CN115975473A - Cold-rolled steel strip with heat dissipation function and processing technology thereof - Google Patents
Cold-rolled steel strip with heat dissipation function and processing technology thereof Download PDFInfo
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- CN115975473A CN115975473A CN202211599604.3A CN202211599604A CN115975473A CN 115975473 A CN115975473 A CN 115975473A CN 202211599604 A CN202211599604 A CN 202211599604A CN 115975473 A CN115975473 A CN 115975473A
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Abstract
The invention relates to the technical field of cold-rolled steel strips, in particular to a cold-rolled steel strip with a heat dissipation function and a processing technology thereof. The scheme optimizes and improves the surface coating process of the cold-rolled steel strip, improves the surface corrosion resistance of the cold-rolled steel strip, and simultaneously improves the heat-conducting property of the cold-rolled steel strip, so that the heat-radiating property of the cold-rolled steel strip is improved. The components of each layer of coating liquid on the surface of the cold-rolled steel strip are reasonably designed, and through the morphological design and magnetic change of the heat-conducting fillers on different layers, after the cold-rolled steel strip is solidified under the subsequent magnetic field condition, the lapping networks of the bottom layer and the middle layer of the product are mutually in a staggered differentiation manner so as to prevent corrosive media from entering the cold-rolled steel strip; and the outmost layer is directionally arranged and protected, the integral corrosion resistance of the product is improved, and the product has excellent heat dissipation performance and higher practicability.
Description
Technical Field
The invention relates to the technical field of cold-rolled steel strips, in particular to a cold-rolled steel strip with a heat dissipation function and a processing technology thereof.
Background
The steel belts are divided into two types of common steel belts and high-quality steel belts according to the used materials; the method comprises two types of hot rolled steel strips and cold rolled steel strips according to the processing method. Dividing the steel strip into a thin steel strip (the thickness is not more than 4 mm) and a thick steel strip (the thickness is more than 4 mm) according to the thickness; dividing the steel strip into a wide steel strip (the width is more than 600 mm) and a narrow steel strip (the width is not more than 600 mm) according to the width; the narrow steel band is divided into a directly rolled narrow steel band and a narrow steel band longitudinally cut by a wide steel band; the surface state is divided into the original rolling surface and the surface steel belt of the plating (coating) layer.
In the prior art, steel strips are widely applied, so that enterprises have high requirements on the surface corrosion resistance of the steel strips, the corrosion resistance of the steel strip surface is generally improved by technical means such as surface nickel plating and epoxy resin organic coating, and when the steel strips are applied to the electronic field, the steel strips are often required to have excellent heat dissipation performance, and how to improve the heat dissipation performance of products while ensuring the corrosion resistance of the steel strip surface is a technical problem to be solved urgently.
Disclosure of Invention
The invention aims to provide a cold-rolled steel strip with a heat dissipation function and a processing technology thereof, so as to solve the problems in the background technology.
In order to solve the technical problems, the invention provides the following technical scheme:
a processing technology of a cold-rolled steel strip with a heat dissipation function specifically comprises the following steps:
(1) Taking diethylenetriamine, sodium ethoxide and absolute ethyl alcohol, carrying out ultrasonic dispersion for 20-30 min, heating to 65-70 ℃, stirring for 1-2 h, adding 1H,2H and 2H-perfluorooctyl methacrylate, carrying out heat preservation reaction for 10-12 h under the nitrogen atmosphere, cooling after the reaction is finished, and carrying out reduced pressure distillation to remove the solvent to obtain a modified curing agent;
(2) Taking the heat-conducting filler and absolute ethyl alcohol, performing ultrasonic dispersion, adding the modified curing agent, uniformly stirring, adding the epoxy resin, and continuously and uniformly stirring to obtain an epoxy resin coating solution;
(3) Taking a cold-rolled steel strip, polishing the surface of the cold-rolled steel strip, soaking the cold-rolled steel strip in a sodium hydroxide solution for 10-20 min, washing the cold-rolled steel strip with deionized water, transferring the cold-rolled steel strip to a mixed solution of KH-550, absolute ethyl alcohol and deionized water, soaking the cold-rolled steel strip for 1-2 h, taking out and drying the cold-rolled steel strip for later use;
and spraying epoxy resin coating liquid on the surface of the cold-rolled steel strip, and curing to obtain a finished product.
According to an optimized scheme, in the step (2), the heat-conducting filler is compounded by nanowires, nanoparticles and nanosheets; wherein the nano wire is any one or two of a silicon carbide nano wire and a magnetic silicon carbide nano wire; the nano particles are any one or more of nano silicon dioxide particles, nano aluminum oxide particles, magnetic nano silicon dioxide particles and magnetic nano aluminum oxide particles; the nano sheet is any one or a plurality of graphene nano sheets, magnetic graphene nano sheets and magnetic boron nitride nano sheets.
In an optimized scheme, in the step (2), the dosage of the modified curing agent is 30-35 wt% of the epoxy resin, and the dosage of the heat-conducting filler is 10-12 wt% of the epoxy resin.
