Modified rubber powder and preparation method thereof, composition for coating material, coating material and preparation method thereof, and modified asphalt waterproof coiled material

Abstract

The invention relates to the technical field of waterproof coiled materials, and discloses modified rubber powder and a preparation method thereof, a composition for a coating material, the coating material and a preparation method thereof, and a modified asphalt waterproof coiled material. The method for preparing the modified rubber powder comprises the following steps: (1) in the presence of water, soaking sunflower seed meal to obtain an intermediate I; (2) stirring the intermediate I and cellulase to obtain an intermediate II; and (3) in the presence of ethanol, contacting and mixing raw material rubber powder with the intermediate II to obtain the modified rubber powder, relative to 100 parts by weight of the sunflower seed meal, the use amount of the cellulase is 0.1-0.5 part by weight, and the use amount of the raw material rubber powder is 100-400 parts by weight. The modified asphalt waterproof coiled material provided by the invention has excellent antibacterial performance and also has good adhesion and aging resistance.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of waterproofing membranes, in particular to a modified powder, a preparation method thereof, a composition for coating material, a coating material, a preparation method thereof, and a modified asphalt waterproofing membrane. BACKGROUND

[0002] Modified asphalt waterproofing membranes are one of the most widely used waterproofing materials in modern building engineering, and are widely used in the waterproofing and moisture-proofing of house roofs, basements, bridges, tunnels, reservoirs and other engineering projects. The core of the modified asphalt waterproofing membrane is a roll-shaped material made of asphalt as the waterproof coating, a base material as the reinforcing layer, and a surface covering material.

[0003] At present, the research on modified asphalt waterproofing membranes is relatively mature, but there are still some technical problems to be solved in the existing products and their production processes.

[0004] For example, when the modified asphalt waterproofing membrane is used in a humid environment such as a basement, mold often grows during use. The corrosion of mold can greatly reduce the performance and stability of the waterproofing membrane, making it unable to perform its intended waterproofing function and affecting the service life of the waterproofing project. Therefore, in recent years, researchers in the field have studied the mold resistance of modified asphalt waterproofing membranes from various directions.

[0005] CN110374272A discloses a mold-resistant modified asphalt waterproofing membrane, which is composed of an upper surface mold-resistant isolation layer PE film, a mold-resistant modified asphalt waterproofing upper layer, a chemical glue impregnated reinforcing base, a mold-resistant modified asphalt waterproofing lower layer, and a lower surface mold-resistant isolation layer PE film. The upper surface mold-resistant isolation layer PE film and the lower surface mold-resistant isolation layer PE film have the same material, which is a mold-resistant isolation film obtained by blowing modified high-density polyethylene. The modified high-density polyethylene is made of raw materials in mass parts: HDPE: 100 parts, reinforcing PP: 5-10 parts, heat stabilizer: 0.5-1.5 parts, and mold-resistant masterbatch: 0.5-2 parts. The modified asphalt membrane provided by the method has obvious mold resistance. However, the mold-resistant PE isolation film in the method is a non-durable layer in the structure of the membrane, which is easily damaged and fails during construction and long-term use, resulting in insufficient durability of the waterproofing membrane, and poor mold resistance of the modified asphalt layer.

[0006] Therefore, it is very important to provide a new type of asphalt waterproofing membrane with good mold resistance, excellent weather resistance, and good adhesion. SUMMARY

[0007] The purpose of the present application is to overcome the problems of existing asphalt waterproofing membranes, such as poor mold resistance, insufficient adhesion, and poor weather resistance.

[0008] To achieve the above objectives, a first aspect of the present invention provides a method for preparing modified adhesive powder, the method comprising: (1) Sunflower seed meal was soaked in water to obtain intermediate I; (2) The intermediate I was stirred with cellulase to obtain intermediate II; (3) In the presence of ethanol, the raw material rubber powder is contact-mixed with the intermediate II to obtain the modified rubber powder; the average diameter of the raw material rubber powder is 0.15-0.3 mm; The amount of cellulase used is 0.1-0.5 parts by weight relative to 100 parts by weight of the sunflower seed meal, and the amount of raw material gum powder used is 100-400 parts by weight.

[0009] A second aspect of the present invention provides a modified adhesive powder prepared by the method described in the first aspect above.

