Preparation method and application of magnesium silicate-based gelling material performance modifier

Abstract

The invention discloses a preparation method and application of a magnesium silicate-based gelling material performance modifier. The performance modifier is composed of a magnesium reinforcing agent, an organic dispersing solvent, an excitation catalyst, and toughened and reinforced cellulose. The magnesium reinforcing agent is composed of magnesium salicylate, magnesium tartrate (pentahydrate) and magnesium hexafluorophosphate, the organic dispersing solvent is composed of cyclopentyltriethoxysilane and alizarin aminocarboxylic acid complexing agent, the excitation catalyst is composed of tetrabutylammonium hexafluorophosphate and sodium heptanesulfonate, and the toughened and reinforced cellulose is composed of Rhizobium cellulose and Agrobacterium cellulose. The flowability and early mechanical properties of the magnesium silicate-based gelling material modified by the performance modifier are significantly improved, and the drying shrinkage performance is significantly reduced. This is of great significance to the application of magnesium silicate-based gelling materials in cement concrete products.

Description

Technical Field

[0001] The invention belongs to the field of civil engineering materials, and in particular relates to a preparation method and application of a magnesium silicate-based gelling material performance modifier. Background Art

[0002] Magnesium silicate-based cementitious material is a new type of low-carbon cementitious material. The carbon emission per ton of magnesium silicate cement is about 0.3t, which is significantly lower than the carbon emission of silicate cement. It is made by mixing magnesium raw materials, silicon raw materials and some admixtures with water. Its main hydration products are hydrated magnesium silicate gel (MSH) and magnesium hydroxide (Mg(OH) 2 ). Magnesium silicate-based cementitious materials have excellent characteristics such as light weight, high strength, thermal insulation, and low alkalinity. In recent years, they have become a hot topic of research. Scholars have applied them to insulation boards, refractory materials, and nuclear waste solidification, and have made good progress.

[0003] However, magnesium silicate-based cementitious materials also have defects such as slow hydration rate, low early strength, poor flow properties, and large shrinkage, which have greatly restricted the application of magnesium silicate-based cementitious materials in concrete. The poor flow properties and early strength make it difficult to construct smoothly and quickly. The large shrinkage causes large cracks in components and structures, posing many safety hazards.

[0004] In order to overcome these shortcomings, domestic and foreign scholars have mainly adopted measures such as selecting raw materials with specific properties, high temperature curing, and adding fibers for modification. However, these measures have not fundamentally solved the defects of magnesium silicate-based cementitious materials. Instead, they have restricted their construction conditions, making the application of magnesium silicate-based cementitious materials even more difficult. Therefore, there is an urgent need for a treatment method with good effect, low cost, and simple process to modify magnesium silicate-based cementitious materials. Summary of the invention

[0005] Based on the characteristics of magnesium silicate-based gelling materials and the defects of existing treatment measures and technologies, the present invention provides a preparation method and application of a magnesium silicate-based gelling material performance modifier.

[0006] A magnesium silicate-based gelling material performance modifier is prepared according to the following mass percentages: 21%-33% magnesium reinforcing agent, 38%-41% organic dispersing solvent, 23%-27% activating catalyst, and 6%-12% toughening and reinforcing cellulose.

[0007] The magnesium reinforcing agent accounts for 21%-33% of the total mass of the admixture, and is prepared from magnesium salicylate, magnesium tartrate (pentahydrate) and magnesium hexafluorophosphate in a mass ratio of 11:7:3.

[0008] The organic dispersing solvent accounts for 38%-41% of the total mass of the additive, and is prepared by mixing cyclopentyltriethoxysilane and alizarin aminocarboxylic acid complexing agent in a mass ratio of 7:4.

[0009] The excitation catalyst accounts for 23%-27% of the total mass of the additive and is prepared by tetrabutylammonium hexafluorophosphate and sodium heptane sulfonate in a mass ratio of 2:3.

