Preparation method and application of inorganic mixture exposed roof waterproof material

Abstract

The application discloses to the technical field of building waterproof material, and particularly relates to a preparation method and application of an inorganic mixture exposed roof waterproof material, which comprises the following specific steps: S1, raw material composition: weighing the raw materials; S2, raw material pretreatment: S21, cementing aggregate pretreatment: placing Portland cement, aluminate cement and quartz sand in a drying device for drying, and cooling to room temperature after drying is completed for standby; S22, fiber pretreatment: placing basalt short fibers and polyvinyl alcohol short fibers in an ultraviolet sterilization box for sterilization, and taking out after sterilization for standby. The application realizes resistance to temperature changes, base deformation and other environmental stress effects, reduces crack generation and avoids rainwater leakage through the synergistic reinforcement of basalt short fibers and polyvinyl alcohol short fibers, and the filling and structure densification optimization of nano-silicon dioxide and metakaolin to the internal pores of the material.

Description

Technical Field

[0001] This invention relates to the field of building waterproofing materials technology, specifically to a method for preparing and applying an inorganic mixture-based waterproofing material for exposed roofs. Background Technology

[0002] Exposed roofs, as a crucial protective structure of buildings, are constantly exposed to natural environments such as ultraviolet radiation, alternating high and low temperatures, rainwater erosion, and freeze-thaw cycles. Therefore, waterproofing materials require extremely high levels of weather resistance, crack resistance, bonding strength, and durability. Inorganic mixture waterproofing materials, due to their advantages such as being environmentally friendly and pollution-free (containing no volatile organic compounds), heat-resistant (not easily flammable), and relatively low cost, are gradually replacing traditional asphalt-based and polymer-based organic waterproofing materials, becoming an important choice for waterproofing exposed roofs.

[0003] However, the inorganic compound exposed roof waterproofing materials currently on the market still have the following key technical problems, which seriously restrict their application effect and service life:

[0004] 1. Poor crack resistance, prone to cracking and leakage due to environmental stress: Traditional inorganic materials (such as ordinary waterproof mortar and inorganic waterproof concrete) are brittle and have high shrinkage rates, making them prone to cracking when temperatures change or the substrate deforms. For example, in 2022, a residential community in northern China used ordinary inorganic waterproof mortar to lay the exposed roof. After experiencing freeze-thaw cycles from -25°C to 5°C in winter, a through crack exceeding 1 meter in length appeared on the roof. Rainwater seeped in, causing mold to grow on the indoor ceiling. Repairs required removing the original waterproof layer and redoing it, with repair costs as high as 380 yuan per square meter and a repair cycle of up to 15 days, seriously affecting the normal lives of residents.

[0005] 2. Insufficient bonding strength with the substrate, prone to peeling and detachment: Existing inorganic waterproofing materials have weak interfacial bonding strength with concrete substrates, making them prone to peeling under long-term rain immersion or external force. For example, the roof of a steel structure factory building built in a southern industrial park in 2021 used a traditional inorganic waterproofing layer bonded to the concrete gutters. Due to the local rainy weather, 30% of the waterproofing layer peeled off from the substrate, allowing rainwater to seep into the factory building along the peeling gaps, causing moisture damage to machinery and equipment worth 500,000 yuan.

[0006] 3. Poor aging resistance and rapid performance degradation with long-term use: Ordinary inorganic materials are prone to surface chalking and structural loosening under long-term ultraviolet radiation, leading to increased water absorption and loss of waterproof performance. For example, the exposed roof of a tourist attraction in Hainan, which was put into use in 2020, used a commercially available inorganic waterproof material. In just two years, the surface chalking level of the roof material reached level 3 (severe chalking, with a large amount of powder falling off when wiped by hand), and the water absorption rate increased from the initial 2.5% to 18%. Frequent application of waterproof repair agent was required during the rainy season, and the annual maintenance cost accounted for 20% of the initial construction cost.

[0007] Based on the above, a method for preparing and applying an inorganic mixture-based waterproofing material for exposed roofs is hereby invented. Summary of the Invention

[0008] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0009] A method for preparing an inorganic mixture waterproofing material for exposed roofs includes the following specific steps:

[0010] S1, Raw material composition: Weigh the raw materials;

[0011] S2, Raw material pretreatment:

[0012] S21, Cementitious / Aggregate Pretreatment: Place silicate cement, aluminate cement, and quartz sand in a drying equipment for drying, and cool to room temperature after drying for later use.

[0013] S22, Fiber pretreatment: Basalt short fibers and polyvinyl alcohol short fibers are placed in an ultraviolet sterilization chamber for sterilization, and are taken out for use after sterilization.

[0014] S23, Nanoparticle Dispersion Treatment: Mix nano-silica with 1 / 3 of the total water volume of deionized water, add 0.1-0.2 parts of polycarboxylate superplasticizer, and place in an ultrasonic disperser for ultrasonic dispersion to form a uniform nano-silica dispersion.

