Colored coating steel plate for metal surface heat insulation sandwich panel

Abstract

The utility model discloses a color coating steel plate for a metal surface heat insulation sandwich panel, and relates to the technical field of metal surface heat insulation sandwich panels. The color coating steel plates are connected to the two sides of the metal face heat insulation sandwich plate respectively. The device is characterized by comprising a substrate; the side, facing the outside, of the base plate is sequentially coated with a front plating layer, a first chemical conversion layer and a front coating. The side, facing the interior, of the base plate is sequentially coated with a reverse side plating layer, a second chemical conversion layer and a bonding coating. The weight of the front plating layer is larger than that of the back plating layer, so that a thickness difference plating layer is formed between the front plating layer and the back plating layer, and the thickness difference value range of the front plating layer and the back plating layer is 50-70 microns; the weight of the plating layer is prepared by inclining towards the outer side with a worse corrosion environment, and the reasonable configuration of the plating layer with different thicknesses can effectively prolong the service life of the metal surface heat insulation sandwich panel.

Description

Technical Field

[0001] This utility model belongs to the technical field of metal-faced heat-insulating sandwich panels, specifically relating to a color-coated steel plate for metal-faced heat-insulating sandwich panels. Background Technology

[0002] Metal-faced insulated sandwich panels consist of a core material and color-coated steel sheets on both sides of the core material. The color-coated steel sheets are produced by continuously coating the pre-treated core material with organic paint, followed by baking and curing. This process gives the metal-faced insulated sandwich panels architectural properties such as thermal insulation, fire resistance, and wind resistance, making them widely applicable in wall and roof systems for numerous buildings, including industrial plants and public buildings. However, existing metal-faced insulated sandwich panels lack specialized coating formulations for sandwich panels. Currently, the color-coated steel sheets used in metal-faced insulated sandwich panels in the construction industry are selected based on the national standard GB / T 2518, which recommends nominal coating types and weights for continuously hot-dip galvanized and zinc alloy coated steel sheets and strips. Except for a few low-thickness galvanized coatings, the rest are all uniform thickness coatings.

[0003] For panels already installed on walls and in use, the external color-coated steel panels are subjected to harsh environmental conditions such as long-term exposure to sunlight (e.g., temperatures up to 80℃), rain, wind, and diurnal temperature variations. Meanwhile, the internal color-coated steel panels are in an indoor environment (e.g., a temperature maintained at 20℃). Due to their long-term exposure to complex environments, they are prone to deformation due to the influence of ambient temperature. When the internal and external color-coated steel panels of the metal-faced insulated sandwich panels are exposed to heat from sunlight on one side or in a localized area, a significant temperature difference occurs between the two panels, resulting in uneven thermal expansion and contraction. This causes temperature deformation, causing the panels to change from a straight shape to an arched shape before installation. The fixing joints of the panels cannot withstand the safety test, the structural strength decreases, making installation difficult or even impossible. This also significantly reduces the overall aesthetics of the building. Utility Model Content

[0004] This utility model provides a color-coated steel plate for metal-faced thermal insulation sandwich panels, which solves the problem of uneven heating between the inner and outer color-coated steel plates of existing metal-faced thermal insulation sandwich panels, resulting in temperature deformation and reduced safety performance of the metal-faced thermal insulation sandwich panels.

[0005] The technical solution adopted in this utility model is as follows:

[0006] A color-coated steel sheet for a metal-faced thermal insulation sandwich panel is provided, wherein the color-coated steel sheet is connected to both sides of the metal-faced thermal insulation sandwich panel; the panel includes a substrate; the outer side of the substrate is sequentially coated with a front plating layer, a first chemical conversion layer, and a front coating layer; the inner side of the substrate is sequentially coated with a reverse plating layer, a second chemical conversion layer, and an adhesive coating layer; the plating weight of the front plating layer is greater than the plating weight of the reverse plating layer, such that a differential thickness plating layer is formed between the front plating layer and the reverse plating layer, wherein the thickness difference between the front plating layer and the reverse plating layer ranges from 50 to 70 μm.

