JP5221185B2 - Damping paint composition - Google Patents

Description

  The present invention relates to a vibration-damping coating composition containing mica.

Conventionally, a vibration-damping coating composition containing an aqueous resin dispersion in which resin particles that form a coating film are dispersed in an aqueous dispersion medium and mica for enhancing the vibration damping properties of the coating film is known (for example, (See Patent Documents 1 to 4).
International Publication No. 97/42844 Pamphlet JP 2002-302583 A International Publication No. 99/28394 Pamphlet International Publication No. 01/40391 Pamphlet

  By the way, in the vibration-damping coating composition containing the aqueous resin dispersion, if a large amount of mica is blended, the vibration-damping performance of the coating film can be improved. At this time, the amount of mica added to the aqueous dispersion medium also increases. Here, since the thermal conductivity of mica is equivalent to the thermal conductivity of water, in a vibration-damping coating composition containing a large amount of mica, heat is hardly transmitted from the outside to the aqueous dispersion medium. As a result, the drying property of the vibration-damping coating composition is lowered. Therefore, it is considered that the drying rate of the vibration-damping coating composition is increased by including a carbon-based filler that has better thermal conductivity than mica. On the other hand, the vibration-damping coating composition may contain calcium carbonate for the purpose of improving the mechanical properties of the composition or the coating film, for example. However, when calcium carbonate is blended, there is a problem that even if a carbon-based filler is blended, the drying property is lowered.

  This invention has been made by finding that the drying rate of the vibration-damping coating composition is increased by the inventors containing calcium carbonate and a carbon-based filler at a predetermined mass ratio. An object of the present invention is to provide a vibration-damping coating composition that can increase the vibration-damping property by containing a large amount of mica and can improve the drying property of the vibration-damping coating composition.

In order to achieve the above object, the vibration-damping coating composition of the invention described in claim 1 includes an aqueous resin dispersion in which resin particles forming a coating film are dispersed in an aqueous dispersion medium, and the vibration damping of the coating film. The anti-vibration coating composition contains mica for enhancing the property, and the content of the mica is 150 parts by mass or more and 250 parts by mass with respect to 100 parts by mass of the resin particles contained in the composition. 150 parts by mass or more and 250 parts by mass or less with respect to 100 parts by mass of water contained in the composition , and at least one carbon-based filler and carbonic acid of carbon black, carbon fiber, and carbon nanotube Calcium is further contained, and the content of the carbon-based filler is 5 parts by mass or more with respect to 100 parts by mass of water contained in the composition, and the mass of the calcium carbonate (a ) And the mass (b) of the carbon-based filler, the mass ratio (a / b) is in the range of 1/3 to 1/1.

The gist of the invention described in claim 2 is that in the vibration-damping coating composition according to claim 1, the carbon-based filler is carbon black.
The gist of the invention described in claim 3 is that in the vibration-damping coating composition according to claim 1 or 2 , the resin particles are acrylic resin particles.

  ADVANTAGE OF THE INVENTION According to this invention, a damping property can be improved while containing a large amount of mica, and the drying property of a damping coating composition can be improved.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments embodying the present invention will be described in detail.
The vibration-damping coating composition in the present embodiment contains an aqueous resin dispersion in which resin particles that form a coating film are dispersed in an aqueous dispersion medium, and mica for improving the damping properties of the coating film. Mica is contained in an amount of 150 parts by mass or more with respect to 100 parts by mass of the resin particles contained in the composition. Moreover, 150 mass parts or more of mica is contained with respect to 100 mass parts of water contained in the composition. The vibration-damping coating composition further contains a carbon-based filler and calcium carbonate. The mass ratio (a / b) between the mass (a) of the calcium carbonate and the mass (b) of the carbon filler is in the range of 1/3 to 1/1.

