Energy-saving reflective polyolefin composite modified asphalt waterproofing membrane, preparation method and application thereof

Abstract

The present application relates to a kind of polyolefin composite modified asphalt waterproofing membrane and its preparation method and application, including from top to bottom sequentially arranged reflective polyolefin elastomer layer, barrier bonding layer, modified asphalt layer and anti-sticking layer, the raw material of reflective polyolefin elastomer layer includes thermoplastic polyolefin elastomer, macromolecular compatibilizer, reflective filler and thermal radiation filler, wherein, the mass ratio of thermoplastic polyolefin elastomer, macromolecular compatibilizer, reflective filler and thermal radiation filler is 1:0.01~0.5:0.05~1:0.01~0.5, reflective filler includes visible light reflective filler and near-infrared light reflective filler, the mass ratio of visible light reflective filler and near-infrared light reflective filler is 1:0.2~5.The waterproofing membrane of the present application uses specific reflective polyolefin elastomer layer as face film modified asphalt waterproofing membrane, not only with asphalt glue layer adhesion good, while solar reflectivity is big, hemispherical emissivity is high, it is favorable for the energy saving and heat preservation of building roof.

Description

Technical Field

[0001] This invention belongs to the field of building waterproofing materials technology, specifically relating to an energy-saving reflective polyolefin composite modified bitumen waterproof membrane and its preparation method. Background Technology

[0002] Modified bitumen waterproof membranes are widely used in waterproofing projects for various buildings and structures, such as roofs, basements, side walls, subways, tunnels, and bridges, due to their lower manufacturing costs and high waterproofing reliability. They currently occupy a major share of the domestic waterproofing materials market. However, because bitumen materials are not resistant to aging, modified bitumen waterproof membranes are mainly used in non-exposed applications. When used for roof waterproofing, they often require an additional cement mortar protective layer.

[0003] Currently, only modified bitumen waterproof membranes with surface mineral granules can be used for exposed waterproofing. However, these modified bitumen waterproof membranes also have the following disadvantages: (1) The mineral granules have poor adhesion and are prone to falling off during transportation and use; (2) The modified bitumen waterproof membranes have poor aging resistance. Although there is a certain amount of mineral granule protection on the surface, some bitumen is still in direct contact with the external environment. Under the influence of external water, oxygen, and sunlight, it will gradually age, powder and harden, produce cracks, and eventually lose its waterproof performance. The peeling off of the mineral granules will also accelerate this process. In addition, since the mineral granules are often dark in color and have low solar reflectivity, the heat is absorbed by the bitumen layer, which also continuously aggravates the aging of the modified bitumen waterproof membrane and is not conducive to the thermal insulation of the roof. Summary of the Invention

[0004] The technical problem actually solved by this invention is the poor adhesion, poor aging resistance, and low solar reflectivity of existing modified bitumen waterproof membranes with mineral granule surface when used in the open. The invention provides an energy-saving reflective polyolefin composite modified bitumen waterproof membrane for open use.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] A polyolefin composite modified bitumen waterproof membrane includes, from top to bottom, a reflective polyolefin elastomer layer, a barrier adhesive layer, a modified bitumen layer, and an anti-adhesive layer. The raw materials of the reflective polyolefin elastomer layer include thermoplastic polyolefin elastomer, polymer compatibilizer, reflective filler, and thermal radiation filler. The mass ratio of the thermoplastic polyolefin elastomer, polymer compatibilizer, reflective filler, and thermal radiation filler is 1:0.01-0.5:0.05-1:0.01-0.5. The reflective filler includes visible light reflective filler and near-infrared light reflective filler, and the mass ratio of the visible light reflective filler and near-infrared light reflective filler is 1:0.2-5.

[0007] The thermoplastic polyolefin elastomer is a polyolefin elastomer prepared by reactor synthesis.

[0008] According to some embodiments of the present invention, the medium particle size D of the visible light reflective filler 50 The medium particle size D of the near-infrared light reflective filler is 200-350 nm. 50 The wavelength is 500-1100nm.

[0009] In some specific embodiments, the visible light reflective filler is rutile nano-titanium dioxide; the near-infrared light reflective filler is rutile nano-titanium dioxide.

[0010] In some specific embodiments, the polymer compatibilizer is one or a combination of maleic anhydride-grafted polypropylene and methyl methacrylate-grafted polypropylene.

[0011] In some specific embodiments, the particle size of the thermal radiation filler is 5–40 μm.

