An ultrahigh weather-resistant layer and a TPO waterproof roll material and a preparation method thereof

Abstract

The application belongs to the field of waterproof materials, and discloses an ultrahigh weather-resistant layer, a TPO waterproof coiled material and a preparation method.The material of the ultrahigh weather-resistant layer comprises the following components: polyester resin, an additive, titanium white and a filler.The acid value of the polyester resin is 30-40 mg KOH / g, the softening point is 100-115 DEG C, the resin viscosity is 3200-4000 mPa s, and the glass transition temperature is 50-65 DEG C.The application provides an ultrahigh weather-resistant layer with excellent weather resistance, which can provide stronger weather resistance for the waterproof coiled material and improve the service life of the waterproof coiled material.

Description

Technical Field

[0001] This invention belongs to the field of waterproof materials, and more specifically, relates to an ultra-high weather resistance layer and a TPO waterproof membrane and its preparation method. Background Technology

[0002] Industrial building roofs are exposed to wind, sun, and rain year-round, placing higher demands on waterproofing materials. In recent years, thermoplastic polyolefin (TPO) waterproof membranes have gradually become mainstream in the industrial building roof waterproofing field due to their good low-temperature performance, weldability, high joint peel strength, corrosion resistance, and root penetration resistance. Their advanced manufacturing processes are also leading the industry's progress. Although their weather resistance is superior to traditional materials, it still declines significantly with age and environmental changes. Furthermore, the decorative potential of TPO roofing currently lies mainly in the different colors of the upper surface layer, offering limited variability. Moreover, color changes during production require more materials, resulting in waste of raw materials and energy. Summary of the Invention

[0003] The purpose of this invention is to address the shortcomings of existing technologies by providing an ultra-high weather resistance layer, a TPO waterproof membrane, and a method for its preparation. This invention provides an ultra-high weather resistance layer with excellent weather resistance, which can provide stronger weather resistance to waterproof membranes and extend their service life.

[0004] To achieve the above objectives, the first aspect of the present invention provides an ultra-high weather resistance layer, wherein the material of the ultra-high weather resistance layer comprises the following components: polyester resin, additives, titanium dioxide and fillers;

[0005] The polyester resin has an acid value of 30-40 mg KOH / g, a softening point of 100-115℃, a resin viscosity of 3200-4000 mPa·s, and a glass transition temperature of 50-65℃.

[0006] In this invention, the polyester resin is the main substrate of the ultra-high weather resistance layer. The polyester resin with the above-mentioned indicators (acid value, softening point, resin viscosity, glass transition temperature) can be cured at a low temperature of 140-160℃. This temperature can coincide with the extrusion temperature range of waterproof membrane production. Therefore, the ultra-high weather resistance layer of this invention can form a dense bond with the waterproof membrane.

[0007] According to the present invention, preferably, based on the total weight of the ultra-high weather resistance layer, the content of the polyester resin is 50-60%, the content of the additives is 0.5-12%, the content of titanium dioxide is 15-20%, and the content of the filler is 20-25%.

[0008] According to the present invention, preferably, the thickness of the ultra-high weather resistance layer is 0.15-0.25 mm.

[0009] According to the present invention, preferably, the polyester resin is prepared by double bond copolymerization;

[0010] According to the present invention, preferably, based on the total weight of the ultra-high weather resistance layer, the additives include: 4-8% curing agent, 0.5-1% first light stabilizer, 0.5-1% first antioxidant, 0.5-0.8% coupling agent, and 0.5-1% leveling agent.

[0011] In this invention, the coupling agent functions as a dispersant.

[0012] In this invention, the leveling agent can make the surface of the ultra-high weather resistance layer full and free of orange peel texture.

[0013] According to the present invention, preferably, the filler is heavy calcium carbonate with a particle size of 2000-2500 mesh.

[0014] The second aspect of the present invention provides a TPO waterproof membrane, the waterproof membrane comprising, from top to bottom, a decorative layer, an ultra-high weather resistance layer, a low-temperature resistant top layer, a first main material layer, and a low-temperature resistant bottom layer;

[0015] The ultra-high weather resistance layer is the ultra-high weather resistance layer mentioned above.

[0016] According to the present invention, preferably, based on the total weight of the low-temperature resistant top layer or the low-temperature resistant bottom layer, the materials of the low-temperature resistant top layer and the low-temperature resistant bottom layer each independently comprise: 50-60% of a first TPO resin, 10-25% of a POE resin, 5-15% of an impact-resistant polypropylene resin, 10-18% of a first inorganic filler, 0.3-0.6% of a second antioxidant, and 0.4-0.6% of a second light stabilizer.