[0015] S24, Fiber Coupling Coating Treatment: Sterilized basalt short fibers and polyvinyl alcohol short fibers are added to a high-speed mixer, and a diluted silane coupling agent solution is sprayed on. The mixture is stirred for 15-20 minutes to make the fiber surface uniformly coated with a coupling agent film.

[0016] S3, Premixing: First, add the pretreated silicate cement, aluminate cement, and quartz sand to a low-speed mixer, then add metakaolin and nano-montmorillonite for the first stirring; then slowly pour in the prepared nano-silica dispersion for the second stirring to obtain a uniform premix.

[0017] S4, Enhanced Mixing: Add the treated basalt short fibers and polyvinyl alcohol short fibers to the premix and stir using a mixer to make the fibers evenly distributed;

[0018] S5, Slurry preparation:

[0019] S51, add the remaining polycarboxylate superplasticizer and silicone defoamer to the reinforcing mixture, then slowly add 2 / 3 of the total water volume of deionized water and stir to obtain a waterproof slurry with an extension of 200-220mm;

[0020] S52, add nano-calcium carbonate to the waterproof slurry, keep the speed constant, and continue stirring for 2 minutes to obtain an inorganic mixture of exposed roof waterproofing material.

[0021] As a preferred embodiment of the method for preparing an inorganic mixture exposed roof waterproofing material according to the present invention, the raw materials in S1 include, by weight: 40-50 parts silicate cement, 10-15 parts aluminate cement, 2-4 parts nano silica, 6-10 parts metakaolin, 0.2-0.4 parts silane coupling agent, 1-3 parts basalt short fiber, 0.5-1.5 parts polyvinyl alcohol short fiber, 15-25 parts quartz sand, 0.3-0.6 parts polycarboxylate superplasticizer, 0.1-0.3 parts organosilicon defoamer, 1-2 parts nano montmorillonite, 8-12 parts deionized water, and 0.5-1 parts nano calcium carbonate.

[0022] In a preferred embodiment of the method for preparing an inorganic mixture exposed roof waterproofing material according to the present invention, the drying time in step S21 is set to 2-3 hours and the drying temperature is set to 105-110°C; the sterilization time in step S22 is set to 30-40 minutes.

[0023] In a preferred embodiment of the method for preparing an inorganic mixture exposed roof waterproofing material according to the present invention, the ultrasonic dispersion time in step S23 is set to 20-30 min; the silane coupling agent solution in step S24 is composed of silane coupling agent and 1-2 parts of deionized water.

[0024] As a preferred embodiment of the method for preparing an inorganic mixture exposed roof waterproofing material according to the present invention, wherein: the first stirring time in step S3 is set to 3-4 min, and the second stirring time is set to 4-6 min.

[0025] In a preferred embodiment of the method for preparing an inorganic mixture exposed roof waterproofing material according to the present invention, the mixer speed in step S4 is set to 1400-1600 r / min, and the stirring time is set to 7-9 min.

[0026] In a preferred embodiment of the method for preparing an inorganic mixture exposed roof waterproofing material according to the present invention, the rotation speed in step S51 is set to 800-1000 r / min, and the stirring time is set to 9-11 min.

[0027] Based on the application of the aforementioned inorganic mixture exposed roof waterproofing material in roof waterproofing construction, the construction process involves first grinding the exposed roof substrate to remove surface dust, oil stains, and loose layers, then cleaning it with a high-pressure water gun. After the substrate moisture content is ≤8%, a layer of interface treatment agent is applied, with the interface agent's drying time controlled within 1-2 hours. Next, the troweling method is used, applying the finished waterproofing material to the substrate in two layers. The first layer is 3-5mm thick, and after the material has initially set, a second layer is applied with a thickness of 5-8mm. The total thickness of the two layers is controlled within 8-13mm. Finally, after construction, watering is used for curing. For the first 3 days, water is sprayed 3-4 times a day, and for the subsequent 4 days, water is sprayed 1-2 times a day, with a total curing time of no less than 7 days. During the curing period, rainwater erosion and foot traffic should be avoided.

[0028] Compared with existing technologies:

[0029] 1. Through the synergistic reinforcement of basalt short fibers and polyvinyl alcohol short fibers, combined with the filling of internal pores and structural densification optimization of nano-silica and metakaolin, it can resist environmental stress such as temperature changes and base deformation, reduce crack generation and prevent rainwater leakage.

[0030] 2. By blending silicate cement and aluminate cement in a specific ratio, the cementing capacity is improved. Combined with raw material pretreatment and mixing process, the bonding stability between the material and the base layer is ensured. This enables the material to bond tightly to concrete and other base layers and resists peeling and falling off under rainwater soaking and external force.

[0031] 3. By selecting all inorganic raw material components and combining them with nano-level modified components to construct a dense material structure, the erosion of the material interior by ultraviolet rays and rainwater is reduced. This enables the material to resist surface powdering and structural loosening under long-term exposure conditions, and delays the degradation of waterproof performance. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be described in further detail below.