[0012] In some specific embodiments, the thermal radiation filler is at least one selected from ZrO2, Fe2O3, Cr2O, SiO2, MnO2, NiO, Co2O3, and CuO.

[0013] In some specific embodiments, the raw material formulation of the reflective polyolefin elastomer layer, by weight, includes:

[0014]

[0015] In some specific embodiments, the thermoplastic resin is polypropylene.

[0016] In some specific embodiments, the raw materials of the reflective polyolefin elastomer layer also include additives, which include one or more of light stabilizers and antioxidants, and the amount of the additives is 0.3 to 2 parts.

[0017] In some specific embodiments, the thickness of the reflective polyolefin elastomer layer is 0.05 to 0.4 mm.

[0018] In some specific embodiments, the barrier adhesive layer is a polyamide layer with a thickness of 0.02 to 0.12 mm.

[0019] According to some embodiments of the present invention, a high-strength, high-viscosity modifier is added to the modified asphalt layer, wherein the high-strength, high-viscosity modifier is an ethylene-acrylate copolymer. Further, the ethylene-acrylate copolymer is at least one selected from ethylene-methacrylate copolymer, ethylene-ethyl acrylate copolymer, and ethylene-butyl acrylate copolymer.

[0020] Adding high-strength, high-viscosity modifiers to modified asphalt layers helps improve the cohesive strength and heat resistance of the modified asphalt layers, while also improving their excellent adhesion to the base layer or roll material.

[0021] According to some embodiments of the present invention, the raw material of the modified asphalt layer contains asphalt, and the mass ratio of the asphalt to the high-strength, high-viscosity modifier is 1:0.03 to 0.2.

[0022] According to some embodiments of the present invention, the modified asphalt layer includes a first modified asphalt rubber layer, a polyester base layer, and a second modified asphalt rubber layer stacked sequentially. The high-strength and high-viscosity modifier is added to the first modified asphalt rubber layer and the second modified asphalt rubber layer, respectively. The first modified asphalt rubber layer is disposed between the barrier adhesive layer and the polyester base layer, and the anti-adhesion layer is disposed on the second modified asphalt rubber layer.

[0023] In some specific embodiments, by weight, the raw materials of the first modified asphalt rubber layer and the second modified asphalt rubber layer each independently include: 30-50 parts of petroleum asphalt, 8-15 parts of plasticizer, 5-15 parts of rubber modifier, 2-5 parts of high-strength and high-viscosity modifier, 2-5 parts of tackifying resin, 5-10 parts of tire rubber powder, and 15-40 parts of filler.

[0024] In some specific embodiments, the petroleum asphalt is at least one of 70# and 90# petroleum asphalt.

[0025] In some specific embodiments, the plasticizer is at least one of paraffin oil or naphthenic oil.

[0026] In some specific embodiments, in the first modified asphalt rubber layer and the second modified asphalt rubber layer, the rubber modifier is at least one of SBS, SEBS, and SBR, and the filler is at least one of talc, heavy calcium carbonate, light calcium carbonate, montmorillonite, and kaolin.

[0027] In some specific embodiments, the tackifying resin is at least one of C5 petroleum resin, C9 petroleum resin, C5 / C9 copolymer petroleum resin, rosin resin, and hydrogenated rosin resin.

[0028] In some specific embodiments, the thicknesses of the first modified asphalt binder layer and the second modified asphalt binder layer are 1.0 to 1.5 mm, respectively.

[0029] In some specific embodiments, the anti-stick layer is a PE film or a release film.

[0030] In some specific embodiments, the thickness of the polyolefin composite modified bitumen waterproof membrane is 3.0 to 4.5 mm.

[0031] The second technical solution adopted by the present invention is: a method for preparing the above-mentioned polyolefin composite modified bitumen waterproof membrane, the preparation method comprising the following steps:

[0032] (1) Preparation of reflective polyolefin elastomer layer

[0033] The resin material is added to an extruder, mixed, extruded, and granulated to obtain a resin mixture, wherein the resin material includes a thermoplastic polyolefin elastomer and a polymer compatibilizer;

[0034] The powders are mixed to obtain a powder mixture, wherein the powders include reflective fillers and thermal radiation fillers;

[0035] The resin mixture and powder mixture are added to an extruder, extruded, calendered, and cooled to produce polyolefin elastomer sheets;

[0036] (2) Preparation of waterproof membrane

[0037] On a modified bitumen roll production line, modified bitumen adhesive is coated on the upper and lower surfaces of the base material, and then the polyolefin elastomer sheet is laminated on the upper surface and an anti-sticking layer is laminated on the lower surface to obtain the polyolefin composite modified bitumen waterproof roll.