The optimized scheme specifically comprises the following steps:
(1) Taking diethylenetriamine, sodium ethoxide and absolute ethyl alcohol, performing ultrasonic dispersion, heating to 65-70 ℃, stirring for 1-2 h, adding 1H, 2H-perfluorooctyl methacrylate, performing heat preservation reaction for 10-12 h under nitrogen atmosphere, cooling after the reaction is finished, and removing the solvent through reduced pressure distillation to obtain a modified curing agent;
(2) Taking the heat-conducting filler A and absolute ethyl alcohol, carrying out ultrasonic dispersion for 20-30 min, adding the modified curing agent, stirring uniformly, adding the epoxy resin, and continuing stirring for 10-20 min to obtain a solution A; the heat-conducting filler A is compounded by magnetic silicon carbide nanowires, nano aluminum oxide particles, graphene nanosheets and magnetic boron nitride nanosheets, and the mass ratio is 1:1:2:1;
taking the heat-conducting filler B and absolute ethyl alcohol, carrying out ultrasonic dispersion for 20-30 min, adding the modified curing agent, stirring uniformly, adding the epoxy resin, and continuing stirring for 10-20 min to obtain a solution B; wherein the heat-conducting filler B is compounded by silicon carbide nanowires, nano alumina particles, magnetic graphene nanosheets and magnetic boron nitride nanosheets, and the mass ratio is 1:2:1:1;
taking the heat-conducting filler C and absolute ethyl alcohol, carrying out ultrasonic dispersion for 20-30 min, adding the modified curing agent, stirring uniformly, adding the epoxy resin, and continuing stirring for 10-20 min to obtain a solution C; wherein the heat-conducting filler C is compounded by magnetic silicon carbide nanowires, magnetic nano alumina particles, magnetic graphene nanosheets and magnetic boron nitride nanosheets, and the mass ratio is 2:1:1:1;
(3) Taking a cold-rolled steel strip, polishing the surface of the cold-rolled steel strip, soaking the cold-rolled steel strip in a sodium hydroxide solution for 10-20 min, washing the cold-rolled steel strip with deionized water, transferring the cold-rolled steel strip to a mixed solution of KH-550, absolute ethyl alcohol and deionized water, soaking the cold-rolled steel strip for 1-2 h, taking out and drying the cold-rolled steel strip for later use;
spraying the solution A on the surface of the cold-rolled steel strip, semi-curing for 40-50 min at 25-30 ℃, spraying the solution B on the surface of the solution A, semi-curing for 40-50 min at 25-30 ℃, spraying the solution C on the surface of the solution B, and curing for 20-24 h at 25-30 ℃ to obtain a finished product.
According to an optimized scheme, in the step (3), the spraying thickness of the liquid A is 3-5 micrometers, the spraying thickness of the liquid B is 5-8 micrometers, and the spraying thickness of the liquid C is 8-10 micrometers. When the liquid A is semi-solidified, the liquid B is semi-solidified and the liquid C is solidified, the liquid A, the liquid B and the liquid C are all in a horizontal magnetic field, and the magnetic field intensity is 0.5-1T.
In an optimized scheme, in the step (1), the molar ratio of the diethylenetriamine to the 1H,2H and 2H-perfluorooctyl methacrylate is (1-1.1): 1, the using amount of the sodium ethoxide is 15-20 wt% of the diethylenetriamine.
According to an optimized scheme, in the step (2), cetyl trimethyl ammonium bromide is grafted on the surface of the heat-conducting filler, and the method specifically comprises the following steps: mixing cetyl trimethyl ammonium bromide and deionized water, stirring uniformly to obtain a cetyl trimethyl ammonium bromide aqueous solution, adjusting the pH to 8, adding a heat-conducting filler, stirring and dispersing for 1-1.5 h, stirring and reacting at 80-85 ℃ for 3-5 h, washing with deionized water after the reaction is finished, and drying in vacuum.
According to an optimized scheme, in the step (3), the components of the cold-rolled steel strip are as follows: and C: 0.01-0.012%, si is less than or equal to 0.02%, mn: 0.08-0.15%, P is less than or equal to 0.015%, S is less than or equal to 0.01%, al:0.025 to 0.055%, ti:0.15%, N: 0.003-0.005%, and the balance of Fe and inevitable impurities.
According to an optimized scheme, the cold-rolled steel strip is processed according to any one of the processing technologies of the cold-rolled steel strip with the heat dissipation function.
Compared with the prior art, the invention has the following beneficial effects:
the invention relates to the technical field of cold-rolled steel strips, in particular to a cold-rolled steel strip with a heat dissipation function and a processing technology thereof, the proposal takes the cold-rolled steel strip as a substrate, wherein the cold-rolled steel strip comprises the following chemical compositions: and C: 0.01-0.012%, si is less than or equal to 0.02%, mn: 0.08-0.15%, P is less than or equal to 0.015%, S is less than or equal to 0.01%, al:0.025 to 0.055%, ti:0.15%, N:0.003 to 0.005 percent of Fe and inevitable impurities as the rest; the cold-rolled steel strip prepared from the components has excellent mechanical properties; in order to improve the corrosion resistance of the cold-rolled steel strip, the scheme generally carries out organic coating modification on the surface of the cold-rolled steel strip, however, when the steel strip is applied to some electronic fields, certain requirements are also met on the heat dissipation performance of the steel strip, so that the scheme optimizes and improves the coating process of the surface of the cold-rolled steel strip, improves the heat conduction performance of the cold-rolled steel strip while improving the corrosion resistance of the surface of the cold-rolled steel strip, and improves the heat dissipation performance of the cold-rolled steel strip.
According to the scheme, epoxy resin, curing agent diethylenetriamine and heat-conducting filler are used as basic components of the surface coating of the cold-rolled steel strip, in order to further improve the corrosion resistance of the product, the scheme is to modify the curing agent diethylenetriamine, and the diethylenetriamine is grafted with 1H,2H and 2H-perfluorooctyl methacrylate to carry out Michael addition reaction, so that the fluorinated curing agent is prepared, and the epoxy resin coating with excellent hydrophobic property is prepared.
Meanwhile, the heat-conducting filler is designed to be matched with nanoparticles, nanowires and nanosheets in three different forms, and the nanowires are any one or two of silicon carbide nanowires and magnetic silicon carbide nanowires; the nano particles are any one or more of nano silicon dioxide particles, nano aluminum oxide particles, magnetic nano silicon dioxide particles and magnetic nano aluminum oxide particles; the nano sheet is any one or a plurality of graphene nano sheets, magnetic graphene nano sheets and magnetic boron nitride nano sheets; the materials have excellent heat-conducting property, and the heat-conducting property and the corrosion resistance of the product can be effectively improved through mutual overlapping and matching of fillers in different forms.
