Antistatic misfire self-leveling mortar material and preparation method thereof

Abstract

The invention relates to the technical field of self-leveling mortar, in particular to an antistatic misfire self-leveling mortar material and a preparation method thereof. The antistatic misfire self-leveling mortar material comprises the following raw materials in parts by mass: 160-320 parts of a cementing material, 200-400 parts of sand, 10-20 parts of fly ash, 1-10 parts of ash calcium powder, 10-30 parts of antistatic fibers, 110-230 parts of composite fibers, 1-3 parts of a polycarboxylate superplasticizer, 1-2 parts of cellulose ether, 1-4 parts of a retarder, 0.5-1 part of a defoaming agent, 1-2 parts of latex powder, 1-2 parts of a shrinkage reducing agent, 1-2 parts of an early strength agent and 120-180 parts of water. The composite fiber is obtained by performing plasma treatment on basalt fiber, then adding an unfired filler, stirring and performing ultrasonic treatment; the misfire filler is prepared from limestone powder, nano silicon dioxide and a KH550 coupling agent; the mass ratio of the limestone powder to the nano silicon dioxide to the KH550 coupling agent is 100: (1-5): (1-2).

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of self-leveling mortar, and particularly relates to an anti-static non-ignition self-leveling mortar material and a preparation method thereof. BACKGROUND

[0002] As an important material for modern building ground construction, self-leveling mortar is widely used in various construction projects due to its good flow performance and automatic leveling characteristics. Cement-based self-leveling mortar is composed of cement-based binder, fine aggregate, filler and additives, and has excellent fluidity after being stirred with water, and can quickly spread and form a high flatness base. Its high early strength, fast construction speed and low labor intensity make it an important development direction for building ground construction.

[0003] However, self-leveling mortar still has many problems in practical application, especially in flammable and explosive environments, and its safety performance is particularly prominent. Ignition phenomenon is a dangerous phenomenon that may occur when self-leveling mortar is subjected to impact or friction, and its essence is that when a hard object is impacted and rubbed, less energy is lost, and the remaining energy is suddenly gathered in a local particle, causing the energy of the particle to suddenly increase and thus high temperature light appears.

[0004] At the same time, the spark generated by static electricity is also a potential safety hazard, because when objects with different static potentials are close to each other, high voltage breaks the air, causing air molecules to ionize and appear electric arc. If the energy of the electric arc reaches a certain level, an electric spark will be generated, which is extremely easy to cause an explosion or a fire, posing a serious threat to personal safety and property safety.

[0005] The existing self-leveling mortar cannot achieve true self-leveling effect, and the impact resistance of the solidified mortar is insufficient, which is easy to crack or peel off when subjected to external impact, affecting its service life and safety, and the solidified mortar still has a high risk of ignition when subjected to impact or friction, the anti-static performance is unstable, and it cannot meet the safety requirements of flammable and explosive environments.

[0006] These problems seriously limit the application of self-leveling mortar in flammable and explosive environments, high requirement industrial floors and other fields. Therefore, it has become an urgent need to develop a self-leveling mortar material with excellent flow performance, non-ignition, stable anti-static performance and strong impact resistance. SUMMARY

[0007] The present application relates to the technical field of self-leveling mortar, and particularly relates to an anti-static non-ignition self-leveling mortar material and a preparation method thereof.

[0008] An antistatic non-ignition self-leveling mortar material, raw materials of which include, by mass fraction: cementing material 160-320 parts, sand 200-400 parts, fly ash 10-20 parts, lime powder 1-10 parts, antistatic fiber 10-30 parts, composite fiber 110-230 parts, polycarboxylic acid water reducing agent 1-3 parts, cellulose ether 1-2 parts, retarder 1-4 parts, defoaming agent 0.5-1 part, latex powder 1-2 parts, shrinkage reducing agent 1-2 parts, early strength agent 1-2 parts, and water 120-180 parts.

[0009] The composite fiber is obtained by plasma treatment of basalt fiber, then adding non-ignition filler and stirring, and then ultrasonic treatment.

[0010] The non-ignition filler includes limestone powder, nano silicon dioxide, and KH550 coupling agent, and the mass ratio of the limestone powder, nano silicon dioxide, and KH550 coupling agent is 100:1-5:1-2.

[0011] The antistatic fiber is prepared by the following steps: adding graphene, polypyrrole, and dispersant into water and stirring to obtain pretreated graphene; adding cellulose pulp into ionic liquid and stirring to obtain a mixture, adding the pretreated graphene into the mixture and stirring to obtain a mixture, and melt extruding the mixture.

[0012] Preferably, the cementing material includes ordinary Portland cement, aluminum sulfate cement, and hard gypsum, and the mass ratio of the ordinary Portland cement, aluminum sulfate cement, and hard gypsum is 40-60:100-200:20-60.

[0013] Preferably, the sand includes coarse sand with a particle size of 0.3-0.6 mm and fine sand with a particle size of 0.1-0.2 mm, and the mass ratio of the coarse sand and the fine sand is 1-2:1-2.

