A polyolefin waterproof coiled material for a photovoltaic roof and a preparation method thereof

Abstract

The present invention discloses a polyolefin waterproofing membrane for photovoltaic roofing and a method for preparing the same. The polyolefin waterproofing membrane comprises, from bottom to top, a thermal insulation base layer, an intermediate reinforcement layer, and a highly reflective surface layer. The beneficial effects of the present invention are as follows: the polyolefin waterproofing membrane for photovoltaic roofing, through the composite thermal insulation base layer and the highly reflective surface layer, significantly reduces the surface temperature of the polyolefin sheet on the roof, forming a cool roof. The waterproofing membrane also has a simple preparation process, can be produced under normal pressure, and eliminates the discharge of three wastes.

Description

Technical Field

[0001] The present invention belongs to the technical field of building waterproofing, and in particular relates to a polyolefin waterproofing membrane for photovoltaic roofing and a preparation method thereof. Background Art

[0002] As a reflection of China's commitment to transforming its energy structure, distributed photovoltaic power generation has become a new development direction. According to forecasts, by 2060, non-fossil energy will account for 70% of my country's energy mix. Rooftop photovoltaic distributed power generation is the most widely used form of photovoltaics. Distributed photovoltaics have a wide range of applications, including industrial plants, municipal and other public buildings, commercial buildings, rural areas, remote agricultural and pastoral areas, and islands. Currently, industrial plants are the most popular. Rooftop distributed photovoltaics can be applied to various roof types: metal roofs, flat concrete roofs, and tiled pitched roofs.

[0003] Rooftop photovoltaic installation can affect the existing waterproofing layer. Current photovoltaic bracket installation techniques often involve penetrating installation, which can damage the existing waterproofing layer. Improper perforation treatment can lead to leakage. For metal roofs, the construction process can cause joints to loosen, leading to leaks. For factories, where rooftop photovoltaics are primarily used, severe leaks can shut down operations, resulting in financial losses. While the typical operating lifespan of a photovoltaic power station is 25 years, my country's current waterproofing warranty period is only five years. Leaks within a few years of actual use are common, making leaks and the potential for them a significant concern for existing rooftops.

[0004] Polymer waterproofing membranes are rollable, sheet-like waterproof materials made from synthetic rubber, synthetic resin, or a blend of both, with appropriate amounts of chemical additives and fillers. These membranes are processed through a series of processes, including mixing, plasticating, calendering or extrusion, vulcanization, and shaping. Polymer waterproofing membranes primarily include EPDM (ethylene propylene diene monomer), PVC (polyvinyl chloride), CPE (chlorinated polyethylene), TPO (thermoplastic polyolefin), and HDPE (high-density polyethylene). EPDM, PVC, and TPO are suitable for exposed roofing applications, but current waterproofing regulations limit their service life to 20 years.

[0005] Therefore, there is an urgent need to develop a waterproof membrane for photovoltaic roofs that can achieve a service life of more than 25 years, the same as the life of photovoltaic modules, and at the same time, is easy to maintain and reasonably priced. Summary of the Invention

[0006] The main purpose of this application is to provide a waterproof roll material with good heat resistance and weather resistance, a service life of ≥25 years, and an extremely high solar reflectivity (higher than 80%) on the surface, forming a cool roof effect, which can improve the power generation efficiency of photovoltaic modules.

[0007] In order to achieve the above object, the present invention provides the following technical solutions:

[0008] A polyolefin waterproofing membrane for photovoltaic roofing comprises, from bottom to top, a 0.6mm-0.9mm heat-insulating base layer, a 0.3mm-0.6mm middle reinforcement layer, and a 0.6mm-0.9mm high-reflection surface layer.

[0009] The above-mentioned polyolefin waterproof membrane for photovoltaic roofing, as a preferred embodiment, the thermal insulation base layer includes the following raw materials in parts by weight: 10-30 parts of polypropylene, 10-20 parts of recycled materials, 1-3 parts of modifiers, 20-40 parts of elastomers, 5-15 parts of fillers, 1-3 parts of phosphors, 0.2-0.5 parts of metal passivators, 0.5-1.0 parts of antioxidants, and 5-10 parts of aerogels.

[0010] The above-mentioned polyolefin waterproof membrane for photovoltaic roofing is a preferred embodiment.

[0011] The polypropylene is polypropylene M800e, and its melt flow rate is 7.58 g / 10 min (230° C. / 2.16 kg, GB / T3682.1).

[0012] The recycled material is PP and PE type thermoplastic polyolefin recycled material, and the melt flow rate of the recycled material is 3.0-10.0g / 10min (230℃ / 2.16kg, ASTM D1238);

[0013] The modifier is modifier A-490, manufactured by Shenzhen Jindaquan Technology Co., Ltd., and the melt flow rate of the modifier is ≥100 / 10min;

[0014] The elastomer is POE6102, and the melt flow rate of the elastomer is ≥3.0 g / 10 min (230° C. / 2.16 kg, ASTM D1238).