Meanwhile, on the basis of the scheme, in order to further improve the corrosion resistance of the product, the scheme is that a plurality of epoxy resin coatings are arranged on the surface of the cold-rolled steel strip, wherein the bottom layer is sprayed by liquid A, the heat-conducting filler A in the liquid A is compounded by magnetic silicon carbide nanowires, nano aluminum oxide particles, graphene nanosheets and magnetic boron nitride nanosheets, and the mass ratio is 1:1:2:1; in the middle layer (liquid B spraying), the heat-conducting filler B is compounded by silicon carbide nanowires, nano alumina particles, magnetic graphene nanosheets and magnetic boron nitride nanosheets in a mass ratio of 1:2:1:1; through the arrangement of different magnetic fillers in the liquid A and the liquid B and the difference of the forms of the magnetic fillers, the bottom layer and the middle layer can present different lapping networks under the action of a subsequent magnetic field, so that the entry of corrosive media is blocked, and the corrosion resistance of the product is more excellent; in the outermost layer (C liquid spraying), the heat-conducting filler C is compounded by magnetic silicon carbide nanowires, magnetic nano alumina particles, magnetic graphene nanosheets and magnetic boron nitride nanosheets, and the mass ratio is 2:1:1:1, the coatings all adopt magnetic media, and orderly overlap joint arrangement is realized under the action of a horizontal magnetic field, so that the overall corrosion resistance and the heat conductivity of the product are improved; meanwhile, due to the arrangement of the three epoxy coatings, the thickness of each layer needs to be limited and cannot be too thick, and the influence on the heat dissipation performance of the product is avoided.
The scheme discloses a cold-rolled steel strip with a heat dissipation function and a processing technology thereof, the process design is reasonable, the component design of each layer of coating liquid on the surface of the cold-rolled steel strip is reasonable, and through the morphological design and the magnetic change of heat-conducting fillers of different layers, after the curing of the heat-conducting fillers under the condition of a subsequent magnetic field, the lapping networks of a bottom layer and a middle layer of a product are mutually mixed and differentiated to prevent corrosive media from entering; and the outmost layer is directionally arranged and protected, the integral corrosion resistance of the product is improved, and the product has excellent heat dissipation performance and higher practicability.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the embodiment, the thickness of the graphene nanosheet is 5-8 nm, and the graphene nanosheet is purchased from Nanjing Jicang nanometer technology Co., ltd; boron nitride powder was purchased from Shandong Zibo Jingyi ceramics science and technology Co., ltd; the density of the silicon carbide nano-wire is 3.21g/cm 3 The diameter is 0.1-0.6 mu m, and the product is purchased from Changshisatai new materials Co., ltd; the nano alumina particle density is 3.953.21g/cm 3 The grain diameter is 1-3 μm, and the grain diameter is purchased from Shandong Kai Euro technology Co., ltd; epoxy resin (WSR 6101) available from southeast star synthetics, inc. Diethylenetriamine, 1H, 2H-perfluorooctyl methacrylate was purchased from Shanghai Aladdin.
The preparation steps of the boron nitride nanosheet are as follows: and (3) taking boron nitride powder, preserving heat for 2h at 900 ℃, dispersing the boron nitride powder into N, N-methylformamide, carrying out ultrasonic treatment for 24h, centrifuging, collecting a product, and washing with absolute ethyl alcohol to obtain the boron nitride nanosheet.
The preparation steps of the magnetic boron nitride nanosheet and the magnetic silicon carbide nanowire are as follows: placing 1g of boron nitride nanosheet or silicon carbide nanowire in 200mL of deionized water for ultrasonic dispersion, adding 1g of ferrous chloride tetrahydrate, stirring until the mixture is dissolved, adding 120mL of sodium hydroxide aqueous solution (the concentration is 0.1 mol/L), stirring for 2min, adding hydrogen peroxide until the system turns black, continuing stirring for 15min, performing ultrasonic dispersion for 2h, performing vacuum filtration, washing the system to be neutral by using the deionized water, and performing magnetic separation to obtain the magnetic boron nitride nanosheet.
The preparation method of the magnetic graphene nanosheet comprises the following steps: placing 1g of graphene nanosheet in 200mL of deionized water for ultrasonic dispersion, adding 1g of ferrous chloride tetrahydrate, stirring until the mixture is dissolved, adding ammonia water to adjust the pH value to 8, stirring for reaction for 40min, performing vacuum filtration, washing the mixture with deionized water until the mixture is neutral, and performing magnetic separation to obtain the magnetic graphene nanosheet.
The preparation steps of the magnetic nano alumina particles are as follows: taking 5g of ferric oxide (100-200 nm) and 300mL of normal propyl alcohol, carrying out ultrasonic dispersion, adding 12g of deionized water, 4g of stearic acid and 12g of aluminum isopropoxide, stirring and reacting for 6h at 70 ℃, carrying out centrifugal separation, washing, drying, calcining for 6h in air at the temperature of 673K, and carrying out heat preservation and calcination for 3h under the mixed atmosphere of hydrogen and nitrogen to obtain the magnetic nano aluminum oxide particles.
Example 1:
a processing technology of a cold-rolled steel strip with a heat dissipation function specifically comprises the following steps:
(1) Taking 0.11mol of diethylenetriamine, sodium ethoxide and 100mL of absolute ethyl alcohol, performing ultrasonic dispersion, heating to 65 ℃, stirring for 2h, adding 0.1mol of 1H,2H and 2H-perfluorooctyl methacrylate, performing heat preservation reaction for 10h in a nitrogen atmosphere, cooling after the reaction is finished, and performing reduced pressure distillation to remove the solvent to obtain a modified curing agent; the dosage of the sodium ethoxide is 20wt% of the diethylenetriamine.
