Patent ID: 11959379
Assignee: ANHUI UNIVERSITY OF SCIENCE AND TECHNOLOGY
Field: Civil engineering (Other fields)
Classification: CPC E  C | IPC C  E

Claim 4:
5. The method for measuring the gas pressure of the close-distance seam group simultaneously according to claim 1, wherein in steps (2), (3) and (4), the polyurethane blocking material comprises the following raw materials in parts by weight: 20-30 parts of polyether polyol, 10-15 parts of castor oil polyol, 10-15 parts of dimethyl methyl phosphonate, 1.5-2.5 parts of dimethylolpropionic acid, 1.5-2.5 parts of phosphate diol OP550, 0.5-0.85 parts of dibutyltin dilaurate and 55-65 parts of methylene diphenyl diisocyanate.