SBS waterproof roll mask and preparation method thereof

Abstract

The invention relates to an SBS waterproof coiled material mask and a preparation method thereof.The SBS waterproof coiled material mask comprises a surface layer, a middle layer, a bottom layer and an oil-resistant coating, the surface layer and the bottom layer comprise homo-polypropylene, block anti-impact co-polypropylene, a polyolefin elastomer and a double-resistant agent, the middle layer comprises homo-polypropylene, block anti-impact co-polypropylene, talcum powder filling master batch and a double-resistant agent, and the oil-resistant coating is arranged between the surface layer and the bottom layer. The oil-resistant coating comprises acrylate resin and an isocyanate curing agent, the middle layer is arranged between the surface layer and the bottom layer, and the oil-resistant coating is arranged on the side, away from the middle layer, of the surface layer and / or the bottom layer. The SBS waterproof roll mask has the advantages that the SBS waterproof roll mask is low in melting enthalpy, easy to bake, not prone to shrinkage and good in aging resistance; the SBS waterproof roll mask is provided with the oil-resistant coating, has a good bonding effect, does not need an additional bonding coating, and has oil-resistant performance.

Description

Technical Field

[0001] This invention relates to the field of waterproof membrane technology, and more particularly to an SBS waterproof membrane and its preparation method. Background Technology

[0002] In the field of building waterproofing engineering, SBS modified bitumen waterproof membranes, with their excellent high-temperature resistance, elastic recovery, and crack resistance, have become the core material for waterproofing critical areas such as roofs, underground projects, and kitchens and bathrooms. The fire-heat fusion application process, as the mainstream method for laying this type of membrane, is widely used in various building waterproofing projects due to its advantages such as simple operation, strong adaptability to different climates and substrate conditions, controllable construction costs, and outstanding cost-effectiveness. It plays a vital role in protecting building structures from water erosion and extending the service life of buildings.

[0003] Currently, most SBS modified bitumen waterproof membranes on the market are equipped with a polyethylene (PE) protective film. This type of protective film is mainly used during the production, transportation, and storage of the membrane to prevent surface damage and interlayer adhesion, while also providing temporary protection in the early stages of construction. However, in actual hot-melt construction and long-term service, existing PE protective films have revealed many insurmountable technical problems, severely restricting the construction quality and service stability of waterproofing projects.

[0004] On the one hand, during the hot-melt construction stage (typically at 180-220℃), PE material itself has limited thermal stability and is prone to irregular shrinkage and melting agglomeration under high-temperature baking. These agglomerations form localized protrusions or wrinkles, preventing the asphalt layer after the membrane melts from achieving uniform adhesion to the substrate, resulting in gaps and hollow layers at the interface. These hollow layers not only significantly weaken the interfacial bonding strength between the membrane and the substrate, compromising the integrity of the waterproofing system, but also become hidden channels for rainwater and groundwater infiltration, easily causing water seepage problems. Water will spread along the hollow layers under the membrane, expanding the area of ​​waterproofing failure, making subsequent repairs difficult and costly, and in severe cases, even corroding the main building structure, posing safety hazards.

[0005] On the other hand, the performance defects of ordinary PE protective films become increasingly apparent during long-term service. Firstly, their oil-blocking properties are poor, failing to effectively prevent the migration of light oils, plasticizers, and other oily substances from the asphalt components within the SBS membrane to the surface. These migrating oily components easily form an oil film at the bonding interface between the membrane and the substrate, damaging the physical and chemical adhesion between the asphalt layer and the substrate, leading to interface peeling and weakened adhesion. Secondly, their anti-aging performance is insufficient. Under the long-term catalytic effects of outdoor sunlight (especially ultraviolet radiation), diurnal temperature cycles, and alternating periods of heat and humidity, PE protective films are prone to photo-oxidative aging and thermo-oxidative aging, manifesting as surface cracking, embrittlement, and weathering damage, rapidly losing their protective function for the membrane surface. The failure of the protective film exposes the membrane directly to harsh environments, accelerating the aging and powdering of the asphalt layer, thereby shortening the service life of the entire waterproof membrane system and increasing the frequency and overall cost of waterproofing project renovations.