(2) Taking 1g of heat-conducting filler A and absolute ethyl alcohol, carrying out ultrasonic dispersion for 20min, adding 3g of modified curing agent, stirring uniformly, adding 10g of epoxy resin, and continuing stirring for 20min to obtain solution A; wherein the heat-conducting filler A is compounded by 0.2g of magnetic silicon carbide nanowires, 0.2g of nano alumina particles, 0.4g of graphene nanosheets and 0.2g of magnetic boron nitride nanosheets in a mass ratio of 1:1:2:1.
taking 1g of heat-conducting filler B and absolute ethyl alcohol, carrying out ultrasonic dispersion for 20min, adding 3g of modified curing agent, stirring uniformly, adding 10g of epoxy resin, and continuing stirring for 20min to obtain solution B; wherein the heat-conducting filler B is compounded by 0.2g of silicon carbide nanowires, 0.4g of nano alumina particles, 0.2g of magnetic graphene nanosheets and 0.2g of magnetic boron nitride nanosheets in a mass ratio of 1:2:1:1.
taking 1g of heat-conducting filler C and absolute ethyl alcohol, carrying out ultrasonic dispersion for 20min, adding 3g of modified curing agent, stirring uniformly, adding 10g of epoxy resin, and continuing stirring for 20min to obtain solution C; wherein the heat-conducting filler C is compounded by 0.4g of magnetic silicon carbide nanowires, 0.2g of magnetic nano alumina particles, 0.2g of magnetic graphene nanosheets and 0.2g of magnetic boron nitride nanosheets in a mass ratio of 2:1:1:1;
(3) Taking a cold-rolled steel strip, polishing the surface of the cold-rolled steel strip, soaking the cold-rolled steel strip in 5wt% of sodium hydroxide solution for 10min, washing the cold-rolled steel strip by using deionized water, transferring the cold-rolled steel strip into a mixed solution containing 1wt% of KH-550, 90wt% of absolute ethyl alcohol and 9wt% of deionized water, soaking the cold-rolled steel strip for 1h, taking out the cold-rolled steel strip and drying the cold-rolled steel strip for later use; the cold-rolled steel strip comprises the following components: and C:0.012%, si is less than or equal to 0.02%, mn:0.15%, P is less than or equal to 0.015%, S is less than or equal to 0.01%, al:0.045%, ti:0.15%, N:0.005%, and the balance Fe and inevitable impurities.
And spraying the solution A on the surface of the cold-rolled steel strip, wherein the spraying thickness is 3 micrometers, semi-solidifying the solution A for 50min at 25 ℃, spraying the solution B on the surface of the solution A, the spraying thickness is 5 micrometers, semi-solidifying the solution B for 50min at 25 ℃, then spraying the solution C on the surface of the solution B, the spraying thickness is 10 micrometers, and solidifying the solution C for 24h at 25 ℃ to obtain a finished product.
Wherein, the liquid A is semi-solidified, the liquid B is semi-solidified, and the liquid C is solidified in a horizontal magnetic field, and the magnetic field intensity is 0.5T.
Example 2:
a processing technology of a cold-rolled steel strip with a heat dissipation function specifically comprises the following steps:
(1) Taking 0.11mol of diethylenetriamine, sodium ethoxide and 100mL of absolute ethyl alcohol, carrying out ultrasonic dispersion, heating to 70 ℃, stirring for 1.5h, adding 0.1mol of 1H,2H and 2H-perfluorooctyl methacrylate, carrying out heat preservation reaction for 11h in a nitrogen atmosphere, cooling after the reaction is finished, and carrying out reduced pressure distillation to remove the solvent to obtain a modified curing agent; the dosage of the sodium ethoxide is 20wt% of the diethylenetriamine.
(2) Taking 1g of heat-conducting filler A and absolute ethyl alcohol, carrying out ultrasonic dispersion for 25min, adding 3g of modified curing agent, stirring uniformly, adding 10g of epoxy resin, and continuing stirring for 15min to obtain solution A; wherein the heat-conducting filler A is compounded by 0.2g of magnetic silicon carbide nanowires, 0.2g of nano alumina particles, 0.4g of graphene nanosheets and 0.2g of magnetic boron nitride nanosheets, and the mass ratio is 1:1:2:1.
taking 1g of heat-conducting filler B and absolute ethyl alcohol, carrying out ultrasonic dispersion for 25min, adding 3g of modified curing agent, stirring uniformly, adding 10g of epoxy resin, and continuing stirring for 15min to obtain solution B; wherein the heat-conducting filler B is compounded by 0.2g of silicon carbide nanowires, 0.4g of nano alumina particles, 0.2g of magnetic graphene nanosheets and 0.2g of magnetic boron nitride nanosheets, and the mass ratio is 1:2:1:1.
taking 1g of heat-conducting filler C and absolute ethyl alcohol, carrying out ultrasonic dispersion for 25min, adding 3g of modified curing agent, stirring uniformly, adding 10g of epoxy resin, and continuing stirring for 15min to obtain solution C; wherein the heat-conducting filler C is compounded by 0.4g of magnetic silicon carbide nanowires, 0.2g of magnetic nano alumina particles, 0.2g of magnetic graphene nanosheets and 0.2g of magnetic boron nitride nanosheets, and the mass ratio is 2:1:1:1;
(3) Taking a cold-rolled steel strip, polishing the surface of the cold-rolled steel strip, soaking the cold-rolled steel strip in 5wt% of sodium hydroxide solution for 15min, washing the cold-rolled steel strip by using deionized water, transferring the cold-rolled steel strip into a mixed solution containing 1wt% of KH-550, 90wt% of absolute ethyl alcohol and 9wt% of deionized water, soaking the cold-rolled steel strip for 1.5h, taking out and drying the cold-rolled steel strip for later use; the cold-rolled steel strip comprises the following components: and C:0.012%, si is less than or equal to 0.02%, mn:0.15%, P is less than or equal to 0.015%, S is less than or equal to 0.01%, al:0.045%, ti:0.15%, N:0.005%, and the balance Fe and inevitable impurities.
