JP2010275547A - Emulsion composition for drying by heating, method for producing the same, and vibration-damping material composition - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an emulsion composition for drying by heating, which has a significantly high drying rate upon heating and excellent vibration-damping properties, and is suitably used for various kinds of applications such as a vibration-damping material and a chipping-resistant material; to provide a method for producing the same; and to provide a vibration-damping material composition containing the emulsion composition for drying by heating. <P>SOLUTION: The emulsion composition for drying by heating includes an emulsion obtained by polymerizing monomer components including an unsaturated carboxylic acid monomer and another copolymerizable unsaturated monomer. The emulsion composition for drying by heating further includes a drying accelerator which is composed of a nonionic surfactant having a cloud point of ≥90°C and/or an anionic surfactant containing no ethylene glycol chain. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

The present invention relates to an emulsion composition for heat drying, a production method thereof, and a vibration damping composition. More specifically, the present invention relates to an emulsion composition for heat drying used for forming a coating film exhibiting various functions on a substrate, a method for producing the emulsion composition, and a vibration damping composition including the same.

The composition for heating and drying is a material that is widely used industrially to form a coating film that exhibits various functions on a base material, but recently it is also suitable for use as a vibration damping material or a chipping resistant material. Is used. Damping materials are used to prevent vibration and noise in various structures and maintain silence. For example, in addition to the interior floor of automobiles, railway vehicles, ships, aircraft, electrical equipment, and building structures Widely used in construction equipment. As a material used for such a damping material, conventionally, a molded product such as a plate-shaped molded body or a sheet-shaped molded body made of a material having vibration absorption performance and sound absorption performance has been used. When the shape of the location where the sound is generated is complicated, it is difficult to apply these molded products to the location where the vibration is generated, so a method for improving workability and fully exhibiting the damping performance Various studies have been made. For example, an asphalt sheet containing an inorganic powder has been used under the floor of an automobile, etc., but it is necessary to heat-seal, so improvement in workability and the like is desired, and a composition that forms a vibration damping material And polymers have been studied.

Thus, as an alternative material for such molded products, coating-type damping materials (paints) have been developed. For example, a coating film formed by spraying or applying an arbitrary method to a corresponding portion. Thus, various vibration-damping paints that can obtain a vibration absorption effect and a sound absorption effect have been proposed. Specifically, for example, as a water-based vibration-damping paint with improved coating film hardness obtained by blending a synthetic resin powder with a color developing agent such as asphalt, rubber, synthetic resin, and the like suitable for indoor use in automobiles, Anti-vibration coatings in which activated carbon is dispersed as a filler in a resin emulsion have been developed. However, even with these conventional products, the vibration damping performance is still not at a sufficiently satisfactory level, and there is a need for a technique that can further exhibit the vibration damping performance.

The chipping-resistant material is intended to prevent damage to the automobile body, the underside of the vehicle body, the undercarriage parts, etc. due to stepping stones during traveling, etc., and is generally formed of a vinyl chloride sol composition or the like. ing. However, since a resin containing halogen such as chlorine causes generation of harmful gases during incineration, in recent years, a chipping material composition that replaces the vinyl chloride sol composition has been studied from the viewpoint of environmental protection measures.

As a conventional composition for heating and drying, for example, a composition for polymerizing a monomer mixture essentially containing an unsaturated carboxylic acid monomer and being neutralized with an amine having a boiling point of 80 ° C. or higher is used. An emulsion (see Patent Document 1), an emulsion having a glass transition temperature of 50 ° C. or less and an organic fine particle having an average particle size of 15 μm or less (see Patent Document 2) are disclosed. Has been.

JP 2003-227542 A (2nd, 3rd, 9th to 10th pages) JP 2004-277536 A (No. 2, pages 10 to 11)

As described above, various heat-drying compositions have been studied. In particular, the compositions of Patent Documents 1 and 2 are extremely useful for various applications such as vibration damping materials because they are excellent in heat-drying properties and vibration-damping properties. Is. Specifically, Patent Document 1 demonstrates the heat drying property that, when the emulsion is polymerized and then neutralized with a high boiling point amine, a smooth dry coating film without swelling and cracking is obtained along with vibration damping performance. In addition, in Patent Document 2, when an emulsion having a low glass transition temperature specified so as to easily form a film in heat drying and an organic fine particle having a small average particle size are combined, It is disclosed that the heat drying property that the occurrence of blistering at the time of heat drying is prevented together with the vibration damping performance is exhibited. As described above, Patent Documents 1 and 2 are technologies that are expected to prevent swelling and cracking of the surface of the dried coating film.
In recent years, like the compositions of Patent Documents 1 and 2, emulsion-type compositions are being frequently used in the paint field. The emulsion-type composition forms a coating film by evaporating water and fusing the emulsion particles (resin particles) by heat-drying after coating, so the time required for industrial heat-drying is important. There are many things. However, in Patent Documents 1 and 2, the drying time has not been studied, and there has been room for contrivance to make it possible to significantly shorten the heating and drying time.

The present invention has been made in view of the above-described situation, and the drying rate during heating is remarkably large, and is excellent in vibration damping properties, and is suitably applied to various uses such as vibration damping materials and chipping resistant materials. It is an object of the present invention to provide an emulsion composition and a method for producing the same, and a vibration damping composition containing such a heat-drying emulsion composition.

The inventors of the present invention examined various compositions for heat drying, and first focused on the superiority of water-based emulsions in terms of workability and the like. As such emulsions, unsaturated carboxylic acid monomers and other co-polymers were used. Using a polymerized monomer component containing a polymerizable unsaturated monomer and combining a drying accelerator composed of a specific surfactant, the volatilization rate of the aqueous medium during heating (scattering rate) That is, it has been found that the heating and drying rate is dramatically increased. Usually, when the emulsion is heated and dried to form a coating film, the aqueous medium is volatilized and the emulsion particles are fused to form a film, but when the specific surfactant of the present invention is interposed Since the fusion of particles on the surface of the coating film is delayed and the passage of the aqueous medium from the inside of the emulsion to the surface is secured, it is presumed that the volatilization rate of the aqueous medium from the emulsion increases. In addition, the emulsion composition for heating and drying can be suitably manufactured by a manufacturing method including a step of adding a drying accelerator to an emulsion obtained by polymerizing monomer components, and for such heating and drying. It has also been found that the vibration damping composition including the emulsion composition exhibits extremely excellent vibration damping properties, and is extremely useful as a vibration damping material for various structures. The present inventors have arrived at the present invention by conceiving what can be done. Such an emulsion composition for heat-drying can also be suitably applied to a chipping-resistant material because the drying speed (drying efficiency) is remarkably large.

That is, the present invention is an emulsion composition for heating and drying comprising an emulsion obtained by polymerizing a monomer component containing an unsaturated carboxylic acid monomer and another copolymerizable unsaturated monomer, The emulsion composition for drying contains a drying accelerator, and the drying accelerator is a nonionic surfactant having a cloud point of 90 ° C. or higher and / or an anionic surfactant containing no ethylene glycol chain. Emulsion composition.
This invention is also a damping material composition containing the said emulsion composition for heat drying.

The present invention further relates to a method for producing a heat-drying emulsion composition comprising an emulsion obtained by polymerizing a monomer component containing an unsaturated carboxylic acid monomer and another copolymerizable unsaturated monomer. The production method includes a step of adding a drying accelerator to an emulsion obtained by polymerizing the monomer component, and the drying accelerator includes a nonionic surfactant having a cloud point of 90 ° C. or higher and It is also a method for producing a heat-drying emulsion composition which is an anionic surfactant containing no ethylene glycol chain.
The present invention is described in detail below.

The emulsion composition for heat drying according to the present invention comprises an emulsion obtained by polymerizing a monomer component containing an unsaturated carboxylic acid monomer and another copolymerizable unsaturated monomer, and a heat drying agent (drying acceleration). Agent), and these are the main components. “Main component” means that the total amount of the emulsion and the heat drying agent is 50% by weight, preferably 70% by weight or more, more preferably 100% by weight of the emulsion composition for heat drying. Is 90% by mass or more, more preferably 100% by mass, that is, a form comprising the emulsion and the heat drying agent. In addition, each component can use 1 type (s) or 2 or more types, respectively.

In the above-mentioned emulsion composition for heat drying, the heat drying agent (drying accelerator) is a nonionic surfactant having a cloud point of 90 ° C. or higher, an anionic surfactant not containing an ethylene glycol chain, and a thermosensitive gel described later. At least one of the compounds contained in the agent. By including such a heating desiccant, the volatilization rate of the aqueous medium from the emulsion is remarkably increased, and the drying efficiency is dramatically improved.
Nonionic surfactants usually have the property that when heated, the hydrophilicity gradually decreases due to the detachment of water molecules bound in water and becomes insoluble in water at a certain temperature. The temperature is called cloud point (° C). When a nonionic surfactant having a cloud point of 90 ° C. or higher is used, in the initial stage of heating and drying, water exists from the inside of the emulsion to the surface in order to delay the fusion of the particles on the surface of the coating film. It is thought that the passage of the medium is secured, and when the heating temperature reaches the cloud point, water molecules are released at a stretch, so that the volatilization of the aqueous medium from the emulsion proceeds at a stretch. When the cloud point is less than 90 ° C., the heat drying rate of the emulsion composition is not sufficient, but this cannot sufficiently delay the fusion of the particles at the initial stage of heat drying, and only the surface portion is dried. This is thought to be because the volatilization of the aqueous medium from did not proceed.