[0015] The filler is magnesium sulfate whisker;

[0016] The use of magnesium sulfate whiskers as fillers not only improves the tensile properties of the sheet, but also improves the flame retardant properties of the sheet. Magnesium sulfate whiskers are a new type of inorganic flame retardant and reinforced fiber material with a single crystal structure.

[0017] The phosphor is EU-β-diacetone-triphenylphosphine.

[0018] The metal passivator is BASF Irganox MD 1024.

[0019] Metal passivators are used to prevent the catalytic effect of metal ions, especially iron ions, on the degradation of polyolefins, thereby significantly improving the long-term thermal stability and color stability of polyolefins when in contact with metals.

[0020] The antioxidant is BASF Irgafos Antioxidant 168; BASF Irgafos Antioxidant 168 is a hydrolysis-resistant phosphite processing stabilizer. As a secondary antioxidant, it reacts with hydroperoxides formed by natural oxidation during polymer processing, preventing polymer processing degradation and extending the performance of the primary antioxidant.

[0021] The aerogel is silicon dioxide aerogel powder, and the thermal conductivity of the aerogel is 0.0018 W / m·K.

[0022] Aerogel refers to a nano-scale porous solid material formed by the sol-gel method, in which gas replaces the liquid phase in the gel in a certain drying method.

[0023] The composite use of recycled materials (PE and PP) and modifiers, through the modification of the recycled materials by modifiers, reduces the cost of the bottom sheet without affecting the performance of the bottom sheet, and increases the carbon fixation life of the recycled materials.

[0024] By using fluorescent powder in the bottom sheet material, the sheet material will fluoresce under the action of ultraviolet light. This can be used to check the density of the produced composite sheet. If the surface layer fluoresces, the process parameters should be adjusted. It can also be determined whether there are any perforations or seam overlap errors on site.

[0025] In the above-mentioned polyolefin waterproof membrane for photovoltaic roofing, as a preferred embodiment, the middle reinforcement layer is a polyester mesh cloth.

[0026] The above-mentioned polyolefin waterproof membrane for photovoltaic roofing, as a preferred embodiment, the high-reflective surface layer includes the following raw materials in parts by weight: 10-30 parts of polypropylene, 10-20 parts of polyethylene, 20-40 parts of elastomer, 5-15 parts of filler, 5-8 parts of barite, 0.2-0.5 parts of metal passivator, 0.5-1.0 parts of antioxidant, 0.5-1.0 parts of light stabilizer, and 2-5 parts of masterbatch.

[0027] The combined use of light stabilizers and antioxidants improves the weather resistance and heat resistance of the surface sheet. Light stabilizers absorb ultraviolet energy, quench singlet oxygen, and decompose hydroperoxides into inactive substances. These functions enable high molecular polymers to eliminate or slow down the possibility of photochemical reactions under light radiation, thereby preventing or delaying the process of photoaging. Antioxidants can terminate free radical chains, thereby preventing the oxidative degradation of polymers and extending the service life of the product.

[0028] The above-mentioned polyolefin waterproof membrane for photovoltaic roofing is a preferred embodiment.

[0029] The polypropylene is polypropylene M800E, and the melt flow rate of the polypropylene is 7.58 g / 10 min (230° C. / 2.16 kg, GB / T 3682.1);

[0030] The polyethylene is linear low-density polyethylene; the linear low-density polyethylene is non-toxic, tasteless, odorless milky white particles with a density of 0.918-0.935 g / cm 3 Compared with LDPE, it has higher softening temperature and melting temperature, and has the advantages of high strength, good toughness, high rigidity, good heat resistance and cold resistance. It also has good resistance to environmental stress cracking, impact strength, tear strength and other properties. It is resistant to acids, alkalis, organic solvents, etc. and is widely used in industry, agriculture, medicine, health and daily necessities.

[0031] The elastomer is POE6102, and the melt flow rate of the elastomer is 3.0 g / 10 min;

[0032] The filler is magnesium sulfate whisker;

[0033] The barite is barium sulfate;

[0034] The metal passivator is BASF Irganox MD 1024;

[0035] The antioxidant is BASF Irgafos antioxidant 168;

[0036] The light stabilizer is Solvay B882T;

[0037] The color masterbatch is a white masterbatch with the brand name SE8170 and a titanium dioxide content of 70%.

[0038] A second aspect of the present application provides a method for preparing a polyolefin waterproof membrane for photovoltaic roofing, comprising the following steps:

[0039] (1) Preparation of thermal insulation bottom sheet:

[0040] The raw materials contained in the thermal insulation bottom layer are mixed uniformly, and extruded through a twin-screw extruder to obtain a thermal insulation bottom layer sheet;

[0041] (2) Preparation of high reflective surface layer sheet:

[0042] The raw materials of the high-reflective surface layer are mixed evenly, and extruded through a twin-screw extruder to obtain a high-reflective surface layer sheet;

[0043] (3) The heat-insulating base layer, the middle reinforcing layer, and the high-reflective surface layer are calendered and compounded by a three-roll calender to produce a polyolefin waterproof membrane for photovoltaic roofing.