And spraying the solution A on the surface of the cold-rolled steel strip, wherein the spraying thickness is 3 microns, semi-solidifying the solution A for 45min at 30 ℃, spraying the solution B on the surface of the solution A, the spraying thickness is 5 microns, semi-solidifying the solution B for 45min at 30 ℃, then spraying the solution C on the surface of the solution B, the spraying thickness is 10 microns, and solidifying the solution C for 22h at 30 ℃ to obtain a finished product.
Wherein, the liquid A is semi-solidified, the liquid B is semi-solidified, and the liquid C is solidified in a horizontal magnetic field, and the magnetic field intensity is 0.5T.
Example 3:
a processing technology of a cold-rolled steel strip with a heat dissipation function specifically comprises the following steps:
(1) Taking 0.11mol of diethylenetriamine, sodium ethoxide and 100mL of absolute ethyl alcohol, performing ultrasonic dispersion, heating to 70 ℃, stirring for 1h, adding 0.1mol of 1H,2H and 2H-perfluorooctyl methacrylate, performing heat preservation reaction for 12h in a nitrogen atmosphere, cooling after the reaction is finished, and performing reduced pressure distillation to remove the solvent to obtain a modified curing agent; the dosage of the sodium ethoxide is 20wt% of the diethylenetriamine.
(2) Taking 1g of heat-conducting filler A and absolute ethyl alcohol, carrying out ultrasonic dispersion for 30min, adding 3g of modified curing agent, stirring uniformly, adding 10g of epoxy resin, and continuing stirring for 10min to obtain solution A; wherein the heat-conducting filler A is compounded by 0.2g of magnetic silicon carbide nanowires, 0.2g of nano alumina particles, 0.4g of graphene nanosheets and 0.2g of magnetic boron nitride nanosheets in a mass ratio of 1:1:2:1.
taking 1g of heat-conducting filler B and absolute ethyl alcohol, carrying out ultrasonic dispersion for 30min, adding 3g of modified curing agent, stirring uniformly, adding 10g of epoxy resin, and continuing stirring for 10min to obtain solution B; the heat-conducting filler B is compounded by 0.2g of silicon carbide nanowires, 0.4g of nano alumina particles, 0.2g of magnetic graphene nanosheets and 0.2g of magnetic boron nitride nanosheets, and the mass ratio is 1:2:1:1.
taking 1g of heat-conducting filler C and absolute ethyl alcohol, carrying out ultrasonic dispersion for 30min, adding 3g of modified curing agent, stirring uniformly, adding 10g of epoxy resin, and continuing stirring for 10min to obtain solution C; wherein the heat-conducting filler C is compounded by 0.4g of magnetic silicon carbide nanowires, 0.2g of magnetic nano alumina particles, 0.2g of magnetic graphene nanosheets and 0.2g of magnetic boron nitride nanosheets in a mass ratio of 2:1:1:1;
(3) Taking a cold-rolled steel strip, polishing the surface of the cold-rolled steel strip, soaking the cold-rolled steel strip in 5wt% of sodium hydroxide solution for 20min, washing the cold-rolled steel strip by using deionized water, transferring the cold-rolled steel strip into a mixed solution containing 1wt% of KH-550, 90wt% of absolute ethyl alcohol and 9wt% of deionized water, soaking the cold-rolled steel strip for 2h, taking the cold-rolled steel strip out, and drying the cold-rolled steel strip for later use; the cold-rolled steel strip comprises the following components: and C:0.012%, si is less than or equal to 0.02%, mn:0.15%, P is less than or equal to 0.015%, S is less than or equal to 0.01%, al:0.045%, ti:0.15%, N:0.005%, and the balance Fe and inevitable impurities.
And spraying the solution A on the surface of the cold-rolled steel strip, wherein the spraying thickness is 3 microns, semi-solidifying the solution A at 30 ℃ for 40min, spraying the solution B on the surface of the solution A, the spraying thickness is 5 microns, semi-solidifying the solution B at 30 ℃ for 40min, spraying the solution C on the surface of the solution B, the spraying thickness is 10 microns, and solidifying the solution C at 30 ℃ for 20h to obtain a finished product.
And when the liquid A is semi-solidified, the liquid B is semi-solidified and the liquid C is solidified, the liquid A, the liquid B and the liquid C are all in a horizontal magnetic field, and the magnetic field intensity is 0.5T.
Example 4: embodiment 4 is an improvement on the basis of embodiment 3, in embodiment 4, cetyltrimethylammonium bromide is grafted on the surfaces of the heat-conducting filler a, the heat-conducting filler B and the heat-conducting filler C, and then the heat-conducting filler a, the heat-conducting filler B and the heat-conducting filler C are added into epoxy resin to prepare a solution a, a solution B and a solution C, respectively, and the rest steps are not changed.
Wherein, the surface of the heat-conducting filler is grafted with hexadecyl trimethyl ammonium bromide, and the method comprises the following specific steps: mixing cetyl trimethyl ammonium bromide and deionized water, stirring uniformly to obtain 500mL of 5mmol/L cetyl trimethyl ammonium bromide aqueous solution, adjusting pH to 8, adding 25g of heat-conducting filler, stirring and dispersing for 1.5h, stirring at 85 ℃ for reaction for 3h, washing with deionized water after the reaction is finished, and vacuum drying.
Comparative example 1: comparative example 1 a control was carried out on the basis of example 3, in comparative example 1 no solution B was applied and the rest of the procedure was unchanged.
A processing technology of a cold-rolled steel strip with a heat dissipation function specifically comprises the following steps:
(1) Taking 0.11mol of diethylenetriamine, sodium ethoxide and 100mL of absolute ethyl alcohol, performing ultrasonic dispersion, heating to 70 ℃, stirring for 1h, adding 0.1mol of 1H,2H and 2H-perfluorooctyl methacrylate, performing heat preservation reaction for 12h in a nitrogen atmosphere, cooling after the reaction is finished, and performing reduced pressure distillation to remove the solvent to obtain a modified curing agent; the dosage of the sodium ethoxide is 20wt% of the diethylenetriamine.