An anionic surfactant that does not contain an ethylene glycol chain usually exists in the form of a solid (powder), so that no particles are fused and the passage of the aqueous medium from the inside of the emulsion to the surface is maintained. Furthermore, it is estimated that the volatilization rate of the aqueous medium is large. In general, in emulsion polymerization, an anionic surfactant containing an ethylene glycol chain is used as an emulsifier. However, such a surfactant cannot sufficiently increase the heating and drying rate of the emulsion composition. This is presumably because the surfactant containing an ethylene glycol chain usually exists in the form of a viscous body or a wax, so that particles are fused and a water passage cannot be secured.

Examples of the nonionic surfactant having a cloud point of 90 ° C. or higher include, for example, polyoxyethylene alkyl ether (eg, “Emulgen 120P”, “Emulgen 1118S”, etc., manufactured by Kao Corporation); polyoxyethylene alkyl aryl ether; sorbitan fat Polyoxyethylene sorbitan aliphatic ester; aliphatic monoglyceride such as monolaurate of glycerol; polyoxyethyleneoxypropylene copolymer; condensation product of ethylene oxide and aliphatic amine, amide or acid, etc. . Also, allyloxymethylalkoxyethylhydroxypolyoxyethylene (for example, “ADEKA rear soap ER-20” manufactured by ADEKA), polyoxyalkylene alkenyl ether (for example, “Latemul PD-420”, “Latemul PD-” manufactured by Kao Corporation) 430 "etc.) can also be used.
In addition, a cloud point can be measured as follows, for example.
<Cloud point identification method>
A nonionic surfactant with a concentration of 2% by mass is placed in a flask equipped with a thermometer and heated, and the temperature at which turbidity starts is defined as the cloud point (° C.).

Examples of the anionic surfactant not containing an ethylene glycol chain include alkyl sulfates such as alkenyl succinic acid di-salt; sodium dodecyl sulfate (for example, “Emar O” manufactured by Kao Corporation), potassium dodecyl sulfate, ammonium alkyl sulfate, and the like. Sodium dodecyl polyglycol ether sulfate; sodium sulforicinoate; alkylsulfonate such as sulfonated paraffin salt; sodium dodecylbenzenesulfonate (for example, “Neopelex G-65” manufactured by Kao Corporation), alkali phenol hydroxyethylene alkali Alkyl sulfonates such as metal sulfates; High alkyl naphthalene sulfonates; Naphthalene sulfonic acid formalin condensates; Sodium laurate, Trieta Lumpur amine oleate, fatty acid salts such as triethanolamine abietate, and the like.

The content of the drying accelerator is preferably 1 to 10 parts by weight with respect to 100 parts by weight of the solid content of the emulsion. If it exceeds 10 parts by weight, the effects such as vibration damping and heat drying properties due to the emulsion may not be sufficiently exhibited. If it is less than 1 part by weight, the heating drying speed will not be sufficient, and the drying efficiency will be insufficient. May not be improved. More preferably, it is 1-8 weight part, More preferably, it is 2-8 weight part.
The emulsion composition for heat drying of the present invention uses a surfactant corresponding to the drying accelerator as an emulsifier as an emulsifier for obtaining an emulsion, and the surfactant remains in the obtained emulsion. It may be in the form. That is, in the emulsion composition for heat drying of the present invention, not only those obtained by further adding a drying accelerator to the emulsion, but also using a surfactant corresponding to the drying accelerator as an emulsifier, Those in which the surfactant remains are also included, and further, these combined forms are also included. Therefore, when the surfactant corresponding to the above-mentioned drying accelerator is used as an emulsifier for obtaining an emulsion, the amount of the surfactant remaining in the obtained emulsion is confirmed and further added. It is preferable to adjust the amount.

The emulsion contained in the emulsion composition for heating and drying is composed of a polymer obtained by polymerizing a monomer component containing an unsaturated carboxylic acid monomer and another copolymerizable unsaturated monomer. And one or more of the polymers may be used. Such a polymer will usually be present in a dispersed form in the medium. That is, the emulsion is composed of a medium and a polymer dispersed in the medium.
The medium is preferably an aqueous medium, and examples thereof include water and a mixed solvent of water and a solvent mixed with water. Among these, in consideration of safety and environmental influence when applying the emulsion composition for heat drying of the present invention, it is preferable that water is 50% by mass or more in 100% by mass of the aqueous medium. More preferably, it is 70 mass% or more, More preferably, it is 100 mass%, ie, it is using water as a medium.

As a monomer component which forms the said emulsion, an unsaturated carboxylic acid monomer and the other unsaturated monomer copolymerizable with an unsaturated carboxylic acid monomer are essential. By making the unsaturated carboxylic acid monomer indispensable, for example, when the emulsion composition for heat drying is used for a damping material, the dispersibility of the filler such as inorganic powder is improved and the damping property is improved. In addition to being further improved, the inclusion of other copolymerizable unsaturated monomers makes it easier to adjust the acid value, glass transition point (Tg), physical properties, and the like of the emulsion. Further, due to the synergistic effect of the structural units formed from these monomers, for example, excellent heat drying properties and vibration damping properties can be exhibited sufficiently in an aqueous vibration damping material. Especially, 0.1-20 mol% of unsaturated carboxylic acid monomers and 80-99.9 mol% of other copolymerizable unsaturated monomers are contained with respect to the total amount of monomer components of 100 mol%. Is preferred. If the unsaturated carboxylic acid monomer is less than 0.1 mol% or more than 20 mol%, in any case, the emulsion may not be produced more stably. More preferably, the unsaturated carboxylic acid monomer is contained in an amount of 1 to 10 mol%, and other copolymerizable unsaturated monomers are contained in an amount of 90 to 99 mol%.

The unsaturated carboxylic acid monomer is not particularly limited as long as it is a compound having an unsaturated bond and a carboxyl group in the molecule. However, in order to further improve vibration damping properties, an ethylenically unsaturated carboxylic acid monomer is not limited. It is preferred to include a monomer. As the ethylenically unsaturated carboxylic acid monomer, for example, (meth) acrylic acid, crotonic acid, citraconic acid, itaconic acid, fumaric acid, maleic acid, maleic anhydride and the like, and salts thereof are suitable. These 1 type (s) or 2 or more types can be used. Among them, (meth) acrylic acid or a salt thereof (hereinafter also referred to as “(meth) acrylic acid monomer”) is preferable.
As the salt, metal salts, ammonium salts, organic amine salts and the like are suitable. Examples of the metal atom forming the metal salt include monovalent metal atoms such as alkali metal atoms such as lithium, sodium and potassium; divalent metal atoms such as alkaline earth metal atoms such as calcium and magnesium; aluminum, Trivalent metal atoms such as iron are suitable, and the organic amine salt is preferably an alkanolamine salt such as an ethanolamine salt, diethanolamine salt, or triethanolamine salt, or a triethylamine salt.

The other copolymerizable unsaturated monomer is not particularly limited as long as it is copolymerizable with the unsaturated carboxylic acid monomer. For example, other than the (meth) acrylic monomer Unsaturated monomers having a (meth) acryloyl group (hereinafter also referred to as “(meth) acrylic monomers”), unsaturated monomers having an aromatic ring, unsaturated monomers having a nitrogen atom Preferred examples include a polymerizable monomer having a glass transition temperature of 0 ° C. or less, an unsaturated monomer having a functional group, and the like, and using one or more of them. it can. Among these, it is preferable to use at least a (meth) acrylic monomer.

Examples of the (meth) acrylic monomer include methyl acrylate, methyl methacrylate, ethyl acrylate, ethyl methacrylate, propyl acrylate, propyl methacrylate, isopropyl acrylate, isopropyl methacrylate, 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, hydroxyethyl methacrylate, 2-hydroxypropyl acrylate, 2-hydroxypropyl methacrylate, diallyl phthalate, triallyl cyanurate, Ethylene glycol Diacrylate, ethylene glycol dimethacrylate, 1,4-butanediol diacrylate, 1,4-butanediol dimethacrylate, 1,6-hexanediol diacrylate, 1,6-hexanediol dimethacrylate, diethylene glycol diacrylate, diethylene glycol diacrylate In addition to methacrylate, allyl acrylate, allyl methacrylate, and the like, salts and esterified products thereof can be used.
In addition, as said salt, it is preferable that it is a form similar to the salt of the (meth) acrylic-acid type monomer mentioned above.

