Heat storage material

• US 4,561,989 A
• Filed: 07/30/1984
• Issued: 12/31/1985
• Est. Priority Date: 07/30/1984
• Status: Expired due to Fees

• Current Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Original Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Inventors: Yamamoto, Ryoichi, Wada, Takahiro, Yokotani, Fumiko
• Primary Examiner(s): Lieberman, Paul
• Assistant Examiner(s): Wax, Robert A.
• Application Number:
  US06/635,578
• Time in Patent Office: 519 Days
• Field of Search: 252/70
• US Class Current: 252/70
• CPC Class Codes: C09K 5/063 Materials absorbing or liberating heat during crystallisation; Heat storage materials

Abstract

A heat storage material comprises a sodium acetate-water system containing at least 53-69% by weight sodium acetate (CH₃ CO₂ Na), wherein said heat storage material is mixed with a thickener comprising polyvinyl alcohol, paraffin and one or two components selected from the group consisting of formaldehyde and acetone, and has stable performance and little change of heat storage capacity even under repeated storage and release of heat.

Claims

1. A heat storage material comprising a sodium acetate-water system containing at least 53-69% by weight sodium acetate (CH₃ CO₂ Na), wherein said heat storage material is mixed with a thickener comprising polyvinyl alcohol, paraffin and one or two components selected from the group consisting of formaldehyde and acetone.

2. A heat storage material according to claim 1, wherein 100 parts by weight of said heat storage material comprising a sodium acetate-water system is admixed with 0.5-20 parts by weight of polyvinyl alcohol, 0.1-5 parts by weight of one or two components selected from the group consisting of formaldehyde and acetone, and with 0.1-5 parts by weight of paraffin.