JP4592316B2 - Damping paint and damping member using the same - Google Patents

Description

  The present invention relates to a vibration-damping coating material and a vibration-damping member, and relates to a material that can obtain good vibration-damping performance and that does not damage the surface of the vibration-damping layer without impairing properties as a coating material without using an antifoaming agent.

  In recent years, with mechanization and automation, paints and members having functions such as sound absorption, sound insulation, vibration proof, and vibration control have been attracting attention as measures against noise and vibration. Of these, the vibration damping function is to prevent noise by attenuating vibration energy.

  As such a vibration-damping coating material, there are rubber-like substances, bituminous substances, thermoplastic resins, and the like to which inorganic fillers and various fibers are added. (See Patent Document 1)

JP-A-9-151335 (Claim 1)

  However, in such a vibration-damping coating, when a large amount of inorganic filler is contained, it is difficult to obtain a stable vibration-damping performance due to problems such as an increase in the viscosity of the coating, foaming, etc. There was a problem.

  As a result of intensive studies to solve the above-mentioned problems, the present inventor has found that the problem can be solved by using sericite as an inorganic filler.

That is, damping coatings of the present invention, at least a damping coatings composed of a binder resin and an inorganic filler, the damping paint is viewed including the sericite as the inorganic filler, relative to 100 parts by weight of the binder resin The sericite is contained in an amount of 100 to 500 parts by weight .

  Furthermore, the vibration damping member of the present invention has a vibration damping layer on a base material, and the vibration damping layer is formed of the vibration damping paint.

  The vibration-damping paint of the present invention can obtain stable vibration-damping performance without causing problems such as an increase in paint viscosity and foaming even when a large amount of an inorganic filler is contained. it can.

  First, the vibration damping paint of the present invention will be described. The vibration-damping paint of the present invention is a vibration-damping paint comprising at least a binder resin and an inorganic filler, and is characterized by containing sericite as the inorganic filler.

  Examples of the binder resin constituting the vibration-damping paint include acrylic ester copolymer, styrene-acrylic ester copolymer, ethylene-vinyl acetate copolymer, vinyl acetate polymer, acrylic-vinyl acetate copolymer, and chloride. Examples thereof include vinyl polymers, vinyl chloride-acrylic copolymers, vinylidene chloride polymers, butadiene polymers, styrene-butadiene copolymers, acrylonitrile-butadiene copolymers, and the like.

  Sericite, which is used as an inorganic filler, is a kind of mica (mica), and is a mineral that has less potassium and more water than muscovite, which is generally used as industrial mica, and is intermediate between muscovite and illite. When this sericite was used, it was found that the increase in paint viscosity and foaming that are likely to occur in paints when other mica such as muscovite was used were suppressed. Since an increase in viscosity can be suppressed, the filling rate of the inorganic filler when used as a paint can be increased. Moreover, since foaming can be suppressed in this way, good vibration damping performance can be obtained without foaming the coating film. When used in the vibration-damping coating material of the present invention, the average particle size of sericite is preferably 100 μm or less. When the average particle size is smaller than 100 μm, the increase in viscosity of the paint can be suppressed, and the paint can easily prevent air from becoming inferior and difficult to handle, and it is difficult to be defective when applied. Because.

  Moreover, it is preferable that a sericite is contained 100-500 weight part with respect to 100 weight part of binder resin. The reason why the lower limit is set to 100 parts by weight is that if it is less than this, vibration damping performance cannot be obtained sufficiently. The upper limit of 500 parts by weight is that the viscosity of the paint increases at 200 to 300 parts by weight with other mica, whereas sericite has no problem with the paint and coating film up to 500 parts by weight. This is because an increase in the viscosity of the paint occurs from around this point, and it becomes almost non-uniform and brittle, and the vibration damping performance becomes unstable.

  In this way, sericite can be used in a larger amount than muscovite or the like, and there is no problem as a paint. This is preferable because the vibration performance is good.

  By using sericite in this way, even when a large amount of sericite is contained in the binder resin, the viscosity of the paint does not increase drastically and problems such as foaming do not occur. Obtainable.