As described above, the monomer component may include an unsaturated monomer having a (meth) acryloyl group such as a (meth) acrylic acid monomer or a (meth) acrylic monomer. Is preferred. That is, at least one of the monomer components is C (R ¹ ₂ ) = CH—COOR ² or C (R ³ ₂ ) = C (CH ₃ ) —COOR ⁴ (R ¹ , R ² , R ³ and R ⁴ are the same or different and each represents a hydrogen atom, a metal atom, an ammonium group, or an organic amine group. Especially, it is preferable to make a (meth) acrylic acid-type monomer essential, and it is more preferable that both a (meth) acrylic-acid type monomer and a (meth) acrylic-type monomer are included. As described above, the monomer component contains a (meth) acrylic acid monomer ((meth) acrylic acid or a salt thereof) as an unsaturated carboxylic acid monomer, and other copolymerizable unsaturated monomers. A form containing a (meth) acrylic monomer as a body is one of the preferred forms of the present invention.
In addition, as content of the unsaturated monomer which has the (meth) acryloyl group in the said monomer component, ie, the above-mentioned (meth) acrylic-acid type monomer and (meth) acrylic-type monomer, Is preferably 20% by mass or more in 100% by mass of all monomer components. As a result, vibration damping is further improved. More preferably, it is 30 mass% or more.

Examples of the unsaturated monomer having an aromatic ring include divinylbenzene, styrene, α-methylstyrene, vinyltoluene, and ethylvinylbenzene. Of these, styrene is preferred.
As a ratio of the unsaturated monomer which has the said aromatic ring, it is suitable that it is 0-40 mass% in 100 mass% of all the monomer components. More preferably, it is 1-40 mass%, More preferably, it is 3-20 mass%.

Examples of the unsaturated monomer having a nitrogen atom include acrylonitrile, methacrylonitrile, acrylamide, methacrylamide, diacetone acrylamide, N-methylol acrylamide, N-methylol methacrylamide, N-methoxymethyl (meth) acrylamide, N-methoxyethyl (meth) acrylamide, Nn-butoxymethyl (meth) acrylamide, Ni-butoxymethyl (meth) acrylamide, etc. are mentioned.

By including a polymerizable monomer having a glass transition temperature of 0 ° C. or lower in the homopolymer (homopolymer), vibration damping properties in a wide temperature range are further improved. Although it is suitable to use 1 or more types of such polymerizable monomers, it is more preferable to use 2 or more types. Moreover, when obtaining the said emulsion by multistage polymerization, it is suitable that the monomer component used in each process contains 1 or more types of the said polymerizable monomer, respectively.
In addition, in this specification, the glass transition temperature of a homopolymer means the glass transition temperature of the hardened | cured material of a homopolymer.

In the unsaturated monomer having the functional group, the functional group may be any functional group that can be crosslinked when the emulsion is obtained by polymerization. By such an action of the functional group, the film-forming property and heat-drying property of the heat-drying emulsion composition are further improved. Specific examples include an epoxy group, an oxazoline group, a carbodiimide group, an aziridinyl group, an isocyanate group, a methylol group, a vinyl ether group, a cyclocarbonate group, an alkoxysilane group, and the like. You may have.

Examples of the unsaturated monomer having a functional group include divinylbenzene, ethylene glycol di (meth) acrylate, N-methoxymethyl (meth) acrylamide, N-methoxyethyl (meth) acrylamide, and Nn-butoxymethyl. (Meth) acrylamide, Ni-butoxymethyl (meth) acrylamide, N-methylol (meth) acrylamide, diallyl phthalate, diallyl terephthalate, polyethylene glycol di (meth) acrylate, propylene glycol di (meth) acrylate, polypropylene glycol di ( (Meth) acrylate, tetramethylene glycol di (meth) acrylate, polytetramethylene glycol di (meth) acrylate, 1,6-hexanediol di (meth) acrylate, neopentyl Polyfunctional unsaturated monomers such as Koruji (meth) acrylate; glycidyl (meth) acrylate, glycidyl group-containing unsaturated monomers such as acrylic glycidyl ether. Among these, it is preferable to use an unsaturated monomer (polyfunctional unsaturated monomer) having two or more functional groups.
The content of the unsaturated monomer having a functional group is preferably less than 10% by mass, more preferably 0.1 to 3% by mass with respect to 100% by mass of all monomer components. .

The emulsion preferably has a glass transition temperature (Tg) of -20 to 30 ° C. Thereby, it becomes possible to exhibit higher vibration damping properties under a wide temperature range. More preferably, it is -20-25 degreeC, More preferably, it is -15-20 degreeC. In addition, it is suitable that it becomes the range mentioned above as Tg (total Tg) computed from the monomer composition used at all the polymerization processes.
The Tg can be calculated from the following Fox equation (unit: K) using the glass transition temperature (Tgn) of the homopolymer (homopolymer) of each monomer constituting the emulsion.
1 / Tg = Σ (Wn / Tgn) / 100
(Wn represents the mass fraction (mass%) of monomer n with respect to all monomer components. Tgn is the glass transition temperature of the homopolymer comprising monomer n (unit: K, absolute temperature). )

Here, when the said emulsion contains 2 or more types of polymers, it is suitable to use what differs in Tg. That is, the emulsion is preferably composed of two or more polymers having different Tg. By providing a difference in Tg, it becomes possible to express a higher vibration damping property in a wide temperature range, and the vibration damping property in a practical range of 20 to 60 ° C. is particularly improved. Become.
When three or more types of polymers are included, it is sufficient that at least two of these polymers have different Tg, and the remaining one or more types have the same Tg as one of the two types of polymers. It may be.

The Tg of the two or more polymers is preferably −10 to 30 ° C. in the polymer having the highest Tg. Thereby, the drying property of the damping material coating film formed using the coating material containing the emulsion composition for heat drying of the present invention becomes better, and the expansion and cracks of the coating film surface are further sufficiently suppressed. It will be. That is, a vibration damping material having extremely excellent vibration damping properties is formed. More preferably, it is -5-20 degreeC, More preferably, it is 0-15 degreeC, Most preferably, it is 10 degrees C or less. Moreover, in the polymer with the lowest Tg, it is suitable that it is -50-10 degreeC, and it becomes possible to give the damping material which has the outstanding damping property by this. More preferably, it is −30 to 10 ° C.
The Tg difference between the polymer having the highest Tg and the polymer having the lowest Tg is preferably 10 to 60 ° C. If the difference is less than 10 ° C. or the temperature difference is too large, there is a possibility that the vibration damping performance in the practical range may not be sufficient. More preferably, it is 15-55 degreeC, More preferably, it is 20-50 degreeC.

The emulsion preferably has a weight average molecular weight of 20,000 to 400,000. When the weight average molecular weight is less than 20,000 or more than 400,000, the coating film surface state at the time of heat drying becomes poor, and as a result, good vibration damping properties are not exhibited. More preferably, it is 30,000-350,000, More preferably, it is 40,000-300,000.
The weight average molecular weight can be determined, for example, by GPC (gel permeation chromatography) measurement under the following measurement conditions.
Measuring instrument: 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. Eluent: Tetrahydrofuran (THF)
Standard material for calibration curve: Polystyrene (manufactured by Tosoh Corporation)
Measurement method: The measurement object is dissolved in THF so that the solid content is about 0.2% by mass, and the molecular weight is measured using an object obtained by filtration through a filter as a measurement sample.

The emulsion preferably has an average particle diameter of emulsion particles of 100 to 400 nm. By using emulsion particles having an average particle diameter in this range as a damping material, the basic performance required for the damping material can be made sufficient, and the damping performance can be further improved. .
The average particle size (volume average particle size) can be determined by, for example, diluting the emulsion with distilled water and thoroughly stirring and mixing, then collecting about 10 ml in a glass cell, and measuring the particle size distribution analyzer (Particle) by the dynamic light scattering method. It can be determined by measuring with “NICOMP Model 380” manufactured by Sizing Systems.

The emulsion particles having the above average particle diameter preferably have a particle size distribution defined by a value obtained by dividing the standard deviation by the volume average particle diameter (standard deviation / volume average particle diameter × 100) of 40% or less. When the particle size distribution exceeds 40%, the width of the particle size distribution of the emulsion particles becomes very wide and some of the particles contain coarse particles. Therefore, the emulsion composition for heat drying is affected by such coarse particles. There is a possibility that the product cannot exhibit sufficient heat drying properties. More preferably, it is 30% or less.

A particularly preferable form of the emulsion is a form having a glass transition point of -20 to 30 ° C. and a weight average molecular weight of 20,000 to 400,000. In such a form, the heat drying property (the surface state of the dried coating film) ), And the vibration damping performance is more fully exhibited, which makes it particularly suitable for use as a vibration damping material. Most preferably, the glass transition point is −20 to 30 ° C., the weight average molecular weight is 20,000 to 400,000, and the average particle diameter of the emulsion particles is 100 to 400 nm.