[0010] The toughened and strengthened cellulose accounts for 6% to 12% of the total mass of the admixture and is prepared by mixing Rhizobium cellulose and Agrobacterium cellulose in a mass ratio of 4:3.

[0011] The preparation method of the magnesium silicate-based gelling material performance modifier is as follows:

[0012] a) Magnesium enhancer: Mix magnesium salicylate, magnesium tartrate (pentahydrate) and magnesium hexafluorophosphate in the enhancer according to the proportion, stir at 60-200 r / min for 5 minutes to make them evenly dispersed for use.

[0013] b) Organic dispersing solvent: Mix cyclopentyltriethoxysilane and alizarin aminocarboxylic acid complexing agent in the organic dispersing solvent according to the proportion, stir at 60-200 r / min for 10 min to make them dispersed evenly for use.

[0014] c) Excitation catalyst: tetrabutylammonium hexafluorophosphate and sodium heptane sulfonate in the excitation catalyst ratio are mixed according to the proportion, and stirred at 60-200 r / min for 5 minutes to make them evenly dispersed for use.

[0015] d) Toughening and strengthening cellulose: Rhizobium cellulose and Agrobacterium cellulose in the toughening and strengthening cellulose mixture are mixed according to the proportion, and stirred at 60-90 r / min for 5 minutes to make them evenly dispersed for use.

[0016] e) Preparation method of magnesium silicate-based gelling material modifier: add organic dispersing solvent to a magnetic stirring reactor under nitrogen protection and pressure of 1MPa, add excitation catalyst at 60-120r / min, stop for 20s after adding 20%, stir at 60-120r / min after all the excitation catalyst is added, add magnesium reinforcing agent, stir at 60-150r / min for 5min, heat the reactor to 40°C, and react for 2 hours. After the reaction is completed, cool to room temperature, add toughening and reinforcing cellulose, and disperse by ultrasonic for 10min to obtain the modifier prepared by the present invention.

[0017] The application method of the magnesium silicate-based gelling material performance modifier is as follows:

[0018] The magnesium silicate-based gelling material is prepared by mixing dry materials with water, wherein the dry materials are composed of magnesium oxide and silica fume in different proportions. When the present invention is used, stirring water accounting for 30%-50% of the dry material mass is first added into a stirring container, and a magnesium silicate-based gelling material performance modifier accounting for 5%-10% of the dry material mass is added under stirring at 60-200 r / min, and ultrasonic dispersion is performed for 5 minutes after stirring for 3 minutes. Then, the dry materials are added into the stirring container under stirring at 60-200 r / min, and stirred for 5-10 minutes to obtain a modified magnesium silicate-based gelling material. The slurry is poured into a test mold for molding and curing to obtain a finished modified magnesium silicate-based gelling material.

[0019] The effects of the present invention are as follows:

[0020] (1) The present invention aims at the problem of low early compressive strength of magnesium silicate-based cementitious materials, and adopts a magnesium reinforcing agent and an excitation catalyst. First, the magnesium reinforcing agent can quickly increase the concentration of magnesium ions in the system and accelerate the decomposition rate of the raw materials. Secondly, the excitation catalyst can react quickly between the raw materials, greatly promoting the generation of hydration products, improving the hydration degree of magnesium silicate-based cementitious materials, and improving their early strength.

[0021] (2) In order to solve the problem of poor fluidity of magnesium silicate-based cementitious materials, the present invention adopts an organic dispersing solvent. The organic dispersing solvent has excellent adsorption and polymerization effects, and can break up the silica fume molecules that are easily agglomerated when exposed to water, release the water contained therein, and enable the slurry to flow freely.

[0022] (3) The present invention aims to solve the defects of magnesium silicate-based gelling materials, such as poor flexural strength and large drying shrinkage, by using toughened and reinforced cellulose. The Rhizobium cellulose and Agrobacterium cellulose selected for the toughened and reinforced cellulose are both nano-scale bacterial cellulose, which can significantly enhance the flexural strength of the system and reduce the drying shrinkage of the system. DETAILED DESCRIPTION

[0023] The present invention is further described in detail below in conjunction with specific examples. The instruments and chemical reagents used in each example are all commercially available conventional products.

