JPH06220356A - Coating composition for vibration-proof coating film - Google Patents

Abstract

PURPOSE:To obtain the coating composition used for the steel plates of automobiles, good in adhesivity and driability in comparison with conventional compositions, capable of being coated into lightweight and thick coating films, and useful for vibration-proof coating films. CONSTITUTION:This coating composition comprises (A) a vehicle comprising at least one of asphalt, a rubber and a synthetic resin and (B) a powdery material containing a hydraulic inorganic filler in an amount of 20-200 pts.wt. per 100 pts.wt. of the vehicle of component A in an (A):(B) weight ratio of 1:0.5 to 3.0. The powdery material preferably contains a syntactic foam (the mixture of the syntactic foam with the powder of a synthetic resin may be used) in an amount of 5-100 pts.wt. per 100 pts.wt. of the vehicle of component A. The vehicle of component A comprises preferably (a) asphalt and (b) at least a kind of the rubber and the synthetic resin in a (a):(b) weight ratio of 1:0-10.0.

Description

Detailed Description of the Invention

[0001]

INDUSTRIAL APPLICABILITY The present invention is used for a base material such as a steel plate for automobiles, washing machines, refrigerators, and various other devices, and other metal plates, and has a higher adhesiveness and dryness than conventional ones. The present invention relates to an antivibration coating film coating composition that has good properties, is lightweight, and can be applied to thick films.

[0002]

2. Description of the Related Art Conventionally, as one of anti-vibration measures for automobile interiors, a bituminous substance such as asphalt mixed with a filler such as calcium carbonate and asbestos is used as a sheet-like member having a thickness of about 2 to 5 mm. Installation on the floor,
The method of heat fusion is adopted. However, with this method, it is difficult to cover the entire surface such as a floor that normally takes a complicated shape, and further, partial adhesion failure occurs at a location where heat fusion does not occur, and sufficient vibration isolation cannot be obtained. It has construction difficulties.

As one of the other measures against vibrations which does not have such a difficulty, there is a method of applying a vibration-proof coating film paint. The anti-vibration material used in this method has sufficient fluidity at the time of painting to improve work efficiency by automating the construction line, and has good workability such as no sagging even in thick coating of about 5 mm. Is needed. In addition, it is also necessary that the adhesiveness to a substrate such as a steel plate is good under severe vibration and impact, the drying property is excellent, the weight is light, and the vibration-proofing property is equal to or higher than that of the sheet-like material. .

In order to meet such demands, a vibration-proof coating material having a characteristic filler (for example, JP-A-55-5826).
No. 2, etc.), workability, adhesion by the present inventors,
An anti-vibration coating having excellent anti-vibration properties (Japanese Patent Laid-Open No. 227966/1987) has been proposed.

[0005]

However, the conventional anti-vibration coating composition as described above is still insufficient in terms of workability, drying property, adhesion and the like. Specifically, since the coating film is formed from the surface, when the water-based paint is applied thickly, the coating film may have defects such as swelling, cracking, and falling off. Further, it is desired to develop a material which has a low specific gravity and can be applied to a wide range of drying temperatures, which can meet the recent needs for weight reduction and energy saving.

The inventors of the present invention have been made in consideration of the above points, and are different in workability from conventional vibration-damping materials that depend on weight and use high-density fillers such as metal powder. It is an object of the present invention to provide a coating film coating composition which satisfies the above requirements and adhesion, is lightweight, has excellent vibration damping properties, and can be applied to a wide range of drying temperatures.

[0007]

Means for Solving the Problems The inventors of the present invention have conducted extensive studies to achieve the above object, and as a result, as a result of the development, a hydraulic inorganic filler or the filler and syntactic foam (partly In the coating composition containing a mixture of a powder containing a powder of a synthetic resin powder) and a ratio of the color-developing material to the powder, or the asphalt to the rubber and the synthetic resin in the color-developing material. By adjusting the ratio to a specific range, it is possible to obtain a coating composition that is excellent in workability, adhesion, and vibration damping properties, is lightweight, can be applied to a wide range of drying temperatures, and forms a good coating film. Heading out, the present invention has been completed.