[0038] The third technical solution adopted by the present invention is the application of the above-mentioned polyolefin composite modified bitumen waterproof membrane in the field of building or structure waterproofing, wherein the polyolefin composite modified bitumen waterproof membrane is used for exposed waterproofing.

[0039] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art:

[0040] The waterproof membrane of this invention uses a specific reflective polyolefin elastomer layer as the face film of the modified bitumen waterproof membrane. It not only has good adhesion to the bitumen adhesive layer, but also has high solar reflectivity and high hemispherical emissivity, which is beneficial to the energy-saving and heat-insulating properties of building roofs. Detailed Implementation

[0041] Existing modified bitumen waterproof membranes for exposed applications suffer from poor adhesion, poor aging resistance, and low solar reflectivity. This invention addresses these issues by using a specific reflective polyolefin elastomer layer combined with a barrier adhesive layer and a high-performance modified bitumen layer to prepare a polyolefin composite modified bitumen waterproof membrane. Firstly, the use of an energy-saving reflective polyolefin elastomer layer as the surface film of the waterproof membrane provides good adhesion to the bitumen adhesive layer and high solar reflectivity, overcoming the poor adhesion and low solar reflectivity problems of conventional mineral particle surface modified bitumen waterproof membranes, thus contributing to energy-saving insulation of building roofs. Secondly, the membrane is prepared using a compound of visible light reflective fillers, near-infrared light reflective fillers, and thermal radiation fillers. The reflective polyolefin elastomer layer, with its combination of visible light reflective filler and near-infrared light reflective filler, ensures that the reflective polyolefin elastomer layer reflects most of the visible and near-infrared light in sunlight. Simultaneously, the thermal radiation filler radiates away the remaining absorbed solar heat, further enhancing the thermal insulation effect of the reflective polyolefin elastomer layer. Thirdly, the use of polymer compatibilizers improves the compatibility between the resin and filler in the reflective polyolefin elastomer layer, increasing their bonding strength. This not only effectively increases the amount of filler added but also improves the density of the reflective polyolefin elastomer layer, further enhancing its energy-saving reflective effect.

[0042] A further concept of this invention lies in optimizing the formulation of modified asphalt adhesives by using ethylene-acrylate copolymers such as ethylene-methacrylate copolymers, ethylene-ethyl acrylate copolymers, and ethylene-butyl acrylate copolymers to modify the asphalt. Firstly, since ethylene-acrylate copolymers contain both non-polar and polar segments, they can effectively improve the bonding force between the modified asphalt and fillers in the modified asphalt adhesive, thereby improving the density, cohesive strength, and heat resistance of the modified asphalt adhesive. Secondly, because the polar segments in ethylene-acrylate copolymers have good adhesion to substrates such as metals and concrete, the roll material can be installed using self-adhesive or wet-lay methods and also exhibits excellent adhesion to the substrate.

[0043] The technical solutions of the present invention will be described in detail below with reference to specific embodiments, so that those skilled in the art can better understand and implement the technical solutions of the present invention, but the present invention is not limited to the scope of the examples described.

[0044] Example 1

[0045] The energy-saving reflective polyolefin composite modified bitumen waterproof membrane provided in this embodiment has a thickness of 4mm and includes a reflective polyolefin elastomer layer, a barrier adhesive layer, a first modified bitumen adhesive layer, a polyester base layer, a second modified bitumen adhesive layer, and an anti-adhesive layer stacked sequentially from top to bottom. The raw material formula of the reflective polyolefin elastomer layer is shown in Table 1.

[0046] The thickness of the reflective polyolefin elastomer layer is 0.2 mm, wherein the polyolefin elastomer is a reactor-polymerized thermoplastic polyolefin HifaxCA10A, purchased from Basel.

[0047] The thermoplastic resin is polypropylene;

[0048] The polymer compatibilizer is maleic anhydride-grafted polypropylene;

[0049] The visible light reflective filler is rutile titanium dioxide with a medium particle size of 260 nm;

[0050] The near-infrared light reflective filler is rutile titanium dioxide with a medium particle size of 700 nm;

[0051] The thermal radiation filler is SiO2.

