CN-122011905-A - Color-coated steel plate with gradient temperature control and antibacterial wear-resistant functions and preparation method thereof

CN122011905ACN 122011905 ACN122011905 ACN 122011905ACN-122011905-A

Abstract

The invention provides a color-coated steel plate with gradient temperature control and antibacterial wear-resistant functions and a preparation method thereof, wherein the color-coated steel plate comprises a metal base material, and a chemical conversion coating, a primer layer and a top-coat layer which are sequentially coated on at least one surface of the metal base material; the top coat layer is a coating prepared from materials including fluorine modified polysiloxane, the primer layer comprises a first thermal conductivity regulator and a first multi-scale ceramic reinforcing phase, and the first thermal conductivity regulator is formed by mixing a high thermal conductivity component and a low thermal conductivity component according to a first mass ratio; the finish paint layer comprises a second heat conductivity regulator and a second multi-scale ceramic reinforcing phase, wherein the second heat conductivity regulator is formed by mixing a high heat conductivity component and a low heat conductivity component according to a second mass ratio; the preparation method of the invention realizes the directional migration of the filler and the construction of a gradient structure by adjusting the stepped heating process of the roller coating production line drying furnace and combining with the specific gas diversion.

Inventors

ZHANG HAIFENG
HUANG ZIFEN
Gu Kunlian
ZHONG HUITING
HE JINLONG

Assignees

珠海拾比佰新型材料有限公司

Dates

Publication Date: 20260512
Application Date: 20260409

Claims (10)

1. A color-coated steel plate with gradient temperature control and antibacterial wear-resistant functions comprises a metal base material, and a chemical conversion coating, a primer layer and a top-coat layer which are sequentially coated on at least one surface of the metal base material, The primer layer comprises a first thermal conductivity regulator and a first multi-scale ceramic reinforcing phase, wherein the first thermal conductivity regulator is formed by mixing a high thermal conductivity component and a low thermal conductivity component according to a first mass ratio, and the first mass ratio is that the high thermal conductivity component is the low thermal conductivity component=3:7; The finish paint layer comprises a second thermal conductivity regulator and a second multi-scale ceramic reinforcing phase, wherein the second thermal conductivity regulator is formed by mixing the high thermal conductivity component and the low thermal conductivity component according to a second mass ratio, and the second mass ratio is that the high thermal conductivity component is the low thermal conductivity component=7:3; the primer layer and/or the finish layer also comprises a nano silver antibacterial agent; The first multi-scale ceramic reinforcing phase and the second multi-scale ceramic reinforcing phase each comprise ceramic particles of different particle sizes of coarse particles, fine particles and nanoparticles.
2. The color coated steel sheet with gradient temperature control and antibacterial wear-resistant functions according to claim 1, wherein the high thermal conductivity component is boron nitride and the low thermal conductivity component is hollow glass beads.
3. The color coated steel sheet with gradient temperature control and antibacterial wear-resistant functions according to claim 1, wherein the coarse particles are alumina particles with a particle size of 2-3 μm, the fine particles are zirconia particles with a particle size of 0.5-1 μm, and the nano particles are silicon carbide particles with a particle size of 50-200 nm.
4. The color-coated steel plate with the functions of gradient temperature control and antibiosis and wear resistance according to claim 3, wherein the mass ratio of coarse particles to fine particles to nano particles is (4-5): 3-4): 1-2.
5. The color-coated steel plate with the gradient temperature control and antibacterial wear-resistant functions according to claim 1, wherein film forming matrixes of the primer layer and the finish layer are saturated polyester resin, the primer layer further comprises a first dispersing agent, a first leveling agent and a first catalyst, and the finish layer further comprises a second dispersing agent, a second leveling agent and a second catalyst.
6. The color coated steel plate with the gradient temperature control and antibacterial wear-resistant functions according to claim 5, wherein the first dispersing agent is a silane coupling agent, the first leveling agent is an organosilicon leveling agent, the first catalyst is an organotin catalyst, the second dispersing agent is a high-molecular carboxylic acid type dispersing agent, the second leveling agent is a fluorine modified polysiloxane leveling agent, and the second catalyst is a compound of organotin and organobismuth catalysts.
7. The color-coated steel plate with the functions of gradient temperature control and antibiosis and wear resistance according to claim 1, further comprising a back paint layer coated on the other surface of the metal substrate, wherein the back paint layer comprises an epoxy resin film forming matrix, a nano silver antimicrobial agent, a third dispersing agent, a third leveling agent and a polyamide curing agent.
8. A method for preparing the color-coated steel plate with the functions of gradient temperature control, antibiosis and wear resistance as claimed in any one of claims 1 to 7, which is characterized by comprising the following steps: s1, cleaning the surface of a metal substrate, coating chemical conversion treatment liquid and drying to form a chemical conversion coating; s2, coating the prepared primer coating on the chemical conversion coating, and feeding the primer coating into a primer drying furnace for stepwise heating and curing to form a primer layer, wherein the primer drying furnace is divided into an inlet section, a middle section and an outlet section along the advancing direction of the plate, and the temperature of the inlet section is set to be lower than the temperature of the middle section, and the temperature of the middle section is lower than the temperature of the outlet section; S3, coating the prepared finish paint on the cured primer layer, and feeding the primer layer into a finish paint drying furnace for stepped heating and curing to form a finish paint layer, wherein the finish paint drying furnace is also divided into an inlet section, a middle section and an outlet section along the advancing direction of the plate, and the temperature of the inlet section is set to be lower than that of the middle section, and the temperature of the middle section is lower than that of the outlet section.
9. The method for preparing the color-coated steel plate with the gradient temperature control and antibacterial wear-resistant functions, according to claim 8, wherein in the step S2, the temperature of an inlet section of the primer baking furnace is 180-195 ℃, the temperature of a middle section of the primer baking furnace is 195-210 ℃, the temperature of an outlet section of the primer baking furnace is 210-230 ℃, the temperature of the inlet section of the finishing paint baking furnace is 185-200 ℃, the temperature of the middle section of the finishing paint baking furnace is 200-220 ℃ and the temperature of the outlet section of the finishing paint baking furnace is 220-240 ℃.
10. The method for preparing the color-coated steel plate with the functions of gradient temperature control and antibiosis and wear resistance according to claim 8, which is characterized in that, Mixing the first multi-scale ceramic reinforcing phase with a silane coupling agent for surface treatment, mixing with a first solvent and the silane coupling agent as a first dispersing agent, performing ultrasonic dispersion, adding the first thermal conductivity regulator, the nano silver antibacterial agent, the saturated polyester resin, the first leveling agent and the first catalyst, uniformly stirring, regulating the viscosity, and filtering; The preparation of the finish paint comprises the steps of mixing the second multi-scale ceramic reinforcing phase with a silane coupling agent for surface treatment, mixing with a second solvent and a second dispersing agent for ultrasonic dispersion, adding the second thermal conductivity regulator, the nano silver antibacterial agent, the saturated polyester resin, the second leveling agent and the second catalyst, uniformly stirring, regulating the viscosity and then filtering.

