A new modified oxidized asphalt polyethylene tire waterproofing roll material

Abstract

The present application relates to waterproofing membrane technical field, specifically to a kind of novel modified oxidized bitumen polyethylene tire waterproofing membrane;Including the bitumen layer made of modified bitumen impregnation, also include at least two layers of composite polyethylene tire layer located in bitumen layer inside, any two adjacent composite polyethylene tire layer between layer is equipped with inner core layer;Equipped with composite polyethylene tire layer creatively introduces composite component including modified sepiolite, can synergistically improve the high temperature resistance of polyethylene material, modified sepiolite can obtain stronger interface bonding effect between polyethylene material between force;Creatively provided with inner core layer, the inner core layer has lower glass transition temperature than polyethylene, when polyethylene occurs molecular bond rupture and causes cracking under high temperature environment, inner core layer can be filled with gap in viscous flow state, realize certain degree self-repair function, avoid crack to cause waterproofing performance decline, inner core layer can cooperate with composite polyethylene tire layer to obtain more long-acting high temperature resistance waterproofing performance.

Description

Technical Field

[0001] This invention relates to the field of waterproof membrane technology, specifically to a novel modified oxidized asphalt polyethylene-based waterproof membrane. Background Technology

[0002] Modified oxidized asphalt is a binder made by adding rubber, resin, or other fillers and using oxidation processing measures to improve the performance of asphalt or mixtures. According to the standard GB 18967—2009, it is a waterproof membrane made of high-density polyethylene film as the base, modified asphalt on the upper and lower surfaces, and covered with a release material.

[0003] Modified bitumen polyethylene-based waterproof membranes are suitable for waterproofing projects in buildings and infrastructure. The performance of waterproof materials directly affects the service life of waterproofing. However, polyethylene membranes are prone to aging and cracking under high temperatures. Common polyethylene composite waterproof membranes are subject to these problems due to the influence of polyethylene. Currently, most commercially available polyethylene waterproof membranes have a high temperature resistance range of at most 60℃-90℃. Exceeding this temperature range can easily cause cracking and other damage to the waterproof membrane. This high temperature range is more easily exceeded in some production sites or outdoor areas exposed to direct sunlight. Once the waterproof membrane develops cracks and other structural problems, it will directly affect the waterproofing effect, resulting in a significant reduction in the service life of this type of waterproof membrane in such environments.

[0004] To address the issue of waterproof membranes' inability to withstand high temperatures, we propose a novel modified oxidized asphalt polyethylene-based waterproof membrane. This membrane is designed to be self-repairing in the event of thermal damage and cracking, thereby improving its effective application range and performance. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings mentioned in the background section and provide a novel modified oxidized asphalt polyethylene waterproof membrane.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0007] A novel modified oxidized bitumen polyethylene-based waterproof membrane includes a bitumen layer made of modified bitumen impregnated material, and the waterproof membrane also includes at least two composite polyethylene layers located inside the bitumen layer, with an inner core layer provided between any two adjacent composite polyethylene layers.

[0008] Preferably, the composite polyethylene tire layer uses polyethylene as the base material, and the percentage of each of the other components by mass of the polyethylene is as follows:

[0009]

[0010] Preferably, the composite polyethylene tire layer contains a composite high-temperature resistant filler comprising 0.15-0.6% of the polyethylene raw material by mass, wherein the composite high-temperature resistant filler is any one or more of nano-silica, alumina, and ceramic fiber.

[0011] Preferably, the composite high-temperature resistant filler specifically comprises nano-silica, alumina, and ceramic fibers in a mass ratio of 1-2:1:1.

[0012] Preferably, the specific preparation process steps of the modified sepiolite are as follows:

[0013] Step 1: Place the sepiolite raw material in a 0.3-0.5 mol / L NaOH solution and stir for 10-20 minutes;

[0014] Step 2: Add sepiolite to N,N-dimethylformamide solvent and stir at 1300-1500 r / min for 20-40 min until fully dispersed;

[0015] Step 3: Add epichlorohydrin to the mixture from Step 2, stir at 300-500 rpm for 1-1.5 hours at room temperature, then add polyethyleneimine and stir for 20-30 minutes.

[0016] Step 4: Centrifuge, wash, separate, dry, refine, and sieve the mixture.

[0017] Preferably, in step three above, 1 wt% of polyethyleneimine is used, and the mass ratio of polyethyleneimine to sepiolite raw material is 1:1.9-2.1.

[0018] Preferably, the particle size range of the modified sepiolite is controlled to be 25-38 μm.

[0019] Preferably, the inner core layer uses polymethyl methacrylate as the base material, and the specific mass percentage of each component is as follows:

[0020]

[0021] Preferably, the specific manufacturing process of the inner core layer is as follows:

[0022] Step 1: Weigh and mix all raw materials according to the proportions, then transfer them to an injection molding machine or hot press.

[0023] Step 2: Control the melt blending temperature to 120-150℃, process for 10-20 minutes, and apply a pressure of 10-20 MPa simultaneously;

[0024] Step 3: Extrusion leveling, followed by cooling and molding with air blowing or a cold water bath.

[0025] Preferably, a polyester fiberglass cloth layer is provided at least at one location between the composite polyethylene tire layer and the inner core layer, inside the composite polyethylene tire layer, or in the inner core layer.

[0026] Compared with the prior art, the beneficial effects of the present invention are:

[0027] This novel modified oxidized asphalt polyethylene-based waterproof membrane creatively incorporates composite components, including modified sepiolite, into its composite polyethylene layer. These components synergistically enhance the high-temperature resistance of the polyethylene material, and the modified sepiolite achieves stronger interfacial bonding with the polyethylene material. Furthermore, the membrane innovatively features an inner core layer with a lower glass transition temperature than polyethylene. When the polyethylene undergoes molecular bond breakage and cracking under high-temperature conditions, the inner core layer can fill the gaps in a viscous flow state, achieving a certain degree of self-repair function and preventing the waterproof performance from deteriorating due to cracks. The inner core layer, in conjunction with the composite polyethylene layer, provides a longer-lasting high-temperature waterproof performance. Detailed Implementation

[0028] 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 a part of the embodiments of the present invention, and not all of the embodiments. Unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] The present invention will describe the above technical solution in detail through the following embodiments:

[0030] Example 1

[0031] A novel modified oxidized asphalt polyethylene-based waterproof membrane is disclosed in this embodiment. It includes an asphalt layer made of SBS modified asphalt impregnated material, and two composite polyethylene layers located inside the asphalt layer. An inner core layer is provided between adjacent composite polyethylene layers. In this embodiment, the asphalt layer is controlled to be 1.8 mm thick, the composite polyethylene layer to be 4 mm thick, and the inner core layer to be 2 mm thick. A 0.35 mm thick polyester fiberglass cloth layer is provided between the composite polyethylene layers and the inner core layer.

[0032] In this embodiment, the composite polyethylene tire layer uses polyethylene as the base material. The specific percentage of other components by mass in the polyethylene is as follows:

[0033]

[0034]

[0035] It should be explained that: N,N-dimethylformamide in this component is modified by a surface modifier with hydroxide groups. Its polyethyleneimine can form a uniform coating layer on the surface of sepiolite, providing amine functional groups, which can obtain greater interfacial bonding force with polyethylene groups, improve internal structural force and reduce the probability of cracking.

[0036] In addition, triphenyl phosphate and 2,2'-methylenebis-(4-methyl-6-tert-butylphenol) can form chemical bonds with polyethylene after hot melt blending, thereby improving the thermal stability and high-temperature resistance of polyethylene. They can stabilize the polyethylene molecular chain, prevent chain destruction and thermal degradation, and thus improve the heat resistance of polyethylene. Zinc chloride has thermal stability and lubricity, and can delay the thermal decomposition and breakage of polyethylene. Hexaphenyldistannane is an organotin stabilizer that can inhibit the occurrence of thermal decomposition reaction and improve the heat resistance of polyethylene.

[0037] The composite polyethylene tire layer contains a composite high-temperature resistant filler comprising 0.5% of the polyethylene raw material by mass. The composite high-temperature resistant filler is any one or more of nano-silica, alumina, and ceramic fiber. In this embodiment, the composite high-temperature resistant filler specifically includes nano-silica, alumina, and ceramic fiber in a mass ratio of 2:1:1.

[0038] The main function of this type of filler is to improve its resistance to thermal expansion and mechanical strength. The surface of the filler can also interact with polyethylene to improve the material's thermal stability and high-temperature resistance. At the same time, nano-silica can form a uniformly dispersed three-dimensional network structure in polyethylene, which can increase the interfacial area and hinder chain movement, thereby improving the performance of polyethylene. It can absorb, disperse and insulate thermal energy, thus improving the high-temperature resistance and mechanical properties of polyethylene.

[0039] The specific preparation process steps for modified sepiolite are as follows:

[0040] Step 1: Place the sepiolite raw material in a 0.3 mol / L NaOH solution and stir for 20 min;

[0041] Step 2: Add sepiolite to N,N-dimethylformamide solvent and stir at 1500 r / min for 20 min until fully dispersed;

[0042] Step 3: Add epichlorohydrin to the mixture from Step 2, stir at 350 r / min for 1.5 h at room temperature, then add polyethyleneimine and stir for 30 min; use 1 wt% polyethyleneimine, and the mass ratio of polyethyleneimine to sepiolite raw material is 1:2.

[0043] Step 4: Centrifuge, wash, separate, dry, refine, and sieve the mixture to control the particle size of the modified sepiolite to be uniform at 28 μm.

[0044] It is worth noting that the inner core layer in this embodiment uses polymethyl methacrylate as the base material, and the specific mass percentage of each component is as follows:

[0045]

[0046] The specific fabrication process of the inner core layer is as follows:

[0047] Step 1: Weigh and mix all raw materials according to the proportions, then transfer them to an injection molding machine or hot press.

[0048] Step 2: Control the melt blending temperature to 135℃, process for 15 minutes, and apply a pressure of 20MPa simultaneously;

[0049] Step 3: Extrusion leveling, application of air cooling for molding.

[0050] Key points to explain: The inner core layer adjusts the glass transition temperature by controlling the content of butyl acetate and butyl butyrate. Nano-silicone improves material compatibility and fusion uniformity, primarily to enhance the interaction between polymethyl methacrylate and butyl acetate and butyl butyrate, thereby increasing fusion. Polyvinyl alcohol increases the material's viscosity, allowing the viscous flow state to adhere and fill gaps. Importantly, the transition from the glassy state to the viscous flow state is reversible, a reversible phase transition. It solidifies again when the temperature drops, making it particularly suitable for waterproofing and high-temperature resistance applications such as roofs.

[0051] Example 2

[0052] A novel modified oxidized asphalt polyethylene-based waterproof membrane is disclosed in this embodiment. It includes an asphalt layer made of SBS modified asphalt impregnated material, and two composite polyethylene layers located inside the asphalt layer. An inner core layer is provided between adjacent composite polyethylene layers. In this embodiment, the asphalt layer is controlled to be 1.8 mm thick, the composite polyethylene layer to be 4 mm thick, and the inner core layer to be 2 mm thick. A 0.35 mm thick polyester fiberglass cloth layer is provided between the composite polyethylene layers and the inner core layer.

[0053] The difference between this embodiment and Embodiment 1 is that: in this embodiment, the composite polyethylene tire layer also uses polyethylene as the base material, but the specific component types and their percentage by mass of polyethylene are as follows:

[0054]

[0055] In other words, no modified sepiolite is added in this embodiment, and all other conditions are the same.

[0056] Example 3

[0057] A novel modified oxidized asphalt polyethylene-based waterproof membrane is disclosed in this embodiment. It includes an asphalt layer made of SBS modified asphalt impregnated material, and two composite polyethylene layers located inside the asphalt layer. An inner core layer is provided between adjacent composite polyethylene layers. In this embodiment, the asphalt layer is controlled to be 1.8 mm thick, the composite polyethylene layer to be 4 mm thick, and the inner core layer to be 2 mm thick. A 0.35 mm thick polyester fiberglass cloth layer is provided between the composite polyethylene layers and the inner core layer.

[0058] The difference between this embodiment and Embodiment 1 is that this embodiment does not include nano-silicon oxide, alumina, and ceramic fibers in a mass ratio of 2:1:1, while all other conditions are the same.

[0059] Example 4

[0060] A novel modified oxidized asphalt polyethylene-based waterproof membrane is disclosed in this embodiment. It includes an asphalt layer made of SBS modified asphalt impregnated material, and two composite polyethylene layers located inside the asphalt layer. An inner core layer is provided between adjacent composite polyethylene layers. In this embodiment, the asphalt layer is controlled to be 1.8 mm thick, the composite polyethylene layer to be 4 mm thick, and the inner core layer to be 2 mm thick. A 0.35 mm thick polyester fiberglass cloth layer is provided between the composite polyethylene layers and the inner core layer.

[0061] The difference between this embodiment and Embodiment 1 is that polyvinyl alcohol is not added during the preparation of the inner core layer in this embodiment.

[0062] Example 5

[0063] A novel modified oxidized asphalt polyethylene-based waterproof membrane is disclosed in this embodiment. It includes an asphalt layer made of SBS modified asphalt impregnated material, and two composite polyethylene layers located inside the asphalt layer. An inner core layer is provided between adjacent composite polyethylene layers. In this embodiment, the asphalt layer is controlled to be 1.8 mm thick, the composite polyethylene layer to be 4 mm thick, and the inner core layer to be 2 mm thick. A 0.35 mm thick polyester fiberglass cloth layer is provided between the composite polyethylene layers and the inner core layer.

[0064] The difference between this embodiment and Embodiment 1 is that in this embodiment, no polyester fiberglass cloth layer is provided between the composite polyethylene tire layer and the inner core layer during the preparation of the inner core layer.

[0065] Comparative Example 1

[0066] The difference between Comparative Example 1 and Example 1 is that Comparative Example 1 does not have an inner core layer, while all other conditions are the same.

[0067] Comparative Example 2

[0068] The difference between Comparative Example 2 and Example 1 is that: in this comparative example, no composite polyethylene tire layer is prepared, and polyethylene is used directly to prepare the film layer, and no inner core layer is provided, while other conditions are the same.

[0069] It should be noted that the specific preparation steps of each waterproof membrane in Examples 1-5 above are as follows: After preheating the high-speed shearing machine and adding polyethylene to the molten state, the required components for the composite polyethylene layer are added and mixed. The mixture is then sent to a coating machine for cooling to obtain a film layer of the required thickness for later use. The inner core layer is prepared separately for later use. After cutting according to specifications, each layer is dipped in molten SBS and hot-pressed at 5MPa to form the sample. The sample is then cooled to obtain the sample. According to the conditions of Examples 1-5 and Comparative Examples 1-2 above, square samples with a specification of 20cm are prepared respectively. Waterproofing tests are conducted in a simulated high-temperature environment: Under 50% humidity, accelerated aging tests are conducted at high temperatures of 50℃, 70℃, 90℃, and 110℃ for 240h to simulate and test its high-temperature aging rate and waterproof performance after aging. The specific data are as follows:

[0070]

[0071] According to the data in the table above, the accelerated aging test and characterization show that the inner core layer and the composite polyethylene layer have significant waterproof and high-temperature resistance properties, and the waterproof membrane prepared by this invention has significant high-temperature resistance and waterproof capability.

[0072] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0073] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, "multiple" refers to two or more. Moreover, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0074] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention.

Claims

1. A modified oxidized bitumen polyethylene-based waterproof membrane, comprising a bitumen layer made of modified bitumen impregnator, characterized in that: The waterproof membrane also includes at least two composite polyethylene layers located inside the asphalt layer, with an inner core layer between any two adjacent composite polyethylene layers. The composite polyethylene tire layer uses polyethylene as the base material, and the percentage of other components by mass of polyethylene is as follows: Modified sepiolite: 5-7.5%; Triphenyl phosphate: 1.5-2%; Zinc chloride: 1.4-1.8%; Hexaphenyldistannane: 1.2-1.6%; 2,2'-Methylenebis-(4-methyl-6-tert-butylphenol): 0.8-1.1%; The composite polyethylene tire layer contains a composite high-temperature resistant filler comprising 0.15-0.6% of the polyethylene raw material by mass. The composite high-temperature resistant filler is any one or more of nano-silica, alumina, and ceramic fiber. The inner core layer uses polymethyl methacrylate as the base material, and the specific mass percentage of each component is as follows: Polymethyl methacrylate: 70-76.5%; Butyl acetate: 8-10%; Butyl butyrate: 8-10%; Nano-silicone: 6-8%; Polyvinyl alcohol: 1.5-2%; At least one location, such as between the composite polyethylene tire layer and the inner core layer, inside the composite polyethylene tire layer, or within the inner core layer, is provided with a polyester fiberglass cloth layer.

2. The modified oxidized asphalt polyethylene-based waterproof membrane as described in claim 1, characterized in that: The composite high-temperature resistant filler specifically includes nano-silica, alumina, and ceramic fibers in a mass ratio of 1-2:1:

1.

3. The modified oxidized asphalt polyethylene-based waterproof membrane as described in claim 1, characterized in that: The modified sepiolite preparation process steps are as follows: Step 1: Place the sepiolite raw material in a 0.3-0.5 mol / L NaOH solution and stir for 10-20 minutes; Step 2: Add sepiolite to N,N-dimethylformamide solvent and stir at 1300-1500 r / min for 20-40 min until fully dispersed; Step 3: Add epichlorohydrin to the mixture from Step 2, stir at 300-500 rpm for 1-1.5 h at room temperature, then add polyethyleneimine and stir for 20-30 min. Step 4: Centrifuge, wash, separate, dry, refine, and sieve the mixture.

4. The modified oxidized asphalt polyethylene-based waterproof membrane as described in claim 3, characterized in that: In step three above, 1 wt% of polyethyleneimine is used, and the mass ratio of polyethyleneimine to sepiolite raw material is 1:1.9-2.

1.

5. The modified oxidized asphalt polyethylene-based waterproof membrane as described in claim 3, characterized in that: The particle size range of the modified sepiolite was controlled to be 25-38 μm.

6. The modified oxidized asphalt polyethylene-based waterproof membrane as described in claim 1, characterized in that: The core layer fabrication process steps are as follows: Step 1: Weigh and mix all raw materials according to the specified proportions, then transfer them to the injection molding machine; Step 2: Control the melt blending temperature to 120-150℃, process for 10-20 minutes, and apply a pressure of 10-20 MPa simultaneously; Step 3: Extrusion leveling, followed by cooling and molding with air blowing or a cold water bath.

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