CN114032010A

CN114032010A - Color steel plate suitable for metal roof BIPV system

Info

Publication number: CN114032010A
Application number: CN202111308698.XA
Authority: CN
Inventors: 谭小春; 朱疆
Original assignee: Xian Longi Green Energy Architecture Technology Co Ltd
Current assignee: Longi Solar Technology Co Ltd
Priority date: 2021-11-05
Filing date: 2021-11-05
Publication date: 2022-02-11

Abstract

The present disclosure relates to a color steel plate, which comprises a finish paint layer, wherein the material of the finish paint layer contains a filler, and the filler comprises a flaky filler and a granular filler; wherein, the adding amount of the filler accounts for 20-50% of the total weight of the finish coat layer material; the addition amount of the flaky filler accounts for 20-40% of the weight percentage of the filler. The color steel plate is suitable for a metal roof BIPV system and has excellent adhesiveness, humidity resistance and adhesion.

Description

Color steel plate suitable for metal roof BIPV system

Technical Field

The disclosure relates to the field of building materials, in particular to a color steel plate suitable for a metal roof BIPV system.

Background

The color coated steel plate produced by coating the organic coating on the surface of steel in the steel industry has the advantages of beautiful appearance, bright color, high strength, good corrosion resistance, convenient processing and forming and the like, and is widely applied to roofs and wall surfaces of light steel structures in the building industry. Building Integrated Photovoltaics (BIPV) is a technology that integrates solar power (photovoltaic) products into buildings. With the background of the current dual carbon target, it will be the developing trend of future buildings to implement photovoltaic power generation on the surface of the buildings. The metal roof of the industrial factory building is very suitable for being combined with photovoltaic to form a BIPV roof due to large area and simple structure.

The organic coating on the surface of the color steel plate can lose luster, pulverization, peeling and other failures after long-term environmental aging such as illumination, temperature, humidity and the like, so that the coating loses the protective effect on the steel plate to cause corrosion and perforation of the steel plate, and after the color steel plate metal roof is combined with a photovoltaic, the environmental aging condition borne by the color steel plate metal roof is severer, for example, in hot summer, the temperature of most of slope roof photovoltaic components in the area is over 70 ℃ when working, and the temperature of the roof under the components is higher than that of the roof without the photovoltaic; in addition, due to the shielding effect of the modules, the wet time of the roof below the modules is longer after raining, thereby causing the color steel plates of the BIPV roof to bear severer wet heat aging. In order to verify the service reliability of the assembly, the photovoltaic industry performs damp-heat aging detection on the assembly according to the IEC 61215 standard, wherein the specific aging parameters are 85 ℃ and 85% RH, and the testing time is 1000h (hereinafter referred to as DH1000), while the aging parameters selected by the traditional damp-heat aging resistance test of the color steel plate are 38 ℃ and 100% RH, and the testing time is 1000h, and a large number of tests show that the color steel plate which passes the damp-heat aging resistance test of the color steel plate at present cannot pass the DH1000 test of the photovoltaic standard.

The color steel plate of the BIPV roof system is organically combined with the photovoltaic module in a bonding mode, so that the bonding reliability of the surface of the color steel plate and the structural adhesive is particularly important, a large number of tests show that the performance of the existing color steel plate is not considered during development and design, the interface stripping phenomenon between most of the color steel plate and the structural adhesive occurs after the color steel plate and the structural adhesive are bonded, and the interface stripping phenomenon can still occur during aging tests. If the BIPV roofing system is manufactured by using the existing color steel plate, the operation risk of the system is increased.

The patent with the publication number of CN 105315854A discloses a self-cleaning high-durability finish paint and a color coated steel plate coated with the same, wherein the added organosilicon hydrophilic auxiliary agent can provide a silicon-oxygen bond in the bonding process with the structural adhesive, the finish paint is bonded with the structural adhesive, although the finish paint has hydrophilicity, and water vapor can completely permeate into gaps and small holes of a paint film when the color coated steel plate is used in a high-humidity environment, so that the water blocking capacity of the finish paint layer is reduced. And after water vapor enters the interface between the adhesive and the finish paint, organic matters in the finish paint are hydrolyzed to reduce the bonding performance, so that the interface between the finish paint and the adhesive is peeled.

Disclosure of Invention

The purpose of the present disclosure is to provide a color steel sheet having excellent adhesiveness, moist heat resistance and adhesion, which is suitable for use in a metal roofing BIPV system.