That is, the anti-vibration coating film coating composition of the present invention comprises (A) a color-developing material made of at least one of asphalt, rubber and synthetic resin, and (B) a hydraulic inorganic filler.
20 to 200 with respect to 100 parts by weight of the color-developing material of the component (A)
And a weight ratio of the powder of the component (A) to the powder of the component (B) is 1: 0.5 to 3.0. In addition, the powder of the component (B) described above is syntactic foam, and the color developing material 1 of the component (A) 1
5 to 100 parts by weight may be included with respect to 00 parts by weight. Further, the syntactic foam may be a mixture of syntactic foam and synthetic resin powder. The color-developing material as the component (A) includes (a) asphalt, (b) at least one of rubber and synthetic resin,
And the weight ratio of the component (a) and the component (b) is 1:
It is particularly preferably 0.1 to 10.0.

Examples of the color-developing material constituting the component (A) of the coating composition of the present invention include petroleum asphalt, asphalt such as natural asphalt, butadiene rubber, isoprene rubber, styrene-butadiene rubber, chloroprene rubber, Rubber such as butadiene-acrylonitrile rubber, alkyd resin, epoxy resin, acrylic resin, melamine resin, urethane resin, vinyl resin, acrylic copolymer resin, styrene-vinyl acetate copolymer resin, other vinyl acetate Examples include synthetic resins such as copolymer resins, resin derivatives thereof, and blends of these resins. However, from the viewpoint of water resistance and chemical resistance, those mainly containing asphalt are preferable.

The above-mentioned color-developing material is used by dissolving it in a solvent such as aromatic hydrocarbon-based, petroleum-based hydrocarbon, alcohol-based and ester, or by dispersing or emulsifying in water. Generally, an aqueous system is preferable.

On the other hand, among the powders constituting the component (B) of the coating film coating composition of the present invention, examples of hydraulic inorganic fillers include air-crushed slag, cement, gypsum and lime. However, from the viewpoints of anti-vibration property, coating workability, economical efficiency, etc., it is preferable to mainly use the air-crushed slag. In this case, the mixing ratio of the air-crushed slag may be about 80% by weight or more of the total amount of the total hydraulic inorganic filler (that is, the air-crushed slag and the other hydraulic inorganic fillers described above). preferable.

The above-mentioned air-crushed slag is obtained by air-crushing slag by-produced from a smelting furnace such as a converter or a blast furnace.
For example, calcium oxide 40% by weight, silicic acid 33% by weight, aluminum oxide 17% by weight, magnesium oxide 6
It is composed of weight% and iron oxide. The crushed slag itself has no or no hydraulic property. However, in the case of the crushed slag, in the presence of calcium hydroxide, alkali salts, etc., the network structure that constitutes the glassy structure of the slag is cut, the components are dissolved, and CaO—SiO ₂ —H
_It has a property that a ₂ O-based hydration product is generated to set and harden. This property is called latent hydraulic property. The latent hydraulic property of the crushed slag is very weak and does not impair the fluidity of the coating composition. The addition of a small amount of a stimulant such as cement not only prevents the coating film from sagging during further coating, but also has the effect of accelerating the drying speed of the coating composition. Further, the air-crushed slag has an appropriate density and exhibits excellent vibration damping properties.

Further, the syntactic foam which can be contained in the powder constituting the component (B) of the coating film coating composition of the present invention has hollow microspheres in which a plastic matrix (in the present invention, the above-mentioned spread color It refers to the material). As the hollow microspheres, specifically, glass balloons, shirasu balloons, synthetic resin balloons, etc. are used, and the characteristics thereof are not particularly limited, but in general,
Bulk density is 0.1 to 0.3 g / cm ³ and diameter is 10.
Approximately 300 μm, but for reasons such as easy availability,
used.

Further, in the present invention, a part of the syntactic foam can be replaced with synthetic resin powder. As the synthetic resin powder in this case, alkyd resin,
Epoxy resin, silicone resin, phenol resin, polyester resin, acrylic resin, acetal resin, polyethylene resin, polyether resin, polycarbonate resin,
Thermosetting resin powder or thermoplastic resin powder such as polysulfone resin, polystyrene resin, chlorinated polyethylene, chlorinated polypropylene, vinyl acetate resin, vinyl chloride resin, chlorinated vinyl chloride resin, vinylidene chloride resin, fluororesin, polypropylene resin, etc. Ethylene-vinyl acetate copolymer resin, other copolymer resin powders of these, blended powders of these resins, further powder paint recovery products, resin powder generated in the polishing process of resin moldings, resin waste is crushed It is possible to use the one that has been made.

When a part of the syntactic foam is replaced with the above synthetic resin powder, the mixing ratio of the syntactic foam and the synthetic resin powder is about 1 / 0.5 to 1 / (synthetic foam / synthetic resin powder). It is preferably 3 (capacity part).

