is preferable to heat the coating film formed by applying the above-mentioned damping material formulation on the substrate to 40 to 200 ° C. The heating temperature is more preferably 90 to 180 ° C, still more preferably 100 to 160 ° C. Pre-drying may be performed at a lower temperature before heat-drying.
The time for heating the coating film to the above temperature is preferably 1 to 300 minutes. The heating time is more preferably 2 to 250 minutes, still more preferably 10 to 150 minutes.

The vibration damping property of the coating film of the present invention can be evaluated by measuring the loss coefficient of the film.
The loss factor is usually represented by η and indicates how much the vibration applied to the coating film is attenuated. The higher the value of the loss coefficient, the better the damping performance.
The loss factor can be measured by the method described in Examples described later.

The coating film of the present invention has an excellent appearance, can exhibit remarkably excellent vibration damping properties in a wide temperature range, and has excellent mechanical stability of the coating film for forming the coating film, and is excellent for automobiles, railroad vehicles, and ships. , Can be suitably used for transportation means such as aircraft, electrical equipment, building structures, construction equipment, and the like.

The compound for damping material of the present invention has excellent appearance and exhibits remarkably excellent damping property in a wide temperature range by using a predetermined amount of each of a component having a sulfosuccinic acid (salt) skeleton and an inorganic filler. It is possible to preferably obtain a possible coating film.

Hereinafter, the present invention will be described in more detail with reference to modes for carrying out the invention, but the present invention is not limited to the forms for carrying out these inventions. Unless otherwise specified, "part" means "part by weight" and "%" means "mass%".

In the following production examples, various physical properties and the like were evaluated as follows.
<Average particle size>
The average particle size of the emulsion particles was measured using a particle size distribution measuring device (FPAR-1000, Otsuka Electronics Co., Ltd.) by a dynamic light scattering method.
<Non-volatile content (NV)>
About 1 g of the obtained emulsion was weighed, and after 150 ° C. × 1 hour in a hot air dryer, the remaining amount of drying was defined as a non-volatile content, and the ratio to the mass before drying was displayed in mass%.
<pH>
The value at 25 ° C. was measured with a pH meter (“F-23” manufactured by HORIBA, Ltd.).
<Viscosity>
The measurement was performed using a B-type rotational viscometer (“VISCOMETER TUB-10” manufactured by Toki Sangyo Co., Ltd.) under the conditions of 25 ° C. and 20 rpm.

<Weight average molecular weight>
It was measured by GPC (gel permeation chromatography) under the following measurement conditions.
Measuring equipment: HLC-8120GPC (trade name, manufactured by Tosoh Corporation)
Molecular weight column: TSK-GEL GMHXL-L and TSK-GELG5000HXL (both manufactured by Tosoh Corporation) are connected in series and used. Eluent: tetrahydrofuran (THF)
Standard material for calibration curve: Polystyrene (manufactured by Tosoh)
Measurement method: The object to be measured is dissolved in THF so that the solid content is about 0.2% by mass, and the molecular weight is measured using the material filtered through a filter as a measurement sample.

<Glass transition temperature (Tg) of polymer>
The Tg of the polymer was calculated from the monomer composition used in each stage using the following calculation formula (1).

In the formula, Tg'is the Tg (absolute temperature) of the polymer. W ₁ ′, W ₂ ′, ... Wn ′ are mass fractions of each monomer with respect to all monomer components. T ₁ , T ₂ , ... Tn are the glass transition temperatures (absolute temperatures) of homopolymers (monopolymers) composed of each monomer component.

In addition, Tg calculated from the monomer composition used in all steps was described as "total Tg".
The Tg value of each homopolymer used to calculate the glass transition temperature (Tg) of the polymerizable monomer component by the above calculation formula (1) is shown below.
Methyl methacrylate (MMA): 105 ° C
Styrene (St): 100 ° C
2-Ethylhexyl acrylate (2EHA): -70 ° C
Butyl acrylate (BA): -56 ° C
Acrylic acid (AA): 95 ° C

Emulsifiers I to III used in the following examples will be described.
The emulsifier I is polyoxyethylene alkyl ether, sulfosuccinate, and disodium, and has the following formula (i):

It is a compound represented by. In the formula, the average number of added moles n is 8.