[0033] Example 1:

[0034] This invention provides a method for preparing an inorganic mixture-based waterproofing material for exposed roofs, comprising the following specific steps:

[0035] S1, Raw material composition: Weigh the raw materials; the raw materials include, by weight: 40 parts silicate cement, 10 parts aluminate cement, 2 parts nano silica (particle size 10nm), 6 parts metakaolin, 0.2 parts silane coupling agent (KH-550), 1 part basalt short fiber (length 3-5mm), 0.5 parts polyvinyl alcohol short fiber (length 1mm), 15 parts quartz sand (particle size 0.1mm), 0.3 parts polycarboxylate superplasticizer, 0.1 parts organosilicon defoamer, 1 part nano montmorillonite (particle size 50nm), 8 parts deionized water, and 0.5 parts nano calcium carbonate (particle size 30nm).

[0036] S2, Raw material pretreatment:

[0037] S21, Cementitious / Aggregate Pretreatment: Place silicate cement, aluminate cement, and quartz sand in a drying equipment for drying, and cool to room temperature after drying for later use; wherein, the drying time is set to 2 hours and the drying temperature is set to 105℃.

[0038] S22, Fiber pretreatment: Basalt short fibers and polyvinyl alcohol short fibers are placed in an ultraviolet sterilization chamber for sterilization, and are then removed for use after sterilization; the sterilization time is set to 30 minutes.

[0039] S23, Nanoparticle Dispersion Treatment: Mix nano-silica with 1 / 3 of the total water volume of deionized water, add 0.1 parts of polycarboxylate superplasticizer, and place in an ultrasonic disperser for ultrasonic dispersion to form a uniform nano-silica dispersion; wherein, the ultrasonic dispersion time is set to 20 min.

[0040] S24, Fiber Coupling Coating Treatment: Sterilized basalt short fibers and polyvinyl alcohol short fibers are added to a high-speed mixer, and a diluted silane coupling agent solution is sprayed on them. The mixture is stirred for 15 minutes to make the fiber surface uniformly coated with a coupling agent film. The silane coupling agent solution is composed of silane coupling agent and 1 part deionized water.

[0041] S3, Premixing: First, add the pretreated silicate cement, aluminate cement, and quartz sand to a low-speed mixer, then add metakaolin and nano-montmorillonite for the first stirring; then slowly pour in the prepared nano-silica dispersion for the second stirring to obtain a uniform premix; the first stirring time is set to 3 min, and the second stirring time is set to 4 min.

[0042] S4, Enhanced mixing: Add the treated basalt short fibers and polyvinyl alcohol short fibers to the premix and stir using a mixer to ensure uniform fiber distribution; wherein, the mixer speed is set to 1400 r / min and the stirring time is set to 7 min;

[0043] S5, Slurry preparation:

[0044] S51, add the remaining polycarboxylate superplasticizer and silicone defoamer to the reinforcing mixture, then slowly add 2 / 3 of the total water volume of deionized water and stir to obtain a waterproof slurry with an extension of 200mm; wherein, the rotation speed is set to 800r / min and the stirring time is set to 9min.

[0045] S52, add nano-calcium carbonate to the waterproof slurry, keep the speed constant, and continue stirring for 2 minutes to obtain an inorganic mixture of exposed roof waterproofing material.

[0046] Based on the application of the aforementioned inorganic mixture exposed roof waterproofing material in roof waterproofing construction, the construction process involves first grinding the exposed roof substrate to remove surface dust, oil stains, and loose layers, then cleaning it with a high-pressure water gun. After the substrate moisture content is ≤8%, a layer of interface treatment agent (prepared from epoxy resin and acetone at a mass ratio of 5:1) is applied, with the interface agent's drying time controlled within 1-2 hours. Next, the troweling method is used, applying the finished waterproofing material to the substrate in two layers. The first layer is 3mm thick, and after initial setting, a second layer is applied with a thickness of 5mm, with the total thickness controlled at 8mm. Finally, after construction, watering is used for curing. For the first 3 days, water is sprayed 3 times a day, and for the subsequent 4 days, water is sprayed once a day, with a total curing time of no less than 7 days. During the curing period, rainwater erosion and foot traffic should be avoided.

[0047] Comparative Example 1:

[0048] This invention provides a method for preparing an inorganic mixture-based waterproofing material for exposed roofs, comprising the following specific steps:

[0049] S1, Raw material composition: Weigh the raw materials; the raw materials include, by weight: 40 parts silicate cement, 10 parts aluminate cement, 2 parts nano silica (particle size 10nm), 0.2 parts silane coupling agent (KH-550), 0.5 parts polyvinyl alcohol short fiber (length 1mm), 15 parts quartz sand (particle size 0.1mm), 0.3 parts polycarboxylate superplasticizer, 0.1 parts organosilicon defoamer, 1 part nano montmorillonite (particle size 50nm), 8 parts deionized water, and 0.5 parts nano calcium carbonate (particle size 30nm).

[0050] S2, Raw material pretreatment:

[0051] S21, Cementitious / Aggregate Pretreatment: Place silicate cement, aluminate cement, and quartz sand in a drying equipment for drying, and cool to room temperature after drying for later use; wherein, the drying time is set to 2 hours and the drying temperature is set to 105℃.