[0014] Preferably, the plasma treatment time is 5-10 min, and the plasma treatment working gas is air; during the plasma treatment, the air flow is 0.3-3 L / min, and the discharge power is 200-250 W.

[0015] Preferably, the ionic liquid is any one of 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl) imide ionic liquid, 1-butyl-3-methylimidazolium chloride ionic liquid, 1-allyl-3-methylimidazolium chloride ionic liquid, 1-(2-hydroxyethyl)-3-methylimidazolium chloride ionic liquid, and 1-ethyl-3-methylimidazolium chloride ionic liquid.

[0016] More preferably, the mass ratio of the graphene, polypyrrole, dispersant, cellulose pulp, and ionic liquid is 1-3:1-2:1-2:10-20:30-50.

[0017] More preferably, the dispersant is polyvinylpyrrolidone.

[0018] Preferably, the defoaming agent is a polyether defoaming agent.

[0019] Preferably, the retarder is sodium gluconate.

[0020] Preferably, the early strength agent is lithium sulfate.

[0021] Preferably, the cellulose ether includes at least one of hydroxypropyl methyl cellulose ether and hydroxyethyl methyl cellulose ether.

[0022] Preferably, the latex powder is ethylene-vinyl acetate copolymer powder.

[0023] The preparation method of the above-mentioned antistatic non-ignition self-leveling mortar material comprises the following steps: S1, stirring the cementing material, sand, fly ash, anti-static fiber and lime powder for 1-5 minutes to obtain a mixture; S2, stirring the polycarboxylic acid water reducing agent, cellulose ether, retarder, defoaming agent, latex powder, shrinkage reducing agent and early strength agent for 1-3 minutes, adding the mixture and composite fiber and continuing to stir for 1-3 minutes, and then adding water and stirring for 1-3 minutes.

[0024] Beneficial effects: The present application adopts ordinary Portland cement and low-alkalinity aluminum sulfate cement for compounding, and the aluminum sulfate cement can generate colloid with cement hydration products in the mortar, which can not only fill the micro-cracks generated in the cement hardening process, significantly improve the density and impermeability of the material, but also effectively prevent the damage of alkali-aggregate reaction, ensure the early strength development and improve the long-term durability.

[0025] In the non-ignition filler used in the present application, the surface of the limestone powder is coated with KH550 coupling agent and combined with nano-silicon dioxide, the introduction of nano-silicon dioxide can enhance the toughness and deformation ability of limestone powder, so that it can absorb energy through plastic deformation when impacted, avoiding local energy accumulation to produce high temperature ignition; at the same time, the KH550 coupling agent improves the interface bonding between inorganic filler and organic matrix, and improves the overall impact resistance.

[0026] In the present application, basalt fibers are treated by low-temperature plasma, not only the specific surface area is significantly increased, but also active groups such as hydroxyl and carbonyl groups are introduced, and the bonding strength with non-ignition filler is significantly improved, forming a three-dimensional network in the mortar, which can not only effectively prevent static accumulation, but also enhance the interface bonding between fibers and matrix, and greatly improve the impact resistance of the composite material.

[0027] The anti-static fiber used in the application is compounded by graphene and polypyrrole, graphene provides a continuous conductive path, realizes rapid conduction of electric charge, and cooperates with polypyrrole to enhance the conductive stability, the compound of the two makes the surface resistance of the fiber low and the conductive performance stable. The anti-static fiber cooperates with the composite fiber to form a fiber skeleton in the mortar, which significantly improves the stability of the material anti-static performance. Through optimization of the particle size distribution and the additive system, the flow degree of the material can reach 180±5mm, meeting the self-leveling construction requirements without manual assisted leveling; at the same time, the impact resistance is excellent, the ignition risk is low, the anti-static performance is stable, and the safety requirements of flammable and explosive environment can be met. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 The flow degree comparison chart of the self-leveling mortar material obtained in example 5, comparative examples 1-3.

[0029] Figure 2 The compressive strength comparison chart of the self-leveling mortar material obtained in example 5, comparative examples 1-3.

[0030] Figure 3 The flexural strength comparison chart of the self-leveling mortar material obtained in example 5, comparative examples 1-3.

[0031] Figure 4 The surface resistance comparison chart of the self-leveling mortar material obtained in example 5, comparative examples 1-3. DETAILED DESCRIPTION

[0032] The application will be further described below in combination with specific examples.

[0033] The content of calcium hydroxide in the lime powder used below is not less than 92%, and the particle size is 150-300 mesh. The polycarboxylic acid water reducing agent SPT-160UX used below is purchased from Guangzhou Superplastic Building Materials Co., Ltd. The polyether defoaming agent used below is purchased from Shandong Ludery New Material Co., Ltd. The ethylene-vinyl acetate copolymer latex powder used below is purchased from Shandong Fuliyuan Chemical Co., Ltd. The shrinkage reducing agent used below is purchased from Nanjing Xinyi Synthetic Technology Co., Ltd., and the model is ASA815. The basalt fiber used below has a length of 6mm.