Emulsifier II is a polyoxyethylene alkyl ether sulfosuccinic acid semi-ester salt, and has the following formula (ii):

(In the formula, R represents a secondary alkyl group having 12 to 14 carbon atoms.) Is a compound represented by. In the formula, the average number of added moles n is 9.
Emulsifier III is N-alkylmonoamide disodium sulfosuccinate and has the following formula (iii):

(In the formula, R represents an alkyl group having 14 to 20 carbon atoms.) Is a compound represented by.

The emulsifier used in the comparative example will be described.
Newcol 707SF (trade name, polyoxyethylene polycyclic phenyl ether / sulfate ester salt: manufactured by Nippon Emulsifier Co., Ltd.)

<Examples 1 to 16, Comparative Examples 1 and 2>
(Example 1)
180.3 parts of deionized water was charged into a polymerizer equipped with a stirrer, a reflux condenser, a thermometer, a nitrogen introduction pipe, and a dropping funnel. Then, the internal temperature was raised to 75 ° C. while stirring under a nitrogen gas stream. On the other hand, 520 parts of methyl methacrylate, 130.0 parts of 2-ethylhexyl acrylate, 340 parts of butyl acrylate, 10.0 parts of acrylic acid, and t-dodecyl mercaptan (also referred to as t-DM) which is a polymerization chain transfer agent are added to the dropping funnel. A monomer emulsion consisting of 2.0 parts, 225.0 parts of a polyoxyethylene alkyl ether sulfosuccinic acid semi-ester salt (emulsifier II) prepared in advance in a 20% aqueous solution, and 217.0 parts of deionized water was charged. Next, while maintaining the internal temperature of the polymerizer at 75 ° C., 27.0 parts of the above-mentioned monomeric emulsion, 5 parts and 2% of a 5% potassium persulfite aqueous solution which is a polymerization initiator (oxidizing agent). 10 parts of an aqueous sodium hydrogen sulfite solution was added to initiate initial polymerization. After 40 minutes, the remaining monomeric emulsion was uniformly added dropwise over 210 minutes while maintaining the temperature in the reaction system at 80 ° C. At the same time, 95 parts of a 5% potassium persulfate aqueous solution and 90 parts of a 2% sodium hydrogen sulfite aqueous solution were uniformly added dropwise over 210 minutes, and the same temperature was maintained for 60 minutes after the completion of the addition to complete the polymerization.
After cooling the obtained reaction solution to room temperature, 16.7 parts of 2-dimethylethanolamine was added, the non-volatile content was 60.0%, the glass transition temperature was 4.0 ° C., the pH was 8.1, the viscosity was 2600 mPa · s, and the particle size. An acrylic emulsion (emulsion 1) having a weight average molecular weight of 100,000 and a particle size distribution of 230 nm was obtained.

(Example 2)
In the preparation of the monomeric emulsion of Example 1, the same operation as in Example 1 was carried out except that 520 parts of styrene was used instead of 520 parts of methyl methacrylate, and the non-volatile content was 59.9% and the glass transition temperature. An acrylic emulsion (emulsion 2) having a pH of 2.6 ° C., a viscosity of 3000 mPa · s, an average particle size of 210 nm, and a weight average molecular weight of 100,000 was obtained.