[0006] In response to the aforementioned technical bottlenecks of existing PE protective films in the application of SBS modified bitumen waterproof membranes during fire-baking construction and long-term service, there is an urgent need to develop a special high-performance protective film to solve core problems such as poor waterproof adhesion, high risk of water seepage, migration of oily components, and weak anti-aging ability.

[0007] Currently, no effective solutions have been proposed for the problems existing in the relevant technologies, such as easy shrinkage, easy aging, and poor adhesion when heated. Summary of the Invention

[0008] The purpose of this invention is to address the shortcomings of existing technologies by providing an SBS waterproof membrane roll and its preparation method, thereby solving problems such as easy shrinkage during baking, easy aging, and poor adhesion in related technologies.

[0009] To achieve the above objectives, the technical solution adopted by the present invention is as follows: In a first aspect, an SBS waterproof roll membrane is provided, comprising: The surface layer comprises homopolymer polypropylene, block impact copolymer polypropylene, polyolefin elastomer, and dual-resistance agent; The middle layer comprises homopolymer polypropylene, block impact copolymer polypropylene, talc filler masterbatch, and dual-resistance agent; The bottom layer comprises homopolymer polypropylene, block impact copolymer polypropylene, polyolefin elastomer, and dual-resistance agent; An oil-resistant coating, wherein the oil-resistant coating comprises an acrylate resin and an isocyanate curing agent; The intermediate layer is disposed between the top layer and the bottom layer, and the oil-resistant coating is disposed on the side of the top layer and / or the bottom layer away from the intermediate layer.

[0010] In some of these embodiments, the homopolymer polypropylene is treated with di-tert-butyl oxide.

[0011] In some of these embodiments, the weight ratio of di-tert-butyl peroxide to homopolymer polypropylene is 0.6% to 1%.

[0012] In some of these embodiments, the block impact copolymer polypropylene is treated with di-tert-butyl oxide.

[0013] In some of these embodiments, the weight ratio of di-tert-butyl peroxide to block impact copolymer polypropylene is 0.6% to 1%.

[0014] In some of these embodiments, the polyolefin elastomer is a metallocene-catalyzed ethylene-octene copolymer polyolefin elastomer.

[0015] In some embodiments, the top layer and the bottom layer, by weight percentage, comprise: Homopolymer polypropylene 40%–60%; Block impact copolymer polypropylene 30%–50%; Polyolefin elastomers 5%–8%; Dual-resistance agents: 3%–6%.

[0016] In some embodiments, the middle layer comprises, by weight percentage: Homopolymer polypropylene 40%–50%; Block impact copolymer polypropylene 30%–40%; Talc filler masterbatch 10%–20%; Dual-resistance agents: 3%–6%.

[0017] In some embodiments, the weight ratio of isocyanate curing agent to acrylate resin in the oil-resistant coating is 1 to 3:100.

[0018] In some embodiments, the thickness of the SBS waterproof membrane is 0.007 mm to 0.015 mm.

[0019] In a second aspect, a method for preparing an SBS waterproof membrane is provided, for preparing the SBS waterproof membrane as described in the first aspect, comprising: Raw material mixing: The raw materials for the top layer, middle layer, and bottom layer are thoroughly mixed separately to obtain the top layer mixture, middle layer mixture, and bottom layer mixture, respectively. Melt extrusion: The top layer mixture, middle layer mixture, and bottom layer mixture are melt extruded separately to obtain top layer melt, middle layer melt, and bottom layer melt, respectively; Casting: The top layer molten material, the middle layer molten material, and the bottom layer molten material are cast to obtain an SBS waterproof membrane. Coating: Applying an oil-resistant coating to the top layer and / or the underlayer to form an oil-resistant coating.

[0020] In some of these embodiments, the pretreatment method for homopolymer polypropylene includes: Drying: The homopolymer polypropylene is dried to ensure a moisture content of ≤0.05%; Premixing: Homopolymer polypropylene and di-tert-butyl peroxide are mixed at a preset ratio, a preset temperature, and a preset time to obtain pretreated homopolymer polypropylene.