[0034] Example 1 An anti-static non-ignition self-leveling mortar material, the raw materials of which include: cementing material 16kg, sand 20kg, I-grade fly ash 1kg, lime powder 100g, anti-static fiber with a diameter of 0.5±0.1mm 1kg, composite fiber 11kg, polycarboxylic acid water reducing agent SPT-160UX 100g, hydroxypropyl methylcellulose ether 100g, sodium gluconate 100g, polyether defoaming agent 50g, ethylene-vinyl acetate copolymer latex powder 100g, shrinkage reducing agent 100g, lithium sulfate 100g, and water 12kg.

[0035] The cementitious material is composed of P·Ⅱ52.5R Portland cement, L·SAC 42.5 low-alkali sulphoaluminate cement, and hard gypsum in a mass ratio of 2:5:1. The sand is composed of coarse sand with a particle size of 0.3-0.6 mm and fine sand with a particle size of 0.1-0.2 mm in a mass ratio of 1:1.

[0036] The composite fiber is obtained by plasma treatment (using air as the working gas, the air flow is 0.5 L / min during the plasma treatment process, and the discharge power is 200 W) of 1 kg of basalt fiber with a diameter of 0.5±0.1 mm for 5 min, followed by adding 10 kg of non-ignition filler and stirring for 5 min at a stirring speed of 100 r / min, and then ultrasonic treatment (ultrasonic frequency of 80 kHz) for 10 min.

[0037] The non-ignition filler is obtained by heating 10 kg of limestone powder to 90℃ to remove moisture, adding 100 g of nano-silicon dioxide and 100 g of KH550 coupling agent to it, grinding at a speed of 1000 r / min for 10 min, cooling to room temperature, and passing through a 200 mesh sieve.

[0038] The anti-static fiber is prepared by the following steps: 100 g of graphene, 100 g of polypyrrole, and 100 g of polyvinylpyrrolidone are added to 500 g of water and stirred uniformly to obtain pretreated graphene; 1 kg of cellulose pulp is added to 3 kg of 1-butyl-3-methylimidazolium chloride ionic liquid and stirred uniformly, 100 g of pretreated graphene is added and stirred uniformly, and then melt extruded by a twin-screw extruder.

[0039] The preparation method of the above-mentioned antistatic non-ignition self-leveling mortar material comprises the following steps: S1, the cementitious material, sand, I-grade fly ash, anti-static fiber, and lime powder are added to a mixer and stirred for 1 min to obtain a mixture; S2, polycarboxylic acid water reducer SPT-160UX, hydroxypropyl methylcellulose ether, sodium gluconate, polyether defoaming agent, ethylene-vinyl acetate copolymer latex powder, shrinkage reducing agent, and lithium sulfate are added to the mixer and stirred for 1 min, the mixture, composite fiber are added and stirred for 1 min, and then water is added and stirred for 1 min.

[0040] Example 2 An antistatic non-firing self-leveling mortar material, raw materials of which include: cementing material 32 kg, sand 40 kg, I-grade fly ash 2 kg, lime powder 1 kg, anti-static fiber with diameter of 0.5±0.1 mm 3 kg, composite fiber 23 kg, polycarboxylic acid water reducing agent SPT-160UX 300 g, hydroxyethyl methyl cellulose ether 200 g, sodium gluconate 400 g, polyether defoaming agent 100 g, ethylene-vinyl acetate copolymer latex powder 200 g, shrinkage reducing agent 200 g, lithium sulfate 200 g, and water 18 kg.

[0041] The cementing material is composed of P·Ⅱ52.5R Portland cement, L·SAC 42.5 low-alkalinity aluminum sulfate cement and hard gypsum in a mass ratio of 3:10:3.

[0042] The composite fiber is obtained by plasma treatment (using air as working gas, air flow during plasma treatment is 3 L / min, discharge power is 250 W) of 3 kg basalt fiber with diameter of 0.5±0.1 mm for 10 min, then adding 20 kg non-firing filler and stirring for 15 min at a stirring speed of 300 r / min, and then ultrasonic treatment (ultrasonic frequency is 90 kHz) for 30 min.

[0043] The non-firing filler is obtained by heating 10 kg limestone powder to 100℃ to remove water, adding 500 g nano-silicon dioxide and 200 g KH550 coupling agent thereto, grinding at a speed of 1500 r / min for 20 min, cooling to room temperature, and then passing through a 250-mesh sieve.

[0044] The anti-static fiber is prepared by the following steps: adding 300 g graphene, 200 g polypyrrole and 200 g polyvinylpyrrolidone into 1000 g water and stirring uniformly to obtain pretreated graphene; adding 2000 g cellulose pulp into 5000 g 1-allyl-3-methylimidazolium chloride ionic liquid and stirring uniformly, adding the pretreated graphene thereto and stirring uniformly, and then adding a twin-screw extruder for melt extrusion.