(Example 3)
In the preparation of the monomeric emulsion of Example 1, 520 parts of styrene was used instead of 520 parts of methyl methacrylate, and a polyoxyethylene alkyl ether sulfosuccinic acid semiester salt (emulsifier II) 225 was prepared in advance in a 20% aqueous solution. The same operation as in Example 1 was carried out except that 225.0 parts of polyoxyethylene alkyl ether sulfosuccinate disodium (emulsifier I) prepared in advance in a 20% aqueous solution was used instead of 0.0 part, and the non-volatile content was 60. An acrylic emulsion (emulsion 3) having 0.0%, a glass transition temperature of 2.6 ° C., a pH of 8.1, a viscosity of 2400 mPa · s, an average particle size of 260 nm, and a weight average molecular weight of 100,000 was obtained.

(Example 4)
In the preparation of the monomeric emulsion of Example 1, 290 parts of methyl methacrylate, 170.0 parts of styrene, 2-instead of 520 parts of methyl methacrylate, 130.0 parts of 2-ethylhexyl acrylate, and 340 parts of butyl acrylate. 225.0 to 100.0 parts of polyoxyethylene alkyl ether sulfosuccinic acid semi-ester salt (emulsion II) prepared in advance into a 20% aqueous solution using 170.0 parts of ethylhexyl acrylate and 360.0 parts of butyl acrylate. The same operation as in Example 1 was carried out except that it was changed to, and the non-volatile content was 60.0%, the glass transition temperature was -6.0 ° C., the pH was 8.1, the viscosity was 2000 mPa · s, the average particle size was 280 nm, and the weight average molecular weight was 100,000. Acrylate emulsion (emulsion 4) was obtained.

(Example 5)
In the preparation of the monomeric emulsion of Example 1, 485 parts of methyl methacrylate, 170 parts of styrene, and 2- instead of 520 parts of methyl methacrylate, 130.0 parts of 2-ethylhexyl acrylate, and 340 parts of butyl acrylate. Example 1 except that 335.0 parts of ethylhexyl acrylate was used and the polyoxyethylene alkyl ether sulfosuccinic acid semi-ester salt (emulsion II) prepared in advance in a 20% aqueous solution was changed from 225.0 parts to 100.0 parts. The same operation as above was carried out to obtain an acrylic emulsion (emulsion 5) having a non-volatile content of 60.2%, a glass transition temperature of 20.0 ° C., a pH of 8.2, a viscosity of 2200 mPa · s, an average particle size of 270 nm, and a weight average molecular weight of 100,000. It was.

(Example 6)
In the preparation of the monomeric emulsion of Example 1, the same operation as in Example 1 was carried out except that t-DM was changed from 2.0 parts to 5.0 parts, and the non-volatile content was 59.9%, glass. An acrylic emulsion (emulsion 6) having a transition temperature of 4.0 ° C., a pH of 8.0, a viscosity of 1800 mPa · s, an average particle size of 310 nm, and a weight average molecular weight of 50,000 was obtained.

(Example 7)
In the preparation of the monomeric emulsion of Example 1, 485 parts of methyl methacrylate, 170 parts of styrene, and 2- instead of 520 parts of methyl methacrylate, 130.0 parts of 2-ethylhexyl acrylate, and 340 parts of butyl acrylate. Using 335.0 parts of ethylhexyl acrylate, the same operation as in Example 1 was carried out except that t-DM was changed from 2.0 parts to 1.0 parts, and the non-volatile content was 60.1% and the glass transition temperature was 20. An acrylic emulsion (emulsion 7) having an average particle size of 210 nm and a weight average molecular weight of 400,000 was obtained at 0 ° C., pH 7.9, viscosity 3000 mPa · s.

(Example 8)
In the preparation of the monomeric emulsion of Example 1, sulfosuccinate prepared in advance in a 20% aqueous solution instead of 225.0 parts of a polyoxyethylene alkyl ether sulfosuccinic acid semiester salt (emulsifier II) prepared in advance in a 20% aqueous solution. The same operation as in Example 1 was carried out except that 225.0 parts of N-alkylmonoamide disodium acid (emulsifier III) was used, and the non-volatile content was 60.0%, the glass transition temperature was 4.0 ° C., and the pH was 8.2. An acrylic emulsion (emulsion 8) having a viscosity of 2600 mPa · s, an average particle size of 240 nm, and a weight average molecular weight of 100,000 was obtained.

