High-temperature-resistant and high-humidity-resistant color-coated sheet

Abstract

The utility model relates to the technical field of home appliance color-coated panels, in particular to a high-temperature and high-humidity resistant color-coated sheet, which comprises a metal substrate, a back paint layer and a finish paint layer, and the finish paint layer sequentially comprises a high-temperature and high-humidity resistant layer, a primer layer and a finish paint chemical treatment layer from outside to inside along the thickness direction. The high-temperature and high-humidity resistant layer is used for keeping the brilliance of pigment in a high-temperature and high-humidity environment, the finish paint chemical treatment layer is used for passivating the surface of a metal substrate, and the high-temperature and high-humidity resistant layer comprises SRP special reinforced polyester containing HDP high-weather-resistant polyester, inorganic ceramic pigment, a solvent and an auxiliary agent. The problem that a panel of an existing color-coated steel plate is prone to discoloring under the high-temperature and high-humidity conditions is effectively solved. According to the multilayer color-coated sheet, the SPR special reinforced polyester layer containing the HDP high-weather-resistant polyester is adopted to protect the color in the color-coated sheet, so that the prepared multilayer color-coated sheet can keep the bright color degree for a long time under the conditions of high temperature and high humidity.

Description

Technical Field

[0001] This utility model relates to the field of color-coated panels for home appliances, specifically to a color-coated panel that is resistant to high temperature and high humidity. Background Technology

[0002] Color-coated steel sheets have become one of the most technologically advanced and market-dynamic steel products in China. As a raw material for prefabricated building products, they are widely used in the enclosure structure systems of public buildings and industrial plants due to their rich colors, beautiful and novel appearance, flexible and varied decorative features, as well as their advantages such as light weight, high strength, waterproof and good seismic performance. Compared with traditional brick and concrete enclosure structures, they have the characteristics of long service life, land saving and recyclability.

[0003] However, in the home appliance sector, since refrigerators or gas water heaters are generally placed in the kitchen, which is a relatively humid and hot environment, and refrigerators or gas water heaters themselves generate a lot of heat during operation, the surface color of existing color-coated steel sheets will change under long-term high humidity and high heat environments. Utility Model Content

[0004] In view of the above situation and to overcome the defects of the existing technology, the purpose of this utility model is to provide a color-coated steel sheet that is resistant to high temperature and high humidity, which effectively solves the problem that existing color-coated steel sheets are prone to discoloration under high temperature and high humidity conditions.

[0005] The technical solution provided by this utility model is a color-coated sheet resistant to high temperature and high humidity, comprising a metal substrate, a back coating layer, and a topcoat layer. The back coating layer is disposed on the side of the metal substrate facing the machine, and the topcoat layer is disposed on the side of the metal substrate facing the outside. The topcoat layer, from the outside to the inside along its thickness direction, consists of a high temperature and high humidity resistance layer, a primer layer, and a topcoat chemical treatment layer. The high temperature and high humidity resistance layer is used to maintain the vibrancy of the pigments under high temperature and high humidity conditions. The primer layer is used to increase the adhesion of the high temperature and high humidity resistance layer. The topcoat chemical treatment layer is used to passivate the surface of the metal substrate. The high temperature and high humidity resistance layer comprises SRP special reinforced polyester containing HDP high weather-resistant polyester, inorganic ceramic pigments, solvents, and additives.

[0006] Preferably, the curing temperature of the high temperature and high humidity resistance layer is 210-240℃, and the dry film thickness of the high temperature and high humidity resistance layer is 10-20μm.

[0007] Preferably, the high temperature and high humidity resistance layer is prepared by stirring at 1200 r / min for 30 min.

[0008] Preferably, the curing temperature of the primer layer is 206-216℃, and the dry film thickness of the primer layer is 6-8μm.

[0009] Preferably, the back coating layer is configured as a back coating protective layer and a back coating chemical treatment layer in sequence from the machine to the metal substrate along the thickness direction, the curing temperature of the back coating protective layer is 206-216℃, and the dry film thickness of the back coating protective layer is 2-10μm.

[0010] Preferably, both the topcoat chemical treatment layer and the backcoat chemical treatment layer are treated with chromium-free coating solution and dried at 70-110°C.

[0011] Preferably, the topcoat layer and the backcoat layer further include a PE protective layer disposed outside the high temperature and high humidity resistant layer or outside the backcoat protective layer.

[0012] The beneficial effects of this utility model are as follows:

[0013] This invention uses an SPR special reinforced polyester layer containing HDP high weather-resistant polyester to protect the color in the color-coated steel sheet, so that the prepared multi-layer color-coated steel sheet can maintain the vibrancy of the color for a longer period of time under high temperature and high humidity conditions. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural schematic diagram of the present invention;

[0015] Figure 2 This is a cross-sectional right view structural diagram of this utility model;

[0016] In the figure, 1-metal substrate; 2-high temperature and high humidity resistance layer; 3-primer layer; 4-topcoat chemical treatment layer; 5-back paint protective layer; 6-back paint chemical treatment layer; 7-PE protective layer. Detailed Implementation

[0017] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings.

[0018] Refer to the instruction manual appendix Figure 1-2 A color-coated sheet resistant to high temperature and high humidity includes a metal substrate 1, a back paint layer and a top paint layer. The back paint layer is disposed on the side of the metal substrate 1 inside the machine. The back paint layer is divided into a back paint protective layer 5 and a back paint chemical treatment layer 6. In order to prevent scratches during transportation, a PE protective layer 7 is also provided on the outside of the back paint protective layer 5.