[0021] In some of these embodiments, the pretreatment method for block impact copolymer polypropylene includes: Drying: The block impact copolymer polypropylene is dried to a moisture content ≤0.05%; Mixing: Block impact copolymer polypropylene and di-tert-butyl peroxide are mixed at a preset ratio, preset temperature, preset time, and preset stirring speed to obtain pretreated block impact copolymer polypropylene.

[0022] In some of these embodiments, the premix includes: Preheating: Homopolymer polypropylene and di-tert-butyl peroxide are heated at a first preset temperature, a first preset time, and a first stirring speed; Dispersion: Homopolymer polypropylene and di-tert-butyl peroxide are stirred at a second preset temperature, a second preset time, and a second stirring speed; Cooling: The homopolymer polypropylene and di-tert-butyl peroxide are cooled at a second preset temperature, a second preset time, and a second stirring speed.

[0023] In some of these embodiments, during melt extrusion: the extrusion temperature of the top layer is 180°C to 225°C, the rotation speed is 30 rpm to 40 rpm, and the melt pressure is 10 MPa to 20 MPa; the extrusion temperature of the middle layer is 180°C to 230°C, the rotation speed is 40 rpm to 50 rpm, and the melt pressure is 10 MPa to 20 MPa; and the extrusion temperature of the bottom layer is 180°C to 220°C, the rotation speed is 30 rpm to 40 rpm, and the melt pressure is 10 MPa to 20 MPa.

[0024] In some of these embodiments, during the casting process: the cooling temperature is 25°C to 35°C, and the traction speed is 30 m / min to 60 m / min.

[0025] In some of these embodiments, during coating: the coating temperature is 40°C to 80°C, the speed is 40 m / min to 70 m / min, and the wet coating amount is 2% to 5%.

[0026] The present invention adopts the above technical solution and has the following technical effects compared with the prior art: This invention discloses an SBS waterproof membrane and its preparation method. Existing HDPE waterproof membranes tend to shrink and are difficult to melt during the heat treatment process. Furthermore, HDPE waterproof membranes are prone to water seepage when bonded to the base film due to poor adhesion. The SBS waterproof membrane of this invention has a low melting enthalpy, melts easily during heat treatment, does not shrink easily, and exhibits good aging resistance. The SBS waterproof membrane of this invention also has an oil-resistant coating, provides good adhesion, eliminates the need for an additional adhesive coating, and possesses oil-blocking properties. Detailed Implementation

[0027] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0028] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0029] The present invention will be further described below with reference to specific embodiments, but these are not intended to limit the scope of the invention.

[0030] Example 1 This embodiment relates to the SBS waterproof roll membrane and its preparation method of the present invention.

[0031] An illustrative embodiment of the present invention provides an SBS waterproof membrane roll, comprising a top layer, a middle layer, a bottom layer, and an oil-resistant coating. The middle layer is disposed on one side of the top layer; the bottom layer is disposed on the side of the middle layer away from the top layer, i.e., the middle layer is disposed between the top layer and the bottom layer; the oil-resistant coating is disposed on the side of the top layer away from the middle layer and / or the side of the bottom layer away from the middle layer.

[0032] The SBS waterproof membrane of the present invention includes the following forms: 1) Oil-resistant coating – topcoat – intermediate coat – base coat; 2) Topcoat – Intermediate Coat – Base Coat – Anti-oil Coating; 3) Oil-resistant coating - top layer - middle layer - bottom layer - oil-resistant coating.

[0033] The thickness of the SBS waterproof membrane of the present invention is 0.007 mm to 0.015 mm.

[0034] It should be noted that in this invention, the components of the bottom layer and the top layer are the same.

[0035] In this invention, the top layer and the bottom layer, by weight percentage, comprise: 40%–60% homopolymer polypropylene, 30%–50% block impact copolymer polypropylene, 5%–8% polyolefin elastomer, and 3%–6% dual-resistance agent.

[0036] In this invention, the middle layer comprises, by weight percentage: 40%–50% homopolymer polypropylene, 30%–40% block impact copolymer polypropylene, 10%–20% talc filler masterbatch, and 3%–6% dual-impact agent.

