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The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.

The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.

Patent No.:

US 12534629 B1

PDFFull Text
Date of Patent:
Jan. 27, 2026

Filed:

Mar. 05, 2024

Spray-applied polyurethane insulation material for tunnels in cold regions, its application, and its construction method

Applicants:

China Academy of Railway Sciences Corporation Limited, Beijing, CN;

Railway Engineering Research Institute, China Academy of Railway Sciences Corporation Limited, Beijing, CN;

Inventors:

Xiaoxiong Guo, Beijing, CN;

Weibin MA, Beijing, CN;

Quanxiao Dong, Hebei, CN;

Zefu Zheng, Beijing, CN;

Peng Qiu, Hebei, CN;

Tianyuan Xu, Beijing, CN;

Chi Luo, Beijing, CN;

Cheng Qiu, Hebei, CN;

Peng Zhao, Beijing, CN;

Yao Li, Beijing, CN;

Zheli An, Beijing, CN;

Xingxu Bao, Hebei, CN;

Simeng Yan, Hebei, CN;

Xueliang Cui, Hebei, CN;

Xuehuan Hu, Hebei, CN;

Yitong Shen, Hebei, CN;

Tiantian Song, Hebei, CN;

Weihua Zhang, Hebei, CN;

Kuan Liu, Hebei, CN;

Assignees:

CHINA ACADEMY OF RAILWAY SCIENCES CORPORATION LIMITED, Beijing, CN;

RAILWAY ENGINEERING RESEARCH INSTITUTE, CHINA ACADEMY OF RAILWAY SCIENCES CORPORATION LIMITED, Beijing, CN;

Attorney:
Primary Examiner:

Carib A Oquendo

Int. Cl.
CPC ...
E21D 11/38 (2006.01); C09D 5/18 (2006.01); C09D 7/45 (2018.01); C09D 7/63 (2018.01); C09D 7/65 (2018.01); C09D 175/08 (2006.01);
U.S. Cl.
CPC ...
C09D 5/18 (2013.01); C09D 7/45 (2018.01); C09D 7/63 (2018.01); C09D 7/65 (2018.01); C09D 175/08 (2013.01); E21D 11/38 (2013.01);
Abstract

The present invention provides a spray-applied polyurethane insulation material for tunnels in cold regions, its application, and its construction method. The spray-applied polyurethane insulation material for tunnels in cold regions is composed of raw materials with a mass ratio of 0.8-1.2 of material A and material B. By mass parts, material A includes 90-100 parts of polyether polyol, 90-100 parts of polyester polyol, 5-10 parts of chain extender, 1-4 parts of catalyst, 10-20 parts of flame retardant, 0.5-3 parts of water, and 1-3 parts of surfactant. The B component is diphenylmethane diisocyanate. The flame retardant is composed of flame retardant A and flame retardant B in a mass ratio of 10:1-2.5. The spray-applied polyurethane insulation material of the present invention is used to construct tunnel structures in cold regions, providing good flame retardant and insulation effects.

Find Patent Forward Citations

Guo, Xiaoxiong. (2026). Spray-applied polyurethane insulation material for tunnels in cold regions, its application, and its construction method (U.S. Patent No. 12534629). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/12534629

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