A polymer composite coil with thermal management function and preparation method thereof

Abstract

The present invention relates to a polymer composite coil with thermal management functions and a method for preparing the same. The polymer composite coil comprises a heat-reflecting layer, a first waterproof and thermal-insulating layer, a temperature-regulating layer, a second waterproof and thermal-insulating layer, and a gravel layer, which are sequentially stacked. The first and second waterproof and thermal-insulating layers are made from thermoplastic polyolefin elastomers and heat-expandable microspheres, respectively. The temperature-regulating layer comprises a polyester fiber mesh, a phase-change material filled within the polyester fiber mesh, and phase-change microcapsules modified on the surface of the polyester fiber mesh. The polymer composite coil achieves thermal management through the triple effects of surface heat radiation, reduced heat conduction, and active heat regulation. Compared to traditional thermally insulating and reflective roofing materials, it has active heat storage and release regulation capabilities, enabling true heat and cold management.

Description

Technical Field

[0001] The present invention belongs to the technical field of polymer composite building materials, and in particular relates to a polymer composite coil with a thermal management function and a preparation method thereof. Background Art

[0002] Green buildings, also known as sustainable buildings, utilize innovative structures, materials, and designs to maximize resource conservation, environmental protection, and pollution reduction throughout a building's lifecycle, providing affordable and practical living spaces. Currently, building energy consumption has become one of the three major energy consumption factors, accounting for 20% to 30% of the nation's total energy consumption. Compared to traditional buildings, green buildings utilize scientific overall design, environmentally friendly, and low-energy materials to achieve energy resource recycling and effectively reduce energy consumption. my country attaches great importance to the development of green buildings and has promulgated the "Green Building Evaluation Standard," which has gradually transitioned from a guiding principle to a mandatory one to promote the transformation and upgrading of green buildings.

[0003] Green building materials are the foundation of energy-saving and environmentally friendly buildings. Among them, building materials with thermal management functions are one of the most important functional building materials, mainly including foam boards, thermal insulation wool, and thermal insulation coatings. Among them, thermal insulation panels such as XPS extruded insulation boards and rock wool boards are widely used. They mainly reduce heat conduction by creating an internal porous and loose structure. They have the advantages of high porosity, light weight, and low price. However, they have poor impact resistance and water resistance, are difficult to construct, have high maintenance costs, are not flame retardant, and generate a large amount of construction waste after the building is abandoned, which has a significant impact on the environment. At present, thermal insulation coatings can be divided into (1) light reflective type, which uses pigments and fillers with high solar reflectance, near-infrared reflectance and hemispherical emissivity to reflect and reduce the sunlight or radiant heat reaching the surface of the building, such as modified nano inorganic powders, to reduce the use of refrigeration equipment such as air conditioners; (2) heat insulation type, which uses low thermal conductivity microstructures with nano porous structures or hollow structures as insulation materials to reduce the conduction of radiant heat inside the coating, including glass hollow microspheres, ceramic microspheres, aerogels, foams, etc., which are the same as the principles of thermal insulation boards. However, since light reflective coatings do not have a separate thermal insulation effect, and the reflective ability decays with the aging of the coating itself; the addition of hollow microspheres reduces the construction performance of the system, requires a high coating thickness, is prone to cracking, and has an uneven paint film. In addition, although thermal insulation coatings have advantages over traditional foam boards such as strong compatibility and convenient construction, their thermal insulation effect cannot reach the performance of traditional thermal insulation boards, so their development and application are limited.

[0004] From the working mechanism of existing thermal insulation materials, it can be seen that thermal insulation materials do not have the function of reflecting sunlight and reducing radiant heat, while reflective materials do not have a thermal insulation effect. The two cannot be used interchangeably. Therefore, superimposing the two thermal insulation materials can achieve a better thermal insulation effect. Patent CN114316657A discloses a reflective thermal insulation coating system, which includes a reflective primer, a thermal insulation topcoat, and an anti-fouling topcoat varnish. It has a certain solar reflectance, near-infrared reflectance, and hemispherical emissivity, and has a low thermal conductivity coefficient. However, the construction is cumbersome and the cost is high, and the reflectance and thermal insulation effect are mutually restricted.