(Example 9)
In the preparation of the monomeric emulsion of Example 1, poly prepared in advance in a 20% aqueous solution instead of 225.0 parts of a polyoxyethylene alkyl ether sulfosuccinic acid semiester salt (emulsifier II) prepared in advance in a 20% aqueous solution. Examples except that 100.0 parts of an oxyethylene alkyl ether sulfosuccinic acid semiester salt (emulsifier II) and 125.0 parts of N-alkylmonoamide disodium sulfosuccinate (emulsifier III) prepared in advance in a 20% aqueous solution were used. Perform the same operation as in No. 1 to obtain an acrylic emulsion (emulsion 9) having a non-volatile content of 60.0%, a glass transition temperature of 4.0 ° C., a pH of 8.0, a viscosity of 2400 mPa · s, an average particle size of 270 nm, and a weight average molecular weight of 100,000. Obtained.

(Example 10)
In the preparation of the monomeric emulsion of Example 1, sulfosuccinate prepared in advance in a 20% aqueous solution instead of 225.0 parts of a polyoxyethylene alkyl ether sulfosuccinic acid semiester salt (emulsifier II) prepared in advance in a 20% aqueous solution. The same operation as in Example 1 was carried out except that 225.0 parts of N-alkylmonoamide disodium acid (emulsifier III) was used, and the non-volatile content was 60.0%, the glass transition temperature was 4.0 ° C., and the pH was 8.1. An acrylic emulsion (emulsion 10) having a viscosity of 2300 mPa · s, an average particle size of 280 nm, and a weight average molecular weight of 100,000 was obtained.

(Example 11)
In the preparation of the monomeric emulsion of Example 1, 290 parts of methyl methacrylate, 170.0 parts of styrene, and 2- instead of 520 parts of methyl methacrylate, 130.0 parts of 2-ethylhexyl acrylate, and 340 parts of butyl acrylate. Using 170.0 parts of ethylhexyl acrylate and 360 parts of butyl acrylate, instead of 225.0 parts of polyoxyethylene alkyl ether sulfosuccinic acid semi-ester salt (emulsifier II) prepared in advance into a 20% aqueous solution, a 20% aqueous solution was prepared in advance. 190.0 parts of polyoxyethylene alkyl ether sulfosuccinate disodium (emulsifier I) adjusted to the above and Neucol 707SF (trade name, polyoxyethylene polycyclic phenyl ether sulfate ester salt) adjusted in advance to a 20% aqueous solution: Japanese emulsifier. The same operation as in Example 1 was carried out except that 100.0 parts (manufactured by Co., Ltd.) was used, and the non-volatile content was 60.1%, the glass transition temperature was −6.0 ° C., pH 8.2, viscosity was 2600 mPa · s, and average. An acrylic emulsion (emulsion 11) having a particle size of 220 nm and a weight average molecular weight of 100,000 was obtained.

(Example 12)
In the preparation of the monomeric emulsion of Example 1, 290 parts of methyl methacrylate, 170.0 parts of styrene, and 2- instead of 520 parts of methyl methacrylate, 130.0 parts of 2-ethylhexyl acrylate, and 340 parts of butyl acrylate. Using 170.0 parts of ethylhexyl acrylate and 360 parts of butyl acrylate, instead of 225.0 parts of polyoxyethylene alkyl ether sulfosuccinic acid semi-ester salt (emulsion II) prepared in advance into a 20% aqueous solution, a 20% aqueous solution was prepared in advance. It was obtained by the same polymerization production method as in Example 1 except that 100.0 parts of Newcol 707SF (trade name, polyoxyethylene polycyclic phenyl ether / sulfate ester salt: manufactured by Nippon Emulsion Co., Ltd.) adjusted to the above was used. 190.0 parts of N-alkylmonoamide disodium sulfosuccinate (emulsifier III) prepared in advance in a 20% aqueous solution was mixed with the emulsion, and the non-volatile content was 60.0%, the glass transition temperature was -6.0 ° C., and the pH was 8.2. An acrylic emulsion (emulsion 12) having a viscosity of 2100 mPa · s, an average particle size of 305 nm, and a weight average molecular weight of 100,000 was obtained.

