CN117165065A - Gangue/polyurethane grouting composite material and preparation method thereof - Google Patents

Abstract

The invention provides a gangue/polyurethane grouting composite material and a preparation method thereof, and relates to the technical field of grouting materials. According to the invention, the silane coupling agent is adopted to carry out surface modification on the gangue powder, and the modified gangue powder is used as a filler to be added into the polyurethane grouting material, so that the cost of the grouting material is reduced, and meanwhile, the composite grouting material is ensured to still have high enough compressive strength. The prepared gangue/polyurethane grouting composite material has the advantages of short curing time, quick construction period, easy construction, compressive strength higher than 40MPa within 24 hours and applicability to structural reinforcement and repair engineering.

Description

A kind of coal gangue/polyurethane grouting composite material and preparation method thereof

Technical field

The invention relates to the technical field of grouting materials, and in particular to a gangue-modified polyurethane grouting composite material and a preparation method thereof.

Background technique

Due to the particularity of large-scale infrastructure or structural reinforcement and repair projects caused by disasters, they often require the characteristics of good reinforcement and repair effects, fast construction period and easy construction. Grouting is one of the commonly used reinforcement methods. Traditional inorganic grouting materials have the disadvantages of long curing time, low early strength, and easy failure due to changes in geological structure. Although polymer grouting materials such as polyurethane overcome the above shortcomings, the cost of such grouting materials is high, which limits the It is widely used.

The present invention uses modified coal gangue powder as filler to reduce the cost of polyurethane polymer grouting materials, while retaining the advantages of polyurethane materials such as fast curing, convenient construction, high early strength and good toughness.

Contents of the invention

Based on this, the present invention provides a gangue-modified polyurethane grouting composite material and a preparation method thereof. The present invention is specifically implemented by adopting the following technical solutions:

A preparation method of coal gangue/polyurethane grouting composite material, including the following steps

(1) Surface modification and activation treatment of coal gangue powder:

Pour the coal gangue powder into an ethanol aqueous solution containing a silane coupling agent, stir and react, then filter, dry, and pulverize to obtain surface-modified coal gangue powder; the surface-modified coal gangue powder is heated at a constant temperature of 120°C Keep it for 2 hours and then cool to room temperature to obtain activated surface-modified coal gangue powder;

(2) Preparation of gangue/polyurethane grouting composite materials:

Mix polyether glycol, polyether triol and the activated surface-modified coal gangue powder in a mass ratio of 20:30~33:9~56 to obtain component A; in the isocyanate, the organic tin catalyst is After mixing evenly, component B is obtained. The mass ratio of the isocyanate to the organotin catalyst is 45-68:0.15; the component A and component B are stirred and mixed at a mass ratio of 19-30:10. Evenly, and then left to solidify to obtain the gangue/polyurethane grouting composite material.

Preferably, the coal gangue powder in step (1) is commercially available coal gangue powder with a fineness of ≤300 mesh, and the silane coupling agent is one of KH550, KH-560 or KH561.

Preferably, the solid-liquid ratio of the coal gangue powder and the ethanol aqueous solution containing the silane coupling agent is 10:9.

Preferably, the polyether diol in step (2) is PPG-2000 with a hydroxyl value of 55±10 or PPG-1000 with a hydroxyl value of 110±10, and the polyether triol has a hydroxyl value of 300± RT-305 of 70;

Preferably, the isocyanate is polymethylene polyphenyl isocyanate produced by Wanhua Chemical Group Co., Ltd., with the brand name PM200;

Preferably, the organotin catalyst is one or a combination of two of dibutyltin diisilicate or stannous octoate.

Compared with the prior art, the present invention has the following beneficial effects:

The invention provides a gangue-modified polyurethane grouting composite material and a preparation method thereof. The gangue is surface modified by using a silane coupling agent, and the modified gangue is added as a filler to the polyurethane grouting material. , reducing the cost of grouting materials. The coal gangue/polyurethane grouting composite material prepared by the invention has a curing time of less than 140s, a compressive strength of more than 40MPa within 24 hours, and an elongation at break of more than 55%. While ensuring high strength, it also has a certain degree of toughness to avoid failure of structural reinforcement and repair projects due to changes in geological structure.