(2) Taking 1g of heat-conducting filler A and absolute ethyl alcohol, carrying out ultrasonic dispersion for 30min, adding 3g of modified curing agent, stirring uniformly, adding 10g of epoxy resin, and continuing stirring for 10min to obtain solution A; wherein the heat-conducting filler A is compounded by 0.2g of magnetic silicon carbide nanowires, 0.2g of nano alumina particles, 0.4g of graphene nanosheets and 0.2g of magnetic boron nitride nanosheets in a mass ratio of 1:1:2:1.
taking 1g of heat-conducting filler C and absolute ethyl alcohol, carrying out ultrasonic dispersion for 30min, adding 3g of modified curing agent, stirring uniformly, adding 10g of epoxy resin, and continuing stirring for 10min to obtain solution C; wherein the heat-conducting filler C is compounded by 0.4g of magnetic silicon carbide nanowires, 0.2g of magnetic nano alumina particles, 0.2g of magnetic graphene nanosheets and 0.2g of magnetic boron nitride nanosheets, and the mass ratio is 2:1:1:1;
(3) Taking a cold-rolled steel strip, polishing the surface of the cold-rolled steel strip, soaking the cold-rolled steel strip for 20min by using a 5wt% sodium hydroxide solution, washing the cold-rolled steel strip by using deionized water, transferring the cold-rolled steel strip into a mixed solution of 1wt% KH-550, 90wt% absolute ethyl alcohol and 9wt% deionized water, soaking the cold-rolled steel strip for 2h, taking out the cold-rolled steel strip and drying the cold-rolled steel strip for later use; the cold-rolled steel strip comprises the following components: and C:0.012%, si is less than or equal to 0.02%, mn:0.15%, P is less than or equal to 0.015%, S is less than or equal to 0.01%, al:0.045%, ti:0.15%, N:0.005%, and the balance Fe and inevitable impurities.
And spraying the solution A on the surface of the cold-rolled steel strip, wherein the spraying thickness is 8 mu m, semi-solidifying for 40min at 30 ℃, spraying the solution C on the surface of the solution A, the spraying thickness is 10 mu m, and solidifying for 20h at 30 ℃ to obtain a finished product.
When the solution A is semi-solidified and the solution C is solidified, the solution A and the solution C are both in a horizontal magnetic field, and the magnetic field intensity is 0.5T.
Comparative example 2: comparative example 2 a control was carried out on the basis of example 3, in comparative example 2 only the solution C was applied, the remaining steps being unchanged.
A processing technology of a cold-rolled steel strip with a heat dissipation function specifically comprises the following steps:
(1) Taking 0.11mol of diethylenetriamine, sodium ethoxide and 100mL of absolute ethyl alcohol, performing ultrasonic dispersion, heating to 70 ℃, stirring for 1h, adding 0.1mol of 1H,2H and 2H-perfluorooctyl methacrylate, performing heat preservation reaction for 12h in a nitrogen atmosphere, cooling after the reaction is finished, and performing reduced pressure distillation to remove the solvent to obtain a modified curing agent; the dosage of the sodium ethoxide is 20wt% of the diethylenetriamine.
(2) Taking 1g of heat-conducting filler C and absolute ethyl alcohol, carrying out ultrasonic dispersion for 30min, adding 3g of modified curing agent, stirring uniformly, adding 10g of epoxy resin, and continuing stirring for 10min to obtain solution C; wherein the heat-conducting filler C is compounded by 0.4g of magnetic silicon carbide nanowires, 0.2g of magnetic nano alumina particles, 0.2g of magnetic graphene nanosheets and 0.2g of magnetic boron nitride nanosheets in a mass ratio of 2:1:1:1;
(3) Taking a cold-rolled steel strip, polishing the surface of the cold-rolled steel strip, soaking the cold-rolled steel strip in 5wt% of sodium hydroxide solution for 20min, washing the cold-rolled steel strip by using deionized water, transferring the cold-rolled steel strip into a mixed solution containing 1wt% of KH-550, 90wt% of absolute ethyl alcohol and 9wt% of deionized water, soaking the cold-rolled steel strip for 2h, taking the cold-rolled steel strip out, and drying the cold-rolled steel strip for later use; the cold-rolled steel strip comprises the following components: and C:0.012%, si is less than or equal to 0.02%, mn:0.15%, P is less than or equal to 0.015%, S is less than or equal to 0.01%, al:0.045%, ti:0.15%, N:0.005%, and the balance of Fe and inevitable impurities.
And spraying the C liquid on the surface of the cold-rolled steel strip, wherein the spraying thickness is 18 mu m, and curing for 20 hours at 30 ℃ to obtain a finished product.
And when the solution C is solidified, the solution C is in a horizontal magnetic field, and the magnetic field intensity is 0.5T.
Comparative example 3: comparative example 3 a control was performed on the basis of example 3, and in comparative example 3 no magnetic field environment was set.
A processing technology of a cold-rolled steel strip with a heat dissipation function specifically comprises the following steps:
(1) Taking 0.11mol of diethylenetriamine, sodium ethoxide and 100mL of absolute ethyl alcohol, performing ultrasonic dispersion, heating to 70 ℃, stirring for 1h, adding 0.1mol of 1H,2H and 2H-perfluorooctyl methacrylate, performing heat preservation reaction for 12h in a nitrogen atmosphere, cooling after the reaction is finished, and performing reduced pressure distillation to remove the solvent to obtain a modified curing agent; the dosage of the sodium ethoxide is 20wt% of the diethylenetriamine.
