Preparation method and application of inorganic mixture exposed roof waterproof material

Abstract

The invention discloses a preparation method and application of an inorganic mixture exposed roof waterproof material, and belongs to the technical field of building materials. According to the preparation method of the roof waterproof material, the roof waterproof material is obtained by stirring and mixing a component A and a component B, wherein the component A is prepared from the following components in parts by weight: 50 to 55 parts of water, 30 to 35 parts of vinyl acetate-ethylene copolymer emulsion, 5 to 6 parts of polyvinyl alcohol, 2 to 3 parts of magnesium chloride aqueous solution, 2 to 3 parts of polycarboxylic acid water reducer, 0.8 to 1 part of ultraviolet light absorber, 0.5 to 0.6 part of defoaming agent and 2 to 2.5 parts of silane coupling agent; wherein the component B is ordinary Portland cement; when the prepared roof waterproof material is combined with polypropylene fiber cloth and glass fiber gridding cloth for use, the roof waterproof material has super-strong interface bonding force and excellent waterproof performance, and can be widely applied to roof waterproofing.

Description

Technical Field

[0001] The invention belongs to the technical field of building materials, and particularly relates to a preparation method and application of an inorganic mixture exposed roof waterproof material. Background Art

[0002] As a crucial building envelope, roofs are directly exposed to a variety of natural factors, including rain, snow, sunlight, and wind. Proper roof waterproofing is crucial for ensuring a building's proper functionality and durability. Leaks in the roof can not only cause mold and peeling on ceilings and walls, impacting the building's aesthetics and indoor environmental quality, but can also threaten the building's structural safety, leading to steel corrosion and concrete carbonization, shortening the building's service life. Therefore, the development of high-performance roof waterproofing materials has long been a key focus in the building materials field.

[0003] Asphalt-based waterproofing materials are among the earliest and most widely used roofing waterproofing materials. Common examples include petroleum asphalt paper-based felt and SBS-modified asphalt waterproofing membranes. While petroleum asphalt paper-based felt is inexpensive, it suffers from low tensile strength, poor heat resistance, and aging, resulting in a short service life.

[0004] Therefore, the present invention develops a preparation method and application of an inorganic mixture exposed roof waterproof material, which is used to solve the technical problems of poor anti-aging and weather resistance of traditional cement mortar roof waterproof materials in the prior art. Summary of the Invention

[0005] The purpose of the present invention is to provide a preparation method and application of an inorganic mixture exposed roof waterproof material, which is used to solve the technical problems of poor anti-aging and weather resistance of traditional cement mortar roof waterproof materials in the prior art.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A method for preparing an inorganic mixture exposed roof waterproof material is obtained by stirring and mixing component A and component B in a weight ratio of 1:1, wherein component A consists of the following ingredients in parts by weight: 50-55 parts of water, 30-35 parts of vinyl acetate-ethylene copolymer emulsion, 5-6 parts of polyvinyl alcohol, 2-3 parts of magnesium chloride aqueous solution, 2-3 parts of polycarboxylic acid-based water reducer, 0.8-1 part of ultraviolet absorber, 0.5-0.6 part of defoamer and 2-2.5 parts of silane coupling agent; and component B is ordinary Portland cement.

[0008] The concentration of the magnesium chloride aqueous solution is 20-30 wt %; the modified calcined kaolin is obtained by hydrolyzing the calcined kaolin with alkaline protease and modifying it with nano-SiO2.

[0009] The preparation method of the component A comprises the following steps:

[0010] (1) adding polyvinyl alcohol to water, heating while stirring, keeping the temperature and stirring continuously to obtain a polyvinyl alcohol aqueous solution; while stirring, adding vinyl acetate-ethylene copolymer emulsion to the polyvinyl alcohol aqueous solution, stirring, and then adding magnesium chloride aqueous solution, stirring evenly to obtain a premixed solution;

[0011] (2) Adding a polycarboxylic acid-based water reducer, an ultraviolet absorber, a defoaming agent, and a silane coupling agent to the premixed solution in sequence and mixing them uniformly to obtain component A.