Detailed ways

The present invention will be further described below in conjunction with the examples.

Example 1

A preparation method of gangue modified/polyurethane grouting composite material, the steps are as follows:

(1) Surface modification and activation treatment of coal gangue powder:

Pour 200g of coal gangue powder into 200mL of ethanol aqueous solution containing 2.5wt% silane coupling agent KH550 (the volume ratio of ethanol to water is 9:1), stir the reaction at 600rpm for 60min, then filter and dry at 60°C for 4 hours. , crushing treatment to obtain surface-modified coal gangue powder; keep the surface-modified coal gangue powder at a constant temperature of 120°C for 2 hours and then cool to room temperature to obtain activated surface-modified coal gangue powder;

(2) Preparation of gangue/polyurethane grouting composite materials:

Mix PPG-2000, RT-305 and the activated surface-modified coal gangue powder in a mass ratio of 21:35:10 to obtain component A; add organotin catalyst dibutyltin dilaurate to the isocyanate PM200, After mixing evenly, component B is obtained. The mass ratio of the isocyanate to the organotin catalyst is 68:0.15. The component A and component B are stirred and mixed at a mass ratio of 19:10 until uniform, and then statically After solidification, the gangue/polyurethane grouting composite material is obtained.

Example 2

A preparation method of gangue modified/polyurethane grouting composite material, the steps are as follows:

(1) Surface modification and activation treatment of coal gangue powder:

Pour 200g of coal gangue powder into 200mL of ethanol aqueous solution containing 2.5wt% silane coupling agent KH560 (the volume ratio of ethanol to water is 9:1), stir and react at 600rpm for 60min, then filter, dry at 60°C for 4h, and crush Process to obtain surface-modified coal gangue powder; insulate the surface-modified coal gangue powder at a constant temperature of 120°C for 2 hours and then cool to room temperature to obtain activated surface-modified coal gangue powder;

(2) Preparation of gangue/polyurethane grouting composite materials:

Mix PPG-2000, RT-305 and the activated surface-modified coal gangue powder in a mass ratio of 2:3:2 to obtain component A; add organotin catalyst dibutyltin dilaurate to the isocyanate PM200, After mixing evenly, component B is obtained. The mass ratio of the isocyanate to the organotin catalyst is 60:0.15. The component A and component B are stirred and mixed at a mass ratio of 7:3 until uniform, and then statically After solidification, the gangue/polyurethane grouting composite material is obtained.

Example 3

A preparation method of gangue modified/polyurethane grouting composite material, the steps are as follows:

(1) Surface modification and activation treatment of coal gangue powder:

Pour 200g of coal gangue powder into 200mL of ethanol aqueous solution containing 2.5wt% silane coupling agent KH561 (the volume ratio of ethanol to water is 9:1), stir the reaction at 600rpm for 60min, filter, and dry at 60°C for 4h. Crush treatment to obtain surface-modified coal gangue powder; keep the surface-modified coal gangue powder at a constant temperature of 120°C for 2 hours and then cool to room temperature to obtain activated surface-modified coal gangue powder;

(2) Preparation of gangue/polyurethane grouting composite materials:

Mix PPG-2000, RT-305 and the activated surface-modified coal gangue powder in a mass ratio of 33:54:60 to obtain component A; add organotin catalyst dibutyltin dilaurate and octanoic acid to the isocyanate PM200 Stannous, mix uniformly to obtain component B. The mass ratio of the isocyanate to the organotin catalyst is 53:0.15; stir and mix the component A and component B at a mass ratio of 3:1 until uniform. , and then left to solidify to obtain the gangue/polyurethane grouting composite material.

