Composite material electric heating floor and method of manufacturing the same

Abstract

The application discloses a composite material electric heating floor and a manufacturing method thereof, which comprises, from bottom to top, a bottom glass fiber skin, an intermediate core layer, a graphene sheet heating layer and a surface glass fiber skin; the intermediate core layer is an epoxy resin bonded phenolic resin laminated structure; the graphene sheet heating layer is a two-dimensional carbon nanometer material, the thickness of the graphene sheet heating layer is 0.8mm-1.2mm, and the graphene sheet heating layer is in a hexagonal honeycomb lattice shape. The special structure of the graphene sheet heating layer in the hexagonal honeycomb lattice shape makes the energy transmission more concentrated in the light wave radiation heating process after the floor is electrified, the temperature can be effectively controlled between 35 DEG C and 45 DEG C, the purpose of reducing the temperature difference is achieved, the composite material electric heating floor meets the application of the rail transit heating floor, and the structure stability of the intermediate core layer under the high-temperature condition can be ensured, the floor is prevented from generating gas due to heating, and the bulging phenomenon is avoided.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of electric heating floor, and particularly relates to a composite material electric heating floor and a manufacturing method thereof. BACKGROUND

[0002] Currently, the track traffic usually uses the traditional composite material floor, which does not have the electric heating function, and the traditional air conditioning heating mode is adopted. Since the warm air is lighter, it is suspended above the carriage, so that the phenomenon of "hot head and cold feet" is easily caused, the temperature distribution is uneven, and the passenger heating comfort is poor.

[0003] In the related art, the existing heating floor usually uses a carbon fiber heating cable, adopts long fiber carbon fiber as a base material, and uses four layers of insulation materials outside the base material for protection. The heating is performed by using light wave radiation. After being powered on, the heating temperature is unstable, and the heating temperature is operated in the temperature range of 40 DEG C-60 DEG C. The temperature difference is up to 20 DEG C. In the civil heating floor, this temperature difference can be accepted. However, in the heating floor on the track traffic, according to the EN13129-2016 standard requirement, the temperature difference needs to be controlled within 10 DEG C to meet the actual application of the track traffic heating floor. At the same time, the upper and lower skins, the middle core layer and the heating assembly of the existing heating floor are generally bonded by using two-component polyurethane. The two-component polyurethane reacts with water molecules in the air to produce gas CO2, which easily causes the base material to bulge, and seriously affects the mechanical strength of the heating floor. SUMMARY

[0004] The purpose of the present application is to provide a composite material electric heating floor and a manufacturing method thereof to solve at least one aspect of the problems and defects in the background art.

[0005] Specifically, the present application discloses a composite material electric heating floor, which comprises, from bottom to top, in sequence:

[0006] a bottom glass fiber skin, a middle core layer, a graphene sheet heating layer and a surface glass fiber skin;

[0007] The middle core layer is a phenolic resin laminated structure bonded by epoxy resin.

[0008] The graphene sheet heating layer is a two-dimensional carbon nanometer material, the thickness thereof is 0.8mm-1.2mm, preferably 1mm, and the graphene sheet heating layer is in the form of hexagonal honeycomb lattice.

[0009] The graphene sheet heating layer of the composite material electric heating floor uses graphene base material as a carrier for heating. The graphene is a carbon allotrope, and the carbon atoms are arranged in sp 2The hybrid bond forms a single-layer hexagonal honeycomb lattice graphene, so that the graphene heating layer has super-high electrical conductivity and stability, heat can be quickly and uniformly conducted, ensuring the rapid heating and uniform heating of the floor, and the non-metal material has high toughness and strength, preventing the risk of breakage, ensuring the structural stability and service life of the floor; at the same time, due to the special structure of the graphene sheet heating layer in the form of a hexagonal honeycomb lattice, the energy transfer is more concentrated during the light wave radiation heating process after the floor is powered on, and the temperature can be effectively controlled between 35℃-45℃, compared with traditional carbon fiber heating, the temperature control of the graphene sheet heating layer is more stable and efficient, which realizes the purpose of reducing temperature difference, and ensures that the composite material electric heating floor meets the application of rail transit heating floor.