[0044] The above-mentioned method for preparing a polyolefin waterproof membrane for photovoltaic roofing is a preferred embodiment. In step (1), the barrel temperature of the twin-screw extruder is 180°C-185°C, the die head temperature of the extruded material is 180°C-190°C, and the traction speed of the extruded material is 4.5m / min.

[0045] The above-mentioned method for preparing a polyolefin waterproof membrane for photovoltaic roofing is a preferred embodiment. In step (2), the barrel temperature of the twin-screw extruder is 185-190°C, the die head temperature of the extruded material is 180°C-190°C, and the traction speed of the extruded material is 4.5m / min.

[0046] The beneficial effects of the present invention are as follows: the polyolefin waterproof membrane for photovoltaic roofing described in the present invention greatly reduces the surface temperature of the polyolefin sheet on the roof through the composite thermal insulation base layer and the high-reflection surface layer, forming a cool roof, and the power generation efficiency can be increased by 0.3% for every 1°C reduction in roof temperature.

[0047] The polyolefin waterproof membrane for photovoltaic roofing described in the present invention has good welding performance. Its main performance exceeds the standard requirements of GB 27789-2011 "Thermoplastic Polyolefin (TPO) Waterproof Membrane" and has good heat aging resistance, chemical resistance, and weather resistance.

[0048] The polyolefin waterproofing membrane for photovoltaic roofing described in the present invention adopts barite masterbatch and color masterbatch in the surface layer, so that the surface layer sheet has a white glass luster and improves the reflectivity of the surface layer sheet. The reflectivity reaches about 92%, which can greatly improve the photoelectric effect of the double-glass BAPV photovoltaic panel.

[0049] The thermal insulation base and surface layers of the polyolefin waterproofing membrane for photovoltaic roofing described in this invention are modified with thermoplastic elastomers instead of rubber, thereby extending the membrane's service life. Rubber generally contains softening oil, which can reduce the membrane's aging resistance and shorten its service life.

[0050] The polyolefin waterproofing coiled material for photovoltaic roofing of the present invention has a simple preparation process, can be produced under normal pressure conditions, and does not discharge three wastes. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Figure 1 This is a schematic structural diagram of the polyolefin waterproof membrane for photovoltaic roofing according to Example 1 of the present invention;

[0052] In the figure: 1. Highly reflective surface layer; 2. Middle reinforcement layer; 3. Thermal insulation bottom layer. DETAILED DESCRIPTION

[0053] In order to help those skilled in the art better understand the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to examples. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work should fall within the scope of protection of the present invention.

[0054] The modifier A-490 used in this application was purchased from: Shenzhen Jindaquan Technology Co., Ltd.

[0055] The elastomers described in this application were purchased from: ExxonMobil Chemical Co., Ltd.

[0056] The magnesium sulfate whiskers used as fillers in this application were purchased from: Shanghai Shuixing Industrial Co., Ltd.

[0057] The phosphor used in this application was purchased from Jinhua Lijin Technology Co., Ltd.

[0058] The barite used in this application was purchased from: Quzhou Ruierfeng Chemical Co., Ltd.

[0059] The light stabilizer used in this application was purchased from: Solvay (Zhenjiang) Chemicals Co., Ltd.

[0060] The masterbatch used in this application was purchased from Jiangsu Pleike Hongmei Masterbatch Co., Ltd.

[0061] The linear low-density polyethylene used in this application was purchased from Thermo Fisher Scientific Inc. The polyolefin waterproofing membrane for photovoltaic roofing described in this application comprises a thermal insulation base layer, an intermediate reinforcement layer, and a highly reflective surface layer stacked from bottom to top. The surface of the waterproofing membrane produces extremely high solar reflectivity, creating a cool roof effect and thereby improving the power generation efficiency of photovoltaic modules.

[0062] Example 1

[0063] The polyolefin waterproof membrane for photovoltaic roofing described in Example 1 includes a 0.6 mm heat-insulating bottom layer 3, a 0.3 mm intermediate reinforcement layer 2, and a 0.9 mm high-reflection surface layer 1 that are overlapped from bottom to top.

[0064] The thermal insulation bottom layer 3 comprises the following raw materials: polypropylene, recycled materials, modifier, elastomer, filler, phosphor, metal passivator, antioxidant, and aerogel.

[0065] The middle reinforcement layer 2 is a polyester mesh cloth;

[0066] The high reflective surface layer 1 comprises the following raw materials: polypropylene, polyethylene, elastomer, filler, barite, metal passivator, antioxidant, light stabilizer, and masterbatch;

[0067] The polypropylene used in this embodiment is polypropylene M800e, and the melt flow rate of the polypropylene is 7.58g / 10min;

[0068] The polyethylene used in this embodiment is linear low-density polyethylene;

[0069] The recycled material is PP and PE type thermoplastic polyolefin recycled material, and the melt flow rate of the recycled material is 3.0-10.0g / 10min;

[0070] The modifier is modifier A-490, and the melt flow rate of the modifier is ≥100 / 10min;

[0071] The elastomer is POE6102, and the melt flow rate of the elastomer is ≥3.0g / 10min;

[0072] The filler is magnesium sulfate whisker;

[0073] The barite is barium sulfate;

[0074] The phosphor is EU-β-diacetone-triphenylphosphine;

[0075] The metal passivator is BASF Irganox MD 1024;

[0076] The antioxidant is BASF Irgafos antioxidant 168;

[0077] The aerogel is silica aerogel powder, and the thermal conductivity of the aerogel is 0.0018 W / m·K;

[0078] The light stabilizer is Solvay B882T;

[0079] The color masterbatch is a white masterbatch.