Description

Color-coated steel plate with gradient temperature control and antibacterial wear-resistant functions and preparation method thereof Technical Field The invention belongs to the technical field of surface treatment of metal materials, and particularly relates to a color-coated steel plate with gradient temperature control and antibacterial wear-resistant functions and a preparation method thereof. Background The color-coated steel plate has wide application in the fields of building enclosure, household appliance shell and the like due to excellent formability, decoration and corrosion resistance. Along with the development of high-end and specialized application scenes, for example, in medical facilities, food processing equipment, electronic heat dissipation parts and other occasions, higher requirements are put forward on the comprehensive performance of materials. Besides basic protection function, the multifunctional protective material also needs to have the composite functions of temperature regulation, surface antibiosis, wear resistance and the like. The existing technical scheme can only focus on single performance, in order to obtain antibacterial property, antibacterial agent is usually directly added into the coating, but uneven dispersion and poor durability are easy to occur, in order to improve the wear resistance, a method of adding hard particles is mostly adopted, but the toughness of the coating is possibly affected, in addition, although the concept of a functional gradient material is developed in the field of material science, typical preparation processes such as powder metallurgy, laser cladding and the like generally have the limitations of complex process, large equipment investment, difficult continuous production and the like, and the industrial application cannot be realized due to fundamental difference in technical principle and equipment requirements of a continuous roller coating production line mainly adopted in the color-coated plate industry. Disclosure of Invention In order to solve the technical problems that the existing color-coated steel plate is single in function and difficult to cooperate, one purpose of the invention is to provide a color-coated steel plate with gradient temperature control and antibacterial wear-resistant functions, and the other purpose of the invention is to provide a preparation method of the color-coated steel plate with gradient temperature control and antibacterial wear-resistant functions. In order to achieve the first object of the present invention, the following technical scheme is adopted: The color-coated steel plate with the gradient temperature control and antibacterial wear-resistant functions comprises a metal substrate, a chemical conversion coating, a primer layer and a finish coat, wherein the chemical conversion coating, the primer layer and the finish coat are sequentially coated on at least one surface of the metal substrate, the primer layer comprises a first thermal conductivity regulator and a first multi-scale ceramic reinforcing phase, the first thermal conductivity regulator is formed by mixing a high thermal conductivity component and a low thermal conductivity component according to a first mass ratio, the first mass ratio is high thermal conductivity component=3:7, the finish coat comprises a second thermal conductivity regulator and a second multi-scale ceramic reinforcing phase, the second thermal conductivity regulator is formed by mixing the high thermal conductivity component and the low thermal conductivity component according to a second mass ratio, the second mass ratio is high thermal conductivity component=7:3, the primer layer and/or the finish coat further comprises a nano silver antibacterial agent, and the first multi-scale ceramic reinforcing phase and the second multi-scale ceramic reinforcing phase respectively comprise ceramic particles with different particle diameters of coarse particles, fine particles and nano particles. In the present invention, a continuous thermal conductivity gradient from the topcoat layer (high thermal conductivity component to high) to the primer layer (low thermal conductivity component to high) is established in the thickness direction of the coating layer by the ratio difference between the high thermal conductivity component and the low thermal conductivity component in the primer layer and the topcoat layer (i.e., 3:7 high thermal conductivity component to low thermal conductivity component to 7:3 high thermal conductivity component in the primer layer). In the invention, the primer layer and/or the top coat layer also comprise nano silver antibacterial agent, and the nano silver antibacterial agent can provide more durable antibacterial function for the primer layer and/or the top coat layer. In the invention, the multiple gradations of the coarse particles, the fine particles and the nano particles contained in the first multi-scale ceramic reinforcing phase and