[0007] The color-coated steel sheet used in the metal-faced heat-insulating sandwich panel of this utility model also has the following additional technical features:

[0008] The front coating weight is 80-120g / m². 2 The weight of the reverse coating is 30-70 g / m. 2 .

[0009] The front coating uses aluminum-zinc plating with an AZ content of 100g / m². 2 The reverse coating uses an aluminum-zinc AZ coating with a strength of 50 g / m². 2 Alternatively, the front coating may be made of aluminum-zinc-magnesium (AZM) with a coating strength of 100 g / m³. 2 The reverse coating uses aluminum zinc magnesium AZM with a concentration of 50 g / m 2 Alternatively, the front coating may be zinc plated with a Z of 180 g / m². 2 The reverse coating uses zinc plating with a Z value of 90 g / m. 2 .

[0010] The substrate has a thickness of not less than 0.5 mm, a wave height of ≤4 mm, and a steepness of ≤3%.

[0011] The first chemical conversion layer is made of passivated chromate or phosphate; or, the second chemical conversion layer is made of passivated chromate or phosphate.

[0012] The thickness of the first chemical conversion layer and the second chemical conversion layer ranges from 1 to 2 μm.

[0013] The front coating includes a primer layer and a topcoat layer; the primer layer is coated on the outside of the first chemical conversion layer, and the topcoat layer is coated on the outside of the primer layer.

[0014] The primer layer is made of polyvinylidene fluoride (PVDF), high weather-resistant polyester (HDP), or reinforced polyester (SRP), with a thickness of 5-7 μm; the topcoat layer is made of polyvinylidene fluoride (PVDF), high weather-resistant polyester (HDP), or reinforced polyester (SRP), with a thickness of 20-25 μm.

[0015] The primer layer and the topcoat layer also contain heat-insulating and reflective pigments; the heat-insulating and reflective pigments include titanium dioxide or flake aluminum pigments coated with silica.

[0016] The primer layer and the topcoat layer also have a skeleton matrix; the skeleton matrix includes hollow glass microspheres or hollow ceramic microspheres.

[0017] Due to the adoption of the above technical solution, the beneficial effects achieved by this utility model are as follows:

[0018] 1. A color-coated steel sheet for a metal-faced thermal insulation sandwich panel of this application, wherein the outer side of the substrate is sequentially coated with a front coating, a first chemical conversion layer, and a front coating; the inner side of the substrate is sequentially coated with a reverse coating, a second chemical conversion layer, and an adhesive coating; the coating weight of the front coating is greater than that of the reverse coating, so that a differential thickness coating is formed between the front coating and the reverse coating, thereby achieving a coating weight biased towards the more corrosive outer environment without increasing costs. This reasonable configuration of differential thickness coating can effectively extend the service life of the metal-faced thermal insulation sandwich panel.

[0019] 2. As a preferred embodiment of this utility model, by adding heat-insulating and reflective pigments and a skeleton matrix to the front coating, the heat-insulating and reflective pigments enable the front coating to have temperature control and heat insulation functions, effectively reflecting the full spectrum of solar radiation energy from 300nm to 2500nm, especially the energy in the near-infrared wavelength band from 780nm to 2500nm (this band accounts for about 51% of the total solar radiation energy), and the resistance to temperature deformation reaches 35% to 55%, thereby significantly reducing the impact of deformation of the board caused by temperature factors such as solar radiation.

[0020] 3. In a preferred embodiment of this utility model, the wave height of the substrate is ≤4mm and the steepness is ≤3%. The metal-faced thermal insulation sandwich panel adopts an ultra-high flatness panel design to meet the flatness requirements of architectural aesthetics. Attached Figure Description

[0021] The accompanying drawings, which are included to provide a further understanding of the present invention and constitute a part of this invention, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings:

[0022] Figure 1 This is a structural schematic diagram of a color-coated steel plate for a metal-faced heat-insulating sandwich panel according to one embodiment of the present invention;

[0023] Figure 2 This is a schematic diagram of the primer layer of a metal-faced thermal insulation sandwich panel according to one embodiment of the present invention.