[0045] The preparation method of the antistatic non-firing self-leveling mortar material, comprising the following steps: S1, adding the cementing material, sand, I-grade fly ash, anti-static fiber and lime powder into a stirrer and stirring for 5 min to obtain a mixture; S2, adding polycarboxylic acid water reducing agent SPT-160UX, hydroxyethyl methyl cellulose ether, sodium gluconate, polyether defoaming agent, ethylene-vinyl acetate copolymer latex powder, shrinkage reducing agent and lithium sulfate into the stirrer and stirring for 3 min, adding the mixture and composite fiber and continuing to stir for 3 min, and then adding water and stirring for 3 min.

[0046] Example 3 An antistatic non-ignition self-leveling mortar material, raw materials of which include: cementitious material 25.5 kg, sand 36 kg, I-grade fly ash 1200 g, lime powder 700 g, anti-static fiber with diameter of 0.5±0.1 mm 1500 g, composite fiber 20.5 kg, polycarboxylate superplasticizer SPT-160UX 250 g, hydroxypropyl methylcellulose ether 120 g, sodium gluconate 300 g, polyether defoaming agent 60 g, ethylene-vinyl acetate copolymer latex powder 180 g, shrinkage reducing agent 130 g, lithium sulfate 170 g, and water 15 kg.

[0047] The cementitious material is composed of P·Ⅱ 52.5R Portland cement, L·SAC 42.5 low-alkalinity aluminum sulfate cement, and anhydrous calcium sulfate in a mass ratio of 3:12:2. The sand is composed of coarse sand with a particle size of 0.3-0.6 mm and fine sand with a particle size of 0.1-0.2 mm in a mass ratio of 1.7:1.3.

[0048] The composite fiber is obtained by the following steps: 2500 g of basalt fiber with a diameter of 0.5±0.1 mm is subjected to plasma treatment (using air as the working gas, the air flow during plasma treatment is 2.5 L / min, and the discharge power is 230 W) for 7 min, then 18 kg of non-ignition filler is added and stirred for 8 min at a stirring speed of 250 r / min, and then subjected to ultrasonic treatment (ultrasonic frequency is 82 kHz) for 25 min.

[0049] The non-ignition filler is obtained by the following steps: 10 kg of limestone powder is heated to 92℃ to remove moisture, 400 g of nano-silicon dioxide and 150 g of KH550 coupling agent are added thereto, and grinding is carried out at a speed of 1100 r / min for 18 min, then the temperature is lowered to room temperature, and the mixture is sieved through a 210 mesh sieve.

[0050] The anti-static fiber is prepared by the following steps: 250 g of graphene, 120 g of polypyrrole, and 180 g of polyvinylpyrrolidone are added to 700 g of water and stirred uniformly to obtain pretreated graphene; 1800 g of cellulose pulp is added to 3500 g of 1-ethyl-3-methylimidazolium chloride ionic liquid and stirred uniformly, the pretreated graphene is added thereto and stirred uniformly, and then melt extrusion is carried out in a twin-screw extruder.

[0051] The preparation method of the above-mentioned antistatic non-ignition self-leveling mortar material includes the following steps: S1, the cementitious material, sand, I-grade fly ash, anti-static fiber, and lime powder are added to a stirrer and stirred for 4 min to obtain a mixture; S2, polycarboxylic acid water reducing agent SPT-160UX, hydroxypropyl methyl cellulose ether, sodium gluconate, polyether defoaming agent, ethylene-vinyl acetate copolymer latex powder, shrinkage reducing agent, lithium sulfate are added into the blender and stirred for 1.5 min, the mixture, composite fiber is added and stirred for 2.5 min, and then water is added and stirred for 1.5 min.

[0052] Example 4 An antistatic non-firing self-leveling mortar material, raw materials of which include: cementitious material 22.5 kg, sand 24 kg, I-grade fly ash 1800 g, lime powder 300 g, anti-static fiber with a diameter of 0.5±0.1 mm 2500 g, composite fiber 13.5 kg, polycarboxylic acid water reducing agent SPT-160UX 150 g, hydroxyethyl methyl cellulose ether 180 g, sodium gluconate 200 g, polyether defoaming agent 80 g, ethylene-vinyl acetate copolymer latex powder 120 g, shrinkage reducing agent 170 g, lithium sulfate 130 g, and water 15 kg.

[0053] The cementitious material is composed of P·Ⅱ52.5R Portland cement, L·SAC 42.5 low-alkalinity sulfoaluminate cement, and anhydrous calcium sulfate in a mass ratio of 11:24:10. The sand is composed of coarse sand with a particle size of 0.3-0.6 mm and fine sand with a particle size of 0.1-0.2 mm in a mass ratio of 1.2:1.8.

[0054] The composite fiber is obtained by plasma treatment (using air as the working gas, air flow during plasma treatment is 1.5 L / min, discharge power is 210 W) of 1500 g basalt fiber with a diameter of 0.5±0.1 mm for 9 min, followed by stirring with 12 kg non-firing filler at a stirring speed of 150 r / min for 12 min, and then ultrasonic treatment (ultrasonic frequency is 88 kHz) for 15 min.

