Toughening and reinforcing filling material for shock insulation

Abstract

The invention discloses a toughening and reinforcing filling material for shock insulation, and belongs to the technical field of shock insulation material preparation, the toughening and reinforcing filling material for shock insulation comprises a component A, a component B and a component C. The component A comprises rigid modified boron nitride microfibers as a reinforcing component, and the component B comprises a diol chain extender capable of performing Diels-Alder reversible addition reaction as a toughening component. The component C simultaneously contains soft and hard segment molecular structures and modified silicon dioxide nanotubes with amino functional groups on the surfaces and is a reinforcing and toughening component, the synergistic reinforcing and toughening capability of different components can be effectively exerted in the normal-temperature curing and forming process after the components are mixed, the overall mechanical property of the material is improved, and the service life of the material is prolonged. The filling material with relatively high strength, high elasticity and high toughness is prepared.

Description

Technical Field

[0001] The present invention relates to the technical field of the preparation of seismic isolation materials, and particularly relates to a toughened and strengthened filling material for seismic isolation. Background Art

[0002] With the development of underground engineering construction in China, the encountered geological conditions have become increasingly complex. Many underground projects, such as underground tunnels, etc., inevitably have to be built in poor geological sections. Earthquakes are likely to occur in these places, resulting in cracking, dislocation, and even collapse of tunnels, etc., causing a significant impact on people's lives and safety. If the characteristics of grouting construction can be combined, and the grouting material is replaced with a toughened and strengthened filling material to form a new seismic isolation system of "tunnel - seismic isolation layer - surrounding rock", the purpose of "isolating" seismic energy can be achieved. The key to this seismic isolation technology lies in the seismic isolation material with the above performance characteristics. Therefore, developing a toughened and strengthened filling material is a key problem that urgently needs to be solved for the seismic isolation of underground projects. Summary of the Invention

[0003] In view of the above problems, the present invention provides a toughened and strengthened filling material for seismic isolation.

[0004] The object of the present invention is achieved by the following technical solutions:

[0005] A toughened and strengthened filling material for seismic isolation, comprising component A, component B, and component C, wherein,

[0006] The preparation method of the component A comprises the following steps:

[0007] A1. Disperse chopped boron nitride in water, adjust the pH to be alkaline, add sodium hexametaphosphate, stir and mix, then perform ultrasonic treatment, centrifuge at low speed to separate the supernatant, and then centrifuge at high speed to separate the precipitate for standby;

[0008] A2. Take the precipitate separated in step A1, ultrasonically disperse it in an alkaline aqueous solution of Tween 20, separate the precipitate, wash it with water and dry it to obtain modified chopped boron nitride;

[0009] A3. Ultrasonically disperse the modified chopped boron nitride in hexamethylene diisocyanate to obtain a uniform white slurry, and obtain the component A;

[0010] The preparation method of the component B comprises the following steps:

[0011] B1. Dissolve maleic anhydride in ethyl acetate, add furan, stir and react at room temperature for 32-36 hours, add petroleum ether and stir to mix, separate the precipitate and wash with petroleum ether, dry the precipitate and dissolve it in methanol, add methanol solution of ethanolamine dropwise at 0-2°C with stirring, stir and react at room temperature for 12 hours after the addition is complete, continue to stir and react at 63-65°C for 30 hours, and cool at -25°C to -20°C after the reaction is complete, separate the precipitate and wash with petroleum ether and dry;

[0012] B2, adding the precipitate dried in step B1 into xylene, stirring at 125-127°C, cooling and standing, separating and removing the yellow oily liquid at the bottom, collecting the remaining liquid, standing and cooling at -25°C--20°C, separating the precipitate and washing it with petroleum ether, and drying the precipitate to obtain a light yellow powder product;

[0013] B3, adding the light yellow powder product and 3-furanmethanol into methanol, stirring and reacting at 63-65°C for 15-18h, cooling at -25°C to -20°C, separating the precipitate and adding it into ethyl acetate, stirring and mixing at 48-50°C, separating the precipitate, and drying to obtain the component B;

[0014] The preparation method of component C comprises the following steps:

[0015] C1. Ultrasonic dispersion of silica nanotubes in an alkaline Tween 40 aqueous solution, separation of precipitates, washing with water, drying, stirring and dispersion in a sodium hydroxide solution, separation of precipitates, washing with water, ultrasonic dispersion in water, low-speed centrifugation to separate supernatant, high-speed centrifugation to separate precipitates, stirring and dispersion of precipitates in a hydrogen peroxide solution, separation of precipitates, washing with water, drying, and standby use;

[0016] C2. The silica nanotubes obtained in step C1 are mixed with γ-aminopropyltriethoxysilane and anhydrous sodium carbonate, and the mixture is stirred and reacted at 70-80° C. for 20-30 hours. After the reaction is completed, the mixture is cooled, and the precipitate is separated and washed with anhydrous ethanol and tetrahydrofuran respectively. After vacuum drying, the mixture is added to the polymer polyol, and the mixture is fully stirred and mixed to obtain the component C.

[0017] In some preferred embodiments, the short-cut boron nitride in step A1 has an average length of 3-4 μm and an average diameter of 140-180 nm.

[0018] In some preferred embodiments, the mass ratio of the chopped boron nitride to the sodium hexametaphosphate is (150-170):1.

[0019] In some preferred embodiments, the rotation speed of the low-speed centrifugation in step A1 is 300-500 rpm, and the centrifugation time is 5-10 min; the rotation speed of the high-speed centrifugation is 2000-3000 rpm, and the centrifugation time is 10-20 min.

[0020] In some preferred embodiments, the pH of the alkaline Tween 20 aqueous solution in step A2 is 8-9, and the mass concentration is 5-10 wt%.

[0021] In some preferred embodiments, the mass ratio of the modified chopped boron nitride to the hexamethylene diisocyanate in step A3 is 1:(8-9).

[0022] In some preferred embodiments, the mass ratio of the maleic anhydride to the furan and the ethanolamine in step B1 is (1.6-1.74):(1.1-1.28):1.

[0023] In some preferred embodiments, the mass ratio of the powder product to the 3-furanmethanol in step B3 is 1:(0.7-0.8).

[0024] In some preferred embodiments, the pH of the alkaline Tween 40 aqueous solution in step C1 is 8-9, and the mass concentration is 15-25 wt %; the mass concentration of the sodium hydroxide solution is 20-28%.

[0025] In some preferred embodiments, the rotation speed of the low-speed centrifugation in step C1 is 1000-2000 rpm, and the centrifugation time is 10-20 min; the rotation speed of the high-speed centrifugation is 6000-8000 rpm, and the centrifugation time is 10-20 min; and the mass concentration of the hydrogen peroxide solution is 10-20 wt%.

[0026] In some preferred embodiments, the mass ratio of the silica nanotubes to the γ-aminopropyltriethoxysilane and the anhydrous sodium carbonate in step C2 is (30-35):(90-100):1.

[0027] In some preferred embodiments, the mass ratio of the precipitate to the polymer polyol in step C3 is (10-12):1.

[0028] In some preferred embodiments, the polymer polyol has a molecular weight of 4000, a functionality of 2, a hydroxyl value of 27-29, a viscosity of 800-1000, an acid value of no more than 0.05, and a water content of no more than 0.02.

[0029] In some preferred embodiments, the component A comprises 14-23 parts, the component B comprises 5-10 parts, and the component C comprises 25-40 parts by mass.

[0030] Another aspect of the present invention is to provide a method for preparing the toughened and reinforced filling material for seismic isolation, comprising the following steps:

[0031] (1) weighing the component A, the component B and the component C in proportion and setting aside;

[0032] (2) taking a portion of the component A for ultrasonic dispersion, mixing it with the ultrasonically dispersed component C, stirring and mixing at 58-60° C., cooling to room temperature, adding the component B, ultrasonically dispersing it at room temperature, and then adding the remaining component A, stirring and dispersing it at 400-500 rpm, and molding it into a mold for 120-168 hours to obtain the product.