[0019] The topcoat layer is set on the side of the metal substrate 1 that is outside the machine. The topcoat layer is divided into a high temperature and high humidity resistance layer 2, a primer layer 3, and a topcoat chemical treatment layer 4. The topcoat chemical treatment layer 4 and the backcoat chemical treatment layer 6 are both used to passivate the surface of the metal substrate 1. At the same time, the topcoat chemical treatment layer 4 and the backcoat chemical treatment layer 6 are both passivated using a chromium-free coating solution. After treatment, they are dried at a temperature of 70-110℃.

[0020] The high temperature and high humidity resistance layer 2 in the topcoat layer is used to maintain the color vibrancy of the color in the color-coated plate under high temperature and high humidity conditions. The high temperature and high humidity resistance layer 2 is composed of 35%-50% SRP special reinforced polyester containing HDP high weather-resistant polyester, 20%-30% inorganic ceramic pigment, 15%-20% solvent and 3%-5% additives. The mixture is stirred at 1200r / min for 30min. The curing temperature of the high temperature and high humidity resistance layer 2 is 210-240℃, and the dry film thickness of the high temperature and high humidity layer is controlled at 10-20μm.

[0021] The primer layer 3 in the topcoat layer is used to increase the adhesion of the high temperature and high humidity resistance layer 2, so that the high temperature and high humidity resistance layer 2 can be better adhered to the metal substrate 1. The curing temperature of the primer layer 3 and the back paint protective layer 5 in the back paint layer is 206-216℃. The dry film thickness of the primer layer 3 is 6-8μm, and the dry film thickness of the back paint protective layer 5 is 2-10μm.

[0022] In the production process of this utility model, high zinc content coil steel is selected for uncoiling first, and then two adjacent coil steel are connected together by sewing. After sewing, the oil stains on the surface of the coil steel are treated with alkaline solution, and then cleaned and dried with deionized water.

[0023] After drying, the surface of the coiled steel is passivated with a chromium-free coating solution. After passivation, it is dried at a temperature of 70-110℃ to obtain a metal substrate 1 with a topcoat chemical treatment layer 4 and a backcoat chemical treatment layer 6. After passivation, the primer layer 3 and the backcoat protective layer 5 are coated by a three-roller coating method. The coating and curing temperature is 206-216℃. The dry film thickness of the primer layer 3 is 6-8μm, and the dry film thickness of the backcoat protective layer 5 is 2-10μm.

[0024] After the primer layer 3 and the back paint protective layer 5 are cured, the high temperature and high humidity resistance layer 2, which is mixed at a speed of 1200r / min, is also coated by a three-roller with a material on the roller. It is then cured at a temperature of 210-240℃. The thickness of the dry film after curing is 10-20μm. Finally, a PE protective film is covered on the outside of the back paint protective layer 5 and the high temperature and high humidity resistance layer 2.

[0025] The prepared color-coated steel sheets were tested under 500 hours of humid heat and 1000 hours of accelerated ultraviolet light aging, and the color of the color-coated steel sheets did not change.

[0026] This invention uses an SPR special reinforced polyester layer containing HDP high weather-resistant polyester to protect the color in the color-coated steel sheet, so that the prepared multi-layer color-coated steel sheet can maintain the vibrancy of the color for a longer period of time under high temperature and high humidity conditions.

Claims

1. A color-coated steel sheet resistant to high temperature and high humidity, comprising a metal substrate (1), a back coating layer, and a top coating layer, wherein the back coating layer is disposed on the side of the metal substrate (1) facing the machine, and the top coating layer is disposed on the side of the metal substrate (1) facing the outside, characterized in that, The topcoat layer consists of a high temperature and high humidity resistance layer (2), a primer layer (3), and a topcoat chemical treatment layer (4) in the thickness direction from the outside to the inside; the backcoat layer consists of a backcoat chemical treatment layer (6) and a backcoat protective layer (5) in the thickness direction from the inside to the outside.

2. The high-temperature and high-humidity resistant color-coated steel sheet according to claim 1, characterized in that: The curing temperature of the high temperature and high humidity resistance layer (2) is 210-240℃, and the dry film thickness of the high temperature and high humidity resistance layer (2) is 10-20μm.

3. The high-temperature and high-humidity resistant color-coated steel sheet according to claim 1, characterized in that: The curing temperature of the primer layer (3) is 206-216℃, and the dry film thickness of the primer layer (3) is 6-8μm.

4. The high-temperature and high-humidity resistant color-coated steel sheet according to claim 1, characterized in that: The curing temperature of the back paint protective layer (5) is 206-216℃, and the dry film thickness of the back paint protective layer (5) is 2-10μm.

5. The high-temperature and high-humidity resistant color-coated steel sheet according to claim 1, characterized in that: Both the topcoat chemical treatment layer (4) and the backcoat chemical treatment layer (6) are treated with chromium-free coating solution and dried at 70-110℃.

6. The high-temperature and high-humidity resistant color-coated steel sheet according to claim 1, characterized in that: It also includes a PE protective layer (7) set outside the high temperature and high humidity resistance layer (2) or set outside the back paint protective layer (5).

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