Polyurethane reinforcing and filling materials for coal mine

Abstract

The invention relates to a polyurethane reinforcing and filling materials for coal mines. A component A is a polymethylene polyphenyl isocyanate, a component B is obtained via the follow steps: mixing and stirring the following ingredients: 33 to 70 wt% of polyether polyol, 0 to 40 wt% of polyester polyol, 0.1 to 1.5 wt% of composite catalyst, 6 to 30 wt% of composite flame retardant, 0 to 15 wt%of foaming agent, 0.5 to 2.5 wt% of stabilizer, 0.5 to 10 wt% of foam stabilizing agent, 0.1 to 5 wt% of antistatic agent , 5 to 25 wt% of plasticizer at 30 DEG C to 50 DEG C for 0.5 to 2 hrs; and when in use, the component A and the component B are together pressed into a coal (rock) layer according to the mass ratio of 1 to 2 : 1, penetrate into tiny cracks and expand, meanwhile react and generate CO2 gas and further expand, thereby effectively reinforcing and sealing processing areas. The compressive strength of polyurethane reinforcing and filling materials for coal mines is more than 55 MPa, the bond strength is more than or equal to 4 MPa, the foaming factor is less than or equal to two times. The invention can meet the need of coal mine safe production, and can be used for hydropower, construction, mining, transportation and other industries.

Description

technical field [0001] The invention relates to a material used for bonding, reinforcing and filling coal (rock) bodies in coal mines and related industries, and more specifically relates to a polyurethane reinforcing and filling material. Background technique [0002] Under the action of mine pressure, roadway cofferdams, roofs, working faces, etc., especially loose coal (rock) bodies are very easy to collapse, which brings hidden dangers to production safety. Especially with the popularization of large-scale fully mechanized mining equipment, it is necessary to maintain the mining roadway, chamber, working face and roof during the coal mining process. [0003] Grouting technology has been widely used in various geotechnical engineering since the 1950s. Grouting materials are divided into cement and chemical materials, which are used for different types of projects. In the 1970s, countries with advanced coal mining technologies such as Germany, the United States, the Comm...

AI Technical Summary

Problems solved by technology

[0009] 5. Although there are fissures formed in the underground broken coal and rock mass due to the original or mining impact, the width of the fissures is small, so it is difficult to use inorganic reinforcement materials

[0012] Coal mines in my country usually use methods such as erecting wooden stacks and filling mortar at the site of the fall, but these methods are time-consuming, laborious, and difficult to construct, and cannot guarantee that the hidden dangers of accidents will be eliminated.