[0033] The beneficial effects of the present invention are:

[0034] The present invention provides a filling material for seismic isolation, which adopts a reinforcing component A containing modified boron nitride microfibers, a toughening component B with excellent toughening performance, and a toughening reinforcing component C containing modified silicon dioxide nanotubes, and prepares a tunnel seismic isolation filling material with high strength, high elasticity and high toughness through a room temperature curing reaction. Specifically, the present invention combines the reinforcing component A containing rigid modified boron nitride microfibers with a diol chain extender capable of undergoing a Diels-Alder reversible addition reaction, a toughening component B with excellent toughening performance, and a toughening reinforcing component C containing both soft and hard segment molecular structures and surface containing The reinforcing and toughening component C of the modified silica nanotubes with amino functional groups is effectively combined to form a unique composite toughening and strengthening system with soft and hard segment microphase separation. During the room temperature curing and molding process, the synergistic reinforcing and toughening capabilities of different components can be effectively exerted, thereby improving the overall mechanical properties of the material. The filling material of the present invention can maintain stable energy dissipation and elastic modulus of 20-100 cycles of compression under 100 cycles of 20%-30% strain amplitude testing, and can fully recover after the compressive stress is removed, and has good strength, elasticity, toughness and fatigue resistance. DETAILED DESCRIPTION

[0035] The present invention is further described in conjunction with the following examples.

[0036] Example 1

[0037] A toughened and reinforced filling material for seismic isolation, comprising component A, component B and component C, wherein:

[0038] The preparation method of component A comprises the following steps:

[0039] A1. Take 5.5 kg of boron nitride, ball mill for 36 hours at a speed of 350 rpm and automatically change the rotation direction every 30 minutes, wash with distilled water, vacuum dry at 80 ° C for 24 hours to obtain 5.3 kg of short-cut boron nitride, add 30 L of distilled water and stir to make it uniformly dispersed, adjust the pH value of the system to 8-9 with 20 wt% sodium hydroxide aqueous solution, add 35 g of sodium hexametaphosphate, continue stirring for 6 hours, ultrasonicate in a 40 kHz, 400 W ultrasonic cleaner at room temperature for 3 hours, centrifuge at 350 rpm for 5 minutes, discard the lower layer of solid, centrifuge at 2000 rpm for 20 minutes, collect the precipitate for use;

[0040] The boron nitride is a commercially available product, and its main specifications are: properties: white fibrous powder; content: 99.9%; average diameter: 160nm; average length: 23μm; specific surface area: 19m 2 / g; vacuum dried before use;

[0041] A2. Take the precipitate separated in step A1, ultrasonically disperse it in a Tween 20 aqueous solution with a pH of 8 and a concentration of 10%, and ultrasonically disperse it for 3.5 hours. Filter and separate the precipitate, wash it with water, and vacuum dry it at 75°C for 24 hours to obtain 4.9 kg of purified modified short-cut boron nitride with an average length of 3.4 μm;

[0042] The Tween 20 is commercially available, and its main specifications are as follows: properties: light yellow viscous liquid; active matter: 98-99%; HLB value: 16.7; saponification value (KOHmg / g): 40-50; hydroxyl value (KOHmg / g): 80-108; acid value (KOHmg / g): ≤1.0; moisture (%): ≤1.0;

[0043] A3, ultrasonically dispersing the modified short-cut boron nitride in 40 kg of hexamethylene diisocyanate for 3.5 h, and continuing stirring for 4 h to obtain 44.9 kg of the component A, which is a white liquid slurry containing uniformly dispersed solid particles;

[0044] The hexamethylene diisocyanate is a colorless transparent liquid; the effective ingredient content is 99%; the density (25°C, g / ml):

[0045] 1.01; refractive index (n20D): 1.453; boiling point: 255℃ / 760mmHg;

[0046] The preparation method of component B comprises the following steps:

[0047] B1, 3.2kg of maleic anhydride was dissolved in 4.5L of ethyl acetate, stirred at room temperature (25°C) for 4h, 2.3kg of furan was added, and the mixture was stirred for reaction at room temperature for 36h, 7.2L of petroleum ether was added and stirred, and the mixture was stirred for 3.5h, the precipitate was separated and washed with petroleum ether, and the precipitate was vacuum dried at 45°C for 24h to obtain 4.3kg of white powder, the white powder was dissolved in 9.6L of methanol, stirred at 20°C for 1.5h, and then stirred at 0-2°C for 3h to cool, 3.7L of methanol solution containing 1.92kg of ethanolamine was added dropwise under stirring, and the addition time was 3h. After the addition was completed, the mixture was stirred for reaction at room temperature for 12h, and the stirring reaction was continued at 98-100°C for 30h. After the reaction was completed, the mixture was allowed to stand and cool at -25°C for 24h, the precipitate was separated and washed with petroleum ether, and vacuum dried at 45°C for 24h to obtain 3.79kg of light yellow powder;