[0055] The non-firing filler is obtained by heating 10 kg of limestone powder to 98℃ to remove moisture, adding 200 g of nano-silicon dioxide and 150 g of KH550 coupling agent to it, and grinding at a speed of 1300 r / min for 12 min, then cooling to room temperature and passing through a 230 mesh sieve.

[0056] The anti-static fiber is prepared by the following steps: 150 g of graphene, 180 g of polypyrrole, and 120 g of polyvinylpyrrolidone are added to 900 g of water and stirred uniformly to obtain pretreated graphene; 1200 g of cellulose pulp is added to 4500 g of 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl) imide ionic liquid and stirred uniformly, the pretreated graphene is added and stirred uniformly, and then melt extruded by a twin-screw extruder.

[0057] The preparation method of the above-mentioned antistatic non-firing self-leveling mortar material, comprising the following steps: S1, the cementitious material, sand, I-class fly ash, anti-static fiber, ash calcium powder is added to the blender and stirred for 2 min to obtain a mixture; S2, polycarboxylic acid water reducing agent SPT-160UX, hydroxyethyl methyl cellulose ether, sodium gluconate, polyether defoaming agent, ethylene-vinyl acetate copolymer latex powder, shrinkage reducing agent, lithium sulfate is added to the blender and stirred for 2.5 min, the mixture, composite fiber is continuously stirred for 1.5 min, and then water is added and stirred for 2.5 min.

[0058] Example 5 An anti-static non-firing self-leveling mortar material, the raw materials of which include: cementitious material 24 kg, sand 30 kg, I-class fly ash 1500 g, ash calcium powder 500 g, anti-static fiber with a diameter of 0.5±0.1 mm 2 kg, composite fiber 17 kg, polycarboxylic acid water reducing agent SPT-160UX 200 g, hydroxyethyl methyl cellulose ether 100 g, hydroxypropyl methyl cellulose ether 50 g, sodium gluconate 250 g, polyether defoaming agent 70 g, ethylene-vinyl acetate copolymer latex powder 150 g, shrinkage reducing agent 150 g, lithium sulfate 150 g, and water 15 kg.

[0059] The cementitious material is composed of P·Ⅱ 52.5R Portland cement, L·SAC 42.5 low-alkalinity aluminum sulfate cement, and anhydrous calcium sulfate in a mass ratio of 50:150:40. The sand is composed of coarse sand with a particle size of 0.3-0.6 mm and fine sand with a particle size of 0.1-0.2 mm in a mass ratio of 1:2.

[0060] The composite fiber is obtained by plasma treatment (using air as the working gas, air flow during plasma treatment is 2 L / min, discharge power is 220 W) of 2 kg basalt fiber with a diameter of 0.5±0.1 mm for 8 min, followed by addition of 15 kg non-firing filler and stirring for 10 min at a stirring speed of 200 r / min, and then ultrasonic treatment (ultrasonic frequency is 85 kHz) for 20 min.

[0061] The non-firing filler is obtained by heating 10 kg of limestone powder to 95℃ to remove moisture, adding 300 g of nano-silicon dioxide and 150 g of KH550 coupling agent to it, and grinding at a speed of 1200 r / min for 15 min, then cooling to room temperature and passing through a 220 mesh sieve.

[0062] The anti-static fiber is prepared by the following steps: 200 g of graphene, 150 g of polypyrrole, and 150 g of polyvinylpyrrolidone are added to 800 g of water and stirred uniformly to obtain pretreated graphene; 1500 g of cellulose pulp is added to 4000 g of 1-(2-hydroxyethyl)-3-methylimidazole chloride salt ionic liquid and stirred uniformly, the pretreated graphene is added and stirred uniformly, and then a twin-screw extruder is used for melt extrusion.

[0063] The preparation method of the above-mentioned antistatic, non-sparking self-leveling mortar material includes the following steps: S1. Add cementitious materials, sand, Class I fly ash, antistatic fiber, and lime powder to a mixer and stir for 3 minutes to obtain a mixture; S2. Add polycarboxylate superplasticizer SPT-160UX, hydroxyethyl methyl cellulose ether, hydroxypropyl methyl cellulose ether, sodium gluconate, polyether defoamer, ethylene-vinyl acetate copolymer latex powder, shrinkage reducer, and lithium sulfate to a mixer and stir for 2 minutes. Add the mixture and composite fiber and continue stirring for 2 minutes. Then add water and stir for 2 minutes.

[0064] Comparative Example 1 An antistatic, non-sparking self-leveling mortar material comprises the following raw materials: 24 kg of cementitious material, 30 kg of sand, 1500 g of Grade I fly ash, 500 g of lime powder, 2 kg of antistatic fiber with a diameter of 0.5 ± 0.1 mm, 17 kg of composite fiber, 200 g of polycarboxylate superplasticizer SPT-160UX, 100 g of hydroxyethyl methyl cellulose ether, 50 g of hydroxypropyl methyl cellulose ether, 250 g of sodium gluconate, 70 g of polyether defoamer, 150 g of ethylene-vinyl acetate copolymer latex powder, 150 g of shrinkage reducer, 150 g of lithium sulfate, and 15 kg of water.