[0024] In the picture,

[0025] 1. Substrate; 2. Front plating layer; 3. First chemical conversion layer; 4. Primer layer; 5. Topcoat layer; 6. Back plating layer; 7. Second chemical conversion layer; 8. Adhesive coating layer; 9. Skeleton substrate. Detailed Implementation

[0026] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0027] Furthermore, it should be understood in the description of this utility model that the terms "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0028] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0029] In this invention, unless otherwise expressly specified and limited, the first feature "on" or "below" the second feature may be in direct contact with the first and second features, or indirect contact through an intermediate medium. In the description of this specification, references to terms such as "implementation," "example," "aspect," or "specific example" indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0030] To more clearly illustrate the overall concept of this utility model, a detailed description will be provided below with reference to the accompanying drawings.

[0031] This utility model relates to a color-coated steel plate for use in metal-faced thermal insulation sandwich panels, such as... Figure 1-2 As shown, color-coated steel sheets are connected to both sides of the metal-faced heat-insulating sandwich panel; including a substrate 1; the outer side of the substrate 1 is sequentially coated with a front plating layer 2, a first chemical conversion layer 3, and a front coating layer; the inner side of the substrate 1 is sequentially coated with a reverse plating layer 6, a second chemical conversion layer 7, and an adhesive coating layer 8; the plating weight of the front plating layer 2 is greater than the plating weight of the reverse plating layer 6, so that a differential thickness plating layer is formed between the front plating layer 2 and the reverse plating layer 6, and the thickness difference between the front plating layer 2 and the reverse plating layer 6 ranges from 50 to 70 μm.

[0032] like Figure 1 As shown in the figure, the side at the top of the substrate 1 is the side facing outwards, which can be understood as the side exposed to sunlight. The side at the bottom of the substrate 1 is the side facing inwards, which can be understood as the side closer to the core material. In practical applications, the color-coated steel sheet on the side of the core material facing sunlight is affected by sunlight, rain, wind, and temperature differences between day and night for a long time, while the color-coated steel sheet on the inner side of the core material is less affected by indoor temperature. Therefore, it is easy for a temperature difference to exist between the outer and inner color-coated steel sheets, resulting in deformation and arching. This not only affects the aesthetics but, more importantly, affects the safety performance of the entire metal-faced thermal insulation sandwich panel. Therefore, in order to reduce the deformation between the inner and outer color-coated steel plates, this application sets the color-coated steel plate to include a substrate 1, a front plating layer 2, a first chemical conversion layer 3, a front coating layer, a back plating layer 6, a second chemical conversion layer 7, and an adhesive coating layer 8; wherein the side of the substrate 1 facing the sun is connected from the inside to the outside with the front plating layer 2, the first chemical conversion layer 3, and the front coating layer, and the side of the substrate 1 facing the core material is connected from the outside to the inside with the back plating layer 6, the second chemical conversion layer 7, and the adhesive coating layer 8.

[0033] In addition, by making the coating weight of the front coating 2 greater than that of the back coating 6, a differential thickness coating is formed between the front coating 2 and the back coating 6. This allows the coating weight to be tilted towards the outside, where the corrosive environment is more severe, without increasing the cost. This reasonable configuration of the differential thickness coating can effectively extend the service life of color-coated steel plates and metal-faced thermal insulation sandwich panels.