[0048] B2, add 3.2 kg of the light yellow powder obtained in step B1 into 35 L of xylene, stir at 125-127 ° C, cool and stand for 24 hours, separate and remove the yellow oily liquid at the bottom, collect the remaining liquid, stand and cool at -20 ° C for 36 hours, separate the precipitate and wash with petroleum ether, and vacuum dry at 45 ° C for 12 hours to obtain 2.4 kg of light yellow powder;

[0049] B3, 2.4 kg of the light yellow powder product obtained in step B2 and 1.8 kg of 3-furan methanol were added to 21.5 L of methanol, stirred and reacted at 78-80 ° C for 18 hours, cooled to room temperature, and then allowed to stand and cool at -25 ° C for 30 hours, solid-liquid separation was performed to obtain a yellow precipitate, the yellow precipitate was added to 32 L of ethyl acetate, stirred and mixed at 48-50 ° C for 5 hours, the precipitate was separated, and vacuum dried at 50 ° C for 24 hours to obtain 2.8 kg of component B in the form of light yellow powder;

[0050] The ethyl acetate, xylene, maleic anhydride, ethanolamine, ethyl acetate, furan, petroleum ether, 3-furan methanol and methanol are all commercially available chemically pure products;

[0051] The preparation method of component C comprises the following steps:

[0052] C0. Take two identical 6L nylon jars, put 30 stainless steel balls with a diameter of 5mm and 25 stainless steel balls with a diameter of 10mm into each jar, add 2.3kg of silica nanotubes to each jar, add 300ml of anhydrous ethanol to each jar, and seal them with nylon caps; put the two jars symmetrically into a planetary ball mill, and mill for 18h at a speed of 400rpm and automatically change the rotation direction every 30min;

[0053] The silicon dioxide nanotubes are commercially available, and their main specifications are: purity: >96%; length: 2-5 μm; tube diameter: 100-400 nm; specific surface area: >600 (m 2 / g);

[0054] C1, adding the silica nanotubes obtained in step C0 to a Tween 40 aqueous solution with a pH of 8 and a concentration of 25wt%, ultrasonically cleaning it in a 40kHz, 400W ultrasonic cleaning machine for 3h, filtering and separating the precipitate, washing it with water, vacuum drying it at 63-65°C for 24h, and then adding it to 30L of a 28wt% sodium hydroxide aqueous solution, stirring and dispersing it for 24h, filtering and separating the precipitate, washing it with water, ultrasonically dispersing it in water for 1h, centrifuging it at 1000rpm for 10min, discarding the lower layer of solid, and centrifuging it at 6500rpm for 20min, collecting the precipitate, adding the precipitate to 32L of a 20wt% hydrogen peroxide solution, stirring and dispersing it for 24h, filtering and separating the precipitate, washing it with water, and vacuum drying it at 58-60°C for 24h, to obtain 3.9kg of silica nanotubes with hydroxyl groups on the surface after purification;

[0055] The Tween 40 is a commercially available amber oily liquid, and its main physical and chemical indicators are: HLB value: 15.5; hydroxyl value (KOHmg / g): 85-100; acid value (KOHmg / g): ≤2.0; saponification value (KOHmg / g): 40-55; moisture (%): ≤2.5;

[0056] C2, 3.9 kg of the silica nanotubes prepared in step C1 were mixed with 12.4 L of γ-aminopropyltriethoxysilane and 0.12 kg of anhydrous sodium carbonate, and the mixture was stirred and reacted at 80° C. for 30 h. After the reaction was completed, the mixture was cooled to room temperature, centrifuged at 7000 rpm for 30 min, the precipitate was separated and washed with anhydrous ethanol and tetrahydrofuran, respectively, and vacuum dried at 25° C. for 15 h to obtain 3.6 kg of activated silica nanotubes with amino groups on the surface, which were in the form of white powder;