(Example 13)
In the preparation of the monomeric emulsion of Example 1, sulfosuccinate prepared in advance in a 20% aqueous solution instead of 225.0 parts of a polyoxyethylene alkyl ether sulfosuccinic acid semiester salt (emulsifier II) prepared in advance in a 20% aqueous solution. The same operation as in Example 1 was carried out except that 225.0 parts of N-alkylmonoamide disodium acid (emulsifier III) was used, and the non-volatile content was 60.2%, the glass transition temperature was 4.0 ° C., and the pH was 8.1. An acrylic emulsion (emulsion 13) having a viscosity of 2400 mPa · s, an average particle size of 300 nm, and a weight average molecular weight of 100,000 was obtained.

(Example 14)
In the preparation of the monomeric emulsion of Example 1, the t-DM was changed from 2.0 parts to 5.0 parts, and the polyoxyethylene alkyl ether sulfosuccinic acid semi-ester salt (emulsifier) was prepared in advance in a 20% aqueous solution. II) 75.0 parts of N-alkylmonoamide disodium sulfosuccinate (emulsifier III) prepared in advance in a 20% aqueous solution instead of 225.0 parts and Neucol 707SF (trade name, polyoxyethylene) prepared in advance in a 20% aqueous solution. Polycyclic phenyl ether / sulfate ester salt: manufactured by Nippon Emulsifier Co., Ltd.) The same operation as in Example 1 was performed except that 150.0 parts were used, and the non-volatile content was 60.3%, the glass transition temperature was 4.0 ° C. An acrylic emulsion (emulsion 14) having a pH of 8.1, a viscosity of 3000 mPa · s, an average particle size of 210 nm, and a weight average molecular weight of 50,000 was obtained.

(Example 15)
In the preparation of the monomeric emulsion of Example 1, 290 parts of methyl methacrylate, 170.0 parts of styrene, 2-instead of 520 parts of methyl methacrylate, 130.0 parts of 2-ethylhexyl acrylate, and 340 parts of butyl acrylate. The same operation as in Example 1 was carried out except that 170.0 parts of ethylhexyl acrylate and 360 parts of butyl acrylate were used, and the non-volatile content was 60.0%, the glass transition temperature was -6.0 ° C., pH 8.0, and the viscosity. An acrylic emulsion (emulsion 15) having an average particle size of 220 nm and a weight average molecular weight of 100,000 was obtained at 2800 mPa · s.

(Example 16)
In the preparation of the monomeric emulsion of Example 1, 290 parts of methyl methacrylate, 170.0 parts of styrene, 2-instead of 520 parts of methyl methacrylate, 130.0 parts of 2-ethylhexyl acrylate, and 340 parts of butyl acrylate. The same operation as in Example 1 was carried out except that 170.0 parts of ethylhexyl acrylate and 360 parts of butyl acrylate were used, and the non-volatile content was 60.0%, the glass transition temperature was -6.0 ° C., pH 8.0, and the viscosity. An acrylic emulsion (emulsion 16) having an average particle size of 220 nm and a weight average molecular weight of 100,000 was obtained at 2800 mPa · s.

