JPS6071671A - Vibration-damping coating compound - Google Patents

Abstract

PURPOSE:A vibration-damping coating compound for cevering cars, ships, etc., having improved peel strength and impact resistance, preventing noise caused by vibration of steel plate, obtained by blending a resin component of an epoxy resin and urethane-modified epoxy resin with a scaly inorganic substance in a specific ratio. CONSTITUTION:(A) 100pts.wt. resin coponent of (i) 10pts.wt. epoxy resin, and (ii) 1-100pts.wt. urethane-modified epoxy resin consisting of a polyisocyanate compound (e.g., pentane diisocyanate, etc.), a polyoxy compound (e.g., ethylene glycol, etc.), and an epoxy compound (e.g., butylglycidyl ether, etc.) is blended with (B) 10-200pts.wt. scaly inorganic substance (e.g., mica, etc. having 60- 100 meshes by Tyler standard sieve), to give the desired coating compound. EFFECT:Having improved vibraion-damping performances in a wide temperature range.

Description

[Detailed description of the invention] [Industrial application field] This research is applicable to automobiles, other vehicles, agricultural machinery, construction machinery,
This invention relates to a vibration damping paint that is applied to steel plates of ships and the like to form a sheet-like coating film to prevent noise caused by vibrations of these steel plates.

[Prior art]

As this type of vibration damping materials such as paints, damping materials made of asphalt yarn and various synthetic resins to which scaly inorganic substances such as mica have been developed have been developed. However, it cannot be said that any of these damping materials necessarily exhibits sufficient damping performance in a wide temperature range, and the maximum value of the damping performance of these damping materials cannot necessarily be said to be high.

[Purpose of the invention]

The present invention was made by paying attention to such actual situation.
The main purpose is to provide a vibration damping paint that can form a sheet-like coating that exhibits sufficient vibration damping performance in a wide temperature range, and also has excellent adhesion to base materials such as steel plates and impact resistance. To provide a vibration-damping paint capable of forming a sheet-like coating film with high corrosion resistance.

[Structure of the invention]

In order to achieve such an object, the present invention provides epoxy resin 10
The resin component is 1 to 100 parts by weight of a urethane-modified epoxy resin having urethane bonds in the molecule, and the vibration damping paint has 10 to 200 parts by weight of the resin component and 10 to 200 parts by weight of a scaly inorganic substance. There is a gist.

Thus, in the present invention, the urethane-modified epoxy resin has a urethane bond in its molecule, and is obtained by adding a urethane polymer produced from a polyisocyanate compound and a polyoxy compound to an epoxy compound.

Specific examples of the polyisocyanate compound include aliphatic diisocyanates such as pentane isocyanate, hexane diisocyanate, and dipropyl ether diisocyanate, aromatic diisocyanates such as phosphorus isocyanate, phenylene diisocyanate, and biphenyl diisocyanate, and dimethyl benzoate diisocyanate.
Cycloaliphatic diisocyanates such as diisocyanate methylcyclohexane are used.

In addition, examples of polyoxy compounds include diols such as ethylene glycol, ethylene glycol/l/%), propylene glycol, etc.
Triols such as limethylolpropane, trimethylolethane, hexanetriol, glycerin, polyhydric alcohols such as polyoxyalkylene glycols such as polypropylene glycol and polybutylene glycol -) V and saturated fatty acids such as adipic acid and sebacic acid, maleic acid, phthal Borienether with unsaturated fatty acids such as acids are used.

In addition, as an epoxy compound, specifically butyl
Glycyl ether, aryl glycyl ether, bispheno+-/
Glycidyl compounds such as L/A diglycidyl ether and polyglycol diglycidyl ether/1/ are used.

Furthermore, in the present invention, mica, graphite, glass flakes, etc. are used as the Qt4 flaky inorganic substance,
As for their size, it is preferable that the particle size distribution is centered around a 60 to 1 DO mesh in terms of Tyler fIFf*.

In addition, in the present invention, the main components are the above-mentioned resin component and scaly inorganic substance, but in addition, a diluent,
It goes without saying that a curing agent or the like may be added. As the diluent, Kijiroru is suitable, and as the curing agent, polyamines, polyamidoamines, modified aliphatic polyamines, modified aromatic polyamines, etc., which are used as curing agents for epoxy resins, are suitable.

[Action/effect of the invention]

According to the present invention, as is clear from FIG. 2 and FIG. The loss coefficient η is higher than that of (a), and the epoxy resin alone (
A) and urethane-modified epoxy resin alone (S) show higher η in a wide temperature range. It can be seen that it has excellent vibration performance.

Furthermore, as is clear from Fig. 4 and Table 4, the sheet-like coating film formed with the vibration damping paint Qs~ψ) according to the present invention has high peel strength and impact resistance. On the other hand,
It can be seen that the epoxy resin alone) and the urethane-modified epoxy resin alone (+) had low values in at least one of peel strength and impact resistance.

The mixing ratio of the scale-like inorganic substance is determined within the scope of the present invention based on the applicability of the paint, the adhesion of the paint film, etc.

