TECHNICAL FIELD

The present invention relates to a composite material steel sheet, more specifically to a composite material steel sheet having excellent shock attenuating and vibration damping characteristics.

BACKGROUND ART

Structures or materials with excellent shock attenuating and vibration damping characteristics are materials which have been studied for a long period of time in the fields of automobiles, munitions, home appliances and construction. Recently, there has been increasing demand for materials securing safety in car accidents, materials capable of effectively protecting electronic devices vulnerable to impacts and those capable of preventing the spread of noise between floors or living noise, due to rapid supply of automobiles, high performance of electronic products and a rapid increase in population density in certain regions.

As a method for securing the shock attenuating and vibration damping characteristics of the structure or material, a thickness or volume thereof may be increased; however, this may not be an economically appropriate solution due to an inevitable increase in weight. Accordingly, there is an urgent need for a structure or material for effectively securing the shock attenuating and vibration damping characteristics as well as lightweight.

(Patent Document 1) Korean Laid-Open Publication Application No. 10-2017-0067940 (Publication Date: Jun. 19, 2017)

DISCLOSURE

Technical Problem

An aspect of the present invention is to provide a composite material steel sheet having excellent shock attenuating and vibration damping characteristics.

The technical problem of the present invention is not limited to the problem mentioned above, and other problems not mentioned herein will be clearly understood by those skilled in the art from the following description.

Technical Solution

According to an aspect of the present invention, a composite material steel sheet may include at least one steel sheet and a paper-resin-impregnated composite layer, wherein the paper-resin-impregnated composite layer comprises stacked sheets of paper and a resin impregnated therein to provide adhesion to the paper in contact with each other.

The impregnated resin may be any one of an epoxy resin and a phenol resin, or a mixture thereof.

The paper-resin-impregnated composite layer may have a thickness of 10 μm to 1000 μm.

The composite material steel sheet may further include a porous foam layer.

A pore formed in the porous foam layer may have an average diameter of 1 μm to 10 μm.

The pore formed in the porous foam layer may be closed cells.

The porous foam layer may be formed by any one of a polyethylene (PE) foam, a polystyrene (PS) foam and an ethyl-vinyl acetate (EVA) foam.

The porous foam layer may have a thickness of 100 μm to 1000 μm.

The composite material steel sheet may further include an elastomer layer providing cushioning against physical impacts and vibrations.

The elastomer layer may be anyone of a urethane rubber, a silicone rubber, a butadiene rubber, an ethylene-propylene synthetic rubber and a natural rubber, or a mixture of any one or more thereof.

According to another aspect of the present invention, a composite material steel sheet may include a first steel sheet; a second steel sheet; and a paper-resin-impregnated composite layer inserted between the first and second steel sheets and comprising stacked sheets of paper with an impregnated resin.

The composite material steel sheet may further include a porous foam layer inserted between the first and second steel sheets and having one surface closely in contact with one side of the paper-resin-impregnated composite layer.

The composite material steel sheet may further include an elastomer layer inserted between the first and second steel sheets to provide cushioning against physical impacts and vibrations and having one surface closely in contact with one side of the paper-resin-impregnated composite layer.

Advantageous Effects

According to an aspect of the present invention, a composite material steel sheet is provided with a paper-resin-impregnated composite layer formed by impregnating sheets of paper with an impregnated resin, thereby effectively securing rigidity and lightweightedness of the composite material steel sheet as well as effectively dispersing physical impacts and vibrations applied thereto.

Further, a composite material steel sheet according to an aspect further includes a porous foam layer, thereby effectively securing lightweight as well as effectively suppressing spread of physical impacts and vibrations applied thereto.

In addition, according to an aspect, a composite material steel sheet further comprises an elastomer layer, thereby effectively securing rigidity as well as effectively absorbing and cushioning the physical impacts and vibrations applied thereto.