[0057] C3, adding 3.6 kg of the silica nanotubes prepared in step C2 to 37.2 kg of the polymer polyol, ultrasonicating at room temperature for 3 h, stirring at 36° C. for 7 h, and cooling to room temperature to obtain 40.8 kg of the component C in the form of a white slurry;

[0058] The polymer polyol is a commercially available colorless oily liquid, and its main physical and chemical indicators are: molecular weight: 4000; functionality: 2; hydroxyl value: 27-29; viscosity: 800-1000; acid value: ≤0.05; water content: ≤0.02;

[0059] The anhydrous ethanol, sodium hydroxide, tetrahydrofuran, γ-aminopropyltriethoxysilane and anhydrous sodium carbonate are all commercially available chemically pure products;

[0060] The method for preparing the toughened and reinforced filling material for seismic isolation comprises the following steps:

[0061] (1) Weigh the components in proportion, and calculate by mass: 23 parts of component A, 10 parts of component B, and 40 parts of component C, and set aside;

[0062] (2) Take 3 / 5 of the mass of the component A, ultrasonically disperse it at room temperature for 3.5 hours, mix it with the component C that has been ultrasonically dispersed for 4 hours, stir and mix it at 58-60°C for 3 hours, cool it to room temperature, add the component B, ultrasonically disperse it at room temperature for 2.5 hours, then add the remaining 2 / 5 of the component A, stir and disperse it at a high speed of 500 rpm for 12 minutes, put it into a mold and form it at room temperature for 168 hours to obtain the product.

[0063] Example 2

[0064] A toughened and reinforced filling material for seismic isolation, comprising component A, component B and component C. The preparation methods of the components A, B and C are the same as those in Example 1. The preparation method of the toughened and reinforced filling material for seismic isolation comprises the following steps:

[0065] (1) Weigh the components in proportion, namely, 17 parts of component A, 8 parts of component B and 30 parts of component C by mass, and set aside;

[0066] (2) Take 3 / 5 of the mass of the component A, ultrasonically disperse it at room temperature for 2.5 hours, mix it with the component C that has been ultrasonically dispersed for 3 hours, stir and mix it at 58-60°C for 2 hours, cool it to room temperature, add the component B, ultrasonically disperse it at room temperature for 2 hours, then add the remaining 2 / 5 of the component A, stir and disperse it at high speed at 450 rpm for 8 minutes, put it into a mold and form it at room temperature for 140 hours to obtain the product.

[0067] Example 3

[0068] A toughened and reinforced filling material for seismic isolation, comprising component A, component B and component C. The preparation methods of the components A, B and C are the same as those in Example 1. The preparation method of the toughened and reinforced filling material for seismic isolation comprises the following steps:

[0069] (1) Weigh the components in proportion, namely, 14 parts of component A, 5 parts of component B and 25 parts of component C by mass, and set aside;

[0070] (2) Take 3 / 5 of the mass of the component A, ultrasonically disperse it at room temperature for 2 hours, mix it with the component C that has been ultrasonically dispersed for 2 hours, stir and mix it at 58-60°C for 1.5 hours, cool it to room temperature, add the component B, ultrasonically disperse it at room temperature for 1.5 hours, then add the remaining 2 / 5 of the component A, stir and disperse it at a high speed of 400 rpm for 6 minutes, put it into a mold and form it at room temperature for 120 hours to obtain the product.

[0071] Example 4

[0072] A toughened and reinforced filling material for seismic isolation, comprising component A, component B and component C. The preparation methods of the components A, B and C are the same as those in Example 1. The preparation method of the toughened and reinforced filling material for seismic isolation comprises the following steps:

[0073] (1) Weigh the components in proportion, namely, 20 parts of component A, 7 parts of component B and 35 parts of component C by mass, and set aside;

[0074] (2) Take 3 / 5 of the mass of the component A, ultrasonically disperse it at room temperature for 3 hours, mix it with the component C that has been ultrasonically dispersed for 3.5 hours, stir and mix it at 58-60°C for 2.5 hours, cool it to room temperature, add the component B, ultrasonically disperse it at room temperature for 2.5 hours, then add the remaining 2 / 5 of the component A, stir and disperse it at high speed at 460 rpm for 10 minutes, put it into a mold for molding at room temperature for 155 hours, and obtain the product.

