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A polyurethane grouting material for repairing karst cave-like diseases at the bottom of roadbed

A grouting material and polyurethane technology, applied in the field of grouting materials, can solve the problems of increasing the drying shrinkage of the consolidated body, premature aging and degradation of the consolidated body, and increasing the probability of re-leakage in the project, and achieve good curing instant efficiency. , outstanding alkali resistance, improve the effect of acid and alkali corrosion resistance and engineering durability

Inactive Publication Date: 2018-06-26
ANHUI YOUTE HIGHWAY MAINTENANCE TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, there are still some problems in the mainstream products of hydrophobic polyurethane grouting materials currently used, mainly as follows: first, the reaction rate of hydrophobic grout materials is lower than that of hydrophilic products, and the immediate efficiency of water blocking is obviously low Because of the latter, at the same time, because of the high cost, it seriously affects the confidence of customers in choosing this type of material; secondly, the durability of polyurethane grouting materials depends on the strength of the consolidated body and the shrinkage rate after drying, hydrophobicity Although the slurry material will not shrink in large volume after dehydration like the hydrophilic slurry material, the inert organic solvent in the system will still increase the drying shrinkage of the consolidated body, and there is also a hidden danger of engineering re-leakage; third, The acid hydrolysis corrosion resistance of the slurry material consolidation is not good, and the consolidation body in the harsh geological environment for a long time is prone to premature aging and degradation, which increases the probability of engineering re-leakage

Method used

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  • A polyurethane grouting material for repairing karst cave-like diseases at the bottom of roadbed
  • A polyurethane grouting material for repairing karst cave-like diseases at the bottom of roadbed

Examples

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Effect test

Embodiment 1

[0020] The polyurethane grouting material used for the repair of karst caves at the bottom of the roadbed described in this embodiment, its raw materials include by weight: 60 parts of polyurethane prepolymer, 25 parts of modified phenolic resin, 1 part of organic montmorillonite, triphosphate 15 parts of (β-chloroethyl) ester, 2 parts of quaternary ammonium polyurethane antistatic agent, 30 parts of dioctyl phthalate, 2 parts of polyether modified polysiloxane, 1 part of catalyst, 10 parts of acetone ;

[0021] Wherein, the preparation method of the polyurethane prepolymer includes: adding polyether polyol, polyester polyol and soybean oil polyol into the reaction kettle, dehydrating for 2 hours under the condition of vacuum degree of -0.08MPa and temperature of 120°C, cooling To 65°C, inject nitrogen to restore normal pressure, add polyisocyanate, keep stirring under nitrogen atmosphere for 0.5h, then raise the temperature to 90°C, stir and react for 2h, after the reaction i...

Embodiment 2

[0024] The polyurethane grouting material used for the repair of karst caves at the bottom of the roadbed described in this embodiment, its raw materials include by weight: 80 parts of polyurethane prepolymer, 15 parts of modified phenolic resin, 10 parts of organic montmorillonite, triphosphate 5 parts of (β-chloroethyl) ester, 3 parts of quaternary ammonium polyurethane antistatic agent, 5 parts of dinonyl phthalate, 10 parts of polyvinylpyrrolidone, 0.05 part of catalyst, 35 parts of butanone;

[0025]Wherein, the preparation method of the polyurethane prepolymer includes: adding polyether polyol, polyester polyol and soybean oil polyol into the reaction kettle, dehydrating for 3 hours under the condition of vacuum degree of -0.1MPa and temperature of 110°C, cooling to 55°C, inject nitrogen to restore the normal pressure, add polyisocyanate, heat and stir under nitrogen atmosphere for 1 hour, then raise the temperature to 80°C, stir and react for 3 hours, after the reaction ...

Embodiment 3

[0028] The polyurethane grouting material used for repairing karst caves at the bottom of the roadbed described in this embodiment, its raw materials include by weight: 70 parts of polyurethane prepolymer, 20 parts of modified phenolic resin, 5 parts of organic montmorillonite, triphosphate 10 parts of (β-chloroethyl) ester, 2.5 parts of quaternary ammonium polyurethane antistatic agent, 17 parts of diisodecyl phthalate, 806 parts of Tween, 0.5 parts of catalyst, 22 parts of ethyl acetate;

[0029] Wherein, the preparation method of the polyurethane prepolymer comprises: adding polyether polyol, polyester polyol and soybean oil polyol into a reaction kettle, dehydrating for 2.5 hours at a vacuum degree of -0.09MPa and a temperature of 115°C, Cool down to 60°C, inject nitrogen to restore normal pressure, add polyisocyanate, heat and stir under nitrogen atmosphere for 0.7h, then raise the temperature to 85°C, stir and react for 2.5h, after the reaction is completed, cool down to ...

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Abstract

A polyurethane grouting material for repairing roadbed-bottom culvert defects comprises the following raw materials in parts by weight: 60-80 parts of a polyurethane prepolymer, 15-25 parts of modified phenolic resin, 1-10 parts of organic montmorillonite, 5-15 parts of a fire retardant, 2-3 parts of an antistatic agent, 5-30 parts of a plasticizer, 2-10 parts of a foam stabilizer, 0.05-1 part of a catalyst, and 10-35 parts of a solvent. The polyurethane grouting material for repairing roadbed-bottom culvert defects possesses good curing real-time efficiency and relatively high dimension stability, and also is excellent in mechanical properties and strong in engineering endurance.

Description

technical field [0001] The invention relates to the technical field of grouting materials, in particular to a polyurethane grouting material used for repairing karst caves at the bottom of roadbeds. Background technique [0002] The karst caves at the bottom of the subgrade are prone to form soil caves and develop into collapses due to the seasonal changes of groundwater level, latent erosion, vacuum suction, etc., or the roof of the karst caves will collapse due to the increase of loads due to new construction loads and other reasons. At present, the main measure to treat karst caves is grouting, and the selection of grouting materials is the basic problem of grouting engineering, and it is the most important factor to ensure that the grouting technology can achieve the expected purpose, and it is the key to reducing project cost and saving cost. [0003] Modern grouting materials are mainly divided into granular materials, chemical materials and composite materials compose...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L75/04C08L61/14C08K13/02C08K3/34C08K5/521C08G18/66C08G18/36
CPCC08G18/36C08G18/6629C08L75/04C08L2201/02C08L2205/03C08L2205/035C08L61/14C08K13/02C08K3/346C08K5/521
Inventor 王辉
Owner ANHUI YOUTE HIGHWAY MAINTENANCE TECH CO LTD
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