  Examples of the polymer material constituting the resin particles include acrylic resins, acrylic / styrene resins, urethane resins, phenol resins, vinyl chloride resins, vinyl acetate resins, vinyl acetate / acrylic resins, ethylene / acetic acid. Examples thereof include at least one selected from vinyl resins, epoxy resins, polyester resins, alkyd resins, acrylonitrile / butadiene copolymer rubber, styrene / butadiene copolymer rubber, butadiene rubber, and isoprene rubber. These polymer materials may be modified.

  The resin particles may be formed of a single type of polymer material or may be formed of a plurality of types of polymer material. Furthermore, the aqueous resin dispersion may contain resin particles composed of these polymer materials alone, or may contain a plurality of types of resin particles.

  Among the polymer materials, an acrylic resin is preferable from the viewpoint that it is easy to adjust a temperature range in which vibration damping performance is exhibited to around room temperature. Examples of the acrylic resin include a homopolymer having acrylic acid, acrylic ester, methacrylic acid and methacrylic ester as monomers, a mixture of these homopolymers, and a copolymer obtained by polymerizing these monomers. Can be mentioned. Examples of acrylic acid esters and methacrylic acid esters include methyl esters, ethyl esters, propyl esters, 2-ethylhexyl esters, ethoxyethyl esters, and the like.

  Examples of the aqueous dispersion medium for dispersing the resin particles include water and a mixed liquid of water and a monohydric alcohol. Examples of the monohydric alcohol include methanol and ethanol. The aqueous resin dispersion can be obtained according to a known method such as emulsion polymerization in which a monomer and a polymerization initiator are dropped into an aqueous solution containing an emulsifier.

  Mica enhances the vibration damping properties of the coating film by filling the coating film when the coating film is formed from the resin particles. Examples of mica include natural mica and synthetic mica. The mica may be swellable mica or non-swellable mica.

  The mica content is 150 parts by mass or more, more preferably 160 parts by mass or more, and still more preferably 170 parts by mass or more with respect to 100 parts by mass of the resin particles contained in the vibration-damping coating composition. When the content of mica is less than 150 parts by mass with respect to 100 parts by mass of the resin particles contained in the vibration-damping coating composition, the vibration-damping property of the coating film cannot be sufficiently improved. The upper limit of the mica content relative to 100 parts by mass of the resin particles contained in the vibration damping coating composition is 250 parts by mass or less from the viewpoint of maintaining the dispersibility of the mica in the vibration damping coating composition and the coating film. It is preferable that

  The mica content is 150 parts by mass or more, preferably 160 parts by mass or more, and more preferably 170 parts by mass or more with respect to 100 parts by mass of water contained in the vibration-damping coating composition. When the content of mica is less than 150 parts by mass with respect to 100 parts by mass of water contained in the vibration-damping coating composition, sufficiently ensure the content of mica in the coating film formed from the resin particles. As a result, the vibration damping property of the coating film cannot be sufficiently improved. The upper limit of the mica content relative to 100 parts by mass of water contained in the vibration-damping coating composition is 250 parts by mass or less from the viewpoint of maintaining the dispersibility of mica in the vibration-damping coating composition and the coating film. Preferably there is.

  The carbon-based filler is contained to efficiently conduct the heat to the aqueous dispersion medium when the vibration-damping coating composition is heated. Examples of the carbon-based filler include carbon black, carbon fiber, and carbon nanotube. Among the carbon-based fillers, carbon black is preferable from the viewpoint that it can be easily dispersed in an aqueous resin dispersion and is easily available.

  In addition, when dispersing a carbon-type filler in a water-system resin dispersion liquid, you may mix | blend a dispersing agent as needed. From the viewpoint of more efficiently conducting heat to the aqueous dispersion medium, the carbon-based filler is preferably contained in an amount of 5 parts by mass or more with respect to 100 parts by mass of water contained in the composition.