[0080] The method for preparing a polyolefin waterproof membrane for photovoltaic roofing described in Example 1 comprises the following steps:

[0081] Preparation of high-reflective surface layer 1: 30 parts of polypropylene M800E, 10 parts of polyethylene 7042N, 20 parts of elastomer POE6102, 10 parts of magnesium sulfate whiskers, 5 parts of barite barium sulfate, 0.5 parts of metal passivator BASF Irganox MD1024, 0.5 parts of BASF BASF Irgafos antioxidant 168, 0.5 parts of light stabilizer Solvay B882T and 2 parts of masterbatch SE8170 were added to a mixer. After mixing for 1.5 hours, the materials entered the twin-screw extruder, the barrel temperature was controlled at 185°C ~ 190°C, the die head temperature of the extruded material was controlled at 180°C ~ 190°C, the pulling speed was 4.5m / min, and the sheet thickness was controlled at 0.6mm-0.9mm.

[0082] Preparation of thermal insulation bottom layer 3: 30 parts of polypropylene M800E, 15 parts of recycled materials, 2.0 parts of modifier A-490, 20 parts of elastomer POE6102, 10 parts of magnesium sulfate whiskers, 2.0 parts of phosphor EU-β-diacetone-triphenylphosphine, 0.4 parts of metal deactivator BASF Irganox MD 1024, 0.8 parts of antioxidant BASF Irgafos antioxidant 168 and 5 parts of aerogel are added to a mixer. After mixing for 1.5 hours, the materials enter a twin-screw extruder. The barrel temperature is controlled at 180°C to 185°C, the die temperature of the extruded material is controlled at 180°C to 190°C, the pulling speed is 4.5 m / min, and sheets of different thicknesses are formed as required to make thermal insulation bottom layer 3 sheets.

[0083] Preparation of waterproof membrane: Two twin-screw extruders simultaneously form a high-reflective surface layer 1 sheet and a heat-insulating bottom layer 3 sheet, and then a three-roll calender calenders the high-reflective surface layer 1, polyester mesh cloth and heat-insulating bottom layer 3 together to prepare a polyolefin waterproof membrane.

[0084] Example 2

[0085] The polyolefin waterproof membrane for photovoltaic roofing described in Example 2 includes a 0.9 mm thermal insulation base layer, a 0.6 mm intermediate reinforcement layer, and a 0.6 mm high-reflection surface layer that are overlapped from bottom to top.

[0086] The heat-insulating bottom layer comprises the following raw materials: polypropylene, recycled materials, modifier, elastomer, filler, fluorescent powder, metal passivator, antioxidant and aerogel.

[0087] The middle reinforcement layer is a polyester mesh cloth;

[0088] The high reflective surface layer comprises the following raw materials: polypropylene, polyethylene, elastomer, filler, barite, metal passivator, antioxidant, light stabilizer, and masterbatch;

[0089] The polypropylene used in this embodiment is polypropylene M800e, and the melt flow rate of the polypropylene is 7.58g / 10min;

[0090] The polyethylene used in this embodiment is linear low-density polyethylene;

[0091] The recycled material is PP and PE type thermoplastic polyolefin recycled material, and the melt flow rate of the recycled material is 3.0-10.0g / 10min;

[0092] The modifier is modifier A-490, and the melt flow rate of the modifier is ≥100 / 10min;

[0093] The elastomer is POE6102, and the melt flow rate of the elastomer is ≥3.0g / 10min;

[0094] The filler is magnesium sulfate whisker;

[0095] The barite is barium sulfate;

[0096] The phosphor is EU-β-diacetone-triphenylphosphine;

[0097] The metal passivator is BASF Irganox MD 1024;

[0098] The antioxidant is BASF Irgafos antioxidant 168;

[0099] The aerogel is silica aerogel powder, and the thermal conductivity of the aerogel is 0.0018 W / m·K;

[0100] The light stabilizer is Solvay B882T;

[0101] The color masterbatch is a white masterbatch.