[0052] S22, Fiber pretreatment: Polyvinyl alcohol short fibers are placed in an ultraviolet sterilization chamber for sterilization, and are then removed for later use; the sterilization time is set to 30 minutes.

[0053] S23, Nanoparticle Dispersion Treatment: Mix nano-silica with 1 / 3 of the total water volume of deionized water, add 0.1 parts of polycarboxylate superplasticizer, and place in an ultrasonic disperser for ultrasonic dispersion to form a uniform nano-silica dispersion; wherein, the ultrasonic dispersion time is set to 20 min.

[0054] S24, Fiber Coupling Coating Treatment: Sterilized polyvinyl alcohol short fibers are added to a high-speed mixer and sprayed with a diluted silane coupling agent solution. The mixture is stirred for 15 minutes to uniformly coat the fiber surface with a coupling agent film. The silane coupling agent solution consists of 1 part silane coupling agent and 1 part deionized water.

[0055] S3, Premixing: First, add the pretreated silicate cement, aluminate cement, and quartz sand to a low-speed mixer, then add nano-montmorillonite for the first stirring; then slowly pour in the prepared nano-silica dispersion for the second stirring to obtain a uniform premix; the first stirring time is set to 3 min, and the second stirring time is set to 4 min.

[0056] S4, Enhanced Mixing: Add the treated polyvinyl alcohol short fibers to the premix and stir using a mixer to ensure uniform fiber distribution; wherein, the mixer speed is set to 1400 r / min and the stirring time is set to 7 min;

[0057] S5, Slurry preparation:

[0058] S51, add the remaining polycarboxylate superplasticizer and silicone defoamer to the reinforcing mixture, then slowly add 2 / 3 of the total water volume of deionized water and stir to obtain a waterproof slurry with an extension of 200mm; wherein, the rotation speed is set to 800r / min and the stirring time is set to 9min.

[0059] S52, add nano-calcium carbonate to the waterproof slurry, keep the speed constant, and continue stirring for 2 minutes to obtain an inorganic mixture of exposed roof waterproofing material.

[0060] Based on the application of the aforementioned inorganic mixture exposed roof waterproofing material in roof waterproofing construction, the construction process involves first grinding the exposed roof substrate to remove surface dust, oil stains, and loose layers, then cleaning it with a high-pressure water gun. After the substrate moisture content is ≤8%, a layer of interface treatment agent (prepared from epoxy resin and acetone at a mass ratio of 5:1) is applied, with the interface agent's drying time controlled within 1-2 hours. Next, the troweling method is used, applying the finished waterproofing material to the substrate in two layers. The first layer is 3mm thick, and after initial setting, a second layer is applied with a thickness of 5mm, with the total thickness controlled at 8mm. Finally, after construction, watering is used for curing. For the first 3 days, water is sprayed 3 times a day, and for the subsequent 4 days, water is sprayed once a day, with a total curing time of no less than 7 days. During the curing period, rainwater erosion and foot traffic should be avoided.

[0061] Example 2:

[0062] This invention provides a method for preparing an inorganic mixture-based waterproofing material for exposed roofs, comprising the following specific steps:

[0063] S1, Raw material composition: The raw materials are weighed; the raw materials include, by weight, 45 parts silicate cement, 12.5 parts aluminate cement, 3 parts nano silica (particle size 15nm), 8 parts metakaolin, 0.3 parts silane coupling agent (KH-550), 2 parts basalt short fiber (length 4mm), 1.0 part polyvinyl alcohol short fiber (length 1.5mm), 20 parts quartz sand (particle size 0.2mm), 0.45 parts polycarboxylate superplasticizer, 0.2 parts organosilicon defoamer, 1.5 parts nano montmorillonite (particle size 65nm), 10 parts deionized water, and 0.75 parts nano calcium carbonate (particle size 40nm).

[0064] S2, Raw material pretreatment:

[0065] S21, Cementitious / Aggregate Pretreatment: Silicate cement, aluminate cement, and quartz sand are placed in a drying equipment for drying, and then cooled to room temperature for later use; the drying time is set to 2.5 hours, and the drying temperature is set to 107.5℃.

[0066] S22, Fiber pretreatment: Basalt short fibers and polyvinyl alcohol short fibers are placed in an ultraviolet sterilization chamber for sterilization, and are then removed for later use; the sterilization time is set to 35 minutes.

[0067] S23, Nanoparticle Dispersion Treatment: Mix nano-silica with 1 / 3 of the total water volume of deionized water, add 0.15 parts of polycarboxylate superplasticizer, and place in an ultrasonic disperser for ultrasonic dispersion to form a uniform nano-silica dispersion; wherein, the ultrasonic dispersion time is set to 25 min.

[0068] S24, Fiber Coupling Coating Treatment: Sterilized basalt short fibers and polyvinyl alcohol short fibers are added to a high-speed mixer, and a diluted silane coupling agent solution is sprayed on them. The mixture is stirred for 17.5 minutes to make the fiber surface uniformly coated with a coupling agent film. The silane coupling agent solution is composed of silane coupling agent and 1.5 parts of deionized water.