[0024] The present invention is further described in detail below in conjunction with specific examples. The instruments and chemical reagents used in each example are all commercially available conventional products.

[0025] Example 1

[0026] The dosage of each component of the modifier (by mass percentage) is: 27% magnesium reinforcing agent, 39% organic dispersing solvent, 25% activating catalyst, and 9% toughening and reinforcing cellulose.

[0027] (1) The preparation method of magnesium silicate-based gelling material performance modifier is as follows:

[0028] a) Magnesium enhancer: Mix magnesium salicylate, magnesium tartrate (pentahydrate) and magnesium hexafluorophosphate in the enhancer according to the proportion, stir at 100 r / min for 5 minutes to make them evenly dispersed for use.

[0029] b) Organic dispersing solvent: Mix cyclopentyltriethoxysilane and alizarin aminocarboxylic acid complexing agent in the organic dispersing solvent according to the proportion, stir at 100 r / min for 10 min to make them dispersed evenly for use.

[0030] c) Excitation catalyst: tetrabutylammonium hexafluorophosphate and sodium heptane sulfonate in the excitation catalyst ratio are mixed according to the proportion, and stirred at 100 r / min for 5 minutes to make them evenly dispersed for use.

[0031] d) Toughening and strengthening cellulose: Rhizobium cellulose and Agrobacterium cellulose in the toughening and strengthening cellulose mixture are mixed according to a certain proportion, and stirred at 60 r / min for 5 minutes to make them evenly dispersed for later use.

[0032] e) Preparation method of magnesium silicate-based gelling material modifier: add organic dispersing solvent into a magnetic stirring reactor under nitrogen protection and pressure of 1MPa, add excitation catalyst at 60r / min, stop for 20s after adding 20%, stir at 90r / min after all the excitation catalyst is added, add magnesium reinforcing agent, stir at 150r / min for 5min, heat the reactor to 40°C, and react for 2 hours. After the reaction is completed, cool to room temperature, add toughening and reinforcing cellulose, and disperse by ultrasonic for 10min to obtain the modifier prepared by the present invention.

[0033] (2) The application method of magnesium silicate-based gelling material performance modifier is as follows:

[0034] The magnesium silicate-based gelling material is prepared by mixing dry materials with water, wherein the dry materials are composed of magnesium oxide and silica fume in a mass ratio of 3:7. When the present invention is used, stirring water accounting for 40% of the mass of the dry materials is first added into a stirring container, and a magnesium silicate-based gelling material performance modifier accounting for 8% of the mass of the dry materials is added under stirring at 120 r / min, and ultrasonic dispersion is performed for 5 minutes after stirring for 3 minutes. Then, the dry materials are added into a container under stirring at 120 r / min, and stirred for 8 minutes to obtain a modified magnesium silicate-based gelling material. The slurry is poured into a test mold for molding and curing to obtain a finished modified magnesium silicate-based gelling material.

[0035] Example 2

[0036] The dosage of each component of the modifier (by mass percentage) is: 33% magnesium reinforcing agent, 38% organic dispersing solvent, 23% activating catalyst, and 6% toughening and reinforcing cellulose.

[0037] (1) The preparation method of magnesium silicate-based gelling material performance modifier is as follows:

[0038] a) Magnesium enhancer: Mix magnesium salicylate, magnesium tartrate (pentahydrate) and magnesium hexafluorophosphate in the enhancer in a mass ratio of 11:7:3, and stir at 100 r / min for 5 min to make them evenly dispersed for use.

[0039] b) Organic dispersing solvent: Mix cyclopentyltriethoxysilane and alizarin aminocarboxylic acid complexing agent in the organic dispersing solvent according to the proportion, stir at 100 r / min for 10 min to make them dispersed evenly for use.