[0005] Although the above materials can obtain functional building materials with thermal insulation effects through different insulation mechanisms, due to technical limitations and material limitations, the thermal insulation effect can only be achieved by changing the heat conduction path. They do not have thermal management functions, that is, they actively adjust temperature changes through the thermal response ability of the material itself, and cannot truly achieve hot and cold management. Summary of the Invention

[0006] The technical problem to be solved by the present invention is that the existing building materials do not have the function of actively adjusting temperature changes and cannot truly achieve heat and cold management. The present invention provides a polymer composite roll with thermal management function and a preparation method thereof. The polymer composite roll has the functions of light and heat reflection, temperature self-regulation, thermal insulation, etc., and is particularly suitable for use as an exposed cool roofing material.

[0007] In order to achieve the above object, the technical solution adopted by the present invention is:

[0008] A polymer composite coiled material includes a heat-reflecting layer, a first waterproof and heat-insulating layer, a temperature-regulating layer, a second waterproof and heat-insulating layer, and a gravel layer stacked in sequence, wherein the raw material formulas of the first waterproof and heat-insulating layer and the second waterproof and heat-insulating layer respectively include a thermoplastic polyolefin elastomer and heat-expandable microspheres, and the temperature-regulating layer includes a polyester fiber mesh cloth, a phase change material filled in the polyester fiber mesh cloth, and phase change microcapsules modified on the surface of the polyester fiber mesh cloth.

[0009] According to some embodiments of the present invention, the phase-change microcapsules have a core-shell structure, wherein the shell layer is melamine, silica, polyurea, polyurethane, polyimide, or polymethyl methacrylate, and the core layer is a phase-change material. Furthermore, in the phase-change microcapsules, the phase-change material is an alkane phase-change material, preferably selected from C12 to C26 normal alkanes.

[0010] According to some embodiments of the present invention, the phase change material filled in the polyester fiber mesh is a combination of one or more of polyethylene glycol (PEG), octadecane, eicosane, and hydrocarbon paraffin. Preferably, the filling amount of the phase change material filled in the polyester fiber mesh is saturated filling.

[0011] In some embodiments, the fibers used in the polyester fiber mesh cloth are hollow-structured special-shaped fibers, such as a cross-shaped hollow structure or an elliptical hollow structure. The interior of the hollow structure is filled with phase change material, the phase change temperature is 20-60°C, and the fiber can adjust the temperature to 3-5°C.

[0012] In some embodiments, the diameter of the phase-change microcapsules is 1 to 10 μm, and the enthalpy value of the phase-change microcapsules is greater than or equal to 180 J / g.

[0013] According to some embodiments of the present invention, the heat-expandable microspheres are polymer microspheres with a core-shell structure, the shell layer is polyacrylate, and the core layer is an alkane compound with a boiling point below 100°C. The diameter of the heat-expandable microspheres before expansion is 10-50 μm.

[0014] Preferably, the wall thickness of the heat-expandable microspheres before expansion is 1.5-2.5 μm, the wall thickness after expansion is 0.05-0.15 μm, and the expansion temperature is 75-260°C.

[0015] Furthermore, the alkane compound with a boiling point below 100° C. includes but is not limited to a combination of one or more of butane, pentane, and isooctane.

[0016] According to some embodiments of the present invention, in the first waterproof and heat-insulating layer and the second waterproof and heat-insulating layer, the mass ratio of the thermoplastic polyolefin elastomer to the heat-expandable microspheres is 2.5 to 5:1; and / or, in the first waterproof and heat-insulating layer and the second waterproof and heat-insulating layer, the thermoplastic polyolefin elastomer is a propylene-ethylene copolymer elastomer.

[0017] According to some embodiments of the present invention, the raw material formula of the first waterproof and heat-insulating layer and the second waterproof and heat-insulating layer further includes an ultraviolet shielding agent and a heat stabilizer.

[0018] According to some embodiments of the present invention, the raw material formulas of the first waterproof and heat-insulating layer and the second waterproof and heat-insulating layer respectively include, by weight:

[0019]

[0020] According to some embodiments of the present invention, the raw material formula of the heat reflective layer includes a thermoplastic elastomer, a heat insulating filler and a reflective filler, and the mass ratio of the thermoplastic elastomer, the heat insulating filler and the reflective filler is 10:1-2.5:1-2.6.

[0021] Furthermore, in the heat reflection layer, the thermoplastic elastomer is a thermoplastic polyolefin elastomer and SEBS in a mass ratio of 1 to 3:1.