[0012] Preferably, in step (1), the stirring speed is 100-150 r / min, the heating temperature is 80-90° C., and the stirring time is 30-60 min.

[0013] The preparation method of the modified calcined kaolin comprises the following steps:

[0014] S1. Mixing calcined kaolin with alkaline protease solution, performing enzymatic hydrolysis by oscillation, inactivating the mixture after completion, centrifuging, collecting the precipitate, washing, drying, grinding, and sieving to obtain enzyme-activated kaolin;

[0015] S2. Add nano-SiO2 to an ethanol-water mixture, perform ultrasonic treatment to obtain a nano-SiO2 suspension, mix the enzyme-activated kaolin with the nano-SiO2 suspension, stir to react, filter, dry, and perform heat treatment to obtain modified calcined kaolin.

[0016] Preferably, the concentration of the alkaline protease solution in S1 is 0.5-0.6wt%, the pH value of the alkaline protease solution is adjusted to 9-10 with 1M NaOH, the amount ratio of calcined kaolin to alkaline protease solution is 1g:4-5mL, the enzymatic hydrolysis temperature is 48-50°C, the oscillation speed is 120-150r / min, the oscillation time is 12-14h, the inactivation temperature is 90-92°C, the inactivation time is 18-20min, the centrifugal speed is 3000-4000r / min, the centrifugation time is 8-10min, the product is washed with deionized water 3-5 times, the vacuum drying temperature is 55-60°C, the product is vacuum dried to a moisture content of ≤1%, and the product is sieved through a 180-200 mesh sieve.

[0017] Preferably, the amount ratio of nano-SiO2 to ethanol-water mixture in the S2 is 3-5g:100mL, the ethanol-water mixture is obtained by mixing ethanol and water in a volume ratio of 1:4, the frequency of ultrasonic treatment is 40kHz, the power of ultrasonic treatment is 500W, the time of ultrasonic treatment is 25-30min, the amount ratio of enzyme-activated kaolin to nano-SiO2 suspension is 1g:2.8-3mL, the stirring reaction time is 2-3h, the stirring reaction speed is 280-300r / min, the stirring reaction temperature is 58-60℃, the drying temperature is 78-80℃, the heat treatment temperature is 300-320℃, and the heat treatment time is 1-2h.

[0018] The present invention also provides the use of an inorganic mixture exposed roofing waterproof material in roofing waterproofing construction, wherein during construction, the roofing waterproof material is first applied to the bottom surface of the base layer and the surface of the polypropylene cloth, and then a first layer of glass fiber mesh cloth is immediately laid, and pressed with a scraper or a brush to fully soak the mesh cloth in the roofing waterproof material to ensure that the mesh cloth and the roofing waterproof material are tightly combined; after preliminary curing, a second layer of roofing waterproof material is applied, and a second layer of glass fiber mesh cloth is immediately laid; after preliminary curing, a third layer of roofing waterproof material is applied to completely cover the glass fiber mesh cloth, and curing is performed to obtain a roofing protective layer.

[0019] Preferably, the coating thickness of the roof waterproofing material is 1-2 mm, the initial curing time is 1-2 hours, and the curing time is 2-3 days.

[0020] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0021] 1. The present invention forms a flexible continuous film by the VAE emulsion in component A and polyvinyl alcohol, which can form a continuous and complete waterproof membrane on the roof base, effectively blocking the intrusion of water; the chloride ions in the magnesium chloride can react with the free calcium oxide in the cement to generate calcium chloride, increasing the content of free chloride ions; the magnesium chloride aqueous solution adjusts the curing speed and water resistance of the material; the polycarboxylic acid-based water reducer improves the fluidity and dispersibility of the material, facilitating construction operations.