The emulsion may also be composed of two or more types of polymers as described above. In this case, the emulsion is not limited to a mixture in which two or more types of polymers are mixed. A case having a shell structure is also included. Especially, it is preferable that the particle | grains of the said emulsion are emulsion particles which have a core part and a shell part. Thereby, it will be excellent in the damping property in the wide range within a practical temperature range. Especially in the high temperature range, it exhibits excellent vibration damping performance compared to other forms of vibration damping composition. As a result, within the practical temperature range, the vibration damping performance covers a wide range from normal temperature to high temperature range. Can be demonstrated.
In the emulsion particles having a core part and a shell part, the unsaturated carboxylic acid monomer and other copolymerizable unsaturated monomers are the monomer component that forms the core part of the emulsion, and the shell part. It may be contained in any of the monomer components to be formed, or may be used for both of them.

In the emulsion particles having the core part and the shell part, the polymer forming the core part and the polymer forming the shell part are, for example, weight average molecular weight, glass transition temperature, SP value (solubility coefficient), use What is necessary is just to be different in any one of various physical properties such as the kind of monomer to be used and the use ratio of the monomer. Among them, it is preferable that there is a difference in at least one of the weight average molecular weight and the glass transition temperature.
For example, the difference in glass transition temperature (Tg) between the monomer component forming the core part and the monomer component forming the shell part is preferably 10 to 60 ° C. When the difference in Tg is less than 10 ° C. or greater than 60 ° C., there is a possibility that vibration damping properties cannot be obtained over a wide temperature range (20 ° C. to 60 ° C.). More preferably, the difference in Tg is 15 to 55 ° C, and further preferably 20 to 50 ° C. The Tg of the monomer component forming the core part is preferably higher than the Tg of the monomer component forming the shell part. That is, when an emulsion having a core part and a shell part is produced, it is produced by multistage polymerization in which the emulsion of the core part is formed and then the emulsion of the shell part is formed. The Tg of the monomer component is preferably higher than the Tg of the monomer component used in the subsequent step. Similarly, when the emulsion is produced in three or more steps, the Tg of the monomer component used in the subsequent step is lower than the Tg of the monomer component used in the immediately preceding step. Preferably there is.
The emulsion particles having the core part and the shell part can be obtained by using an emulsion polymerization method (multistage polymerization) described later.

In the form having the core part and the shell part, the core part and the shell part may be of a homogeneous structure in which the core part and the shell part are completely compatible with each other and cannot be distinguished from each other. It may be a homogeneously formed core / shell composite structure or microdomain structure. Among these, a core / shell composite structure is preferable in order to sufficiently draw out the characteristics of the emulsion and produce a stable emulsion.
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, it is preferable that the surface of the core part is completely covered with the shell part, but it may not be completely covered. For example, the core part may be covered in a mesh shape or in some places. The part may be exposed.

As a method for producing the emulsion, the monomer component is polymerized by an emulsion polymerization method in the presence of an emulsifier, but the form for carrying out the emulsion polymerization is not particularly limited. For example, an emulsifier and / or a protective colloid In the presence, the polymerization can be carried out by appropriately adding a monomer component and a polymerization initiator to the aqueous medium and polymerizing. Moreover, it is preferable to use a polymerization chain transfer agent or the like for molecular weight adjustment.
When the emulsion particles are emulsion particles having a core part and a shell part, the core part is formed by emulsion polymerization of monomer components in an aqueous medium in the presence of an emulsifier and / or a protective colloid. After that, it is preferable that the emulsion containing the core part is obtained by multi-stage polymerization in which a monomer component is further emulsion-polymerized to form a shell part.

Examples of the emulsifier include an anionic emulsifier, a cationic emulsifier, a nonionic emulsifier, an amphoteric emulsifier, and a polymer emulsifier, and one or more of these can be used.
The anionic emulsifier is not particularly limited. For example, polyoxyalkylene alkyl ether sulfate, polyoxyalkylene oleyl ether sodium sulfate, polyoxyalkylene alkylphenyl ether sulfate, alkyl diphenyl ether disulfonate, polyoxyalkylene (Mono, di, tri) styryl phenyl ether sulfate, polyoxyalkylene (mono, di, tri) benzyl phenyl ether sulfate, alkenyl succinate; sodium dodecyl sulfate, potassium dodecyl sulfate, ammonium alkyl sulfate, etc. Alkyl sulfate salt; sodium dodecyl polyglycol ether sulfate; sodium sulforicinoate; sulfonated paraffin Alkyl sulfonates such as sodium dodecyl benzene sulfonate, alkyl sulfonates such as alkali metal hydroxyethylene alkali metal sulfates; high alkyl naphthalene sulfonates; naphthalene sulfonic acid formalin condensates; sodium laurate, triethanolamine oleate, triethanolamine Fatty acid salts such as abietate; polyoxyalkyl ether sulfate ester; polyoxyethylene carboxylate sulfate ester salt; polyoxyethylene phenyl ether sulfate ester salt; succinic acid dialkyl ester sulfonate salt; polyoxyethylene alkylaryl sulfate salt Is mentioned.

Preferable specific examples of the anionic emulsifier include, for example, Latemle WX, Latemul 118B, Perex SS-H, Emulgen A-60, B-66, Emar O, Neoperex G-65, Lebenol WZ (manufactured by Kao Corporation), New Coal 707SF, New Coal 707SN, New Coal 714SF, New Coal 714SN (manufactured by Nippon Emulsifier Co., Ltd.), AB-26S, ABEX-2010, 2020, 2030, DSB (manufactured by Rhodia Nikka Co., Ltd.) and the like can be mentioned. In addition, emulsifiers corresponding to these nonionic types can also be used.

As the anionic emulsifier, as the reactive emulsifier, Latemul S-120, S-120A, S-180 and S-180A (all are trade names, manufactured by Kao Corporation), Eleminol JS-2 (trade names, Sanyo Kasei) ), Adekaria Soap SR-10, SR-20, SR-30 (ADEKA) and other sulfosuccinate type reactive anionic surfactants; Latemul ASK (trade name, manufactured by Kao Corporation) and other alkenyls 1 type (s) or 2 or more types, such as a succinate-type reactive anionic surfactant, can be used. Further, (meth) acrylic acid polyoxyethylene sulfonate salt (for example, “Eleminol RS-30” manufactured by Sanyo Chemical Industries, “Antox MS-60” manufactured by Nippon Emulsifier Co., Ltd.), allyloxymethylalkyloxypolyoxy Sulfate ester (salt) having an allyl group such as sulfonate salt of ethylene (for example, “Aqualon KH-10” manufactured by Daiichi Kogyo Seiyaku Co., Ltd.), ammonium polyoxyalkylene alkenyl ether sulfate (for example, “Latemul PD-” manufactured by Kao Corporation 104 "etc.) can also be used.

As the anionic emulsifier, a sulfoalkyl (carbon number 1 to 4) ester salt surfactant of an aliphatic unsaturated carboxylic acid having 3 to 5 carbon atoms can be used as a reactive emulsifier. Specific examples of such surfactants include (meth) acrylic acid sulfoalkyl ester salt type surfactants such as 2-sulfoethyl (meth) acrylate sodium salt and 3-sulfopropyl (meth) acrylate ammonium salt; Aliphatic unsaturated dicarboxylic acid alkylsulfoalkyl diester salt surfactants such as sulfopropylmaleic acid alkylester sodium salt, sulfopropylmaleic acid polyoxyethylene alkylester ammonium salt, sulfoethylfumaric acid polyoxyethylene alkylester ammonium salt, etc. Is mentioned.

The nonionic emulsifier is not particularly limited. For example, polyoxyethylene alkyl ether (for example, “Emulgen 120P”, “Emulgen 1118S”, “Emulgen 109P”, etc., manufactured by Kao Corporation); polyoxyethylene alkyl aryl ether; sorbitan fat Polyoxyethylene sorbitan aliphatic ester; aliphatic monoglyceride such as monolaurate of glycerol; polyoxyethyleneoxypropylene copolymer; condensation product of ethylene oxide and aliphatic amine, amide or acid, etc. . Also, allyloxymethylalkoxyethylhydroxypolyoxyethylene (for example, “ADEKA rear soap ER-20” manufactured by ADEKA), polyoxyalkylene alkenyl ether (for example, “Latemul PD-420”, “Latemul PD-” manufactured by Kao Corporation) Nonionic emulsifiers having reactivity such as “430” and the like can also be used. These can be used alone or in combination of two or more.
The cationic emulsifier is not particularly limited, and examples thereof include dialkyldimethylammonium salts, ester-type dialkylammonium salts, amide-type dialkylammonium salts, dialkylimidazolinium salts, and the like, and one or more of these are used. be able to.