[0022] Furthermore, the raw material formula of the heat reflective layer includes the following components in parts by weight:

[0023]

[0024] In some preferred embodiments, the reflective filler is reflective titanium dioxide and other reflective fillers in a mass ratio of 1:0.5-2.

[0025] Furthermore, the reflective titanium dioxide is rutile titanium dioxide with near-infrared reflective properties, the surface of which is coated with a dense silicon-aluminum double film, and the content of titanium dioxide is ≥90%.

[0026] Furthermore, the other reflective fillers are a combination of one or more high infrared reflectivity spinel structure metal sulfides or metal oxides, such as a combination of one or more of molybdenum disulfide, cobalt trioxide, ferric oxide, indium tin oxide, antimony tin oxide, and aluminum-doped zinc oxide.

[0027] In some preferred embodiments, the thermal insulation filler is surface-modified hollow microspheres, specifically surface-modified using a silane coupling agent, and the diameter of the hollow microspheres is 10 to 30 μm. The hollow microspheres include but are not limited to hollow ceramic microspheres and hollow glass microspheres, and the silane coupling agent is one of KH550, KH560, and KH570.

[0028] The preparation method of the surface-modified hollow microspheres comprises mixing the hollow microspheres with a silane coupling agent in the presence of anhydrous ethanol, reacting the mixture at 70-80°C for 0.5-1.5 hours, cooling the mixture to room temperature, filtering the mixture, washing the mixture, and then drying the mixture at 90-110°C for 23-25 hours. The amount of the silane coupling agent used is 0.5-1% of the mass of the hollow microspheres.

[0029] In the heat reflective layer, the first waterproof and heat insulating layer, and the second waterproof and heat insulating layer, the propylene ethylene copolymer elastomer is an ethylene-α-olefin copolymer thermoplastic elastomer synthesized using a metallocene catalyst, with a melt index range of 1-5 g / 10 min (190° C., 2.16 kg) and a melting temperature of 60-110° C.

[0030] Furthermore, the SEBS is an infrared transparent linear triblock copolymer with polystyrene as the terminal segment and ethylene-butylene copolymer as the middle elastic block, with a styrene content of 30% to 40% and a molecular weight of 100,000 to 300,000.

[0031] Furthermore, the light stabilizer is a block oligomerized high molecular weight hindered amine light stabilizer with a molecular weight of 2000 to 3500 and a melting point of 120 to 150°C.

[0032] Furthermore, the ultraviolet shielding agent is a benzophenone anti-ultraviolet agent, such as a combination of one or more of 2-hydroxy-4-n-octyloxybenzophenone, 4-methoxy-2-hydroxybenzophenone, and 2,2'-hydroxy-4-methoxybenzophenone.

[0033] The antioxidant is a phenolic antioxidant, such as one or more combinations of B215, B225, Cyanox11790, Irganox245, SumilizerGA / Mark AO-80, Topanol205, Antioxidant HPM-12, Irganox1425, and Anox20.

[0034] According to some embodiments of the present invention, the gravel layer is formed by laying anti-sticking sand on the surface of hot-melt acrylic pressure-sensitive adhesive, and the particle size of the anti-sticking sand is 30 to 120 meshes.

[0035] According to some embodiments of the present invention, the thickness ratio of the heat reflective layer, the first waterproof and heat-insulating layer, the temperature regulating layer, the second waterproof and heat-insulating layer and the gravel layer is 1-6:5-10:6-10:5-10:1-6, and the total thickness of the polymer composite coil is 0.9-2 mm.

[0036] The second technical solution adopted by the present invention is: the preparation method of the polymer composite coiled material described above, the raw materials of the heat reflective layer include SEBS, thermoplastic polyolefin elastomer, thermal insulation filler, reflective filler, flame retardant, UV shielding agent, antioxidant and light stabilizer, the raw material formula of the first waterproof and heat-insulating layer and the second waterproof and heat-insulating layer respectively include thermoplastic polyolefin elastomer, heat-expandable microspheres, UV shielding agent and heat stabilizer, and the preparation method comprises the following steps:

[0037] Step S1, extruding and granulating SEBS and thermoplastic polyolefin elastomer, and then mixing them with thermal insulation filler and reflective filler to obtain a mixture;

[0038] Step S2, mixing the mixture obtained in step S1 with a flame retardant, a UV shielding agent, an antioxidant, and a light stabilizer, extruding through an extruder, pulling, and cooling to obtain a heat-reflective polymer sheet;

