JPS59152847A - Steel plate for absorbing vibration - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vibration-absorbing steel plate comprising a crosslinked polyolefin sheet as an intermediate layer and upper and lower layers as rolled steel plates.

In recent years, with the remarkable economic development of Japan, large quantities of steel sheets have been used, and many of their applications are closely connected to daily life, such as automobiles, vehicles, household appliances, and steel furniture. Among these, demand for automobiles has increased rapidly both domestically and internationally, reaching 10,000! The tastes of mourners are also becoming more sophisticated year by year.)
The performance requirements for materials are also increasing. Furthermore, production conditions are constantly changing due to rationalization of the automobile manufacturing process. For example, when looking at the automobile painting process, the coating temperature has increased with the change from cationic painting to anionic painting.

In the case of automobiles, it is important to reduce vibrations during driving to improve ride comfort, and in addition to improving the performance of existing vibration absorption devices, research is also being actively conducted on materials. . In the case of steel plates, the inventors considered a structure in which a synthetic resin was sandwiched in between, but many general-purpose resins have melting temperatures of 200°C or lower, and there was a problem with heat resistance in the painting process at temperatures above 200°C. There is. So-called engineering resins having a melting temperature of 200° C. or higher are expensive, have poor adhesive properties, and have very high hardness, so they have problems with their vibration absorption effects.

In order to develop an inexpensive and highly effective vibration-absorbing steel plate, the inventors of the present invention conducted intensive research on synthetic resins for the intermediate layer, and as a result, they found that crosslinked polyolefin resins were most suitable. Further testing revealed that the sila/crosslinked tyrene resin had better adhesion to steel plates than other crosslinked polyolefin resins.

The method for producing a triple-structured steel plate of the present invention is to use an electron beam irradiation crosslinking method, sandwiching and pressing a crosslinked polyolefin sheet made by a silane crosslinking method between steel plates or steel plates coated with an adhesive, or press a silane grafted polyolefin sheet. Possible methods include extrusion coating on the surface of a steel plate coated with a silanol condensation catalyst or a mixture of a silanol condensation catalyst and an adhesive. The latter is considered to be a more preferable method than the former because it is a continuous production method and the adhesive strength with the steel plate is higher than the former.

The vibration-absorbing steel plate having the crosslinked polyolefin sheet intermediate layer is a novel vibration-absorbing steel plate that does not melt even under the high temperatures of the automobile painting process.

Examples will be described below.

Example-1 0.5 mm thick high strength polyethylene sheet (high strength 0.5 mm)
954 M: 0.3 A cross-linked high-grade polyethylene sheet (glue fraction: 60%) was coated with an irradiated ray f-ji ■ (manufactured by Nippon Petrochemical Company) with an intermediate layer and one side was coated with adhesive. O-8 thick automotive steel sheet (Sumitomo Metals ■
(manufactured by) was press-bonded using a 50f press so that the adhesive-applied surface was in contact with the cross-linked high-strength polyethylene. The pressing conditions were set at a roadbed surface temperature of 180°C, and at 20Ky/i.
Pressure was applied for a minute.

Comparative Example M Instead of the crosslinked high-density polyethylene sheet of Example-1, a high-density polyethylene sheet before crosslinking was press-bonded.

When these pressed steel plates were left upright in an atmosphere of 200 to 230°C, which is the temperature of an automobile painting line, for one hour, changes were investigated, and it was found that the comparative example copper plate had a high-density polyethylene intermediate layer. has melted and eluted, whereas in the steel sheet of Example-1, the interlayer high-density cross-linking i
Polyethylene maintained its 4 content and no change was observed.

Example-2 Sila/grafted low-strength polyethylene (Mitsu1 Jianfan 924M: O, S) and silanol condensation catalyst were placed between high-strength automobile steel plates (same as Example-1) preheated to 140°C. The molten mixture was extruded at a resin temperature of 200°C and bonded through a pressure roll with a roll surface of 120°C and 80°C. This steel plate was subjected to crosslinking treatment by being left in a high-temperature, high-humidity environment with an ambient temperature of 80° C. and a relative humidity of 90° C. for a period of time. This middle class 7
The dull fraction of the run-crosslinked low VE polyethylene was 70%. When this steel plate was left standing in an ambient atmosphere at 200 to 230°C for 1 hour, the intermediate layer of the comparative steel plate tested at the same time melted and flowed out. On the other hand, no change was observed, and the adhesion to the steel plate after cooling was even stronger than before the test.

Claims (2)

[Claims] (1) A vibration-absorbing steel plate consisting of a cross-linked polyolefin sheet as an intermediate layer and upper and lower layers as rolled steel plates. (2) Claim 1 in which the crosslinked polyolefin sheet consists of a single layer or multiple layers of silane crosslinked ethylene resin
Steel plate for vibration absorption.