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Environmentally friendly low-viscosity high-strength polyurethane grouting lifting material and preparation method thereof

An environmentally friendly, grouting lifting technology, applied in the field of lightweight grouting lifting materials and their preparation, can solve the problems of accelerated physical foaming agent escape, foam structure damage, repair point collapse, etc., to achieve low cost and high cost. Compression strength, easy storage effect

Active Publication Date: 2018-05-18
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during the application of ordinary polyurethane grouting lifting materials, due to the insufficient strength of the material itself, the repair point is prone to collapse again
The main reasons are as follows: First, due to the structural characteristics of polyurethane rigid foam, its own strength is much smaller than that of consolidated bodies; second, ordinary polyurethane grouting lifting materials mostly use low-boiling physical foaming During the grouting process, the polyurethane reacts to generate a large amount of reaction heat, which will accelerate the escape of the physical foaming agent, resulting in the destruction of the foam structure and the decrease in strength.

Method used

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  • Environmentally friendly low-viscosity high-strength polyurethane grouting lifting material and preparation method thereof
  • Environmentally friendly low-viscosity high-strength polyurethane grouting lifting material and preparation method thereof
  • Environmentally friendly low-viscosity high-strength polyurethane grouting lifting material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] 1. At room temperature, weigh 90 parts of polyether polyol 460 (functionality 3.2, number average molecular weight 550, viscosity 250-450mPa·s), 10 parts of polyether polyol 4110 (functionality 4, number average molecular weight 500, Viscosity 2500-4500mPa·s) is placed in a dried reactor to obtain a composite polyether polyol.

[0042] 2. Add 40 parts of low-viscosity epoxy resin compound (30 parts of epoxy resin E-44 and 10 parts of reactive diluent neopentyl glycol diglycidyl ether) into the dried reaction kettle and compound polyether polyol Mix well, then add 1.0 parts of 2,4,6-tris(dimethylaminomethyl)phenol, 4 parts of foam stabilizer AK-8805, 3 parts of deionized water and 10 parts of dimethyl methylphosphonate in sequence, and stir Disperse evenly to obtain component A.

[0043] 3. Weigh 110 parts of polyisocyanate PAPI and 0.5 part of T12, stir and disperse evenly to obtain component B.

[0044] 4. Mix component A and component B at a volume ratio of 1:1, foa...

Embodiment 2

[0049] 1. At room temperature, weigh 90 parts of polyether polyol 460 (functionality 3.2, number average molecular weight 550, viscosity 250-450mPa·s), 10 parts of polyether polyol 4110 (functionality 4, number average molecular weight 500, Viscosity 2500-4500mPa·s) is placed in a dried reactor to obtain a composite polyether polyol.

[0050]2. Add 40 parts of low-viscosity epoxy resin compound (30 parts of epoxy resin E-51 and 10 parts of reactive diluent neopentyl glycol diglycidyl ether) into the dried reaction kettle and compound polyether polyol Mix well, then add 1.0 parts of 2,4,6-tris(dimethylaminomethyl)phenol, 4 parts of foam stabilizer AK-8805, 3 parts of deionized water and 10 parts of dimethyl methylphosphonate in sequence, and stir Disperse evenly to obtain component A.

[0051] 3. Weigh 110 parts of polyisocyanate PAPI and 0.5 part of T12, stir and disperse evenly to obtain component B.

[0052] 4. Mix component A and component B at a volume ratio of 1:1, foam...

Embodiment 3

[0057] 1. At room temperature, weigh 70 parts of polyether polyol 460 (functionality 3.2, number average molecular weight 550, viscosity 250-450mPa·s), 30 parts of polyether polyol 4110 (functionality 4, number average molecular weight 500, Viscosity 2500-4500mPa·s) is placed in a dried reactor to obtain a composite polyether polyol.

[0058] 2. Add 50 parts of low-viscosity epoxy resin compound (35 parts of epoxy resin E-44 and 15 parts of reactive diluent neopentyl glycol diglycidyl ether) into the dried reaction kettle and compound polyether polyol Mix well, then add 1.5 parts of 2,4,6-tris(dimethylaminomethyl)phenol, 4 parts of foam stabilizer AK-8805, 3 parts of deionized water and 10 parts of dimethyl methylphosphonate in sequence, and stir Disperse evenly to obtain component A.

[0059] 3. Weigh 115 parts of polyisocyanate PAPI and 0.5 part of T12, stir and disperse evenly to obtain component B.

[0060] 4. Mix component A and component B at a volume ratio of 1:1, foa...

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Abstract

The invention discloses an environment-friendly low-viscosity high-strength polyurethane grouting lifting material and a preparation method thereof. The environment-friendly low-viscosity high-strength polyurethane grouting lifting material consists of a component A and a component B, wherein the component A mainly comprises composite polyether polyol, a low-viscosity epoxy resin compound, an amine catalyst, a foam stabilizing agent, water and a flame retardant; the component B mainly comprises an organic tin catalyst, polyisocyanate and the like. The ozone depletion potential of the environment-friendly low-viscosity high-strength polyurethane grouting lifting material disclosed by the invention is 0, the environment-friendly low-viscosity high-strength polyurethane grouting lifting material is clean and environment-friendly, and meanwhile has the characteristics of relatively low slurry viscosity, good flowbility, good groutability and the like, the rise time of the material can be controlled within 10-30 seconds, the foaming time of the material can be adjusted within 60-120 seconds, the foam appearance core density of the material can be within 50-80 kg / m<3>, the foams are uniform and dense, and the compression strength of the material is 0.45-0.70 MPa. Meanwhile as foams, rock and soil are all relatively good in adhesion property, the material is applicable to lifting mediation of buildings, traffic roads and projects under different geological conditions.

Description

1. Technical field [0001] The invention relates to a lightweight grouting lifting material with high mechanical strength and excellent comprehensive performance and a preparation method thereof, in particular to an environment-friendly low-viscosity and high-strength polyurethane grouting lifting material and a preparation method thereof. 2. Background technology [0002] Polyurethane grouting lifting material is a rigid foam with certain strength and lifting effect formed after grouting and foaming, which can be used for foundation lifting and repairing. At present, it has been gradually applied in the field of construction and transportation, providing a guarantee for the rapid repair and safety of buildings and road surfaces. However, during the application of ordinary polyurethane grouting lifting materials, due to the insufficient strength of the material itself, the repair point is prone to collapse again. The main reasons are as follows: First, due to the structural ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/40C08G18/48C08G18/58C08J9/08
CPCC08G18/4045C08G18/4816C08G18/58C08G2110/0083
Inventor 丁运生陈丁丁范仁祥王海利蔡明孙晓红刘志
Owner HEFEI UNIV OF TECH
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