[0065] The cementitious material is composed of P·Ⅱ52.5R silicate cement, L·SAC 42.5 low-alkalinity aluminum sulfate cement, and anhydrite in a mass ratio of 50:150:40. The sand is composed of coarse sand with a particle size of 0.3-0.6mm and fine sand with a particle size of 0.1-0.2mm in a mass ratio of 1:2.

[0066] The composite fiber is obtained by mixing 2 kg of basalt fiber with a diameter of 0.5±0.1 mm with 15 kg of non-sparking filler for 10 min at a stirring speed of 200 r / min, and then ultrasonically treating it (ultrasonic frequency of 85 kHz) for 20 min.

[0067] The non-sparking filler is made by heating 10 kg of limestone powder to 95°C to remove moisture, adding 300 g of nano silica and 150 g of KH550 coupling agent, grinding at 1200 r / min for 15 min, cooling to room temperature, and passing through a 220 mesh sieve.

[0068] The antistatic fiber is prepared by the following steps: 200g of graphene, 150g of polypyrrole, and 150g of polyvinylpyrrolidone are added to 800g of water and stirred evenly to obtain pretreated graphene; 1500g of cellulose pulp is added to 4000g of chlorinated 1-(2-hydroxyethyl)-3-methylimidazolium salt ionic liquid and stirred evenly; the pretreated graphene is added to the mixture and stirred evenly; and the mixture is then melt-extruded using a twin-screw extruder.

[0069] The preparation method of the antistatic non-ignition self-leveling mortar material comprises the following steps: S1, the cementitious material, sand, I-grade fly ash, anti-static fiber, ash calcium powder are added to the stirrer and stirred for 3 min to obtain a mixture; S2, polycarboxylic acid water reducing agent SPT-160UX, hydroxyethyl methyl cellulose ether, hydroxypropyl methyl cellulose ether, sodium gluconate, polyether defoaming agent, ethylene-vinyl acetate copolymer latex powder, shrinkage reducing agent, lithium sulfate are added to the stirrer and stirred for 2 min, the mixture, composite fiber is continuously stirred for 2 min, and then water is added and stirred for 2 min.

[0070] Comparative example 2 An antistatic non-ignition self-leveling mortar material, the raw materials of which comprise: cementitious material 24 kg, sand 30 kg, I-grade fly ash 1500 g, ash calcium powder 500 g, anti-static fiber with a diameter of 0.5±0.1 mm 2 kg, composite fiber 17 kg, polycarboxylic acid water reducing agent SPT-160UX 200 g, hydroxyethyl methyl cellulose ether 100 g, hydroxypropyl methyl cellulose ether 50 g, sodium gluconate 250 g, polyether defoaming agent 70 g, ethylene-vinyl acetate copolymer latex powder 150 g, shrinkage reducing agent 150 g, lithium sulfate 150 g, and water 15 kg.

[0071] The cementitious material is composed of P·Ⅱ52.5R Portland cement, L·SAC 42.5 low-alkalinity aluminum sulfate cement, and anhydrous calcium sulfate in a mass ratio of 50:150:40. The sand is composed of coarse sand with a particle size of 0.3-0.6 mm and fine sand with a particle size of 0.1-0.2 mm in a mass ratio of 1:2.

[0072] The composite fiber is obtained by plasma treatment (using air as the working gas, air flow during plasma treatment is 2 L / min, discharge power is 220 W) of 2 kg basalt fiber with a diameter of 0.5±0.1 mm for 8 min, then adding 14.354 kg limestone powder, 430.6 g nano silicon dioxide, and 215.4 g KH550 coupling agent and stirring for 10 min at a stirring speed of 200 r / min, and then ultrasonic treatment (ultrasonic frequency is 85 kHz) for 20 min.

[0073] The anti-static fiber is prepared by the following steps: 200 g of graphene, 150 g of polypyrrole, and 150 g of polyvinylpyrrolidone are added to 800 g of water and stirred uniformly to obtain pretreated graphene; 1500 g of cellulose pulp is added to 4000 g of 1-(2-hydroxyethyl)-3-methylimidazole chloride ionic liquid and stirred uniformly, the pretreated graphene is added and stirred uniformly, and then a twin-screw extruder is used for melt extrusion.

[0074] The preparation method of the antistatic non-ignition self-leveling mortar material comprises the following steps: S1, the cementitious material, sand, I-grade fly ash, antistatic fiber, and lime powder are added into a mixer and stirred for 3 min to obtain a mixture; S2, the polycarboxylic acid water reducing agent SPT-160UX, hydroxyethyl methyl cellulose ether, hydroxypropyl methyl cellulose ether, sodium gluconate, polyether defoaming agent, ethylene-vinyl acetate copolymer latex powder, shrinkage reducing agent, and lithium sulfate are added into the mixer and stirred for 2 min, the mixture and the composite fiber are continuously stirred for 2 min, and then water is added and stirred for 2 min.