[0022] 2. The present invention changes the surface properties and pore structure of calcined kaolin through the alkaline protease enzymatic hydrolysis process. The enzymatic hydrolysis breaks the impurities and some chemical bonds on the surface of the kaolin, increases the surface active sites, and improves the binding ability with other materials; the nano-SiO2 modification further fills the pores of the kaolin, making the microstructure of the kaolin denser, reducing the penetration channels of moisture and harmful substances, and improving the material's impermeability and durability; therefore, the modified calcined kaolin improves resistance to erosion by chemical substances, thereby extending the material's service life in harsh environments. DETAILED DESCRIPTION

[0023] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0024] Example 1:

[0025] This embodiment discloses a method for preparing the modified calcined kaolin, comprising the following steps:

[0026] S1. 100 g of calcined kaolin was mixed with 400 mL of a 0.5 wt % alkaline protease solution, and the pH of the alkaline protease solution was adjusted to 9 with 1 M NaOH. The solution was subjected to oscillation enzymolysis at a temperature of 48 ° C., an oscillation speed of 120 r / min, and an oscillation time of 12 h. The solution was inactivated at a temperature of 90 ° C. and an inactivation time of 18 min. The solution was centrifuged at a speed of 3000 r / min and a centrifugation time of 8 min. The precipitate was washed three times with deionized water, dried, and vacuum-dried at a temperature of 55 ° C. The solution was vacuum-dried to a moisture content of ≤1%, ground, and passed through a 180-mesh sieve to obtain enzyme-activated kaolin.

[0027] S2. Add 9g of nano-SiO2 to 300mL of ethanol-water mixture, where the ethanol-water mixture is obtained by mixing ethanol and water in a volume ratio of 1:4, and perform ultrasonic treatment at a frequency of 40kHz, a power of 500W, and a time of 25min to obtain a nano-SiO2 suspension. Mix 100g of enzyme-activated kaolin with 280mL of nano-SiO2 suspension, stir and react, the stirring reaction time is 2h, the stirring reaction speed is 280r / min, the stirring reaction temperature is 58°C, filter, dry, the drying temperature is 78°C, and heat treat, the heat treatment temperature is 300°C, and the heat treatment time is 1h to obtain modified calcined kaolin.

[0028] This embodiment discloses a method for preparing an inorganic mixture exposed roof waterproof material. The inorganic mixture is prepared by stirring and mixing component A and component B in a weight ratio of 1:1, wherein component A comprises the following ingredients by weight: 5 kg of water, 3 kg of vinyl acetate-ethylene copolymer emulsion, 500 g of polyvinyl alcohol, 200 g of a 20 wt% magnesium chloride aqueous solution, 200 g of a polycarboxylic acid-based water reducer, 80 g of a UV absorber 2-(2'-hydroxy-5'-methylphenyl)benzotriazole, 50 g of a defoamer BYK-022, and 200 g of a KH-550 silane coupling agent; and component B comprises the following ingredients by weight: 157 kg of ordinary Portland cement.

[0029] The preparation method of component A comprises the following steps:

[0030] (1) adding polyvinyl alcohol to water, heating the mixture while stirring at a speed of 100 r / min and a temperature of 80° C., maintaining the temperature and stirring continuously for 30 minutes to obtain a polyvinyl alcohol aqueous solution; while stirring, adding vinyl acetate-ethylene copolymer emulsion to the polyvinyl alcohol aqueous solution, stirring, and then adding magnesium chloride aqueous solution, stirring uniformly to obtain a premixed solution;

[0031] (2) Adding a polycarboxylic acid-based water reducer, an ultraviolet absorber, a defoaming agent, and a silane coupling agent to the premixed solution in sequence and mixing them uniformly to obtain component A.

[0032] The invention discloses an application of an inorganic mixture exposed roofing waterproof material in roofing waterproof construction. During construction, the roofing waterproof material is firstly applied on the bottom surface of a base layer and the surface of a polypropylene cloth, the application thickness of the roofing waterproof material being 1 mm, and then a first layer of glass fiber mesh cloth is immediately laid, and the mesh cloth is pressed with a scraper or a brush to fully soak the mesh cloth in the roofing waterproof material, ensuring that the mesh cloth and the roofing waterproof material are tightly combined; after preliminary curing for 1 hour, a second layer of roofing waterproof material is applied, and the second layer of glass fiber mesh cloth is immediately laid, and after preliminary curing for 1 hour, a third layer of roofing waterproof material is applied to completely cover the glass fiber mesh cloth, and curing is carried out for 2 days to obtain a roofing protective layer.