[0017] According to the present invention, preferably, the thickness of the low-temperature resistant top layer and the low-temperature resistant bottom layer is independently 0.14-0.16 mm.

[0018] According to the present invention, preferably, the material of the decorative layer is photochromic pigment powder particles; the thickness of the decorative layer is 0.08-0.12 mm.

[0019] In this invention, the TPO waterproof membrane incorporates photochromic pigment powder particles, which can display different colors according to changes in light intensity, enriching decorative possibilities. Therefore, this invention produces a highly weather-resistant thermoplastic polyolefin (TPO) waterproof membrane for roofing with a customizable photochromic surface decoration. This invention extends the service life of the waterproof membrane while allowing for the creation of corresponding photochromic patterns according to user needs. It provides durable and safe waterproofing for industrial buildings and facilitates market expansion through its flexible decorative properties.

[0020] According to the present invention, preferably, a glass fiber layer and a second main material layer are further disposed sequentially between the first main material layer and the low-temperature resistant bottom layer.

[0021] According to the present invention, preferably, based on the total weight of the first main material layer or the second main material layer, the materials of the first main material layer and the second main material layer each independently comprise: 70-80% of the second TPO resin, 15-20% of the second inorganic filler, 0.3-0.6% of the third antioxidant, and 0.4-0.6% of the third light stabilizer.

[0022] According to the present invention, preferably, the thickness of the first main material layer and the second main material layer is independently 0.55-0.65 mm.

[0023] According to the present invention, preferably, the glass fiber basis weight of the glass fiber layer is 70-80 g / m². 2 The thickness is 0.1-0.3mm.

[0024] In this invention, the glass fiber layer can improve the dimensional stability of the TPO waterproof membrane.

[0025] According to the present invention, preferably, a non-woven fabric layer is disposed below the low-temperature resistant bottom layer.

[0026] According to the present invention, preferably, the basis weight of the nonwoven fabric layer is 100-120 g / m². 2 The thickness is 0.35-0.45mm.

[0027] A third aspect of the present invention provides a method for preparing the aforementioned TPO waterproof membrane, the method comprising the following steps:

[0028] S1: The material of the low-temperature resistant bottom layer is extruded and fed into the first calender for calendering. After being cooled and shaped by the cooling roller group, the low-temperature resistant bottom layer is obtained and fed into the second calender.

[0029] S2: The material of the low-temperature resistant top layer and the material of the first main material layer are extruded and then fed into the second calender;

[0030] S3: The material of the ultra-high weather resistance layer is sequentially subjected to extrusion, cooling and shaping by a tablet press, crushing and screening to obtain ultra-high weather resistance particles; the ultra-high weather resistance particles are sprayed onto the upper surface of the low-temperature resistant top layer to be calendered in the second calender, and the layers in the second calender are composite calendered to obtain the ultra-high weather resistance layer;

[0031] S4: The material of the decorative layer is sprayed onto the upper surface of the ultra-high weather resistance layer, and then subjected to composite calendering. After cooling and shaping by the cooling roller group, the material is corrected and metered and wound up to obtain the TPO waterproof membrane.

[0032] In this invention, the "spraying" process further enhances the weather resistance of the prepared TPO waterproof membrane and provides more decorative options.

[0033] According to the present invention, preferably, in step S3:

[0034] The equipment used for extrusion includes twin-screw extruders with a length-to-diameter ratio of (14-18):1;

[0035] The extrusion temperature is 100-120℃;

[0036] The tablet press is a stainless steel cooled tablet press;

[0037] The equipment used for crushing is a crusher, and the crusher rotates at a speed of 2000-3000 rpm;

[0038] The particle size of the ultra-high weather-resistant particles is 35-45 μm;

[0039] The pressing force of the composite calendering is 9-13KN.

[0040] According to the present invention, preferably, in step S4, the pressing force of the composite calendering is 3-7 KN.

[0041] In this invention, as a preferred embodiment, the first calender and the second calender are each independently a three-roll calender.

[0042] In this invention, when a glass fiber layer and a second main material layer are sequentially disposed between the first main material layer and the low-temperature resistant bottom layer, the method includes:

[0043] (1): The glass fiber layer is unwound from the unwinding equipment, passes through the flattening equipment and the correction device, and is tension controlled to be sent to the first three-roll calender in a flat and centered shape.

[0044] The materials of the low-temperature resistant bottom layer and the second main material layer are extruded and fed into the first co-extrusion mold respectively.