[0010] The intermediate core layer of the composite material electric heating floor adopts a phenolic resin laminated structure bonded by epoxy resin, which can effectively improve the thermosetting of the foaming material, ensure the structural stability of the intermediate core layer under high temperature conditions, prevent the floor from generating gas when heated, thereby causing the bulging phenomenon, improve the heating stability and reliability of the floor, and can effectively prevent water and fire, effectively prevent moisture from penetrating into the floor, prevent moisture from affecting the performance and service life of the floor, and at the same time, prevent the safety hazard of fire caused by current leakage or short circuit, and improve the use safety of the heating floor.

[0011] As a further scheme of the present application: the thickness of the intermediate core layer is 12mm-14mm, and a glass fiber reinforced layer is arranged on the upper surface thereof, the thickness of the glass fiber reinforced layer is 0.8mm-1.2mm, and the glass fiber reinforced layer is pressed from glass fiber and phenolic resin.

[0012] Since the thickness of the intermediate core layer is 12mm-14mm, preferably 13mm, a glass fiber reinforced layer is arranged on the upper surface thereof, the thickness of the glass fiber reinforced layer is 0.8mm-1.2mm, preferably 1mm, and the glass fiber reinforced layer is pressed from glass fiber and phenolic resin, the compressive strength of the intermediate core layer can be effectively enhanced, so that the intermediate core layer can withstand greater pressure and load, deformation and damage are reduced, and even if gas is generated in the intermediate core layer, the glass fiber reinforced layer can prevent the floor from bulging, further improving the structural stability and mechanical strength of the floor under heated conditions.

[0013] As a further scheme of the present application: further comprising an electrical system, one end of the electrical system is provided with a temperature controller.

[0014] Since the heating floor further comprises an electrical system, one end of the electrical system is provided with a temperature controller, the electrical system is connected with the graphene sheet heating layer to form a closed loop for heating, and the temperature of the heating floor can be accurately controlled through the temperature controller, when the temperature is greater than or equal to 45 DEG C, the graphene sheet heating layer is controlled to stop heating, and when the temperature is less than or equal to 35 DEG C, the graphene sheet heating layer is controlled to continue heating, so that the temperature is controlled between 35 DEG C and 45 DEG C, the temperature difference is avoided to be too large, and the use requirement of the heating floor of the rail transit is met.

[0015] As a further scheme of the present application, the intermediate core layer is provided with a pre-embedded groove on the upper surface, and the electrical system is embedded in the pre-embedded groove.

[0016] By providing the pre-embedded groove on the upper surface of the intermediate core layer and embedding the electrical system in the pre-embedded groove, the sound insulation, waterproof and flame retardant effects of the electrical system can be effectively achieved, the influence of external impact on the operation of the electrical system is prevented, the stability of the electrical system is improved, and the normal operation of the electrical system is ensured.

[0017] As a further scheme of the present application, the graphene sheet heating layer is coated with a graphene coating.

[0018] Since the graphene sheet heating layer is coated with the graphene coating, the heat conduction efficiency and the electrical conductivity of the graphene sheet heating layer can be effectively improved, so that the heat can be rapidly conducted and diffused, the temperature difference of the heating temperature at different positions of the floor caused by uneven temperature conduction is avoided to be too large, and the uniformity and consistency of the temperature conduction of the graphene sheet heating layer are effectively improved.

[0019] As a further scheme of the present application, a conductive copper strip is further provided, the conductive copper strip is laminated in the middle region of the graphene sheet heating layer and coupled with the graphene coating, and the conductive copper strip is connected with the electrical system.

[0020] By laminating the conductive copper strip in the middle region of the graphene sheet heating layer and coupling the conductive copper strip with the graphene coating, the conductive copper strip is connected with the electrical system for heating of the graphene sheet heating layer, and the conductive copper strip is seamlessly connected with the graphene coating, so that the transmission efficiency of the current of the conductive copper strip can be effectively improved, the heat can be rapidly conducted and diffused by the graphene sheet heating layer, the heat of the entire graphene sheet heating layer is uniformly distributed, the uniformity and consistency of the temperature conduction are ensured, the temperature difference of the heating temperature at different positions of the floor is reduced, and the use requirement of the heating floor of the rail transit is met.

