High-strength geopolymer hollow microsphere, preparation method thereof and phase change energy storage microsphere

Patent metadata

Field	Value
Publication number	US-2020002210-A1
Application number	US-201816485450-A
Country	US
Kind code	A1
Filing date	May 25, 2018
Priority date	Jun 21, 2017
Publication date	Jan 2, 2020
Grant date	—

Abstract

A high-strength geopolymer hollow microsphere, a preparation method thereof and a phase change energy storage microsphere are provided, including: dissolving sodium hydroxide, sodium silicate and spheroidizing aid in water to form a solution A, and adding active powder to the solution A, stirring and uniformly mixing to form a slurry B, adding the slurry B to an oil phase, stirring and dispersing into balls, filtering to obtain geopolymer microspheres I, washing the geopolymer microspheres I, and then carrying out a high-temperature calcination to obtain the high-strength geopolymer hollow microspheres II; using the high-strength geopolymer hollow microsphere as a carrier, absorbing a phase change material into the carrier, and mixing a microsphere carrying the phase change material with an epoxy resin, adding a powder dispersant and stirring to disperse the microsphere, after the epoxy resin is solidified, screening the superfluous powder dispersant to obtain the phase energy storage microsphere.

First claim

What is claimed is:

1 . A method of preparing high-strength geopolymer hollow microspheres, comprising: dissolving sodium hydroxide (NaOH), sodium silicate (Na 2 SiO 3 .9H 2 O) and a spheroidizing aid in water to form a solution, adding active powder to the solution to obtain a first mixture, stirring and uniformly mixing the first mixture to form a slurry, adding the slurry to an oil phase dispersion medium to obtain a second mixture, stirring the second mixture to disperse the slurry into the oil phase dispersion medium to form balls, after the stirring, filtering the second mixture to obtain geopolymer microspheres, washing the geopolymer microspheres, and then carrying out a high-temperature calcination on the geopolymer microspheres to obtain the high-strength geopolymer hollow microspheres; wherein a mass percentage of the sodium hydroxide (NaOH), the sodium silicate (Na 2 SiO 3 .9H 2 O) and the spheroidizing aid is (10-40%):(20-60%):(20-60%), a mass ratio of the water to the active powder is 1:2-1, the slurry accounts for 5%-50% of a volume of the oil phase dispersion medium, a temperature of the high-temperature calcination is 800-1500° C., and a time of the high-temperature calcination is 1-8 hours.

2 . The method of preparing the high-strength geopolymer hollow microspheres of claim 1 , wherein the mass percentage of the sodium hydroxide (NaOH), the sodium silicate (Na 2 SiO 3 .9H 2 O) and the spheroidizing aid is (12-20%):(40-60%):(30-50%), the mass ratio of the water to the active powder is 1:1.5-1, and the slurry B accounts for 10%-40% of the volume of the oil phase dispersion medium.

3 . The method of preparing the high-strength geopolymer hollow microspheres of claim 1 , wherein the temperature of the high-temperature calcination is 850-1200° C., and the time of the high-temperature calcination is 1-2 hours.

4 . The method of preparing the high-strength geopolymer hollow microspheres of claim 1 , wherein the spheroidizing aid is a sodium salt and a potassium salt.

5 . The method of preparing the high-strength geopolymer hollow microspheres of claim 4 , wherein the sodium salt comprises one or more selected from the group consisting of sodium carbonate, sodium chloride, sodium nitrate, and sodium sulfate; and the potassium salt comprises one or more selected from the group consisting of potassium chloride, potassium carbonate, and potassium sulfate.

6 . The method of preparing the high-strength geopolymer hollow microspheres of claim 1 , wherein the active powder comprises one or more selected from the group consisting of fly ash, metakaolin and slag, and the active powder has a mesh number of 500-1000 mesh.

7 . The method of preparing the high-strength geopolymer hollow microspheres of claim 1 , wherein the oil phase dispersion medium is a corn oil, a soybean oil, a peanut oil, a kerosene, a castor oil, or a rapeseed oil.

8 . The method of preparing the high-strength geopolymer hollow microspheres of claim 1 , wherein a temperature of the oil phase dispersion medium is 50-90° C.

9 . The method of preparing the high-strength geopolymer hollow microspheres of claim 1 , wherein a stirring speed of dispersing the slurry into the oil phase dispersion medium is 400-1000 r/min, and a stirring time is 0.5-3 hours.

10 . A high-strength geopolymer hollow microsphere prepared by the method of preparing the high-strength geopolymer hollow microspheres of claim 1 .

11 . (canceled)

12 . A method of preparing a phase change energy storage microsphere, comprising: using the high-strength geopolymer hollow microsphere of claim 10 as a carrier, absorbing a phase change material into a hollow of the carrier by a vacuum suction, and mixing a microsphere carrying the phase change material with an epoxy resin to make the epoxy resin coat on a surface of the microsphere carrying the phase change material, adding a powder dispersant and stirring to disperse the microsphere carrying the phase change material, after the epoxy resin is solidified, screening a superfluous powder dispersant to obtain the phase energy storage microsphere.

13 . The method of preparing the phase change energy storage microsphere of claim 12 , wherein the phase change material is paraffin wax having a carbon number of 18-30.

14 . The method of preparing the phase change energy storage microsphere of claim 12 , wherein an addition amount of the phase change material is 10%-20% of a mass of the high-strength geopolymer hollow microsphere, and an addition amount of the epoxy resin is 5%-15% of the mass of the high-strength geopolymer hollow microsphere.

15 . The method of preparing the phase change energy storage microsphere of claim 12 , wherein the epoxy resin is an ambient cured waterborne epoxy resin or an ambient cured oily epoxy resin.

16 . The method of preparing the phase change energy storage microsphere of claim 12 , wherein a component of the powder dispersant is one or more selected from the group consisting of ultrafine calcium carbonate, silicon powder, metakaolin, graphite powder and ultrafine slag.

17 . The method of preparing the phase change energy storage microsphere of claim 12 , wherein the powder dispersant has a particle size of 1000-2000 mesh.

18 . The method of preparing the phase change energy storage microsphere of claim 12 , wherein a stirring speed of dispersing the microsphere carrying the phase change material in the powder dispersant is 100-500 r/min, and a stirring time is 0.5-2 hours.

19 . The high-strength geopolymer hollow microsphere of claim 10 , wherein the mass percentage of the sodium hydroxide (NaOH), the sodium silicate (Na 2 SiO 3 .9H 2 O) and the spheroidizing aid is (12-20%):(40-60%):(30-50%), the mass ratio of the water to the active powder is 1:1.5-1, and the slurry B accounts for 10%-40% of the volume of the oil phase dispersion medium.

20 . The high-strength geopolymer hollow microsphere of claim 10 , wherein the temperature of the high-temperature calcination is 850-1200° C., and the time of the high-temperature calcination is 1-2 hours.

21 . The high-strength geopolymer hollow microsphere of claim 10 , wherein the spheroidizing aid is a sodium salt and a potassium salt.

Assignees

• Univ China Petroleum East China

Inventors

• Liu Huajie
• Bu Yuhuan
• Ma Rui
• Guo Shenglai
• An Longlong

Classifications

• C04B28/006

  containing mineral polymers, e.g. geopolymers of the Davidovits type · CPC title

• C04B2103/0071

  Phase-change materials, e.g. latent heat storage materials used in concrete compositions · CPC title

• C04B2111/28

  Fire resistance, i.e. materials resistant to accidental fires or high temperatures · CPC title

• C04B20/0036

  Microsized or nanosized · CPC title

• C04B20/1037

  obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds · CPC title