[0034] Existing metal-faced insulated sandwich panels lack specialized coating formulations. Currently, the color-coated steel sheets used in metal-faced insulated sandwich panels in the construction industry are selected based on the national standard GB / T 2518 for recommended nominal coating types and weights for continuously hot-dip galvanized and zinc alloy coated steel sheets and strips. Except for a few low-end galvanized differential thickness coatings, the rest are all uniform thickness coatings. However, for the outer color-coated steel sheet used in metal-faced insulated sandwich panels, the environments inside and outside the steel sheet are significantly different. The outer side of the steel sheet (sun side) must withstand harsh environmental conditions such as sunlight (including ultraviolet rays), rain, wind, and diurnal temperature differences, while the inner side of the steel sheet (core material side) is glued to the core material and operates in a very low-level environment. The temperature difference between the inner and outer steel sheets is significant, and using uniform thickness coatings is unreasonable. Therefore, this application addresses industry pain points in the application of metal-faced thermal insulation sandwich panels for buildings, such as the formulation of differential thickness coatings for metal-faced thermal insulation sandwich panels and the setting of ultra-high flatness panel types for metal-faced thermal insulation sandwich panels, and develops color-coated steel plates specifically for metal-faced thermal insulation sandwich panels.

[0035] As a preferred embodiment, the front coating 2 has a weight of 80-120 g / m². 2 The reverse coating weighs 30-70g / m². 2 By setting the weights of the front coating 2 and the back coating 6 to be unequal, with the front coating 2 having a higher weight than the back coating 6, the thickness of the front coating 2 is made greater than that of the back coating 6. This creates a thickness difference between the front and back coatings, allowing the coating thickness of the outer color-coated steel sheet to be greater than that of the inner color-coated steel sheet. This allows more of the coating from the inner color-coated steel sheet, which is in a lower corrosion environment, to be applied to the outer color-coated steel sheet, which is in a higher corrosion environment. This optimizes the coating configuration while keeping the overall thickness of the front and back coatings 6 constant. Preferably, the weight of the front coating 2 is 100 g / m². 2 The reverse coating 6 weighs 50g / m 2 .

[0036] In addition to using a differential thickness coating of aluminum-zinc, the front coating 2 or the back coating 6 can also use a differential thickness coating of aluminum-zinc-magnesium, or even a differential thickness coating of zinc. Therefore, as a preferred embodiment, the front coating 2 uses an aluminum-zinc coating with an AZ of 100 g / m². 2 The reverse coating 6 uses aluminum-zinc AZ with a strength of 50g / m². 2 Alternatively, the front coating 2 uses aluminum-zinc-magnesium (AZM) plating with a concentration of 100 g / m². 2 The reverse coating 6 uses aluminum zinc magnesium AZM with a strength of 50g / m 2 Alternatively, the front coating 2 uses zinc plating with a Z value of 180g / m². 2The reverse coating 6 uses zinc plating with a Z value of 90g / m. 2 .

[0037] In a preferred embodiment, the thickness of substrate 1 is not less than 0.5 mm, the wave height is ≤4 mm, and the steepness is ≤3%. The yield strength of substrate 1 is generally not less than 300 MPa. Substrate 1 is made of cold-rolled steel sheet, and the steel sheet strength is selected from commonly used industry grades such as DX51D or S300GD and above. The wave height of the substrate is ≤4 mm, the steepness is ≤3%, and the metal-faced thermal insulation sandwich panel adopts an ultra-high flatness panel design to meet the flatness requirements of architectural aesthetics.

[0038] In addition, the substrate 1 of the color-coated steel sheet can also be made into a structural plate with alternating grooves and protrusions. On the bonding surface where the core material is bonded to the substrate 1, a structural plate is made with protrusions corresponding to the grooves of the substrate 1 and recesses corresponding to the protrusions, so that the grooves and protrusions are connected to each other, and the recesses and protrusions are connected to each other, thereby further enhancing the connection strength between the substrate 1 and the core material and improving the stability of the connection.

[0039] In a preferred embodiment, the first chemical conversion layer 3 is a passivated chromate or a phosphate treated with phosphating; or, the second chemical conversion layer 7 is a passivated chromate or a phosphate treated with phosphating.

[0040] The purpose of setting the first chemical conversion layer 3 is to enhance the adhesion between the front plating layer 2 and the primer layer 4 in the front coating. Similarly, the purpose of setting the second chemical conversion layer 7 is to enhance the adhesion between the reverse plating layer 6 and the adhesive coating 8.