〔Example〕

Examples of the present invention will be described below. In this example, the loss coefficient η, which is a measure of vibration damping performance, was calculated as follows using the measuring device shown in FIG. That is, a sheet-like coating film 12 of a predetermined thickness is formed by applying various damping paints according to the present invention to the "-" side of a support plate 11 made of iron plate, and the sheet-like coating film 12 is formed between the support plate 11 and the sheet-like coating film. One end is supported on a strong surface plate. Next, both of these 11 and 12 are caused to resonate at a natural frequency by an exciter 21, and then the applied force is instantly reduced to zero to allow them to freely oscillate.The attenuation of this free oscillation is detected by a pickup 22, an amplifier 26, and a time analyzer 24. and level recorder 25
Measure the attenuation degree D (db/s) using

From this attenuation degree, the loss coefficient η was calculated using the following formula. Further, in this embodiment, η≧0.05i vibration damping effect υ. In addition, in FIG. 1, the reference numeral 26 indicates an emitter.

η=2D/(aWR) where a=20ioge-8.
68WR = 2πf, H (ffi: natural frequency) [Example 1] Epithane E195 (manufactured by Dainippon Ink & Chemicals Co., Ltd., trademark) as the urethane-modified epoxy resin, mica as the scaly inorganic substance, and Laccamite WHO51 as the hardening agent.
(manufactured by Dainippon Ink & Chemicals Co., Ltd., trademark) respectively to prepare vibration damping paints (A) to (S) with the components shown in Table 1, and these vibration damping paints (A) to (S). A sheet-like coating film 12 shown in FIG. 1 was formed to a thickness of 2 mm using the above methods, and the loss coefficient η at each of these temperatures was calculated to obtain the results shown in Table 2. These results are shown in FIGS. 2 and 6.

In each vibration damping paint (A) to (S), vibration damping paint (B) to
(The force is obtained by using the damping paint according to the present invention, (a) is the case where the resin component is only epoxy resin, and (S) is the case where the resin component is only urethane-modified epoxy resin. From these results, As can be seen, the vibration damping pigment (a) whose resin component is an epoxy resin alone has the highest value of loss coefficient η compared to the vibration damping paints (b) to (s) whose resin component is a urethane paternal epoxy resin alone or a mixture of the same resins. In addition, in these vibration damping pigments (B) to (S), the maximum value of the loss coefficient η shifts to the low temperature side in proportion to the proportion of urethane paternal epoxy resin, and when the urethane paternal epoxy resin alone The damping paint is 5
In a temperature range of 0°C or higher, sufficient vibration damping performance cannot be exhibited. Therefore, in a wide temperature range from room temperature to higher, each vibration damping paint (b) to (
g) exhibits a high loss coefficient η and exhibits sufficient vibration damping performance.

Table 1 Component ratio of each damping paint (A) to (S) (Note: All ratios of each component are parts by weight) Table 2 η (×1O) for each vibration damping paint (A) to (S) -2) [Example 2
] A damping paint with the components shown in Table 6 was prepared using Epithane F195 as a urethane-modified epoxy resin, mica as a scaly inorganic substance, and Laccamite WH036S (manufactured by Inu Nippon Ink Chemical Co., Ltd., trademark) as a hardening agent.
～(Y) All of the sheet-like coatings formed from these vibration damping paints were subjected to the impact resistance test (J Engineering 5K-5400) according to the J Engineering S standard (J Engineering 5K-5400) and the impact resistance value was determined. was measured.

The results obtained are shown in Table 4. In addition, each vibration damping paint) ~
(Y), two iron plates were pasted together, and the peel strength was measured by subjecting them to a peel strength test (J Engineering 5K-6854) according to all JIS standards. The results obtained are shown in FIG. In FIG. 4, (A) shows the proportion of urethane-modified epoxy resin, and (B) shows the proportion of epoxy resin.

For each vibration damping paint Q) ~ (Y), vibration damping paint Q → ~ ψ)
1 is a vibration damping coating according to the present invention, and 2) is a resin component consisting solely of an epoxy resin, and 2) is a resin component solely consisting of a urethane-modified epoxy resin. As can be seen from these results, the vibration damping paint 0) whose resin component is an epoxy resin alone has a higher impact resistance value than the vibration damping paint Q → ~ (Y) whose resin component is a urethane-modified epoxy resin alone or a mixture of the same resin. is extremely low. On the other hand, as for the peel strength, as the mixing ratio of the epoxy resin and the urethane-modified epoxy resin approaches the same ratio, the value increases, and the vibration damping paint using either resin alone has the lowest value. Therefore, it is each vibration damping paint Q→~ψ) according to the present invention that satisfies both impact resistance and peel strength, and each of these vibration damping paints Q→~(fJ)
It is extremely effective for use as a damping material for steel plates for automobiles, etc., which are subjected to significant vibrations, shocks, etc.

Table 6 Component ratio of each vibration damping paint

[Brief explanation of the drawing]

Figure 1 is a schematic configuration diagram of the attenuation measuring device, Figures 2 and 6 are graphs showing the relationship of η to each temperature of sheet-like coatings formed with each damping paint, and Figure 4 is a graph showing the relationship between η and each temperature. It is a graph showing the relationship between the peel strength and the component ratio of both resins in a damping paint. Explanation of symbols 11...Support plate, 12...Sheet-like coating film, 21...
・Vibrator. Applicant Toyota Tsusho Corporation

Claims (1)

[Claims] 10 parts by weight of an epoxy resin and 1 to 100 parts by weight of a urethane-modified epoxy resin having urethane bonds in the molecule'f: Resin component, with 100 parts by weight of the resin component and 10 to 200 parts by weight of a scaly inorganic substance as main components. Damping paint.