(Comparative Example 1)
In the preparation of the monomeric emulsion of Example 1, 290 parts of methyl methacrylate, 170.0 parts of styrene, 2-instead of 520 parts of methyl methacrylate, 130.0 parts of 2-ethylhexyl acrylate, and 340 parts of butyl acrylate. The same operation as in Example 1 was carried out except that 170.0 parts of ethylhexyl acrylate and 360 parts of butyl acrylate were used, and the non-volatile content was 60.0%, the glass transition temperature was -6.0 ° C., pH 8.0, and the viscosity. An acrylic emulsion (emulsion 17) having an average particle size of 220 nm and a weight average molecular weight of 100,000 was obtained at 2800 mPa · s.

(Comparative Example 2)
In the preparation of the monomeric emulsion of Example 1, a new 20% aqueous solution was prepared in advance instead of 225.0 parts of a polyoxyethylene alkyl ether sulfosuccinic acid semi-ester salt (emulsifier II) prepared in advance in a 20% aqueous solution. The same operation as in Example 1 was carried out except that 225.0 parts of Coal 707SF (trade name, polyoxyethylene polycyclic phenyl ether / sulfate ester salt: manufactured by Nippon Emulsifier Co., Ltd.) was used, and the non-volatile content was 60.1%. An acrylic emulsion (emulsion 18) having a glass transition temperature of 4.0 ° C., a pH of 8.1, a viscosity of 2500 mPa · s, an average particle size of 240 nm, and a weight average molecular weight of 100,000 was obtained.
In Comparative Example 2, a compound having a sulfosuccinic acid (salt) skeleton was not blended.

Subsequently, the emulsion obtained above was blended as follows, and mechanical stability, coating film disintegration resistance, and vibration damping property were evaluated as a compound for a damping material. The results are shown in Table 1.
-Polymer forming emulsions 1-18 Solid content 1000 parts-Calcium carbonate NN # 200 ^{* 1} Listed in Table 1-Dispersant Aquaric DL-40S ^{* 2} 30 parts-Thickener Acryset WR-650 ^{* 3} 20 parts, defoaming agent Nopco 8034L ^{* 4} 5 parts, foaming agent F-30 ^{* 5} Listed in Table 1 * 1: Filler manufactured by Nitto Flour Chemical Co., Ltd. * 2: Polycarboxylic acid type dispersant manufactured by Nippon Catalyst Co., Ltd. (Active ingredient 44%)
* 3: Alkali-soluble acrylic thickener manufactured by Nippon Shokubai Co., Ltd. (active ingredient 30%)
* 4: Antifoaming agent manufactured by San Nopco Co., Ltd. (main component: hydrophobic silicone + mineral oil)
* 5: Foaming agent manufactured by Matsumoto Yushi

Using the damping material formulations obtained in the above Examples and Comparative Examples, the appearance evaluation of the coating film, the vibration damping property test of the coating film, and the evaluation of the mechanical stability of the damping material formulation are as follows. It was carried out by the method. The results are shown in Table 1.

<Appearance evaluation of coating film>
The prepared compound for damping material was applied onto a steel plate (trade name: SPCC-SD, width 75 mm × length 150 mm × thickness 0.8 mm, manufactured by Nippon Test Panel Co., Ltd.) so that the coating thickness was 5 mm. Then, it was dried at 150 ° C. for 50 minutes using a hot air dryer, and the surface condition of the obtained dried coating film was evaluated according to the following criteria. In addition, foaming was generated from the paint by heating using a hot air dryer.
◯: No abnormality.
〇 △: Minor paint film blisters and cracks are seen in some places.
Δ: Blisters and cracks in the coating film are seen in some places.
X: Blisters are generated over the entire coating film, peeling, and cracks are observed.

<Damping property test>
The above compound for damping material is applied on a cold-rolled steel sheet (trade name SPCC, width 15 mm x length 250 mm x thickness 1.5 mm, manufactured by Nippon Test Panel Co., Ltd.) to a thickness of 3 mm and dried at 150 ° C. for 30 minutes. Then, a damping material coating having a surface density of 4.0 kg / m ² was formed on the cold-rolled steel sheet. In addition, foaming was generated from the paint by heating in drying. For vibration damping, the loss coefficient at each temperature (10 ° C, 20 ° C, 30 ° C, 40 ° C, 50 ° C, 60 ° C) was measured using the cantilever method (Loss coefficient measurement system manufactured by Ono Sokki Co., Ltd.). It was measured. The vibration damping property is evaluated by the total loss coefficient (sum of the loss factors at 10 ° C, 20 ° C, 30 ° C, 40 ° C, 50 ° C, and 60 ° C), and the larger the value of the total loss coefficient, the more the vibration damping. It has excellent properties.