The amphoteric emulsifier is not particularly limited, and examples thereof include alkyldimethylaminoacetic acid betaine, alkyldimethylamine oxide, alkylcarboxymethylhydroxyethyl imidazolinium betaine, alkylamidopropyl betaine, alkylhydroxysulfobetaine, and the like. Species or two or more can be used.
The polymer emulsifier is not particularly limited. For example, polyvinyl alcohol and modified products thereof; (meth) acrylic water-soluble polymer; hydroxyethyl (meth) acrylic water-soluble polymer; hydroxypropyl (meth) acrylic water solution Polymer; polyvinylpyrrolidone and the like can be mentioned, and one or more of these can be used.

Among the above-mentioned emulsifiers, it is preferable to use a non-nonylphenyl type emulsifier from the environmental viewpoint.
The amount of the emulsifier used may be appropriately set according to the type of emulsifier to be used, the type of monomer component, and the like. The amount is preferably 10 parts by weight, and more preferably 0.5 to 5 parts by weight. More preferably, it is 1 to 3 parts by weight.

Examples of the protective colloid include polyvinyl alcohols such as partially saponified polyvinyl alcohol, fully saponified polyvinyl alcohol, and modified polyvinyl alcohol; cellulose derivatives such as hydroxyethyl cellulose, hydroxypropyl cellulose, and carboxymethyl cellulose salt; natural polysaccharides such as guar gum Etc., and one or more of these can be used. The protective colloid may be used alone or in combination with a surfactant.
The use amount of the protective colloid may be appropriately set according to the use conditions and the like. For example, it is preferably 5 parts by weight or less, more preferably 100 parts by weight based on the total amount of the monomer components. Is 3 parts by weight or less.

The aqueous medium is not particularly limited. For example, water, one or two or more mixed solvents that can be mixed with water, and a mixed solvent in which water is a main component in such a solvent. Etc. Among these, it is preferable to use water. In addition, the usage-amount of an aqueous medium should just be set suitably in consideration of the desired resin solid content of the emulsion to be obtained.

The polymerization initiator is not particularly limited as long as it is a substance that decomposes by heat and generates radical molecules, but a water-soluble initiator is preferably used. For example, persulfates such as potassium persulfate, ammonium persulfate, and sodium persulfate; water-soluble such as 2,2'-azobis (2-amidinopropane) dihydrochloride, 4,4'-azobis (4-cyanopentanoic acid) Thermal decomposition initiators such as hydrogen peroxide; hydrogen peroxide and ascorbic acid, t-butyl hydroperoxide and Rongalite, potassium persulfate and metal salts, redox polymerization of ammonium persulfate and sodium bisulfite, etc. An agent etc. are mentioned, These 1 type (s) or 2 or more types can be used.
The amount of the polymerization initiator used is not particularly limited, and may be appropriately set according to the type of the polymerization initiator. For example, the amount of the polymerization initiator is 0.1 to 100 parts by weight based on the total amount of the monomer components. The amount is preferably 2 parts by weight, and more preferably 0.2 to 1 part by weight.

In order to promote emulsion polymerization, the polymerization initiator can be used in combination with a reducing agent as necessary. Examples of the reducing agent include reducing organic compounds such as ascorbic acid, tartaric acid, citric acid, and glucose; for example, reducing inorganic compounds such as sodium thiosulfate, sodium sulfite, sodium bisulfite, and sodium metabisulfite. These 1 type (s) or 2 or more types can be used.
It does not specifically limit as the usage-amount of the said reducing agent, For example, it is preferable that it is 0.05-1 weight part with respect to 100 weight part of total amounts of the said monomer component.

The polymerization chain transfer agent is not particularly limited. For example, alkyl mercaptans such as hexyl mercaptan, octyl mercaptan, n-dodecyl mercaptan, t-dodecyl mercaptan, n-hexadecyl mercaptan, n-tetradecyl mercaptan; carbon tetrachloride , Halogenated hydrocarbons such as carbon tetrabromide and ethylene bromide; mercaptocarboxylic acid alkyl esters such as mercaptoacetic acid 2-ethylhexyl ester, mercaptopropionic acid 2-ethylhexyl ester, mercaptopyropionic acid tridecyl ester; mercaptoacetic acid methoxybutyl Mercaptocarboxylic acid alkoxyalkyl ester such as ester, mercaptopropionic acid methoxybutyl ester; carboxylic acid mercaptoal such as octanoic acid 2-mercaptoethyl ester Glycol ester or, alpha-methylstyrene dimer, terpinolene, alpha-terpinene, .gamma.-terpinene, dipentene, anisole, allyl alcohol and the like. These may be used alone or in combination of two or more. Among these, alkyl mercaptans such as hexyl mercaptan, octyl mercaptan, n-dodecyl mercaptan, t-dodecyl mercaptan, n-hexadecyl mercaptan, and n-tetradecyl mercaptan are preferably used. The amount of the polymerization chain transfer agent used is usually 2 parts by weight or less, preferably 1 part by weight or less with respect to 100 parts by weight of the total amount of the monomer components.

The emulsion polymerization may be performed in the presence of a chelating agent such as sodium ethylenediaminetetraacetate, a dispersing agent such as sodium polyacrylate, an inorganic salt, or the like, if necessary. Moreover, as addition methods, such as a monomer component and a polymerization initiator, methods, such as a batch addition method, a continuous addition method, a multistage addition method, are applicable, for example. Moreover, you may combine these addition methods suitably.

Regarding the emulsion polymerization conditions in the above production method, the polymerization temperature is not particularly limited, and is preferably 0 to 100 ° C., and more preferably 40 to 95 ° C., for example. Also, the polymerization time is not particularly limited, and for example, it is preferably 1 to 15 hours, and more preferably 5 to 10 hours.
Moreover, it does not specifically limit as addition methods, such as a monomer component and a polymerization initiator, For example, methods, such as a batch addition method, a continuous addition method, a multistage addition method, are applicable. Moreover, you may combine these addition methods suitably.

In the said manufacturing method, after manufacturing emulsion by emulsion polymerization, you may neutralize an emulsion with a neutralizing agent as needed. Thereby, an emulsion is stabilized more. The neutralizing agent is not particularly limited, and for example, tertiary amines such as triethanolamine, dimethylethanolamine, diethylethanolamine and morpholine; ammonia water; sodium hydroxide and the like can be used. These may be used alone or in combination of two or more.

Although it does not specifically limit as a viscosity of the said emulsion, For example, it is preferable that it is 1-10000 mPa * s, More preferably, it is 5-300 mPa * s.
The viscosity can be measured using a B-type rotational viscometer under the conditions of 25 ° C. and 20 rpm.

In the present invention, after obtaining an emulsion obtained by polymerizing an unsaturated carboxylic acid monomer and a monomer component containing another copolymerizable unsaturated monomer as described above, It is preferable to add the dried accelerator, and thus it is preferable to produce the emulsion composition for heat drying according to the present invention. Thus, the manufacturing method of the emulsion composition for heat-drying including the process of adding a drying accelerator to the emulsion obtained by polymerizing the monomer component is also one aspect of the present invention.

In the said manufacturing method, what is necessary is just to set suitably the addition amount of a drying accelerator so that it may become 1-10 weight part with respect to 100 weight part of solid content of the said emulsion as mentioned above. In addition, when using a surfactant corresponding to the drying accelerator as an emulsifier at the time of emulsion polymerization for obtaining the emulsion, confirm the amount of the surfactant remaining in the obtained emulsion, Furthermore, it is preferable to adjust the amount of the drying accelerator to be added.
Moreover, in the said manufacturing method, it is preferable to include the process of fully mixing the said emulsion and heat-drying agent after the said addition process. The addition / mixing method is not particularly limited.

As described above, the emulsion composition for heat drying of the present invention contains a nonionic surfactant having a specific cloud point and / or an anionic surfactant not containing an ethylene glycol chain as a drying accelerator. is there. When the emulsion composition contains a nonionic surfactant having a specific cloud point, as described above, the nonionic surfactant is present between the emulsion particles from the inside of the emulsion to the surface at the initial stage of heating and drying. While the passage of the aqueous medium is ensured, when the heating temperature reaches the cloud point, water molecules are released at once, and the evaporation of the aqueous medium from the emulsion is promoted at a stretch.Therefore, the emulsion composition has excellent heat drying properties. Become. In addition, when such an emulsion composition is used, the shape stability of the dried coating film is improved, so that more excellent vibration damping properties can be realized.

Thus, when the emulsion composition for heat drying of the present invention contains a nonionic surfactant having a specific cloud point, it has a heat-sensitive gelling property that promotes gelation by heating, As a result, it is possible to achieve excellent heat drying properties, but the heat-sensitive gelling agent added to add heat-sensitive gelling properties to the emulsion composition is a nonionic interface as described above. The activator is not limited.