[0010] A third aspect of the present invention provides a composition for a modified bitumen coating, the composition comprising a main agent and an additive, wherein the main agent contains base bitumen, oil, a polymer modifier and modified rubber powder; Based on the total mass of the modified asphalt coating composition, the content of the base asphalt is 40-50 wt%, the content of the oil is 1-10 wt%, the content of the polymer modifier is 3-8 wt%, and the content of the modified rubber powder is 8-20 wt%. The modified adhesive powder is the modified adhesive powder described in the second aspect above.

[0011] A fourth aspect of the present invention provides a method for preparing a modified asphalt coating, the method being carried out using the components of the composition described in the third aspect above, the method comprising: stirring and mixing the components of the composition to obtain the modified asphalt coating.

[0012] A fifth aspect of the present invention provides a modified bitumen coating prepared according to the method described in the fourth aspect above.

[0013] A sixth aspect of the present invention provides a modified bitumen waterproof membrane, the modified bitumen waterproof membrane comprising a modified bitumen adhesive layer, a polyester base and a release film; the modified bitumen adhesive layer is formed from the modified bitumen coating material described in the fifth aspect above.

[0014] Through the above technical solution, the present invention has at least the following beneficial technical effects: (1) The present invention uses sunflower seed meal containing a variety of organic acids with antibacterial and desulfurization activating effects to perform specific modification treatment on raw rubber powder, and then uses the modified rubber powder obtained after modification treatment to prepare asphalt waterproof membrane. Under the premise of extremely low production cost, the modified asphalt waterproof membrane can achieve excellent antibacterial performance.

[0015] (2) The modified bitumen waterproof membrane provided by the present invention also has good adhesion and aging resistance. Detailed Implementation

[0016] The endpoints and any values ​​of the ranges disclosed herein are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of the various ranges, the endpoint values ​​of the various ranges and individual point values, and individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed herein.

[0017] As previously described, a first aspect of the present invention provides a method for preparing modified adhesive powder, the method comprising: (1) Sunflower seed meal was soaked in water to obtain intermediate I; (2) The intermediate I was stirred with cellulase to obtain intermediate II; (3) In the presence of ethanol, the raw material rubber powder is contact-mixed with the intermediate II to obtain the modified rubber powder; the average diameter of the raw material rubber powder is 0.15-0.3 mm; The amount of cellulase used is 0.1-0.5 parts by weight relative to 100 parts by weight of the sunflower seed meal, and the amount of raw material gum powder used is 100-400 parts by weight.

[0018] According to a preferred embodiment, the sunflower seed meal contains 30-35% crude protein. The inventors of this invention have discovered that, under this preferred condition, the modified bitumen waterproof membrane obtained from the modified adhesive powder provided by this invention exhibits better antibacterial properties.

[0019] According to one specific embodiment, the sunflower seed meal has an average diameter of 80-250 μm.

[0020] According to a preferred embodiment, the raw material rubber powder is tire rubber powder, and the rubber hydrocarbon content in the tire rubber powder is not less than 60 wt%. The inventors of this invention have discovered that the modified bitumen waterproof membrane obtained from the modified rubber powder provided by this invention has superior weather resistance.

[0021] According to one specific implementation, in step (1), the weight ratio of sunflower seed meal to water is 1:5-10.

[0022] According to one specific implementation, in step (3), the weight ratio of ethanol to water is 1:0.8-1.2.

[0023] In this invention, the crude protein content in the sunflower seed meal is based on the dry matter content of the sunflower seed meal, wherein the crude protein content by mass fraction is 30-35%.

[0024] In some embodiments, the soaking conditions in step (1) include: a pH value of 4.5-5.0, a temperature of 20-40°C, and a time of 0.5-2h.

[0025] According to one specific embodiment, in step (1), the pH is adjusted by using citric acid and / or sodium citrate slow-release solution to bring the pH value to the range required by the present invention.

[0026] In some embodiments, the conditions for the stirring treatment and the contact mixing each independently include: a temperature of 45-60°C and a time of 1-5 hours.

[0027] In some embodiments, step (3) further includes drying the mixture obtained after contact mixing to obtain the modified adhesive powder; the drying conditions include: pressure of 0 to 0.03 MPa, temperature of 40-60°C, and time of 6-12 h.

[0028] As previously stated, a second aspect of the present invention provides a modified adhesive powder prepared by the method described in the first aspect.

[0029] As mentioned above, a third aspect of the present invention provides a composition for a modified bitumen coating, the composition comprising a main agent and an additive, wherein the main agent contains base bitumen, oil, a polymer modifier and modified rubber powder; Based on the total mass of the modified asphalt coating composition, the content of the base asphalt is 40-50 wt%, the content of the oil is 1-10 wt%, the content of the polymer modifier is 3-8 wt%, and the content of the modified rubber powder is 8-20 wt%. The modified adhesive powder is the modified adhesive powder described in the second aspect above.