The above hydraulic inorganic filler and synthetic resin powder each have a particle size of about 300 by any known method.
It is used by adjusting the thickness to less than or equal to μm, preferably about 150 μm or less. That is, the particle size of these fillers is about 300 μm.
If it becomes larger, not only it becomes difficult to obtain a predetermined vibration damping property, but also the storage stability and workability of the coating composition are impaired, which is not preferable.

A color-developing material which is the above-mentioned component (A), and (B)
The weight ratio of the component (A) component to the component (B) is 1: 0.5 to 3.0, preferably 1 :.
It is important to set it to 0.5 to 2.5. The reason for this is
If the component (B) is less than 0.5 weight ratio, sufficient vibration damping performance cannot be expected, and if it exceeds 3.0 weight ratio,
Not only is it easy for cracks to occur on the coating surface,
This is because there is a problem in sprayability.

Further, in the coating film coating composition of the present invention, in the mixing ratio of the above-mentioned component (A) and component (B),
The weight ratio of the asphalt, which is the component (a), and at least one of the rubber, which is the component (b), and the synthetic resin for the color-developing material that constitutes the component (A) is (a) :( b). 1: 0.1
Suitably a mixture of ˜10.0, preferably 1: 0.1 to 3.0. The reason for this is as follows.
Originally, the color-developing material may be any one of asphalt, rubber, and synthetic resin. Asphalt, which is the component (a), has poor fluidity and poor sprayability, but forms a surface film when heated and dried. On the other hand, the component (b), rubber and synthetic resin, are excellent in fluidity, but they sometimes form a surface film during heating and drying, which may cause blistering. Therefore, when the components (a) and (b) are individually used as the color-developing material, it may be difficult to achieve the intended object of the present invention due to the drawbacks of these two components. On the other hand, when both components (a) and (b) are mixed to form a color-developing material, the defects of each component are compensated by the other component, and the sprayability is excellent, and at the same time, in a wide drying temperature range. The composition is suitable for use. And
In the mixture of both components (a) and (b), if the component (b) is less than 0.1 weight ratio, the coating film surface is dried when a thick film coating having a film thickness of more than 100 mm is performed. In advance, it causes blistering and the like, and when it exceeds 10.0 weight ratio, the fluidity is lowered, and workability such as storage stability and sprayability becomes a problem.

Further, the above-mentioned component (A) and component (B),
Further, the mixing ratio of the component (a) and the component (b) is appropriately adjusted depending on the drying conditions, but when drying is performed at a relatively high temperature, it is more preferably adjusted as follows.

Under a drying condition of a wind speed of 3 m / sec, (1) 100 to 150 ° C. (B) / (A) = 1.0 to 3.0, preferably 1.0 to 2.5 (b) / (a ) = 1.0 to 10.0, preferably 1.0 to 3.0 (2) 150 to 180 ° C. (B) / (A) = 1.5 to 3.0, preferably 1.5 to 2. 5 (b) / (a) = 2.0 to 10.0, preferably 2.0 to 3.0

Under a drying condition where the wind speed is faster than the above, the rate of film formation on the surface of the coating film is further increased. Therefore, in order to obtain a good coating film, the ratio (A) / (B) should be lowered or (a) /
(B) Adjustment such as increasing the ratio is possible.

In this way, by adjusting the amount of the component (A) (resin component) per unit area of the coating film, thick film coating can be performed without impairing various performances of the coating film, and at the time of drying. It is also possible to control the coating film formation.

The amount of water in the coating film can be adjusted as well.
It helps to achieve these goals. That is,
If the amount of water in the coating film is too large, it causes sagging during drying, and if it is too small, workability is impaired. However, the suitable range of water content largely varies depending on the drying conditions or the types and blending ratios of the respective components used, so it is difficult to determine unconditionally, but in the present invention, the water content is generally about 15 It is preferably about 40% by weight.

In the coating composition of the present invention,
Substituting a part of the syntactic foam with a synthetic resin powder is particularly effective when the composition of the present invention is applied to a steel plate or the like and heated and dried. That is, in the case of room temperature drying, since the dry coating film is densely finished, it is not necessary to mix a high density filler such as a hydraulic inorganic filler, whereas in the case of heat drying, a hydraulic inorganic filler is used. If the content of the material is reduced, not only the film thickness increases during heating and the vibration damping performance is deteriorated, but also when the film thickness reaches several mm, the surface may be lifted or swelled during heating. The problem that occurs when heat-drying or when heat-drying to increase the film thickness when reducing the content of such a hydraulic inorganic filler is substituted with a synthetic resin powder as a part of the syntactic foam. By blending
The reason is not clear, but it can be effectively prevented.