  Calcium carbonate should be contained so that the mass ratio (a / b) of the mass (a) of the calcium carbonate and the mass (b) of the carbon filler is in the range of 1/3 to 1/1. Thus, the drying speed is increased when the vibration-damping coating composition is heated and dried. This calcium carbonate is in the form of a powder, and examples thereof include precipitated calcium carbonate and heavy calcium carbonate. The average particle diameter of calcium carbonate is preferably smaller than the average particle diameter of mica from the viewpoint of ensuring the dispersibility of mica in the vibration-damping coating composition. The average particle size of calcium carbonate is preferably 50 μm or less, more preferably 30 μm or less, and even more preferably 10 μm or less. Further, since precipitated calcium carbonate is easily formed into finer particles than heavy calcium carbonate, it is preferable to contain precipitated calcium carbonate.

  The vibration-damping coating composition includes, as other components, vibration damping agents, gelling agents, foaming aids, viscosity modifiers, thickeners, flow improvers, curing agents, antifoaming agents, film-forming aids. Antifreezing agents, anti-settling agents and the like can be blended as necessary. In order to further improve the vibration damping properties of the resulting coating film, the vibration damping coating composition preferably contains a vibration damping imparting agent. Examples of the vibration damping imparting agent include at least one compound selected from a benzothiazyl compound, a benzotriazole compound, a diphenyl acrylate compound, a normal phosphate ester compound, and an aromatic secondary amine compound.

  Examples of the benzothiazyl compound include N, N-dicyclohexylbenzothiazyl-2-sulfenamide (DCHBSA), 2-mercaptobenzothiazole (MBT), dibenzothiazyl disulfide (MBTS), N-cyclohexylbenzothiazyl-2- Sulfenamide (CBS), Nt-butylbenzothiazyl-2-sulfenamide (BBS), N-oxydiethylenebenzothiazyl-2-sulfenamide (OBS), and N, N-diisopropylbenzothia There may be mentioned at least one selected from dil-2-sulfenamide (DPBS).

  The benzotriazole-based compound is a compound in which a benzotriazole having an azole group bonded to a benzene ring is used as a mother nucleus and a phenyl group is bonded thereto, and 2- [2′-hydroxy-3 ′-(3 ″, 4 ″, 5 ″, 6 ″ -tetrahydrophthalimidomethyl) -5′-methylphenyl] benzotriazole (2HPMMB), 2- (2′-hydroxy-5′-methylphenyl) benzotriazole (2HMPB), 2- (2 '-Hydroxy-3'-t-butyl-5'-methylphenyl) -5-chlorobenzotriazole (2HBMPCB), 2- (2'-hydroxy-3', 5'-di-t-butylphenyl) -5 -Chlorobenzotriazole (2HDBPCB) and 2- (2'-hydroxy-5'-t-octylphenyl) benzoto It includes at least one selected from azoles (2HOPB).

  Examples of the diphenyl acrylate compound include at least one selected from ethyl-2-cyano-3,3-diphenyl acrylate (ECDPA) and octyl-2-cyano-3,3-diphenyl acrylate (OCDPA).

  Examples of orthophosphate compounds include trimethyl phosphate, triethyl phosphate, tributyl phosphate, tris (2-ethylhexyl) phosphate, tris (butoxyethyl) phosphate, triphenyl phosphate, tricresyl phosphate, trixylenyl phosphate, cresyl Examples thereof include at least one selected from diphenyl phosphate and 2-ethylhexyl diphenyl phosphate.

  Examples of the aromatic secondary amine compound include p- (p-toluenesulfonylamide) diphenylamine, N, N′-di-2-naphthyl-p-phenylenediamine, and N, N′-diphenyl-p-phenylenediamine. N-phenyl-N′-isopropyl-p-phenylenediamine, N-phenyl-N ′-(1,3-dimethylbutyl) -p-phenylenediamine, N-phenyl-1-naphthylamine, alkylated diphenylamine, octylated Examples thereof include at least one selected from diphenylamine and 4,4′-bis (α, α-dimethylbenzyl) diphenylamine.