[0075] Experimental example

[0076] The mechanical properties of the toughened and reinforced filling materials for seismic isolation described in Examples 1-4 were tested, and the test results are shown in Table 1.

[0077] (1) Compressive strength and ultimate compressive failure strain

[0078] Test method: Referring to GB / T 506-2005 "Test method for strength of cement mortar", the uniaxial compression test was carried out using a 30-ton universal mechanical testing machine. The test adopted displacement control and the loading rate of the testing machine was 0.2mm / min.

[0079] Specimen size: 70.7×70.7×70.7mm.

[0080] (2) Elastic modulus

[0081] The test method is the same as (1) the test method for compressive strength.

[0082] Specimen size: 70.7×70.7×70.7mm.

[0083] (3) 100-cycle compression performance

[0084] Test method: The uniaxial cyclic compression test was carried out using a 30-ton universal mechanical testing machine. The test adopted a displacement control method with a loading range of ε=20%-30%. 100 cycles were performed, and each cycle included a loading and unloading. The loading and unloading rates were 4mm / min, and the load-displacement data were collected by computer.

[0085] Specimen size: 70.7×70.7×70.7mm.

[0086] (4) Tensile strength and elongation at break

[0087] Test method: Refer to GB 9641-1988 "Test method for tensile properties of rigid foam plastics", use a 5-ton universal testing machine, adopt displacement control, and the loading rate of the testing machine is 5mm / min.

[0088] Specimen size: dumbbell-shaped specimen, specimen thickness is 10mm, width is 40mm, the distance between the two end clamps is 100mm; the gauge length of the middle tensile section is 50mm and the width is 25mm.

[0089] Table 1 Mechanical properties of toughened and reinforced filling materials for seismic isolation described in Examples 1-4

[0090]

[0091] The mechanical property test results show that the toughened and reinforced filling material for seismic isolation prepared in the embodiment of the present invention has a compressive strength of 17.2-24.2 MPa, which is higher than that of traditional elastomeric rubber (the compressive strength of butyl rubber with a hardness of 70 is 14.7 MPa, and the elastic modulus is 2-4 MPa), the ultimate compression failure strain is 57.6-67.4%, the elastic modulus is 6.3-11.9 MPa, the tensile strength is 7.3-10.0 MPa, and the elongation at break is 20.6-61.0%; under 100 cycles of 20%-30% strain amplitude cyclic compression tests, the energy dissipation and elastic modulus of 20-100 cycles of compression can remain stable, the material can be completely restored after the compressive stress is removed, and is a high-toughness and high-elasticity material, which can be used in underground engineering fields such as tunnel seismic isolation, and has good application prospects.

[0092] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention, rather than to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the present invention.

