High-strength low-heat-release mining flame-retardant grouting reinforcement material and preparation method thereof

A grouting reinforcement, low heat release technology, applied in the field of coal and rock mass reinforcement, can solve the problems affecting normal production operations, changes in coal physical and chemical properties, and high maximum reaction temperature, and achieve improved strength, good fluidity, and low initial viscosity. Effect

Active Publication Date: 2013-07-31
ANHUI UNIVERSITY +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the solidification time of polyurethane grouting materials can be adjusted, compared with other organic grouting materials, it has great advantages in adhesive performance and compressive strength, but its isocyanate reacts violently with water under the aquifer and foams violently. As a result, the strength of the consolidated body is low, t

Method used

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  • High-strength low-heat-release mining flame-retardant grouting reinforcement material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0039] Example 1:

[0040] 1) Preparation of isocyanate prepolymer: Put 28 parts by mass of polyether polyol N303 into the reactor, heat up to 110-120°C, and dehydrate for 2 hours under a vacuum of 5mmHg to obtain dehydrated polyether polyol N303 ; Cool down to 60°C, release the vacuum, add 690 parts by mass of polymethylene polyphenyl polyisocyanate Wannate PM-2025 to the dehydrated polyether polyol N303, react at 50-70°C for 1-1.5 hours, stop The prepolymerization reaction obtains the isocyanate prepolymer.

[0041] 2) Preparation of Mixture A: Combine 63 parts by mass of isocyanate prepolymer, 35 parts by mass of flame retardant tris(β-chloroethyl) phosphate, and 2 parts by mass of antistatic agent catafor PU in step 1) Put it into the reaction kettle and stir for half an hour to discharge, the stirring speed is 150-250r / min, to obtain the mixture A, which is ready for use.

[0042] 3) Preparation of Mixture B: Add 40 parts by mass of polyether polyol N303, 15 parts by mass of 2...

Example Embodiment

[0045] Example 2:

[0046] 1) Preparation of isocyanate prepolymer: Add 28 parts by mass of polyether polyol N204 into the reactor, heat up to 110-120°C, and dehydrate for 2 hours under a vacuum of 5mmHg to obtain dehydrated polyether polyol; 60°C, release the vacuum, add 287 parts by mass of polymethylene polyphenyl polyisocyanate Wannate PM-2025 to the dehydrated polyether polyol N204, and react at 50-70°C for 1.5 hours to stop the prepolymerization reaction to obtain isocyanate Prepolymer.

[0047] 2) Preparation of Mixture A: Put 70 parts by mass of isocyanate prepolymer, 28 parts by mass of flame retardant tris(β-chloroethyl) phosphate and 2 parts by mass of antistatic agent catafor PU in step 1) Stir in the reaction kettle for half an hour and discharge, with a stirring speed of 150-250r / min, to obtain mixture A, which is ready for use.

[0048] 3) Preparation of Mixture B: Add 40 parts by mass of polyether polyol N303, 25 parts by mass of 2130 phenolic resin, and 10 parts by...

Example Embodiment

[0051] Example 3:

[0052] 1) Preparation of isocyanate prepolymer: add 40 parts by mass of polyether polyol N204 into the reactor, heat up to 110-120°C, and dehydrate for 2 hours under a vacuum of 5mmHg to obtain dehydrated polyether polyol; lower the temperature to 60 ℃, release the vacuum, add 327 parts by mass of polymethylene polyphenyl polyisocyanate Wannate PM-2025 to the dehydrated polyether polyol N204, and react at 50-70℃ for 1.5 hours to stop the prepolymerization reaction to obtain the isocyanate prepolymer Aggregate.

[0053] 2) Preparation of mixture A: Take 68 parts by mass of isocyanate prepolymer in step 1, 30 parts by mass of flame retardant tris(β-chloroethyl) phosphate, and 2 parts by mass of antistatic agent catafor PU into Stir in the reaction kettle for half an hour and discharge at a stirring speed of 150-250r / min to obtain mixture A, which is ready for use.

[0054] 2) Preparation of mixture B: 40 parts by mass of polyether polyol N303, 20 parts by mass of ...

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Abstract

The invention discloses a high-strength low-heat-release mining flame-retardant grouting reinforcement material and a preparation method thereof. The flame-retardant grouting reinforcement material is obtained through mixing and solidifying a component A and a component B which are two low-viscosity liquids, the component A is obtained through mixing 60-80 parts of an isocyanate prepolymer, 10-38 parts of a flame retardant and 2-3 parts of an antistatic agent, and the component B is obtained through mixing 30-40 parts of polyether polyol, 0.1-0.5 parts of a catalyst, 10-25 parts of a diluting agent, 10-30 parts of an epoxy resin and 10-25 parts of a phenolic resin. The flame-retardant grouting reinforcement material has a low reaction heat release during solidification and has a highest reaction temperature of below 110DEG C, the obtained reinforcement has a high strength and a good caking property with coal rocks, the bonding strength, the sand consolidating strength and the compressive strength of the material are not below 30MPa, not below 8MPa and not below 60MPa, and the grouting reinforcement material has an obviously higher flame retardation property than a simple polyurethane grouting material.

Description

1. Technical field [0001] The invention relates to a high-strength and low-exothermic flame-retardant grouting reinforcement material for mines and a preparation method thereof, which is particularly suitable for reinforcement of coal and rock masses under thick loose aquifers. 2. Background technology [0002] There is a layer of loose aquifer composed of non-cemented sandy soil and glutenite at the bottom of the Quaternary thick topsoil layer in many coal mines in East China, North China and other mining areas. On the interface, the second is high water pressure. Affected by the combined effect of mining mine pressure and high water pressure, coal mining face is prone to disaster-causing accidents such as frame crushing and water inrush. At present, the coal mine industry mainly adopts chemical grouting reinforcement technology, which uses air pressure to inject chemical grouting materials evenly into the coal and rock mass with cracks. The slurry cements the coal and roc...

Claims

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Application Information

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IPC IPC(8): C08L75/08C08L63/00C08L63/02C08L61/06C08G18/48C08G18/10C08G18/58C08G18/54C08G59/22C08K5/521
Inventor 夏茹唐永志李彬朱述文陈鹏钱家盛程桦荣传新杨斌苗继斌苏丽芬
Owner ANHUI UNIVERSITY
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