The content of the vibration damping imparting agent is preferably 1 to 10 parts by mass with respect to 100 parts by mass of the resin particles.
Gelling agents are classified into organic gelling agents and inorganic gelling agents. Examples of organic gelling agents include starch and starch derivatives. Examples of inorganic gelling agents include ammonium nitrate, calcium nitrate, potassium carbonate, and chloride. Examples include potassium, calcium chloride, and ammonium chloride. Moreover, you may contain fillers other than mica, calcium carbonate, and a carbon-type filler. Examples of such fillers include talc, clay, barium sulfate, magnesium carbonate, aluminum oxide, glass, silica, aluminum, aluminum hydroxide, iron, asbestos, titanium oxide, iron oxide, diatomaceous earth, zeolite, and ferrite.

The vibration-damping coating composition can be prepared by mixing a water-based resin dispersion, mica, carbon-based filler, calcium carbonate and the like using a known mixing means such as a stirrer.
The damping paint composition thus configured contains 150 parts by mass or more of mica with respect to 100 parts by mass of the resin particles. For this reason, the coating film formed through the drying of the vibration-damping coating composition contains a large amount of mica. As a result, the damping property of the coating film is sufficiently enhanced by the mica. The vibration damping performance of the vibration damping coating composition is indicated by the loss coefficient or loss elastic modulus of the vibration damping coating composition. That is, the higher the value of the loss coefficient or the loss elastic modulus of the vibration-damping coating composition, the better the vibration-damping performance of the vibration-damping coating composition. The loss coefficient of the vibration-damping coating composition can be measured by a well-known central vibration method loss coefficient measuring device, and the loss elastic modulus can be measured by a well-known dynamic viscoelasticity measuring device.

  Here, although mica can improve the vibration damping properties of the coating film, the thermal conductivity of mica is equivalent to that of water, so when heating a vibration-damping coating composition containing a large amount of mica, aqueous dispersion It becomes difficult for heat to be transmitted to the medium. In this regard, the vibration-damping coating composition of this embodiment contains a carbon-based filler and calcium carbonate so as to have a predetermined mass ratio. For this reason, the drying rate of the vibration-damping coating composition can be increased.

  The vibration-damping coating composition can be used in various fields required for suppressing vibration energy. Examples of the application field of the vibration-damping coating composition include automobiles, wall materials, floor materials, roof materials, building materials such as fences, home appliances, and industrial machines.

The effects exhibited by this embodiment will be described below.
(1) Mica is contained in an amount of 150 parts by mass or more with respect to 100 parts by mass of water contained in the vibration-damping coating composition, and 150 parts by mass or more with respect to 100 parts by mass of resin particles contained in the composition. Yes. By containing such mica, the vibration damping property of the coating film can be sufficiently enhanced. In such a vibration-damping coating composition, since the carbon-based filler and calcium carbonate are contained so as to have the above-described mass ratio, the drying speed of the vibration-damping coating composition can be increased. Therefore, by containing a large amount of mica, the vibration damping property can be enhanced and the drying property of the vibration damping coating composition can be enhanced.

  (2) When the carbon-based filler is contained in an amount of 5 parts by mass or more with respect to 100 parts by mass of water contained in the composition, heat is more efficiently conducted to the aqueous dispersion medium. As a result, when the vibration-damping coating composition is heated and dried, the drying property can be further enhanced.

  (3) Since the resin particles are acrylic resin particles, it is easy to adjust the temperature range where the vibration damping performance is exhibited to around room temperature, and thus the practicality can be improved.