Examples of heat-sensitive gelling agents other than the above-mentioned nonionic surfactant having a specific cloud point include metal complexes such as ammonium carbonate zinc complex and ammonium sulfate zinc complex, zinc complexes obtained from zinc oxide and inorganic or organic ammonium salts, and calcium fluoride. Silyl fluoride such as sodium fluoride, potassium silicofluoride, nitroparaffin, organic esters, polyvinyl methyl ether, polypropylene glycol, polyether polyformal, polyether modified polysiloxane, alkylene oxide adduct of alkylphenol formalin condensate, functional polysiloxane Water-soluble modified silicone oil, silicone glycol copolymer, water-soluble polyamide, starch, methylcellulose, hydroxyethylcellulose, carboxymethylcellulose, protein, polyphosphoric acid, etc. Gerare, it can be used as a mixture of two or more thereof.
The use of two or more heat-sensitive gelling agents is a suitable method for facilitating the control of the gelation temperature, and nitroparaffins, organic esters, etc. are effective when used in combination with zinc oxide. It is.

The addition amount of the heat-sensitive gelling agent is preferably 1 to 10 parts by weight with respect to 100 parts by weight of the solid content of the emulsion. If it exceeds 10 parts by weight, the stability of the emulsion may be lowered, and if it is less than 1 part by weight, a sufficient heat-sensitive gelation effect cannot be obtained. More preferably, it is 1-8 weight part, More preferably, it is 2-8 weight part.

The gelation temperature of the thermosensitive gelling agent is preferably 10 to 98 ° C. If the temperature is lower than 10 ° C, the pot life and the storage stability after mixing the emulsion and the heat-sensitive gelling agent may not be sufficient. If the temperature is higher than 98 ° C, the rate of water splashing rather than gelation may be increased. There is a possibility that the uniformity of the film obtained using the emulsion may not be sufficient.
In addition, “thermal gelation” means that the progress of the gelation reaction is remarkably accelerated by heating above the gelation temperature, and does not mean that the gelation does not proceed at all at room temperature. .

The emulsion composition for heat drying of this invention can comprise a damping material composition and a chipping-resistant material composition with other components as needed. Such a damping material composition or anti-chipping material composition exhibits excellent heat drying properties, anti-vibration properties and anti-chipping properties, and can form an aqueous damping material or an anti-chipping material. Is. Among them, the vibration damping composition including the above-described emulsion composition for heat drying is also one aspect of the present invention, although it is particularly preferably used for the vibration damping material.
The vibration damping composition preferably includes at least the emulsion composition for heating and drying of the present invention, a pigment, a foaming agent, and a thickening agent. These components and other components included as necessary, for example, , A butterfly mixer, a planetary mixer, a spiral mixer, a kneader, a dissolver and the like.
The vibration damping composition preferably has a solid content of 70 to 90% by mass. The solid content means a solid content with respect to a total amount of 100% by mass of the vibration damping composition, but is more preferably 80 to 90% by mass as the solid content.

The pH of the vibration damping composition is preferably 7 to 11 at 25 ° C. More preferably, it is 7-9. This pH can also be measured in the same way as the pH of the emulsion composition for heat drying described above.

In the above damping material composition, the content of the emulsion composition for heat drying of the present invention is such that the solid content of the emulsion composition for heating and drying is 10 to 60 with respect to 100% by mass of the solid content of the damping material composition. It is preferable to set the mass%. More preferably, it is 15-55 mass%.

The vibration damping composition may also contain another emulsion resin together with the heat-drying emulsion composition of the present invention. Other emulsion resins include urethane resins, SBR resins, epoxy resins, vinyl acetate resins, vinyl chloride resins, vinyl chloride-ethylene resins, vinylidene chloride resins, styrene-butadiene resins, acrylonitrile-butadiene resins, etc. These emulsion resins can be used, and one or more of these can be used. In this case, the mass ratio of the emulsion composition for heat drying of the present invention to the other emulsion resin (the emulsion composition for heat drying of the present invention / other emulsion resin) is 100 to 50/0 to 50. Is preferred.

In the above damping material composition, examples of the pigment include a coloring agent such as an organic or inorganic coloring agent such as titanium oxide, carbon black, petal, Hansa yellow, benzine yellow, phthalocyanine blue, or quinacridone red; metal phosphate Examples thereof include rust preventive pigments such as salts, metal molybdates, and metal borates, and one or more of these can be used.
The blending amount of the pigment is preferably 50 to 700 parts by weight with respect to 100 parts by weight of the solid content of the emulsion composition for heat drying. More preferably, it is 100-550 weight part.

As the foaming agent, for example, a low-boiling hydrocarbon encapsulated heated expansion capsule, an organic foaming agent, an inorganic foaming agent, and the like are suitable, and one or more of these can be used. Examples of the heat-expandable capsule include Matsumoto Microsphere F-30, F-50 (manufactured by Matsumoto Yushi Co., Ltd.); EXPANSELL WU642, WU551, WU461, DU551, DU401 (manufactured by Nippon Expandcel). Examples of the organic foaming agent include azodicarbonamide, azobisisobutyronitrile, N, N-dinitrosopentamethylenetetramine, p-toluenesulfonylhydrazine, p-oxybis (benzenesulfohydrazide), and the like. Examples of the foaming agent include sodium bicarbonate, ammonium carbonate, silicon hydride and the like.
The blending amount of the foaming agent is preferably 0.5 to 5 parts by weight with respect to 100 parts by weight of the solid content of the heat-drying emulsion composition. More preferably, it is 1 to 3 parts by weight.

Examples of the thickener include polyvinyl alcohol, cellulose derivatives, polycarboxylic acid resins, and the like.
The blending amount of the thickener is preferably 0.01 to 2 parts by weight with respect to 100 parts by weight of the solid content of the emulsion composition for heat drying. More preferably, it is 0.05-1.5 weight part, More preferably, it is 0.1-1 weight part.

The above damping material composition also includes a solvent, an aqueous cross-linking agent, a plasticizer, a stabilizer, a wetting agent, an antiseptic agent, an antifoaming agent, a filler, a dispersant, an antifoaming agent, an antiaging agent, an antifungal agent, and an ultraviolet ray. Absorbent: In addition to additives such as antistatic agents, polyvalent metal compounds may be included. Each of these components can be used alone or in combination of two or more.

Examples of the solvent include ethylene glycol, butyl cellosolve, butyl carbitol, butyl carbitol acetate, and the like. What is necessary is just to set suitably as a compounding quantity of a solvent so that the solid content concentration of the emulsion composition for heat-drying in a damping material composition may become the range mentioned above.

Examples of the aqueous crosslinking agent include oxazoline compounds such as Epocross WS-500, WS-700, K-2010, 2020, 2030 (all trade names, manufactured by Nippon Shokubai Co., Ltd.); Adeka Resin EMN-26-60, EM- Epoxy compounds such as 101-50 (both trade names, manufactured by ADEKA); Melamine compounds such as Cymel C-325 (trade names, manufactured by Mitsui Cytec); Block isocyanate compounds; AZO-50 (trade names, 50 Zinc oxide compounds such as a mass% zinc oxide aqueous dispersion (manufactured by Nippon Shokubai Co., Ltd.) are suitable. The blending amount of the water-based crosslinking agent is preferably 0.01 to 20 parts by weight in solid content with respect to 100 parts by weight of solid content in the emulsion composition for heat drying, for example. More preferably 0.15 to 15 parts by weight, still more preferably 0.5 to 15 parts by weight, which may be added to the heat-drying emulsion composition, or when other components are blended as a vibration damping composition May be added simultaneously.
By mixing a crosslinking agent with the emulsion composition for heat drying or the vibration damping composition, the toughness of the resin is improved, and as a result, a sufficiently high vibration damping property is exhibited in a high temperature region. Among them, it is preferable to use an oxazoline compound.

Examples of the filler include inorganic fillers such as calcium carbonate, kaolin, silica, talc, barium sulfate, alumina, iron oxide, titanium oxide, glass talk, magnesium carbonate, aluminum hydroxide, talc, diatomaceous earth, and clay; Examples of the inorganic filler include glass flakes and mica; and fibrous inorganic fillers such as metal oxide whiskers and glass fibers. The blending amount of the filler is preferably 50 to 700 parts by weight with respect to 100 parts by weight of the solid content of the emulsion composition for heat drying. More preferably, it is 100-550 weight part.
Examples of the dispersant include inorganic dispersants such as sodium hexametaphosphate and sodium tripolyphosphate, and organic dispersants such as polycarboxylic acid-based dispersants.
Examples of the antifoaming agent include silicon-based antifoaming agents.