[0040] c) Excitation catalyst: tetrabutylammonium hexafluorophosphate and sodium heptane sulfonate in the excitation catalyst mixture were mixed in a mass ratio of 2:3, and stirred at 100 r / min for 5 min to make them evenly dispersed for use.

[0041] d) Toughening and strengthening cellulose: Rhizobium cellulose and Agrobacterium cellulose in the toughening and strengthening cellulose mixture are mixed in a mass ratio of 4:3, and stirred at 60 r / min for 5 minutes to make them evenly dispersed for use.

[0042] e) Preparation method of magnesium silicate-based gelling material modifier: add organic dispersing solvent into a magnetic stirring reactor under nitrogen protection and pressure of 1MPa, add excitation catalyst at 60r / min, stop for 20s after adding 20%, stir at 90r / min after all the excitation catalyst is added, add magnesium reinforcing agent, stir at 150r / min for 5min, heat the reactor to 40°C, and react for 2 hours. After the reaction is completed, cool to room temperature, add toughening and reinforcing cellulose, and disperse by ultrasonic for 10min to obtain the modifier prepared by the present invention.

[0043] (2) The application method of magnesium silicate-based gelling material performance modifier is as follows:

[0044] The magnesium silicate-based gelling material is prepared by mixing dry materials with water, wherein the dry materials are composed of magnesium oxide and silica fume in a mass ratio of 3:7. When the present invention is used, stirring water of 30% of the dry material mass is first added into a stirring container, and a magnesium silicate-based gelling material performance modifier of 5% of the dry material mass is added under stirring at 150 r / min, and ultrasonic dispersion is performed for 5 minutes after stirring for 3 minutes. Then, the dry materials are added into a container under stirring at 150 r / min, and stirred for 10 minutes to obtain a modified magnesium silicate-based gelling material. The slurry is poured into a test mold for molding and curing to obtain a finished modified magnesium silicate-based gelling material.

[0045] Example 3

[0046] The dosage of each component of the modifier (by mass percentage) is: 26% magnesium reinforcing agent, 41% organic dispersing solvent, 27% activating catalyst, and 6% toughening and reinforcing cellulose.

[0047] (1) The preparation method of magnesium silicate-based gelling material performance modifier is as follows:

[0048] a) Magnesium enhancer: Mix magnesium salicylate, magnesium tartrate (pentahydrate) and magnesium hexafluorophosphate in the enhancer in a mass ratio of 11:7:3, and stir at 100 r / min for 5 min to make them evenly dispersed for use.

[0049] b) Organic dispersing solvent: Mix cyclopentyltriethoxysilane and alizarin aminocarboxylic acid complexing agent in the organic dispersing solvent according to the proportion, stir at 100 r / min for 10 min to make them dispersed evenly for use.

[0050] c) Excitation catalyst: tetrabutylammonium hexafluorophosphate and sodium heptane sulfonate in the excitation catalyst mixture were mixed in a mass ratio of 2:3, and stirred at 100 r / min for 5 min to make them evenly dispersed for use.

[0051] d) Toughening and strengthening cellulose: Rhizobium cellulose and Agrobacterium cellulose in the toughening and strengthening cellulose mixture are mixed in a mass ratio of 4:3, and stirred at 60 r / min for 5 minutes to make them evenly dispersed for use.

[0052] e) Preparation method of magnesium silicate-based gelling material modifier: add organic dispersing solvent into a magnetic stirring reactor under nitrogen protection and pressure of 1MPa, add excitation catalyst at 60r / min, stop for 20s after adding 20%, stir at 90r / min after all the excitation catalyst is added, add magnesium reinforcing agent, stir at 150r / min for 5min, heat the reactor to 40°C, and react for 2 hours. After the reaction is completed, cool to room temperature, add toughening and reinforcing cellulose, and disperse by ultrasonic for 10min to obtain the modifier prepared by the present invention.

