Lightweight composite metal sheet having excellent vibration damping characteristics, and manufacturing method therefor
The present invention relates to a lightweight composite metal sheet having excellent vibration damping characteristics and a method of manufacturing the same. Provided is a composite metal sheet including: a metal sheet; and a plastic layer disposed on one surface or both surfaces of the metal sheet and including a polyolefin and a thermoplastic polyester polyether elastomer.
1. A composite metal sheet comprising:
a metal sheet; and
a plastic layer disposed on one surface or both surfaces of the metal sheet and comprising a polyolefin and a thermoplastic polyester polyether elastomer,
wherein the metal sheet is a steel sheet,
wherein the thermoplastic polyester polyether elastomer is prepared from a raw material composition comprising 20 wt % to 90 wt % of a polymer of dimethylene terephthalate and 1,4-butanediol and 10 wt % to 80 wt % of a polymer of dimethylene terephthalate and tetramethylene ether glycol, and
wherein the plastic layer comprises 20 wt % to 80 wt % of the polyolefin sod 20 wt % to 80 wt % of the thermoplastic polyester polyether elastomer.
2. The composite metal sheet of claim 1 , wherein the metal sheet has a thickness of 0.2 mm to 1.2 mm.
3. The composite metal sheet of claim 1 , wherein the polyolefin is polypropylene.
4. The composite metal sheet of claim 1 , wherein the plastic layer has a thickness of 0.3 mm to 1.0 mm.
5. The composite metal sheet of claim 1 , wherein the metal sheet and the plastic layer are bonded to each other by thermal compression without a separate adhesive layer.
6. The composite metal sheet of claim 1 , wherein the composite metal sheet has a vibration at a primary natural frequency of 40 dB to 85 dB and a vibration at a secondary natural frequency of 40 dB to 64 dB.
7. The composite metal sheet of claim 1 , wherein the composite metal sheet has a shear strength of 1000 N to 3000 N.
8. The method of manufacturing a composite metal sheet of claim 1 , the method comprising:
preparing a metal sheet;
forming a plastic layer comprising a polyolefin and a thermoplastic polyester polyether elastomer; and
bonding the metal sheet and the plastic layer by thermal compression.
9. The method of claim 8 , wherein the thermal compression is performed at a temperature ranging from 170° C. to 240° C. and a pressure ranging from 60 kgf/cm 2 to 150 kgf/cm 2 .