(2) Taking 1g of heat-conducting filler A and absolute ethyl alcohol, carrying out ultrasonic dispersion for 30min, adding 3g of modified curing agent, stirring uniformly, adding 10g of epoxy resin, and continuing stirring for 10min to obtain solution A; wherein the heat-conducting filler A is compounded by 0.2g of magnetic silicon carbide nanowires, 0.2g of nano alumina particles, 0.4g of graphene nanosheets and 0.2g of magnetic boron nitride nanosheets, and the mass ratio is 1:1:2:1.
taking 1g of heat-conducting filler B and absolute ethyl alcohol, carrying out ultrasonic dispersion for 30min, adding 3g of modified curing agent, stirring uniformly, adding 10g of epoxy resin, and continuing stirring for 10min to obtain liquid B; the heat-conducting filler B is compounded by 0.2g of silicon carbide nanowires, 0.4g of nano alumina particles, 0.2g of magnetic graphene nanosheets and 0.2g of magnetic boron nitride nanosheets, and the mass ratio is 1:2:1:1.
taking 1g of heat-conducting filler C and absolute ethyl alcohol, carrying out ultrasonic dispersion for 30min, adding 3g of modified curing agent, stirring uniformly, adding 10g of epoxy resin, and continuing stirring for 10min to obtain solution C; wherein the heat-conducting filler C is compounded by 0.4g of magnetic silicon carbide nanowires, 0.2g of magnetic nano alumina particles, 0.2g of magnetic graphene nanosheets and 0.2g of magnetic boron nitride nanosheets, and the mass ratio is 2:1:1:1;
(3) Taking a cold-rolled steel strip, polishing the surface of the cold-rolled steel strip, soaking the cold-rolled steel strip in 5wt% of sodium hydroxide solution for 20min, washing the cold-rolled steel strip by using deionized water, transferring the cold-rolled steel strip into a mixed solution containing 1wt% of KH-550, 90wt% of absolute ethyl alcohol and 9wt% of deionized water, soaking the cold-rolled steel strip for 2h, taking the cold-rolled steel strip out, and drying the cold-rolled steel strip for later use; the cold-rolled steel strip comprises the following components: and C:0.012%, si is less than or equal to 0.02%, mn:0.15%, P is less than or equal to 0.015%, S is less than or equal to 0.01%, al:0.045%, ti:0.15%, N:0.005%, and the balance Fe and inevitable impurities.
And spraying the solution A on the surface of the cold-rolled steel strip, wherein the spraying thickness is 3 microns, semi-solidifying the solution A at 30 ℃ for 40min, spraying the solution B on the surface of the solution A, the spraying thickness is 5 microns, semi-solidifying the solution B at 30 ℃ for 40min, spraying the solution C on the surface of the solution B, the spraying thickness is 10 microns, and solidifying the solution C at 30 ℃ for 20h to obtain a finished product.
And (3) detection test:
1. taking the steel strips prepared in the examples 1-4 and the comparative examples 1-3, detecting the surface water contact angle of the steel strips, wherein the volume of a water drop is 3 mu L, carrying out parallel measurement for 5 times, and averaging the results; according to the scheme disclosed in GB/T13448-2019 color coated steel plate and steel strip test method, the coating adhesion on the surface of the steel strip is tested by a cross-cut method.
The steel strips prepared in examples 1 to 4 and comparative examples 1 to 3 were taken and tested for thermal conductivity of the surface coating. When in testing, the coating is placed in a mould to be cured and molded.
Watch 1
| Item | Example 1 | Example 2 | Example 3 | Example 4 |
| Water contact angle | 151.3° | 151.7° | 152.1° | 152.4° |
| Adhesion force | Level 0 | Level 0 | Level 0 | Level 0 |
| Thermal conductivity W/(m × K) | 1.34 | 1.37 | 1.38 | 1.40 |
2. The steel strips prepared in the examples 1 to 4 and the comparative examples 1 to 3 are taken, and the lattice depth is marked until the steel strip matrix is exposed; the steel strip was tested for acid and alkali resistance by placing the sample to be tested in 5% HCl, 10% NaOH, soaking until the coating surface foamed, and recording the acid and alkali resistance time.
According to the scheme disclosed in GB/T1771-2007 determination of neutral salt spray resistance of colored paint and varnish, a neutral salt spray experiment is carried out, and the foaming and rusting time of the coating is recorded.
Watch two
| Item | Example 1 | Example 2 | Example 3 | Example 4 | Comparative example 1 | Comparative example 2 | Comparative example 3 |
| Acid resistance | 651h | 657h | 659h | 668h | 612h | 575h | 584h |
| Alkali resistance | 314h | 318h | 321h | 329h | 296h | 264h | 273h |
| Neutral salt fog resistance | 2847h | 2854h | 2861h | 2873h | 2542h | 2129h | 2317h |
And (4) conclusion: the technical design is reasonable, the components of the coating liquid of each layer on the surface of the cold-rolled steel strip are reasonably designed, and through the morphological design and the magnetic change of the heat-conducting fillers of different layers, after the curing of the heat-conducting fillers under the subsequent magnetic field condition, the lapping networks of the bottom layer and the middle layer of the product are mutually mixed and differentiated to prevent corrosive media from entering; and the outmost layer is directionally arranged and protected, the integral corrosion resistance of the product is improved, and the product has excellent heat dissipation performance and higher practicability.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A processing technology of a cold-rolled steel strip with a heat dissipation function is characterized by comprising the following steps: the method specifically comprises the following steps:
(1) Taking diethylenetriamine, sodium ethoxide and absolute ethyl alcohol, carrying out ultrasonic dispersion for 20-30 min, heating to 65-70 ℃, stirring for 1-2 h, adding 1H,2H and 2H-perfluorooctyl methacrylate, carrying out heat preservation reaction for 10-12 h under the nitrogen atmosphere, cooling after the reaction is finished, and carrying out reduced pressure distillation to remove the solvent to obtain a modified curing agent;
(2) Taking the heat-conducting filler and absolute ethyl alcohol, carrying out ultrasonic dispersion, adding the modified curing agent, uniformly stirring, adding the epoxy resin, and continuously uniformly stirring to obtain an epoxy resin coating solution;
(3) Taking a cold-rolled steel strip, polishing the surface of the cold-rolled steel strip, soaking the cold-rolled steel strip in a sodium hydroxide solution for 10-20 min, washing the cold-rolled steel strip with deionized water, transferring the cold-rolled steel strip to a mixed solution of KH-550, absolute ethyl alcohol and deionized water, soaking the cold-rolled steel strip for 1-2 h, taking out and drying the cold-rolled steel strip for later use;
spraying epoxy resin coating liquid on the surface of the cold-rolled steel strip, and curing to obtain a finished product;
in the step (2), the heat-conducting filler is compounded by nano wires, nano particles and nano sheets; wherein the nano wire is any one or two of a silicon carbide nano wire and a magnetic silicon carbide nano wire; the nano particles are any one or more of nano silicon dioxide particles, nano aluminum oxide particles, magnetic nano silicon dioxide particles and magnetic nano aluminum oxide particles; the nano sheet is any one or a plurality of graphene nano sheets, magnetic graphene nano sheets and magnetic boron nitride nano sheets.
