Jacketed Glass Reactor for Developing Filling and Sealing Materials

With the development of the coal mining industry, roof falling often occurs during the coal mining process. Therefore, measures such as filling and repairing the roof falling area are necessary to carry out further coal mining. At present, the filling and sealing materials used for high caving filling, upper and lower corner filling, underground roadway working faces and other head-on caving areas in coal mines are mainly phenolic resin foam materials and polyurethane resin foam materials.

Phenolic resin foam materials have issues such as high corrosiveness, irritating odor during foaming, high formaldehyde content, and crispy foam. Polyurethane resin foam materials have high reaction temperatures, and in order to meet flame retardant requirements, too many flame retardant components have been added. Many mining bureaus and coal mines have explicitly stipulated that the above two materials will no longer be used.

In view of this, in September 2015, the scientific research team of ACHIEVE CHEM laboratory, together with Shaanxi Coal Research Institute and Yan'an University, developed a high flame retardant and low temperature dual component filling material and its preparation method for coal mines. This technology is made by using the physical foaming principle to make the foaming agent generate heat in the reaction process of polyurethane material to volatilize it and then form foam. The entire process is carried out inside the 200L double layer reactor with heating circulator, and the changes in the reaction process can be observed from the glass cover.

The foaming principle of the new technology is the polyurethane foam material based on the CO2 gas generated by the internal chemical reaction of the polyurethane principle, which reduces the reaction temperature during the foaming process of the material. At the same time, without adding flame retardant, it has excellent flame retardant performance, meets the safety requirements of coal mines for filling materials at low temperature with lab heating and cooling circulator, flame retardant, and environmental protection, and reduces the hidden dangers of coal mine safety production.