[0045] The low-temperature resistant bottom layer and the main material layer are extruded from the first co-extrusion die to the space between the lower and middle rolls of the first three-roll calender, and are combined with the glass fiber layer under a pressure of 8-10KN. After cooling and shaping by the cooling roller group, tension control and correction device centering, a three-layer structure is obtained, which together travel to the second three-roll calender.

[0046] (2): The material of the low temperature resistant top layer and the material of the first main material layer are extruded separately and then extruded together through the second co-extrusion die to the space between the lower roll and the middle roll of the second three-roll calender;

[0047] (3): The material of the ultra-high weather resistance layer is sequentially subjected to extrusion, cooling and shaping by a tablet press, crushing and screening to obtain ultra-high weather resistance particles; the ultra-high weather resistance particles are sprayed onto the upper surface of the low-temperature resistant top layer to be calendered in the second and third roll calender, and the layers in the second and third roll calender are composite calendered to obtain the ultra-high weather resistance layer;

[0048] (4): The material of the decorative layer is sprayed onto the upper surface of the ultra-high weather resistance layer, and then composite calendered again. After cooling and shaping by the cooling roller group, correction and metering winding are performed to obtain the TPO waterproof membrane.

[0049] In this invention, when a nonwoven fabric layer is disposed beneath the low-temperature resistant bottom layer, the method includes:

[0050] a: The nonwoven fabric layer is unwound from the unwinding equipment, passes through the flattening equipment and the correction device, and is tension controlled to reach the first three-roll calender in a flat and centered shape.

[0051] After the low-temperature resistant bottom layer material is extruded, it is fed between the lower and middle rolls of the first three-roll calender and bonded with the non-woven fabric layer with a pressure of 3-5KN. After cooling and shaping by the cooling roller group, tension control and correction device correction and centering, two structural layers are obtained and together they are sent to the second three-roll calender.

[0052] The subsequent steps are the same as (2)-(4).

[0053] The beneficial effects of the technical solution of the present invention are as follows:

[0054] This invention addresses the weather resistance issue of thermoplastic polyolefin (TPO) waterproof membranes used in roofing by providing an ultra-high weather resistance layer with excellent weather resistance, which can enhance the weather resistance of the waterproof membrane and extend its service life.

[0055] The TPO waterproof membrane obtained by this invention can be used on industrial building roofs, providing a durable and safe waterproof effect for industrial buildings.

[0056] Other features and advantages of the present invention will be described in detail in the following detailed description section. Attached Figure Description

[0057] The above and other objects, features and advantages of the present invention will become more apparent from the more detailed description of exemplary embodiments of the invention in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same components in the exemplary embodiments of the invention.

[0058] Figure 1 A schematic diagram of a TPO waterproof membrane (reinforced TPO waterproof membrane) provided in Embodiment 1 of the present invention is shown.

[0059] Figure 2 A schematic diagram of a TPO waterproof membrane (backed TPO waterproof membrane) provided in Embodiment 2 of the present invention is shown.

[0060] Figure 3 A schematic diagram of a TPO waterproof membrane (homogeneous TPO waterproof membrane) provided in Embodiment 3 of the present invention is shown.

[0061] The annotations in the attached figures are explained as follows:

[0062] Decorative layer 1, ultra-high weather resistance layer 2, low temperature resistant top layer 3, first main material layer 4, fiberglass layer 5, second main material layer 6, low temperature resistant bottom layer 7, non-woven fabric layer 8. Detailed Implementation

[0063] Preferred embodiments of the invention will now be described in more detail. While preferred embodiments of the invention are described below, it should be understood that the invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that the invention will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

[0064] In the following embodiments:

[0065] The curing agent is triglycidyl isocyanurate;

[0066] The first, second, and third light stabilizers are all selected from high molecular weight hindered amine light stabilizers, such as BASF Chimassorb 2020.

[0067] The first antioxidant is BASF 1010;

[0068] The coupling agent is selected from titanate coupling agents;

[0069] The leveling agent used is acrylic L88 type leveling agent;

[0070] The titanium dioxide used is DuPont R105 titanium dioxide.

[0071] The filler used is Omia 2T-JI, and the high-mesh heavy calcium carbonate can improve the stability of the weather-resistant layer.

[0072] The photochromic pigment powder particles are selected from Shengse Technology's PM series.

[0073] Both the first TPO resin and the second TPO resin are Basel CA 10A.

[0074] The POE resin used is Dow ENGAGE 8150. POE with a low glass transition temperature can greatly improve the low-temperature performance of the roll material.

[0075] The impact-resistant polypropylene resin selected is Sinopec NS20, which can compensate for the strength reduction caused by the addition of POE resin, so that the roll material has both good low-temperature performance and toughness, and can also maintain the excellent strength of the roll material.