[0069] S3, Premixing: First, add the pretreated silicate cement, aluminate cement, and quartz sand to a low-speed mixer, then add metakaolin and nano-montmorillonite for the first stirring; then slowly pour in the prepared nano-silica dispersion for the second stirring to obtain a uniform premix; the first stirring time is set to 3.5 min, and the second stirring time is set to 5 min.

[0070] S4, Enhanced Mixing: Add the treated basalt short fibers and polyvinyl alcohol short fibers to the premix and stir using a mixer to ensure uniform fiber distribution; wherein, the mixer speed is set to 1500 r / min and the stirring time is set to 8 min;

[0071] S5, Slurry preparation:

[0072] S51, add the remaining polycarboxylate superplasticizer and silicone defoamer to the reinforcing mixture, then slowly add 2 / 3 of the total water volume of deionized water and stir to obtain a waterproof slurry with an extension of 210 mm; wherein, the rotation speed is set to 900 r / min and the stirring time is set to 10 min.

[0073] S52, add nano-calcium carbonate to the waterproof slurry, keep the speed constant, and continue stirring for 2 minutes to obtain an inorganic mixture of exposed roof waterproofing material.

[0074] According to the above-mentioned application of an inorganic mixture exposed roof waterproofing material in roof waterproofing construction, the construction process involves first grinding the exposed roof substrate to remove surface dust, oil stains, and loose layers, then cleaning it with a high-pressure water gun. After the substrate moisture content is ≤8%, a layer of interface treatment agent (prepared by mixing epoxy resin and acetone in a mass ratio of 5:1) is applied, and the drying time of the interface agent is controlled within 1.5 hours. Next, the finished waterproofing material is applied to the substrate in two layers using the troweling method. The first layer is 4mm thick, and after the material has initially set, a second layer is applied with a thickness of 6.5mm. The total thickness of the two layers is controlled within 10.5mm. Finally, after the construction is completed, watering is used for moisturizing and curing. Water is sprayed 3 times a day for the first 3 days, and 2 times a day for the following 4 days, with a total curing time of no less than 7 days. During the curing period, rainwater washing and personnel trampling should be avoided.

[0075] Comparative Example 2:

[0076] This invention provides a method for preparing an inorganic mixture-based waterproofing material for exposed roofs, comprising the following specific steps:

[0077] S1, Raw material composition: The raw materials are weighed; the raw materials include, by weight: 45 parts silicate cement, 12.5 parts aluminate cement, 3 parts nano silica (particle size 15nm), 0.3 parts silane coupling agent (KH-550), 1.0 part polyvinyl alcohol short fiber (length 1.5mm), 20 parts quartz sand (particle size 0.2mm), 0.45 parts polycarboxylate superplasticizer, 0.2 parts organosilicon defoamer, 1.5 parts nano montmorillonite (particle size 65nm), 10 parts deionized water, and 0.75 parts nano calcium carbonate (particle size 40nm).

[0078] S2, Raw material pretreatment:

[0079] S21, Cementitious / Aggregate Pretreatment: Silicate cement, aluminate cement, and quartz sand are placed in a drying equipment for drying, and then cooled to room temperature for later use; the drying time is set to 2.5 hours, and the drying temperature is set to 107.5℃.

[0080] S22, Fiber pretreatment: Polyvinyl alcohol short fibers are placed in an ultraviolet sterilization chamber for sterilization, and are then removed for use after sterilization; the sterilization time is set to 35 minutes.

[0081] S23, Nanoparticle Dispersion Treatment: Mix nano-silica with 1 / 3 of the total water volume of deionized water, add 0.15 parts of polycarboxylate superplasticizer, and place in an ultrasonic disperser for ultrasonic dispersion to form a uniform nano-silica dispersion; wherein, the ultrasonic dispersion time is set to 25 min.

[0082] S24, Fiber Coupling Coating Treatment: Sterilized polyvinyl alcohol short fibers are added to a high-speed mixer and sprayed with a diluted silane coupling agent solution. The mixture is stirred for 17.5 minutes to uniformly coat the fiber surface with a coupling agent film. The silane coupling agent solution consists of 1.5 parts of silane coupling agent and deionized water.

[0083] S3, Premixing: First, add the pretreated silicate cement, aluminate cement, and quartz sand to a low-speed mixer, then add nano-montmorillonite for the first stirring; then slowly pour in the prepared nano-silica dispersion for the second stirring to obtain a uniform premix; the first stirring time is set to 3.5 min, and the second stirring time is set to 5 min.

[0084] S4, Enhanced Mixing: Add the treated polyvinyl alcohol short fibers to the premix and stir using a mixer to ensure uniform fiber distribution; wherein, the mixer speed is set to 1500 r / min and the stirring time is set to 8 min;

[0085] S5, Slurry preparation:

[0086] S51, add the remaining polycarboxylate superplasticizer and silicone defoamer to the reinforcing mixture, then slowly add 2 / 3 of the total water volume of deionized water and stir to obtain a waterproof slurry with an extension of 210 mm; wherein, the rotation speed is set to 900 r / min and the stirring time is set to 10 min.

