WO1999006491A1

WO1999006491A1 - Damping paint

Info

Publication number: WO1999006491A1
Application number: PCT/JP1997/002692
Authority: WO
Inventors: Yasuyuki Ohira; Mitsuo Hori
Original assignee: Shishiai-Kabushikigaisha
Priority date: 1997-07-31
Filing date: 1997-07-31
Publication date: 1999-02-11

Abstract

A damping paint for application to automobiles, interior materials, building materials, domestic electric appliances and the like in their places where a vibration is created. The paint comprises mica flakes having a weight-average aspect ratio of 20 to 60 and contained in a coating component having a glass transition temperature of -20 to 80 °C and, when applied to the above various fields, can form a damping layer having a vibrational energy absorption capacity much superior to the conventional damping paints in the service temperature range.

Description

Satsuki Itoda

TECHNICAL FIELD The present invention relates to a vibration-damping paint that can be applied to a place where vibration occurs, such as an automobile, an interior material, a building material, and an electric home appliance, and can form a vibration-damping layer having excellent vibration energy absorption performance. 2. Description of the Related Art Conventionally, in places where vibration occurs, such as in automobiles, interior materials, building materials, and home appliances, a sheet-shaped vibration-damping sheet has been generally used as a member for absorbing the vibration energy. However, in the case of a damping sheet, it must first be cut into a size and shape corresponding to the application area. In addition, since the damping sheet is attached to the application area using an adhesive or a pressure-sensitive adhesive, most of the attaching work is manual, and there was a problem that the working efficiency was poor. In particular, the damping sheet cannot be stuck on the application area such as a curved surface or a narrow gap, or even if it can be stuck, it easily peels off. Was required. In view of these problems, in recent years, mica flakes and the like have been added to coating components mainly composed of viscoelastic polymers such as rubber, plastic, and asphalt. So-called damping paints have been proposed. This damping paint can easily form a damping layer simply by spraying the damping paint on the application area, and does not require cutting or pasting work as in the case of damping sheets. It has the advantage that the damping layer can be easily formed even in a narrow gap. Further, in the case of the damping paint, since the damping paint is simply sprayed on the applied portion, the work can be performed using a robot or the like, and there is an advantage that the work efficiency can be greatly improved. However, although the conventional damping paint has the above-mentioned advantages, the thickness of the damping layer formed by the damping paint is limited to 3 mm, and high performance is required. Could not be applied to any part. The present invention has been made in view of such technical problems, and an object of the present invention is to provide a damping paint capable of forming a damping layer having excellent vibration energy absorption performance in a use temperature range. It is. DISCLOSURE OF THE INVENTION Hereinafter, the damping paint of the present invention will be described in detail. The vibration damping paint of the present invention is applied in a wide range of fields such as automobiles, interior materials, building materials, and home electric appliances, and contains mica flakes in a coating film component. As a coating film component, in order to maximize the absorption performance of vibration energy in the use temperature range of each use field described above, a glass transition point of 120 ° C. A polymer adjusted to 80 ° C., more preferably 0 to 40 ° C. is used. Specifically, a homopolymer of acrylate or methacrylate, a mixture of these homopolymers, a copolymer thereof, or a homopolymer of acrylate or methacrylate and a homopolymer of styrene Acryl-styrene blended with styrene or copolymerized with styrene And high polymers such as copolymers. In addition, plasticizers such as di-2-ethylhexyl phthalate (DOP), dibutyl phthalate (DBP) and diisononyl phthalate (DINP) may be added to the above-mentioned coating film components in order to adjust the film properties. A cross-linking agent may be added for primary curing. As the coating film component, in addition to the above-mentioned components, a polyurethane-based or asphalt-based component used as a coating film component in a conventional vibration damping paint can be used in combination. In addition, when selecting coating film components, handleability, moldability, availability, and temperature performance (heat resistance and cold resistance) are determined according to the application temperature and the application to which the vibration-damping coating is applied, in addition to the above-mentioned temperature range. ), Weather resistance, price, etc. should be considered. Mica flake is a component that dramatically increases the vibration damping performance of the coating film component, and has a weight average aspect ratio of 20 to 60, more preferably 30 to 40. If the weight average aspect ratio is less than 20, no sufficient improvement in damping properties can be expected, and a coating film having excellent damping properties cannot be obtained. On the other hand, when the weight average aspect ratio is more than 60, not only the film formation becomes difficult, but also a problem that a spray nozzle is easily clogged when spraying the paint is caused. become. The content of the mica flakes is desirably 30 to 90% by weight in the dried coating film. This is because, when the content of mica flakes is less than 30% by weight, no improvement in damping performance is observed. Conversely, when the content of mica flakes exceeds 90% by weight, If the film becomes difficult, it will cause adverse effects. The vibration damping paint of the present invention is obtained by dispersing mica flakes in the above-mentioned coating film components in water or alcohol and using it as an emulsion. Other components such as a powder, a film-forming aid, a wetting agent, a thickener, a defoamer, a viscosity modifier and a coloring agent are also added as needed. In addition, this damping paint is obtained by dispersing a composition containing the above-mentioned coating component Ji, a mica flake as a filler, a dispersing medium such as water and alcohol, and, if necessary, a dispersing agent and a thickening agent. In the case of applying the vibration damping paint by using a known mixer such as an air spray gun, an air spray gun, an air spray gun, or a brush coating method may be used. it can. Example As shown in Table 1 below, an acrylic resin copolymer was used as a coating film component, a mica flake-containing damping paint was applied to the substrate, and the damping coating formed on the substrate surface was used. The loss factor (77) and the peak temperature of the shake layer were measured. The applicability of the damping layer in each example was also evaluated visually. The results are shown in Tables 2-1 and 2-2. The measurement of the loss coefficient (r /) for each damping layer was performed using a central vibration method loss coefficient measuring device (CF 5200 Eve) manufactured by Ono Sokki Co., Ltd.