[0039] Step S3, mixing a thermoplastic polyolefin elastomer, heat-expandable microspheres, a UV shielding agent, and a heat stabilizer, and then co-extruding the mixture onto both sides of the temperature-regulating layer, rolling the mixture into a composite, and cooling the composite to obtain a polymer composite sheet including a first waterproof and heat-insulating layer, a temperature-regulating layer, and a second waterproof and heat-insulating layer stacked in sequence;

[0040] Step S4, hot-pressing the heat-reflective polymer sheet obtained in step S2 and the polymer composite sheet obtained in step S3 to obtain a polymer composite sheet including a heat-reflective layer, a first waterproof and heat-insulating layer, a temperature-regulating layer, and a second waterproof and heat-insulating layer stacked in sequence;

[0041] Step S5, coating the second waterproof and heat-insulating layer of the polymer composite sheet obtained in step S4 with a hot melt pressure-sensitive adhesive, then laying anti-sticking sand, roller-forming, and cooling to obtain the polymer composite coil.

[0042] Furthermore, the specific implementation method of step S1 is: SEBS and thermoplastic polyolefin elastomer are added to a twin-screw extruder for mixing, the screw speed is 25 to 35 rpm, the temperature is 130 to 190°C, extrusion, pulling, water cooling, and granulation, and then the granules and thermal insulation filler and reflective filler are put into the twin-screw extruder again for mixing, the screw speed is 25 to 35 rpm, the temperature is 150 to 200°C, and the mixture is evenly mixed and then exhausted to obtain a mixture.

[0043] Furthermore, the specific implementation method of step S2 is: the mixture obtained in step S1 is mixed with a flame retardant, a UV shielding agent, an antioxidant and a light stabilizer, and then put into an extruder at an extruder temperature of 190 to 210° C. The heat reflective polymer sheet is obtained by extrusion, pulling, cooling, and winding and shaping.

[0044] Furthermore, the thickness of the polymer composite sheet in step S4 is 0.8 to 1.5 mm.

[0045] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art:

[0046] The polymer composite coil of the present invention achieves thermal management function through the triple effects of surface heat radiation, reduced heat conduction, and active heat regulation. Compared with traditional thermal insulation reflective roofing materials, it has active heat storage and release regulation functions and can realize true cold and heat management.

[0047] The polymer composite coil of the present invention also has waterproof properties and is suitable for exposed use. At the same time, due to the surface anti-ultraviolet radiation properties, it has good weather resistance, and the composite of multiple flexible resins and the internal reinforcement of polyester fibers give it excellent ductility and mechanical strength. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 Schematic diagram of the structure of the polymer composite coil with thermal management function of Example 1;

[0049] In the figure: 1. Heat-reflecting layer; 2. First waterproof and heat-insulating layer; 3. Temperature-regulating layer; 4. Second waterproof and heat-insulating layer; 5. Gravel layer. DETAILED DESCRIPTION

[0050] As mentioned in the background, existing building materials cannot truly achieve heat and cold management. This invention combines multiple heat transfer and conversion principles to achieve thermal management through the triple effects of surface heat radiation, reduced heat conduction, and active heat regulation. Compared to traditional thermally insulating reflective roofing materials, this polymer composite membrane has active heat storage and release regulation, truly achieving heat and cold management.

[0051] Furthermore, the present invention first enhances the surface reflection efficiency of the coil by combining a variety of reflective materials, and greatly improves the surface thermal radiation by utilizing the special crystal structure and three-dimensional hollow structure of inorganic materials, and has good reflection efficiency in the entire incident wavelength range; and utilizes hollow, ultra-low density thermal expansion microspheres to further regulate solar radiation, reduce the conduction of heat within the material, and the thermal expansion microspheres can also improve the mechanical properties of the coil. When the internal and external temperatures change, the polyester fiber with temperature regulation function and the phase change material inside the phase change microcapsule will undergo a phase change, and by absorbing or releasing a large amount of latent heat, the temperature change of the coil itself is reduced, thereby achieving the effect of intelligent temperature regulation, and the multi-layer structural design can well protect the stability of the internal phase change material, avoiding problems such as liquid material loss, volume change, and corrosion. The coordinated application of the above principles better guarantees the energy-saving cool roof effect, and is a new type of energy-saving and environmentally friendly polymer roofing material.