[0076] Both the first and second inorganic fillers are selected from Albemarle magnesium hydroxide H5, which can improve the stability of the roll material and increase its flame retardant properties.

[0077] Both the second and third antioxidants are BASF B225;

[0078] The nonwoven fabric layer is made of Tiandingfeng short fiber nonwoven fabric.

[0079] Example 1

[0080] This embodiment provides an ultra-high weather resistance layer. Based on the total weight of the ultra-high weather resistance layer, the material of the ultra-high weather resistance layer includes the following components: 55% polyester resin, 4% curing agent, 1% first light stabilizer, 1% first antioxidant, 0.5% coupling agent, 0.5% leveling agent, 16% titanium dioxide, and 22% filler.

[0081] The polyester resin is prepared by double bond copolymerization, with an acid value of 35-38 mg KOH / g, a softening point of 105-110℃, a resin viscosity of 3400-3500 mPa·s, and a glass transition temperature of 55-60℃.

[0082] This embodiment also provides a TPO waterproof membrane (reinforced TPO waterproof membrane), such as Figure 1 As shown, the waterproof membrane includes, from top to bottom, a decorative layer 1, an ultra-high weather resistance layer 2, a low-temperature resistant top layer 3, a first main material layer 4, a fiberglass layer 5, a second main material layer 6, and a low-temperature resistant bottom layer 7.

[0083] The ultra-high weather resistance layer 2 is the ultra-high weather resistance layer mentioned above.

[0084] The decorative layer 1 has a thickness of 0.1 mm, the ultra-high weather resistance layer 2 has a thickness of 0.2 mm, the low-temperature resistant top layer 3 has a thickness of 0.15 mm, the first main material layer 4 has a thickness of 0.6 mm, and the glass fiber layer 5 has a glass fiber basis weight of 75 g / m². 2 The thickness of the first layer is 0.2 mm, the thickness of the second main material layer 6 is 0.6 mm, and the thickness of the low-temperature resistant bottom layer 7 is 0.15 mm.

[0085] The low-temperature resistant top layer and the low-temperature resistant bottom layer have the same formulation. Based on the total weight of the low-temperature resistant top layer, the materials of the low-temperature resistant top layer and the low-temperature resistant bottom layer each independently include: 52% of the first TPO resin, 21% of the POE resin, 8% of the impact-resistant polypropylene resin, 17.8% of the first inorganic filler, 0.6% of the second antioxidant, and 0.6% of the second light stabilizer.

[0086] The formulations of the first main material layer and the second main material layer are the same. Based on the total weight of the first main material layer, the materials of the first main material layer and the second main material layer each independently include: 80% of the second TPO resin, 19% of the second inorganic filler, 0.5% of the third antioxidant, and 0.5% of the third light stabilizer.

[0087] The above-mentioned preparation method of TPO waterproof membrane includes:

[0088] Equipment requirements:

[0089] The production process requires a total of 5 twin-screw extruders, 2 double-layer co-extrusion dies, 2 sets of three-roll calenders, 1 stainless steel strip cooling and pressing machine, 1 crusher, 1 centrifugal screening machine, 2 sets of cooling rollers, 5 sets of tension controllers, 1 unwinding device, 1 flattening device, 3 correction devices, 1 storage device, and 1 metering and winding device.

[0090] Raw material preparation:

[0091] Mix the auxiliary raw materials in the corresponding proportion in the high-speed mixer for 5-10 minutes, with the frequency controlled at 25-35Hz; monitor the material temperature with an infrared thermometer, ensuring it does not exceed 45℃ to prevent sticking; after mixing, add the mixture to the weighing scale above the extruder.

[0092] Other resin raw materials are added to the corresponding weighing scales, and the main unit sets the parameters of each weighing scale according to the formula and feeds them into the twin-screw extruder intermittently according to the production sequence.

[0093] Extrusion molding:

[0094] The glass fiber layer is unwound from the unwinding equipment, passes through the flattening equipment and the correction device, and is tension controlled to travel to the first three-roll calender in a flat and centered shape.

[0095] The low-temperature resistant bottom layer is extruded by a twin-screw extruder with a length-to-diameter ratio of 40:1. The extruder temperature is set at 170-190℃, and the material enters the first co-extrusion die in a molten state.

[0096] The second main material layer is extruded by a twin-screw extruder with a length-to-diameter ratio of 40:1. The extruder temperature is set at 180-200℃, and the material enters the first co-extrusion die in a molten state.