[0033] Example 2:

[0034] This embodiment discloses a method for preparing the modified calcined kaolin, comprising the following steps:

[0035] S1. 100 g of calcined kaolin was mixed with 450 mL of a 0.55 wt % alkaline protease solution, and the pH of the alkaline protease solution was adjusted to 9.5 with 1 M NaOH. The solution was subjected to oscillation enzymolysis at a temperature of 49 ° C., an oscillation speed of 140 r / min, and an oscillation time of 13 h. The solution was inactivated at a temperature of 91 ° C. and an inactivation time of 19 min. The solution was centrifuged at a speed of 3500 r / min and a centrifugation time of 9 min. The precipitate was washed four times with deionized water, dried, and vacuum-dried at a temperature of 58 ° C. The solution was vacuum-dried to a moisture content of ≤1%, ground, and passed through a 190 mesh sieve to obtain enzyme-activated kaolin.

[0036] S2. Add 12g of nano-SiO2 to 300mL of ethanol-water mixture, where the ethanol-water mixture is obtained by mixing ethanol and water in a volume ratio of 1:4, and perform ultrasonic treatment at a frequency of 40kHz, a power of 500W, and a time of 28min to obtain a nano-SiO2 suspension. Mix 100g of enzyme-activated kaolin with 290mL of nano-SiO2 suspension, stir and react, the stirring reaction time is 3h, the stirring reaction speed is 290r / min, the stirring reaction temperature is 59°C, filter, dry, the drying temperature is 79°C, heat treat, the heat treatment temperature is 310°C, and the heat treatment time is 1.5h to obtain modified calcined kaolin.

[0037] This embodiment discloses a method for preparing an inorganic mixture exposed roof waterproof material. The inorganic mixture is prepared by stirring and mixing component A and component B in a weight ratio of 1:1, wherein component A comprises the following ingredients by weight: 5.3 kg of water, 3.3 kg of vinyl acetate-ethylene copolymer emulsion, 550 g of polyvinyl alcohol, 250 g of a 25 wt% magnesium chloride aqueous solution, 250 g of a polycarboxylic acid-based water reducer, 90 g of a UV absorber 2-(2'-hydroxy-5'-methylphenyl)benzotriazole, 55 g of a defoamer BYK-022, and 230 g of a KH-550 silane coupling agent; and component B comprises the following ingredients by weight: 177.8 kg of ordinary Portland cement.

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

[0039] (1) adding polyvinyl alcohol to water, heating the mixture while stirring at a speed of 120 r / min and a temperature of 85° C., maintaining the temperature and stirring continuously for 50 minutes to obtain a polyvinyl alcohol aqueous solution; while stirring, adding vinyl acetate-ethylene copolymer emulsion to the polyvinyl alcohol aqueous solution, stirring, and then adding magnesium chloride aqueous solution, stirring uniformly to obtain a premixed solution;

[0040] (2) Adding a polycarboxylic acid-based water reducer, an ultraviolet absorber, a defoaming agent, and a silane coupling agent to the premixed solution in sequence and mixing them uniformly to obtain component A.

[0041] The invention discloses an application of an inorganic mixture exposed roofing waterproof material in roofing waterproof construction. During construction, the roofing waterproof material is firstly applied on the bottom surface of a base layer and the surface of a polypropylene cloth, the application thickness of the roofing waterproof material being 1.5 mm, and then a first layer of glass fiber mesh cloth is immediately laid, and the mesh cloth is pressed with a scraper or a brush to fully soak the mesh cloth in the roofing waterproof material, ensuring that the mesh cloth and the roofing waterproof material are tightly combined; after preliminary curing for 1.5 hours, a second layer of roofing waterproof material is applied, and the second layer of glass fiber mesh cloth is immediately laid, and after preliminary curing for 1.5 hours, a third layer of roofing waterproof material is applied to completely cover the glass fiber mesh cloth, and curing is carried out for 2 days to obtain a roofing protective layer.