[0052] The technical solutions of the present invention are described in detail below in conjunction with specific embodiments so that those skilled in the art can better understand and implement the technical solutions of the present invention, but the present invention is not limited to the scope of the examples.

[0053] Example 1

[0054] The polymer composite coil with thermal management function provided in this embodiment is as follows: Figure 1 As shown, it includes a heat reflecting layer 1, a first waterproof and heat-insulating layer 2, a temperature regulating layer 3, a second waterproof and heat-insulating layer 4 and a gravel layer 5 which are stacked in sequence from top to bottom.

[0055] In this example, the raw material formula of the heat reflection layer 1 is shown in Table 1.

[0056] Table 1 is the raw material formula of the heat reflection layer

[0057]

[0058] In this example, the raw material formulas of the first waterproof and heat-insulating layer 2 and the second waterproof and heat-insulating layer 4 are shown in Table 2.

[0059] Table 2 is the raw material formula of the first waterproof and heat-insulating layer and the second waterproof and heat-insulating layer

[0060]

[0061]

[0062] In this example, surface-modified hollow microspheres were prepared by the following method: hollow glass microspheres C100 and silane coupling agent KH550 were mixed, reacted at 70-80°C for 1 hour, cooled to room temperature, filtered, washed, and then dried at 90-100°C for 24 hours. The amount of silane coupling agent used was 0.8% of the mass of the hollow glass microspheres. The hollow glass microspheres were purchased from Zhongke Huaxing New Materials Co., Ltd.

[0063] In this example, the temperature regulating layer was prepared as follows: (1) 10 parts of polyurethane adhesive emulsion and 80 parts of phase change microcapsule emulsion were mixed to prepare a finishing liquid; (2) the finishing liquid was applied to an elliptical hollow structure polyester fiber mesh cloth saturated with PEG by a dipping and rolling method, and then dried to obtain a temperature regulating layer.

[0064] Among them, the phase change microcapsule emulsion uses RX-xb001 from Hefei Ruixue New Material Technology Co., Ltd.

[0065] In this example, the gravel layer 5 is formed by laying anti-sticking sand on the surface of hot-melt acrylic pressure-sensitive adhesive, and the particle size of the anti-sticking sand is 40 mesh.

[0066] The polymer composite coil with thermal management function in this example is prepared by the following method:

[0067] (1) SEBS and propylene-ethylene copolymer elastomer are added to a twin-screw extruder for mixing at a screw speed of 30 rpm and a temperature of 170°C, and granulated after extrusion, pulling, water cooling, drying, etc.; the obtained extruded particles are then added to a twin-screw extruder for mixing with a heat-insulating filler and a reflective filler, and the mixture is plasticized to obtain a heat-reflecting layer;

[0068] (2) adding the mixture of the heat reflective layer, the flame retardant, the ultraviolet shielding agent, the antioxidant and the light stabilizer into a mixing kettle for mixing, and then feeding the mixture into an extruder at a temperature of 190° C., and performing extrusion, pulling, cooling and winding to obtain a heat reflective polymer sheet;

[0069] (3) adding propylene-ethylene copolymer elastomer, heat-expandable microspheres, ultraviolet shielding agent and heat stabilizer into a twin-screw extruder for mixing at a screw speed of 30 rpm and a temperature of 140° C. to obtain a mixture for a waterproof and heat-insulating layer;

[0070] (4) Extruding the mixture of the waterproof and heat-insulating layer onto both sides of the temperature-regulating layer by multi-layer co-extrusion, rolling and compounding, and cooling to obtain a polymer composite sheet comprising a first waterproof and heat-insulating layer, a temperature-regulating layer, and a second waterproof and heat-insulating layer stacked in sequence, with a thickness of 1.4 mm, wherein the thickness ratio of the first waterproof and heat-insulating layer, the temperature-regulating layer, and the second waterproof and heat-insulating layer is 1:1:1;

[0071] (5) hot-pressing the heat-reflecting polymer sheet of step 2 and the polymer composite sheet of step 4 to obtain a polymer composite sheet comprising a heat-reflecting layer, a first waterproof and heat-insulating layer, a temperature-regulating layer, and a second waterproof and heat-insulating layer stacked in sequence, with a thickness of 1.5 mm, wherein the thickness ratio of the heat-reflecting layer, the first waterproof and heat-insulating layer, the temperature-regulating layer, and the second waterproof and heat-insulating layer is 2:8:8:8;

[0072] (6) Applying hot-melt acrylic pressure-sensitive adhesive with a coating thickness of 0.5 mm on the second waterproof and heat-insulating layer, and then evenly spreading anti-sticking sand on the adhesive surface. After rolling and forming with a rubber roller, the polymer composite coil is pulled, cooled, and rolled up to obtain a high molecular weight composite coil.