[0030] According to one specific embodiment, the base asphalt is selected from at least one of 70# asphalt, 90# asphalt, and 200# asphalt.

[0031] According to one specific embodiment, the oil is at least one of aromatic oil, base oil, and anti-corrosion oil.

[0032] According to one specific embodiment, the polymer modifier is selected from at least one of styrene-butadiene-styrene triblock copolymer, styrene-butadiene rubber, and styrene-isoprene-styrene triblock copolymer.

[0033] In some embodiments, the additives include fillers; the filler content is 20-40 wt% based on the total mass of the modified bitumen coating composition.

[0034] In some embodiments, the filler is selected from at least one of talc, superphosphate, montmorillonite, and kaolin.

[0035] According to one specific embodiment, the average diameter of the packing is 50-150 μm.

[0036] As previously stated, a fourth aspect of the present invention provides a method for preparing a modified asphalt coating, the method being carried out using the components of the composition described in the third aspect above, the method comprising: stirring and mixing the components of the composition to obtain the modified asphalt coating.

[0037] According to one specific embodiment, the mixing conditions include: a temperature of 150-180°C and a time of 5-8 hours.

[0038] According to one specific embodiment, the steps for preparing the modified asphalt coating material include: S1: Add the base asphalt and oil to a reactor preheated to 150-160℃ and stir for 10-30 minutes to obtain material I; S2: At 170-180℃, the polymer modifier is mixed with material I for 0.5-2 hours to obtain material II; S3: Maintain the temperature at 170-180℃, mix the modified adhesive powder with material II for 1-5 hours to obtain material III; S4: Maintain the temperature at 170-180℃, and stir and mix the filler with the material III for 0.5-2 hours to obtain the modified asphalt coating material.

[0039] As previously stated, the fifth aspect of the present invention provides a modified bitumen coating prepared according to the method described in the fourth aspect above.

[0040] As previously stated, a sixth aspect of the present invention provides a modified bitumen waterproof membrane, the modified bitumen waterproof membrane comprising a modified bitumen adhesive layer, a polyester base and a release liner; the modified bitumen adhesive layer is formed from the modified bitumen coating material described in the fifth aspect above.

[0041] According to one specific embodiment, the separator is selected from PE film and / or EVA film.

[0042] According to one specific embodiment, the polyester base material is 180g / m² pre-impregnated with matrix bitumen. 2 -310g / m 2Long-fiber polyester tire.

[0043] To provide a clearer understanding of the technical features, objectives, and beneficial effects of this invention, the invention is now described in detail through embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention, and the scope of protection of this invention is not limited to the following description. In the following examples, unless otherwise specified, all raw materials and reagents used are common commercially available products.

[0044] The following examples include some of the raw materials used and their sources: Sunflower seed meal-I: with an average diameter of 150μm and a crude protein content of 33%, purchased from Guangzhou Luxin Oil Company.

[0045] Sunflower seed meal-II: with an average diameter of 120μm and a crude protein content of 21%, purchased from Huamo Biotechnology Co., Ltd.

[0046] Raw material rubber powder-I: Tire rubber powder, with an average diameter of 0.18 mm and a rubber hydrocarbon content of 78%, purchased from Sichuan Zhongyu Rubber & Plastic New Materials Co., Ltd. Raw material rubber powder-II: Tire rubber powder, with an average diameter of 0.3 mm and a rubber hydrocarbon content of 40%, purchased from Hubei Hedeli Recycling Technology Co., Ltd. Raw material rubber powder-III: EPDM rubber powder, with an average diameter of 0.3 mm and a rubber hydrocarbon content of 65%, purchased from Hebei Suiliyang Company; Raw material rubber powder-IV: Tire rubber powder, with an average diameter of 0.9 mm and a rubber hydrocarbon content of 40%, purchased from Hubei Hedeli Recycling Technology Co., Ltd. Cellulase: powder, CAS No.: 9012-54-8, purchased from McLean Company; Base asphalt-I: A combination of 70# asphalt and 200# asphalt in a mass ratio of 3:1, with both 70# and 200# asphalt purchased from Jingbo Petrochemical. Aromatic oil: purchased from Guangzhou Dagang Petroleum Technology Co., Ltd.; Base oil: purchased from Hunan Zhongbao Chemical Co., Ltd.; Oil content - I: A combination of aromatic oil and base oil in a mass ratio of 1:1; Styrene-butadiene-styrene triblock copolymer (SBS): Grade 411#, purchased from LG Corporation; Styrene-butadiene rubber (SBR): Grade 095#, purchased from Haifang Technology Co., Ltd. Styrene-isoprene-styrene triblock copolymer (SIS): Grade 1105#, purchased from Yueyang Petrochemical Company; Polymer Modifier-I: A combination of SBS, SBR and SIS in a mass ratio of 4:1:1; Polymer Modifier-II: A combination of SBS and SIS in a mass ratio of 1:1; Wood dust: average diameter 0.3mm, purchased from Lingshou Chengyang Mining Company; Trihydrate: average diameter 74μm, purchased from Xufeng Powder Co., Ltd.; Talc powder: average diameter 150μm, purchased from Qixia Rongguan Company; Release film: PE film, purchased from Cangzhou Zhaoyang Paper & Plastic Co., Ltd.