[0087] S52, add nano-calcium carbonate to the waterproof slurry, keep the speed constant, and continue stirring for 2 minutes to obtain an inorganic mixture of exposed roof waterproofing material.

[0088] According to the above-mentioned application of an inorganic mixture exposed roof waterproofing material in roof waterproofing construction, the construction process involves first grinding the exposed roof substrate to remove surface dust, oil stains, and loose layers, then cleaning it with a high-pressure water gun. After the substrate moisture content is ≤8%, a layer of interface treatment agent (prepared by mixing epoxy resin and acetone in a mass ratio of 5:1) is applied, and the drying time of the interface agent is controlled within 1.5 hours. Next, the finished waterproofing material is applied to the substrate in two layers using the troweling method. The first layer is 4mm thick, and after the material has initially set, a second layer is applied with a thickness of 6.5mm. The total thickness of the two layers is controlled within 10.5mm. Finally, after the construction is completed, watering is used for moisturizing and curing. Water is sprayed 3 times a day for the first 3 days, and 2 times a day for the following 4 days, with a total curing time of no less than 7 days. During the curing period, rainwater washing and personnel trampling should be avoided.

[0089] Example 3:

[0090] This invention provides a method for preparing an inorganic mixture-based waterproofing material for exposed roofs, comprising the following specific steps:

[0091] S1, Raw material composition: Weigh the raw materials; the raw materials include, by weight: 50 parts silicate cement, 15 parts aluminate cement, 4 parts nano silica (particle size 20nm), 10 parts metakaolin, 0.4 parts silane coupling agent (KH-550), 3 parts basalt short fiber (length 5mm), 1.5 parts polyvinyl alcohol short fiber (length 2mm), 25 parts quartz sand (particle size 0.3mm), 0.6 parts polycarboxylate superplasticizer, 0.3 parts organosilicon defoamer, 2 parts nano montmorillonite (particle size 80nm), 12 parts deionized water, and 1 part nano calcium carbonate (particle size 50nm).

[0092] S2, Raw material pretreatment:

[0093] S21, Cementitious / Aggregate Pretreatment: Place silicate cement, aluminate cement, and quartz sand in a drying equipment for drying, and cool to room temperature after drying for later use; wherein, the drying time is set to 3 hours and the drying temperature is set to 110℃.

[0094] S22, Fiber pretreatment: Basalt short fibers and polyvinyl alcohol short fibers are placed in an ultraviolet sterilization chamber for sterilization, and are then removed for later use; the sterilization time is set to 40 minutes.

[0095] S23, Nanoparticle Dispersion Treatment: Mix nano-silica with 1 / 3 of the total water volume of deionized water, add 0.2 parts of polycarboxylate superplasticizer, and place in an ultrasonic disperser for ultrasonic dispersion to form a uniform nano-silica dispersion; wherein, the ultrasonic dispersion time is set to 30 min.

[0096] S24, Fiber Coupling Coating Treatment: Sterilized basalt short fibers and polyvinyl alcohol short fibers are added to a high-speed mixer, and a diluted silane coupling agent solution is sprayed on them. The mixture is stirred for 20 minutes to uniformly coat the fiber surface with a coupling agent film. The silane coupling agent solution consists of two parts: silane coupling agent and deionized water.

[0097] S3, Premixing: First, add the pretreated silicate cement, aluminate cement, and quartz sand to a low-speed mixer, then add metakaolin and nano-montmorillonite for the first stirring; then slowly pour in the prepared nano-silica dispersion for the second stirring to obtain a uniform premix; the first stirring time is set to 4 min, and the second stirring time is set to 6 min.

[0098] S4, Enhanced Mixing: Add the treated basalt short fibers and polyvinyl alcohol short fibers to the premix and stir using a mixer to ensure uniform fiber distribution; wherein, the mixer speed is set to 1600 r / min and the stirring time is set to 9 min;

[0099] S5, Slurry preparation:

[0100] S51, add the remaining polycarboxylate superplasticizer and silicone defoamer to the reinforcing mixture, then slowly add 2 / 3 of the total water volume of deionized water and stir to obtain a waterproof slurry with an extension of 220mm; wherein, the rotation speed is set to 1000r / min and the stirring time is set to 11min.

[0101] S52, add nano-calcium carbonate to the waterproof slurry, keep the speed constant, and continue stirring for 2 minutes to obtain an inorganic mixture of exposed roof waterproofing material.

