A mine plugging wind phenol urea-formaldehyde foaming resin, composite foam and preparation method thereof

Abstract

The invention provides a mine plugging phenol urea-formaldehyde foaming resin, the raw materials of which include phenol, urea, and paraformaldehyde, and the molar ratio of the three is phenol:urea:paraformaldehyde=1:0.5:3. The invention also provides a method for preparing the mine-used leak-stopping composite foam by using the phenol urea-formaldehyde foaming resin. The invention synthesizes a low-cost foaming resin, screens a suitable catalytic system, and modifies it through polyethylene glycol, glass fiber and nano-clay, so that the foam material has high foaming ratio and low production cost; antistatic , good flame retardancy and thermal stability; the foaming speed can be adjusted during mine filling, suitable for long-distance transportation; it has high elasticity and compressive strength, and strong adhesion; The effect is good, it is very suitable for plugging air leaks in coal mines, and can effectively prevent coal spontaneous combustion, gas accumulation and other problems.

Description

technical field [0001] The invention relates to the fields of coal mine safety and chemical industry, in particular to a mine plugging wind phenol urea-formaldehyde foaming resin, composite foam and a preparation method thereof. Background technique [0002] In the past ten years, with the introduction of foreign polymer foam production technology and the research and development of domestic foam materials, organic solidified foam plugging technology has been widely used in the field of coal mine safety in my country. At present, the main products of organic solidified foam plugging wind include Rockshine, Malisan, and Agroni, etc. The main application scope includes: filling of various waste lanes, old chambers, coal holes, and cavities; sealing of air leakage channels and goafs, etc. Although there are many organic curing foam products at home and abroad, they are mainly divided into three types according to their chemical composition: polyurethane foam, phenolic foam and...

AI Technical Summary

Problems solved by technology

Among them, the advantages of polyurethane foam include: its good flexibility can withstand stratum movement, shock resistance and compression resistance, no cracking or falling off after curing; good dimensional stability of the foam, no gaps after filling; excellent adhesion ability, and stratum It can form a strong adhesive force; the cells of the foam are closed-cell structure, and the sealing effect is good; but it also has disadvantages: polyurethane is flammable and will burn in case of fire; burning produces a lot of toxic smoke; the foaming reaction is violent, More heat release, high foaming temperature; high production cost

The advantages of phenolic foam are: flame retardant, low smoke, high temperature disparity resistance; uniform closed cell structure, low thermal conductivity, good thermal insulation performance; strong weather resistance, good dimensional stability, and can be used at 140°C-160°C Long-term use; the main disadvantages of phenolic foam: the foam is brittle, fragile, and powder-dropping; a large amount of carcinogenic wastewater that is difficult to degrade is produced in the production process; urea-formaldehyde foam is added to urea-formaldehyde resin with surfactants, hardeners and foaming agents, etc. Auxiliary, polymer foam prepared by mechanical stirring or chemical foaming

The advantages of urea-formaldehyde foam are: light weight, high expansion multiple, no heat transfer; low production cost, half of the cost of phenolic foam; non-combustible, high safety factor; obvious effect on preventing gas accumulation such as gas, sealing cracks and preventing air leakage The exothermic temperature of the reaction is low; the disadvantages of urea-formaldehyde foam are: the strength of the foam is low, the pressure bearing capacity is weak; the irritating gas is released during the reaction process, which pollutes the working environment

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