[0021] As a further scheme of the present application, the thickness of the bottom glass fiber skin is 0.8mm-1.2mm, and the bottom glass fiber skin is pressed from glass fiber and phenolic resin.

[0022] The thickness of the bottom glass fiber skin is 0.8-1.2 mm, preferably 1 mm, and the bottom of the floor is effectively protected by pressing the glass fiber and phenolic resin, so that the bottom of the floor is more stable when bearing pressure and load, and the bending and deformation are reduced, and the thermosetting of the bottom of the floor is enhanced, so that the gas generated by the bottom of the floor is prevented, and the structure stability and use performance of the bottom of the floor under high temperature are ensured.

[0023] As a further aspect of the application: the thickness of the surface glass fiber skin is 1.8-2.2 mm, and the glass fiber and phenolic resin are pressed.

[0024] The thickness of the surface glass fiber skin is 1.8-2.2 mm, preferably 2 mm, and the top of the floor is effectively protected by pressing the glass fiber and phenolic resin, so that the top of the floor is more stable when bearing pressure and load, and the bending and deformation are reduced, and the thermosetting of the top of the floor is enhanced, so that the gas generated by the top of the floor is prevented, and the structure stability and use performance of the top of the floor under high temperature are ensured, and the thickness of the surface glass fiber skin can ensure the bearing capacity of the top of the floor, and prevent damage to the top of the floor due to excessive weight or impact force.

[0025] The second aspect of the application also discloses a manufacturing method of a composite material electric heating floor, comprising the following steps:

[0026] S1, mixing epoxy resin AB glue, coating on the surface of the bottom glass fiber skin, and manually pressing the intermediate core layer, and then laminating by vulcanizing machine;

[0027] S2, the intermediate core layer is carved by a carving machine, the electrical system is embedded in the embedded groove, and the conductive copper strip of the graphene sheet heating layer is connected;

[0028] S3, the graphene sheet heating layer is integrally coated with two-component epoxy resin AB glue, and is connected with the intermediate core layer;

[0029] S4, epoxy resin AB glue is coated on the surface of the glass fiber skin and the graphene sheet heating layer, and then laminated by vulcanizing machine after manual pressing;

[0030] S5, the whole floor is edge sealed.

[0031] As a further aspect of the application: further comprising the following steps:

[0032] S01, the bottom glass fiber skin 1 and the intermediate core layer 2 are pressed by a vulcanizing machine at a pressure of 4MPa and a high temperature of 130℃ for 25 minutes, or at room temperature for 1 hour;

[0033] S02, the bonding temperature of the graphene sheet heating layer 3 and the intermediate core layer 2 is 25℃, the bonding pressure is 800N, and the bonding time is 24h;

[0034] S03, the surface glass fiber skin 4 and the graphene sheet heating layer 3 are pressed by a vulcanizing machine at a pressure of 4MPa and a high temperature of 130℃ for 25 minutes, or at room temperature for 1 hour.

[0035] The manufacturing method of the composite material electric heating floor ensures the stable connection between the layers, enhances the mechanical strength of the entire heating floor structure, prevents delamination or peeling between the layers, ensures the structural stability and reliability of the heating floor, effectively improves the waterproof and flame retardant effect of the heating floor, ensures the use safety and service life of the heating floor, and reduces the temperature difference at different positions of the floor. The temperature difference can be effectively controlled within 10℃, the heat conduction efficiency and precise temperature control of the heating floor are improved, and the use requirements of the rail transit heating floor are met. BRIEF DESCRIPTION OF DRAWINGS

[0036] In order to facilitate the understanding of those skilled in the art, the present application will be further described below with reference to the accompanying drawings.

[0037] Figure 1 It is an exploded view of a composite material electric heating floor structure;

[0038] Figure 2 It is a schematic view of the intermediate core layer structure of a composite material electric heating floor;

[0039] Figure 3 It is a schematic view of the electric appliance system structure of a composite material electric heating floor;

[0040] Figure 4 It is a schematic view of the graphene sheet heating layer structure of a composite material electric heating floor;

[0041] Figure 5 It is a heating principle diagram of the graphene sheet heating layer of a composite material electric heating floor.