[0047] Preparation Example 1 This preparation example illustrates the preparation of the modified adhesive powder provided by the present invention, including the following steps: (1) Take 100 parts by weight of sunflower seed meal-I and place it in a container. Add 500 parts by weight of water for soaking. Adjust the pH of the soaking solution to 4.8 using sodium citrate slow-release solution. Then soak at 30°C for 1 hour to obtain intermediate I. (2) Adjust the temperature to 50°C, and mix 0.3 parts by weight of cellulase with intermediate I for 3 hours to obtain intermediate II; (3) Adjust the temperature to 55°C, and ultrasonically mix 500 parts by weight of ethanol, 200 parts by weight of raw material rubber powder-I and intermediate II for 3 hours. Then dry the mixture at 0.01 MPa and 50°C for 6 hours to obtain modified rubber powder-I.

[0048] Preparation Example 2 (1) Take 100 parts by weight of sunflower seed meal-I and place it in a container. Add 800 parts by weight of water for soaking. Adjust the pH of the soaking solution to 5.0 using sodium citrate slow-release solution. Then soak at 40°C for 0.5 h to obtain intermediate I. (2) Adjust the temperature to 55°C, and stir and mix 0.3 parts by weight of cellulase with intermediate I for 4 hours to obtain intermediate II; (3) Adjust the temperature to 60°C, and ultrasonically mix 800 parts by weight of ethanol, 300 parts by weight of raw material rubber powder-I and intermediate II for 1 hour. Then dry the resulting mixture at 0.01 MPa and 40°C for 12 hours to obtain modified rubber powder-II.

[0049] Preparation Example 3 This preparation example is carried out using a method similar to that of Preparation Example 1. The difference is that in step (1), an equal weight portion of sunflower seed meal-II is used to replace sunflower seed meal-I in Preparation Example 1. The remaining operations are the same as in Preparation Example 1, and modified rubber powder-III is obtained.

[0050] Preparation Example 4 This preparation example is carried out using a method similar to that of Preparation Example 1. The difference is that in step (3), an equal weight of raw material rubber powder-II is used to replace the raw material rubber powder-I in Preparation Example 1. The remaining operations are the same as in Preparation Example 1, and modified rubber powder-IV is obtained.

[0051] Preparation Example 5 This preparation example is carried out using a method similar to that of Preparation Example 1. The difference is that in step (3), an equal weight portion of raw material rubber powder-III is used to replace the raw material rubber powder-I in Preparation Example 1. The remaining operations are the same as in Preparation Example 1, and modified rubber powder-V is obtained.

[0052] Comparative Preparation Example 1 This comparative preparation example was prepared using a method similar to that of Preparation Example 1. The difference was that in step (3), an equal weight of raw material rubber powder-IV was used to replace the raw material rubber powder-I in Preparation Example 1. The remaining operations were the same as in Preparation Example 1, and modified rubber powder-DI was obtained.

[0053] Comparative Preparation Example 2 This comparative preparation example was prepared using a method similar to that of Preparation Example 1. The difference was that in step (3), the amount of raw material rubber powder-I was adjusted to 800 parts by weight, and the remaining operations were the same as in Preparation Example 1, to obtain modified rubber powder-DII.

[0054] Comparative preparation example 3 This comparative preparation example was prepared using a method similar to that of Preparation Example 1. The difference was that sunflower seed meal-I was not added, while the amounts and conditions of the other substances were the same as in Preparation Example 1, resulting in modified rubber powder-DIII.