  Moreover, when sericite or muscovite is mixed to the binder resin to the same extent, there is no great difference in the vibration damping performance in the low temperature region, but the vibration damping performance in the high temperature region (30 to 60 ° C.) It is better to use.

  The vibration-damping paint of the present invention is prepared by dispersing the binder resin and sericite in an appropriate solvent. In consideration of the environment, a material in which a binder resin is a water-based resin emulsion is diluted with a water-based solvent as necessary, and a sericite is mixed and dispersed so that a vibration-damping coating is particularly preferable.

  In addition to the binder resin and sericite, the vibration-damping coating of the present invention includes a crosslinking agent, a filler, a colorant, a matting agent, a lubricant, an antistatic agent, a flame retardant, an antibacterial agent, an antibacterial agent as necessary. Molding agents, ultraviolet absorbers, light stabilizers, antioxidants, plasticizers, leveling agents, pigment dispersants, flow regulators, and the like can be blended.

  Next, the vibration damping member of the present invention will be described. The vibration damping member of the present invention has a vibration damping layer formed of the vibration damping paint on the base material.

  Examples of the substrate include resin films such as polyethylene terephthalate, polycarbonate, polyethylene naphthalate, polypropylene, polyvinyl chloride, polyethylene, polymethyl methacrylate, polyacrylonitrile, and triacetyl cellulose. The substrate may be transparent or opaque, and may be colored or uncolored. It is also possible to provide a damping layer on the separator, peel off the separator, and use only the coating film as the damping member. And it can also use as a base material what uses a steel plate or requires a direct damping performance.

  Although it does not specifically limit as thickness of a damping layer, It is preferable to set it as the range of 0.1 mm to 3 mm. The reason why the thickness is 0.1 mm or more is that if the thickness is too thin, sufficient vibration damping performance cannot be obtained. This is because it takes a lot of thickness and is also uneconomical.

  The vibration-damping layer is formed by applying the above-described vibration-damping paint of the present invention to the above-described base material by a conventionally known coating method such as a bar coater, die coater, blade coater, spin coater, roll coater, gravure coater, flow coater, spray, After applying by screen printing or the like, it can be formed by drying and curing with heat.

  The vibration damping layer thus formed has a high surface hardness, and has a pencil hardness of H or higher according to JIS K5600-5-4: 1999. Although the reason is not certain, it is considered that the inorganic filler is closely packed in the coating film.

  Further, the vibration damping member has a surface of the vibration damping layer or base material that becomes the surface of the vibration damping member, or when a separator is used as the base material, the surface of the vibration damping layer or between the vibration damping layer and the base material. An adhesive layer may be provided as appropriate. As the pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer, generally used acrylic pressure-sensitive adhesives, silicone-based pressure-sensitive adhesives, urethane-based pressure-sensitive adhesives, rubber-based pressure-sensitive adhesives, and the like are used. Moreover, you may use the adhesive which has performances, such as antistatic. The thickness of the pressure-sensitive adhesive layer is not particularly limited, but considering stickability, the lower limit is 1 μm or more, preferably 5 μm or more, and the upper limit is 60 μm or less, preferably about 40 μm or less. . In the case where an adhesive layer is provided, it is preferable that a separator is bonded to the adhesive layer in consideration of handleability.

  Such damping members include precision equipment, home appliances, OA equipment, various vehicles such as automobiles, railway vehicles, industrial vehicles, building structures, various structures such as elevated roads, viaducts, and other structures. Used to reduce vibration and noise generated in objects, equipment and machinery. In particular, the vibration damping member of the present invention can be preferably used for an apparatus that reaches a high temperature exceeding 40 ° C. during use, such as an automobile, a railway vehicle, a home appliance, or an OA device.

  The following examples further illustrate the present invention. “Parts” and “%” are based on weight unless otherwise specified.

[Example 1]
As a base material, a damping layer coating liquid having the following formulation was applied to one side of a 100 μm-thick plastic film so that the thickness after drying was 1 mm, and a damping layer was provided. A member was prepared.