[0097] The low-temperature resistant bottom layer and the second main material layer are extruded from the first co-extrusion die to the space between the lower and middle rolls of the first three-roll calender. They are then bonded with the glass fiber layer under a pressure of 8-10KN. After being cooled and shaped by the cooling roller group, and centered by tension control and the correction device, a three-layer structure is obtained and then sent to the second three-roll calender.

[0098] The first main material layer is extruded by a twin-screw extruder with a length-to-diameter ratio of 40:1. The extruder temperature is set at 180-200℃, and the material enters the second co-extrusion die in a molten state.

[0099] The low-temperature resistant top layer is extruded by a twin-screw extruder with a length-to-diameter ratio of 40:1. The extruder temperature is set at 170-190℃, and the material enters the second co-extrusion die in a molten state.

[0100] The low-temperature resistant top layer and the first main material layer are extruded from the second co-extrusion die between the lower roll and the middle roll of the second three-roll calender.

[0101] The ultra-high weather-resistant layer is extruded from a twin-screw extruder with a length-to-diameter ratio of 16:1. The extruder temperature is set at 100-120℃. The material is extruded from the extruder to a stainless steel cooling and tableting machine for cooling and shaping. It is then crushed at 2500 rpm to form particles with a diameter of 30-50μm. The particles are then separated into 40μm particles by a centrifugal sieve to obtain ultra-high weather-resistant particles. These particles are conveyed by a screw conveyor to the space between the lower and middle rollers of a second and third roller calender. They are then sprayed onto the upper surface of the low-temperature resistant top layer to be calendered in the second and third roller calender. The three structural layers and the low-temperature resistant top layer are then bonded to the first main material layer with a pressure of 10-12KN to obtain the ultra-high weather-resistant layer.

[0102] The photochromic pigment powder particles used in the decorative layer are pushed by a screw conveyor to the space between the middle and upper rolls of the second and third roll calender, sprayed onto the upper surface of the ultra-high weather resistance layer, and then subjected to composite calendering again, embedded into the ultra-high weather resistance layer with a pressing force of 4-6KN.

[0103] The seven-layer composite roll is cooled and shaped by the cooling roller assembly, then passes through the tension control device and the correction system to the storage device, and finally passes through the metering and winding device to obtain the final product TPO waterproof roll.

[0104] Example 2

[0105] This embodiment provides a TPO waterproof membrane (backed TPO waterproof membrane), such as Figure 2 As shown, the waterproof membrane includes, from top to bottom, a decorative layer 1, an ultra-high weather resistance layer 2, a low-temperature resistant top layer 3, a first main material layer 4, a low-temperature resistant bottom layer 7, and a non-woven fabric layer 8.

[0106] The ultra-high weather resistance layer 2 is the ultra-high weather resistance layer of Example 1.

[0107] The decorative layer 1 has a thickness of 0.1 mm, the ultra-high weather resistance layer 2 has a thickness of 0.2 mm, the low-temperature resistant top layer 3 has a thickness of 0.15 mm, the first main material layer 4 has a thickness of 0.6 mm, the low-temperature resistant bottom layer 7 has a thickness of 0.15 mm, and the non-woven fabric layer 8 (with a basis weight of 110 g / m²) has a thickness of 0.1 mm. 2 The thickness is 0.4 mm;

[0108] The formulations of the low-temperature resistant top layer and the low-temperature resistant bottom layer are the same as in Example 1;

[0109] The formulation of the first or second main material layer is the same as that in Example 1.

[0110] The above-mentioned preparation method of TPO waterproof membrane includes:

[0111] Equipment requirements:

[0112] The production process requires a total of 4 twin-screw extruders, 1 double-layer co-extrusion die, 1 single-layer co-extrusion die, 2 sets of three-roll calenders, 1 stainless steel strip cooling and pressing machine, 1 crusher, 1 centrifugal screening machine, 2 sets of cooling rollers, 5 sets of tension controllers, 1 unwinding device, 1 flattening device, 3 correction devices, 1 storage device, and 1 metering and winding device.

[0113] Raw material preparation:

[0114] Mix the auxiliary raw materials in the corresponding proportion in the high-speed mixer for 5-10 minutes, with the frequency controlled at 25-35Hz; monitor the material temperature with an infrared thermometer, ensuring it does not exceed 45℃ to prevent sticking; after mixing, add the mixture to the weighing scale above the extruder.

[0115] Other resin raw materials are added to the corresponding weighing scales, and the main unit sets the parameters of each weighing scale according to the formula and feeds them into the twin-screw extruder intermittently according to the production sequence.

[0116] Extrusion molding:

[0117] The nonwoven fabric layer is unwound from the unwinding equipment, passes through the flattening equipment and the correction device, and is tension controlled to reach the first three-roll calender in a flat and centered shape.