[0075] Comparative Example 3 An antistatic non-ignition self-leveling mortar material, raw materials of which comprise: cementitious material 24 kg, sand 30 kg, I-grade fly ash 1500 g, lime powder 500 g, antistatic fiber with a diameter of 0.5±0.1 mm 2 kg, composite fiber 17 kg, polycarboxylic acid water reducing agent SPT-160UX 200 g, hydroxyethyl methyl cellulose ether 100 g, hydroxypropyl methyl cellulose ether 50 g, sodium gluconate 250 g, polyether defoaming agent 70 g, ethylene-vinyl acetate copolymer latex powder 150 g, shrinkage reducing agent 150 g, lithium sulfate 150 g, and water 15 kg.

[0076] The cementitious material is composed of P·Ⅱ 52.5R Portland cement, L·SAC 42.5 low-alkalinity aluminum sulfate cement, and hard gypsum in a mass ratio of 50:150:40. The sand is composed of coarse sand with a particle size of 0.3-0.6 mm and fine sand with a particle size of 0.1-0.2 mm in a mass ratio of 1:2.

[0077] The composite fiber is obtained by the following steps: 2 kg of basalt fiber with a diameter of 0.5±0.1 mm is subjected to plasma treatment (using air as the working gas, the air flow during the plasma treatment process is 2 L / min, and the discharge power is 220 W) for 8 min, then 15 kg of non-ignition filler is added and stirred for 10 min at a stirring speed of 200 r / min, and then ultrasonic treatment (ultrasonic frequency is 85 kHz) is performed for 20 min.

[0078] The non-ignition filler is obtained by the following steps: 10 kg of limestone powder is heated to 95℃ to remove water, 300 g of nano-silicon dioxide and 150 g of KH550 coupling agent are added thereto, and grinding is performed at a speed of 1200 r / min for 15 min, then the temperature is lowered to room temperature, and then the mixture is passed through a 220-mesh sieve.

[0079] The anti-static fiber is prepared by the following steps: 200 g of graphene, 150 g of polyvinylpyrrolidone are added into 800 g of water and stirred uniformly to obtain pretreated graphene; 1500 g of cellulose pulp is added into 4000 g of 1-(2-hydroxyethyl)-3-methylimidazolium chloride ionic liquid and stirred uniformly, the pretreated graphene is added and stirred uniformly, and then a twin-screw extruder is used for melt extrusion, and then 150 g of polypyrrole is uniformly mixed.

[0080] The preparation method of the anti-static non-sparking self-leveling mortar material, comprising the following steps: S1, the cementitious material, sand, I-grade fly ash, anti-static fiber, and lime powder are added into a mixer and stirred for 3 min to obtain a mixture; S2, polycarboxylic acid water reducer SPT-160UX, hydroxyethyl methyl cellulose ether, hydroxypropyl methyl cellulose ether, sodium gluconate, polyether defoaming agent, ethylene-vinyl acetate copolymer latex powder, shrinkage reducing agent, and lithium sulfate are added into the mixer and stirred for 2 min, the mixture and the composite fiber are continuously stirred for 2 min, and then water is added and stirred for 2 min.

[0081] The flow degree, compressive strength (24 h and 28 d), flexural strength (24 h and 28 d), and impact resistance of the self-leveling mortar materials obtained in Example 5 and Comparative Examples 1-3 are determined according to JC / T 985-2017 “Cement-based self-leveling mortar for ground”.

[0082] As shown in Figure 1 , the self-leveling mortar material obtained in Example 5 has the highest flow degree and is better than Comparative Examples 1-3 (P<0.05), which proves that the self-leveling mortar material obtained in the application meets the self-leveling construction requirements and does not need manual assistance for leveling.

[0083] As shown in Figure 2 and Figure 3 , the self-leveling mortar material obtained in Example 5 has the highest compressive strength and flexural strength and is better than Comparative Examples 1-3 (P<0.05).

[0084] During the impact resistance test, the self-leveling mortar materials obtained in Example 5 and Comparative Examples 2-3 do not show cracking or peeling off the base plate.

[0085] The non-sparking property and anti-static property of the self-leveling mortar materials obtained in Example 5 and Comparative Examples 1-3 are tested according to JC / T 2653-2022 “Non-sparking mortar”.

[0086] Among them, the self-leveling mortar materials obtained in Example 5, Comparative Example 1, and Comparative Example 3 do not show sparks. As shown in Figure 4 , the self-leveling mortar material obtained in Example 5 has the lowest surface resistance, indicating that the self-leveling mortar material obtained in the application has the best anti-static property.

