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Preparation method of oil-soluble polyurethane grouting liquid

A technology of polyurethane and grouting liquid, which is applied in the field of polyurethane grouting liquid, which can solve the problems of difficult storage, large molding shrinkage rate, and easy skinning of finished products, and achieve the effect of easy storage, small molding shrinkage rate, and difficult skinning

Active Publication Date: 2013-08-21
ZIBO DEXIN LIANBANG CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At this stage, the finished products of polyurethane grouting materials are easy to crust and difficult to store, and the molding shrinkage rate is relatively large, which affects the reinforcement performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] (1) Preparation - prepolymer with 10% NCO content:

[0019] Add polyether polyol and dibutyl phthalate into the container, raise the temperature to 120°C, dehydrate for 1 hour, cool down to 50°C, add PAPI dropwise to polyether polyol to obtain a prepolymer;

[0020] (2) When the temperature rises to 80°C, keep it warm for 2 hours;

[0021] (3) Cool down to 50°C, add xylene and catalyst to prepare oil-soluble polyurethane grouting fluid;

[0022] The polyether polyol is a mixture of a polyether polyol with a functionality of 4 and a molecular weight of 1000-1500 and a polyether polyol with a functionality of 3 and a molecular weight of 4500-5000, and the mixing mass ratio of the two is 40:60; Glycerin is used as the initiator, and the latter uses propylene glycol as the initiator, both of which are prepared by ring-opening of propylene oxide and ethylene oxide.

[0023] The catalyst is an amine tin catalyst, which is compounded with triethylenediamine and dibutyltin di...

Embodiment 2

[0025] (1) Preparation - prepolymer with 12% NCO content:

[0026] Add polyether polyol and dibutyl phthalate to the container, raise the temperature to 110°C, dehydrate for 2 hours, cool down to 50°C, add PAPI dropwise to polyether polyol to obtain a prepolymer;

[0027] (2) When the temperature rises to 80°C, keep it warm for 2 hours;

[0028] (3) Cool down to 40°C, add xylene and catalyst to prepare oil-soluble polyurethane grouting fluid;

[0029] The polyether polyol is a mixture of a polyether polyol with a functionality of 2 and a molecular weight of 2000-2500 and a polyether polyol with a functionality of 3 and a molecular weight of 3000-3500, and the mixing mass ratio of the two is 50:50; Glycerin is used as the initiator, and the latter uses propylene glycol as the initiator, both of which are prepared by ring-opening of propylene oxide and ethylene oxide.

[0030] The catalyst is an amine tin catalyst, which is compounded with triethylenediamine and dibutyltin dil...

Embodiment 3

[0032] (1) Preparation - prepolymer with 12% NCO content:

[0033] Add polyether polyol and dibutyl phthalate to the container, raise the temperature to 110°C, dehydrate for 2 hours, cool down to 50°C, add PAPI dropwise to polyether polyol to obtain a prepolymer;

[0034] (2) When the temperature rises to 80°C, keep it warm for 3 hours;

[0035] (3) Cool down to 40°C, add xylene and catalyst to prepare oil-soluble polyurethane grouting fluid;

[0036] The polyether polyol is a mixture of a polyether polyol with a functionality of 3 and a molecular weight of 1800-2000 and a polyether polyol with a functionality of 2 and a molecular weight of 4000-4500, and the mixing mass ratio of the two is 55:45; Glycerin is used as the initiator, and the latter uses propylene glycol as the initiator, both of which are prepared by ring-opening of propylene oxide and ethylene oxide.

[0037] The catalyst is an amine tin catalyst, which is compounded with triethylenediamine and dibutyltin dil...

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Abstract

The invention relates to a polyurethane grouting liquid and specifically relates to a preparation method of an oil-soluble polyurethane grouting liquid. The preparation method of the oil-soluble polyurethane grouting liquid comprises the following steps of: firstly preparing a prepolymer with the -NCO content of 9.5-17.5%, further performing heat preservation, then cooling, and adding a toluene type solvent and a catalyst so as to prepare the oil-soluble polyurethane grouting liquid. The oil-soluble polyurethane grouting liquid prepared by the method disclosed by the invention has the advantages of stability, small shrinkage rate in forming, difficulty in crust formation and easiness in storage. The method has the advantages of simplicity, convenience, quickness and effectiveness, anti-seepage and leakage stoppage effects can be realized, and a certain structure reinforcing effect can be further realized. An oil-soluble polyurethane grouting technology is particularly suitable for waterproof treatment against dynamic seepage of underground works and can be widely applied to the fields of water conservation, hydropower, tunnels, municipal administration, industrial and civil buildings and the like.

Description

technical field [0001] The invention relates to a polyurethane grouting liquid, in particular to a preparation method of an oil-soluble polyurethane grouting liquid. Background technique [0002] Polyurethane grouting material is a chemical slurry composed of polyurethane prepolymer and additives (solvent, catalyst, retarder, surfactant, plasticizer, etc.). Usually a single liquid type. Its main component is an isocyanate-terminated (NCO) prepolymer prepared by reacting excess diisocyanate (or polyisocyanate) with polyether polyol. During the grouting process, when the polyurethane grouting material is injected into a gap or a loose porous foundation, the terminal NCO group of the prepolymer contacts with the moisture in the surface of the gap or the broken substrate, and a chain extension cross-linking reaction occurs, and finally in the concrete A gel-like consolidated body with a certain strength is formed in the gaps or between the pores of the substrate particles. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/76C08G18/48C08G18/10C08K5/12
Inventor 王帅陈鹏耿佃勇荆晓东董伟
Owner ZIBO DEXIN LIANBANG CHEM IND
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