[0037] It should be noted that in this invention, both homopolymer polypropylene and block impact copolymer polypropylene are treated with di-tert-butyl peroxide. The purpose of this treatment is to reduce the molecular weight of the homopolymer polypropylene and block impact copolymer polypropylene, thereby reducing the enthalpy of melting and making them easier to melt during the heat treatment process, thus improving the adhesion between the SBS waterproof membrane and the base film.

[0038] In this invention, the weight ratio of di-tert-butyl peroxide to homopolymer polypropylene is 0.6% to 1%.

[0039] In this invention, the weight ratio of di-tert-butyl peroxide to block impact copolymer polypropylene is 0.6% to 1%.

[0040] In this invention, the weight ratio of isocyanate curing agent to acrylic resin in the oil-resistant coating is 1~3:100. That is, the amount of isocyanate curing agent used is 1%~3% of the acrylic resin.

[0041] The preparation method for the SBS waterproof membrane as described above is as follows: (a) Raw material mixing: The raw materials for the top layer, the middle layer, and the bottom layer are thoroughly mixed to obtain the top layer mixture, the middle layer mixture, and the bottom layer mixture, respectively; (ii) Melt extrusion: The surface layer mixture, the middle layer mixture, and the bottom layer mixture are melt extruded separately to obtain surface melt material, middle melt material, and bottom melt material, respectively; (iii) Casting: The top layer molten material, the middle layer molten material, and the bottom layer molten material are cast to obtain SBS waterproof membrane. (iv) Coating: Apply the oil-resistant coating to the top layer and / or the bottom layer to form an oil-resistant coating.

[0042] In (a) raw material mixing, the raw materials of each layer are put into the corresponding mixing equipment according to the component ratio for mixing.

[0043] Generally, mixing equipment includes, but is not limited to, high-speed mixers.

[0044] In (ii) melt extrusion, the extrusion temperature of the top layer and bottom layer is 180℃~225℃, the rotation speed is 30rpm~40rpm, and the melt pressure is 10MPa~20MPa; the extrusion temperature of the middle layer is 180℃~230℃, the rotation speed is 40rpm~50rpm, and the melt pressure is 10MPa~20MPa.

[0045] More specifically, the extrusion temperatures for the top and bottom layers are 180℃→200℃→210℃→220℃.

[0046] More specifically, the extrusion temperature of the middle layer is 180℃→200℃→215℃→230℃.

[0047] In (iii) casting, the cooling temperature is 25℃~35℃ and the traction speed is 30m / min~60m / min.

[0048] In (iv) coating, the coating temperature is 40℃~80℃, the speed is 40m / min~70m / min, and the wet coating amount is 2%~5%.

[0049] More specifically, the coating temperature is 40~50℃→60~65℃→70~80℃→70~80℃→70~80℃→60~65℃→40~50℃.

[0050] It should be noted that the solvent for the anti-oil coating is ethyl acetate, and the weight ratio of ethyl acetate to acrylate resin is 1~2:1. That is, the amount of ethyl acetate used is 100%~200% of the amount of acrylate resin. After coating is completed, the ethyl acetate evaporates, and the anti-oil coating is a mixture of acrylate resin and isocyanate curing agent.

[0051] It should be noted that, prior to raw material mixing (I), the homopolymer polypropylene and block impact copolymer polypropylene undergo further treatment. The treatment methods are as follows: Drying: The homopolymer polypropylene / block impact copolymer polypropylene is dried to a moisture content ≤0.05%; Premix: Homopolymer polypropylene / block impact copolymer polypropylene and di-tert-butyl peroxide are mixed at a preset ratio, a preset temperature, and a preset time to obtain pretreated homopolymer polypropylene / block impact copolymer polypropylene.

[0052] Furthermore, the premix includes: Preheating: The homopolymer polypropylene / block impact copolymer polypropylene and di-tert-butyl peroxide are heated at a first preset temperature, a first preset time, and a first stirring speed; Dispersion: Homopolymer polypropylene / block impact copolymer polypropylene and di-tert-butyl peroxide are stirred at a second preset temperature, a second preset time and a second stirring speed; Cooling: The homopolymer polypropylene / block impact copolymer polypropylene and di-tert-butyl peroxide are cooled at a second preset temperature, a second preset time, and a second stirring speed.

[0053] During preheating, the first preset temperature is 40℃~50℃, the first preset time is 2min~3min, and the first stirring speed is 300rpm~500rpm.