[0073] Example 2

[0074] The polymer composite coil with thermal management function provided in this embodiment is basically the same as that in embodiment 1, except that:

[0075] In the raw material formula of the heat reflection layer, the amount of the heat insulation filler is 15 parts, the amount of the emissive titanium dioxide is 8 parts, and the remaining components and amounts are the same as in Example 1.

[0076] In the first waterproof and heat-insulating layer and the second waterproof and heat-insulating layer, the amount of heat-expandable microspheres used is 15 parts, and the other components and amounts are the same as in Example 1.

[0077] Example 3

[0078] The polymer composite coil with thermal management function provided in this embodiment is basically the same as Example 1, except that the raw material formulas of the first waterproof and heat-insulating layer and the second waterproof and heat-insulating layer are 50 parts of propylene-ethylene copolymer elastomer, 12 parts of heat-expandable microspheres, 0.2 parts of ultraviolet shielding agent and 0.2 parts of thermal stabilizer, respectively.

[0079] Example 4

[0080] The polymer composite coil with thermal management function provided in this embodiment is basically the same as that in embodiment 1, except that:

[0081] The thermal expansion microspheres in the first waterproof and heat-insulating layer and the second waterproof and heat-insulating layer are Expancel 091DU 140, which has a particle size about twice that of Expancel 091DU 40 used in Example 1.

[0082] Comparative Example 1

[0083] The polymer composite coil provided in this comparative example is basically the same as that in Example 1, but differs from Example 1 in that no reflective filler is added to the heat reflective layer.

[0084] Comparative Example 2

[0085] The polymer composite coil provided in this comparative example is basically the same as that in Example 1, except that the first waterproof and heat-insulating layer and the second waterproof and heat-insulating layer use surface-modified hollow glass microspheres instead of thermal expansion microspheres.

[0086] Comparative Example 3

[0087] The polymer composite coil provided in this comparative example is basically the same as that in Example 1, except that the temperature regulating layer is made of ordinary polyester fiber non-woven fabric.

[0088] Comparative Example 4

[0089] The polymer composite coil provided in this comparative example is basically the same as Example 1, except that the temperature regulating layer adopts an elliptical hollow structure polyester fiber mesh cloth saturated with PEG as in Example 1, and the surface of the polyester fiber mesh cloth is not modified with phase change microcapsules.

[0090] Comparative Example 5

[0091] The polymer composite coil provided in this comparative example is basically the same as Example 1, and differs from Example 1 in that the heat-expandable microspheres in the first waterproof and heat-insulating layer and the second waterproof and heat-insulating layer adopt the SA3000 foaming agent of Zhejiang Shuntai Rubber and Plastic Technology Co., Ltd.

[0092] Comparative Example 6

[0093] The polymer composite coil provided in this comparative example includes a heat reflection layer, a waterproof and heat-insulating layer, a temperature regulating layer, a waterproof layer and a gravel layer stacked in sequence from top to bottom, wherein the raw material of the waterproof and heat-insulating layer is the same as the first waterproof and heat-insulating layer in Example 1.

[0094] The difference between this example and Example 1 is that no heat-expandable microspheres are added to the waterproof layer.

[0095] 1. Mechanical properties test

[0096] The polymer composite coils of Examples 1 to 4 and Comparative Examples 1 to 6 were tested according to the GB / T 23260-2009 standard. The results are shown in Tables 3 and 4.

[0097] Table 3 is the mechanical properties test results of the polymer composite coils of Examples 1 to 4

[0098]

[0099] Table 4 is the mechanical properties test results of the polymer composite coils of Comparative Examples 1 to 6

[0100]

[0101] 2. Surface reflectivity and thermal conductivity performance test

[0102] The surface reflectivity of Examples 1 to 4 and Comparative Examples 1 to 6 was tested according to GJB 5023.1-2003, and the thermal conductivity was tested according to GB / T 10297-2015. The results are shown in Tables 5 and 6.

