Thermal storage with phosphorus compounds
A composition for thermal storage includes at least one phosphor compound and water. At least part of the phosphor compound is an oligomer. The composition can be used in a hardened material thereof, a thermal storage device, a method for storing thermal energy, and a method for obtaining the aforementioned composition solid core particles.
1. A composition for thermal storage, comprising:
a. solid core particles,
b. a shell surrounding each core particle, said shell comprising at least one shell phosphorous-containing oligomer, wherein the shell phosphorous-containing oligomer is bound to the core particles by chemisorption or physiosorption, and
c. a matrix comprising at least one matrix phosphorous-containing oligomer,
wherein the number of repeating units in the at least one shell phosphorous-containing oligomer is less than the number of repeating units in the matrix phosphorous-containing oligomer.
2. The composition according to claim 1 , having a solid content within a range from 30 to 60 wt. %.
3. The composition according to claim 1 , wherein the core particles have a median diameter within a range from 1 to 10 μm.
4. The composition according to claim 1 , wherein the core particles have a surface pretreated with a reactive species.
5. The composition according to claim 1 , wherein the at least one shell phosphorous-containing oligomer contains 3 to 50 repeating units.
6. The composition according to claim 1 , wherein a content of water of crystallization in the at least one matrix phosphorous-containing oligomer or the at least one shell phosphorous-containing oligomer is within a range of from 0 to 20 wt. %.
7. The composition according to claim 1 , wherein the composition also comprises a filler.
8. The composition according to claim 7 , wherein the filler particles have a median diameter within a range from 1 to 50 mm.
9. The composition according to claim 1 , wherein the composition is capable of flowing.
10. The composition according to claim 1 , wherein the composition is a hardened material, which comprises a hardened composition in which at least 90 wt. % of the water has been removed.
11. A thermal storage device comprising the hardened composition according to claim 10 .
12. A method for storing thermal energy, comprising delivering the thermal energy to the thermal storage device according to claim 11 by heating said thermal storage device.
13. A method for obtaining the composition according to claim 1 , comprising mixing the at least one shell phosphorous-containing oligomer with the solid core particles.
14. The composition according to claim 9 , wherein the composition is a liquid.
15. The composition according to claim 1 , wherein the ratio of the shell phosphorous-containing oligomer to the matrix phosphorous-containing oligomer is in a range from 1:10 to 1:100.
16. The composition according to claim 1 , wherein the core particles comprise a material having polar groups.
17. The composition of claim 16 , wherein a surface density of the polar groups on the core particle is at least 2.4 μmol/mm 2 .