[0041] Preferably, the thickness of the first chemical conversion layer 3 and the second chemical conversion layer 7 ranges from 1 to 2 μm.

[0042] In a preferred embodiment, the front coating includes a primer layer 4 and a topcoat layer 5; the primer layer 4 is coated on the outside of the first chemical conversion layer 3, and the topcoat layer 5 is coated on the outside of the primer layer 4.

[0043] The thermal performance requirements for primer layer 4 and topcoat layer 5 are as follows: when the lightness value L≥80, the reflectance in the near-infrared band (780nm~2500nm) ≥80%, the solar reflectance ≥65%, and the thermal insulation temperature difference ≥15℃. Additionally, the front coating can achieve hydrophilic self-cleaning function by changing the surface tension of the coating; the color difference ΔE value against carbon black contamination should not exceed 1.0, and the contact angle should not exceed 60°; it can also achieve multi-angle low-gloss function by adding matting agents, with a 60° gloss of 5±5 GU.

[0044] Furthermore, the topcoat layer 5 is designed to ensure that the service life of the metal-faced thermal insulation sandwich panel is not less than L5 level (i.e., >20 years), meaning that the service life of the metal surface of the metal-faced thermal insulation sandwich panel is not less than 20 years. For example, the topcoat layer 5 can be made of polyvinylidene fluoride (PVDF) system with a thickness of 20~25μm.

[0045] The primer layer 4 uses a coating system compatible with the topcoat layer 5. When the topcoat layer 5 uses a polyvinylidene fluoride (PVDF) system, the primer layer 4 uses a matching PVDF system with a thickness of 5~7μm. Furthermore, when the topcoat layer uses high-weather-resistant polyester (HDP), the primer layer uses high-weather-resistant polyester (HDP); when the topcoat layer uses a reinforced polyester (SRP) system, the primer layer uses reinforced polyester (SRP).

[0046] Furthermore, the primer layer 4 and the topcoat layer 5 also contain heat-insulating and reflective pigments; the heat-insulating and reflective pigments include titanium dioxide or flake aluminum pigments coated with silica.

[0047] Furthermore, in addition to heat-insulating and reflective pigments, a framework matrix 9 is also added to the primer layer 4 and the topcoat layer 5. The framework matrix 9 is embedded within the primer layer 4 and the topcoat layer 5, which contain heat-insulating and reflective pigments. The framework matrix 9 includes hollow glass microspheres or hollow ceramic microspheres. Moreover, the framework matrix 9 can also have a sheet-like, columnar, or cuboid structure, or it can have a granular structure, depending on the specific requirements.

[0048] By adding functional heat-reflective pigments and a skeleton matrix 9, the temperature control function is further improved, enabling the metal-faced heat-insulating sandwich panel to meet the thermal performance requirements. When the brightness value L≥80, it can effectively reflect the full spectrum of solar radiation energy from 300nm to 2500nm, with a reflectance ≥80%, a solar reflectance ≥65%, a heat insulation temperature difference ≥15℃, and a resistance to temperature deformation of 35%~55%. This significantly reduces the impact of panel deformation caused by temperature factors such as solar radiation.

[0049] As the innermost layer of the structure, the adhesive coating 8 needs to be bonded to the core material because the color-coated steel sheet is made of steel. Therefore, the adhesive coating 8 needs to have good adhesive or foaming bonding function to ensure that it meets the requirement of bonding strength ≥0.1MPa for metal-faced thermal insulation sandwich panels for buildings. The coating system generally selected for the adhesive coating 8 is an epoxy resin system or a modified polyester system.

[0050] In practical applications, the actual products using the differential thickness coating AZ100 / 50 have a 30-year warranty against punctures and a temperature deformation resistance of 35% to 55%, while the previous equal thickness coating AZ150 (also known as AZ75 / 75) had a 20-year warranty against punctures. This application increases the service life by 50% without increasing costs.