[0052] The light stabilizer is selected from hindered amine light stabilizers;

[0053] The antioxidant is 2,6-bis(1,1-dimethylethyl)-4-methylphenol.

[0054] The barrier adhesive layer is a polyamide layer with a thickness of 0.06 mm.

[0055] The thicknesses of the first and second high-performance modified asphalt binder layers are both 1.4 mm, and their raw material formulations are as follows:

[0056] 40 parts of petroleum asphalt (70#), 10 parts of plasticizer (paraffin oil), 4 parts of thermoplastic elastomer (SBS411), 3 parts of styrene-butadiene rubber (SBR), 3 parts of high-strength and high-viscosity modifier (ethylene-ethyl acrylate copolymer), 3 parts of tackifying resin (C5 petroleum resin), 10 parts of 60-mesh tire rubber powder, and 27 parts of filler (talc).

[0057] The preparation method of the energy-saving reflective polyolefin composite modified bitumen waterproof membrane in this embodiment is as follows:

[0058] (1) Preparation of reflective polyolefin elastomer layer

[0059] Polyolefin elastomer, thermoplastic resin and polymer compatibilizer are added to a high-speed mixer and mixed evenly at room temperature. Then, the mixture is fed into the main feed port of a twin-screw extruder for co-mixing and granulation to obtain a resin mixture.

[0060] Visible light reflective filler, near-infrared light reflective filler, thermal radiation filler, light stabilizer, and antioxidant are added to a high-speed mixer and mixed evenly at room temperature to obtain a powder mixture. The extruder's processing temperature is 180–190℃, the screw speed is 80 rpm, the traction speed is 12 m / min, and the particle size of the granulated material is controlled to be approximately 6 mm.

[0061] The resin mixture is added to the main feed port of the twin-screw extruder, and the powder is added to the side feed port. The mixture is melted and extruded into sheets through the extruder, and then calendered and cooled by a three-roll system. After cooling, the sheets are wound up. The processing temperature of the extruder is 180℃~190℃, the screw speed is 15rpm, the traction speed is 0.9m / min, and the tension is controlled at 10N±5N.

[0062] (2) Preparation of high-performance modified asphalt

[0063] Petroleum asphalt and plasticizer are added to a reactor and stirred and dehydrated at 135-140℃ for 30 minutes. Then, thermoplastic elastomer, styrene-butadiene rubber, high-strength and high-viscosity modifier and tire rubber powder are added. The temperature is raised to 185℃ and sheared and mixed for 3 hours. Then, petroleum resin is added and sheared and mixed for 0.5 hours. Finally, filler is added and stirred and mixed for 1 hour to obtain high-performance modified asphalt compound.

[0064] (3) Preparation of waterproof membrane

[0065] On the modified bitumen roll production line, the high-performance modified bitumen compound prepared in step (2) is added to the impregnation tank and the temperature is controlled at 170-180℃. Then, the upper and lower surfaces of the polyester base are covered and formed. The sheet prepared in step (1) is covered on the upper surface and the PE isolation film is covered on the lower surface to obtain the energy-saving reflective polyolefin composite modified bitumen waterproof roll.

[0066] Example 2

[0067] The energy-saving reflective polyolefin composite modified bitumen waterproof membrane provided in this embodiment is basically the same as that in embodiment 1, except that: the raw material formula of the polyolefin elastomer layer is shown in Table 1, and the polyolefin elastomer is a reactor-polymerized thermoplastic polyolefin Hifax CA60A, which was purchased from Basel.

[0068] Example 3

[0069] The energy-saving reflective polyolefin composite modified bitumen waterproof membrane provided in this embodiment is basically the same as that in Embodiment 1, except that the raw material formula of the polyolefin elastomer layer is shown in Table 1, and the polyolefin elastomer is POE6202, which was purchased from Exxon Chemical.

[0070] Example 4

[0071] The energy-saving reflective polyolefin composite modified bitumen waterproof membrane provided in this embodiment is basically the same as that in Embodiment 1, except that the raw material formula of the polyolefin elastomer layer is shown in Table 1. Specifically, the medium particle size D of the visible light reflective filler... 50 The near-infrared light reflective filler is rutile titanium dioxide with a medium particle size of 1000 nm, and the thermal radiation filler is ZrO2.