[0055] Comparative preparation example 4 This comparative preparation example was prepared using a method similar to that of Preparation Example 1. The difference was that an equal amount of heavy calcium carbonate was used to replace sunflower seed meal-I in Preparation Example 1, while the amounts and conditions of the other substances were the same as in Preparation Example 1, resulting in modified rubber powder-DIV.

[0056] Comparative preparation example 5 This comparative preparation example was prepared using a method similar to that of Preparation Example 1. The difference was that an equal part by weight of sawdust powder was used to replace sunflower seed meal-I in Preparation Example 1, while the amounts and conditions of the other substances were the same as in Preparation Example 1, resulting in modified adhesive powder-DV.

[0057] The following examples illustrate the preparation of modified bitumen waterproof membranes, specifically: Example 1 (1) Add the base asphalt and oil to a reactor preheated to 150°C and stir for 20 min to obtain material I; (2) Adjust the temperature to 170℃, stir and mix the polymer modifier with the material I for 1 hour to obtain material II; (3) Keep the temperature at 170℃ and stir and mix the modified adhesive powder with the material II for 3 hours to obtain material III; (4) Keep the temperature at 170°C and stir and mix the filler with the material III for 1 hour to obtain the modified asphalt coating material; (5) In 250g / m² pre-impregnated with 70# asphalt 2 The material is formed by extruding material from both sides of a polyester substrate, controlling the thickness of the roll to about 3mm, and then covering both sides with a release film to produce a modified bitumen waterproof roll.

[0058] The specific component types, dosages, and process parameters of this embodiment are shown in Table 1.

[0059] Unless otherwise specified, Examples 2 and 3 are carried out with reference to the method of Example 1. The difference is that the types of components, dosages and process parameters used in the examples are not exactly the same, as detailed in Table 1.

[0060] Table 1

[0061] Example 4 This embodiment is carried out using a method similar to that of Embodiment 1, except that an equal weight portion of modified adhesive powder-III is used to replace modified adhesive powder-I in Embodiment 1. The remaining operations and conditions are the same as in Embodiment 1, and modified bitumen waterproof membrane is prepared.

[0062] Example 5 This embodiment is carried out using a method similar to that of Embodiment 1, except that an equal weight portion of modified adhesive powder-IV is used to replace modified adhesive powder-I in Embodiment 1. The remaining operations and conditions are the same as in Embodiment 1, and modified bitumen waterproof membrane is prepared.

[0063] Example 6 This embodiment is carried out using a method similar to that of Embodiment 1, except that an equal weight portion of modified adhesive powder-V is used to replace modified adhesive powder-I in Embodiment 1. The remaining operations and conditions are the same as in Embodiment 1, and modified bitumen waterproof membrane is prepared.

[0064] Comparative Example 1 This comparative example was prepared using a method similar to that of Example 1, except that an equal weight of modified adhesive powder-DI was used instead of modified adhesive powder-I in Example 1. The remaining operations and conditions were the same as in Example 1, and modified bitumen waterproof membrane was prepared.

[0065] Comparative Example 2 This comparative example was prepared using a method similar to that of Example 1, except that an equal weight portion of modified adhesive powder-DII was used instead of modified adhesive powder-I in Example 1. The remaining operations and conditions were the same as in Example 1, and modified bitumen waterproof membrane was prepared.

[0066] Comparative Example 3 This comparative example was prepared using a method similar to that of Example 1, except that an equal weight portion of modified adhesive powder-DIII was used to replace modified adhesive powder-I in Example 1. The remaining operations and conditions were the same as in Example 1, and modified bitumen waterproof membrane was prepared.

[0067] Comparative Example 4 This comparative example was prepared using a method similar to that of Example 1, except that an equal weight portion of modified adhesive powder-DIV was used to replace modified adhesive powder-I in Example 1. The remaining operations and conditions were the same as in Example 1, and modified bitumen waterproof membrane was prepared.

[0068] Comparative Example 5 This comparative example was prepared using a method similar to that of Example 1, except that an equal weight portion of modified adhesive powder-DV was used to replace modified adhesive powder-I in Example 1. The remaining operations and conditions were the same as in Example 1, and modified bitumen waterproof membrane was prepared.

[0069] Comparative Example 6 This comparative example was prepared using a method similar to that of Example 1, except that an equal weight portion of raw material adhesive powder-I was used to replace the modified adhesive powder-I in Example 1. The remaining operations and conditions were the same as in Example 1, and the modified bitumen waterproof membrane was prepared.