In order to achieve the above object, the present disclosure provides a color steel plate, which includes a top paint layer, wherein the material of the top paint layer contains a filler, and the filler includes a flaky filler and a granular filler; wherein, the adding amount of the filler accounts for 20-50% of the total weight of the finish coat layer material; the addition amount of the flaky filler is 20-40% of the total weight of the filler.

Optionally, the adding amount of the filler accounts for 25-45% of the total weight of the finishing coat material; the addition amount of the flaky filler accounts for 25-35% of the total weight of the filler.

Optionally, the diameter of the plate-like filler is 50-120 microns, and the ratio of the diameter of the plate-like filler to the thickness of the plate-like filler is not less than 60.

Optionally, the diameter of the plate-like filler is 60-100 microns, and the ratio of the diameter of the plate-like filler to the thickness of the plate-like filler is not less than 80.

Optionally, the platy filler is selected from platy mica and/or stainless steel flakes.

Optionally, the finishing paint layer further contains resin, pigment, auxiliary agent and solvent;

based on the total weight of the finish paint layer, the addition amount of the resin is 35-55 wt%, the addition amount of the pigment is 0.1-5 wt%, the addition amount of the auxiliary agent is 5-15 wt%, and the addition amount of the solvent is 8-20 wt%;

optionally, the resin is selected from at least one of polyester resin, high weather resistant polyester, silicon modified polyester and polyvinylidene fluoride resin; the pigment is selected from iron oxide red and/or titanium yellow; the auxiliary agent is selected from an acrylic acid leveling agent and/or a polyvinylidene fluoride wax lubricant; the solvent is at least one selected from ethylene glycol butyl ether, butyl acetate and propylene glycol methyl ether acetate.

Optionally, the color steel plate includes: cold rolling the substrate; a metal plating layer formed on a surface of the cold-rolled substrate; a chemical conversion layer formed on the surface of the metal plating layer; a primer layer formed on a surface of the chemical conversion layer; and the finishing paint layer is formed on the surface of the primer layer.

Optionally, the metal coating is selected from an aluminum zinc coating or a zinc aluminum magnesium coating. Optionally, the mass percentage of aluminum is 50-60 wt.%, based on the total mass of the material of the metal coating.

Optionally, the chemical conversion layer is a metal composite oxide and/or a salt compound formed after the chemical conversion treatment is performed on the surface of the metal coating; the metal composite oxide is ZnO or Cr₂O₃And Al₂O₃Is ZnM, the salt compound is ZnM_OO₄、ZnM_O3O₈And ZnSiO₃One or more of (a).

Optionally, the primer layer is an epoxy and/or a polyurethane.

According to the technical scheme, the flaky filler is added into the finish paint of the color steel plate in a certain proportion, the diameter and the radius-thickness ratio of the filler are controlled, the porosity in the finish paint is reduced, the water resistance of the finish paint is improved, and the humidity resistance and the adhesion of the color steel plate are improved. By controlling the type of the flaky filler, a Si-O-Me bond with higher bond energy is formed between the finish paint and the structural adhesive, so that stable bonding between the finish paint and the structural adhesive is realized, and the long-term bonding reliability of the color steel plate and the structural adhesive is improved.

Additional features and advantages of the disclosure will be set forth in the detailed description which follows.

Detailed Description

The following describes in detail specific embodiments of the present disclosure. It should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, not limitation.

Through a large number of experiments, the inventor of the present disclosure finds that the prior art route of a color steel plate product cannot meet the requirements of the BIPV system of a metal roof for adhesiveness, humidity and heat resistance and adhesive force, and an I-shaped part made of a steel plate and a structural adhesive undergoes water bath and damp and heat aging to cause interface damage of the steel plate and the adhesive, and more seriously, the coating will blister and fall off, mainly because the chemical bonding capability between the finish paint of the color steel plate and the structural adhesive is weaker, and the water vapor permeability of the finish paint is higher, so that organic matters in a paint film are hydrolyzed, which affects the adhesion between the finish paint and the structural adhesive on the one hand, and damages the primer on the other hand, so that a corrosive medium enters into a direct corrosion carbon steel substrate, and reduces the adhesive force between the primer and the substrate. Accordingly, the present disclosure provides a color steel plate, which includes a top paint layer, wherein the material of the top paint layer contains a filler, and the filler includes a flaky filler and a granular filler; wherein, the adding amount of the filler accounts for 20-50% of the total weight of the finish coat layer material; wherein the addition amount of the platy filler accounts for 20-40% of the total weight of the filler.