[0102] The method for preparing a polyolefin waterproof membrane for photovoltaic roofing described in Example 2 comprises the following steps:

[0103] Preparation of the high-reflective surface layer: 10 parts of polypropylene M800E, 15 parts of polyethylene 7042N, 40 parts of elastomer POE6102, 15 parts of magnesium sulfate whiskers, 8 parts of barite barium sulfate, 0.3 parts of metal passivator BASF Irganox MD1024, 0.8 parts of BASF Irgafos antioxidant 168, 1.0 parts of light stabilizer Solvay B882T and 5 parts of masterbatch SE8170 were added to a mixer. After mixing for 1.5 hours, the materials entered a twin-screw extruder. The barrel temperature was controlled at 185°C to 190°C, the die temperature of the extruded material was controlled at 180°C to 190°C, the pulling speed was 4.5m / min, and the sheet thickness was controlled at 0.6mm-0.9mm.

[0104] Preparation of thermal insulation bottom layer: 10 parts of polypropylene M800E, 10 parts of recycled materials, 3.0 parts of modifier A-490, 40 parts of elastomer POE6102, 15 parts of magnesium sulfate whiskers, 3.0 parts of phosphor EU-β-diacetone-triphenylphosphine, 0.5 parts of metal passivator BASF Irganox MD 1024, 1.0 parts of antioxidant BASF Irgafos antioxidant 168 and 10 parts of aerogel are added to a mixer. After mixing for 1.5 hours, the materials enter a twin-screw extruder. The barrel temperature is controlled at 180°C to 185°C, the die temperature of the extruded material is controlled at 180°C to 190°C, the pulling speed is 4.5m / min, and sheets of different thicknesses are formed as required to make thermal insulation bottom layer sheets.

[0105] Preparation of waterproof membrane: Two twin-screw extruders simultaneously form high-reflective surface layer sheets and thermal insulation bottom layer sheets, and then the high-reflective surface layer, polyester mesh cloth and thermal insulation bottom layer are calendered and compounded together by a three-roll calender to prepare polyolefin waterproof membrane.

[0106] Example 3

[0107] The polyolefin waterproof membrane for photovoltaic roofing described in Example 3 includes a 0.7 mm heat-insulating bottom layer, a 0.6 mm middle reinforcement layer, and a 0.8 mm high-reflection surface layer that are overlapped from bottom to top.

[0108] The heat-insulating bottom layer comprises the following raw materials: polypropylene, recycled materials, modifier, elastomer, filler, fluorescent powder, metal passivator, antioxidant and aerogel.

[0109] The middle reinforcement layer is a polyester mesh cloth;

[0110] The high reflective surface layer comprises the following raw materials: polypropylene, polyethylene, elastomer, filler, barite, metal passivator, antioxidant, light stabilizer, and masterbatch;

[0111] The polypropylene used in this embodiment is polypropylene M800e, and the melt flow rate of the polypropylene is 7.58g / 10min;

[0112] The polyethylene used in this embodiment is linear low-density polyethylene;

[0113] The recycled material is PP and PE type thermoplastic polyolefin recycled material, and the melt flow rate of the recycled material is 3.0-10.0g / 10min;

[0114] The modifier is modifier A-490, and the melt flow rate of the modifier is ≥100 / 10min;

[0115] The elastomer is POE6102, and the melt flow rate of the elastomer is ≥3.0g / 10min;

[0116] The filler is magnesium sulfate whisker;

[0117] The barite is barium sulfate;

[0118] The phosphor is EU-β-diacetone-triphenylphosphine;

[0119] The metal passivator is BASF Irganox MD 1024;

[0120] The antioxidant is BASF Irgafos antioxidant 168;

[0121] The aerogel is silica aerogel powder, and the thermal conductivity of the aerogel is 0.0018 W / m·K;

[0122] The light stabilizer is Solvay B882T;

[0123] The color masterbatch is a white masterbatch.

[0124] The method for preparing a polyolefin waterproof membrane for photovoltaic roofing described in Example 3 comprises the following steps:

[0125] Preparation of the high-reflective surface layer: 20 parts of polypropylene M800E, 20 parts of polyethylene 7042N, 30 parts of elastomer POE6102, 5 parts of magnesium sulfate whiskers, 7 parts of barite barium sulfate, 0.2 parts of metal passivator BASF Irganox MD1024, 1.0 parts of BASF Irgafos antioxidant 168, 0.7 parts of light stabilizer Solvay B882T and 4 parts of masterbatch SE8170 were added to a mixer. After mixing for 1.5 hours, the materials entered a twin-screw extruder. The barrel temperature was controlled at 185°C to 190°C, the die temperature of the extruded material was controlled at 180°C to 190°C, the pulling speed was 4.5m / min, and the sheet thickness was controlled at 0.6mm-0.9mm.

[0126] Preparation of thermal insulation bottom layer: 20 parts of polypropylene M800E, 20 parts of recycled materials, 1.0 part of modifier A-490, 30 parts of elastomer POE6102, 5 parts of magnesium sulfate whiskers, 1.0 part of phosphor EU-β-diacetone-triphenylphosphine, 0.2 parts of metal passivator BASF Irganox MD 1024, 0.5 parts of antioxidant BASF Irgafos antioxidant 168 and 8 parts of aerogel are added to a mixer. After mixing for 1.5 hours, the materials enter a twin-screw extruder. The barrel temperature is controlled at 180°C to 185°C, the die temperature of the extruded material is controlled at 180°C to 190°C, the pulling speed is 4.5m / min, and sheets of different thicknesses are formed as required to make thermal insulation bottom layer sheets.