[0087] The reason for the above results is that in the non-ignition filler used in the present application, the surface of the limestone powder is coated with KH550 coupling agent and combined with nano-silicon dioxide. The introduction of nano-silicon dioxide can enhance the toughness and deformation ability of limestone powder, so that it can absorb energy through plastic deformation when impacted, avoiding local energy accumulation to produce high temperature ignition. At the same time, the KH550 coupling agent improves the interface bonding between inorganic fillers and organic matrix, and improves the overall impact resistance. In the present application, basalt fibers are treated by low-temperature plasma, not only the specific surface area is significantly increased, but also active groups such as hydroxyl and carbonyl groups are introduced, and the bonding strength with non-ignition filler is significantly improved, forming a three-dimensional network in the mortar, which can effectively prevent static electricity accumulation, and can also enhance the interface bonding between fibers and matrix, greatly improving the impact resistance of the composite material. At the same time, in the anti-static fiber used in the present application, graphene and polypyrrole are compounded, graphene provides a continuous conductive path to realize rapid charge conduction, and polypyrrole enhances the conductivity stability, and the combination of the two makes the surface resistance of the fiber low and the conductivity stable. The anti-static fiber and the composite fiber form a fiber skeleton in the mortar, which significantly improves the stability of the material's anti-static performance.

[0088] The above is only the preferred specific embodiment of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art can make equivalent replacements or changes within the technical range disclosed in the present application according to the technical solution and inventive concept of the present application, which should be covered within the protection scope of the present application.

Claims

1. An antistatic, non-sparking self-leveling mortar material, characterized in that, The raw materials, by weight, include: 160-320 parts of cementitious materials, 200-400 parts of sand, 10-20 parts of fly ash, 1-10 parts of hydrated lime powder, 10-30 parts of antistatic fiber, 110-230 parts of composite fiber, 1-3 parts of polycarboxylate superplasticizer, 1-2 parts of cellulose ether, 1-4 parts of retarder, 0.5-1 part of defoamer, 1-2 parts of latex powder, 1-2 parts of shrinkage reducer, 1-2 parts of early strength agent, and 120-180 parts of water. The composite fiber is obtained by plasma treatment of basalt fiber, followed by stirring with non-sparking filler, and then ultrasonic treatment; the mass ratio of basalt fiber to non-sparking filler is 1-3:10-20. The non-sparking filler includes: limestone powder, nano silica, and KH550 coupling agent; the mass ratio of limestone powder, nano silica, and KH550 coupling agent is 100:1-5:1-2. The antistatic fiber is prepared by the following steps: graphene, polypyrrole, and dispersant are added to water and stirred evenly to obtain pretreated graphene; cellulose pulp is added to ionic liquid and stirred evenly, pretreated graphene is added to it and stirred evenly, and then melt-extruded.

2. The antistatic, non-sparking self-leveling mortar material according to claim 1, characterized in that, The cementing materials include: ordinary Portland cement, aluminum sulfate cement, and anhydrite, with a mass ratio of 40-60:100-200:20-60.

3. The antistatic, non-sparking self-leveling mortar material according to claim 1, characterized in that, The sand includes coarse sand with a particle size of 0.3-0.6 mm and fine sand with a particle size of 0.1-0.2 mm, with a mass ratio of coarse sand to fine sand of 1-2:1-2.

4. The antistatic, non-sparking self-leveling mortar material according to claim 1, characterized in that, The plasma treatment time is 5-10 minutes, and the working gas for plasma treatment is air. The air flow rate during plasma treatment is 0.3-3 L / min, and the discharge power is 200-250 W.

5. The antistatic, non-sparking self-leveling mortar material according to claim 1, characterized in that, The ionic liquid is any one of the following: 1-ethyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imine salt ionic liquid, 1-butyl-3-methylimidazolium chloride ionic liquid, 1-allyl-3-methylimidazolium chloride ionic liquid, 1-(2-hydroxyethyl)-3-methylimidazolium chloride ionic liquid, and 1-ethyl-3-methylimidazolium chloride ionic liquid.

6. The antistatic, non-sparking self-leveling mortar material according to claim 5, characterized in that, The mass ratio of graphene, polypyrrole, dispersant, cellulose pulp, and ionic liquid is 1-3:1-2:1-2:10-20:30-50.

7. The antistatic, non-sparking self-leveling mortar material according to claim 5, characterized in that, The dispersant is polyvinylpyrrolidone.

8. The antistatic, non-sparking self-leveling mortar material according to claim 1, characterized in that, The defoamer is a polyether defoamer; the retarder is sodium gluconate; and the early strength agent is lithium sulfate.

9. The antistatic, non-sparking self-leveling mortar material according to claim 1, characterized in that, Cellulose ethers include at least one of hydroxypropyl methylcellulose ether and hydroxyethyl methylcellulose ether; the latex powder is ethylene-vinyl acetate copolymer powder.

10. A method for preparing an antistatic, non-sparking self-leveling mortar material as described in any one of claims 1-9, characterized in that, Includes the following steps: S1. Mix the cementitious materials, sand, fly ash, antistatic fiber, and lime powder for 1-5 minutes to obtain a mixture. S2. Stir the polycarboxylate superplasticizer, cellulose ether, retarder, defoamer, latex powder, shrinkage reducer, and early strength agent for 1-3 minutes. Add the mixture and composite fiber and continue stirring for 1-3 minutes. Then add water and stir for 1-3 minutes.

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