[0118] The low-temperature resistant bottom layer is extruded by a twin-screw extruder with a length-to-diameter ratio of 40:1. The extruder is set to a temperature of 170-190℃. The material enters the first three-roll calender in a molten state between the lower and middle rolls. It is then bonded to the nonwoven fabric layer with a pressure of 3-5KN. After being cooled and shaped by the cooling roller group, tension control and the correction device are used to correct and center the material, resulting in two structural layers. The material then proceeds to the second three-roll calender.

[0119] The first main material layer is extruded by a twin-screw extruder with a length-to-diameter ratio of 40:1. The extruder temperature is set at 180-200°C, and the material enters the co-extrusion die in this embodiment in a molten state.

[0120] The low-temperature resistant top layer is extruded by a twin-screw extruder with a length-to-diameter ratio of 40:1. The extruder temperature is set at 170-190°C, and the material enters the co-extrusion die in this embodiment in a molten state.

[0121] The low-temperature resistant top layer and the first main material layer are extruded from the co-extrusion die of this embodiment between the lower roll and the middle roll of the second three-roll calender.

[0122] The ultra-high weather-resistant layer is extruded from a twin-screw extruder with a length-to-diameter ratio of 16:1. The extruder temperature is set at 100-120℃. The material is extruded from the extruder to a stainless steel cooling and tableting machine for cooling and shaping. It is then crushed at 2500 rpm to form particles with a diameter of 30-50μm. The particles are then separated into 40μm particles by a centrifugal sieve to obtain ultra-high weather-resistant particles. These particles are conveyed by a screw conveyor to the space between the lower and middle rollers of a second and third roller calender. They are then sprayed onto the upper surface of the low-temperature resistant top layer to be calendered in the second and third roller calender. The three structural layers and the low-temperature resistant top layer are then bonded to the first main material layer with a pressure of 10-12KN to obtain the ultra-high weather-resistant layer.

[0123] The photochromic pigment powder particles used in the decorative layer are pushed by a screw conveyor to the space between the middle and upper rolls of the second and third roll calender, sprayed onto the upper surface of the ultra-high weather resistance layer, and then subjected to composite calendering again, embedded into the ultra-high weather resistance layer with a pressing force of 4-6KN.

[0124] The above six-layer composite roll is cooled and shaped by the cooling roller assembly, then passes through the tension control device and the correction system to the storage device, and finally passes through the metering and winding device to obtain the final product TPO waterproof roll.

[0125] Example 3

[0126] This embodiment provides a TPO waterproof membrane (homogeneous TPO waterproof membrane), such as Figure 3 As shown, the waterproof membrane includes, from top to bottom, a decorative layer 1, an ultra-high weather resistance layer 2, a low-temperature resistant top layer 3, a first main material layer 4, and a low-temperature resistant bottom layer 7;

[0127] The ultra-high weather resistance layer 2 is the ultra-high weather resistance layer of Example 1.

[0128] The decorative layer 1 has a thickness of 0.1 mm, the ultra-high weather resistance layer 2 has a thickness of 0.2 mm, the low temperature resistant top layer 3 has a thickness of 0.15 mm, the first main material layer 4 has a thickness of 0.6 mm, and the low temperature resistant bottom layer 7 has a thickness of 0.15 mm.

[0129] The above-mentioned preparation method of TPO waterproof membrane includes:

[0130] Equipment requirements:

[0131] The production process requires a total of 4 twin-screw extruders, 1 double-layer co-extrusion die, 1 single-layer co-extrusion die, 2 sets of three-roll calenders, 1 stainless steel strip cooling and pressing machine, 1 crusher, 1 centrifugal screening machine, 2 sets of cooling rollers, 5 sets of tension controllers, 1 unwinding device, 1 flattening device, 3 correction devices, 1 storage device, and 1 metering and winding device.

[0132] Raw material preparation:

[0133] Mix the auxiliary raw materials in the corresponding proportion in the high-speed mixer for 5-10 minutes, with the frequency controlled at 25-35Hz; monitor the material temperature with an infrared thermometer, ensuring it does not exceed 45℃ to prevent sticking; after mixing, add the mixture to the weighing scale above the extruder.

[0134] Other resin raw materials are added to the corresponding weighing scales, and the main unit sets the parameters of each weighing scale according to the formula and feeds them into the twin-screw extruder intermittently according to the production sequence.

[0135] Extrusion molding:

[0136] The low-temperature resistant bottom layer is extruded by a twin-screw extruder with a length-to-diameter ratio of 40:1. The extruder is set to a temperature of 170-190℃. The material enters the first three-roll calender in a molten state between the lower and middle rolls. After being cooled and shaped by the cooling roll assembly, it is sent to the second three-roll calender.