[0051] For any parts not mentioned in this utility model, existing technologies can be used or referenced.

[0052] The various embodiments in this specification are described in a progressive manner. The same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on describing the differences from other embodiments.

[0053] The above description is merely an embodiment of this utility model and is not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of this utility model should be included within the scope of the claims of this utility model.

Claims

1. A color-coated steel sheet for a metal-faced thermal insulation sandwich panel, wherein the color-coated steel sheet is respectively connected to both sides of the metal-faced thermal insulation sandwich panel; characterized in that, The substrate includes a front plating layer, a first chemical conversion layer, and a front coating layer, which are sequentially coated on the outer side of the substrate; and a back plating layer, a second chemical conversion layer, and an adhesive coating layer, which are sequentially coated on the inner side of the substrate; the plating weight of the front plating layer is greater than that of the back plating layer, so that a differential thickness plating layer is formed between the front plating layer and the back plating layer, and the thickness difference between the front plating layer and the back plating layer is in the range of 50-70 μm.

2. The color-coated steel sheet for a metal-faced thermal insulation sandwich panel according to claim 1, characterized in that, The front coating weight is 80-120g / m². 2 The weight of the reverse coating is 30-70 g / m. 2 .

3. The color-coated steel sheet for a metal-faced thermal insulation sandwich panel according to claim 2, characterized in that, The front coating uses aluminum-zinc plating with an AZ concentration of 100 g / m². 2 The reverse coating uses an aluminum-zinc AZ coating with a strength of 50 g / m². 2 ; Alternatively, the front coating may be made of aluminum-zinc-magnesium (AZM) with a coating strength of 100 g / m. 2 The reverse coating uses aluminum zinc magnesium AZM with a concentration of 50 g / m 2 ; Alternatively, the front coating may be zinc plated with a Z of 180 g / m. 2 The reverse coating uses zinc plating with a Z value of 90 g / m. 2 .

4. The color-coated steel sheet for a metal-faced thermal insulation sandwich panel according to claim 1, characterized in that, The substrate has a thickness of not less than 0.5 mm, a wave height of ≤4 mm, and a steepness of ≤3%.

5. The color-coated steel sheet for a metal-faced thermal insulation sandwich panel according to claim 1, characterized in that, The first chemical conversion layer is made of passivated chromate or phosphate treated with phosphating; Alternatively, the second chemical conversion layer may be a passivated chromate or a phosphate treated with phosphating.

6. The color-coated steel sheet for a metal-faced thermal insulation sandwich panel according to claim 5, characterized in that, The thickness of the first chemical conversion layer and the second chemical conversion layer ranges from 1 to 2 μm.

7. The color-coated steel sheet for a metal-faced thermal insulation sandwich panel according to claim 1, characterized in that, The front coating includes a primer layer and a topcoat layer; the primer layer is coated on the outside of the first chemical conversion layer, and the topcoat layer is coated on the outside of the primer layer.

8. The color-coated steel sheet for a metal-faced thermal insulation sandwich panel according to claim 7, characterized in that, The primer layer is made of polyvinylidene fluoride (PVDF), high weather-resistant polyester (HDP), or reinforced polyester (SRP), with a thickness of 5-7 μm; the topcoat layer is made of polyvinylidene fluoride (PVDF), high weather-resistant polyester (HDP), or reinforced polyester (SRP), with a thickness of 20-25 μm.

9. A color-coated steel sheet for a metal-faced thermal insulation sandwich panel according to claim 8, characterized in that, The primer layer and the topcoat layer also contain heat-insulating and reflective pigments; the heat-insulating and reflective pigments include titanium dioxide or flake aluminum pigments coated with silica.

10. A color-coated steel sheet for a metal-faced thermal insulation sandwich panel according to claim 9, characterized in that, The primer layer and the topcoat layer also have a skeleton matrix; the skeleton matrix includes hollow glass microspheres or hollow ceramic microspheres.

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