[0054] It should be noted that the purpose of preheating is to enhance the surface activity of homopolymer polypropylene / block impact copolymer polypropylene, which facilitates subsequent peroxide adsorption.

[0055] In the dispersion process, the second preset temperature is 60℃~70℃, the second preset time is 5min~8min, and the second stirring speed is 800rpm~1200rpm.

[0056] It should be noted that using a temperature lower than that of peroxide decomposition during dispersion can prevent peroxide decomposition, and high-speed stirring (shearing) can ensure that the peroxide liquid is uniformly coated on the surface of homopolymer polypropylene / block impact copolymer polypropylene.

[0057] During cooling, the third preset temperature is <40℃, the third preset time is 3min to 5min, and the third stirring speed is 300rpm to 500rpm.

[0058] It should be noted that during cooling, lowering the temperature to below 40°C can prevent residual heat from causing premature decomposition of peroxides.

[0059] The technical effects of this invention are as follows: 1) Existing HDPE waterproof membranes tend to shrink and are difficult to melt during the heat treatment process. When the HDPE waterproof membrane is attached to the base film, water may seep through due to poor adhesion. The SBS waterproof membrane of this invention has a low melting enthalpy, is easy to melt, does not shrink easily, and has good aging resistance. 2) The SBS waterproof membrane of the present invention has an oil-resistant coating, has a good adhesion effect, does not require an additional adhesive coating, and has oil-blocking properties.

[0060] Example 2 This embodiment is a specific implementation of the present invention.

[0061] In this embodiment, the components of each layer of the SBS waterproof membrane are as follows: Top layer: 60% homopolymer polypropylene, 32% block impact copolymer polypropylene, 5% polyolefin elastomer, 3% dual-resistance agent; Middle layer: 50% homopolymer polypropylene, 37% block impact copolymer polypropylene, 10% talc filler masterbatch, 3% dual-resistance agent; Bottom layer: 60% homopolymer polypropylene, 32% block impact copolymer polypropylene, 5% polyolefin elastomer, 3% dual-resistance agent; Oil-resistant coating: 100% acrylic resin, 1.5% isocyanate curing agent, 200% ethyl acetate.

[0062] For homopolymer polypropylene and block impact copolymer polypropylene, the treatment methods include: Drying: Homopolymer polypropylene / block impact copolymer polypropylene was vacuum dried at 90°C for 5 hours to ensure a moisture content of ≤0.05%; Preheating: Homopolymer polypropylene / block impact copolymer polypropylene and di-tert-butyl peroxide were heated at 40℃ for 2 min and 300 rpm, wherein the amount of di-tert-butyl peroxide added was 0.6%; Dispersion: Homopolymer polypropylene and di-tert-butyl peroxide were stirred at 60℃ for 5 min and 800 rpm; Cooling: Homopolymer polypropylene and di-tert-butyl peroxide were cooled at <40℃ for 3 min and 300 rpm.

[0063] The extrusion casting process parameters are shown in the table below.

[0064] The coating process parameters of the coating machine are shown in the table below.

[0065] Example 3 This embodiment is a specific implementation of the present invention.

[0066] In this embodiment, the components of each layer of the SBS waterproof membrane are as follows: Top layer: 50% homopolymer polypropylene, 42% block impact copolymer polypropylene, 5% polyolefin elastomer, 3% dual-resistance agent; Middle layer: 40% homopolymer polypropylene, 47% block impact copolymer polypropylene, 10% talc filler masterbatch, 3% dual-resistance agent; Bottom layer: 50% homopolymer polypropylene, 42% block impact copolymer polypropylene, 5% polyolefin elastomer, 3% dual-resistance agent; Oil-resistant coating: 100% acrylic resin, 2% isocyanate curing agent, 200% ethyl acetate.

[0067] For homopolymer polypropylene and block impact copolymer polypropylene, the treatment methods include: Drying: Homopolymer polypropylene / block impact copolymer polypropylene was vacuum dried at 90°C for 5 hours to ensure a moisture content of ≤0.05%; Preheating: Homopolymer polypropylene / block impact copolymer polypropylene and di-tert-butyl peroxide were heated at 40℃ for 2 min and 300 rpm, wherein the amount of di-tert-butyl peroxide added was 0.6%; Dispersion: Homopolymer polypropylene and di-tert-butyl peroxide were stirred at 60℃ for 5 min and 800 rpm; Cooling: Homopolymer polypropylene and di-tert-butyl peroxide were cooled at <40℃ for 3 min and 300 rpm.