The above synthetic resin powder may contain a pigment so that the coating composition of the present invention can be colored. Specific examples of this pigment include inorganic pigments such as titanium oxide, cadmium sulfide, iron oxide and chromium oxide, and organic pigments such as copper phthalocyanine blue and condensed polyamizo yellow.

The coating composition of the present invention contains calcium carbonate, in order to adjust the uniformity, anti-vibration property, heat insulating property, etc. of the coating film depending on the application and purpose of the coating film. Calcium silicate (talc), silica sand, clay, kiln ash, red iron oxide, asbestos, mica, pumice, suspended slag, vermiculite, natural asphalt (exist as powder depending on the drying temperature), etc. As a filler, it can be blended in the component (B). Furthermore, if necessary,
Ordinary viscosity modifiers, antifreezing agents, film-forming aids such as glycol ethers, or organic fibers such as vinylon fibers, polyethylene fibers, plastic fibers, cellulose fibers for preventing cracks and adjusting fluidity, Other fillers can be blended in the component (B). It is suitable that the blending amount of these other fillers is 10 to 150 parts by weight with respect to 100 parts by weight of the color developing material which is the component (A). Therefore, the total amount of the component (B) in the coating film coating composition of the present invention including these other fillers should be a ratio with the component (A).

The coating film coating composition of the present invention comprising the above components is formed into a coating material by adding an organic solvent, preferably a solvent such as water, and stirring and mixing. In this case, all the formulations and the solvent may be mixed at once, or the color-developing material is dissolved in the solvent in advance, and the hydraulic inorganic filler, syntactic foam, and other ingredients are added thereto, It can also be mixed by stirring to form a paint.

The coating film coating composition of the present invention thus formed into a coating material has a volatile matter content (here, a component that evaporates when kept at 105 ° C. for 3 hours) content of about 1 before drying.
It is preferably set to 5 to 40 wt%. If this amount is too small, it becomes solid and it becomes difficult to make it into a paint. On the other hand, if it is too large, the coating film sags and the work of forming the coating film becomes difficult.

The coating composition of the present invention has a viscosity of about 10,000 to 150,000 when it is made into a paint.
0cp (20 ° C, rotation speed 3rpm), specific gravity (15 ° C / 4
It is desirable to have a property of about 0.5 to 1.5. With such properties, it is possible to apply a desired film thickness to a substrate such as a steel plate of an automobile by a known arbitrary means such as a pressure spray or an air spray, and a thick film can be applied freely. It can be carried out.

Then, for example, on a substrate such as a steel plate, a thick film having a thickness of about 0.5 to 10 mm, preferably about 1 to 5 mm is applied, and the temperature is room temperature to 180 ° C., preferably about 110 to 1.
A good coating film can be obtained in a short time by heating and drying at 70 ° C., and this coating film has excellent vibration damping properties. However, when the coating composition of the present invention is an emulsion type, the drying temperature at this time is about 100 to 120 ° C. due to latent heat of evaporation of water under a high temperature atmosphere of less than about 180 ° C. Since a high temperature can be maintained, a good coating film can be obtained, but when the drying temperature is higher than 180 ° C, the film formation on the surface of the coating film becomes dominant, and the coating film expands due to the expansion of trapped water. Membrane blister,
This is not preferable because it tends to cause cracks.

[0031]

【Example】

Examples 1 to 5 The color-developing material as the component (A) and the hydraulic inorganic filler, syntactic foam, and other fillers as the component (B) were blended in the proportions shown in Table 1 to prepare a mixture. The coating composition of the invention was prepared. In addition, Example 3 and Example 4 used the thing of the same composition. In each example, water was used as the color-developing material.
After emulsifying by adding 0 part by weight, a predetermined amount of the color-developing material, hydraulic inorganic filler, syntactic foam, and other fillers were added, and the mixture was stirred and kneaded. Further, a predetermined amount of an antifreezing agent, a viscosity adjusting agent, An anti-sagging agent was added to obtain a coating film coating composition.
Note that Examples 1 and 2 have compositions for low-temperature drying at 100 ° C. or less, and Examples 3 to 5 have 130 to 180.
The composition was for high temperature drying at ℃.