[0042] Reference signs:

[0043] 1, bottom glass fiber skin; 2, intermediate core layer; 21, pre-embedded groove; 3, graphene sheet heating layer; 4, surface glass fiber skin; 5, glass fiber reinforced layer; 6, electric appliance system; 61, temperature controller. DETAILED DESCRIPTION

[0044] In order to make the objects, technical solutions and advantages of the present application clearer, the technical solutions of the present application are further specifically explained below by embodiments and in conjunction with the drawings. In the description, identical or similar reference numerals indicate identical or similar components. The following description of the embodiments of the present application is intended to explain the general inventive concept of the present application, and should not be understood as a limitation of the present application.

[0045] In addition, in the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the embodiments of the present disclosure. It will be apparent, however, that one or more embodiments can be practiced without these specific details. In other instances, well-known structures and devices are illustrated in block diagram form in order to simplify the drawings.

[0046] As Figures 1-5 shown in the embodiments of the present application, a first aspect of the present application discloses a composite material electric heating floor, which comprises, from bottom to top, a bottom glass fiber skin 1, an intermediate core layer 2, a graphene sheet heating layer 3, and a surface glass fiber skin 4; the intermediate core layer 2 is a phenolic resin laminated structure bonded by epoxy resin; the graphene sheet heating layer 3 is a two-dimensional carbon nanometer material, with a thickness of 0.8mm-1.2mm and in a hexagonal honeycomb lattice shape.

[0047] The heating principle of the graphene sheet heating layer 3 is as follows: since graphene is an allotrope of carbon, carbon atoms are bonded in a single layer of hexagonal honeycomb lattice graphene by sp 2 hybrid bonds; among them, the carbon atom has 4 valence electrons, of which 3 valence electrons form sp 2 bonds, that is, each carbon atom contributes an unpaired electron on the pz orbital, and the pz orbitals of adjacent atoms are perpendicular to the plane to form π bonds, and the newly formed π bonds are in a semi-filled state.

[0048] Under the condition of power supply of the graphene sheet heating layer 3, carbon molecules in the electric heating film generate phonons, ions and electrons under the action of the electric field, and carbon atom groups in the heating body jump from low energy level to high energy level; after a short excitation state, they quickly return to a lower energy level, and the lost energy is radiated in the form of electric field and magnetic field energy package, at this time, thermal radiation (far infrared radiation) is formed. At the same time, the carbon atom groups produce violent friction and collision, and perform “Brownian motion”, which generates a large amount of heat energy, and the heat energy is radiated out in a planar manner through far infrared rays with a wavelength of 5um-14um; the special structure of the graphene sheet heating layer 3 in a hexagonal honeycomb lattice shape makes the light wave radiation energy transmission more concentrated, and the conversion rate of electric energy to heat energy is as high as 99.15% or more, and the heating temperature can be stably controlled between 35℃-45℃.

[0049] Specifically, the graphene sheet heating layer 3 of the composite material electric heating floor uses graphene substrate as a carrier to generate heat. The graphene is an allotrope of carbon, and the carbon atoms are bonded by sp 2 The single-layer hexagonal honeycomb lattice graphene is formed by hybrid bonding, so that the graphene sheet heating layer 3 has super-high electrical conductivity and stability, heat can be quickly and uniformly conducted, ensuring rapid heating and uniform heating of the floor, and the non-metal material has high toughness and strength, preventing the risk of fracture and ensuring the structural stability and service life of the floor. At the same time, due to the special structure of the graphene sheet heating layer 3 in the form of a hexagonal honeycomb lattice, energy transfer is more concentrated during the process of light wave radiation heating after the floor is powered on, and the temperature can be effectively controlled between 35℃-45℃. Compared with traditional carbon fiber heating, the temperature control of the graphene sheet heating layer 3 is more stable and efficient, which realizes the purpose of reducing temperature difference, and ensures that the composite material electric heating floor meets the application of rail transit heating floor.