[0103] Table 5 shows the test results of surface reflectivity and thermal conductivity of the polymer composite coils of Examples 1 to 4.

[0104]

[0105] Table 6 is the test results of surface reflectivity and thermal conductivity of the polymer composite coils of Comparative Examples 1 to 6

[0106]

[0107] 3. Temperature regulation performance test

[0108] The polymer composite coils of Examples 1 to 4 and Comparative Examples 1 to 6 were respectively adhered to different 0.3 mm thick tinplates. The temperature of the back of the tinplate was approximately 15°C before testing. The surface was then irradiated with a 200 W infrared lamp for 30 minutes and 60 minutes before testing the back temperature of the tinplate. The results are shown in Tables 7 and 8.

[0109] Table 7 shows the test results of the temperature regulation performance of the polymer composite coils of Examples 1 to 4.

[0110] Test items Example 1 Example 2 Example 3 Example 4 Irradiation for 30 minutes 20.3℃ 18.8℃ 19.5℃ 19.2℃ 60 min irradiation 32.6℃ 31.1℃ 30.6℃ 30.5℃

[0111] Table 8 shows the test results of the temperature regulation performance of the polymer composite coils of Comparative Examples 1 to 6.

[0112] Test items Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 Comparative Example 6 Irradiation for 30 minutes 28.3℃ 24.2℃ 25.2℃ 22.6℃ 22.8℃ 32.5℃ 60 min irradiation 39.6℃ 35.8℃ 43.3℃ 36.1℃ 35.1℃ 49.6℃

[0113] The above embodiments are intended only to illustrate the technical concepts and features of the present invention. Their purpose is to enable those skilled in the art to understand the contents of the present invention and implement them accordingly. They are not intended to limit the scope of protection of the present invention. Any equivalent changes or modifications made in accordance with the spirit of the present invention are intended to be covered by the scope of protection of the present invention.

[0114] The endpoints of the ranges and any values disclosed herein are not limited to the precise ranges or values, and these ranges or values should be understood to include values close to these ranges or values. For numerical ranges, the endpoints of each range, the endpoints of each range and individual point values, and the individual point values can be combined with each other to obtain one or more new numerical ranges, which should be considered to be specifically disclosed herein.

Claims

1. A polymer composite coil, characterized in that: The polymer composite coil includes a heat-reflecting layer, a first waterproof and heat-insulating layer, a temperature-regulating layer, a second waterproof and heat-insulating layer, and a gravel layer stacked in sequence, wherein the raw material formulas of the first waterproof and heat-insulating layer and the second waterproof and heat-insulating layer respectively include thermoplastic polyolefin elastomer and heat-expandable microspheres, and the temperature-regulating layer includes polyester fiber mesh cloth, a phase change material filled in the polyester fiber mesh cloth, and phase change microcapsules modified on the surface of the polyester fiber mesh cloth.

2. The polymer composite coil according to claim 1, characterized in that: The phase-change microcapsule is a core-shell structure, the shell layer is melamine, silicon dioxide, polyurea, polyurethane, polyimide or polymethyl methacrylate, and the core layer is a phase-change material.

3. The polymer composite coil according to claim 1, characterized in that: The phase change material filled in the polyester fiber mesh cloth is a combination of one or more of polyethylene glycol, octadecane, eicosane, and hydrocarbon paraffin.

4. The polymer composite coil according to claim 1, characterized in that: The heat-expandable microspheres are polymer microspheres with a core-shell structure, wherein the shell layer is polyacrylate and the core layer is an alkane compound with a boiling point below 100° C. The diameter of the heat-expandable microspheres before expansion is 10 to 50 μm.

5. The polymer composite coil according to claim 4, characterized in that: The wall thickness of the heat-expandable microspheres before expansion is 1.5-2.5 μm, the wall thickness after expansion is 0.05-0.15 μm, and the expansion temperature is 75-260°C.

6. The polymer composite coil according to any one of claims 1 to 5, characterized in that: In the first waterproof and heat-insulating layer and the second waterproof and heat-insulating layer, the mass ratio of the thermoplastic polyolefin elastomer to the heat-expandable microspheres is 2.5 to 5:1; and / or in the first waterproof and heat-insulating layer and the second waterproof and heat-insulating layer, the thermoplastic polyolefin elastomer is a propylene-ethylene copolymer elastomer.