The finish paint layer disclosed by the invention can ensure good adhesiveness between the color steel plate and the photovoltaic module and humidity resistance and adhesion in the long-term service process of a photovoltaic roof system. Specifically, through a large number of experiments, the inventor of the present disclosure finds that by adding a certain proportion of the flaky filler to the finish paint, the solvent is inevitably volatilized in the finish paint baking film forming process to leave tiny holes in the finish paint layer, and compared with the currently adopted granular filler, the flaky filler has lower porosity in the finish paint after film forming, and the water blocking capability of the finish paint can be effectively improved due to the low porosity of the finish paint.

The inventors of the present disclosure have found that adding platy fillers at too low or too high a ratio can result in increased porosity of the topcoat, reducing water blocking capability. As a preferred embodiment of the present disclosure, the filler may be added in an amount of 25-45% by weight of the total weight of the topcoat material; the amount of the platy filler added can be 25 to 35 percent of the total weight of the filler.

Furthermore, the particle size and the diameter-thickness ratio of the flaky filler are too small, so that the porosity of the finish paint is correspondingly increased; too large a particle size results in poor film-forming properties of the paint film, which also results in increased porosity of the finish. Therefore, the diameter of the plate-like filler of the present disclosure may be 50 to 120 micrometers, and the ratio of the diameter to the thickness of the plate-like filler may be not less than 60. As a preferred embodiment of the present disclosure, the diameter of the plate-like filler may be 60 to 100 micrometers, and the ratio of the diameter to the thickness of the plate-like filler may be not less than 80.

In order to improve the bonding reliability of the finish paint and the structural adhesive, the flaky filler can be selected from flaky mica and/or stainless steel flakes. Wherein, the main components of the flaky mica are oxides of silicon and aluminum, and the surface of the stainless steel flake is an oxide of chromium. The metal oxide in the flaky filler can form Si-O-Me bonds with higher bond energy with silane in the structural adhesive, wherein Me represents metal elements such as aluminum, chromium, silicon and the like, so that stable chemical bonding is formed with the structural adhesive.

The particulate fillers used in the present disclosure may be known to those skilled in the art, for example, titanium dioxide may be used as the particulate filler.

In a specific embodiment of the present disclosure, the topcoat layer further contains a resin, a pigment, an auxiliary agent, and a solvent; the resin may be at least one selected from the group consisting of polyester resin, highly weather-resistant polyester, silicon-modified polyester, and polyvinylidene fluoride resin, based on the total weight of the topcoat layer; the pigment can be selected from at least one of iron oxide red and/or titanium yellow, and in addition, other various pigment components can be added according to the actual application requirement so that the finish paint has various colors; the auxiliary agent can be selected from an acrylic leveling agent and/or a polyvinylidene fluoride wax lubricant; the solvent may be selected from at least one of ethylene glycol butyl ether, butyl acetate and propylene glycol methyl ether acetate.

According to the present disclosure, the color plate may include: cold rolling the substrate; a metal plating layer formed on a surface of the cold-rolled substrate; a chemical conversion layer formed on the surface of the metal plating layer; a primer layer formed on a surface of the chemical conversion layer; and the finishing paint layer is formed on the surface of the primer layer.

According to the present disclosure, the metal plating layer may provide anode protection for the cold-rolled substrate, prolong the service life of the steel plate, and may be selected from an aluminum-zinc plating layer or a zinc-aluminum-magnesium plating layer for the color steel plate of the BIPV in order to achieve the same life matching with the photovoltaic module.

As is well known to those skilled in the art, the cold rolled substrate may be a carbon steel substrate.

According to the present disclosure, in order to improve the service life and the notch corrosion resistance of the color steel plate, the mass percentage of aluminum may be 50 to 60 wt% based on the total mass of the material of the metal plating layer.

According to the disclosure, the chemical conversion layer is a metal composite oxide and/or a salt compound formed after the chemical conversion treatment is carried out on the surface of the metal coating; the metal composite oxide is ZnO or Cr₂O₃、Al₂O₃Is ZnM, the salt compound is ZnM_OO₄、ZnM_O3O₈、ZnSiO₃One or more of (a).

According to the present disclosure, the primer layer may be an epoxy and/or a polyurethane.