[0050] The intermediate core layer 2 of the composite material electric heating floor adopts a phenolic resin laminated structure bonded by epoxy resin, which can effectively improve the thermosetting property of the foaming material, ensure the structural stability of the intermediate core layer 2 under high temperature conditions, prevent the floor from generating gas due to heating, thereby causing the phenomenon of bulging, improve the heating stability and reliability of the floor, and can effectively prevent water from penetrating into the floor, prevent moisture from affecting the performance and service life of the floor, and prevent the safety hazard of fire caused by current leakage or short circuit, thereby improving the use safety of the heating floor.

[0051] The following is the load-bearing performance test data of the heating floor of the present application, as shown in Table 1:

[0052]

[0053] Table 1

[0054] As can be seen, the heating floor passes the test of various bearing strengths, and the results meet the relative standard requirements, which can effectively bear heavy weight and resist local stress, ensuring the durability and reliability of the heating floor and meeting the mechanical strength requirements of the rail transit heating floor of the China Railway Bureau.

[0055] And in the test of bearing strength of 2400N, the deflection is only 0.001mm, because the surface glass fiber skin 4 of the heating floor is preferably composed of 8 layers of 0.25mm thick glass fiber cloth and phenolic resin, and the bottom glass fiber skin 1 is preferably composed of 4 layers of 0.25mm thick glass fiber cloth and phenolic resin, and glass fiber material is used in each layer of structure, which greatly increases the compressive strength and shear strength;

[0056] Meanwhile, the intermediate core layer 2 is changed from a traditional transverse laminated structure to a longitudinal laminated structure, which can effectively disperse and transfer stress, reduce the risk of material failure or rupture caused by stress concentration, effectively inhibit the bending and twisting deformation of the material when the heating floor is under pressure, greatly enhance the compressive strength, and increase the high-density sealing edge and epoxy plate interlayer at the connection, further strengthen the floor connection, so its deflection is much smaller than the actual requirement of 0.5mm, effectively improving the durability and service life of the heating floor.

[0057] In addition, the heating floor is subjected to a simulated long-life vibration test, a mechanical impact vibration test, and a functional random vibration test.

[0058] The long-life vibration test is performed in the vertical direction at 5.72m / s 2 , the horizontal direction at 2.55m / s 2 , and the longitudinal direction at 3.96m / s 2 , respectively. The test results are shown in Table 2.

[0059] Long life vibration test Vertical Lateral Longitudinal ASD values (m / s 2 ) 2 / Hz]]> 0.964 0.192 0.461 Root mean square value (m / s 2 )]]> 5.72 2.55 3.96 Vibration time (h) 5 5 5

[0060] Table 2

[0061] The mechanical impact test is performed at an acceleration peak of 30m / s 2 in the vertical direction, 30m / s 2 in the horizontal direction, and 50m / s 2 in the longitudinal direction, respectively. The test results are shown in Table 3.

[0062] Mechanical shock vibration test Vertical Lateral Longitudinal Shock waveform Half-sine wave Half-sine wave Half-sine wave Acceleration peak (m / s 2 )]]> 30 30 30 Pulse width (h) 30 30 30 Number of shocks (forward / reverse) 3 / 3 3 / 3 3 / 3

[0063] Table 3

[0064] The functional random vibration test is performed at 1.01m / s 2 in the vertical direction, 0.45m / s 2 in the horizontal direction, and 0.7m / s 2 in the longitudinal direction, respectively. The test results are shown in Table 4.

[0065] Long life vibration test Vertical Lateral Longitudinal ASD values (m / s 2 ) 2 / Hz]]> 0.0301 0.006 0.0144 Root mean square value (m / s 2 )]]> 1.01 0.45 0.7 Vibration time (h) 10 10 10

[0066] Table 4

[0067] As can be seen, the rail transit heating floor passes all vibration tests and can effectively resist external vibrations, reduce structural deformation or damage caused by vibrations, and reduce noise caused by vibrations, effectively improving the structural stability and use comfort of the rail transit heating floor, and meeting the requirements of IEC61373-2010 (Class B).

