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Chemic grouting polyurethane material, prepolymer thereof and preparation method

A technology for polyurethane chemistry and grouting materials, applied in the field of polyurethane chemical grouting materials and their prepolymers, can solve the problems of unsatisfactory bond strength, tensile strength, anti-permeability and water-inclusion performance, high toxicity and volatility of isocyanates, etc. , to achieve the effect of high compressive strength and cost reduction

Inactive Publication Date: 2011-05-25
SHANGHAI DONGDA CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to overcome the unsatisfactory properties of the existing polyurethane chemical grouting materials made by toluene diisocyanate, such as bond strength, tensile strength, anti-permeability and water content, and the used isocyanate has Due to the defects of greater toxicity and volatility, a polyurethane chemical grouting material and its preparation method and use are provided

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] The preparation method of the prepolymer: mix 0.688 parts of polyether polyol 480, 0.076 parts of polyether DL1000D and 0.00002 parts of phosphoric acid, replace the air with nitrogen for 3 times, control the temperature of the reaction kettle at 50 ° C, and add 0.236 parts of MDI-50 in a sealed manner. Then replace the air with nitrogen for 3 times, react at 50°C for 2 hours under normal pressure, and then react at 85°C for 3 hours to obtain a prepolymer;

[0040] The preparation method of polyurethane chemical grouting material: under anhydrous conditions, cool 1 part of the above-mentioned prepolymer to room temperature, add 0.25 part of anhydrous acetone, 0.08 part of anhydrous dioctyl phthalate, and 0.01 part of DMDEE, and Tween 80 0.01 part, stirred for 20 minutes to obtain polyurethane chemical grouting material, in which -NCO content was 4.4%, the specific parameters are shown in Table 1.

[0041] Table 1

[0042] project

[0043] Tensile str...

Embodiment 2

[0045] The preparation method of the prepolymer: mix 0.663 parts of polyether 480, 0.074 parts of polyether DL1000D and 0.00002 parts of tartaric acid, replace the air with nitrogen for 3 times, control the temperature of the reaction kettle at 60 ° C, add 0.236 parts of MDI-50 in a sealed manner, and then use Replace the air with nitrogen for 3 times, react at 60°C for 2 hours under normal pressure, and then react at 80°C for 3 hours to obtain a prepolymer;

[0046] The preparation method of polyurethane chemical grouting material: under anhydrous conditions, cool down 0.973 parts of the prepolymer to room temperature, add 0.20 parts of anhydrous methyl ethyl ketone, 0.05 parts of anhydrous triphenyl phosphate, 0.012 parts of DMDEE, and Tween 60 0.01 part, stirred for 20 minutes to obtain polyurethane chemical grouting material, in which -NCO content was 5.5%, and the specific parameters were shown in Table 2.

[0047] Table 2

[0048] project

Embodiment 3

[0050] The preparation method of the prepolymer: mix 0.686 parts of polyether 480, 0.036 parts of polyether DL1000D and 0.00002 parts of phosphoric acid, replace the air with nitrogen for 3 times, control the temperature of the reaction kettle at 50 °C, add 0.278 parts of MDI-50 in a sealed manner, and then use Replace the air with nitrogen for 3 times, react at 50°C for 3 hours under normal pressure, and then react at 90°C for 2 hours to obtain a prepolymer;

[0051] The preparation method of polyurethane chemical grouting material: under anhydrous condition, cool 1 part of the prepolymer to room temperature, add 0.20 part of anhydrous acetone, 0.08 part of anhydrous dioctyl phthalate, 0.015 part of DMDEE and Tween 80 0.01 part, stirred for 20 minutes to obtain polyurethane chemical grouting material, in which -NCO content was 6.0%, and the specific parameters were shown in Table 3.

[0052] table 3

[0053] project

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Abstract

The invention discloses a preparation method of a prepolymer of a chemic grouting polyurethane material. The method comprises the following steps of: mixing polyether, retarder and an isocyanate compound under anaerobic and anhydrous conditions, reacting at 50-60 DEG C for 2-3 h and reacting at 80-90 DEG C for 2-3 h to obtain the prepolymer, wherein the polyether comprises polyether 480 and polyether DL1000D, and the isocyanate compound is one or more of polymer MDI, liquid MDI and MDI-50. The invention also provides the prepolymer prepared by using the preparation method as well as a chemic grouting polyurethane material and a preparation method thereof. The chemic grouting polyurethane material is synthesized by adopting cheaper raw materials and a chemic grouting polyurethane material with better molecular weight distribution is prepared by phased full reaction of the product. Compared with a traditional chemic grouting polyurethane material, the chemic grouting polyurethane material provided by invention has higher compression strength, adhesion strength, tensile strength, anti-osmotic performance and consumed water.

Description

technical field [0001] The invention relates to a polyurethane chemical grouting material and its prepolymer, and a preparation method thereof. Background technique [0002] Chemical grouting technology has been widely used in the four major fields of hydropower, construction, transportation and mining in my country. Polyurethane chemical grouting materials have become one of the most widely used and most widely used varieties. [0003] Polyurethane chemical grouting material is a chemical slurry composed of polyurethane prepolymer and additives (solvent, catalyst, retarder, surfactant, plasticizer, etc.). Its main component is an isocyanate group-terminated (NCO) prepolymer prepared by reacting excess isocyanate with polyether polyols. It is generally a single-liquid type, which can be immediately dispersed, emulsified, and chemically reacted to generate carbon dioxide when it meets water, which then expands, Consolidation, eventually forming a consolidated body that is in...

Claims

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Application Information

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IPC IPC(8): C08G18/48C08G18/12C08K3/32C08K5/092C08L75/08C08K13/02C08K5/357
Inventor 李心强董建国曹小伟于楠
Owner SHANGHAI DONGDA CHEM
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