[0070] Test case The modified bitumen waterproof membrane prepared above was subjected to antibacterial tests, peel strength tests, and low-temperature flexibility tests under heat aging conditions, specifically: Antibacterial test: Referring to the GB / T 21866-2008 test standard, Staphylococcus aureus was selected as the test bacteria to test the antibacterial rate of the modified bitumen waterproof membrane; Peel strength test: Refer to GB / T 328.20-2007 test standard; Thermal aging low-temperature flexibility test: Referring to the GB 18242-2008 test standard, the low-temperature flexibility limit of the modified bitumen waterproof membrane after 20 days of thermal aging was tested.

[0071] The specific test results are shown in Table 2.

[0072] Table 2

[0073] As can be seen from the results in Table 2, the modified bitumen waterproof membrane prepared using the modified adhesive powder provided by this invention has excellent antibacterial properties, while also possessing good adhesion and aging resistance.

[0074] The preferred embodiments of the present invention have been described in detail above; however, the present invention is not limited thereto. Within the scope of the inventive concept, various simple modifications can be made to the technical solutions of the present invention, including combinations of various technical features in any other suitable manner. These simple modifications and combinations should also be considered as the content disclosed in the present invention and are all within the protection scope of the present invention.

Claims

1. A method for preparing a modified crumb rubber, characterized by, The method comprises: (1) soaking sunflower seed meal in the presence of water to obtain intermediate I; (2) stirring intermediate I with cellulase to obtain intermediate II; (3) mixing raw rubber powder with intermediate II in the presence of ethanol to obtain the modified rubber powder; the average diameter of the raw rubber powder is 0.15-0.3 mm; The amount of cellulase is 0.1-0.5 parts by weight relative to 100 parts by weight of the sunflower seed meal, and the amount of raw rubber powder is 100-400 parts by weight.

2. The method of claim 1, wherein, The crude protein content in the sunflower seed meal is 30-35%; And / or, the raw rubber powder is tire rubber powder, and the rubber hydrocarbon content in the tire rubber powder is not less than 60 wt%; And / or, in step (1), the weight ratio of the amount of sunflower seed meal to the amount of water is 1:5-10; And / or, in step (3), the weight ratio of the amount of ethanol to the amount of water is 1:0.8-1.

2.

3. The method of claim 1 or 2, wherein, In step (1), the conditions of the soaking treatment include that the pH value is 4.5-5.0, the temperature is 20-40℃, and the time is 0.5-2 h; And / or, the conditions of the stirring treatment and the conditions of the contact mixing are each independently that the temperature is 45-60℃, and the time is 1-5 h.

4. The modified rubber powder prepared by the method of any one of claims 1-3.

5. A composition for a modified bituminous coating, characterized by comprising The composition comprises a main agent and an auxiliary agent, the main agent contains base asphalt, oil, high molecular modifier and modified rubber powder; The content of the base asphalt is 40-50 wt% based on the total mass of the modified asphalt coating composition, the content of the oil is 1-10 wt%, the content of the high molecular modifier is 3-8 wt%, and the content of the modified rubber powder is 8-20 wt%; The modified rubber powder is the modified rubber powder of claim 4.

6. The composition of claim 5, wherein, The base asphalt is selected from at least one of 70# asphalt, 90# asphalt and 200# asphalt; And / or, the oil is at least one of aromatic oil, base oil and thread cutting oil; And / or, the high molecular modifier is at least one of styrene-butadiene-styrene triblock copolymer, styrene-butadiene rubber and styrene-isoprene-styrene triblock copolymer.

7. The composition according to claim 5 or 6, wherein, The auxiliary agent comprises a filler; The content of the filler is 20-40 wt% based on the total mass of the modified asphalt coating composition; And / or, the filler is at least one of talc, heavy calcium, montmorillonite and kaolin.

8. A method of preparing a modified bituminous coating, characterized in that, The method applies the components in the composition of any one of claims 5-7, and the method comprises stirring and mixing the components in the composition to obtain the modified asphalt coating; And / or, the conditions of the stirring and mixing include that the temperature is 150-180℃, and the time is 5-8 h.

9. The modified asphalt coating prepared by the method of claim 8.

10. A modified bitumen waterproofing membrane characterized in that, The modified asphalt waterproof coiled material comprises a modified asphalt rubber layer, a polyester base and a release film; the modified asphalt rubber layer is formed by the modified asphalt coating of claim 9. And / or, the barrier film is selected from a PE film and / or an EVA film.

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