[0102] According to the above-mentioned application of an inorganic mixture exposed roof waterproofing material in roof waterproofing construction, the exposed roof base layer is first ground to remove surface dust, oil stains and loose layers, and then cleaned with a high-pressure water gun. After the base layer moisture content is ≤8%, a layer of interface treatment agent (prepared by epoxy resin and acetone in a mass ratio of 5:1) is applied, and the drying time of the interface agent is controlled within 2 hours. Then, the troweling method is used to apply the finished waterproofing material to the base layer in two layers. The first troweling thickness is 5mm, and after the material has initially set, the second troweling thickness is 8mm. The total thickness of the two trowelings is controlled within 13mm. Finally, after the construction is completed, watering is used for moisturizing and curing. Water is sprayed 4 times a day for the first 3 days, and 2 times a day for the following 4 days. The total curing time is not less than 7 days. During the curing period, rainwater washing and personnel trampling are avoided.

[0103] Comparative Example 3:

[0104] This invention provides a method for preparing an inorganic mixture-based waterproofing material for exposed roofs, comprising the following specific steps:

[0105] S1, Raw material composition: Weigh the raw materials; the raw materials include, by weight: 50 parts silicate cement, 15 parts aluminate cement, 4 parts nano silica (particle size 20nm), 0.4 parts silane coupling agent (KH-550), 1.5 parts polyvinyl alcohol short fiber (length 2mm), 25 parts quartz sand (particle size 0.3mm), 0.6 parts polycarboxylate superplasticizer, 0.3 parts organosilicon defoamer, 2 parts nano montmorillonite (particle size 80nm), 12 parts deionized water, and 1 part nano calcium carbonate (particle size 50nm).

[0106] S2, Raw material pretreatment:

[0107] S21, Cementitious / Aggregate Pretreatment: Place silicate cement, aluminate cement, and quartz sand in a drying equipment for drying, and cool to room temperature after drying for later use; wherein, the drying time is set to 3 hours and the drying temperature is set to 110℃.

[0108] S22, Fiber pretreatment: Polyvinyl alcohol short fibers are placed in an ultraviolet sterilization chamber for sterilization, and are then removed for later use; the sterilization time is set to 40 minutes.

[0109] S23, Nanoparticle Dispersion Treatment: Mix nano-silica with 1 / 3 of the total water volume of deionized water, add 0.2 parts of polycarboxylate superplasticizer, and place in an ultrasonic disperser for ultrasonic dispersion to form a uniform nano-silica dispersion; wherein, the ultrasonic dispersion time is set to 30 min.

[0110] S24, Fiber Coupling Coating Treatment: Sterilized polyvinyl alcohol short fibers are added to a high-speed mixer and sprayed with a diluted silane coupling agent solution. The mixture is stirred for 20 minutes to uniformly coat the fiber surface with a coupling agent film. The silane coupling agent solution consists of two parts: silane coupling agent and deionized water.

[0111] S3, Premixing: First, add the pretreated silicate cement, aluminate cement, and quartz sand to a low-speed mixer, then add nano-montmorillonite for the first stirring; then slowly pour in the prepared nano-silica dispersion for the second stirring to obtain a uniform premix; the first stirring time is set to 4 min, and the second stirring time is set to 6 min.

[0112] S4, Enhanced Mixing: Add the treated polyvinyl alcohol short fibers to the premix and stir using a mixer to ensure uniform fiber distribution; wherein, the mixer speed is set to 1600 r / min and the stirring time is set to 9 min;

[0113] S5, Slurry preparation:

[0114] S51, add the remaining polycarboxylate superplasticizer and silicone defoamer to the reinforcing mixture, then slowly add 2 / 3 of the total water volume of deionized water and stir to obtain a waterproof slurry with an extension of 220mm; wherein, the rotation speed is set to 1000r / min and the stirring time is set to 11min.

[0115] S52, add nano-calcium carbonate to the waterproof slurry, keep the speed constant, and continue stirring for 2 minutes to obtain an inorganic mixture of exposed roof waterproofing material.

[0116] According to the above-mentioned application of an inorganic mixture exposed roof waterproofing material in roof waterproofing construction, the exposed roof base layer is first ground to remove surface dust, oil stains and loose layers, and then cleaned with a high-pressure water gun. After the base layer moisture content is ≤8%, a layer of interface treatment agent (prepared by epoxy resin and acetone in a mass ratio of 5:1) is applied, and the drying time of the interface agent is controlled within 2 hours. Then, the troweling method is used to apply the finished waterproofing material to the base layer in two layers. The first troweling thickness is 5mm, and after the material has initially set, the second troweling thickness is 8mm. The total thickness of the two trowelings is controlled within 13mm. Finally, after the construction is completed, watering is used for moisturizing and curing. Water is sprayed 4 times a day for the first 3 days, and 2 times a day for the following 4 days. The total curing time is not less than 7 days. During the curing period, rainwater washing and personnel trampling are avoided.

[0117] The inorganic mixture waterproofing materials for exposed roofs prepared in Examples 1-3 were compared, and the following data were obtained:

[0118]

[0119] As can be seen from the table above, the inorganic mixture exposed roof waterproofing materials prepared in Examples 1-3 all have good performance in terms of crack resistance and adhesion. After use, Example 2 has the best effect.

