Polyurethane-water glass composite grouting material as well as preparation method and application thereof

Abstract

The invention discloses a polyurethane-water glass composite grouting material as well as a preparation method and an application thereof. The polyurethane-water glass composite grouting material comprises a component A and a component B in a weight ratio of 1:1-1:2, wherein the component A comprises the following components in percentage by weight: 72%-83% of polyurethane prepolymer, 5%-15% of plasticizer, 5%-10% of flame retardant and 2%-3% of surfactant, and the component B comprises the following components in percentage by weight: 99.2%-99.5% of water glass and 0.5%-0.8% of antistatic agent. The obtained composite grouting material has low slurry toxicity and relatively good compressive strength, is dense in jet-grouted solid and does not foam when being wet; and the flame retardancy and the anti-static performance of the composite grouting material meets the requirements of national coal industrial standards MT113-1995; and the polyurethane-water glass composite grouting material can be used for reinforcing coal seams of coal mines.

Description

technical field [0001] The invention belongs to the field of building materials, and in particular relates to a polyurethane-water glass composite grouting material and a preparation method and application thereof. Background technique [0002] Polyurethane grouting materials were developed in Japan in the 1960s, and began to be promoted all over the world in the 1980s. At present, they are widely used in various construction, water conservancy, and mining projects. The advantages of polyurethane grouting materials are: high adhesion, good anti-seepage performance; easy to adjust the curing rate, simple construction technology and equipment; quick reaction with water, will not be lost due to groundwater erosion; Secondary pressure, so as to pour into smaller cracks; high chemical stability, good durability; strength and toughness are better than general chemical grouting materials, and can handle special cases such as expansion joints. At the same time, because there are ma...

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Problems solved by technology

However, oily polyurethane grouting materials also have some defects and deficiencies: pure polyurethane grouting materials have insufficient antistatic properties, and are prone to generate static electricity under external influences, causing catastrophic accidents such as gas explosions and fires; some oily polyurethane grouting materials contain organic solvents, In the process of grouting construction and coal production, it will catch fire when it is heated. In addition, polyurethane itself has insufficient flame retardancy, which makes the fire easy to spread, and it will produce highly toxic gas when burning, which will cause serious secondary disasters; polyurethane grouting construction When the reaction temperature is too high, the temperature can reach 120°C or even higher, and there are certain safety hazards; in addition, for coal mine production, it involves a wide range and the demand for grouting materials is large. However, the cost of polyurethane grouting materials is relatively high, and its basic raw materials (isocyanate , polyether) reached 10,000 to 20,000 per ton, while the prices of traditional inorganic grouting materials such as cement and water glass were only one-tenth or even lower. Therefore, the high cost of polyurethane grouting materials limited its own to promote

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