[0127] Preparation of waterproof membrane: Two twin-screw extruders simultaneously form high-reflective surface layer sheets and thermal insulation bottom layer sheets, and then the high-reflective surface layer, polyester mesh cloth and thermal insulation bottom layer are calendered and compounded together by a three-roll calender to prepare polyolefin waterproof membrane.

[0128] Comparative Example 1

[0129] The polyolefin waterproof membrane for photovoltaic roofing described in Comparative Example 1 includes a 0.6 mm heat-insulating bottom layer, a 0.3 mm middle reinforcement layer, and a 0.9 mm high-reflection surface layer that are overlapped from bottom to top.

[0130] The difference between the polyolefin waterproof membrane for photovoltaic roofing described in Comparative Example 1 and the polyolefin waterproof membrane for photovoltaic roofing described in Example 1 is that:

[0131] The method for preparing the polyolefin waterproof membrane for photovoltaic roofing described in Comparative Example 1 comprises the following steps:

[0132] Preparation of the high-reflective surface layer: 30 parts of polypropylene M800E, 10 parts of polyethylene 7042N, 20 parts of elastomer POE6102, 10 parts of magnesium sulfate whiskers, 0 parts of barite barium sulfate, 0.5 parts of metal passivator BASF Irganox MD1024, 0.5 parts of BASF BASF Irgafos antioxidant 168, 0.5 parts of light stabilizer Solvay B882T and 0 parts of masterbatch SE8170 were added to a mixer. After mixing for 1.5 hours, the materials entered a twin-screw extruder. The barrel temperature was controlled at 185°C to 190°C, the die temperature of the extruded material was controlled at 180°C to 190°C, the pulling speed was 4.5m / min, and the sheet thickness was controlled at 0.6mm-0.9mm.

[0133] Preparation of thermal insulation bottom layer: 30 parts of polypropylene M800E, 15 parts of recycled materials, 2.0 parts of modifier A-490, 20 parts of elastomer POE6102, 10 parts of magnesium sulfate whiskers, 2.0 parts of phosphor EU-β-diacetone-triphenylphosphine, 0.4 parts of metal passivator BASF Irganox MD 1024, 0.8 parts of antioxidant BASF Irgafos antioxidant 168 and 5 parts of aerogel are added to a mixer. After mixing for 1.5 hours, the materials enter a twin-screw extruder. The barrel temperature is controlled at 180°C to 185°C, the die temperature of the extruded material is controlled at 180°C to 190°C, the pulling speed is 4.5m / min, and sheets of different thicknesses are formed as required to make thermal insulation bottom layer sheets.

[0134] Preparation of waterproof membrane: Two twin-screw extruders simultaneously form high-reflective surface layer sheets and thermal insulation bottom layer sheets, and then the high-reflective surface layer, polyester mesh cloth and thermal insulation bottom layer are calendered and compounded together by a three-roll calender to prepare polyolefin waterproof membrane.

[0135] Comparative Example 2

[0136] The polyolefin waterproof membrane for photovoltaic roofing described in Comparative Example 2 includes a 0.9 mm thermal insulation base layer, a 0.6 mm intermediate reinforcement layer, and a 0.6 mm high-reflection surface layer that are overlapped from bottom to top.

[0137] The polyolefin waterproof membrane for photovoltaic roofing described in Comparative Example 2 differs from the waterproof membrane described in Example 2 in that:

[0138] The method for preparing a polyolefin waterproof membrane for photovoltaic roofing described in Comparative Example 2 comprises the following steps:

[0139] Preparation of the high-reflective surface layer: 10 parts of polypropylene M800E, 15 parts of polyethylene 7042N, 40 parts of elastomer POE6102, 15 parts of magnesium sulfate whiskers, 8 parts of barite barium sulfate, 0.3 parts of metal passivator BASF Irganox MD1024, 0 parts of antioxidant, 0 parts of light stabilizer and 5 parts of masterbatch SE8170 were added to a mixer. After mixing for 1.5 hours, the materials entered a twin-screw extruder. The barrel temperature was controlled at 185°C to 190°C, the die temperature of the extruded material was controlled at 180°C to 190°C, the pulling speed was 4.5m / min, and the sheet thickness was controlled at 0.6mm-0.9mm.

[0140] Preparation of thermal insulation bottom layer: 10 parts of polypropylene M800E, 10 parts of recycled materials, 3.0 parts of modifier A-490, 40 parts of elastomer POE6102, 15 parts of magnesium sulfate whiskers, 3.0 parts of phosphor EU-β-diacetone-triphenylphosphine, 0.5 parts of metal passivator BASF Irganox MD 1024, 0 parts of antioxidant and 10 parts of aerogel are added to a mixer. After mixing for 1.5 hours, the materials enter the twin-screw extruder. The barrel temperature is controlled at 180℃~185℃, the die temperature of the extruded material is controlled at 180℃~190℃, the pulling speed is 4.5m / min, and sheets of different thicknesses are formed as required to make thermal insulation bottom layer sheets.