Claims

1. A toughened and reinforced filling material for seismic isolation, characterized in that: It comprises component A, component B and component C, wherein: The preparation method of component A comprises the following steps: A1. Disperse chopped boron nitride in water, adjust the pH to alkaline, add sodium hexametaphosphate, stir and mix, perform ultrasonic treatment, centrifuge at low speed to separate the supernatant, and then centrifuge at high speed to separate the precipitate for standby use; A2, taking the precipitate separated in step A1, ultrasonically dispersing it in an alkaline Tween 20 aqueous solution, separating the precipitate, washing it with water, and drying it to obtain modified chopped boron nitride; A3, ultrasonically dispersing the modified chopped boron nitride in hexamethylene diisocyanate to obtain a uniform white slurry to obtain the component A; The preparation method of component B comprises the following steps: B1. Dissolve maleic anhydride in ethyl acetate, add furan, stir and react at room temperature for 32-36 hours, add petroleum ether and stir to mix, separate the precipitate and wash with petroleum ether, dry the precipitate and dissolve it in methanol, add methanol solution of ethanolamine dropwise at 0-2°C with stirring, stir and react at room temperature for 12 hours after the dropwise addition is completed, continue to stir and react at 63-65°C for 30 hours, and after the reaction is completed, let it stand and cool at -25°C to -20°C, separate the precipitate and wash with petroleum ether, and dry; B2, adding the precipitate dried in step B1 into xylene, stirring at 125-127°C, cooling and standing, separating and removing the yellow oily liquid at the bottom, collecting the remaining liquid, standing and cooling at -25°C--20°C, separating the precipitate and washing it with petroleum ether, and drying the precipitate to obtain a light yellow powder product; B3, adding the light yellow powder product and 3-furanmethanol into methanol, stirring and reacting at 63-65°C for 15-18h, cooling at -25°C to -20°C, separating the precipitate and adding it into ethyl acetate, stirring and mixing at 48-50°C, separating the precipitate, and drying to obtain the component B; The preparation method of component C comprises the following steps: C1. Ultrasonic dispersion of silica nanotubes in an alkaline Tween 40 aqueous solution, separation of precipitates, washing with water, drying, stirring and dispersion in a sodium hydroxide solution, separation of precipitates, washing with water, ultrasonic dispersion in water, low-speed centrifugation to separate supernatant, high-speed centrifugation to separate precipitates, stirring and dispersion of precipitates in a hydrogen peroxide solution, separation of precipitates, washing with water, drying, and standby use; C2. The silica nanotubes obtained in step C1 are mixed with γ-aminopropyltriethoxysilane and anhydrous sodium carbonate, and the mixture is stirred and reacted at 70-80° C. for 20-30 hours. After the reaction is completed, the mixture is cooled, and the precipitate is separated and washed with anhydrous ethanol and tetrahydrofuran respectively. After vacuum drying, the mixture is added to the polymer polyol, and the mixture is fully stirred and mixed to obtain the component C.

2. The toughened and reinforced filling material for seismic isolation according to claim 1, characterized in that: The average length of the short-cut boron nitride in step A1 is 3-4 μm, and the average diameter is 140-180 nm; the rotation speed of the low-speed centrifugation is 300-500 rpm, and the centrifugation time is 5-10 min; the rotation speed of the high-speed centrifugation is 2000-3000 rpm, and the centrifugation time is 10-20 min.

3. The toughened and reinforced filling material for seismic isolation according to claim 1, characterized in that: The mass ratio of the modified short-cut boron nitride to the hexamethylene diisocyanate in step A3 is 1:(8-9).

4. The toughened and reinforced filling material for seismic isolation according to claim 1, characterized in that: The mass ratio of the maleic anhydride to the furan and the ethanolamine in step B1 is (1.6-1.74):(1.1-1.28):

1.

5. The toughened and reinforced filling material for seismic isolation according to claim 1, characterized in that: The mass ratio of the powder product to the 3-furanmethanol in step B3 is 1:(0.7-0.8).

6. The toughened and reinforced filling material for seismic isolation according to claim 1, characterized in that: In step C1, the rotation speed of the low-speed centrifugation is 1000-2000 rpm, and the centrifugation time is 10-20 min; the rotation speed of the high-speed centrifugation is 6000-8000 rpm, and the centrifugation time is 10-20 min; the mass concentration of the hydrogen peroxide solution is 10-20 wt%.

7. The toughened and reinforced filling material for seismic isolation according to claim 1, characterized in that: In step C2, the mass ratio of the silica nanotubes to the γ-aminopropyltriethoxysilane and the anhydrous sodium carbonate is (30-35):(90-100):

1.

8. The toughened and reinforced filling material for seismic isolation according to claim 1, characterized in that: The mass ratio of the precipitate to the polymer polyol in step C3 is (10-12):

1.

9. The toughened and reinforced filling material for seismic isolation according to claim 1, characterized in that: By mass, the composition comprises 14-23 parts of component A, 5-10 parts of component B and 25-40 parts of component C.

10. A method for preparing a toughened and reinforced filling material for seismic isolation according to any one of claims 1 to 9, characterized in that: The following steps are involved: (1) weighing the component A, the component B and the component C in proportion and setting aside; (2) taking a portion of the component A for ultrasonic dispersion, mixing it with the ultrasonically dispersed component C, stirring and mixing at 58-60° C., cooling to room temperature, adding the component B, ultrasonically dispersing it at room temperature, and then adding the remaining component A, stirring and dispersing it at 400-500 rpm, and molding it into a mold for 120-168 hours to obtain the product.

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