(Hereinafter the margin)

Coating film component “7 Kryl-styrene both mica flakes (weight average as outside ratio)

Polymer or acrylic acid I stell

Homopolymer ”20 30 38 40 60 (Glass transition point. C) Kuraray (\ n 'n)

325HK 325S 200H 300 200W Dainippon Ink & Chemical Example 1 l / U 1! J Example 1 'J 4 τ: Example R

9422

(80 ° C) 9470 10 6 7 8 9 9 (78 ° C) EC877 1 1 12 13 13 14 15 (75 ° C) EC847 16 Example 17 Example 18 Example 19 Example 20 (45 ° C) BC280 Example 2 1 Example 22 Example 23 Example 24 Example 25 (25 ° C)

Incidentally, the mixing ratio of the coating film component / mica flake was adjusted such that the weight ratio was 35/65 in the state of the dried coating film. As other components in the damping paint, 100% by weight of the whole paint (89.2 wt. %), 0.3% by weight of a dispersant (Soda tripolyphosphate, manufactured by Dainippon Ink and Chemicals, Inc.) and 0.1% by weight of an antifoaming agent (Formaster I PC, manufactured by San Nopco Co., Ltd.) 0.7% by weight of a film-forming aid (ethylene glycol, manufactured by Mitsubishi Chemical Corporation), 0.4% by weight of a thickener (Aron A30, manufactured by Toagosei Co., Ltd.), and a colorant (Disperse Black) And 1.8% by weight of Dainippon Ink and Chemicals, Inc., and 7.5% by weight of a viscosity modifier (water).

(Hereinafter the margin)

Table 2 1

Example Loss factor (7?) Beak value Loss factor () Peak temperature Applicability Example 1 0.085 80 例 Example 2 0.089 80 〇 Example 3 0.0978 〇 Example 4 0. 157 70 o Example 5 0.139 80 △ Example 6 0. 079 80 〇 Example 7 0. 085 80 〇 Example 8 0.11 1 1 80 例 Example 9 0.168 80 例 Example 10 0.172 80 Δ Example 1 1 0. 089 75 例 Example 12 0 . 086 70 〇 Table 2—2

Example Loss factor (r?) Peak value Loss factor (77) Peak temperature Applicability Example 13 0.103 70 〇 Example 14 0.102 70 〇 Example 15 0.108 65 △ Example 16 0.108 40 例 Example 17 0. 1 1 1 35 〇 Example 18 0. 1 10 35 19 Example 19 0.151 40 例 Example 20 0.171 40 △ Example 21 0. 087 25 例 Example 22 0.090 25 〇 Example 23 0.11 18 25 〇 Example 24 0.136 25 〇 Example 25 0.161 30 △ The coating properties in Table 2-1 and Table 2-2 are shown on the basis of 良好 being good, Δ being possible, and X being impossible. The glass transition point is 25 ° (: 45 ° C, 75 ° C, 78 ° C, 80 ° C) for each acrylic-styrene copolymer, and the weight-average external ratio is 61 When the above mica flakes were included, the coatability was examined in the same manner, and all were evaluated as X. From Tables 2-1 and 2-2, the glass transition point was 25-4. Use coating film components at 0 ° C, and shift to weight average ass.Mica flakes with an external ratio of 20 to 60 have a beak value of about 0.1 in all cases. Effect of the Invention The vibration-damping coating material of the present invention has a glass transition point of —20 ° (880 ° C.) Since it contains mica flakes with a weight-average aspect ratio of 20 to 60, it has excellent vibration energy absorption performance far superior to conventional vibration damping paints in the operating temperature range. It is possible to form the damping layer having.

Claims

The scope of the claims

1. A mica flake having a weight average aspect ratio of 20 to 60 is contained in a coating film component having a glass transition point of 20 to 80 ° C. Damping paint.

2. The vibration damping paint according to claim 1, wherein the mica flakes are contained in the dried coating film at a ratio of 30 to 90% by weight. 3. The vibration damping paint according to claim 1, wherein the coating film component is composed of a homopolymer of acrylate or an acryl-styrene copolymer.