[0068] The extrusion casting process parameters are shown in the table below.

[0069] The coating process parameters of the coating machine are shown in the table below.

[0070] Example 4 This embodiment is a specific implementation of the present invention.

[0071] In this embodiment, the components of each layer of the SBS waterproof membrane are as follows: Top layer: 50% homopolymer polypropylene, 39% block impact copolymer polypropylene, 5% polyolefin elastomer, 6% dual-resistance agent; Middle layer: 40% homopolymer polypropylene, 44% block impact copolymer polypropylene, 10% talc filler masterbatch, 6% dual-resistance agent; Bottom layer: 50% homopolymer polypropylene, 39% block impact copolymer polypropylene, 5% polyolefin elastomer, 6% dual-resistance agent; Oil-resistant coating: 100% acrylic resin, 2% isocyanate curing agent, 200% ethyl acetate.

[0072] For homopolymer polypropylene and block impact copolymer polypropylene, the treatment methods include: Drying: Homopolymer polypropylene / block impact copolymer polypropylene was vacuum dried at 90°C for 5 hours to ensure a moisture content of ≤0.05%; Preheating: Homopolymer polypropylene / block impact copolymer polypropylene and di-tert-butyl peroxide were heated at 40℃ for 2 min and 300 rpm, wherein the amount of di-tert-butyl peroxide added was 0.6%; Dispersion: Homopolymer polypropylene and di-tert-butyl peroxide were stirred at 60℃ for 5 min and 800 rpm; Cooling: Homopolymer polypropylene and di-tert-butyl peroxide were cooled at <40℃ for 3 min and 300 rpm.

[0073] The extrusion casting process parameters are shown in the table below.

[0074] The coating process parameters of the coating machine are shown in the table below.

[0075] Example 5 This embodiment is a specific implementation of the present invention.

[0076] In this embodiment, the components of each layer of the SBS waterproof membrane are as follows: Top layer: 40% homopolymer polypropylene, 46% block impact copolymer polypropylene, 8% polyolefin elastomer, 6% dual-resistance agent; Middle layer: 40% homopolymer polypropylene, 39% block impact copolymer polypropylene, 15% talc filler masterbatch, 6% dual-resistance agent; Bottom layer: 40% homopolymer polypropylene, 46% block impact copolymer polypropylene, 8% polyolefin elastomer, 6% dual-resistance agent; Oil-resistant coating: 100% acrylic resin, 1.5% isocyanate curing agent, 150% ethyl acetate.

[0077] For homopolymer polypropylene and block impact copolymer polypropylene, the treatment methods include: Drying: Homopolymer polypropylene / block impact copolymer polypropylene was vacuum dried at 90°C for 5 hours to ensure a moisture content of ≤0.05%; Preheating: Homopolymer polypropylene / block impact copolymer polypropylene and di-tert-butyl peroxide were heated at 40℃ for 2 min and 300 rpm, wherein the amount of di-tert-butyl peroxide added was 0.6%; Dispersion: Homopolymer polypropylene and di-tert-butyl peroxide were stirred at 60℃ for 5 min and 800 rpm; Cooling: Homopolymer polypropylene and di-tert-butyl peroxide were cooled at <40℃ for 3 min and 300 rpm.

[0078] The extrusion casting process parameters are shown in the table below.

[0079] The coating process parameters of the coating machine are shown in the table below.

[0080] Example 6 This embodiment is a specific implementation of the present invention.

[0081] In this embodiment, the components of each layer of the SBS waterproof membrane are as follows: Top layer: 55% homopolymer polypropylene, 35% block impact copolymer polypropylene, 6% polyolefin elastomer, 4% dual-resistance agent; Middle layer: 50% homopolymer polypropylene, 34% block impact copolymer polypropylene, 12% talc filler masterbatch, 4% dual-resistance agent; Bottom layer: 55% homopolymer polypropylene, 35% block impact copolymer polypropylene, 6% polyolefin elastomer, 4% dual-resistance agent; Oil-resistant coating: 100% acrylic resin, 1.5% isocyanate curing agent, 200% ethyl acetate.