[0042] Example 3:

[0043] This embodiment discloses a method for preparing the modified calcined kaolin, comprising the following steps:

[0044] S1. 100 g of calcined kaolin was mixed with 500 mL of a 0.6 wt % alkaline protease solution, and the pH of the alkaline protease solution was adjusted to 10 with 1 M NaOH. The solution was subjected to oscillation enzymolysis at a temperature of 50° C., an oscillation speed of 150 r / min, and an oscillation time of 14 h. The solution was inactivated at a temperature of 92° C. and an inactivation time of 20 min. The solution was centrifuged at a speed of 4000 r / min and a centrifugation time of 10 min. The precipitate was washed five times with deionized water, dried, and vacuum-dried at a temperature of 60° C. to a moisture content of ≤1%. The precipitate was ground and passed through a 200 mesh sieve to obtain enzyme-activated kaolin.

[0045] S2. Add 15g of nano-SiO2 to 300mL of ethanol-water mixture, where the ethanol-water mixture is obtained by mixing ethanol and water in a volume ratio of 1:4, and perform ultrasonic treatment at a frequency of 40kHz, a power of 500W, and a time of 30min to obtain a nano-SiO2 suspension. Mix 100g of enzyme-activated kaolin with 300mL of the nano-SiO2 suspension, stir and react, the stirring reaction time is 3h, the stirring reaction speed is 300r / min, the stirring reaction temperature is 60°C, filter, dry, the drying temperature is 80°C, and heat treat, the heat treatment temperature is 320°C, and the heat treatment time is 2h to obtain modified calcined kaolin.

[0046] This embodiment discloses a method for preparing an inorganic mixture exposed roof waterproof material. The inorganic mixture is prepared by stirring and mixing component A and component B in a weight ratio of 1:1, wherein component A comprises the following ingredients by weight: 5.5 kg of water, 3.5 kg of vinyl acetate-ethylene copolymer emulsion, 600 g of polyvinyl alcohol, 300 g of a 30 wt% magnesium chloride aqueous solution, 300 g of a polycarboxylic acid-based water reducer, 100 g of a UV absorber 2-(2'-hydroxy-5'-methylphenyl)benzotriazole, 60 g of a defoamer BYK-022, and 200-250 g of a KH-550 silane coupling agent; and component B comprises the following ingredients by weight: 198.5 kg of ordinary Portland cement.

[0047] The preparation method of component A comprises the following steps:

[0048] (1) adding polyvinyl alcohol to water, heating the mixture while stirring at a speed of 150 r / min and a temperature of 90° C., maintaining the temperature and stirring continuously for 60 minutes to obtain a polyvinyl alcohol aqueous solution; while stirring, adding vinyl acetate-ethylene copolymer emulsion to the polyvinyl alcohol aqueous solution, stirring, and then adding magnesium chloride aqueous solution, stirring uniformly to obtain a premixed solution;

[0049] (2) Adding a polycarboxylic acid-based water reducer, an ultraviolet absorber, a defoaming agent, and a silane coupling agent to the premixed solution in sequence and mixing them uniformly to obtain component A.

[0050] The invention discloses an application of an inorganic mixture exposed roofing waterproof material in roofing waterproof construction. During construction, the roofing waterproof material is firstly applied on the bottom surface of a base layer and the surface of a polypropylene cloth, the application thickness of the roofing waterproof material being 2 mm, and then a first layer of glass fiber mesh cloth is immediately laid, and the mesh cloth is pressed with a scraper or a brush to fully soak the mesh cloth in the roofing waterproof material, ensuring that the mesh cloth and the roofing waterproof material are tightly combined; after preliminary curing for 2 hours, a second layer of roofing waterproof material is applied, and the second layer of glass fiber mesh cloth is immediately laid, and after preliminary curing for 2 hours, a third layer of roofing waterproof material is applied to completely cover the glass fiber mesh cloth, and curing is carried out for 3 days to obtain a roofing protective layer.