<Evaluation of mechanical stability>
Take 150 g of the prepared anti-vibration compound in a 300 ml polypropylene cup, attach a blade with a diameter of 50 mm at a height of 5 mm from the bottom, stir at 1000 rpm using a dispar, and time until the paint gels. (Minute) was measured.

From the results of Examples 1 to 16, the emulsion for a vibration damping material containing an emulsion obtained by polymerizing a monomer component, a component having a sulfosuccinic acid (salt) skeleton, and an inorganic filler has mechanical stability. It can be seen that it is excellent, and the appearance and vibration damping property of the coating film obtained by using this are excellent.
For example, comparing Example 13 and Comparative Example 2 in which conditions other than the type of emulsifier charged in the polymerizer are common, in Example 13, emulsifier III (N-alkylmonoamide disodium sulfosuccinate) was used as the emulsifier. , It has been demonstrated that the vibration damping property, the mechanical stability, and the appearance are superior to those of Comparative Example 2, respectively. Further, Examples 15, 16 and Comparative Example 1 have the same conditions other than the amount of the inorganic filler used, but in Comparative Example 1, the amount of the inorganic filler used was used as the raw material for the emulsion. Since it is as low as 100% by mass with respect to 100% by mass of all the monomer components, the appearance and vibration damping properties are inferior to those of Examples 15 and 16.

Further, comparing Example 1 and Example 2 in which conditions other than the type of the monomer charged in the polymerizer are common, in Example 2, methyl methacrylate is used by using styrene as the monomer in Example 2. Compared with, the vibration damping property and the mechanical stability are more excellent.
Further, comparing Example 8, Example 10 and Example 13 in which conditions other than the amount of the conventional foaming agent added to the emulsion are common, the total monomer component used as the raw material of the emulsion is 100% by mass. On the other hand, compared to Example 10 in which the content of the heat-expanding capsule-type foaming agent is 1.5% by mass, Example 8 in which the heat-expansion capsule-type foaming agent is not used and the content of the heat-expansion capsule-type foaming agent Example 13 in which is 0.5% by mass is more excellent in vibration damping property, mechanical stability, and appearance. In the compound for damping material of the present invention, since the compound having a sulfosuccinic acid (salt) skeleton functions as a foaming agent, it is preferable to reduce or reduce the amount of the heat-expanding capsule-type foaming agent to be added. In Examples 8 and 13, the amount of the foaming agent in the damping material formulation is not excessive and is within an appropriate range, so that the shape of the coating film can be more sufficiently maintained, and the appearance of the coating film can be maintained. Can be set to "no abnormality".

Further, in Example 12, a compound having a sulfosuccinate skeleton is not used as an emulsifier for forming an emulsion, and the compound is added to the obtained emulsion after the completion of the polymerization step. It has been demonstrated that the appearance, mechanical stability, etc. are superior to those of the examples.

Comparing Example 6 and Example 8 in which conditions other than the type of emulsifier charged in the polymerizer are common, in Example 8, emulsifier III (N-alkylmonoamide disodium sulfosuccinate) was used as the emulsifier. It has been demonstrated that, as compared with Example 6 in which emulsifier II (polyoxyethylene alkyl ether sulfosuccinic acid semi-ester salt) is used as an emulsifier, the vibration damping properties and mechanical stability are further excellent, respectively. Further, comparing Example 2 and Example 3 in which conditions other than the type of emulsifier charged in the polymerizer are common, in Example 2 in which emulsifier II is used as the emulsifier, emulsifier I (polyoxyethylene alkyl) is used as the emulsifier. It has been demonstrated that the vibration damping property and the mechanical stability are superior to those of Example 1 using (ether, sulfosuccinate, and disodium).