[0137] The first main material layer is extruded by a twin-screw extruder with a length-to-diameter ratio of 40:1. The extruder temperature is set at 180-200°C, and the material enters the co-extrusion die in this embodiment in a molten state.

[0138] The low-temperature resistant top layer is extruded by a twin-screw extruder with a length-to-diameter ratio of 40:1. The extruder temperature is set at 170-190°C, and the material enters the co-extrusion die in this embodiment in a molten state.

[0139] The low-temperature resistant top layer and the first main material layer are extruded from the co-extrusion die of this embodiment between the lower roll and the middle roll of the second three-roll calender.

[0140] The ultra-high weather-resistant layer is extruded from a twin-screw extruder with a length-to-diameter ratio of 16:1. The extruder temperature is set at 100-120℃. The material is extruded from the extruder to a stainless steel cooling and tableting machine for cooling and shaping. It is then crushed at 2500 rpm to form particles with a diameter of 30-50μm. The particles are then separated into 40μm particles by a centrifugal sieve to obtain ultra-high weather-resistant particles. These particles are conveyed by a screw conveyor to the space between the lower and middle rollers of a second and third roller calender. They are then sprayed onto the upper surface of the low-temperature resistant top layer to be calendered in the second and third roller calender. The three structural layers and the low-temperature resistant top layer are then bonded to the first main material layer with a pressure of 10-12KN to obtain the ultra-high weather-resistant layer.

[0141] The photochromic pigment powder particles used in the decorative layer are pushed by a screw conveyor to the space between the middle and upper rolls of the second and third roll calender, sprayed onto the upper surface of the ultra-high weather resistance layer, and then subjected to composite calendering again, embedded into the ultra-high weather resistance layer with a pressing force of 4-6KN.

[0142] The five-layer composite roll is cooled and shaped by the cooling roller assembly, then passes through the tension control device and the correction system to the storage device, and finally passes through the metering and winding device to obtain the final product TPO waterproof roll.

[0143] Comparative Example 1

[0144] This comparative example provides a TPO waterproof membrane (reinforced TPO waterproof membrane). The only difference between this comparative example and Example 1 is that:

[0145] No ultra-high weather resistance layer 2;

[0146] The thickness of the first main material layer 4 is 0.8 mm;

[0147] The thickness of the second main material layer 6 is 0.8 mm;

[0148] The preparation method of the comparative TPO waterproof membrane differs from that of Example 1 only in that:

[0149] After the low-temperature resistant top layer and the first main material layer are extruded from the second co-extrusion die between the lower and middle rolls of the second three-roll calender, the three-layer structure layer and the low-temperature resistant top layer and the first main material layer are compounded with a pressure of 9-10KN to obtain the ultra-high weather resistance layer.

[0150] The photochromic pigment powder particles used in the decorative layer are pushed by a screw conveyor to the space between the middle and upper rolls of the second and third roll calender, sprayed onto the upper surface of the low-temperature resistant top layer, and then subjected to composite calendering again to embed the ultra-high weather resistance layer with a pressing force of 4-6KN.

[0151] Comparative Example 2

[0152] This comparative example provides a TPO waterproof membrane (reinforced TPO waterproof membrane). The only difference between this comparative example and Example 1 is that:

[0153] The thickness of the ultra-high weather resistance layer 2 is 0.1 mm;

[0154] The thickness of the first main material layer 4 is 0.7 mm;

[0155] The thickness of the second main material layer 6 is 0.7 mm;

[0156] The preparation method of the TPO waterproof membrane in this comparative example is the same as that in Example 1.

[0157] Test case

[0158] This test example tests the performance of the waterproof membrane obtained from the above examples and comparative examples according to the GB 27789-2011 test standard. The results are shown in Table 1.

[0159] Table 1

[0160]

[0161]

[0162]

[0163] As shown in Table 1:

[0164] Compared with Example 1, the ultra-high weather resistance layer can significantly increase the anti-aging performance of TPO waterproof membrane and also maintain its low-temperature resistance for a longer period of time.

[0165] Comparing Example 1 and Comparative Example 2, the thickness of the ultra-high weather resistance layer also affects the anti-aging performance of the TPO waterproof membrane. A thickness of 0.2 mm is more suitable for the use of the membrane. A thickness less than 0.2 mm will reduce the weather resistance of the membrane, while a thickness greater than 0.2 mm will make the membrane stiffer and harder, which is not conducive to construction and use.

[0166] The various embodiments of the present invention have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.