[0082] For homopolymer polypropylene and block impact copolymer polypropylene, the treatment methods include: Drying: Homopolymer polypropylene / block impact copolymer polypropylene was vacuum dried at 90°C for 5 hours to ensure a moisture content of ≤0.05%; Preheating: Homopolymer polypropylene / block impact copolymer polypropylene and di-tert-butyl peroxide were heated at 40℃ for 2 min and 300 rpm, wherein the amount of di-tert-butyl peroxide added was 0.6%; Dispersion: Homopolymer polypropylene and di-tert-butyl peroxide were stirred at 60℃ for 5 min and 800 rpm; Cooling: Homopolymer polypropylene and di-tert-butyl peroxide were cooled at <40℃ for 3 min and 300 rpm.

[0083] The extrusion casting process parameters are shown in the table below.

[0084] The coating process parameters of the coating machine are shown in the table below.

[0085] Example 7 This embodiment relates to the testing of Embodiments 2 through 6. The test results are shown in the table below.

[0086] Among them, the tensile strength retention rate, elongation at break retention rate, and chalking grade were all tested after UV aging for 1000 hours (GB / T 16422.3-2022).

[0087] Comparative Example 1 This comparative example uses HDPE raw materials to produce a three-layer blown film, forming a roll. The film in this comparative example has poor thickness uniformity, is prone to weathering when exposed to sunlight, and the HDPE film tends to shrink and clump together when heated. The roll is not firmly bonded to the substrate and is prone to water seepage.

[0088] Comparative Example 2 Compared to this invention, the comparative example does not contain an anti-oil coating. After being exposed to sunlight, the roll material completely powdered within 7 days. The main reason is that the oil components of the roll material and sunlight synergistically accelerate the aging of the roll material.

[0089] Comparative Example 3 Compared to this invention, the comparative example did not treat the homopolymer polypropylene and block impact copolymer polypropylene with di-tert-butyl peroxide. During heat treatment, the comparative example showed low oil exudation from the roll material and poor adhesion between the roll material and the substrate.

[0090] The above description is merely a preferred embodiment of the present invention and does not limit the implementation and protection scope of the present invention. Those skilled in the art should realize that any equivalent substitutions and obvious changes made using the present invention specification should be included within the protection scope of the present invention.

Claims

1. An SBS waterproofing membrane veil, characterized in that, Comprise: a surface layer comprising homopolymer polypropylene, block impact copolymer polypropylene, polyolefin elastomer, bis-antioxidant; a middle layer comprising homopolymer polypropylene, block impact copolymer polypropylene, talcum powder filled masterbatch, bis-antioxidant; a bottom layer comprising homopolymer polypropylene, block impact copolymer polypropylene, polyolefin elastomer, bis-antioxidant; an oil-resistant coating layer comprising acrylate resin, isocyanate curing agent; wherein the middle layer is arranged between the surface layer and the bottom layer, and the oil-resistant coating layer is arranged on the side of the surface layer and / or the bottom layer away from the middle layer.

2. The SBS waterproofing membrane face film of claim 1, wherein, The homopolymer polypropylene is treated with di-tert-butyl peroxide; and / or The block impact copolymer polypropylene is treated with di-tert-butyl peroxide.

3. The SBS waterproofing membrane face membrane of claim 2, wherein, The weight ratio of di-tert-butyl peroxide to homopolymer polypropylene is 0.6% to 1%; and / or The weight ratio of di-tert-butyl peroxide to block impact copolymer polypropylene is 0.6% to 1%.

4. The SBS waterproofing membrane face film of claim 1, wherein, The polyolefin elastomer is a metallocene-catalyzed ethylene-octene copolymer polyolefin elastomer.