[0141] Preparation of waterproof membrane: Two twin-screw extruders simultaneously form high-reflective surface layer sheets and thermal insulation bottom layer sheets, and then the high-reflective surface layer, polyester mesh cloth and thermal insulation bottom layer are calendered and compounded together by a three-roll calender to prepare polyolefin waterproof membrane.

[0142] Comparative Example 3

[0143] The polyolefin waterproof membrane for photovoltaic roofing described in Comparative Example 3 comprises a 0.7 mm heat-insulating bottom layer, a 0.6 mm intermediate reinforcement layer, and a 0.8 mm high-reflection surface layer.

[0144] The method for preparing a polyolefin waterproof membrane for photovoltaic roofing described in Comparative Example 3 comprises the following steps:

[0145] Preparation of the high-reflective surface layer: 20 parts of polypropylene M800E, 20 parts of polyethylene 7042N, 30 parts of elastomer POE6102, 5 parts of magnesium sulfate whiskers, 7 parts of barite barium sulfate resin particles, 0.2 parts of metal passivator BASF Irganox MD1024, 1.0 parts of BASF Irgafos antioxidant 168, 0.7 parts of light stabilizer Solvay B882T and 4 parts of masterbatch SE8170 were added to a mixer. After mixing for 1.5 hours, the materials entered a twin-screw extruder. The barrel temperature was controlled at 185°C to 190°C, the die temperature of the extruded material was controlled at 180°C to 190°C, the pulling speed was 4.5m / min, and the sheet thickness was controlled at 0.6mm-0.9mm.

[0146] Preparation of thermal insulation bottom layer: 20 parts of polypropylene M800E, 20 parts of recycled materials, 0 parts of modifier A-490, 30 parts of elastomer POE6102, 5 parts of magnesium sulfate whiskers, 1.0 part of phosphor EU-β-diacetone-triphenylphosphine, 0.2 parts of metal passivator BASF Irganox MD 1024, 0.5 parts of antioxidant BASF Irgafos antioxidant 168 and 8 parts of aerogel are added to a mixer. After mixing for 1.5 hours, the materials enter a twin-screw extruder. The barrel temperature is controlled at 180°C to 185°C, the die temperature of the extruded material is controlled at 180°C to 190°C, the pulling speed is 4.5m / min, and sheets of different thicknesses are formed as required to make thermal insulation bottom layer sheets.

[0147] Preparation of waterproof membrane: Two twin-screw extruders simultaneously form high-reflective surface layer sheets and thermal insulation bottom layer sheets, and then the high-reflective surface layer, polyester mesh cloth and thermal insulation bottom layer are calendered and compounded together by a three-roll calender to prepare polyolefin waterproof membrane.

[0148] Performance study of a polyolefin waterproof membrane for photovoltaic roofing according to the present invention: The test results are shown in Table 1:

[0149] Remark:

[0150] Shore D hardness: test method is GB / T 2411; technical index is 30-35;

[0151] Thermal aging (115°C, 365d) maximum tensile strength retention / %: test method GB 27789, technical index ≥90;

[0152] Seam peel strength / (N / mm): Test method GB 27789, technical index 4.0 or coil failure;

[0153] Solar reflectance / %: Test method JG / T 235;

[0154] Artificial climate accelerated aging / h: test method GB / T 16422.2, technical index 2500;

[0155] Low temperature flexure: Test method GB 27789, technical indicator: no cracks at -40℃;

[0156] Combustion performance: Test method GB 8624-2012, technical indicator B1.

[0157] Table 1 Performance study of the waterproof membrane of the present invention

[0158]

[0159] It can be seen from Table 1 that the waterproof membranes described in Examples 1-3 all have good heat aging resistance, artificial weathering aging, low-temperature flexural resistance, seam peel strength and B1 fire self-extinguishing properties. These properties can ensure that the polyolefin waterproof membrane of the present invention can be used on photovoltaic roofs.

[0160] Example 1 uses a large amount of polypropylene, which is a type of resin particle with good thermoplasticity and exhibits excellent seam peel strength; Example 2 uses a large amount of light stabilizer and antioxidant, and the light stabilizer improves the sheet's resistance to accelerated aging in artificial climate, and the antioxidant improves the sheet's heat resistance; Example 3 uses a large amount of recycled and regenerated materials, and after modification with a modifier, the aging resistance does not change significantly, and is even better than the performance of Example 1.

[0161] Comparative Example 1 removes the amount of barite masterbatch and color masterbatch on the basis of Example 1. From the test results in Table 1, it can be seen that its solar reflectance is greatly reduced. At the same time, it also affects the heat resistance and resistance to accelerated aging of the sheet in artificial climate. Therefore, increasing the emissivity of the sheet and lowering the temperature of the sheet are beneficial to improving the aging resistance of the sheet, thereby increasing the service life of the sheet.