[0120] Although the present invention has been described above with reference to embodiments, various modifications can be made and components can be replaced with equivalents without departing from the scope of the invention. In particular, as long as there is no structural conflict, the features in the disclosed embodiments can be combined with each other in any manner. The lack of an exhaustive description of these combinations in this specification is merely for the sake of brevity and resource conservation. Therefore, the present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A method for preparing an inorganic mixture-based waterproofing material for exposed roofs, characterized in that, The specific steps are as follows: S1, Raw material composition: Weigh the raw materials; S2, Raw material pretreatment: S21, Cementitious / Aggregate Pretreatment: Place silicate cement, aluminate cement, and quartz sand in a drying equipment for drying, and cool to room temperature after drying for later use. S22, Fiber pretreatment: Basalt short fibers and polyvinyl alcohol short fibers are placed in an ultraviolet sterilization chamber for sterilization, and are taken out for use after sterilization. S23, Nanoparticle Dispersion Treatment: Mix nano-silica with 1 / 3 of the total water volume of deionized water, add 0.1-0.2 parts of polycarboxylate superplasticizer, and place in an ultrasonic disperser for ultrasonic dispersion to form a uniform nano-silica dispersion. S24, Fiber Coupling Coating Treatment: Sterilized basalt short fibers and polyvinyl alcohol short fibers are added to a high-speed mixer, and a diluted silane coupling agent solution is sprayed on. The mixture is stirred for 15-20 minutes to make the fiber surface uniformly coated with a coupling agent film. S3, Premixing: First, add the pretreated silicate cement, aluminate cement, and quartz sand to a low-speed mixer, then add metakaolin and nano-montmorillonite for the first stirring; then slowly pour in the prepared nano-silica dispersion for the second stirring to obtain a uniform premix. S4, Enhanced Mixing: Add the treated basalt short fibers and polyvinyl alcohol short fibers to the premix and stir using a mixer to make the fibers evenly distributed; S5, Slurry preparation: S51, add the remaining polycarboxylate superplasticizer and silicone defoamer to the reinforcing mixture, then slowly add 2 / 3 of the total water volume of deionized water and stir to obtain a waterproof slurry with an extension of 200-220mm; S52, add nano-calcium carbonate to the waterproof slurry, keep the speed constant, and continue stirring for 2 minutes to obtain an inorganic mixture of exposed roof waterproofing material.

2. The method for preparing an inorganic mixture exposed roof waterproofing material according to claim 1, characterized in that, The raw materials in S1, by weight, include: 40-50 parts silicate cement, 10-15 parts aluminate cement, 2-4 parts nano silica, 6-10 parts metakaolin, 0.2-0.4 parts silane coupling agent, 1-3 parts basalt short fiber, 0.5-1.5 parts polyvinyl alcohol short fiber, 15-25 parts quartz sand, 0.3-0.6 parts polycarboxylate superplasticizer, 0.1-0.3 parts organosilicon defoamer, 1-2 parts nano montmorillonite, 8-12 parts deionized water, and 0.5-1 parts nano calcium carbonate.

3. The method for preparing an inorganic mixture exposed roof waterproofing material according to claim 1, characterized in that, In step S21, the drying time is set to 2-3 hours and the drying temperature is set to 105-110℃; in step S22, the sterilization time is set to 30-40 minutes.

4. The method for preparing an inorganic mixture exposed roof waterproofing material according to claim 1, characterized in that, The ultrasonic dispersion time in S23 is set to 20-30 min; the silane coupling agent solution in S24 is composed of silane coupling agent and 1-2 parts of deionized water.

5. The method for preparing an inorganic mixture exposed roof waterproofing material according to claim 1, characterized in that, In step S3, the first stirring time is set to 3-4 minutes, and the second stirring time is set to 4-6 minutes.

6. The method for preparing an inorganic mixture exposed roof waterproofing material according to claim 1, characterized in that, In S4, the mixer speed is set to 1400-1600 r / min, and the stirring time is set to 7-9 min.

7. The method for preparing an inorganic mixture exposed roof waterproofing material according to claim 1, characterized in that, In S51, the rotation speed is set to 800-1000 r / min, and the stirring time is set to 9-11 min.

8. The application of an inorganic mixture exposed roof waterproofing material according to any one of claims 1-7 in roof waterproofing construction, characterized in that, During construction, the exposed roof surface base layer is first ground to remove surface dust, oil stains, and loose layers. Then, it is cleaned with a high-pressure water gun. After the base layer moisture content is ≤8%, a layer of interface treatment agent is applied, and the interface agent's drying time is controlled within 1-2 hours. Next, the finished waterproof material is applied to the base layer in two layers using the troweling method. The first troweling thickness is 3-5mm, and after the material has initially set, the second troweling thickness is 5-8mm. The total thickness of the two trowelings is controlled within 8-13mm. Finally, after the construction is completed, watering is used for moisturizing and curing. For the first 3 days, water is sprayed 3-4 times a day, and for the following 4 days, water is sprayed 1-2 times a day. The total curing time is no less than 7 days. During the curing period, rainwater washing and personnel trampling are avoided.

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