[0068] At the same time, the heating floor is subjected to heating fatigue strength test, and the test results all meet the standard. By adopting the two-dimensional carbon nanometer material and the graphene sheet heating layer 3 in the form of hexagonal honeycomb lattice, the temperature can be effectively controlled between 35℃-45℃, the heat of the entire graphene sheet heating layer 3 is evenly distributed, the uniformity and consistency of temperature conduction are ensured, the temperature difference of heating temperature at different positions of the floor is reduced, thereby meeting the use requirements of the rail transit heating floor. The specific test results are shown in Table 5:

[0069] Heat-up time Maximum temperature Minimum temperature Average temperature Day 1 32.6℃ 28.8℃ 30.5℃ Day 2 35.8℃ 28.5℃ 30.3℃ Day 3 31.1℃ 26.8℃ 28.9℃ Day 4 42.2℃ 34.5℃ 38.5℃ Day 7 33.7℃ 30.3℃ 32.2℃ Day 15 38.7℃ 30.5℃ 36.3℃ Day 30 38.7℃ 31.8℃ 36.5℃

[0070] Table 5

[0071] As can be seen, the graphene heating layer is subjected to continuous heating for 720h from the first day to the thirtieth day, and no heating attenuation and stability change is found, the heating temperature can be effectively kept stable, meeting the requirements of the electric heating floor fatigue strength.

[0072] Further, as shown in Figure 1 , the thickness of the intermediate core layer 2 is 12mm-14mm, and the upper surface of the intermediate core layer 2 is provided with a glass fiber reinforced layer 5, the thickness of the glass fiber reinforced layer 5 is 0.8mm-1.2mm, and the glass fiber reinforced layer 5 is pressed by glass fiber and phenolic resin.

[0073] Specifically, since the thickness of the intermediate core layer 2 is 12mm-14mm, preferably 13mm, the upper surface of the intermediate core layer 2 is provided with a glass fiber reinforced layer 5, the thickness of the glass fiber reinforced layer 5 is 0.8mm-1.2mm, preferably 1mm, and the glass fiber reinforced layer 5 is pressed by glass fiber and phenolic resin, the compressive strength of the intermediate core layer 2 can be effectively enhanced, the intermediate core layer 2 can withstand greater pressure and load, deformation and damage are reduced, and even if gas is generated in the intermediate core layer 2, the glass fiber reinforced layer 5 can prevent the floor from bulging, further improving the structural stability and mechanical strength of the floor under the heated state.

[0074] Further, as shown in Figure 3 , the heating floor further comprises an electric system 6, and the electric system 6 is provided with a temperature controller 61 at one end.

[0075] Specifically, since the heating floor further comprises an electric system 6, and the electric system 6 is provided with a temperature controller 61 at one end, the electric system 6 is connected with the graphene sheet heating layer 3 to form a closed loop for heating, and the temperature of the heating floor can be accurately controlled through the temperature controller 61, when the temperature is ≥45℃, the graphene sheet heating layer 3 is controlled to stop heating, and when the temperature is ≤35℃, the graphene sheet heating layer 3 is controlled to continuously heat, so as to ensure that the temperature is controlled between 35℃-45℃, and the temperature difference is avoided to be too large, thereby meeting the use requirements of the rail transit heating floor.

[0076] Further, as shown in the drawings, the upper surface of the intermediate core layer 2 is provided with a pre-embedded groove 21, and the electric appliance system 6 is embedded in the pre-embedded groove 21. Figure 2

[0077] Specifically, by providing the pre-embedded groove 21 on the upper surface of the intermediate core layer 2, and embedding the electric appliance system 6 in the pre-embedded groove 21, the sound insulation, waterproofing and flame retardant effects of the electric appliance system 6 can be effectively achieved, and the influence of external impact on the operation of the electric appliance system 6 can be prevented, thereby improving the stability of the electric appliance system and ensuring the normal operation of the electric appliance system 6.

[0078] Further, the graphene sheet heating layer 3 is coated with a graphene coating.

[0079] Specifically, since the graphene sheet heating layer 3 is coated with a graphene coating, the heat conduction efficiency and electrical conductivity of the graphene sheet heating layer 3 can be effectively improved, so that heat can be rapidly conducted and diffused, and the temperature difference between different positions of the floor caused by uneven temperature conduction can be avoided, thereby effectively improving the uniformity and consistency of temperature conduction of the graphene sheet heating layer 3.