[0053] (2) The application method of magnesium silicate-based gelling material performance modifier is as follows:

[0054] The magnesium silicate-based gelling material is prepared by mixing dry materials with water, wherein the dry materials are composed of magnesium oxide and silica fume in a mass ratio of 3:7. When the present invention is used, stirring water of 35% of the dry materials mass is first added into a stirring container, and a magnesium silicate-based gelling material performance modifier of 6% of the dry materials mass is added under stirring at 140 r / min, and ultrasonic dispersion is performed for 5 minutes after stirring for 3 minutes. Then, the dry materials are added into a container under stirring at 140 r / min, and stirred for 9 minutes to obtain a modified magnesium silicate-based gelling material. The slurry is poured into a test mold for molding and cured to obtain a finished modified magnesium silicate-based gelling material.

[0055] Example 4

[0056] The dosage of each component of the modifier (by mass percentage) is: 21% magnesium reinforcing agent, 40% organic dispersing solvent, 27% activating catalyst, and 12% toughening and reinforcing cellulose.

[0057] (1) The preparation method of magnesium silicate-based gelling material performance modifier is as follows:

[0058] a) Magnesium enhancer: Mix magnesium salicylate, magnesium tartrate (pentahydrate) and magnesium hexafluorophosphate in the enhancer in a mass ratio of 11:7:3, and stir at 100 r / min for 5 min to make them evenly dispersed for use.

[0059] b) Organic dispersing solvent: Mix cyclopentyltriethoxysilane and alizarin aminocarboxylic acid complexing agent in the organic dispersing solvent according to the proportion, stir at 100 r / min for 10 min to make them dispersed evenly for use.

[0060] c) Excitation catalyst: tetrabutylammonium hexafluorophosphate and sodium heptane sulfonate in the excitation catalyst mixture were mixed in a mass ratio of 2:3, and stirred at 100 r / min for 5 min to make them evenly dispersed for use.

[0061] d) Toughening and strengthening cellulose: Rhizobium cellulose and Agrobacterium cellulose in the toughening and strengthening cellulose mixture are mixed in a mass ratio of 4:3, and stirred at 60 r / min for 5 minutes to make them evenly dispersed for use.

[0062] e) Preparation method of magnesium silicate-based gelling material modifier: add organic dispersing solvent into a magnetic stirring reactor under nitrogen protection and pressure of 1MPa, add excitation catalyst at 60r / min, stop for 20s after adding 20%, stir at 90r / min after all the excitation catalyst is added, add magnesium reinforcing agent, stir at 150r / min for 5min, heat the reactor to 40°C, and react for 2 hours. After the reaction is completed, cool to room temperature, add toughening and reinforcing cellulose, and disperse by ultrasonic for 10min to obtain the modifier prepared by the present invention.

[0063] (2) The application method of magnesium silicate-based gelling material performance modifier is as follows:

[0064] The magnesium silicate-based gelling material is prepared by mixing dry materials with water, wherein the dry materials are composed of magnesium oxide and silica fume in a mass ratio of 3:7. When the present invention is used, stirring water accounting for 45% of the mass of the dry materials is first added into a stirring container, and a magnesium silicate-based gelling material performance modifier accounting for 9% of the mass of the dry materials is added under stirring at 100 r / min, and ultrasonic dispersion is performed for 5 minutes after stirring for 3 minutes. Then, the dry materials are added into a container under stirring at 100 r / min, and stirred for 7 minutes to obtain a modified magnesium silicate-based gelling material. The slurry is poured into a test mold for molding and curing to obtain a finished modified magnesium silicate-based gelling material.

[0065] Example 5

[0066] The dosage of each component of the modifier (by mass percentage) is: 24% magnesium reinforcing agent, 41% organic dispersing solvent, 23% activating catalyst, and 12% toughening and reinforcing cellulose.