As a specific embodiment of the present disclosure, the method for manufacturing a color steel plate may include the steps of:

and S1, cleaning the cold-rolled substrate, and then carrying out hot dip coating treatment to obtain the cold-rolled substrate with the metal coating on the surface. Wherein, the mass percent of the aluminum in the plating solution can be 50-60 wt%, and the balance is zinc, or the mass percent of the aluminum in the plating solution can be 50-60 wt%, the mass percent of the magnesium can be 1-3 wt%, and the balance is zinc. The thickness of the single-side plating layer of the steel plate is 20-30 mu m.

And S2, carrying out chemical conversion treatment on the surface of the cold-rolled substrate with the metal coating attached to the surface, and forming metal composite oxide and/or salt compound on the surface of the coating to obtain the cold-rolled substrate with the chemical conversion layer. Wherein the metal composite oxide is ZnO or Cr₂O₃And Al₂O₃Is ZnM, the salt compound is ZnM_OO₄、ZnM_O3O₈And ZnSiO₃One or more of; the thickness of the chemical conversion layer is1-4nm。

And S3, coating primer on the surface of the cold-rolled substrate with the chemical conversion layer in a roll coating mode to obtain the cold-rolled substrate with the primer layer. In order to improve the corrosion resistance of the primer, the primer can be one of epoxy resin or polyurethane primer, and the thickness of the dried primer is 3-8 μm.

S4, coating the finish paint on the surface of the cold-rolled substrate of the primer layer in a roller coating mode, wherein the thickness of the dried finish paint is 15-30 mu m, and the color steel plate is obtained after finishing the finish paint.

The present disclosure is further illustrated by the following examples, but is not to be construed as being limited thereby.

The particulate filler used in the examples and comparative examples of the present disclosure was titanium dioxide.

The preparation method of the color steel plate in the embodiment and the comparative example in the disclosure comprises the following steps: forming a zinc-aluminum-magnesium coating with the thickness of 28 mu m on a carbon steel substrate, wherein the mass percent of aluminum in the zinc-aluminum-magnesium coating is 52 percent, and the mass percent of magnesium is 2 percent; carrying out chemical conversion treatment on the surface of the zinc-aluminum coating to generate a chemical conversion layer with the thickness of 2 nm; a primer layer having a thickness of 6 μm was sequentially formed on the surface of the chemical conversion layer to obtain a cold-rolled substrate having no topcoat layer applied thereon. 40 weight percent of high weather-resistant polyester resin, 2 weight percent of iron oxide red pigment, 2 weight percent of acrylic acid flatting agent, 3 weight percent of polyvinylidene fluoride wax lubricant and 10 weight percent of butyl acetate solvent are mixed to obtain a first mixed material.

Example 1

28 weight percent of platy mica and 72 weight percent of titanium dioxide are mixed to obtain the filler of the embodiment, 43 weight percent of the filler is mixed with 57 weight percent of the first mixed material to obtain the finish paint layer of the embodiment, wherein the diameter and the thickness of the platy mica are shown in Table 1.

Example 2

The filler of this example was obtained by mixing 40 wt% of the platy mica with 60 wt% of the titanium dioxide, and the topcoat layer of this example was obtained by mixing 43 wt% of the above filler with 57 wt% of the first mixture, wherein the diameter and thickness of the platy mica used are shown in table 1.

Example 3

The filler of this example was obtained by mixing 35 wt% of stainless steel flakes and 65 wt% of titanium dioxide, and the topcoat layer of this example was obtained by mixing 43 wt% of the above filler with 57 wt% of the first mixture, wherein the diameter and thickness of the stainless steel flakes used are shown in table 1.

Example 4

The filler of this example was obtained by mixing 10 wt% of the flaky mica, 10 wt% of the stainless steel flakes and 80 wt% of the titanium dioxide, and the finish paint layer of this example was obtained by mixing 43 wt% of the above filler with 57 wt% of the first mixture, wherein the diameters and thicknesses of the flaky mica and the stainless steel flakes used are shown in table 1.

Example 5

13 weight percent of flaky mica, 12 weight percent of stainless steel flake and 75 weight percent of titanium dioxide are mixed to obtain the filler of the embodiment, 43 weight percent of the filler is mixed with 57 weight percent of the first mixed material to obtain the finish paint layer of the embodiment, wherein the diameters and the thicknesses of the flaky mica and the stainless steel flake are shown in Table 1.