As described above, when the Examples are compared with the Comparative Examples corresponding to the Examples, in the compounding material for the damping material of any of the Examples, the component having a sulfosuccinate skeleton is used as an emulsifier as a monomer component. Alternatively, by using a predetermined amount as an emulsifier after completion of polymerization of the monomer component and using a predetermined amount of an inorganic filler, a component having a sulfosuccinate skeleton or an inorganic filler is not used in a predetermined amount as compared with a comparative example. It has been demonstrated to have better vibration, mechanical stability, and appearance. It is considered that such an effect is similarly exhibited if a component having a sulfosuccinic acid (salt) skeleton having a similar chemical structure or a predetermined amount of an inorganic filler is used. Therefore, from the results of the above-mentioned examples, it can be said that the present invention can be applied in the entire technical scope of the present invention and in various forms disclosed in the present specification, and advantageous actions and effects can be exhibited.

Claims (8)

It contains an emulsion made by polymerizing a monomer component, a component having a sulfosuccinic acid (salt) skeleton, and an inorganic filler.
The component having a sulfosuccinic acid (salt) skeleton is a compound having no reactive carbon-carbon unsaturated bond, and has the following general formula (1);

(In the formula, R ¹ represents a hydrogen atom or a monovalent alkyl group having 1 to 20 carbon atoms. -A- represents -O- or -NH-. R ² represents ^{2 to 2} carbon atoms. Represents an alkylene group of 4. The average number of moles of addition n is 0 to 200. X and Y represent the same or different hydrogen atom or sulfonic acid (salt) group. At least of X and Y. One represents a sulfonic acid (salt) group; R ³ represents a hydrogen atom, an alkyl group, a metal salt, an ammonium salt, or an organic amine salt).
The content of the component having a sulfosuccinic acid (salt) skeleton is 0.1 to 20% by mass with respect to 100% by mass of all the monomer components used as the raw material of the emulsion, and the content of the inorganic filler is Is 250-700% by mass,
The emulsion has a weight average molecular weight of 20,000 to 800,000 and contains a (meth) acrylic polymer.
The (meth) acrylic polymer is composed of 0.1 to 5% by mass of the (meth) acrylic acid-based monomer and 95 to 99.9% by mass of other copolymerizable unsaturated monomers. A water-based coating material for vibration damping materials, which is obtained by copolymerizing a monomer component. The water-based coating material for a vibration damping material according to claim 1, wherein the emulsion has a glass transition temperature of -30 to 50 ° C. The water-based coating material for a vibration damping material according to claim 1 or 2, wherein the emulsion contains a polymer having a monomer unit having a carboxylic acid (salt) group. The water-based coating material for a vibration damping material according to any one of claims 1 to 3, wherein the component having a sulfosuccinic acid (salt) skeleton has a hydrocarbon group having 8 or more carbon atoms. The invention according to any one of claims 1 to 4, wherein the content of the component having a sulfosuccinic acid (salt) skeleton is 50% by mass or more in 100% by mass of the anionic surfactant in the water-based coating material. Water-based paint for vibration damping materials. The invention according to any one of claims 1 to 5, wherein the content of the heat-expanding capsule-type foaming agent is 2% by mass or less with respect to 100% by mass of all the monomer components used as the raw material of the emulsion. Water-based paint for damping materials. Claims 1 to 6, wherein the content of the component having a sulfosuccinic acid (salt) skeleton is 2% by mass or more with respect to 100% by mass of all the monomer components used as the raw material of the emulsion. Water-based paint for damping material described in any of them. A coating film obtained by using the water-based coating material for a vibration damping material according to any one of claims 1 to 7.