7. The polymer composite coil according to claim 6, characterized in that: The raw material formula of the first waterproof and heat-insulating layer and the second waterproof and heat-insulating layer further includes an ultraviolet shielding agent and a heat stabilizer; and / or, The raw material formulas of the first waterproof and heat-insulating layer and the second waterproof and heat-insulating layer respectively include, by weight: 40-50 parts of thermoplastic polyolefin elastomer; 10-15 parts of heat-expandable microspheres; 0.1-0.3 parts of UV shielding agent; 0.1 to 0.3 parts of heat stabilizer.

8. The polymer composite coil according to any one of claims 1 to 5, characterized in that: The raw material formula of the heat reflection layer includes thermoplastic elastomer, heat insulation filler and reflective filler, and the mass ratio of the thermoplastic elastomer, heat insulation filler and reflective filler is 10:1-2.5:1-2.

6.

9. The polymer composite coil according to claim 8, characterized in that: In the heat reflection layer, the thermoplastic elastomer is a thermoplastic polyolefin elastomer and SEBS in a mass ratio of 1 to 3:1; or The raw material formula of the heat reflection layer includes the following components in parts by weight: SEBS 40-55 parts; 20-30 parts of propylene-ethylene copolymer elastomer; 10-15 parts of thermal insulation filler; 10-16 parts of reflective filler; 5-15 parts of flame retardant; 0.1-0.3 parts of UV shielding agent; 0.1-0.2 parts of antioxidant; 0.1 to 0.3 parts of light stabilizer.

10. The polymer composite coil according to claim 9, characterized in that: The reflective filler is reflective titanium dioxide and other reflective fillers in a mass ratio of 1:0.5 to 2, and the other reflective fillers include a combination of one or more metal sulfides and metal oxides; and / or the thermal insulation filler is surface-modified hollow microspheres.

11. The polymer composite coil according to claim 1, characterized in that: The gravel layer is formed by laying anti-sticking sand on the surface of hot-melt acrylic pressure-sensitive adhesive, and the particle size of the anti-sticking sand is 30-120 meshes.

12. The polymer composite coil according to claim 1, characterized in that: The thickness ratio of the heat reflection layer, the first waterproof and heat-insulating layer, the temperature regulating layer, the second waterproof and heat-insulating layer and the gravel layer is 1-6:5-10:6-10:5-10:1-6, and the total thickness of the polymer composite coil is 0.9-2 mm.

13. The method for preparing a polymer composite coil according to any one of claims 1 to 12, characterized in that: The raw materials of the heat reflective layer include SEBS, thermoplastic polyolefin elastomer, thermal insulation filler, reflective filler, flame retardant, ultraviolet shielding agent, antioxidant and light stabilizer; the raw materials of the first waterproof and heat-insulating layer and the second waterproof and heat-insulating layer respectively include thermoplastic polyolefin elastomer, heat-expandable microspheres, ultraviolet shielding agent and heat stabilizer. The preparation method comprises the following steps: Step S1, extruding and granulating SEBS and thermoplastic polyolefin elastomer, and then mixing them with thermal insulation filler and reflective filler to obtain a mixture; Step S2, mixing the mixture obtained in step S1 with a flame retardant, a UV shielding agent, an antioxidant, and a light stabilizer, extruding through an extruder, pulling, and cooling to obtain a heat-reflective polymer sheet; Step S3, mixing a thermoplastic polyolefin elastomer, heat-expandable microspheres, a UV shielding agent, and a heat stabilizer, and then co-extruding the mixture onto both sides of the temperature-regulating layer, rolling the mixture into a composite, and cooling the composite to obtain a polymer composite sheet including a first waterproof and heat-insulating layer, a temperature-regulating layer, and a second waterproof and heat-insulating layer stacked in sequence; Step S4, hot-pressing the heat-reflective polymer sheet obtained in step S2 and the polymer composite sheet obtained in step S3 to obtain a polymer composite sheet including a heat-reflective layer, a first waterproof and heat-insulating layer, a temperature-regulating layer, and a second waterproof and heat-insulating layer stacked in sequence; Step S5, coating the second waterproof and heat-insulating layer of the polymer composite sheet obtained in step S4 with a hot melt pressure-sensitive adhesive, then laying anti-sticking sand, roller-forming, and cooling to obtain the polymer composite coil.

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