[0162] Comparative Example 2 removes the antioxidant and light stabilizer on the basis of Example 2. From the test results in Table 1, it can be seen that its maximum tensile retention rate after thermal aging (115°C, 365d) and artificial climate accelerated aging decrease rapidly. Such aging resistance cannot be used for photovoltaic roofs. Even if it is used for waterproofing of photovoltaic roofs, its service life is greatly reduced and cannot reach a service life of 25 years.

[0163] Comparative Example 3 removes the modifier in the bottom insulation layer on the basis of Example 3. From the test results in Table 1, except for the solar reflectance performance, all other properties have declined. Comparative Example 3 and Example 3 use a large amount of recycled materials. Without modifying the recycled materials, the seam peel strength and low-temperature bendability of the sheet are directly affected, the basic performance does not meet the requirements, the aging resistance will also be affected accordingly, and the service life of the sheet will also be affected.

[0164] The above is only a preferred embodiment of the present invention. It should be pointed out that ordinary technicians in this technical field can make several improvements and supplements without departing from the method of the present invention. These improvements and supplements should also be regarded as the scope of protection of the present invention.

Claims

1. A polyolefin waterproof membrane for photovoltaic roofing, characterized in that: The polyolefin waterproof membrane comprises, from bottom to top, a 0.6mm-0.9mm heat-insulating bottom layer, a 0.3mm-0.6mm middle reinforcement layer, and a 0.6mm-0.9mm high-reflective surface layer; The thermal insulation bottom layer comprises the following raw materials in parts by weight: 10-30 parts of polypropylene, 10-20 parts of recycled materials, 1-3 parts of modifier, 20-40 parts of elastomer, 5-15 parts of filler, 1-3 parts of phosphor, 0.2-0.5 parts of metal passivator, 0.5-1.0 parts of antioxidant, and 5-10 parts of aerogel; the polypropylene is polypropylene M800e, and the melt flow rate of the polypropylene is 7.58g / 10min; the recycled materials are PP and PE type thermoplastic polyolefins. Hydrocarbon recycled material, the melt flow rate of the recycled material is 3.0-10.0 g / 10 min; the modifier is modifier A-490, and the melt flow rate of the modifier is ≥100 g / 10 min; the elastomer is elastomer POE6102, and the melt flow rate of the elastomer is ≥3.0 g / 10 min; the filler is magnesium sulfate whisker; the phosphor is EU-𝛃-diacetone-triphenylphosphine; the metal passivator is BASF BASFIrganox MD 1024; the antioxidant is BASF BASFIrgafos antioxidant 168; the aerogel is silica aerogel powder, and the thermal conductivity of the aerogel is 0.0018 W / m·K; The high-reflective surface layer includes the following raw materials in parts by weight: 10-30 parts of polypropylene, 10-20 parts of polyethylene, 20-40 parts of elastomer, 5-15 parts of filler, 5-8 parts of barite, 0.2-0.5 parts of metal deactivator, 0.5-1.0 parts of antioxidant, 0.5-1.0 parts of light stabilizer, and 2-5 parts of masterbatch; the polypropylene is polypropylene M800E, and the melt flow rate of the polypropylene is 7.58 g / 10 min; the polyethylene is linear low-density polyethylene; the elastomer is POE6102, and the melt flow rate of the elastomer is 3.0 g / 10 min; the filler is magnesium sulfate whisker; the barite is barium sulfate; the metal deactivator is BASF Irgafos MD 1024; the antioxidant is BASF Irgafos antioxidant 168; the light stabilizer is Solvay B882T; and the masterbatch is a white masterbatch.

2. The polyolefin waterproof membrane for photovoltaic roofing according to claim 1, characterized in that: The middle reinforcement layer is polyester mesh cloth.

3. The method for preparing a polyolefin waterproof membrane for photovoltaic roofing according to any one of claims 1 to 2, characterized in that: The following steps are involved: (1) Preparation of thermal insulation bottom sheet: The raw materials contained in the thermal insulation bottom layer are mixed uniformly, and extruded through a twin-screw extruder to obtain a thermal insulation bottom layer sheet; (2) Preparation of high reflective surface sheet: The raw materials of the high-reflective surface layer are mixed evenly, and extruded through a twin-screw extruder to obtain a high-reflective surface layer sheet; (3) The heat-insulating base layer, the middle reinforcing layer and the high-reflective surface layer are calendered and compounded by a three-roll calender to produce a polyolefin waterproof membrane for photovoltaic roofing.

4. The method for preparing a polyolefin waterproof membrane for photovoltaic roofing according to claim 3, characterized in that: In step (1), the barrel temperature of the twin-screw extruder is 180°C-185°C, the die temperature of the extruded material is 180°C-190°C, and the pulling speed of the extruded material is 4.5m / min.

5. The method for preparing a polyolefin waterproof membrane for photovoltaic roofing according to claim 3, characterized in that: In step (2), the barrel temperature of the twin-screw extruder is 185-190°C, the die temperature of the extruded material is 180-190°C, and the pulling speed of the extruded material is 4.5 m / min.

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