[0067] (1) The preparation method of magnesium silicate-based gelling material performance modifier is as follows:

[0068] a) Magnesium enhancer: Mix magnesium salicylate, magnesium tartrate (pentahydrate) and magnesium hexafluorophosphate in the enhancer in a mass ratio of 11:7:3, and stir at 100 r / min for 5 min to make them evenly dispersed for use.

[0069] b) Organic dispersing solvent: Mix cyclopentyltriethoxysilane and alizarin aminocarboxylic acid complexing agent in the organic dispersing solvent according to the proportion, stir at 100 r / min for 10 min to make them dispersed evenly for use.

[0070] c) Excitation catalyst: tetrabutylammonium hexafluorophosphate and sodium heptane sulfonate in the excitation catalyst mixture were mixed in a mass ratio of 2:3, and stirred at 100 r / min for 5 min to make them evenly dispersed for use.

[0071] d) Toughening and strengthening cellulose: Rhizobium cellulose and Agrobacterium cellulose in the toughening and strengthening cellulose mixture are mixed in a mass ratio of 4:3, and stirred at 60 r / min for 5 minutes to make them evenly dispersed for use.

[0072] e) Preparation method of magnesium silicate-based gelling material modifier: add organic dispersing solvent into a magnetic stirring reactor under nitrogen protection and pressure of 1MPa, add excitation catalyst at 60r / min, stop for 20s after adding 20%, stir at 90r / min after all the excitation catalyst is added, add magnesium reinforcing agent, stir at 150r / min for 5min, heat the reactor to 40°C, and react for 2 hours. After the reaction is completed, cool to room temperature, add toughening and reinforcing cellulose, and disperse by ultrasonic for 10min to obtain the modifier prepared by the present invention.

[0073] (2) The application method of magnesium silicate-based gelling material performance modifier is as follows:

[0074] The magnesium silicate-based gelling material is prepared by mixing dry materials with water, wherein the dry materials are composed of magnesium oxide and silica fume in a mass ratio of 3:7. When the present invention is used, stirring water of 50% of the dry material mass is first added into a stirring container, and a magnesium silicate-based gelling material performance modifier of 10% of the dry material mass is added under stirring at 90 r / min, and ultrasonic dispersion is performed for 5 minutes after stirring for 3 minutes. Then, the dry materials are added into a container under stirring at 90 r / min, and stirred for 6 minutes to obtain a modified magnesium silicate-based gelling material. The slurry is poured into a test mold for molding and curing to obtain a finished modified magnesium silicate-based gelling material.

[0075] In order to reflect the influence of the present invention on the performance of magnesium silicate-based cementitious materials, according to the raw material proportions and preparation methods of Examples 1-5, the magnesium silicate-based cementitious material performance modifier was removed to set comparative examples 1-5.

[0076] The fluidity of the finished modified magnesium silicate-based cementitious material was tested according to GBT 2419-2016 "Method for Determination of Fluidity of Cement Mortar", the 3d compressive and flexural strength of the finished modified magnesium silicate-based cementitious material was tested according to GB / T 17671-2020 "Test Method for Strength of Cement Mortar (ISO Method)", and the drying shrinkage of the finished modified magnesium silicate-based cementitious material was tested according to JC / T603-2004 "Test Method for Drying Shrinkage of Cement Mortar". The test results of fluidity, 3d compressive and flexural strength, and drying shrinkage of the finished modified magnesium silicate-based cementitious material are shown in Table 1.

[0077] Table 1: Flowability, 3d compressive flexural strength, and drying shrinkage of each embodiment and comparative example

[0078]

[0079] As can be seen from Table 1, compared with Comparative Examples 1-5, the fluidity and 3d compressive and flexural strength of Examples 1-5 are significantly improved, and the drying shrinkage rate is significantly reduced. In Example 2 and Comparative Example 2 with low water-cement ratio, the fluidity modification effect is the best, and the fluidity of Example 2 is improved by 119%. In Example 5 and Comparative Example 5 with high water-cement ratio, the 3d compressive and flexural strength and drying shrinkage rate modification effects are the best, and the 3d compressive and flexural strength of Example 5 are improved by 500% and 223% respectively, and the drying shrinkage rate is reduced by 71%. This shows that the present invention has a very excellent modification effect on the fluidity, 3d compressive and flexural strength, and drying shrinkage rate of magnesium silicate-based cementitious materials.