Comparative example 1

The finish paint prepared by the comparative example only adopts the granular filler, does not contain flaky mica and stainless steel flakes, and the finish paint of the comparative example is obtained by mixing 43 weight of titanium dioxide and 57 weight of the first mixed material.

Comparative example 2

The material of the top coat of this comparative example contains 5 wt% of flake mica, 5 wt% of flake mica and 95 wt% of titanium dioxide are mixed to obtain the filler of this example, and 43 wt% of the above filler is mixed with 57 wt% of the first mixture to obtain the top coat of this example, wherein the diameter and thickness of the flake mica are shown in table 1.

TABLE 1

Test example 1

A JG/T475 is adopted to prepare a bonding test piece of the color steel plate and the structural adhesive, the water resistance and the adhesive property of the color steel plate are evaluated by adopting a damp-heat aging test in IEC 61215, JG/T475 and other standards, the test piece is subjected to a tension test after the test is finished, and the bonding reliability and the damp-heat resistance of the structural adhesive and the color steel plate can be judged according to the damage form of the test piece. The test results are shown in Table 2.

Wherein the destruction form: 1 represents cohesive failure of the structural adhesive; 2, the interface between the paint film of the color steel plate and the structural adhesive is damaged. The cohesive failure of the structural adhesive shows that the bonding between the color steel plate and the structural adhesive is reliable, and the interface failure of the color steel plate paint film and the structural adhesive shows that the color steel plate is not suitable for the BIPV system adopting the adhesive technology

TABLE 2

As can be seen from table 2, the finish paint material in the present disclosure has no interfacial damage between the paint film of the color steel plate and the structural adhesive, and therefore, the color steel plate prepared in the present disclosure is suitable for the BIPV system using the adhesive technology.

The preferred embodiments of the present disclosure have been described in detail above, however, the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

It should be noted that, in the foregoing embodiments, various features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various combinations that are possible in the present disclosure are not described again.

In addition, any combination of various embodiments of the present disclosure may be made, and the same should be considered as the disclosure of the present disclosure, as long as it does not depart from the spirit of the present disclosure.

Claims

1. The color steel plate is characterized by comprising a finish paint layer, wherein the material of the finish paint layer contains fillers, and the fillers comprise flaky fillers and granular fillers; wherein, the adding amount of the filler accounts for 20-50% of the total weight of the finish coat layer material; the addition amount of the flaky filler accounts for 20-40% of the total weight of the filler.

2. The color steel plate of claim 1, wherein the filler is added in an amount of 25-45% by weight based on the total weight of the finish coat material; the addition amount of the flaky filler accounts for 25-35% of the total weight of the filler.

3. The color steel plate of claim 1, wherein the diameter of the plate-shaped filler is 50-120 micrometers, and the ratio of the diameter to the thickness of the plate-shaped filler is not less than 60.

4. The color steel plate of claim 3, wherein the diameter of the plate-shaped filler is 60-100 micrometers, and the ratio of the diameter to the thickness of the plate-shaped filler is not less than 80.

5. The color steel plate of claim 1, wherein the plate-like filler is selected from plate-like mica and/or stainless steel flakes.

6. The color steel plate according to claim 1, wherein the topcoat layer further contains a resin, a pigment, an auxiliary agent, and a solvent;

7. The color plate according to any one of claims 1 to 6, wherein the color plate comprises:

cold rolling the substrate;

a metal plating layer formed on a surface of the cold-rolled substrate;

a chemical conversion layer formed on the surface of the metal plating layer;

a primer layer formed on a surface of the chemical conversion layer; and

the finishing paint layer is formed on the surface of the primer layer.

8. The color steel plate according to claim 7, wherein the metal plating layer is selected from an aluminum zinc plating layer or a zinc aluminum magnesium plating layer;

optionally, the mass percentage of aluminum is 50-60 wt.%, based on the total mass of the material of the metal coating.

9. The color steel plate according to claim 7, wherein the chemical conversion layer is a metal composite oxide and/or a salt compound formed after a chemical conversion treatment is performed on the surface of the metal plating layer; the metal composite oxide is ZnO or Cr₂O₃And Al₂O₃Is ZnM, the salt compound is ZnM_OO₄、ZnM_O3O₈And ZnSiO₃One or more of (a).

10. The color steel plate of claim 7, wherein the primer layer is epoxy resin and/or polyurethane.