[0080] Further, it further comprises a conductive copper strip, which is laminated in the middle region of the graphene sheet heating layer 3 and coupled with the graphene coating, and the conductive copper strip is connected with the electric appliance system 6.

[0081] Specifically, by laminating the conductive copper strip in the middle region of the graphene sheet heating layer 3 and coupling it with the graphene coating, and connecting the conductive copper strip with the electric appliance system 6, the conductive copper strip is used for heating of the graphene sheet heating layer 3, and the seamless connection between the conductive copper strip and the graphene coating can effectively improve the transmission efficiency of the current of the conductive copper strip, facilitate rapid heat conduction and diffusion of the graphene sheet heating layer 3, make the heat of the entire graphene sheet heating layer 3 uniformly distributed, ensure the uniformity and consistency of temperature conduction, and reduce the temperature difference of heating temperature at different positions of the floor, thereby meeting the use requirements of the rail transit heating floor.

[0082] According to the embodiment of the present application, the thickness of the bottom glass fiber skin 1 is 0.8-1.2mm, which is pressed by glass fiber and phenolic resin.

[0083] Specifically, since the thickness of the bottom glass fiber skin 1 is 0.8-1.2mm, preferably 1mm, and it is pressed by glass fiber and phenolic resin, the bottom of the floor can be effectively protected, so that the bottom of the floor is more stable when bearing pressure and load, and bending and deformation are reduced, and the thermosetting property of the bottom of the floor is enhanced, so that gas is prevented from being generated at the bottom of the floor due to heating, thereby preventing the floor from bulging, and ensuring the structural stability and use performance of the floor under high temperature.

[0084] ​According to the embodiment of the present application, the surface glass fiber skin 4 has a thickness of 1.8-2.2 mm, and is made of glass fiber and phenolic resin.

[0085] Specifically, since the surface glass fiber skin 4 has a thickness of 1.8-2.2 mm, preferably 2 mm, and is made of glass fiber and phenolic resin, the top of the floor can be effectively protected, the top of the floor is more stable when bearing pressure and load, bending and deformation are reduced, the top of the floor is enhanced, the top of the floor is prevented from being heated to generate gas, and the top of the floor is prevented from being bulged, the structural stability and use performance of the top of the floor under high temperature are ensured, and the thickness of the surface glass fiber skin 4 can ensure the bearing capacity of the top of the floor and prevent damage to the top of the floor caused by excessive weight or impact force.

[0086] The second aspect of the present application also discloses a manufacturing method of a composite material electric heating floor, comprising the following steps:

[0087] S1, mixing epoxy resin AB glue, coating on the surface of the bottom glass fiber skin 1, manually pressing with the intermediate core layer 2, and then laminating by vulcanizing machine;

[0088] S2, the intermediate core layer 2 is engraved by a carving and milling machine to form a pre-embedded groove 21, the electrical system 6 is embedded in the pre-embedded groove 21, and the conductive copper strip of the graphene sheet heating layer 3 is connected;

[0089] S3, the graphene sheet heating layer 3 is integrally coated with two-component epoxy resin AB glue and bonded with the intermediate core layer 2;

[0090] S4, epoxy resin AB glue is coated on the surface glass fiber skin 4 and the graphene sheet heating layer 3, and then laminated by vulcanizing machine after manual pressing;

[0091] S5, the whole floor is edge sealed.

[0092] Further, the following steps are further included:

[0093] S01, the bottom glass fiber skin 1 and the intermediate core layer 2 are pressed by the vulcanizing machine under the pressure of 4 MPa and the high temperature of 130 DEG C for 25 minutes, or under normal temperature for 1 hour;

[0094] S02, the bonding temperature of the graphene sheet heating layer 3 and the intermediate core layer 2 is 25 DEG C, the bonding pressure is 800 N, and the bonding is maintained for 24 hours;

[0095] S03, the surface glass fiber skin 4 and the graphene sheet heating layer 3 are pressed by the vulcanizing machine under the pressure of 4 MPa and the high temperature of 130 DEG C for 25 minutes, or under normal temperature for 1 hour.

