JPH0527769B2 - - Google Patents

Description

[Detailed Description of the Invention] A. Industrial Field of Application The present invention relates to a method for damping a steel plate surface, and more specifically to a damping method that exhibits excellent shape retention and especially excellent damping performance on vertical surfaces. Regarding processing method.

B. Conventional technology Conventionally, when applying vibration damping treatment to the vertical surface of a vehicle steel plate, for example, a damping sheet coated with a pressure-sensitive adhesive is pressed onto the steel plate surface, temporarily bonded, and then fused through a baking process. A sheet with a lath net or the like inserted into it to give it shape retention properties was used.

C. Problems to be solved by the invention However, according to this method, in the former case, it is not possible to satisfactorily prevent the damping sheet from slipping down;
The latter method has the disadvantage of complicating the production process, and there is currently a strong desire for a vibration damping treatment method with excellent workability and damping performance.

D Means for solving the problem In view of the current situation, as a result of intensive research, the present inventors applied paint to one side of a pre-formed vibration damping sheet to form a hard coating, and changed the shape of the vibration damping sheet. At the same time, the hardened coating acts as a restraining layer, and acts as a damping material for the sandwich structure of steel plate surface/damping sheet/coating.
Even in the above-mentioned high temperature range, we have found an improvement in damping performance that is double that of the conventional one, and we have also created a spot seat on the vibration damping sheet to enable spot welding to the steel plate surface, allowing temporary fixing by spot welding to the steel plate surface. Afterwards, the inventors discovered that the above-mentioned drawbacks could be solved by a method of heat fusing, leading to the completion of the present invention. After that, it is molded using a mold, etc., paint is applied to one side of the damping sheet to maintain the shape of the damping sheet, and a metal spot seat is added before the process of spot welding the damping sheet to the steel plate surface. A vibration damping treatment method for a steel plate surface, in which the necessary number of damping sheets are installed, then spot welded to the steel plate surface so that the painted surface of the damping sheet does not touch, and then the steel plate surface and the vibration damping sheet are fused through a baking process. Exists.

E Effect: By curing the paint applied to one side of the molded damping sheet, the shape of the damping sheet is maintained, and temporary fixing using spot seats prevents the damping sheet from slipping on the vertical surface of the steel plate to which it is applied. In addition, the coating coated and cured on one side of the vibration damping sheet functions as a restraining layer for the damping material of the sandwich structure, and can also contribute to excellent vibration damping properties.

F Structure The vibration damping sheet according to the present invention is a sheet-like material mainly composed of a rubber component, a synthetic resin component, a bituminous component, or a mixture of these components, and the rubber component includes natural rubber and polybutadiene. , styrene-butadiene rubber, butyl rubber, neoprene rubber, chloroprene rubber, and other synthetic rubbers may be selectively used. Further, the use of recycled rubber is preferable from the viewpoint of cost.

As the synthetic resin component, it is preferable to use one or more of petroleum resins, polyethylene resins, polypropylene resins, and ethylene-vinyl acetate copolymer resins.

The bituminous material may be any asphalt, and may be one or two of straight asphalt, blown asphalt, semi-brown asphalt, etc.
It may be a mixture of more than one species. Generally, they are straight asphalt alone, blown asphalt alone, or a mixture of straight asphalt and blown asphalt.

The inorganic filler contained as the other main component may be in the form of powders such as talc, clay, and calcium carbonate, in the form of fibers such as asbestos and slag wool, in the form of flakes such as mica and mica, and in the form of hollow spheres such as silica balloons. It is preferable to use one or a mixture of two or more of the materials normally used as inorganic fillers. When organic fillers are used together, synthetic resin powder, synthetic fiber waste, etc. are used.

The mixing ratio of one or more types of rubber, etc. and filler is 50 to 250 parts by weight of one or more types of rubber, etc.
Parts by weight are preferred; if it is less than 50 parts by weight, construction performance may deteriorate due to sagging during heat fusion, and if it exceeds 250 parts by weight, it may be difficult to adapt to areas with unevenness, resulting in a decrease in vibration damping effect. This is inappropriate.

The manufacturing process of the vibration damping sheet includes, for example, a process of mixing one or more heat-molten rubbers and fillers in a heating kneader, extruding the mixture, and then rolling the mixture.

The damping sheet may also contain additives such as plasticizers, stabilizers, flame retardants, etc. as appropriate.

This damping sheet is first cut into the shape of the application site. In that case, the uneven shape of the application site is also taken into consideration, and trimming is performed using, for example, a cutting die having a desired shape with a trim blade.

For molding using a mold or the like, first, a damping sheet is placed on a lower mold, and the upper mold is lowered to perform molding. It is preferable to cut and mold the damping sheet at the same time, for example, to use a mold having a trim blade in either the upper mold or the lower mold, since this improves workability by reducing the number of steps.

As for the paint to be applied to the vibration damping sheet, it is preferable that the hardness of the cured film is higher than that of the vibration damping sheet, as a hardened coating exhibits a better effect as a restraining layer for the sanderch structure. Urethane resin-based or epoxy resin-based paints are recommended.

The paint can be applied to the damping sheet using a spray gun, a brush, a roll coater, or a flow coater.

The spot seat may be attached to the vibration damping sheet mechanically in correspondence with the part to be welded on the steel plate surface. It is preferable that the spot seat is made of metal and has a shape that is fixed and integrated with the vibration damping sheet.

When applying a damping sheet to a steel plate surface, the spot bottom surface should be in contact with the steel plate surface, and the paint-applied surface should be the surface, and as long as these conditions are followed, the desired effect can be obtained.

As a method for integrating the vibration damping sheet of the present invention onto the steel plate surface, first, the spot seats of the vibration damping sheet and the steel plate surface are temporarily fixed by spot welding, and then 80~
An example of a method is to fuse and integrate the steel plate surface by baking at 180°C for 10 to 60 minutes.

Examples are given below to provide a more detailed understanding of the present invention. Naturally, the present invention is not limited to the following examples.

Example: 40 parts by weight of asphalt consisting of 40% by weight of straight asphalt and 60% by weight of blown asphalt, 10 parts by weight of recycled rubber, 10 parts by weight of asbestos, and 40 parts by weight of calcium carbonate were kneaded and rolled into a 3.0 m/
A damping sheet with a thickness of m was obtained.

An epoxy resin paint was applied to one side of the damping sheet by spraying.

Test contents and results Example vibration damping sheet a and vibration damping sheet alone b
The loss coefficient at temperatures above 40°C was measured. In general, it is said that a loss coefficient of 0.04 or more is effective.

40℃ 60℃ 80℃ a 0.16 0.12 0.08 b 0.10 0.03 0.013 As described above, according to the vibration damping treatment method for a steel plate surface according to the present invention, it has good workability, excellent shape retention, and particularly excellent control on vertical surfaces. It has become clear that it is possible to manifest vibrational behavior.

Claims (1)

[Claims] 1. After cutting the damping sheet into an appropriate shape, mold it using a mold, etc., apply paint to one side of the damping sheet to maintain the shape of the damping sheet, and then spot weld the damping sheet to the steel plate surface. Attach the required number of metal spot seats before the process, then spot-weld the damping sheet to the steel plate surface so that the painted surface does not touch, and then fuse the steel plate surface and the damping sheet in a baking process. A vibration damping treatment method for a steel plate surface, which is characterized by: