Exposed flame-retardant and melt-drop resistant TPO waterproofing membrane and its preparation method

Abstract

The present application discloses an exposed flame-retardant and anti-melting TPO waterproofing coil and a preparation method thereof. The waterproofing coil comprises: a fiber mesh cloth layer and a TPO layer arranged on both sides of the fiber mesh cloth to cover the fiber mesh cloth layer; the TPO layer comprises the following components by weight: TPO elastomer, 60-80 parts; flame retardant component, 3-30 parts; light stabilizer, 2-5 parts; compatibilizer, 1-5 parts; antioxidant, 0.1-1 part; masterbatch, 1-4 parts; the fiber mesh cloth layer comprises the following components by weight: PET resin, 60-80 parts; magnesium hydroxide, 5-20 parts; graphene oxide, 0.1-1 part; cross-linking agent, 0.2-1 part; PE wax, 0.5-2 parts; antioxidant, 0.1-0.5 parts. The exposed flame-retardant and anti-melting TPO waterproofing coil of the embodiment of the present application can improve the flame retardant performance and melting point of the waterproofing coil, thereby effectively improving the safety of the TPO waterproofing coil.

Description

Technical Field

[0001] This application belongs to the technical field of waterproof coiled materials, and particularly relates to an exposed flame-retardant and anti-melting-drop TPO waterproof coiled material and a preparation method thereof. Background Art

[0002] Thermoplastic polyolefin (TPO) is a new material that has received wide attention in the waterproof industry in recent years, and its main material is a copolymer of ethylene and propylene. Since the molecular chain of TPO is saturated, the content of tertiary carbon atoms is relatively small, and it does not contain polar atoms, so it has chemical stability. In addition, this material has good processing performance of plastics and good toughness of rubber, and has a low density and excellent low-temperature toughness. At the same time, it can be processed by conventional equipment, and it is a new material with good application prospects.

[0003] However, with the continuous development of the market in recent years and the implementation of the new building waterproof construction standard "GB 55030-2022", higher requirements have been put forward for various indicators of waterproof coiled materials, including the flame-retardant performance of waterproof coiled materials. For the common TPO-P coiled material in single-layer roofs, that is, the coiled material with the structure of "TPO layer + reinforcing rib + TPO layer", higher requirements have also been put forward for its flame-retardant performance and exposed performance. As a research hotspot, graphene oxide (GO) has been used to improve the thermal stability and light stability of TPO waterproof coiled materials in existing technologies. However, existing technologies generally graft and purify graphene oxide on the surface through a multi-step solution method to finally obtain a graphene oxide-grafted polymer. This method has the disadvantages of cumbersome surface modification of graphene oxide and is not suitable for large-scale popularization and application in industrial applications. Moreover, the dispersion of graphene oxide directly added to the TPO layer is poor, the TPO layer and the fiber layer are flammable, and the organic molecules in the TPO layer and the fiber layer are prone to flow and drip at high temperatures generated by combustion, resulting in poor safety. Summary of the Invention

[0004] The embodiment of this application provides an exposed flame-retardant and anti-melting-drop TPO waterproof coiled material, which can improve the flame-retardant performance, anti-melting-drop performance and melting point of the waterproof coiled material, thereby effectively improving the safety of the TPO waterproof coiled material.

[0005] In the first aspect, the present application provides an exposed flame-retardant and anti-drip TPO waterproof coil, comprising: a fiber mesh cloth layer, and a TPO layer arranged on both sides of the fiber mesh cloth layer to cover the fiber mesh cloth layer; wherein, the TPO layer comprises the following components in parts by weight: TPO elastomer, 60 to 80 parts; compatibilizer, 1 to 5 parts; flame retardant component, 3 to 30 parts; antioxidant, 0.1 to 1 part; light stabilizer, 2 to 5 parts; masterbatch, 1 to 4 parts; the fiber mesh cloth layer comprises the following components in parts by weight: PET resin, 60 to 80 parts; magnesium hydroxide, 5 to 20 parts; graphene oxide, 0.1 to 1 part; cross-linking agent, 0.2 to 1 part; PE wax, 0.5 to 2 parts; antioxidant, 0.1 to 0.5 parts.

[0006] According to an embodiment of the first aspect of the present application, the TPO elastomer is selected from Basel CA10A, Basel CA60A, Dow 2300, ExxonMobil 3020, ExxonMobil 3000 or a combination thereof.

[0007] According to an embodiment of the first aspect of the present application, the flame retardant component includes a flame retardant and a TPO functional masterbatch; wherein the flame retardant is selected from magnesium hydroxide, silicone flame retardant, piperazine pyrophosphate, antimony trioxide or a combination thereof.

[0008] According to an embodiment of the first aspect of the present application, magnesium hydroxide may be used alone as a flame retardant.

[0009] According to the embodiment of the first aspect of the present application, the flame retardant uses magnesium hydroxide as the main flame retardant, and one or more of the other flame retardants other than magnesium hydroxide are used as auxiliary flame retardants, wherein the mass ratio of the main flame retardant to the auxiliary flame retardant is (7-10):1.

[0010] According to an embodiment of the first aspect of the present application, the mass ratio of the flame retardant to the TPO functional masterbatch is (1-5):1.

[0011] According to the embodiment of the first aspect of the present application, the particle size of magnesium hydroxide needs to satisfy: 50 ≤1.7μm, D 90 ≤3.5μm.

[0012] According to an embodiment of the first aspect of the present application, the organosilicon flame retardant is selected from SFR 100 halogen-free silicone flame retardant, silicone-based halogen-free transparent liquid flame retardant, transparent silicone flame retardant or a combination thereof.

[0013] According to an embodiment of the first aspect of the present application, the raw materials of the TPO functional masterbatch include thermoplastic polyolefin, maleic anhydride, a cross-linking agent, and graphene oxide in a mass ratio of 1: (0.01-0.03): (0.0025-0.0075): (0.025-0.15).

[0014] According to an embodiment of the first aspect of the present application, the TPO functional masterbatch is prepared according to the following steps:

[0015] Thermoplastic polyolefin, maleic anhydride, crosslinking agent and graphene oxide are dispersed and granulated and extruded at 180°C to 200°C in a ratio of 1:(0.01 - 0.03):(0.0025 - 0.0075):(0.025 - 0.15) to obtain a TPO functional masterbatch containing graphene oxide grafted polymer.

[0016] According to an embodiment of the first aspect of the present application, the crosslinking agent is selected from dicumyl peroxide, benzoyl peroxide, di(tert-butylperoxyisopropyl)benzene or a combination thereof.

[0017] According to an embodiment of the first aspect of the present application, the light stabilizer is selected from 2020, UV-234, UV-238, 770 or a combination thereof.

[0018] According to an embodiment of the first aspect of the present application, the PET resin is selected from DuPont 415HP in the United States, Yuanfang-CH-610 in Shanghai, Yuanfang-CB-608S in Shanghai, CR8816 of China Resources Chemical or a combination thereof.

[0019] According to an embodiment of the first aspect of the present application, the PE wax selected is a PE wax with a softening point of 100°C to 115°C.

[0020] According to an embodiment of the first aspect of the present application, the PE wax is selected from Q-18PE, R-110, Cerelene691.

[0021] According to an embodiment of the first aspect of the present application, the compatibilizer includes one or more of PP-g-MAH, PP-g-GMA, PP-g-PHEMA, POE-g-MAH, PE-g-MAH.

[0022] According to an embodiment of the first aspect of the present application, the antioxidant is selected from antioxidant 1010, 168, 1076, 246 or a combination thereof.

[0023] According to an embodiment of the first aspect of the present application, the requirements for graphene oxide are: D 50 is 7 - 12 μm and the number of layers is 1 - 3 layers.

[0024] According to an embodiment of the first aspect of the present application, the monolayer rate in graphene oxide > 80%.

[0025] According to an embodiment of the first aspect of the present application, the fiber grid cloth layer needs to meet at least one of the following requirements:

[0026] (1) 100 g / m 2 ~150 g / m 2 ;

[0027] (2) The size of the smallest cell is 5 mm × 5 mm to 9 mm × 9 mm.

[0028] According to an embodiment of the first aspect of the present application, the width of the fiber mesh cloth layer is 1900 mm to 1980 mm.

[0029] In a second aspect, the present application provides a method for preparing an exposed flame-retardant and melt-drop resistant TPO waterproof coil, including:

[0030] Providing a TPO layer;

[0031] Providing a fiber mesh cloth layer;

[0032] Covering one side surface of a TPO layer with the fiber mesh cloth layer and laminating them into one body to obtain a first composite layer;

[0033] Covering another TPO layer on the side of the fiber mesh cloth layer facing away from the TPO layer in the first composite layer to prepare the exposed flame-retardant and melt-drop resistant TPO waterproof coil.

[0034] According to an embodiment of the second aspect of the present application, providing the TPO layer includes: dispersing each component according to the component ratio of the TPO layer to obtain a raw material mixture; extruding and molding the raw material mixture at 145°C to 225°C to obtain the TPO layer. The flame retardant of the flame retardant component and the TPO functional masterbatch are added separately.

[0035] According to an embodiment of the second aspect of the present application, providing the fiber mesh cloth layer includes: dispersing the raw materials of the fiber mesh cloth layer according to the formula and performing melt blending at 240°C to 280°C to prepare a crosslinked high flame-retardant and melt-drop resistant PET composite material;

[0036] Performing melt spinning on the crosslinked high flame-retardant and melt-drop resistant PET composite material, with the melt temperature being 270°C to 330°C, to prepare a crosslinked fiber mesh cloth layer.

[0037] For the exposed flame-retardant and melt-drop resistant TPO waterproof coil of the embodiment of the present application, on the one hand, on the premise of not affecting the spinnability of polyester fiber, magnesium hydroxide is selected as the main flame retardant of the fiber mesh cloth layer, and a crosslinking agent is used to crosslink the PET resin to form a network structure, effectively improving the flame retardancy and melt-drop resistance of the PET fiber mesh cloth layer. On the other hand, the TPO layer is flame-retarded by a flame retardant component and synergistically flame-retarded with the fiber mesh cloth layer to prevent the TPO coil from melting and dripping, realizing the improvement of the flame retardancy and melting point of the waterproof coil, that is, having better thermal stability and light stability, thereby effectively improving the overall safety of the exposed flame-retardant and melt-drop resistant TPO waterproof coil. Detailed implementation manners

[0038] The features and exemplary embodiments of various aspects of the present application will be described in detail below. In order to make the purpose, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in conjunction with specific embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present application, rather than to limit the present application. For those skilled in the art, the present application can be implemented without the need for some of these specific details. The following description of the embodiments is only to provide a better understanding of the present application by illustrating the examples of the present application.

[0039] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "include..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0040] The inventor of the present application found that: there is no flame retardant modification scheme for the reinforcement ribs in TPO waterproofing membranes in the prior art. The inventor of the present application further found that: the key point of graphene oxide playing a flame retardant role in TPO waterproofing membranes is to improve the dispersion of graphene oxide in the TPO waterproofing membrane matrix.

[0041] In order to solve the problems of the prior art, the embodiments of the present application provide an exposed flame-retardant and anti-drip TPO waterproof membrane and a preparation method thereof.

[0042] The following first introduces the exposed flame-retardant and anti-drip TPO waterproof membrane of the embodiment of the present application.

[0043] The exposed flame-retardant and anti-drip TPO waterproof coiled material of the embodiment of the present application includes: a fiber mesh cloth layer, and a TPO layer arranged on both sides of the fiber mesh cloth layer to cover the fiber mesh cloth layer; wherein, the TPO layer includes the following components in parts by weight: TPO elastomer, 60 to 80 parts; compatibilizer, 1 to 5 parts; flame retardant component, 3 to 30 parts; antioxidant, 0.1 to 1 part; light stabilizer, 2 to 5 parts; masterbatch, 1 to 4 parts; in parts by weight, the fiber mesh cloth layer includes the following components: PET resin, 60 to 80 parts; magnesium hydroxide, 5 to 20 parts; graphene oxide, 0.1 to 1 part; cross-linking agent, 0.2 to 1 part; PE wax, 0.5 to 2 parts; antioxidant, 0.1 to 0.5 parts.

[0044] For the exposed flame-retardant and melt-drop resistant TPO waterproof coil in the embodiments of the present application, on the one hand, without affecting the spinnability of polyester fiber, magnesium hydroxide is selected as the main flame retardant of the fiber mesh layer, and a crosslinking agent is used to crosslink the PET resin to form a network structure, effectively improving the flame retardancy and melt-drop resistance of the PET fiber mesh layer. On the other hand, the TPO layer is flame-retarded by a flame-retardant component and synergistically flame-retarded with the fiber mesh layer to prevent the TPO coil from dripping after melting, realizing the improvement of the flame retardancy and melting point of the waterproof coil, that is, having better thermal stability and light stability, thereby effectively improving the safety of the exposed flame-retardant and melt-drop resistant TPO waterproof coil.

[0045] In some embodiments of the present application, the TPO elastomer is selected from Basell CA10A, Basell CA60A, Dow 2300, ExxonMobil 3020, ExxonMobil 3000 or a combination thereof. The exposed flame-retardant and melt-drop resistant TPO waterproof coil prepared by using the above TPO elastomer has good weather resistance and good construction performance.

[0046] In some embodiments of the present application, the flame-retardant component includes a flame retardant and a TPO functional masterbatch. Among them, the flame retardant is selected from magnesium hydroxide, silicone flame retardant, piperazine pyrophosphate, antimony trioxide or a combination thereof.

[0047] In some embodiments of the present application, the silicone flame retardant is selected from SFR 100 halogen-free silicone flame retardant, silicone-based halogen-free transparent liquid flame retardant, transparent silicone rubber flame retardant or a combination thereof. Exemplarily, SFR 100 halogen-free silicone flame retardant purchased from Shanghai Sangjing Chemical Co., Ltd., silicone-based halogen-free transparent liquid flame retardant purchased from Shenzhen Dianshifang Technology Co., Ltd., and transparent silicone rubber flame retardant purchased from Dongguan Daoer New Material Technology Co., Ltd. can be used.

[0048] In some embodiments of the present application, the flame retardant uses magnesium hydroxide as the main flame retardant and one or more of several other flame retardants other than magnesium hydroxide as auxiliary flame retardants, and the mass ratio of the main flame retardant to the auxiliary flame retardant is (7-10):1.

[0049] In the embodiments of the present application, magnesium hydroxide as the main flame retardant can not only effectively improve the strength of the TPO layer, but also produce a synergistic effect with graphene oxide to effectively improve the flame retardancy of the TPO layer.

[0050] In some embodiments of the present application, the mass ratio of the flame retardant to the TPO functional masterbatch is (1-5):1.

[0051] In some embodiments of the present application, the raw materials of the TPO functional masterbatch include thermoplastic polyolefin, maleic anhydride, crosslinking agent, and graphene oxide with a mass ratio of 1:(0.01 - 0.03):(0.0025 - 0.0075):(0.025 - 0.15). Among them, the TPO functional masterbatch is prepared according to the following steps: thermoplastic polyolefin (TPO), maleic anhydride (MAH), crosslinking agent, and graphene oxide (GO) are dispersed and granulated and extruded at a mass ratio of 1:(0.01 - 0.03):(0.0025 - 0.0075):(0.025 - 0.15) at 180°C - 200°C to obtain a TPO functional masterbatch containing graphene oxide grafted polymer (i.e., GO-g-TPO).

[0052] In the exposed flame-retardant and anti-melting-drip TPO waterproof coil of the embodiment of the present application, the TPO layer is obtained by melt blending modification and contains a TPO functional masterbatch functionalized with GO-g-TPO, which effectively improves the dispersibility of graphene oxide in the TPO matrix, and then enables the TPO waterproof coil to achieve a better modification effect, and cooperate with the flame retardant to prevent the TPO coil from dripping after melting, realizing the improvement of the flame retardant performance and melting point of the waterproof coil, that is, having better thermal stability and light stability performance.

[0053] Exemplarily, thermoplastic polyolefin (TPO), maleic anhydride, crosslinking agent, and graphene oxide (GO) are added to a granulator at a mass ratio of 1:(0.01 - 0.03):(0.0025 - 0.0075):(0.025 - 0.15). The processing temperature of the granulator is 180°C - 200°C, and the screw speed is 30 rpm - 50 rpm. Then, it is extruded and cooled to granulate, and finally a TPO functional masterbatch containing graphene oxide grafted polymer (i.e., GO-g-TPO) functionalized GO is obtained.

[0054] In the embodiment of the present application, the TPO functional masterbatch can physically crosslink with the TPO molecules in the TPO layer, that is, the graphene oxide grafted polymer (GO-g-TPO) dispersed in the TPO layer physically crosslinks and entangles with the molecular chains of the TPO resin, enhancing the self-crosslinking of the TPO layer and playing a role in anti-melting-drip and flame retardancy.

[0055] In some embodiments of the present application, the requirements for graphene oxide are: D 50It is 7 - 12 μm, the number of layers of graphene oxide is 1 - 3 layers, and the monolayer ratio of graphene oxide > 80%. Among them, the monolayer ratio of graphene oxide refers to the proportion of monolayer graphene oxide in all graphene oxide being greater than 80%. Using graphene oxide with a monolayer ratio > 80% can be fully mixed with TPO molecules in the TPO layer, while enhancing the flame retardant performance of the TPO layer, it can also effectively improve the mechanical properties of the TPO layer. Among them, the edge positions of graphene oxide with a lamellar structure are rich in hydroxyl and carboxyl groups, which can come into full contact with maleic anhydride-modified TPO and undergo dehydration reaction to prepare a TPO functional masterbatch containing graphene oxide grafted polymer (i.e., GO-g-TPO).

[0056] In the examples of this application, a granulator is used to blend and melt-graft polymerize thermoplastic polyolefin, maleic anhydride, crosslinking agent, and graphene oxide, which can make the dispersion of graphene oxide in the TPO functional masterbatch better, greatly improve the dispersion of graphene oxide, and then ensure that graphene oxide comes into full contact with maleic anhydride-modified TPO and undergoes dehydration reaction to obtain a TPO functional masterbatch containing GO-g-TPO. Compared with the solution method with multiple steps for preparing graphene oxide grafted polymer, it is simpler and more convenient, and is suitable for industrial production. Subsequently, the TPO functional masterbatch is secondarily blended and dispersed with other components in the TOP layer, which can further ensure the dispersion of GO-g-TPO in the TPO functional masterbatch in the TPO layer, and better synergistically flame retard with magnesium hydroxide to obtain the TPO layer. At the same time, using the TPO functional masterbatch containing GO-g-TPO and blending it with other materials in the TPO layer can improve the barrier performance of the TPO layer. Due to the special structure of GO-g-TPO, it can better physically entangle with the TPO macromolecular chains in the TPO layer, thereby better restricting the mobility of TPO molecular chains and improving the overall thermal stability and anti-melting droplet performance of the exposed flame retardant and anti-melting droplet TPO waterproof coil.

[0057] In some examples of this application, the crosslinking agent is selected from dicumyl peroxide (DCP), benzoyl peroxide (BPO), bis(tert-butylperoxyisopropyl)benzene (BIBP), or a combination thereof.

[0058] In the examples of this application, the PET resin in the fiber mesh cloth layer is crosslinked by a crosslinking agent to form a network structure, improving the anti-melting droplet performance of the fiber mesh cloth layer. At the same time, using the technical means of crosslinking with a crosslinking agent to directly seal magnesium hydroxide as the main flame retardant in the polyester fiber microstructure of the fiber mesh cloth layer can not only effectively improve the strength of the fiber mesh cloth layer, but also effectively improve the flame retardant performance of the fiber mesh cloth layer, completely plugging the flame retardant loopholes existing in the existing waterproof coils and effectively improving the flame retardant performance of the waterproof coils.

[0059] In some embodiments of the present application, the particle size of magnesium hydroxide needs to satisfy: D 50 ≤ 1.7 μm, D 90 ≤ 3.5 μm. By selecting magnesium hydroxide with the above particle size, without affecting the spinnability of polyester fibers, magnesium hydroxide can act as an effective flame retardant in the fiber grid cloth layer. Magnesium hydroxide that meets the defined particle size can not only play a synergistic role with the TPO functional masterbatch, better limit the mobility of TPO molecular chains in the TPO layer at high temperatures, thereby reducing the melt flow rate, and achieving the purpose of improving the anti-melting drop performance of the exposed flame-retardant and anti-melting drop TPO waterproof coil. At the same time, graphene oxide with a specific layered structure in the TPO functional masterbatch can be fully dispersed in the TPO layer, which can play a barrier effect, reduce the oxygen penetration rate, and delay the combustion rate of the TPO layer. The uniformly dispersed magnesium hydroxide in the TPO layer realizes flame retardancy when the TPO layer burns, and synergizes with graphene oxide, thereby effectively improving the flame retardant performance of the exposed flame-retardant and anti-melting drop TPO waterproof coil.

[0060] In some embodiments of the present application, the light stabilizer is selected from 2020, UV-234, UV-238, 770 or a combination thereof. Adding a light stabilizer can further improve the light stability of the waterproof coil, prevent the waterproof coil from being damaged when exposed to the external light environment, and extend the service life of the waterproof coil.

[0061] In some embodiments of the present application, the PET resin is selected from DuPont 415HP in the United States, Shanghai Yuanyang - CH-610, Shanghai Yuanyang - CB-608S, China Resources Chemical CR8816 or a combination thereof. By selecting the above PET resin, the fiber grid cloth layer can have appropriate strength and can also crosslink with the TPO molecules in the TPO layer, making the overall waterproof coil have suitable mechanical properties.

[0062] In some embodiments of the present application, the PE wax selected is a PE wax with a softening point of 100 °C to 115 °C. The PE wax appears as white flakes or granules, and the PE wax with the trade name Q-18PE from Wuhan Xindongyi Chemical Co., Ltd., the PE wax with the trade name R-110 from Henan Tianchou Chemical Products Co., Ltd., and the PE wax with the trade name Cerelen e 691 from Shijiazhuang Guanchi Chemical Technology Co., Ltd. can be selected.

[0063] In some embodiments of the present application, the compatibilizer includes one or more of PP-g-MAH, PP-g-GMA, PP-g-PHEMA, POE-g-MAH, PE-g-MAH. Exemplarily, the compatibilizer can be PP-g-MAH purchased from Sigma-Aldrich, PE-g-MAH purchased from Mitsui Chemicals, and POE-g-MAH purchased from ExxonMobil.

[0064] In some embodiments of the present application, the antioxidant is selected from antioxidant 1010, 168, 1076, 246 or a combination thereof. The antioxidant can further enhance the antioxidant properties of the waterproof coiled material, prevent the waterproof coiled material from being oxidized when exposed to an outdoor oxidation environment, and effectively improve the service life of the waterproof coiled material.

[0065] In some embodiments of the present application, the fiber mesh cloth layer needs to meet at least one of the following requirements:

[0066] (1) 100 g / m 2 ~150 g / m 2 ;

[0067] (2) The size of the smallest cell is 5 mm × 5 mm to 9 mm × 9 mm.

[0068] In the embodiments of the present application, in order to make the fiber mesh cloth layer have appropriate mechanical properties, it is necessary to make it meet the weight requirement of 100 g to 150 g per square meter. Optionally, to adapt to different flame retardant and waterproof requirements, the size of the smallest unit of the fiber mesh cloth layer is 5 mm × 5 mm to 9 mm × 9 mm. The present application does not limit the thickness of the fiber mesh cloth layer, and the corresponding thickness of the TPO layer and the fiber mesh cloth layer can be selected according to the flame retardant and waterproof requirements.

[0069] In some embodiments of the present application, the width of the fiber mesh cloth layer is 1900 mm to 1980 mm.

[0070] Second, the present application provides a method for preparing an exposed flame retardant and anti-melting drip TPO waterproof coiled material, including: providing a TPO layer; providing a fiber mesh cloth layer; covering one side surface of the TPO layer with the fiber mesh cloth layer and laminating them into one body to obtain a first composite layer; covering a layer of TPO layer on the side of the fiber mesh cloth layer facing away from the TPO layer in the first composite layer to prepare an exposed flame retardant and anti-melting drip TPO waterproof coiled material.

[0071] In some embodiments of the present application, providing the TPO layer includes: dispersing each component according to the component ratio of the TPO layer to obtain a raw material mixture; extruding and molding the raw material mixture at 145°C to 225°C to obtain the TPO layer.

[0072] In the embodiments of the present application, the preparation method of the fiber mesh cloth layer is as follows:

[0073] S1. Add the raw materials of the fiber mesh cloth layer into a mixing device according to the formula for dispersion, and carry out melt blending at 240°C to 280°C to prepare a crosslinked high flame retardant and anti-melting drip PET composite material;

[0074] S2. The cross-linked highly flame-retardant and anti-drip PET composite material is melt-spinned, with a melt temperature of 270°C to 330°C, a spinning speed of 1000m / min to 1500m / min, a hot roller traction multiple of 3 to 8 times, an annular cold air temperature of 10°C to 30°C, and a blowing speed of 0.5m / s to 1.5m / s, to finally obtain a cross-linked fiber mesh cloth layer.

[0075] Exemplarily, a method for preparing an exposed flame-retardant and anti-melting dripping TPO waterproofing membrane comprises: according to the component ratio of the TPO layer, adding each component to a high-speed mixer and dispersing them by stirring to obtain a raw material mixture; conveying the mixed raw material mixture to the hopper of the first extruder, and making the first extruder extrude and mold under the conditions of 145°C to 225°C and a screw speed of 10rpm to 40rpm to obtain a TPO layer; compounding the surface of one side of the TPO layer covered with a fiber mesh cloth with the TPO layer to obtain a first composite layer; then, extruding another TPO layer through a second extruder with the same extrusion parameters as the first extruder, in which the fiber mesh layer in the first composite layer is covered with another TPO layer on the side away from the TPO layer, and calendering and compounding are performed through a pressing roller to form an exposed flame-retardant and anti-melting dripping TPO waterproofing membrane with a three-layer structure of TPO layer-fiber mesh cloth layer-TPO layer. The overall line speed is maintained at 3m / mi n ~6m / m i n After calendering, pulling and winding processes, the exposed flame retardant and anti-drip TPO waterproof membrane can be obtained.

[0076] The exposed flame retardant and anti-melting drip TPO waterproof membrane of the present application adopts the method of adding flame retardant components (magnesium hydroxide and graphene oxide) to the fiber mesh cloth layer and cross-linking the PET resin itself, which effectively improves the problem of flammability and generation of molten droplets in the exposed flame retardant and anti-melting drip TPO waterproof membrane, thereby improving the overall safety of the exposed flame retardant and anti-melting drip TPO waterproof membrane product.

[0077] The following are the raw material components and / or their available sources or abbreviations used in some embodiments: TPO elastomer is Dow 2300. PET resin, model 415HP, purchased from DuPont, USA. Maleic anhydride, abbreviated as MAH. Compatibilizer: PP-g-MAH, purchased from Sigma-Aldrich; PE-g-MAH, purchased from Mitsui Chemicals; POE-g-MAHH, purchased from ExxonMobil. Graphene oxide (GO), model: TL-dcyhsmx, D 50It is 7 - 12 μm; the number of layers of graphene oxide is 1 - 3 layers, the monolayer rate > 80%, and it is purchased from Shenzhen Turing Evolution Technology Co., Ltd. (TuLing JinHua KeJi). The cross - linker is dicumyl peroxide, the antioxidant is antioxidant 1010, and the light stabilizer is UV - 234. Raw materials or components not mentioned in the examples or comparative examples of this application can be obtained through commercial channels and meet the limitations of this application, and will not be elaborated here.

[0078] Example 1

[0079] Preparation method of the fiber mesh cloth layer:

[0080] Add the component ratios corresponding to the fiber mesh cloth layer in Example 5 in Table 2 into the equipment, and carry out melt blending at 260 °C to obtain a cross - linked high - flame - retardant and anti - melt - dripping PET composite material; carry out melt spinning on the cross - linked high - flame - retardant and anti - melt - dripping PET composite material, the melt temperature is 280 °C, the spinning speed is 1000 m / min, the hot roll drawing ratio is 3 times, the temperature of the annular blowing cold air is 15 °C, and the blowing speed is 0.5 m / s, and finally obtain a cross - linked PET fiber mesh cloth layer. That is, the composition and preparation process of the fiber mesh cloth layer in Example 1 and Example 5 are the same.

[0081] Preparation method of the TPO functional masterbatch:

[0082] Add 200 g of TPO, 2 g of maleic anhydride, i.e., MAH, 0.5 g of DCP, and 10 g of graphene oxide into a small granulator, the processing temperature is 180 °C, the screw speed is 30 rpm, and then extrude and cool to granulate, and finally obtain a TPO functional masterbatch containing GO - g - TPO, that is, a TPO functional masterbatch containing graphene oxide grafted polymer.

[0083] Preparation method of the exposed flame - retardant and anti - melt - dripping TPO waterproof coil:

[0084] Add the upper - layer light - color formula according to the component ratio of the TPO layer into a high - speed mixer and stir at room temperature for dispersion to obtain a raw material mixture; convey the mixed raw material mixture to the hopper of the extruder, and extrude and form at 150 °C - 170 °C and a screw speed of 10 rpm to obtain a TPO layer; cover one side surface of the TPO layer with the fiber mesh cloth layer and composite them into one body to obtain a first composite layer; then extrude and form another TPO layer through the extruder, cover another TPO layer on the side of the fiber mesh layer facing away from the TPO layer in the first composite layer, and carry out calendering and compounding through a calender roll, and the overall linear speed is kept at 4 m / min. After processes such as calendering, traction, and winding, an exposed flame - retardant and anti - melt - dripping TPO waterproof coil with a three - layer structure of TPO - fiber mesh cloth layer - TPO is formed.

[0085] Example 2

[0086] Provided is an exposed flame-retardant and anti-melting-dripping TPO waterproof coiled material. Its PET fiber grid cloth layer and its preparation method are the same as those in Example 1. The preparation method of the exposed flame-retardant and anti-melting-dripping TPO waterproof coiled material in Example 2 is the same as that in Example 1. Compared with Example 1, the difference lies in that: in the TPO functional masterbatch of the exposed flame-retardant and anti-melting-dripping TPO waterproof coiled material in Example 2, the dosage of DCP is 0.75 g and the dosage of graphene oxide is 20 g.

[0087] Example 3

[0088] Provided is an exposed flame-retardant and anti-melting-dripping TPO waterproof coiled material. Its PET fiber grid cloth layer and its preparation method are the same as those in Example 1. The preparation method of the exposed flame-retardant and anti-melting-dripping TPO waterproof coiled material in Example 3 is the same as that in Example 1. Compared with Example 2, the difference lies in that: in the TPO functional masterbatch of the exposed flame-retardant and anti-melting-dripping TPO waterproof coiled material in Example 3, the dosage of graphene oxide is 30 g.

[0089] Example 4

[0090] Provided is an exposed flame-retardant and anti-melting-dripping TPO waterproof coiled material. The preparation method of its PET fiber grid cloth layer is the same as that in Example 1. The preparation method of the exposed flame-retardant and anti-melting-dripping TPO waterproof coiled material in Example 4 is the same as that in Example 1. Compared with Example 2, the difference lies in that: in the TPO functional masterbatch of the exposed flame-retardant and anti-melting-dripping TPO waterproof coiled material in Example 4, the dosage of MAH is 4 g, the dosage of DCP is 1.5 g, and the dosage of graphene oxide is 30 g.

[0091] Comparative Examples 1 to 3

[0092] Comparative Examples 1 to 3 all provide an exposed flame-retardant and anti-melting-dripping TPO waterproof coiled material. Among them, the PET fiber grid cloth layer and its preparation method are the same as those in Example 1. The preparation methods of the exposed flame-retardant and anti-melting-dripping TPO waterproof coiled materials in Comparative Examples 1 to 3 are the same as those in Example 1. Compared with Example 2, the differences are as follows: the TPO functional masterbatch of the exposed flame-retardant and anti-melting-dripping TPO waterproof coiled material in Comparative Example 1 does not contain graphene oxide; the flame-retardant component of the exposed flame-retardant and anti-melting-dripping TPO waterproof coiled material in Comparative Example 2 does not contain magnesium hydroxide, and the TPO functional masterbatch does not contain graphene oxide; the flame-retardant component of the exposed flame-retardant and anti-melting-dripping TPO waterproof coiled material in Comparative Example 3 does not contain magnesium hydroxide and does not contain the TPO functional masterbatch.

[0093] Comparative Example 4

[0094] Provide an exposed flame-retardant and anti-melting-dripping TPO waterproof coil. Its PET fiber mesh layer and its preparation method are the same as those in Example 1. Prepare the TPO layer by using the same TPO preparation method as in Example 1 according to the formulation ratio of the TPO layer in Comparative Example 4 in Table 1. Among them, the flame-retardant component only contains 20 parts of magnesium hydroxide and does not contain the TPO functional masterbatch.

[0095] Example 5

[0096] Preparation method of the fiber mesh layer:

[0097] Add the raw materials of the fiber mesh layer into the equipment according to the formulation ratio of Example 5 in Table 2, and carry out melt blending at 260 °C to obtain a cross-linked highly flame-retardant and anti-melting-dripping PET composite material; carry out melt spinning on the cross-linked highly flame-retardant and anti-melting-dripping PET composite material, the melt temperature is 280 °C, the spinning speed is 1000 m / min, the hot roll drawing ratio is 3 times, the temperature of the annular blowing cold air is 15 °C, and the blowing speed is 0.5 m / s, and finally obtain a cross-linked PET fiber mesh layer.

[0098] Preparation method of the TPO functional masterbatch:

[0099] Add 200 g of TPO, 2 g of MAH, 0.5 g of DCP and 10 g of graphene oxide into a small granulator, the processing temperature is 180 °C, the screw speed is 30 rpm, and then extrude and cool to granulate, and finally obtain a TPO functional masterbatch containing GO-g-TPO, that is, a TPO functional masterbatch containing graphene oxide grafted polymer.

[0100] That is, prepare the TPO layer according to the component ratio of the TPO layer in Example 1 and use it as the TPO layer in Example 5. Preparation method of the exposed flame-retardant and anti-melting-dripping TPO waterproof coil:

[0101] Add the upper light-colored formulation into a high-speed mixer according to the formulation ratio of the TPO layer and stir at room temperature for dispersion to obtain a raw material mixture; convey the mixed raw material mixture to the hopper of the extruder, and extrude and form at 150 °C to 170 °C and a screw speed of 10 rpm to obtain a TPO layer; cover one side surface of the TPO layer with the fiber mesh layer and composite it with the TPO layer to obtain a first composite layer; immediately extrude and form another TPO layer through the extruder, cover another TPO layer on the side of the fiber mesh layer facing away from the TPO layer in the first composite layer, and carry out calendering and compounding through a calender roll, and the overall linear speed is kept at 4 m / mi n , and form an exposed flame-retardant and anti-melting-dripping TPO waterproof coil with a three-layer structure of TPO-fiber mesh layer-TPO through processes such as calendering, traction and winding.

[0102] Example 6

[0103] Provide an exposed flame-retardant and anti-melting-dripping TPO waterproof coil, the TPO layer and its preparation method are the same as those in Example 5. The preparation method of the exposed flame-retardant and anti-melting-dripping TPO waterproof coil in Example 6 is the same as that in Example 5. Compared with Example 5, the difference lies in that the components of the fiber grid cloth layer are different. Add the raw materials of the fiber grid cloth layer into the equipment according to the ratio corresponding to the fiber grid cloth layer in Example 6 in Table 2, and carry out melt blending at 260 °C to obtain a cross-linked high flame-retardant and anti-melting-dripping PET composite material; carry out melt spinning on the cross-linked high flame-retardant and anti-melting-dripping PET composite material, the melt temperature is 280 °C, the spinning speed is 1000 m / min, the hot roll drawing ratio is 3 times, the temperature of the annular blowing cold air is 15 °C, and the blowing speed is 0.5 m / s, and finally obtain a cross-linked PET fiber grid cloth layer.

[0104] Example 7

[0105] Provide an exposed flame-retardant and anti-melting-dripping TPO waterproof coil, the TPO layer and its preparation method are the same as those in Example 5. The preparation method of the exposed flame-retardant and anti-melting-dripping TPO waterproof coil in Example 7 is the same as that in Example 5. Compared with Example 5, the difference lies in that the components of the fiber grid cloth layer are different. Add the raw materials of the fiber grid cloth layer into the equipment according to the ratio of Example 7 in Table 2, and carry out melt blending at 260 °C to obtain a cross-linked high flame-retardant and anti-melting-dripping PET composite material; carry out melt spinning on the cross-linked high flame-retardant and anti-melting-dripping PET composite material, the melt temperature is 280 °C, the spinning speed is 1000 m / min, the hot roll drawing ratio is 3 times, the temperature of the annular blowing cold air is 15 °C, and the blowing speed is 0.5 m / s, and finally obtain a cross-linked PET fiber grid cloth layer.

[0106] Example 8

[0107] Provide an exposed flame-retardant and anti-melting-dripping TPO waterproof coil, the TPO layer and its preparation method are the same as those in Example 5. The preparation method of the exposed flame-retardant and anti-melting-dripping TPO waterproof coil in Example 8 is the same as that in Example 5. Compared with Example 5, the difference lies in that the components of the fiber grid cloth layer are different. Add the raw materials of the fiber grid cloth layer into the equipment according to the ratio of Example 8 in Table 2, and carry out melt blending at 260 °C to obtain a cross-linked high flame-retardant and anti-melting-dripping PET composite material; carry out melt spinning on the cross-linked high flame-retardant and anti-melting-dripping PET composite material, the melt temperature is 280 °C, the spinning speed is 1000 m / min, the hot roll drawing ratio is 3 times, the temperature of the annular blowing cold air is 15 °C, and the blowing speed is 0.5 m / s, and finally obtain a cross-linked PET fiber grid cloth layer.

[0108] Comparative Examples 5 to 7

[0109] Comparative Examples 5 to 7 all provide an exposed flame-retardant and melt-drop resistant TPO waterproof coil. The TPO layer and its preparation method are the same as those in Example 5. The preparation methods of the exposed flame-retardant and melt-drop resistant TPO waterproof coils in Comparative Examples 5 to 7 are the same as those in Example 5. The corresponding PET fiber mesh cloth layers and the exposed flame-retardant and melt-drop resistant TPO waterproof coils in Comparative Examples 5 to 7 are prepared according to the ratios of the fiber mesh cloth layers in Comparative Examples 5 to 7 in Table 2 and the preparation method of the fiber mesh cloth layer in Example 5.

[0110] Table 1 Ratios of the TPO Layers in Examples 1 - 4 and Comparative Examples 1 - 4

[0111]

[0112]

[0113] Table 2 Ratios of the PET Fiber Mesh Cloth Layers in Examples 5 - 8 and Comparative Examples 5 - 7

[0114] Component / Quantity Example 5 Example 6 Example 7 Example 8 Comparative Example 5 Comparative Example 6 Comparative Example 7 PET resin 75 75 75 75 75 75 75 Magnesium hydroxide 5 10 10 20 10 0 0 Graphene oxide 0.1 0.25 0.5 1 0 0.5 0 Crosslinking agent 0.5 0.5 0.5 0.5 0.5 0.5 0 PE wax 1 1 1 1 1 1 1 Antioxidant 1 1 1 1 1 1 1

[0115] Performance Test

[0116] In this application, through the composite combination of the TPO layer and the fiber mesh cloth layer, the technical effects of improving the mechanical properties, flame retardant properties, and light stability of the overall product of the exposed flame-retardant and melt-drop resistant TPO waterproof coil are achieved. The light stability differences of the exposed flame-retardant and melt-drop resistant TPO waterproof coils in different examples and comparative examples are measured by the elongation retention rate (elongation retention) of the mechanical properties of the samples of the exposed flame-retardant and melt-drop resistant TPO waterproof coil after UV treatment. The flame retardant properties are characterized by the temperature corresponding to 5% weight loss (T5%), the time required for the burning drips to ignite the filter paper, and the percentage of residual carbon at 600°C (C 600℃ )

[0117] 1. Mechanical Property Test

[0118] The mechanical property test of the samples of the exposed flame-retardant and melt-drop resistant TPO waterproof coil is carried out in accordance with GB / T 27789 - 2011. The test items include the maximum tensile force, the elongation at the maximum tensile force, and the elongation retention rate.

[0119] Steps of UV treatment: Put the samples of the exposed flame-retardant and melt-drop resistant TPO waterproof coil into a xenon arc lamp aging tester meeting the requirements of GB / T 16422.2, with an irradiation intensity of (60 ± 2) W / m 2(300 nm to 400 nm), the black label temperature is (65 ± 3) °C, and it is sprayed for 18 minutes every 2 hours while being irradiated with light. The cumulative irradiation time of the exposed flame-retardant and anti-melting-drop TPO waterproofing membrane samples during UV treatment is 14 days. After taking them out, they are placed in a room at (23 ± 2) °C for 24 hours, and then the performance tests of various items of the mechanical properties of the exposed flame-retardant and anti-melting-drop TPO waterproofing membrane samples after UV treatment are carried out in accordance with the relevant standards of GB / T 27789-2011. Among them, the maximum tensile force and the maximum tensile elongation are both tested before UV treatment, and the elongation retention rate is tested after UV treatment.

[0120] 2. Flame Retardancy Test

[0121] The initial thermal degradation temperature, that is, the temperature corresponding to a 5% weight loss (T5%), and the percentage of residual carbon are both characterized by thermogravimetric tests. The test gas atmosphere is air, the heating rate is 10 K / min, and the test temperature range is from room temperature to 600 °C.

[0122] The time required for the burning drips to ignite the filter paper is observed and characterized through a flammability test furnace, and the detection is carried out in accordance with the standard GB / T 8626-2007, and the ignition time is 30 s.

[0123] 3. Melt Flow Rate (MFR) Test

[0124] It is carried out in accordance with GB / T 3682-2000, and the tests are carried out on the TPO layer and the fiber mesh layer respectively. Therefore, the MFR data in Table 3 correspond to the MFR test data of the TPO layer and the fiber mesh layer in the waterproofing membrane respectively, that is, the MFR values of Examples 1-4 and Comparative Examples 1-4 are the MFR values of the TPO layer, and the MFR values of Examples 5-8 and Comparative Examples 5-7 are the MFR values of the micro mesh layer. The conditions for the melt flow rate (MFR) test are 230 °C and an experiment is carried out with a 2.16 kg weight. Among them, the larger the melt flow rate, the worse the anti-melting-drop performance, and the smaller the melt flow rate, the better the anti-melting-drop performance.

[0125] Table 3 Test Results of Exposed Flame-Retardant and Anti-Melting-Drop TPO Waterproofing Membranes of Examples 1 to 8 and Comparative Examples 1 to 7

[0126]

[0127] Note: In Table 3, "--" indicates that the performance test of this item has not been carried out.

[0128] The test analysis results are divided into three parts. First is the influence of the change in the single TPO layer on the overall performance of the exposed flame-retardant and melt-drop resistant TPO waterproof coil; second is the influence of the change in the fiber mesh layer on the overall performance of the exposed flame-retardant and melt-drop resistant TPO waterproof coil; third is to preferably select the best TPO layer and fiber mesh layer as examples for combination and compare with the other two samples.

[0129] TPO layer part

[0130] Graphene oxide (GO) and magnesium hydroxide (Mg(OH) 2 ) are used as inorganic fillers and have flame-retardant effects at the same time. Therefore, as can be seen from the performance test results of Examples 1 to 4 and Comparative Examples 1 to 4 in Table 3: as the addition amounts of graphene oxide (GO) and Mg(OH) 2 in Examples 1 to 4 increase, the maximum tensile strength, elongation retention rate and flame-retardant performance of the exposed flame-retardant and melt-drop resistant TPO waterproof coil are continuously improved, while the maximum tensile elongation rate is continuously decreasing. The flame-retardant performance is also improved. Among them, the flame-retardant performance and melt-drop resistant performance characterized by T 5％ , C 600℃ , the time required for the burning drips to ignite the filter paper, the melt index, etc. are all improved.

[0131] Compared with Comparative Example 4, although Example 2 has a lower content of graphene oxide (GO) added, by using the method of melt blending and grafting polymers, a TPO functional masterbatch containing graphene oxide (GO) grafted polymer is prepared, which can ensure better dispersion of GO in the TPO layer, and thus obtain better modification effects, making the exposed flame-retardant and melt-drop resistant TPO waterproof coil perform better in terms of mechanical properties, light stability and flame-retardant performance.

[0132] In terms of the exposed performance of the exposed flame-retardant and melt-drop resistant TPO waterproof coil, although the addition amounts of the light stabilizer in the TPO layer formulations of Example 2 and Example 3 are the same, and the amount of graphene oxide (GO) in Example 3 is slightly more, and graphene oxide (GO) has a good capture effect on the free radicals generated by the photo-degraded waterproof coil, and at the same time has the effects of absorbing and reflecting UV light. Therefore, graphene oxide (GO) can act as a "secondary light stabilizer", thereby effectively improving the overall light stability of the exposed flame-retardant and melt-drop resistant TPO waterproof coil when exposed. Therefore, the elongation retention rate of the mechanical properties of the exposed flame-retardant and melt-drop resistant TPO waterproof coil in Example 3 is higher than that of the exposed flame-retardant and melt-drop resistant TPO waterproof coil in Example 2, proving that its light stability is better than that of the exposed flame-retardant and melt-drop resistant TPO waterproof coil in Example 2.

[0133] In terms of the flame retardancy and anti - dripping properties of the exposed flame - retardant and anti - dripping TPO waterproofing membrane, it can be seen that although the addition amount of graphene oxide (GO) in Example 3 is more than that in Example 2, compared with the combined addition amount of magnesium hydroxide, the comprehensive flame - retardant performance of the exposed flame - retardant and anti - dripping TPO waterproofing membrane in Example 2 is better than that of the exposed flame - retardant and anti - dripping TPO waterproofing membrane in Example 3.

[0134] Compared with Comparative Example 1, the flame retardancy and properties such as photo - aging of the exposed flame - retardant and anti - dripping TPO waterproofing membrane in Example 2 are significantly better, proving that the addition of graphene oxide (GO) can significantly improve the exposed flame - retardant and anti - dripping TPO waterproofing membrane in these two key properties. The flame - retardant component of the exposed flame - retardant and anti - dripping TPO waterproofing membrane in Comparative Example 2 does not contain magnesium hydroxide and the TPO masterbatch does not contain graphene oxide, and the exposed flame - retardant and anti - dripping TPO waterproofing membrane in Comparative Example 3 does not contain a flame - retardant component, that is, the flame - retardant component does not contain magnesium hydroxide and the TPO functional masterbatch, and its mechanical properties and flame - retardant properties both decline. Compared with Comparative Example 2 and Comparative Example 3, the performance test results of Examples 1 - 4 prove that only when magnesium hydroxide and graphene oxide (GO) co - exist and there is a synergistic effect between them can the best modification of the flame - retardant performance and anti - dripping performance of the exposed flame - retardant and anti - dripping TPO waterproofing membrane samples be achieved.

[0135] By comparing the performance test results of Examples 1 - 4 and Comparative Examples 1 - 4 of the TPO layer, it can be seen that although the exposed flame - retardant and anti - dripping TPO waterproofing membrane in Example 3 has an advantage in light stability and better flexibility than that in Example 2. However, the exposed flame - retardant and anti - dripping TPO waterproofing membrane in Example 2 meets the requirements of the national standard GB / T 27789 - 2011 in terms of physical and mechanical properties, and the mechanical property gap with the exposed flame - retardant and anti - dripping TPO waterproofing membrane in Example 3 is not very obvious, but it has an advantage in terms of flame - retardant performance and anti - dripping and other safety properties. Moreover, the addition of graphene oxide (GO) in the exposed flame - retardant and anti - dripping TPO waterproofing membrane in Example 3 is more, resulting in a higher cost increase for the exposed flame - retardant and anti - dripping TPO waterproofing membrane in Example 3 than the cost increase of magnesium hydroxide in Example 2, and the overall formulation cost is higher. Therefore, through comprehensive comparison, the best example of the TPO layer is Example 2.

[0136] Fiber grid cloth layer part

[0137] By comparing the composition of the fiber mesh cloth layer in Examples 5 to 8 in Table 2 with the corresponding performance test results in Table 3, it can be seen that: when the components and their contents in the TPO layer remain unchanged, as the contents of magnesium hydroxide and graphene oxide increase, the fiber mesh cloth layer provides greater strength to the overall sample of the exposed flame-retardant and anti-melting-drop TPO waterproofing membrane, the overall tensile strength becomes stronger and stronger, and the elongation rate decreases accordingly.

[0138] Since the determining factor for light stability lies in the TPO layer, the light stability of the exposed flame-retardant and anti-melting-drop TPO waterproofing membrane will not be discussed in this part, and its data is the same as that in Example 1.

[0139] As the contents of magnesium hydroxide and graphene oxide increase, the flame-retardant performance of the overall sample of the exposed flame-retardant and anti-melting-drop TPO waterproofing membrane gradually enhances. Compared with Comparative Examples 5 to 7, in the fiber mesh cloth layer of the exposed flame-retardant and anti-melting-drop TPO waterproofing membrane in Example 7, both magnesium hydroxide and graphene oxide are present, and there is a cross-linking agent. These two can be fixed in the microstructure of the PET fiber mesh cloth layer under the action of the cross-linking agent, thereby fully exerting the synergistic flame-retardant effect and the effect of reducing the mobility of the PET molecular chain, effectively improving the flame-retardant and anti-melting-drop performance of the fiber mesh cloth layer and the overall exposed flame-retardant and anti-melting-drop TPO waterproofing membrane. Therefore, the flame-retardant performance of the exposed flame-retardant and anti-melting-drop TPO waterproofing membrane can be effectively improved. It can also be seen from the test data of MFR that the anti-melting-drop effect of the fiber mesh cloth layer in Example 7 is better than that of the fiber mesh cloth layers in Comparative Examples 5 to 7, proving that the method of adding magnesium hydroxide and graphene oxide to the PET fiber mesh cloth layer formula and under the action of the cross-linking agent can fully exert the effects in improving the flame-retardant performance and anti-melting-drop performance. Through comparison of the data, it can be seen that although the exposed flame-retardant and anti-melting-drop TPO waterproofing membrane in Example 8 is better in terms of flame-retardant performance, anti-melting-drop, etc., its physical and mechanical properties have significantly deteriorated compared with the exposed flame-retardant and anti-melting-drop TPO waterproofing membrane in Example 7. Therefore, the fiber mesh cloth layer in Example 7 is selected as the best choice in this part.

[0140] In order to further verify the influence of the composite of the TPO layer and the fiber mesh cloth layer on the overall performance of the exposed flame-retardant and melt-drop resistant TPO waterproof coil. The TPO layer of Example 2 and the fiber mesh cloth layer of Example 7 were used to prepare corresponding samples of the exposed flame-retardant and melt-drop resistant TPO waterproof coil. It can be seen from the performance test results in Table 3 that the overall mechanical properties of the samples of the exposed flame-retardant and melt-drop resistant TPO waterproof coil are better, but the elongation at break decreases; there is an obvious improvement in the flame-retardant performance and the melt-drop resistant performance compared with the exposed flame-retardant and melt-drop resistant TPO waterproof coil of Example 2, which proves that the corresponding samples of the exposed flame-retardant and melt-drop resistant TPO waterproof coil prepared by using the fiber mesh cloth with the best formula and the best TPO layer formula can effectively improve the flame-retardant and melt-drop resistant performance of the samples, and the thermal stability of the overall exposed flame-retardant and melt-drop resistant TPO waterproof coil is also improved, which is also helpful for the service life of the exposed flame-retardant and melt-drop resistant TPO waterproof coil serving under long-term high temperature and light conditions outdoors.

[0141] As described above, only the specific embodiments of the present application are provided. Those skilled in the art can clearly understand that for the convenience and brevity of description, the specific working process described above can refer to the corresponding process in the foregoing method embodiments and will not be repeated here. It should be understood that the protection scope of the present application is not limited thereto. Any person skilled in the art can easily think of various equivalent modifications or substitutions within the technical scope disclosed in the present application, and these modifications or substitutions should all be covered within the protection scope of the present application.

Claims

1. An exposed flame retardant and anti-drip TPO waterproof membrane, characterized in that: include: A fiber mesh cloth layer, and a TPO layer disposed on both sides of the fiber mesh cloth layer to cover the fiber mesh cloth layer; wherein, In parts by weight, the TPO layer comprises the following components: TPO elastomer, 60-80 parts; Compatibilizer, 1 to 5 parts; Flame retardant component, 3 to 30 parts; the flame retardant component includes a flame retardant and a TPO functional masterbatch, and the mass ratio of the flame retardant to the TPO functional masterbatch is (1 to 5):1; wherein the raw materials of the TPO functional masterbatch include thermoplastic polyolefin, maleic anhydride, crosslinking agent, and graphene oxide in a mass ratio of 1:(0.01 to 0.03):(0.0025 to 0.0075):(0.025 to 0.15), the flame retardant includes a main flame retardant, and the flame retardant uses magnesium hydroxide as the main flame retardant; Antioxidant, 0.1-1 part; Light stabilizer, 2-5 parts; Masterbatch, 1 to 4 parts; The fiber mesh cloth layer comprises the following components in parts by weight: PET resin, 60-80 parts; Magnesium hydroxide, 5-20 parts; Graphene oxide, 0.1-1 part; Cross-linking agent, 0.2-1 part; PE wax, 0.5-2 parts; Antioxidant, 0.1-0.5 parts.

2. The exposed flame-retardant and anti-drip TPO waterproof membrane according to claim 1, characterized in that: The TPO elastomer is selected from Basel CA10A, Basel CA60A, Dow 2300, ExxonMobil 3020, ExxonMobil 3000 or a combination thereof.

3. The exposed flame-retardant and anti-drip TPO waterproof membrane according to claim 1, characterized in that: The flame retardant further comprises an auxiliary flame retardant, wherein the auxiliary flame retardant is one or more of an organic silicon flame retardant, piperazine pyrophosphate, and antimony trioxide.

4. The exposed flame-retardant and anti-drip TPO waterproof membrane according to claim 3, characterized in that: The particle size of the magnesium hydroxide must satisfy: 50 ≤1.7μm, D 90 ≤3.5μm; The mass ratio of the main flame retardant to the auxiliary flame retardant is (7-10):1; The organic silicon flame retardant is selected from SFR 100 halogen-free silicon flame retardant, silicon-based halogen-free transparent liquid flame retardant, transparent silicone flame retardant or a combination thereof.

5. The exposed flame-retardant and anti-drip TPO waterproof membrane according to any one of claims 1 to 4, characterized in that: The light stabilizer is selected from 2020, UV-234, UV-238, 770 or a combination thereof; The compatibilizer is selected from PP-g-MAH, PP-g-GMA, PP-g-PHEMA, POE-g-MAH, PE-g-MAH or a combination thereof.

6. The exposed flame-retardant and anti-drip TPO waterproof membrane according to any one of claims 1 to 4, characterized in that: The crosslinking agent is selected from dicumyl peroxide, dibenzoyl peroxide, di(tert-butylperoxyisopropyl)benzene or a combination thereof.

7. The exposed flame-retardant and anti-drip TPO waterproof membrane according to any one of claims 1 to 4, characterized in that: The requirements for graphene oxide are: 50 7μm~12μm, 1~3 layers; The monolayer ratio of the graphene oxide is greater than 80%.

8. The exposed flame-retardant and anti-drip TPO waterproof membrane according to any one of claims 1 to 4, characterized in that: The PET resin is selected from DuPont 415HP, Shanghai Yuanfang-CH-610, Shanghai Yuanfang-CB-608S, China Resources Chemical CR8816 or a combination thereof; The antioxidant is selected from antioxidants 1010, 168, 1076, 246 or a combination thereof; The PE wax is selected from PE wax having a softening point of 100°C to 115°C.

9. The exposed flame-retardant and anti-drip TPO waterproof membrane according to any one of claims 1 to 4, characterized in that: The fiber mesh fabric layer has a grammage of 100 g / m 2 ~150g / m 2 The minimum cell size is 5mm×5mm~9mm×9mm.

10. A method for preparing the exposed flame-retardant and anti-drip TPO waterproofing membrane according to any one of claims 1 to 9, characterized in that: include: Provide TPO layer; Providing a fiber mesh cloth layer; Covering one side surface of the fiber mesh cloth layer with a TPO layer and compounding the layer with the TPO layer to obtain a first composite layer; In the first composite layer, the side of the fiber mesh cloth layer facing away from the TPO layer covers another TPO layer, so as to obtain an exposed flame-retardant and anti-melting dripping TPO waterproof coiled material.

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