Granted Patent B2

US 12,221,721 · App. 17/886,740 · Granted Feb 11, 2025

Inventors: Mohammad Irfan Iqbal (Kowloon, HK); Kaixin Lin (Kowloon, HK); Hau Him Lee (New Territories, HK); Chi Yan Tso (Tsuen Wan, HK)

Assignee: City University of Hong Kong

D01D5/0038D10B2321/021

Abstract

Claims (20)

1. A method for manufacturing a radiative cooling textile, comprising the steps of:

a) providing an organic solution containing a polymer;

b) adding a metal oxide into the organic solution to form a suspension;

c) electrospinning the suspension on a substrate to form an electrospun fabric of nanofibers; and

d) performing a heat-pressing treatment to the electrospun fabric thereby subjecting nanofibers in the electrospun fabric to inter-fiber fusion and bonding;

wherein an average diameter of the nanofibers is about 0.45 μm, and the thickness of the radiative cooling textile is about 85 μm.

2. The method of claim 1 , wherein Step c) further comprises the steps:

e) feeding the suspension into a syringe; and

f) spinning the suspension by a syringe pump at a spinning voltage.

3. The method of claim 1 , wherein the spinning voltage is 25 kV.

4. The method of claim 1 , further comprises the step of drying the electrospun fabric before Step d).

5. The method of claim 1 , wherein Step a) further comprises dissolving the polymer in the organic solution, and then stirring the organic solution using a magnetic stirrer.

6. The method of claim 1 , further comprises after Step b) the step of stirring the suspension until particles of the metal oxide are evenly dispersed without obvious agglomeration.

7. The method of claim 1 , wherein the substrate is an aluminum foil.

8. The method of claim 1 , wherein in Step d) applied pressure, temperature and time are 0.14 MPa, 105° C. and 30 minutes, respectively.

9. The method of claim 1 , wherein in Step d) the heat-pressing is conducted in two sides of the electrospun fabric.

10. The method of claim 1 , wherein the metal oxide is reflective and the polymer is thermoplastic.

11. The method of claim 1 , wherein the metal oxide is zinc oxide and the polymer is polyethylene.

12. The method of claim 1 , wherein the inter-fiber fusion and bonding is induced by melting part of the polymer between the nanofibers.

13. The method of claim 1 , further comprises, before Step b) and after Step a), the step of heating the organic solution to 120°.

Assignments (1)

Continuity (1)

References Cited (62)