Claims

1. TPO waterproof membrane, characterized in that, The waterproof membrane comprises, from top to bottom, a decorative layer, an ultra-high weather resistance layer, a low-temperature resistant top layer, a first main material layer, and a low-temperature resistant bottom layer; Based on the total weight of the ultra-high weather resistance layer, the content of polyester resin is 50-60%, the content of additives is 0.5-12%, the content of titanium dioxide is 15-20%, and the content of filler is 20-25%. The polyester resin has an acid value of 30-40 mg KOH / g, a softening point of 100-115℃, a resin viscosity of 3200-4000 mPa·s, a glass transition temperature of 50-65℃, and a low-temperature curing temperature of 140-160℃. The polyester resin was prepared by double bond copolymerization. The thickness of the ultra-high weather resistance layer is 0.15-0.25 mm; Based on the total weight of the ultra-high weather resistance layer, the additives include: 4-8% curing agent, 0.5-1% first light stabilizer, 0.5-1% first antioxidant, 0.5-0.8% coupling agent, and 0.5-1% leveling agent; The filler is heavy calcium carbonate with a particle size of 2000-2500 mesh; Based on the total weight of the low-temperature resistant top layer or the low-temperature resistant bottom layer, the materials of the low-temperature resistant top layer and the low-temperature resistant bottom layer each independently comprise: 50-60% of a first TPO resin, 10-25% of a POE resin, 5-15% of an impact-resistant polypropylene resin, 10-18% of a first inorganic filler, 0.3-0.6% of a second antioxidant, and 0.4-0.6% of a second light stabilizer; The thickness of the low-temperature resistant top layer and the low-temperature resistant bottom layer are each independently 0.14-0.16 mm.

2. The TPO waterproof membrane according to claim 1, wherein, The decorative layer is made of photochromic pigment powder particles; the thickness of the decorative layer is 0.08-0.12 mm.

3. The TPO waterproof membrane according to claim 1, wherein, A glass fiber layer and a second main material layer are sequentially disposed between the first main material layer and the low-temperature resistant bottom layer.

4. The TPO waterproof membrane according to claim 3, wherein, Based on the total weight of the first main material layer or the second main material layer, the materials of the first main material layer and the second main material layer each independently include: 70-80% of the second TPO resin, 15-20% of the second inorganic filler, 0.3-0.6% of the third antioxidant and 0.4-0.6% of the third light stabilizer.

5. The TPO waterproof membrane according to claim 3, wherein, The thickness of the first main material layer and the second main material layer are each independently 0.55-0.65 mm.

6. The TPO waterproof membrane according to claim 3, wherein, The glass fiber basis weight of the glass fiber layer is 70-80 g / m². 2 The thickness is 0.1-0.3mm.

7. The TPO waterproof membrane according to claim 1, wherein, A non-woven fabric layer is provided beneath the low-temperature resistant bottom layer.

8. The TPO waterproof membrane according to claim 7, wherein, The nonwoven fabric layer has a basis weight of 100-120 g / m². 2 The thickness is 0.35-0.45mm.

9. A method for preparing the TPO waterproof membrane according to any one of claims 1-8, characterized in that, The preparation method includes the following steps: S1: The material of the low-temperature resistant bottom layer is extruded and fed into the first calender for calendering. After being cooled and shaped by the cooling roller group, the low-temperature resistant bottom layer is obtained and fed into the second calender. S2: The material of the low-temperature resistant top layer and the material of the first main material layer are extruded and then fed into the second calender; S3: The material of the ultra-high weather resistance layer is sequentially subjected to extrusion, cooling and shaping by a tablet press, crushing and screening to obtain ultra-high weather resistance particles; the ultra-high weather resistance particles are sprayed onto the upper surface of the low-temperature resistant top layer to be calendered in the second calender, and the layers in the second calender are composite calendered to obtain the ultra-high weather resistance layer; S4: The material of the decorative layer is sprayed onto the upper surface of the ultra-high weather resistance layer, and then subjected to composite calendering. After cooling and shaping by the cooling roller group, the material is corrected and metered and wound up to obtain the TPO waterproof membrane.

10. The method for preparing TPO waterproof membrane according to claim 9, wherein, In step S3: The equipment used for extrusion includes twin-screw extruders with a length-to-diameter ratio of (14-18):1; The extrusion temperature is 100-120℃; The tablet press is a stainless steel cooled tablet press; The equipment used for crushing is a crusher, and the crusher rotates at a speed of 2000-3000 rpm; The particle size of the ultra-high weather-resistant particles is 35-45 μm; The pressing force of the composite calender is 9-13KN; In step S4, the pressing force of the composite calendering is 3-7KN.

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