<Damping layer coating solution>
-208 parts by weight of styrene-butadiene copolymer resin emulsion (SR-105: Nippon A & L Co., Ltd.) (solid content 48%)
・ 118 parts by weight of water ・ Sericite (average particle size 10 μm) 200 parts by weight (sericite MK: Kanaya Kosan Co., Ltd.)

[Example 2]
A damping member of Example 2 was produced in the same manner as in Example 1 except that 200 parts by weight of sericite in the damping layer coating liquid of Example 1 was changed to 100 parts by weight.

[Example 3]
A damping member of Example 3 was produced in the same manner as in Example 1 except that 200 parts by weight of sericite in the damping layer coating solution of Example 1 was changed to 300 parts by weight.

[Example 4]
A damping member of Example 4 was produced in the same manner as in Example 1 except that 200 parts by weight of sericite in the damping layer coating solution of Example 1 was changed to 500 parts by weight.

[ Reference example]
A damping member of a reference example was produced in the same manner as in Example 1 except that 200 parts by weight of sericite in the damping layer coating solution of Example 1 was changed to 600 parts by weight.

[Comparative Example 1]
As a base material, a damping layer coating liquid having the following formulation was applied to one side of a 100 μm thick plastic film so that the thickness after drying was 1 mm, and a damping layer was provided. A member was prepared.

<Damping layer coating solution>
-208 parts by weight of styrene-butadiene copolymer resin emulsion (SR-105: Nippon A & L Co., Ltd.) (solid content 48%)
・ 118 parts by weight of water ・ Mucite (average particle size 10 μm) 200 parts by weight (Kuralite Mica 500D: Kuraray)

[Comparative Example 2]
A damping member of Comparative Example 2 was produced in the same manner as Comparative Example 1 except that 200 parts by weight of muscovite of the damping layer coating liquid of Comparative Example 1 was changed to 300 parts by weight.

[Comparative Example 3]
A damping member of Comparative Example 3 was produced in the same manner as Comparative Example 1 except that 200 parts by weight of muscovite of the damping layer coating liquid of Comparative Example 1 was changed to 400 parts by weight.

[Comparative Example 4]
As a base material, a damping layer coating solution having the following formulation was applied to one side of a 100 μm thick plastic film so that the thickness after drying was 1 mm, and a damping layer was provided. A member was prepared.

<Damping layer coating solution>
-208 parts by weight of styrene-butadiene copolymer resin emulsion (SR-105: Nippon A & L Co., Ltd.) (solid content 48%)
-118 parts by weight of water-muscovite (average particle size 5 μm) 200 parts by weight (MICA POWDER A-11: Yamaguchi Mica Industry)

[Comparative Example 5]
A damping member of Comparative Example 5 was produced in the same manner as Comparative Example 4 except that 200 parts by weight of muscovite of the damping layer coating liquid of Comparative Example 4 was changed to 300 parts by weight.

The antifoaming property of the damping layer coating solution (damping paint) used in Examples, Reference Examples and Comparative Examples was evaluated. In addition, with respect to the coating properties of the damping members obtained in Examples, Reference Examples and Comparative Examples, the following tests are carried out to determine whether or not the coating material is formed as a film when the paint is dried, that is, it does not cause uniformity or cracking. And evaluated. Furthermore, the hardness of the damping layer surface of the damping member was also evaluated. The evaluation results are shown in Table 1.

(1) Evaluation of antifoaming property The antifoaming property was evaluated about the coating material adjusted as mentioned above. As an evaluation method, when the coating was made into a coating, the cross section of the coating was observed and there was no defect that was recognized as a bubble. did.

(2) Evaluation of film property Regarding film property, it is good to evaluate whether it is formed as a film when the paint is dried, that is, it does not cause film uniformity or cracking. That is not uniform, is indicated by Δ, and bad is indicated by ×.

(3) Evaluation of surface hardness About the surface hardness of the damping member obtained by the Example and the comparative example, it evaluated based on the tester method of the pencil scratch value of JISK5600-5-4: 1999.