Next, the embodiment will be described more specifically with reference to examples and comparative examples.
(Examples 1 and 2)
Mica, carbon black, calcium carbonate, and the like were blended into the aqueous resin dispersion and mixed using a stirrer to prepare the vibration-damping coating composition of each example. The mica blended in the vibration-damping coating composition of each example is a mixture of mica having an average particle size of 28 μm and mica having an average particle size of 44 μm. Carbon black has an average particle size of 120 μm and calcium carbonate has an average particle size of 1.3 μm. Table 1 shows the content of each component in parts by mass. The vibration-damping coating composition of each example contains a vibration-damping property imparting agent, a dispersing agent, a thickener, a film-forming aid, and the like in equal amounts. As the vibration damping agent, N-cyclohexylbenzothiazyl-2-sulfenamide (CBS) is blended.

(Comparative Examples 1-3)
In Comparative Examples 1 to 3, as shown in Table 1, vibration damping coating compositions were prepared in the same manner as in each Example without blending at least one of carbon black and calcium carbonate.

(Comparative Example 4)
In Comparative Example 4, a vibration-damping coating composition was prepared in the same manner as in each Example except that the mass ratio of carbon black and calcium carbonate was changed.

＜熱重量の測定＞
各制振塗料組成物を加熱した際の減量率について、示差熱熱重量同時測定装置（ＴＧ／ＤＴＡ６２００、セイコーインスツル株式会社製）により測定した。この測定においては、開始温度を３０℃、及び、昇温速度を１１０℃／ｍｉｎに設定するとともに、１４０℃に保持した際の熱重量を測定した。その結果を表２に示している。なお、表２に示される数値の単位は、質量％である。

<Measurement of thermogravimetry>
About the weight loss rate at the time of heating each damping coating composition, it measured with the differential thermothermal weight simultaneous measuring apparatus (TG / DTA6200, Seiko Instruments Inc. make). In this measurement, the starting temperature was set to 30 ° C., the temperature rising rate was set to 110 ° C./min, and the thermogravimetric weight was measured when held at 140 ° C. The results are shown in Table 2. The unit of the numerical values shown in Table 2 is mass%.

表１に示されるように各実施例においては、炭酸カルシウムの質量（ａ）とカーボンブラックの質量（ｂ）との質量比（ａ／ｂ）が１／３及び１／１である。そして表２の結果から明らかなように、２分後及び３分後において、実施例１及び２の熱重量（質量％）は、各比較例の熱重量（質量％）よりも低い値を示している。この結果から、各実施例の制振塗料組成物においては、各比較例の制振塗料組成物よりも乾燥速度が速まっていることがわかる。

As shown in Table 1, in each example, the mass ratio (a / b) between the mass (a) of calcium carbonate and the mass (b) of carbon black is 1/3 and 1/1. As is apparent from the results in Table 2, after 2 minutes and 3 minutes, the thermal weight (mass%) of Examples 1 and 2 is lower than the thermal weight (mass%) of each comparative example. ing. From this result, it can be seen that in the vibration-damping coating composition of each example, the drying speed is faster than that of each comparative example.

Claims (3)

A vibration-damping coating composition comprising an aqueous resin dispersion in which resin particles forming a coating film are dispersed in an aqueous dispersion medium, and mica for enhancing the vibration damping properties of the coating film,
Content of the mica is 150 parts by mass or more and 250 parts by mass or less with respect to 100 parts by mass of the resin particles contained in the composition , and 150 parts by mass with respect to 100 parts by mass of water contained in the composition. It is not less than 250 parts by mass and further contains at least one carbon-based filler and calcium carbonate of carbon black, carbon fiber, and carbon nanotube, and the content of the carbon-based filler is in the composition. 5 parts by mass or more with respect to 100 parts by mass of water contained,
Damping paint composition, wherein the weight ratio of the mass (b) of the mass (a) and the carbon-based filler of the calcium carbonate (a / b) is in the range of 1 / 3-1 / 1 . The vibration-damping coating composition according to claim 1, wherein the carbon-based filler is carbon black. The vibration-damping coating composition according to claim 1 or 2 , wherein the resin particles are acrylic resin particles.