Radiative cooling film and product thereof

US11867434B1 · kind B1 · utility

Assignees

• NINGBO RADI-COOL ADVANCED ENERGY TECHNOLOGIES CO., LTD. · CN
• NINGBO RUILING ADVANCED ENERGY MATERIALS INSTITUTE CO., LTD. · CN

Inventors

• Shaoyu Xu · Ningbo City, CN
• Ronggui Yang · New York, US
• Song Zhong · Ningbo City, CN
• Minghui Wang · Beijing, CN
• Zhengjie YIN · Ningbo City, CN
• Huihui YANG · Ningbo City, CN
• Zhaolu Xia · Ningbo City, CN

Key dates

• Filing date: Mar 1, 2021
• Grant date: Jan 9, 2024
• Expiry date: Mar 1, 2041

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08J2475/14
• WIPO field: Surface technology, coating
• WIPO sector: Chemistry

Abstract

A radiative cooling film and a product thereof are provided. The radiative cooling film includes a carrier layer, a reflective layer and an emissive layer stacked together. A light shines on the radiative cooling film from the emissive layer. The emissive layer includes a polymer containing a C—F bond. The carrier layer includes a polymer containing at least one of a C—C bond and a C—O bond. After disposing at 120 degrees centigrade for 30 minutes, a transverse direction heat-shrinkage rate of the carrier layer is less than or equal to 2%, and a machine direction heat-shrinkage rate of the carrier layer is less than or equal to 3%. A thickness of the radiative cooling film is in a range of 50 m to 170 μm, and a thickness of the emissive layer accounts for 20% to 90% of the thickness of the radiative cooling film.