[0072] Example 5

[0073] The energy-saving reflective polyolefin composite modified bitumen waterproof membrane provided in this embodiment is basically the same as that in Embodiment 1, except that:

[0074] The raw material formula for the high-performance modified asphalt layer is as follows: 50 parts of petroleum asphalt (90#), 14 parts of plasticizer (paraffin oil), 4 parts of thermoplastic elastomer (SBS411), 3 parts of styrene-butadiene rubber (SBR), 4 parts of high-strength and high-viscosity modifier (ethylene-butyl acrylate copolymer), 5 parts of tackifying resin (C9 petroleum resin), 5 parts of 60-mesh tire rubber powder, and 10 parts of filler (talc).

[0075] Example 6

[0076] The energy-saving reflective polyolefin composite modified bitumen waterproof membrane provided in this embodiment is basically the same as that in Embodiment 1, except that no thermoplastic resin is added, that is, the amount of polypropylene is 0.

[0077] Comparative Example 1

[0078] The energy-saving reflective polyolefin composite modified bitumen waterproof membrane provided in this comparative example is basically the same as that in Example 1, except that the raw material formula of the polyolefin elastomer layer is shown in Table 1. Specifically, the amount of visible light reflective filler added is 10 parts, and the amount of near-infrared light reflective filler added is 0 parts.

[0079] Comparative Example 2

[0080] The energy-saving reflective polyolefin composite modified bitumen waterproof membrane provided in this comparative example is basically the same as that in Example 1, except that the raw material formula of the polyolefin elastomer layer is shown in Table 1. Specifically, the amount of visible light reflective filler added is 0 parts, and the amount of near-infrared light reflective filler added is 10 parts.

[0081] Comparative Example 3

[0082] The energy-saving reflective polyolefin composite modified bitumen waterproof membrane provided in this comparative example is basically the same as that in Example 1, except that the raw material formula of the polyolefin elastomer layer is shown in Table 1. Specifically, the amount of visible light reflective filler and near-infrared light reflective filler added is 7.5 parts each, and the amount of thermal radiation filler added is 0.

[0083] Comparative Example 4

[0084] The energy-saving reflective polyolefin composite modified bitumen waterproof membrane provided in this comparative example is basically the same as that in Example 1, except that:

[0085] The raw material formula for the high-performance modified asphalt layer is as follows: 40 parts petroleum asphalt, 10 parts plasticizer (paraffin oil), 4 parts thermoplastic elastomer (SBS411), 3 parts styrene-butadiene rubber (SBR), 3 parts tackifying resin (C5 petroleum resin), 10 parts 60-mesh tire rubber powder, and 30 parts filler (talc).

[0086] Comparative Example 5

[0087] The energy-saving reflective polyolefin composite modified bitumen waterproof membrane provided in this comparative example is basically the same as that in Example 1, except that the raw material formula of the polyolefin elastomer layer is shown in Table 1, and no polymer compatibilizer is added.

[0088] Table 1. Raw material formulations (parts by weight) of polyolefin elastomer layers in Examples 1-6 and Comparative Examples 1-5.

[0089]

[0090] For the waterproof membranes of Examples 1-6 and Comparative Examples 1-5, the solar reflectivity and hemispherical emissivity were tested according to Appendices B and C of JG / T 235-2014 "Building Reflective Thermal Insulation Coatings", the heat resistance was tested according to GB 18242-2008 "Elastomer SBS Modified Bituminous Waterproof Membrane", and the peel strength between membranes and peel strength between membrane and aluminum plate were tested according to GB T 23260-2009 "Waterproof Membrane with Self-Adhesive Layer". The results are shown in Table 2.

[0091] Table 2. Performance test results of waterproof membranes in Examples 1-6 and Comparative Examples 1-5

[0092]

[0093]

[0094] The results show that in the preparation of the polyolefin elastomer layer in Examples 1-6, when maleic anhydride-grafted polypropylene was used as the polymer compatibilizer, rutile titanium dioxide with a medium particle size of 260 nm was used as the visible light reflective filler, rutile titanium dioxide with a medium particle size of 700 nm was used as the near-infrared light reflective filler, and SiO2 was used as the thermal radiation filler, the solar reflectivity of the roll material was all above 74%, and the hemispherical emissivity was above 85%. This indicates that the energy-saving reflective polyolefin composite modified bitumen waterproof roll material prepared by the present invention has good reflective heat insulation performance.

