# US 4,400,287 A · Heat storage material

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- Number: US 4,400,287 A
- Document ID: US4400287A
- Status: Granted
- Kind: A
- Application number: 06/343,767
- Filed: 1982-01-28
- Granted: 1983-08-23
- Earliest claimed: 1981-03-09
- Assignees: Mitsubishi Denki Kabushiki Kaisha
- Inventors: Hiroshi Kimura; Junjiro Kai
- Web page: https://patentgrep.com/patent/US4400287A

## CPC

- C09K 5/063: {Materials absorbing or liberating heat during crystallisation; Heat storage materials}
- Y10S 165/902: Heat storage
- C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS

## Abstract

A heat storage material comprises NaCH.sub.3 COO.3H.sub.2 O as a main component and a nucleating agent comprising 95 to 10 wt. % of anhydrous sodium acetate and 5 to 90 wt. % of at least one of the other sodium salts selected from the group consisting of Na.sub.3 PO.sub.4, Na.sub.2 HPO.sub.4, NaH.sub.2 PO.sub.4, NaNH.sub.4 PO.sub.4.4H.sub.2 O, Na.sub.5 P.sub.3 O.sub.10, C.sub.6 H.sub.5 Na.sub.2 PO.sub.4.2H.sub.2 O, NaBO.sub.2.2H.sub.2 O, Na.sub.2 B.sub.4 O.sub.7.10H.sub.2 O, Na.sub.2 C.sub.2 O.sub.4, NaBr, NaCl, CH.sub.2 (COONa).sub.2.H.sub.2 O, (CHCOONa).sub.2.H.sub.2 O, (CH.sub.2 COONa).sub.2.6H.sub.2 O, HOC(CH.sub.2).sub.2 (COONa).sub.2.2H.sub.2 O, CH.sub.3 (CH.sub.2).sub.2 COONa, CH.sub.3 (CH.sub.2).sub.6 COONa, HOOCCH(NH.sub.2)(CH.sub.2).sub.2 COONa.H.sub.2 O sodium oleate, and sodium stearate.

## Claims

### Claim 1

A heat storage material which comprises NaCH.sub.3 COO.3H.sub.2 O as a main component and a nucleating agent comprising 95 to 10 wt.% of anhydrous sodium acetate and 5 to 90 wt.% of at least one other sodium salt selected from the group consisting of Na.sub.3 PO.sub.4, Na.sub.2 HPO.sub.4, NaH.sub.2 PO.sub.4, NaNH.sub.4 HPO.sub.4.4H.sub.2 O, Na.sub.5 P.sub.3 O.sub.10, C.sub.6 H.sub.5 Na.sub.2.2H.sub.2 O, NaBO.sub.2.2H.sub.2 O, Na.sub.2 B.sub.4 O.sub.7.10H.sub.2 O, Na.sub.2 C.sub.2 O.sub.4, NaBr, NaCl, CH.sub.2 (COONa).sub.2.H.sub.2 O, (CHCOONa).sub.2.H.sub.2 O, (CH.sub.2 COONa).sub.2.6H.sub.2 O, HOC(CH.sub.2).sub.2 (COONa).sub.3.2H.sub.2 O, CH.sub.3 (CH.sub.2).sub.2 COONa, CH.sub.3 (CH.sub.2).sub.6 COONa, HOOCCH(NH.sub.2)(CH.sub.2).sub.2 COONa.H.sub.2 O, sodium oleate, and sodium stearate.

### Claim 2 (depends on 1)

The heat storage material according to claim 1 wherein said nucleating agent further comprises a thermoplastic organic material as a binder.

### Claim 3 (depends on 2)

The heat storage material according to claim 2 wherein said thermoplastic organic material is a natural vegetable or animal wax which has a melting point of 60.degree. C. or higher.

### Claim 4 (depends on 2)

The heat storage material according to claim 2 wherein said thermoplastic organic material is a synthetic wax.

### Claim 5 (depends on 2)

The heat storage material according to claim 2 wherein said thermoplastic organic material is a plastic resin selected from the group consisting of polyethylene, polypropylene, polystyrene, acrylic resin and polyvinyl chloride.

### Claim 6 (depends on 2)

The heat storage material according to claim 2 wherein said anhydrous sodium acetate, said other sodium salt, said thermoplastic organic material and a network structured support are bonded in one-piece by a hot-press.

### Claim 7 (depends on 6)

The heat storage material according to claim 6 wherein said network structured support is made of a plastic or a metal.

### Claim 8 (depends on 6)

The heat storage material according to claim 6 wherein said network structured support is embedded in a mixture of anhydrous sodium acetate, the other sodium salt and said thermoplastic organic material.

### Claim 9 (depends on 6)

The heat storage material according to claim 6 wherein two sheets of said network structured support are placed on both surfaces in a sandwich structure.

### Claim 10 (depends on 6)

The heat storage material according to claim 6 wherein said network structured support covers all surfaces of said molded product.

### Claim 11 (depends on 6)

The heat storage material according to claim 6, wherein the mesh of the network structured support has a diameter ranging from 50 to 5 mm.

### Claim 12 (depends on 6)

The heat storage material according to claim 6 wherein said network structured support is fibrous material dispersed in the mixture of anhydrous sodium acetate, the other sodium salt and said thermoplastic organic material.

### Claim 13 (depends on 12)

The heat storage material according to claim 12 wherein said fibrous material is at least one selected from the group consisting of metallic fiber, glass fiber, other inorganic fiber, carbon fiber and heat resistant organic fibers.

### Claim 14

A heat storage material which comprises NaCH.sub.3 COO.3H.sub.2 O having incorporated therein a molded product obtained by hot-pressing a mixture of anhydrous sodium acetate; at least one other sodium salt selected from the group consisting of Na.sub.3 PO.sub.4, Na.sub.2 HPO.sub.4, NaH.sub.2 PO.sub.4, NaNH.sub.4 HPO.sub.4.4H.sub.2 O, Na.sub.5 P.sub.3 O.sub.10, C.sub.6 H.sub.5 Na.sub.2 PO.sub.4.2H.sub.2 O, NaBO.sub.2.2H.sub.2 O, Na.sub.2 B.sub.4 O.sub.7.10H.sub.2 O, Na.sub.2 C.sub.2 O.sub.4, NaBr, NaCl, CH.sub.2 (COONa).sub.2.H.sub.2 O, (CHCOONa).sub.2.H.sub.2 O, (CH.sub.2 COONa).6H.sub.2 O, HOC(CH.sub.2).sub.2 (COONa).sub.3.2H.sub.2 O, CH.sub.3 (CH.sub.2).sub.2 COONa, CH.sub.3 (CH.sub.2).sub.6 COONa, HOOCCH(NH.sub.2)(CH.sub.2).sub.2 COONa.H.sub.2 O, sodium oleate, and sodium stearate; and a thermoplastic organic material.

### Claim 15 (depends on 14)

The heat storage material according to claim 14 wherein said thermoplastic organic material is a powder having a diameter of 1 mm or less.

### Claim 16 (depends on 14)

The heat storage material according to claim 14 wherein the pressure in said hot-pressing is 10 kg/cm.sup.2 or higher.

### Claim 17 (depends on 14)

The heat storage material according to claim 14 wherein the temperature in said hot-press is the melting point of said thermoplastic organic material or lower.

### Claim 18 (depends on 6, 14)

The heat storage material according to claim 6 or 14, wherein said NaCH.sub.3 COO.3H.sub.2 O further comprises 5 to 20 wt. % of NaHCOO.3H.sub.2 O or 5 to 15 wt. % of NaBr.2H.sub.2 O.