A polyurethane gas sealing material for underground coal mines and its preparation method

Abstract

The invention belongs to the technical field of materials, and particularly relates to a polyurethane gas hole sealing material for an underground coal mine and a preparation method thereof. The hole sealing material disclosed by the invention comprises three components A, B and C, wherein the component A is isocyanate and accounts for 35-55% of total mass of the materials; the component B is polyether polyol and auxiliary materials, and accounts for 5-55% of total mass of the materials, wherein the polyether polyol accounts for 60-84.9% of the mass of the component B, a catalyst accounts for 0.1-5% of the mass of the component B, a fire retardant accounts for 10-30% of the mass of the component B, a foam stabilizer accounts for 0-15% of the mass of the component B, a foaming agent accounts for 5-20% of the mass of the component B and a chain extender accounts for 0-10% of the mass of the component B; the component C is sodium silicate, and accounts for 10-50% of total mass of the materials. The preparation method comprises the following steps: burdening according to the ratio of the components A, B and C, and fully mixing to obtain the hole sealing material. The hole sealing material disclosed by the invention is the gas hole sealing material which is low in price, low in viscosity, large in expansion times, good in air-tightness, strong in binding power and good in flame retardant property, and the safety and the economical efficiency of gas hole sealing for the underground coal mine can be greatly improved.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to a polyurethane gas sealing material used in underground coal mines and a preparation method thereof. Background technique [0002] At present, the commonly used gas sealing materials mainly include clay sealing materials, cement mortar sealing materials and polyurethane sealing materials. Among them, the softness and hardness of clay sealing materials are not easy to control, and the sealing length is short, so the sealing effect cannot be achieved well. ; The plasticity of the cement mortar sealing material is small, it is easy to produce air leakage, the setting time is long, and the operation is complicated. The polyurethane sealing material is more and more used in the treatment of underground gas drainage due to its characteristics of large expansion, good sealing, strong cohesive force, no shrinkage, and antistatic properties. [0003] However, the cost of th...

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Problems solved by technology

[0003] However, the cost of the existing polyurethane gas sealing materials is relatively high, and the polyurethane sealing materials without flame retardants are extremely easy to burn in the environment where the medium itself has the potential for spontaneous combustion, and a large amount of harmful gases and smoke are released during the combustion process, which is harmful Human health and social safety, therefore, it is particularly important to reduce the cost of polyurethane sealing materials while improving their flame retardancy