[0051] Comparative Example 1:

[0052] Comparative Example 1 Compared with Example 3, in the preparation process of the roof waterproof material in Comparative Example 1, the calcined kaolin modification was not performed, and other conditions remained unchanged.

[0053] Comparative Example 2:

[0054] Comparative Example 2 Compared with Example 3, in the preparation process of the roof waterproof material in Comparative Example 2, no magnesium chloride aqueous solution was added, and other conditions remained unchanged.

[0055] Experimental example:

[0056] The roofing waterproof materials prepared in Examples 1-3 and Comparative Examples 1-2 were subjected to performance tests:

[0057] According to the step-by-step pressurization method for anti-seepage performance test of GB / T 23445-2009, the roofing waterproof materials of Examples 1-3 and Comparative Examples 1-2 were respectively prepared into test pieces that meet the standards. The diameter of the cylinder is 100 mm and the height is 150 mm, with 6 test pieces in each group. Curing requirements: The test pieces are placed in a standard curing room at 20°C and a relative humidity of 95% for 28 days. They are taken out and dried one day before the test. Sealing treatment: Apply sealing materials such as melted paraffin + rosin or cement + butter on the side of the test piece; press the test piece into a preheated test mold (30-40°C), and fix it in the test position of the anti-seepage instrument after cooling. Initial water pressure: Start pressurization from 0.2MPa, and the pressure increment for each subsequent stage is 0.2MPa. Each stage of pressure is maintained for 8 hours. Step-by-step pressurization: Start the water-resistance tester and apply an initial pressure of 0.2 MPa to the specimen. Increase the water pressure by 0.2 MPa every 8 hours (e.g., 0.4 MPa → 0.6 MPa → 0.8 MPa…) until the stopping condition is met. Water seepage observation: Record water seepage on the specimen end faces. If three of the six specimens show water seepage, stop the test immediately and record the current water pressure. Water-resistance grade P = 10H-1, where H is the water pressure (MPa) at which three specimens show water seepage. The results of water-resistance grade P are shown in Table 1.

[0058] Water absorption was tested in accordance with GB / T 1733-1993. The roofing waterproof materials of Examples 1-3 and Comparative Examples 1-2 were uniformly coated on a standard tinplate substrate to a dry film thickness of 1.5 mm. After curing, the materials were cut into 50 mm × 50 mm specimens. Two-thirds of the specimens were immersed in 25°C distilled water for 24 hours, then removed, the surface moisture was blotted dry, and the specimens were weighed. Water absorption (%) = (mass after immersion - initial mass) / initial mass × 100%. The calculated water absorption is shown in Table 1.

[0059] Bond strength tests were conducted according to GB / T 23445-2009 using a cement mortar substrate (70 mm × 70 mm × 20 mm). Mortar was prepared according to GB / T 17671-1999. After curing for 7 days, the surface was ground until the laitance was removed to ensure that the substrate was dry and contaminant-free. The roofing waterproofing materials of Examples 1-3 and Comparative Examples 1-2 were then applied to a total thickness of 1.5 mm, with each layer separated by 24 hours until fully dry. Curing conditions included curing for 96 hours under standard conditions (25°C, 50% humidity), followed by curing in a 40°C drying oven for 48 hours. Adhesive application: A high-strength epoxy adhesive (solvent-based epoxy resin) was evenly applied to the coating surface, covering an area of 40 mm × 40 mm, i.e., a bonding area of 1600 mm. 2Press the steel connector and let it stand for 24 hours to cure. Use a tensile testing machine to stretch vertically at a speed of 5mm / min until it breaks. Bond strength = maximum load value / bonding area, record the maximum load value, the bonding area is 1600mm 2 , the calculated bonding strength is shown in Table 1.

[0060] Table 1

[0061]

[0062]

[0063] The test results in Table 1 indicate that the roofing waterproof materials prepared in Examples 1-3 of the present invention exhibit excellent waterproofing properties and bond strength. A comparison of Comparative Examples 1-2 with Examples 1-3 indicates that the addition of modified calcined kaolin and magnesium chloride aqueous solution enhances the waterproofing properties and bond strength of the roofing waterproof materials.