5. The SBS waterproofing membrane face film of claim 1, wherein, In the surface layer and the bottom layer, by weight percentage, comprising: homopolymer polypropylene 40% to 60%; block impact copolymer polypropylene 30% to 50%; polyolefin elastomer 5% to 8%; bis-antioxidant 3% to 6%; and / or In the middle layer, by weight percentage, comprising: homopolymer polypropylene 40% to 50%; block impact copolymer polypropylene 30% to 40%; talcum powder filled masterbatch 10% to 20%; bis-antioxidant 3% to 6%; and / or In the oil-resistant coating layer, the weight ratio of isocyanate curing agent to acrylate resin is 1 to 3:

100.

6. The SBS waterproofing membrane face membrane according to any one of claims 1 to 5, characterized in that, The thickness of the SBS waterproofing membrane surface film is 0.007mm to 0.015mm.

7. A method for preparing a SBS waterproofing membrane face sheet, for preparing a SBS waterproofing membrane face sheet as claimed in any one of claims 1 to 6, characterized in that, Comprise: raw material mixing: the raw materials of the surface layer, the raw materials of the middle layer, and the raw materials of the bottom layer are mixed respectively to obtain the surface layer mixture, the middle layer mixture, and the bottom layer mixture respectively; melt extrusion: the surface layer mixture, the middle layer mixture, and the bottom layer mixture are melt extruded respectively to obtain the surface layer melt, the middle layer melt, and the bottom layer melt respectively; flow forming: the surface layer melt, the middle layer melt, and the bottom layer melt are flow formed to obtain the SBS waterproofing membrane surface film; coating: the oil-resistant coating is coated on the surface layer and / or the bottom layer to form the oil-resistant coating layer.

8. The preparation method according to claim 7, characterized in that, The pretreatment method of homopolymer polypropylene comprises: drying: the homopolymer polypropylene is dried to have a water content of ≤0.05%; premixing: the homopolymer polypropylene and di-tert-butyl peroxide are mixed at a preset ratio at a preset temperature and for a preset time to obtain pretreated homopolymer polypropylene; and / or The pretreatment method of block impact copolymer polypropylene comprises: drying: the block impact copolymer polypropylene is dried to have a water content of ≤0.05%; mixing: the block impact copolymer polypropylene and di-tert-butyl peroxide are mixed at a preset ratio at a preset temperature, for a preset time, and at a preset stirring speed to obtain pretreated block impact copolymer polypropylene.

9. The production method according to claim 8, characterized by, In the premixing, comprising: preheating: the homopolymer polypropylene and di-tert-butyl peroxide are heated at a first preset temperature, for a first preset time, and at a first stirring speed; Dispersing: stirring homopolypropylene and di-tert-butyl peroxide at the second preset temperature, the second preset time and the second stirring speed; Cooling: cooling homopolypropylene and di-tert-butyl peroxide at the second preset temperature, the second preset time and the second stirring speed.

10. The method of any one of claims 7-9, wherein the method further comprises, In melt extrusion: the extrusion temperature of the surface layer is 180℃~225℃, the rotation speed is 30rpm~40rpm, and the melt pressure is 10MPa~20MPa; the extrusion temperature of the middle layer is 180℃~230℃, the rotation speed is 40rpm~50rpm, and the melt pressure is 10MPa~20MPa; the extrusion temperature of the bottom layer is 180~220℃, the rotation speed is 30rpm~40rpm, and the melt pressure is 10MPa~20MPa; and / or In cast molding: the cooling temperature is 25℃~35℃, and the pulling speed is 30m / min~60m / min; and / or In coating: the coating temperature is 40℃~80℃, the speed is 40m / min~70m / min, and the wet coating amount is 2%~5%. In melt extrusion: the extrusion temperature of the surface layer is 180℃~225℃, the rotation speed is 30rpm~40rpm, and the melt pressure is 10MPa~20MPa; the extrusion temperature of the middle layer is 180℃~230℃, the rotation speed is 40rpm~50rpm, and the melt pressure is 10MPa~20MPa; the extrusion temperature of the bottom layer is 180~220℃, the rotation speed is 30rpm~40rpm, and the melt pressure is 10MPa~20MPa; and / or In cast molding: the cooling temperature is 25℃~35℃, and the pulling speed is 30m / min~60m / min; and / or In coating: the coating temperature is 40℃~80℃, the speed is 40m / min~70m / min, and the wet coating amount is 2%~5%.

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