Claims

1. A method for preparing a magnesium silicate-based gelling material performance modifier, characterized in that: It is formulated according to the following components: magnesium reinforcing agent, organic dispersing solvent, activating catalyst, toughening and reinforcing cellulose; (1) The magnesium enhancer accounts for 21%-33% of the total mass of the modifier, and is prepared by mixing magnesium salicylate, magnesium tartrate pentahydrate and magnesium hexafluorophosphate in a mass ratio of 11:7:3; (2) the organic dispersing solvent accounts for 38%-41% of the total mass of the modifier, and is prepared by cyclopentyltriethoxysilane and alizarin aminocarboxylic acid complexing agent in a mass ratio of 7:4; (3) The excitation catalyst accounts for 23%-27% of the total mass of the modifier and is prepared by tetrabutylammonium hexafluorophosphate and sodium heptane sulfonate in a mass ratio of 2:3; (4) The toughened and strengthened cellulose accounts for 6% to 12% of the total mass of the modifier and is prepared by mixing Rhizobium cellulose and Agrobacterium cellulose in a mass ratio of 4:3; The specific preparation method is as follows: a) Magnesium enhancer: Mix magnesium salicylate, magnesium tartrate pentahydrate and magnesium hexafluorophosphate in the enhancer according to the proportion, stir at 60-200 r / min for 5 min to make them evenly dispersed for later use; b) Organic dispersing solvent: Mix cyclopentyltriethoxysilane and alizarin aminocarboxylic acid complexing agent in the organic dispersing solvent according to the proportion, stir at 60-200r / min for 10min to make them dispersed evenly for use; c) Exciting the catalyst: Mix tetrabutylammonium hexafluorophosphate and sodium heptanesulfonate in the exciting catalyst according to the proportion, stir at 60-200 r / min for 5 min to make them evenly dispersed for later use; d) Toughening and strengthening cellulose: Rhizobium cellulose and Agrobacterium cellulose in the toughening and strengthening cellulose mixture are mixed according to a certain proportion, and stirred at 60-90 r / min for 5 minutes to make them evenly dispersed for later use; e) Preparation method of magnesium silicate-based gelling material modifier: In a magnetic stirring reactor protected by nitrogen and with a pressure of 1 MPa, an organic dispersing solvent is added, an excitation catalyst is added at 60-120 r / min, and a pause of 20 seconds is made after each 20% of the excitation catalyst is added. After all the excitation catalysts are added, stirring is performed at 60-120 r / min, a magnesium reinforcing agent is added, and stirring is performed at 60-150 r / min for 5 minutes. The reactor is heated to 40°C and reacted for 2 hours. After the reaction is completed, the reactor is cooled to room temperature, toughening and reinforcing cellulose is added, and ultrasonic dispersion is performed for 10 minutes to obtain a modifier.

2. Application of the magnesium silicate-based gelling material performance modifier prepared by the preparation method according to claim 1, characterized in that: The magnesium silicate-based gelling material is prepared by mixing dry materials with water, wherein the dry materials are composed of magnesium oxide and silica fume in a mass ratio of 3:

7. When used, 30%-50% of the mass of the dry materials by mixing water is first added into a mixing container, and under stirring at 60-200r / min, 5-10% of the mass of the dry materials by magnesium silicate-based gelling material performance modifier is added, and after stirring for 3 minutes, ultrasonic dispersion is performed for 5 minutes, and then under stirring at 60-200r / min, the dry materials are added into a mixing container, and stirred for 5-10 minutes to obtain a modified magnesium silicate-based gelling material. The slurry is poured into a test mold for molding and curing to obtain a finished modified magnesium silicate-based gelling material.

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