JPH04307232A - Preparation of composite damping metal plate - Google Patents

Abstract

PURPOSE:To uniformly disperse a conductive filler in the resin of a damping steel plate. CONSTITUTION:In preparing a resin composite type damping steel plate by applying a solution type damping resin mixed with a conductive filler to two steel plates and drying the formed resin layers to laminate said steel plates, one or more kind of hydrogenated castor oil, fatty acid amide wax and polyethylene oxide is added to the resin mixed with the conductive filler.

Description

[Detailed description of the invention]

0001

[Field of Industrial Application] The present invention relates to a method for dispersing a conductive filler in a resin of a vibration-damping metal plate, and more particularly to a method for uniformly dispersing a conductive filler in a resin of a weldable resin composite vibration-damping metal plate. .

0002

[Prior Art] A weldable damping metal plate (hereinafter referred to as a "damping steel plate" as a representative of the damping metal plate) is made by containing a conductive filler in the resin of the intermediate layer. There is. In particular, as a method for dispersing a conductive filler into a solution type resin for damping steel plates, as shown in JP-A-1-145142, the resin and filler are stirred in a stirring tank, and then this mixture is applied to a metal strip using a coating roll. There is a known method of coating the surface of the metal strip, such as the method disclosed in JP-A No. 63-227331, in which resin containing metal powder is supplied from a hopper and coated on the surface of the metal strip with a coating roll via a pick-up roll. ing.

0003

[Problems to be Solved by the Invention] However, in all of these conventional techniques, when filler is dispersed in resin, the filler settles due to differences in specific gravity, etc., so it is necessary to improve the poor dispersion caused by this by physical means. However, the purpose of the present invention is to prevent the conductive filler from settling even if a conventional coater is used as is, and to enable uniform dispersion and application of the conductive filler.

0004

[Means for Solving the Problems] For this purpose, the present invention applies a solution type vibration damping resin mixed with a conductive filler to the bonding surface of at least one of two steel plates, and after drying, In a method for manufacturing a resin composite vibration damping steel plate in which two steel plates are bonded together, one or more of hydrogenated castor oil, fatty acid amide wax, and oxidized polyethylene is added to a solution type vibration damping resin mixed with a conductive filler. It is characterized by adding an anti-settling agent.

[0005]

[Function] According to the present invention, by directly mixing the anti-settling agent into the resin solution and adding the filler thereto, the sedimentation of the filler is eliminated and uniform coating can be achieved using a normal coater.

[0006]

[Example] Examples of the present invention will be explained based on experimental results. The steel plate used as the test material was a general-purpose cold-rolled steel plate (JIS, SPCC equivalent) that had undergone chromate treatment, 0.8 mm thick, and the resins were two types: polyester resin with low Tg (glass transition temperature) and acrylic resin, and anti-settling resin. There were six types of agents shown in Table 1, including Ni with an average particle size of 65 μm as a conductive filler.
Powder was used.

[0007]

[Table 1]

First, a resin is dissolved in a solvent such as methyl ethyl ketone or toluene so that the nonvolatile content becomes 25%, and the anti-settling agent shown in Table 1 is mixed and dispersed therein. If the anti-settling agent is a liquid version of oxidized polyethylene or fatty acid amide wax dispersed in xylene, it is mixed and dispersed directly into the resin solution using a disperser, while if it is a powdered version of hydrogenated castor oil or fatty acid amide wax, it is mixed and dispersed directly into the resin solution. The resin solution was blended into a heated resin solution and mixed and dispersed using a disperser. Next, add a conductive filler to this solution by volume relative to the nonvolatile content.
After adding 2%, it was applied to a steel plate using a roll coater. The resin thickness is 40 μm. The steel plates coated with the resin were dried in a drying oven at 150°C for 3 minutes, and after being bonded together using a heated roll at 200°C, various performance tests as shown in Table 2 were conducted.

[0009]

[Table 2]

The test results are shown in Table 3 for those using polyester resin as the resin, and in Table 4 for those using acrylic resin. In all cases, it can be seen that as a result of the present invention, vibration damping steel plates with uniform filler distribution and good quality were obtained.

[0011]

[Table 3]

0012

[Table 4]

[0013] In the above experiments, one or two types of organic anti-settling agents were used, but in actual operations, two or more of these types may be used in combination, or inorganic anti-settling agents such as silica and acetylene black may be used. It is also effective to further add an anti-settling agent. In addition, although only one type of steel plate and one type of conductive filler were used in the experiment, the metal plates of the present invention include general cold-rolled steel plates, various plated steel plates, surface-treated steel plates such as phosphate-treated steel plates, stainless steel, and aluminum. , metal plates such as copper can be applied. It goes without saying that metal powders such as stainless steel, zinc, tin, brass, etc. and plated fillers can also be used as conductive fillers.

[0014]

According to the present invention, the conductive filler is uniformly mixed into the resin which is the core material of the vibration damping steel sheet, and the quality of the resin composite vibration damping steel sheet can be stabilized.

Claims (2)

[Claims] Claim 1: A resin composite vibration damping method in which a solution type vibration damping resin mixed with a conductive filler is coated on at least one bonding surface of two metal plates, and after drying, these two metal plates are bonded together. A method for producing a composite vibration-damping metal plate, characterized in that one or more types of anti-settling agents are added to a solution-type vibration-damping resin mixed with a conductive filler. 2. The method for producing a composite vibration damping metal plate according to claim 1, wherein the anti-settling agent is one or more of hydrogenated castor oil, fatty acid amide wax, and oxidized polyethylene.