[0096] Specifically, the manufacturing method of the composite material electric heating floor ensures the stable connection between the layers, enhances the mechanical strength of the entire heating floor structure, prevents delamination or peeling between the layers, and ensures the structural stability and reliability of the heating floor. It also effectively improves the waterproofing and flame retardant effect of the heating floor, ensuring the safety and service life of the heating floor, while reducing the temperature difference at different positions of the floor, effectively controlling the temperature difference within 10℃, improving the heat conduction efficiency and precise temperature control of the heating floor, and meeting the use requirements of the rail transit heating floor.

[0097] In addition, it should be noted that the total thickness of the composite material electric heating floor is preferably 18mm, and the surface density of the board is ≤8.4kg / m2, i.e. ≤462kg / m3, so that the density of the heating floor is relatively low, which is conducive to heat conduction, can quickly heat the floor to the set temperature, is beneficial to reduce the heating time and energy consumption, improves the thermal efficiency of the heating floor, and reduces the use cost.

[0098] The above specific embodiments further illustrate the purpose, technical solutions and advantages of the present application. It should be understood that the above description is only a specific embodiment of the present application and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A composite electrically heated floor, characterised in that, From bottom to top in turn includes: The bottom layer of glass fiber skin (1), the middle core layer (2), the graphene sheet heating layer (3) and the surface glass fiber skin (4); The middle core layer (2) is an epoxy resin bonded phenolic resin laminated structure; The graphene sheet heating layer (3) is a two-dimensional carbon nanometer material, the thickness is 0.8mm-1.2mm, and it is in hexagonal honeycomb lattice shape, the graphene sheet heating layer (3) is coated with a graphene coating; It also includes a conductive copper belt, which is laminated in the middle region of the graphene sheet heating layer (3) and coupled with the graphene coating; The manufacturing method of the composite material electric heating floor, comprising the following steps: S1, mix epoxy resin AB glue, coat on the surface of the bottom layer of glass fiber skin (1), manually press the middle core layer (2) after pressing, and laminate through the vulcanizing machine; S2, the upper surface of the middle core layer (2) is engraved by engraving machine, the electrical system (6) is embedded in the embedded groove (21), and is connected with the conductive copper belt of the graphene sheet heating layer (3); S3, the graphene sheet heating layer (3) is coated with two-component epoxy resin AB glue, and is bonded with the middle core layer (2); S4, coat epoxy resin AB glue on the surface of the surface glass fiber skin (4), and laminate through the vulcanizing machine after manually pressing the graphene sheet heating layer (3); S5, edge sealing treatment is carried out on the whole floor.

2. The composite electric heating floor according to claim 1, characterized in that, The thickness of the middle core layer (2) is 12mm-14mm, and the upper surface is provided with a glass fiber reinforced layer (5), the thickness of the glass fiber reinforced layer (5) is 0.8mm-1.2mm, and the glass fiber and phenolic resin are pressed.

3. The composite electric heating floor according to claim 2, characterized in that, The electrical system (6) is provided with a temperature controller (61) at one end.

4. The composite electric heating floor according to claim 1, characterized in that, The thickness of the bottom layer of glass fiber skin (1) is 0.8mm-1.2mm, and the glass fiber and phenolic resin are pressed.

5. The composite electric heating floor according to claim 1, characterized in that, The thickness of the surface glass fiber skin (4) is 1.8mm-2.2mm, and the glass fiber and phenolic resin are pressed.

6. The composite electric heating floor according to claim 1, characterized in that, It also includes the following steps: S01, the bottom layer of glass fiber skin (1) and the middle core layer (2) are pressed by the vulcanizing machine at a pressure of 4MPa and a high temperature of 130℃ for 25 minutes, or at room temperature for 1 hour; S02, the bonding temperature of the graphene sheet heating layer (3) and the middle core layer (2) is 25℃, the bonding pressure is 800N, and the bonding pressure is maintained for 24h; S03, the surface glass fiber skin (4) and the graphene sheet heating layer (3) are pressed by the vulcanizing machine at a pressure of 4MPa and a high temperature of 130℃ for 25 minutes, or at room temperature for 1 hour.

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