Comparative Examples 1 to 4 The color-developing material as the component (A) and the hydraulic inorganic filler, syntactic foam and other fillers as the component (B) were mixed in the proportions shown in Table 2. Thus, a comparative coating composition was prepared. It should be noted that Comparative Example 1 and Comparative Example 3, and Comparative Example 2 and Comparative Example 4 had the same composition. The preparation method was the same as in Examples 1-5.

[0033]

[Table 1]

[0034]

[Table 2]

With respect to the coating film coating compositions having the compositions shown in Tables 1 and 2 (hereinafter sometimes referred to as "sample"), workability, drying property, coating film surface property, adhesion, logarithmic decrement (proof The vibration performance) was tested in the following manner, and the results are shown in Table 3 and Table 4.
Shown in.

(1) Workability: Automotive standard JASO M
The test was carried out in accordance with 306-70, and those which could be applied smoothly by an airless spray gun and which had no runoff of the coating film were regarded as acceptable. (2) Adhesion: Electrodeposited steel plate (0.8 × 70 × 15
0 mm) and apply the sample at the temperature shown in Table 3 and Table 4 to 30
After drying for a minute, a test piece was prepared such that the film thickness after drying was 1.0 mm. As a result of the appearance observation, swelling on the coating film surface,
Make sure that the steel plate is not cracked and adheres evenly to the steel plate, and according to JIS K 5400 6.15,
A first-eye test was conducted. (3) Logarithmic Decay Rate: Steel plate (0.8 x 25 x
The sample was applied to 200 mm), dried at the optimum drying temperature shown in Table 3 and Table 30 for 30 minutes, and adjusted to have a film thickness after drying of 2.5 mm, which was used as a test piece. This test piece was set in a central vibration type vibration device, and the logarithmic attenuation rate was measured by the attenuation waveform after vibration. (4) Dryability test: Electrodeposited steel plate (0.8 × 70 ×
The sample was applied to the film thickness shown in Tables 3 and 4 in 150 mm) and dried in a drying furnace (average air velocity 3 m / sec, ventilation flow from bottom to top) under the conditions shown in Table 3 and Table 30. It was dried for a minute. When the coating film comes off during drying and the appearance is observed after drying, the coating film surface that has no blisters or cracks and that is evenly adhered to the steel sheet is regarded as acceptable, and the upper limit drying temperature and optimum drying temperature range are judged. It was used as a standard.

[0037]

[Table 3]

[0038]

[Table 4]

As is clear from Tables 3 and 4, Table 1
The coating film coating composition of the present invention having the composition shown in Table 1 is superior in workability and adhesion to the comparative coating film coating composition having the composition shown in Table 2 and is excellent in vibration damping property even if it is made lightweight. It can be seen that it is effective and can be applied to a wide range of drying temperatures.

[0040]

As described above in detail, according to the coating composition of the present invention, the adhesion to a steel sheet of automobiles is better than that of the conventional coating composition, and the thick film is formed. Not only can it be applied, it is also excellent in workability and can be applied to a wide range of dry humidity. In addition, it has excellent vibration damping performance and can meet recent needs for weight reduction, and can be easily applied to steel plates of automobiles, etc., especially where vibration damping measures are required. It has extremely high intellectual value.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takashi Izumi 1134-2 Gongendo, Satte City, Saitama Cosmo Research Institute Co., Ltd.

Claims (4)

[Claims] 1. A color-developing material 100 of component (A) comprising (A) a color-developing material made of at least one of asphalt, rubber and synthetic resin, and (B) a hydraulic inorganic filler.
The powder comprises 20 to 200 parts by weight with respect to parts by weight, and the weight ratio of the (A) component spreading material to the (B) component powder is 1: 0.5 to 3.0. An anti-vibration coating film coating composition characterized by the above. 2. The powder of component (B) comprises syntactic foam in an amount of 5 parts by weight per 100 parts by weight of the color-developing material of component (A).
The anti-vibration coating composition according to claim 1, wherein the anti-vibration coating composition comprises 100 to 100 parts by weight. 3. The antivibration coating film coating composition according to claim 2, wherein the syntactic foam in the powder of component (B) is a mixture of syntactic foam and synthetic resin powder. . 4. The component (A) as a color-developing material comprises (a) asphalt and (b) rubber and at least one kind of synthetic resin, and the weight ratio of the component (a) and the component (b). Is 1: 0.1-1
It is 0.0, The antivibration coating film coating composition of Claims 1-3 characterized by the above-mentioned.