The damping material composition may further contain a polyvalent metal compound. In this case, the polyvalent metal compound improves the stability, dispersibility, heat drying property, and damping properties of the damping material formed from the damping material composition. It does not specifically limit as a polyvalent metal compound, For example, zinc oxide, zinc chloride, zinc sulfate etc. are mentioned, These 1 type (s) or 2 or more types can be used. The form of the polyvalent metal compound may be, for example, a powder, an aqueous dispersion, an emulsion dispersion, or the like. Especially, since the dispersibility in a damping material composition improves, it is preferable to use with the form of an aqueous dispersion or an emulsion dispersion, More preferably, it is used with the form of an emulsion dispersion. Moreover, it is preferable that the usage-amount of a polyvalent metal compound shall be 0.05-5.0 weight part with respect to 100 weight part of solid content of the said emulsion composition for heat drying. More preferably, it is 0.05-3.5 weight part.

For example, the vibration damping composition is applied to a substrate and dried to form a coating film to be a vibration damping material. The substrate is not particularly limited. Moreover, as a method of applying the vibration damping composition to the substrate, for example, it can be applied using a brush, a spatula, an air spray, an airless spray, a mortar gun, a ricin gun or the like.
The coating amount of the damping material composition may be appropriately set depending on the application, desired performance, etc., but it is preferable that the film thickness of the coating film during drying is 0.5 to 8.0 mm. . More preferably, it is 3.0-6.0 mm.
Moreover, it is also preferable to apply so that the surface density of the coating film at the time of drying (after) is 1.0 to 7.0 kg / m ² . More preferably, it is 2.0-6.0 kg / m < ² >. By using the vibration damping composition of the present invention, it is possible to obtain a coating film that hardly undergoes expansion or cracking during drying and that hardly causes the paint on the inclined surface to slide off.
Thus, the coating method of the damping material composition applied so that the film thickness of the coating film when dried is 0.5 to 8.0 mm, and the surface density of the coating film after drying. A method of applying a vibration damping composition that is applied so that the viscosity is 2.0 to 6.0 kg / m ² and dried is also one of the preferred embodiments of the present invention. Moreover, the damping material obtained by the coating method of the damping material composition is also one of the preferred embodiments of the present invention.

The conditions for applying the damping material composition and then drying to form a coating film may be heat drying or room temperature drying, but the damping material composition in the present invention is heat drying. From the viewpoint of efficiency, it is preferable to heat and dry. The heat drying temperature is preferably 80 to 210 ° C. More preferably, it is 110-180 degreeC, More preferably, it is 120-170 degreeC.

The emulsion composition for heating and drying according to the present invention has the above-described configuration, so that the drying rate at the time of heating is remarkably large, and the vibration damping property is excellent. It is a thing. The vibration damping composition containing such an emulsion composition for heat drying is suitable for industrial applications such as railway vehicles, ships, aircraft, electrical equipment, building structures, construction equipment, in addition to the interior floors of automobiles. Applicable. Since the emulsion composition for heat drying of the present invention can also exhibit excellent heat drying properties, it can also be suitably applied to automobile exteriors, automobile parts, home appliances, machines, etc. as a chipping material composition.

The present invention will be described in more detail with reference to the following examples. However, the present invention is not limited to these examples. Unless otherwise specified, “part” means “part by weight” and “%” means “mass%”.

In the following production examples, the pH, viscosity, average particle size, particle size distribution, and weight average molecular weight were determined by the above-described methods, but other physical properties were evaluated as follows.
<Glass transition temperature (Tg)>
It calculated using the formula of Fox mentioned above from the monomer composition used at each stage. In addition, Tg calculated from the monomer composition used in all stages was described as “total Tg”.
The Tg value of each homopolymer used to calculate the glass transition temperature (Tg) of the polymerizable monomer component according to the Fox equation is shown below.
Methyl methacrylate (MMA): 105 ° C
Styrene: 100 ° C
Butyl acrylate (BA): -56 ° C
2-ethylhexyl acrylate (2EHA): -70 ° C
Acrylic acid (AA): 95 ° C
Acrylonitrile (AN): 96 ° C

<Nonvolatile content (N.V.)>
About 1 g of the obtained aqueous resin dispersion was weighed, and after 110 hours at 110 ° C. with a hot air drier, the remaining amount after drying was regarded as a non-volatile content, and the ratio to the mass before drying was expressed in mass%.

Production Example 1
300 parts of deionized water was charged into a polymerization vessel equipped with a stirrer, a reflux condenser, a thermometer, a nitrogen inlet tube and a dropping funnel. Thereafter, the internal temperature was increased to 75 ° C. while stirring under a nitrogen gas stream. On the other hand, 200 parts of styrene, 95 parts of methyl methacrylate, 190 parts of 2-ethylhexyl acrylate, 15 parts of acrylic acid, 0.4 part of t-dodecyl mercaptan, Lebenol WZ (trade name, preliminarily adjusted to 20% aqueous solution) First stage monomer emulsion consisting of 90.0 parts Kao) and 97 parts deionized water was charged. Next, while maintaining the internal temperature of the polymerization vessel at 80 ° C., 8 parts of the above monomer emulsion, 5 parts of 5% aqueous potassium persulfate solution and 10 parts of 2% aqueous sodium hydrogensulfite solution were added, Polymerization was started. After 20 minutes, the remaining monomer emulsion was uniformly added dropwise over 120 minutes while maintaining the inside of the reaction system at 80 ° C. At the same time, 50 parts of a 5% aqueous potassium persulfate solution and 50 parts of a 2% aqueous sodium hydrogen sulfite solution were uniformly added dropwise over 120 minutes, and the same temperature was maintained for 60 minutes after completion of the addition.
Next, 100 parts of styrene, 95 parts of methyl methacrylate, 290 parts of butyl acrylate, 15 parts of acrylic acid, 0.4 part of t-dodecyl mercaptan, lebenol WZ previously adjusted to a 20% aqueous solution (trade name, manufactured by Kao Corporation) A second-stage monomer emulsion consisting of 90.0 parts and 97 parts of deionized water was charged and added dropwise uniformly over 120 minutes. At the same time, 50 parts of a 5% potassium persulfate aqueous solution and 50 parts of a 2% sodium hydrogen sulfite aqueous solution were uniformly added dropwise over 120 minutes, and the same temperature was maintained for 90 minutes after the addition was completed to complete the polymerization.
After cooling the obtained reaction liquid to room temperature, 6 parts of 25% aqueous ammonia was added, and the nonvolatile content was 55%, pH 7.0, viscosity 420 mPa · s, average particle size 230 nm, particle size distribution 22%, weight average molecular weight 170000, An emulsion (1) having a first stage Tg of 10 ° C., a second stage Tg of −10 ° C., and a total Tg of 0 ° C. was obtained.

Production Examples 2-9
Emulsions (2) to (9) were obtained in the same manner as in Production Example 1, except that the monomers and polymerization chain transfer agents shown in Table 1 were used in the formulation shown in Table 1. Table 1 shows the Tg and specifications of the obtained emulsion.

Production Example 10
Zinc oxide, ammonium hydrogen carbonate and ammonia are charged into a glass container so as to have a molar ratio of 1: 1: 3, stirred with a stirrer for 30 minutes, and a zinc carbonate ammine complex is obtained by a reaction represented by the following formula. It was.
ZnO + NH ₄ HCO ₃ + 3NH ₃ → [Zn (NH ₃ ) ₄ ] CO ₃

Examples 1-14, Comparative Examples 1-3, Reference Examples 1-2
By appropriately adding the drying accelerators shown in Tables 2-1 and 2-2 to the emulsion obtained in Production Example 100 parts (solid content) in the amounts shown in Tables 2-1 and 2-2, the present invention. The emulsion composition for heat drying and the emulsion composition for comparison were obtained. Examples 6 and 7 are examples in which a surfactant corresponding to the drying accelerator of the present invention was used as an emulsifier for obtaining an emulsion, and the surfactant remains in the emulsion.
These emulsion compositions for heat drying or comparative emulsion compositions are blended as follows, and as a damping material composition (damping material blend), the following test method is used to determine the surface state of the coating film during heating and drying. Damping performance was evaluated. The results are shown in Tables 2-1 and 2-2.
Heat drying emulsion composition or comparative emulsion composition 359 parts Calcium carbonate (NN # 200 ^{* 1} ) 620 parts Dispersant (Aquaric DL-40S ^{* 2} ) 6 parts Thickener (Acryset WR-650 ^{* 3} ) 4 Part defoaming agent (Nopco 8034L ^{* 4} ) 1 part Foaming agent (F-30 ^{* 5} ) 6 parts * 1: Nitto Flour Industry Co., Ltd. filler * 2: Nippon Shokubai Co., Ltd. polycarboxylic acid type dispersant (active ingredient) 44%)
* 3: Nippon Shokubai Co., Ltd. alkali-soluble acrylic thickener (active ingredient 30%)
* 4: Anti-foaming agent manufactured by San Nopco (main component: hydrophobic silicone + mineral oil)
* 5: Matsumoto Yushi Co., Ltd. foaming agent

<Moisture volatility>
On the steel plate (trade name “SPCC-SD”, 75 mm width × 150 mm length × 0.8 mm thickness, manufactured by Nippon Test Panel Co., Ltd.), the prepared damping material composition was applied so that the coating thickness was 5 mm. did. Then, using a hot air dryer, it is heated at 130 ° C. for 30 minutes, and the following formula:
Moisture volatility (%) = (coating after drying + weight of steel plate) / (coating before drying + weight of steel plate) × 100
The water volatilization rate was calculated. The higher this value, the better the drying property (drying efficiency, drying speed).