[0095] Compared with Example 1, Comparative Examples 1 and 2 added only near-infrared light reflective filler or visible light reflective filler when preparing polyolefin elastomer layers. Since nano-titanium dioxide of different particle sizes has inconsistent reflectivity for different wavelengths of sunlight, the solar reflectivity decreased to below 70%, and the hemispherical emissivity also decreased to 78% and 80%, respectively.

[0096] Compared with Example 1, Comparative Example 3 increased the content of near-infrared light reflective filler and visible light reflective filler when preparing the polyolefin elastomer layer, but did not add thermal radiation filler. Due to the increase in the content of light reflective filler, the solar reflectivity was further increased to 82%. However, since no thermal radiation filler was added to the formula, the heat absorbed in the system could not be effectively dissipated in the form of thermal radiation, and the hemispherical emissivity decreased to 72%, affecting the reflective heat insulation effect of the roll material.

[0097] Compared with Example 1, Comparative Example 5 did not add a polymer compatibilizer when preparing the polyolefin elastomer layer. Due to the large amount of light-emitting filler and thermal radiation filler added, on the one hand, the filler could not be effectively and uniformly dispersed in the resin system, and on the other hand, it affected the density of the polyolefin elastomer layer, resulting in a decrease in solar reflectivity and hemispherical emissivity.

[0098] In Examples 1-6 and Comparative Examples 1-3, ethylene-acrylate copolymer was added as a high-strength and high-viscosity modifier when preparing high-performance modified asphalt materials. The roll material has good cohesive strength and heat resistance. The peel strength between roll materials is above 2.40 N / mm, and the heat resistance can pass 105℃. At the same time, since the ethylene-acrylate copolymer resin contains polar segments, it can also effectively improve the adhesion performance between the roll material and the base layer.

[0099] Compared to Example 1, Comparative Example 4 did not add ethylene-acrylate copolymer as a high-strength, high-viscosity modifier during the preparation of the modified asphalt layer. The peel strength between the rolls decreased to 1.75 N / mm, and the heat resistance also failed the 105°C test, indicating a significant decrease in the cohesive strength of the modified asphalt. Furthermore, the peel strength between the roll and the aluminum sheet also decreased to 1.96 N / mm, indicating a significant decrease in the adhesion between the modified asphalt and the base layer.

[0100] The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it accordingly. They should not be construed as limiting the scope of protection of the present invention. All equivalent changes or modifications made in accordance with the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

[0101] 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.

Claims

1. A polyolefin composite modified bitumen waterproof membrane, characterized in that: It comprises, from top to bottom, a reflective polyolefin elastomer layer, a barrier adhesive layer, a modified bitumen layer, and an anti-sticking layer. The raw materials for the reflective polyolefin elastomer layer include thermoplastic polyolefin elastomer, polymer compatibilizer, reflective filler, thermal radiation filler, and optional thermoplastic resin. The raw material formulation of the reflective polyolefin elastomer layer, by weight, includes: 20-80 parts of thermoplastic polyolefin elastomer; 0-40 parts of thermoplastic resin; 1-7 parts of polymeric compatibilizer; 4-20 parts of reflective filler; 1-10 parts of thermal radiation filler; The reflective filler includes visible light reflective filler and near-infrared light reflective filler, and the mass ratio of the visible light reflective filler to the near-infrared light reflective filler is 1:0.2 to 5; The visible light reflective filler is rutile nano-titanium dioxide with a medium particle size D. 50 200-350nm; The near-infrared light reflective filler is rutile nano-titanium dioxide with a medium particle size D. 50 The range is 500-1100nm; The thermal radiation filler is at least one of ZrO2, Fe2O3, SiO2, MnO2, NiO, Co2O3 and CuO, and its particle size is 5 to 40 μm; The polymer compatibilizer is one or a combination of maleic anhydride-grafted polypropylene and methyl methacrylate-grafted polypropylene. The modified asphalt layer contains a high-strength, high-viscosity modifier, which is an ethylene-acrylate copolymer; the ethylene-acrylate copolymer is at least one of ethylene-methacrylate copolymer, ethylene-ethyl acrylate copolymer, and ethylene-butyl acrylate copolymer.

2. The polyolefin composite modified bitumen waterproof membrane according to claim 1, characterized in that: The thermoplastic resin is polypropylene.

3. The polyolefin composite modified bitumen waterproof membrane according to claim 2, characterized in that: The raw material formulation of the reflective polyolefin elastomer layer also includes additives, which include one or more of light stabilizers and antioxidants, and the amount of the additives is 0.3 to 2 parts.