  In the above damping layer coating solution, the amount of water added to the resin pigment ratio of 100: 200 (Example 1, Comparative Example 1, and Comparative Example 4) was changed to make a liquid with a solid content of 67%. Table 2 shows a comparison of liquid viscosities measured using a viscometer with a shear rate of 200 (1 / sec).

Since the damping members of Examples 1 to 4 and Reference Example using sericite contained an appropriate amount of inorganic filler, as shown in Table 1, the coating properties were good. However, the damping member of the reference example was slightly inferior in film property to the damping member of other examples because the content of the inorganic filler was increased. The damping members of Comparative Example 1 and Comparative Example 2 had good coating properties because the content of the inorganic filler was small, but the damping members of Comparative Examples 3 to 5 were inorganicly filled with the binder resin. Since the agent could not be sufficiently retained, coating film cracking occurred and the film property was inferior.

  And the defoaming property of the paint was also good by using sericite. Further, the vibration damping members of Comparative Example 4 and Comparative Example 5 are inferior in defoaming property and, in addition, inferior in coating properties, so that the pigment in the coating film becomes uneven and brittle, and good vibration damping performance is obtained. It is considered impossible.

Moreover, the damping member of Examples 1-4 and the reference example had the high surface hardness of the damping layer, and brought the favorable result. On the contrary, it can be seen that the damping members of Comparative Examples 1 to 3 have a low surface hardness of the damping layer and are easily damaged.

  Further, from Table 2, the liquid viscosity is much lower than the other ones even though the sericite is used, and even when the solid content is increased to 67%, Comparative Example 1, 4 with a solid content of 57%. Therefore, when sericite is used, the liquid viscosity can be lowered, and the filling rate can be raised.

  Next, on the damping layer of the damping member obtained in Examples 1 to 3 and Comparative Examples 1 and 2, the adhesive layer coating solution having the following formulation was applied and dried so that the thickness after drying was 30 μm. An adhesive layer was formed.

<Adhesive layer coating solution>
・ SK Dyne 1310 (33% solid content) 100 parts by weight (Soken Chemical Co., Ltd.)
・ L-45 (solid content: 100%) 1.5 parts by weight (Soken Chemical Co., Ltd.)

  Regarding the damping performance of the obtained damping member with an adhesive layer, an aluminum plate having a length of 200 mm, a width of 10 mm, and a thickness of 1.0 mm, in accordance with the vibration damping characteristic test method of the damping steel plate specified in JIS G0602: 1993 About the test piece affixed on the single side | surface of this through the adhesion layer, the loss coefficient by the center excitation half width method was measured and evaluated at -10-60 degreeC. FIG. 1 shows the measurement results of the loss factor at each temperature of the damping member of Example 1 and Comparative Example 1. Table 3 shows loss factors at temperatures of 0 ° C., 20 ° C., and 40 ° C. (500 Hz) for Examples 1 to 3 and Comparative Examples 1 and 2.

  It can be seen from Table 3 that the loss factor increases as the inorganic filler increases. As is clear from FIG. 1, the sericite used at 40 ° C. or higher has a higher loss factor than other mica, and the vibration damping performance is much better.

  As described above, by using sericite as in the examples, it becomes very advantageous as a paint because the viscosity is lower and foaming is less likely to occur than when other mica is used at the same rate. . In addition, since the viscosity is low, if the viscosity is about the same as when other mica is used, the ratio of the pigment can be increased, thereby improving the vibration damping performance.

  Even if the proportion of the pigment is increased, the film property is better than other mica. By using sericite, it is possible to provide a damping member that is more advantageous than muscovite in a high temperature range without deteriorating the damping performance.

The figure which shows the loss coefficient in each temperature of the damping member of Example 1 and Comparative Example 1.

Claims (2)

A damping paint comprising at least a binder resin and an inorganic filler, the damping paint is viewed including the sericite as the inorganic filler, per 100 parts by weight of the binder resin, the sericite from 100 parts by weight of 500 A vibration-damping paint characterized by containing parts by weight .   A vibration damping member comprising a vibration damping layer on a base material, wherein the vibration damping layer is formed of the vibration damping paint according to claim 1.

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