<Dry coating surface condition>
On the steel plate (trade name: SPCC-SD 75 mm width × 150 mm length × 0.8 mm thickness: manufactured by Nippon Test Panel Co., Ltd.), the produced damping material composition was applied so that the applied thickness was 3 mm. Then, it heated for 30 minutes at 150 degreeC using the hot air dryer, and evaluated the surface condition of the obtained dry coating film on the following references | standards.
○: No abnormality △: Cracks on the surface or interface, irregularities on the surface ×: The shape of the coating film cannot be maintained

<Vibration suppression test>
The obtained damping material composition was applied to a cold-rolled steel plate (SPCC, width 15 mm × length 250 mm × thickness 1.5 mm) at a thickness of 3 mm, dried at 150 ° C. for 30 minutes, and then on the cold-rolled steel plate A damping material film having a surface density of 4.0 kg / m ² was formed on the surface. The measurement of damping properties uses the cantilever method (loss factor measurement system manufactured by Ono Sokki Co., Ltd.), and the loss factor at each temperature (20 ° C, 40 ° C, 60 ° C) is determined by the resonance method (3 dB method). It was measured. In addition, the evaluation of the vibration damping performance was performed based on the total loss coefficient (the sum of the loss coefficients at 20 ° C., 40 ° C., and 60 ° C.). The larger the total loss coefficient, the better the vibration damping performance.

Details of the drying accelerators described in Tables 2-1 and 2-2 are as follows. In addition, the cloud point referred to the value described in each product catalog.
Emulgen 120P: polyoxyethylene lauryl ether (cloud point: 98 ° C., manufactured by Kao Corporation, nonionic surfactant)
Emulgen 1118S: polyoxyethylene alkyl ether (cloud point: 100 ° C., manufactured by Kao Corporation, nonionic surfactant)
Emar O: Sodium lauryl sulfate (manufactured by Kao Corporation, anionic surfactant)
Neoperex G-65: Sodium dodecylbenzenesulfonate (manufactured by Kao Corporation, anionic surfactant)
Emulgen 109P: polyoxyethylene lauryl ether (cloud point: 83 ° C., manufactured by Kao Corporation, nonionic surfactant)
LEVENOL WZ: Sodium polyoxyethylene alkylphenyl ether sulfate (manufactured by Kao Corporation, anionic surfactant)

From Tables 2-1 and 2-2, an emulsion and a drying accelerator specified as a nonionic surfactant having a cloud point of 90 ° C. or higher and / or an anionic surfactant not containing an ethylene glycol chain are included. By using the composition, it was confirmed that the advantageous effect that the drying rate is remarkably large and the vibration damping property is excellent can be exhibited.
For example, the technical significance of using a specific drying accelerator is clear when Examples 1 to 5 and Comparative Example 3 are compared. Examples 1 to 5 and Comparative Example 3 are examples carried out under the same conditions except that a specific drying accelerator is used or not, but the drying property (drying efficiency) is the same. The water volatilization rate (%), which is an index, was 80 to 85% in Examples 1 to 5, whereas it was remarkably inferior to 70% in Comparative Example 3, and was dried by using a specific drying accelerator. It can be seen that the efficiency is dramatically improved.

Regarding the technical significance of specifying the cloud point of the nonionic surfactant to 90 ° C. or higher, the cloud point of the nonionic surfactant used in Example 1 is 98 ° C., which is slightly higher than the lower limit. It is clear when compared with Comparative Example 1 using a nonionic surfactant (clouding point: 83 ° C.) below the lower limit. Example 1 and Comparative Example 1 are examples in which only the drying accelerator used is different, but the water volatilization rate (%), which is an indicator of drying property (drying efficiency), is 80% in Example 1. In contrast, Comparative Example 1 is significantly inferior at 65%. Therefore, when a nonionic surfactant is used, it is confirmed that an advantageous effect that a composition having a remarkably excellent drying efficiency can be obtained by using a clouding point of 90 ° C. or higher. It was done.

Regarding the technical significance of specifying an anionic surfactant as a compound not containing an ethylene glycol chain, Examples 3 to 5 using an anionic surfactant not containing an ethylene glycol chain, and containing an ethylene glycol chain It is clear when compared with Comparative Example 2 using an anionic surfactant. Example 3 and Comparative Example 2 differ only in the drying accelerator used, and Examples 4-5 and Comparative Example 2 differ only in the used drying accelerator and the amount used, The water volatilization rate (%), which is an index of property (drying efficiency), was 80 to 85% in Examples 3 to 5 and 71% in Comparative Example 2, which is inferior. In particular, it can be said that the difference between Examples 3 to 5 and Comparative Example 2 is remarkably large, considering that the amount used was also about 80% in Example 4 which was about 30% of Comparative Example 2. Therefore, when using an anionic surfactant, it was confirmed that the advantageous effect that the composition which was remarkably excellent in drying efficiency was able to be obtained by using what does not contain an ethylene glycol chain was confirmed. .

Moreover, from the comparison with Reference Examples 1 and 2 and Examples 4 and 5, the content in the composition of the heat drying agent is 1 to 10 parts with respect to 100 parts of the solid content of the emulsion. It was found that the vibration damping performance can be improved while increasing the speed (drying efficiency). Specifically, Examples 4 and 5 and Reference Examples 1 and 2 are all carried out under the same conditions except that the amount of the drying accelerator is different, but the lower limit (1 part of the above numerical range). In Reference Example 1 (0.8 parts) less than), the water volatilization rate, which is an index of drying efficiency, is 70%, and the total loss coefficient at each temperature, which is an index of vibration damping, is 0.306. On the other hand, in Example 4 (1.5 parts), which is slightly higher than the lower limit value, the total loss coefficient is the same value, but the moisture volatilization rate is 80% and the drying efficiency is improved. In Reference Example 2 (12.0 parts) exceeding the upper limit (10 parts) of the above numerical range, the moisture volatilization rate was 86% and the total loss coefficient was 0.259, whereas the upper limit was In Example 5 (8.0 parts), which is slightly lower, the water volatilization rate is equivalent to 85%, but the total loss factor is 0.289, which improves vibration damping. From these results, it was found that the drying efficiency and the vibration damping property can be balanced in a balanced manner by setting the content of the heat drying agent in the composition to 1 to 10 parts with respect to 100 parts of the solid content of the emulsion. .

Further, among the heat-drying emulsion compositions used in Examples 1 to 13 and Reference Examples 1 and 2, the glass transition temperature (total Tg) is -20 to 30 ° C, and the weight average molecular weight (Mw) is 20,000 to 40. In Examples 1 to 9 using emulsions (1) to (5), which are tens of thousands, it was found that the surface state of the dried coating film was better and the vibration damping performance was also high, so that it was particularly suitable. .
It was also confirmed that when a metal complex (zinc carbonate ammine complex) was added as a drying accelerator (Example 14), the heat drying property of the emulsion composition for heat drying was remarkably improved.

Claims (6)

An emulsion composition for heat drying comprising an emulsion obtained by polymerizing a monomer component containing an unsaturated carboxylic acid monomer and another copolymerizable unsaturated monomer,
The emulsion composition for heat drying contains a drying accelerator,
The drying accelerator is a nonionic surfactant having a cloud point of 90 ° C or higher and / or an anionic surfactant containing no ethylene glycol chain, and the emulsion composition for heat drying. 2. The emulsion composition for heat drying according to claim 1, wherein the content of the drying accelerator is 1 to 10 parts by weight with respect to 100 parts by weight of the solid content of the emulsion. The heating according to claim 1 or 2, wherein the emulsion has a glass transition point of -20 to 30 ° C, a weight average molecular weight of 20,000 to 400,000, and an average particle diameter of emulsion particles of 100 to 400 nm. Emulsion composition for drying. The monomer component includes a (meth) acrylic monomer as the unsaturated carboxylic acid monomer, and a (meth) acrylic monomer as the other copolymerizable unsaturated monomer. The emulsion composition for heat-drying according to any one of claims 1 to 3, comprising: A vibration damping composition comprising the emulsion composition for heat drying according to any one of claims 1 to 4. A method for producing an emulsion composition for heat drying comprising an emulsion obtained by polymerizing a monomer component containing an unsaturated carboxylic acid monomer and another copolymerizable unsaturated monomer,
The production method includes a step of adding a drying accelerator to an emulsion obtained by polymerizing the monomer component,
The drying accelerator is a nonionic surfactant having a cloud point of 90 ° C. or higher and / or an anionic surfactant containing no ethylene glycol chain.