Example 4

A preparation method of gangue modified/polyurethane grouting composite material, the steps are as follows:

(1) Surface modification and activation treatment of coal gangue powder:

Pour 200g of coal gangue powder into 200mL of ethanol aqueous solution containing 2.5wt% silane coupling agent KH560 (the volume ratio of ethanol to water is 9:1), stir and react at 600rpm for 60min, then filter, dry at 60°C for 4h, and crush Process to obtain surface-modified coal gangue powder; insulate the surface-modified coal gangue powder at a constant temperature of 120°C for 2 hours and then cool to room temperature to obtain activated surface-modified coal gangue powder;

(2) Preparation of gangue/polyurethane grouting composite materials:

Mix PPG-2000, RT-305 and the activated surface-modified coal gangue powder in a mass ratio of 14:23:40 to obtain component A; add organotin catalyst dibutyltin dilaurate and isocyanate PM200. Stannous octoate is mixed evenly to obtain component B. The mass ratio of the isocyanate to the organotin catalyst is 45:0.15; the component A and component B are stirred and mixed at a mass ratio of 3:1. Evenly, and then left to solidify to obtain the gangue/polyurethane grouting composite material.

Example 5

A preparation method of gangue modified/polyurethane grouting composite material, the steps are as follows:

(1) Surface modification and activation treatment of coal gangue powder:

Pour 200g of coal gangue powder into 200mL of ethanol aqueous solution containing 2.5wt% silane coupling agent KH561 (the volume ratio of ethanol to water is 9:1), stir the reaction at 600rpm for 60min, filter, and dry at 60°C for 4h. Crush treatment to obtain surface-modified coal gangue powder; keep the surface-modified coal gangue powder at a constant temperature of 120°C for 2 hours and then cool to room temperature to obtain activated surface-modified coal gangue powder;

(2) Preparation of gangue/polyurethane grouting composite materials:

Mix PPG-1000, RT-305 and the activated surface-modified coal gangue powder at a mass ratio of 19:31:20 to obtain component A; add organotin catalyst dibutyltin dilaurate to the isocyanate PM200, After mixing evenly, component B is obtained. The mass ratio of the isocyanate to the organotin catalyst is 60:0.15. The component A and component B are stirred and mixed at a mass ratio of 7:3 until uniform, and then statically After solidification, the gangue/polyurethane grouting composite material is obtained.

The curing time, compressive strength and elongation at break of the prepared coal gangue/polyurethane grouting composite material were tested in accordance with JCT 2041-2020 standards.

Table 1 Example performance data

The above are only preferred embodiments of the present invention. It should be noted that those skilled in the art can make several improvements and modifications without departing from the principles of the present invention. These improvements and modifications can also be made. should be regarded as the protection scope of the present invention.

Claims (4)

1. The preparation method of the gangue/polyurethane grouting composite material is characterized by comprising the following steps of:

(1) Surface modification and activation treatment of coal gangue powder:

pouring gangue powder into an ethanol water solution containing a silane coupling agent, stirring for reaction, and then filtering, drying and crushing to obtain surface modified gangue powder; the surface modified coal gangue powder is kept at the constant temperature of 120 ℃ for 2 hours and then cooled to room temperature, so that activated surface modified coal gangue powder is obtained;

(2) Preparation of a gangue/polyurethane grouting composite material:

polyether glycol, polyether triol and the activated surface modified coal gangue powder are mixed according to the mass ratio of 20: 30-33: 9-56, and obtaining a component A; an organic tin catalyst in isocyanate is uniformly mixed to obtain a component B, wherein the mass ratio of the isocyanate to the organic tin catalyst is 45-68:0.15; and stirring and mixing the component A and the component B according to the mass ratio of 19-30:10 until the components are uniform, and standing and solidifying to obtain the coal gangue/polyurethane grouting composite material.

2. The preparation method of claim 1, wherein the gangue powder in the step (1) is a commercially available gangue powder with fineness less than or equal to 300 meshes, and the silane coupling agent is one of KH550, KH-560 or KH 561.

3. The method according to claim 1, wherein the solid-to-liquid ratio of the gangue powder to the aqueous ethanol solution containing the silane coupling agent is 10:9.

4. The method for preparing a coal gangue/polyurethane grouting composite material according to claim 1, wherein the polyether glycol in the step (2) is PPG-2000 with a hydroxyl value of 55+ -10 or PPG-1000 with a hydroxyl value of 110+ -10, and the polyether glycol is RT-305 with a hydroxyl value of 300+ -70; the isocyanate is polymethylene polyphenyl isocyanate produced by Wanhua chemical group Co., ltd, and the brand is PM200; the organotin catalyst is one or the combination of two of dibutyl tin dilaurate or stannous octoate.