[0064] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

[0065] The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the present invention to specific embodiments. Obviously, many modifications and variations are possible based on the contents of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A method for preparing an inorganic mixture exposed roof waterproof material, characterized in that: The modified calcined kaolin is prepared by stirring and mixing component A and component B in a weight ratio of 1:1, wherein component A comprises the following ingredients in parts by weight: 50-55 parts of water, 30-35 parts of vinyl acetate-ethylene copolymer emulsion, 5-6 parts of polyvinyl alcohol, 2-3 parts of magnesium chloride aqueous solution, 2-3 parts of polycarboxylic acid water reducer, 0.8-1 part of ultraviolet absorber, 0.5-0.6 part of defoamer and 2-2.5 parts of silane coupling agent; component B is ordinary Portland cement; the concentration of the magnesium chloride aqueous solution is 20-30wt%; and the modified calcined kaolin is obtained by hydrolyzing the calcined kaolin with alkaline protease and modifying it with nano-SiO2.

2. The method for preparing an inorganic mixture exposed roof waterproof material according to claim 1, characterized in that: The preparation method of the component A comprises the following steps: (1) adding polyvinyl alcohol to water, heating while stirring, keeping the temperature and stirring continuously to obtain a polyvinyl alcohol aqueous solution; while stirring, adding vinyl acetate-ethylene copolymer emulsion to the polyvinyl alcohol aqueous solution, stirring, and then adding magnesium chloride aqueous solution, stirring evenly to obtain a premixed solution; (2) Adding a polycarboxylic acid-based water reducer, an ultraviolet absorber, a defoaming agent, and a silane coupling agent to the premixed solution in sequence and mixing them uniformly to obtain component A.

3. The method for preparing an inorganic mixture exposed roof waterproof material according to claim 1, characterized in that: The preparation method of the modified calcined kaolin comprises the following steps: S1. Mixing calcined kaolin with alkaline protease solution, performing enzymatic hydrolysis by oscillation, inactivating the mixture after completion, centrifuging, collecting the precipitate, washing, drying, grinding, and sieving to obtain enzyme-activated kaolin; S2. Add nano-SiO2 to an ethanol-water mixture, perform ultrasonic treatment to obtain a nano-SiO2 suspension, mix the enzyme-activated kaolin with the nano-SiO2 suspension, stir to react, filter, dry, and perform heat treatment to obtain modified calcined kaolin.

4. The method for preparing an inorganic mixture exposed roof waterproof material according to claim 3, characterized in that: The concentration of the alkaline protease solution in S1 is 0.5-0.6 wt %, the pH value of the alkaline protease solution is adjusted to 9-10 with 1 M NaOH, and the usage ratio of calcined kaolin to alkaline protease solution is 1 g: 4-5 mL.

5. The method for preparing an inorganic mixture exposed roof waterproof material according to claim 3, characterized in that: The dosage ratio of nano-SiO2 to ethanol-water mixture in S2 is 3-5g:100mL, the ethanol-water mixture is obtained by mixing ethanol and water in a volume ratio of 1:4, and the dosage ratio of enzyme-activated kaolin to nano-SiO2 suspension is 1g:2.8-3mL.

6. Use of an inorganic mixture exposed roof waterproof material according to any one of claims 1 to 5 in roof waterproof construction, characterized in that: During construction, first apply the roofing waterproof material on the bottom surface of the base layer and the surface of the polypropylene cloth, then immediately lay the first layer of glass fiber mesh cloth, press it, and after preliminary curing, apply the second layer of roofing waterproof material, immediately lay the second layer of glass fiber mesh cloth, after preliminary curing, apply the third layer of roofing waterproof material, maintain it, and obtain the roof protection layer.

7. Use of an inorganic mixture exposed roof waterproof material according to claim 6 in roof waterproof construction, characterized in that: The coating thickness of the roof waterproofing material is 1-2mm, the initial curing time is 1-2h, and the curing time is 2-3 days.

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