4. The polyolefin composite modified bitumen waterproof membrane according to claim 1, characterized in that: The raw material of the modified asphalt layer contains asphalt, and the mass ratio of the asphalt to the high-strength, high-viscosity modifier is 1:0.03 to 0.

2.

5. The polyolefin composite modified bitumen waterproof membrane according to claim 1, characterized in that: The modified asphalt layer includes a first modified asphalt rubber layer, a polyester base layer, and a second modified asphalt rubber layer stacked sequentially. The high-strength and high-viscosity modifier is added to the first modified asphalt rubber layer and the second modified asphalt rubber layer, respectively. The first modified asphalt rubber layer is disposed between the barrier adhesive layer and the polyester base layer, and the anti-adhesion layer is disposed on the second modified asphalt rubber layer.

6. The polyolefin composite modified bitumen waterproof membrane according to claim 5, characterized in that: By weight, the raw materials for the first modified asphalt rubber layer and the second modified asphalt rubber layer each independently include: 30-50 parts of petroleum asphalt, 8-15 parts of plasticizer, 5-15 parts of rubber modifier, 2-5 parts of high-strength and high-viscosity modifier, 2-5 parts of tackifying resin, 5-10 parts of tire rubber powder, and 15-40 parts of filler.

7. The polyolefin composite modified bitumen waterproof membrane according to claim 6, characterized in that: The petroleum asphalt is at least one of 70# and 90# petroleum asphalt.

8. The polyolefin composite modified bitumen waterproof membrane according to claim 6, characterized in that: The plasticizer is at least one of paraffin oil or naphthenic oil.

9. The polyolefin composite modified bitumen waterproof membrane according to claim 6, characterized in that: In the first modified asphalt rubber layer and the second modified asphalt rubber layer, the rubber modifier is at least one of SBS, SEBS, and SBR.

10. The polyolefin composite modified bitumen waterproof membrane according to claim 6, characterized in that: The tackifying resin is at least one of C5 petroleum resin, C9 petroleum resin, C5 / C9 copolymer petroleum resin, rosin resin, and hydrogenated rosin resin.

11. The polyolefin composite modified bitumen waterproof membrane according to claim 6, characterized in that: In the first modified asphalt binder layer and the second modified asphalt binder layer, the filler is at least one of talc, heavy calcium carbonate, light calcium carbonate, montmorillonite, and kaolin.

12. The polyolefin composite modified bitumen waterproof membrane according to claim 6, characterized in that: The thicknesses of the first modified asphalt binder layer and the second modified asphalt binder layer are 1.0 to 1.5 mm, respectively.

13. The polyolefin composite modified bitumen waterproof membrane according to claim 1, characterized in that: The thickness of the reflective polyolefin elastomer layer is 0.05–0.4 mm; and / or, The barrier adhesive layer is a polyamide layer.

14. The polyolefin composite modified bitumen waterproof membrane according to claim 1, characterized in that: The thickness of the barrier adhesive layer is 0.02–0.12 mm; and / or, The anti-stick layer is a PE film or a release film.

15. The polyolefin composite modified bitumen waterproof membrane according to claim 1, characterized in that: The thickness of the polyolefin composite modified bitumen waterproof membrane is 3.0 to 4.5 mm.

16. A method for preparing a polyolefin composite modified bitumen waterproof membrane according to any one of claims 1 to 15, characterized in that, The preparation method includes the following steps: (1) Preparation of reflective polyolefin elastomer layer The resin material is added to an extruder, mixed, extruded, and granulated to obtain a resin mixture, wherein the resin material includes a thermoplastic polyolefin elastomer and a polymer compatibilizer; The powders are mixed to obtain a powder mixture, wherein the powders include reflective fillers and thermal radiation fillers; The resin mixture and powder mixture are added to an extruder, extruded, calendered, and cooled to produce polyolefin elastomer sheets; (2) Preparation of waterproof membrane On a modified bitumen roll production line, modified bitumen adhesive is coated on the upper and lower surfaces of the base material, and then the polyolefin elastomer sheet is laminated on the upper surface and an anti-sticking layer is laminated on the lower surface to obtain the polyolefin composite modified bitumen waterproof roll.

17. The application of the polyolefin composite modified bitumen waterproof membrane according to any one of claims 1 to 15 in the field of waterproofing of buildings or structures, wherein the polyolefin composite modified bitumen waterproof membrane is used for exposed waterproofing.

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