Surface coating incorporating phase change material

Patent metadata

Field	Value
Publication number	US-10167628-B2
Application number	US-201514963693-A
Country	US
Kind code	B2
Filing date	Dec 9, 2015
Priority date	Dec 9, 2015
Publication date	Jan 1, 2019
Grant date	Jan 1, 2019

Abstract

A stable emulsion having a fluid medium; a phase change material (PCM) comprising a straight, branched and/or cyclic aliphatic moiety having from 3 to 18 carbon atoms, polymers, and copolymers having residues of the straight, branched and/or cyclic aliphatic moiety; and a modified cyclodextrin having at least one functional moiety capable of forming a stable emulsion with the PCM in the fluid medium. The invention further includes a modified paint or surface coating having from 10 to 99 weight % of a base coating and from 1 to 90 weight % of the stable emulsion admixed therein.

First claim

What is claimed is:

1. A modified surface coating or paint comprising:
a. from about 10 to about 99 weight % of a base coating; and
b. from about 1 to about 90 weight % of a stable emulsion comprising:
i. water;
ii. a phase change material (PCM) comprising octadecane; and
iii. a modified cyclodextrin having at least one functional moiety capable of forming a stable emulsion with the PCM in said fluid medium and said base coating formulation; wherein the at least one functional moiety is an ester group;
wherein the amount of component (i) is from about 0.10 to about 0.8, the amount of component (ii) is from about 0.1 to about 0.8, and the amount of component (iii) is from about 0.03 to about 0.50, wherein the amounts are weight ratios based on the total weight of the emulsion.

2. The modified surface coating of claim 1 , wherein said PCM comprises from about 10 weight % to about 70 weight % of the emulsion, based on the total weight of the emulsion.

3. The modified surface coating of claim 1 , wherein the solid carrier is a modified cyclodextrin having a degree of substitution (DS) of from 0.3 to 3, and the ester group is selected from acetate, n-propionate, isopropionate, n-butyrate, isobutyrate and mixed functionality.

4. The modified surface coating of claim 1 , wherein the coating has from about 5 weight % to about 50 weight % of the PCM admixed into the paint formulation.

5. The modified surface coating of claim 1 , wherein the base coating is a water-based paint.

6. A coated substrate having a passive energy well for storing and releasing thermal energy comprising:
A. a first surface exposed to heat source; and
B. coated on the first surface a sufficient amount of the modified surface coating or paint composition comprising:
i. from about 10 to about 99 weight % of a base coating; and
ii. from about 1 to about 90 weight % of a stable emulsion comprising:
a. water;
b. a phase change material (PCM) comprising octadecane; and
c. a modified cyclodextrin having at least one functional moiety capable of forming a stable emulsion with the PCM in said fluid medium and said base coating formulation; wherein the at least one functional moiety is an ester group;

wherein the amount of component (i) is from about 0.10 to about 0.8, the amount of component (ii) is from about 0.1 to about 0.8, and the amount of component (iii) is from about 0.03 to about 0.50:
wherein the amounts are weight ratios based on the total weight of the emulsion, wherein said first surface can absorb/release at least about 226 Joules of energy over a surface area of 400 ft 2 in a 24 hour period when the temperature of the surroundings is ±2° of the PCM latent heat of fusion phase change temperature; and wherein said first coated surface comprises a plurality of coats of modified surface coatings, wherein a first layer comprises first modified coating having a first PCM with a first heat of fusion and a second layer comprises a second modified coating having a second PCM with a second heat of fusion, wherein the second heat of fusion is different than the first heat of fusion.

7. The coated substrate of claim 6 , wherein said base coating is a water-based paint.

8. The coated substrate of claim 6 , wherein said modified surface coating or paint composition has a weight ratio of emulsion-to-base paint of from 0.01:1 to 10:1.

9. The coated substrate of claim 6 , wherein said modified surface coating or paint composition has a weight ratio of emulsion-to-base paint of 1:1.

10. The coated substrate of claim 6 , wherein said first PCM has a heat of fusion greater than the second PCM.

11. The coated substrate of claim 6 , wherein said first PCM has a heat of fusion less than the second PCM.

Assignees

• Eastman Chem Co

Inventors

• Sidheswaran Meera Angayarkanni
• Vargantwar Pruthesh Hariharrao
• Depew Leslie Sharon
• Shields Glen Dennis
• Cogar Jennifer Lynn

Classifications

• C09K5/063 Primary

  Materials absorbing or liberating heat during crystallisation; Heat storage materials · CPC title

• C09D5/32

  Radiation-absorbing paints {(protection against X-, gamma- or corpuscular radiation G21F)} · CPC title

• C09D5/26

  Thermosensitive paints · CPC title

• C09D105/16

  Cyclodextrin; Derivatives thereof · CPC title

• E04B1/76 Primary

  specifically with respect to heat only (heat insulation in general F16L59/00) · CPC title