2. The process for manufacturing a cold-rolled steel strip with a heat dissipation function as claimed in claim 1, wherein the process comprises the following steps: in the step (2), the amount of the modified curing agent is 30-35 wt% of the epoxy resin, and the amount of the heat-conducting filler is 10-12 wt% of the epoxy resin.
3. The process for manufacturing a cold-rolled steel strip with a heat dissipation function as claimed in claim 1, wherein the process comprises the following steps: the method specifically comprises the following steps:
(1) Taking diethylenetriamine, sodium ethoxide and absolute ethyl alcohol, carrying out ultrasonic dispersion, heating to 65-70 ℃, stirring for 1-2 h, adding 1H,2H and 2H-perfluorooctyl methacrylate, carrying out heat preservation reaction for 10-12 h under nitrogen atmosphere, cooling after the reaction is finished, and carrying out reduced pressure distillation to remove the solvent to obtain a modified curing agent;
(2) Taking the heat-conducting filler A and absolute ethyl alcohol, carrying out ultrasonic dispersion for 20-30 min, adding the modified curing agent, stirring uniformly, adding the epoxy resin, and continuing stirring for 10-20 min to obtain a solution A; the heat-conducting filler A is compounded by magnetic silicon carbide nanowires, nano aluminum oxide particles, graphene nanosheets and magnetic boron nitride nanosheets, and the mass ratio is 1:1:2:1;
taking the heat-conducting filler B and absolute ethyl alcohol, carrying out ultrasonic dispersion for 20-30 min, adding the modified curing agent, stirring uniformly, adding the epoxy resin, and continuing stirring for 10-20 min to obtain a liquid B; wherein the heat-conducting filler B is compounded by silicon carbide nanowires, nano alumina particles, magnetic graphene nanosheets and magnetic boron nitride nanosheets, and the mass ratio is 1:2:1:1;
taking the heat-conducting filler C and absolute ethyl alcohol, carrying out ultrasonic dispersion for 20-30 min, adding the modified curing agent, stirring uniformly, adding the epoxy resin, and continuing stirring for 10-20 min to obtain a solution C; wherein the heat-conducting filler C is compounded by magnetic silicon carbide nanowires, magnetic nano-alumina particles, magnetic graphene nanosheets and magnetic boron nitride nanosheets, and the mass ratio is 2:1:1:1;
(3) Taking a cold-rolled steel strip, polishing the surface of the cold-rolled steel strip, soaking the cold-rolled steel strip in a sodium hydroxide solution for 10-20 min, washing the cold-rolled steel strip with deionized water, transferring the cold-rolled steel strip to a mixed solution of KH-550, absolute ethyl alcohol and deionized water, soaking the cold-rolled steel strip for 1-2 h, taking out and drying the cold-rolled steel strip for later use;
spraying the solution A on the surface of the cold-rolled steel strip, semi-curing for 40-50 min at 25-30 ℃, spraying the solution B on the surface of the solution A, semi-curing for 40-50 min at 25-30 ℃, spraying the solution C on the surface of the solution B, and curing for 20-24 h at 25-30 ℃ to obtain a finished product.
4. The process for manufacturing a cold-rolled steel strip with a heat dissipation function as claimed in claim 3, wherein the process comprises the following steps: in the step (3), the spraying thickness of the liquid A is 3-5 μm, the spraying thickness of the liquid B is 5-8 μm, and the spraying thickness of the liquid C is 8-10 μm.
5. The process for manufacturing a cold-rolled steel strip with a heat dissipation function as claimed in claim 3, wherein the process comprises the following steps: in the step (3), the surfaces of the cold-rolled steel strips are all in a horizontal magnetic field when being solidified, and the magnetic field intensity is 0.5-1T.
6. The process for manufacturing a cold-rolled steel strip with a heat dissipation function as claimed in claim 3, wherein the process comprises the following steps: in the step (1), the molar ratio of the diethylenetriamine to the 1H, 2H-perfluorooctyl methacrylate is (1-1.1): 1, the using amount of the sodium ethoxide is 15-20 wt% of the diethylenetriamine.
7. The process for manufacturing a cold-rolled steel strip with a heat dissipation function according to claim 1, wherein the cold-rolled steel strip with a heat dissipation function comprises the following steps: in the step (2), cetyl trimethyl ammonium bromide is grafted on the surface of the heat-conducting filler, and the specific steps are as follows: mixing cetyl trimethyl ammonium bromide and deionized water, stirring uniformly to obtain a cetyl trimethyl ammonium bromide aqueous solution, adjusting the pH to 8, adding a heat-conducting filler, stirring and dispersing for 1-1.5 h, stirring and reacting at 80-85 ℃ for 3-5 h, washing with deionized water after the reaction is finished, and drying in vacuum.
8. The process for manufacturing a cold-rolled steel strip with a heat dissipation function as claimed in claim 1, wherein the process comprises the following steps: in the step (3), the cold-rolled steel strip comprises the following components: and C: 0.01-0.012%, si is less than or equal to 0.02%, mn: 0.08-0.15%, P is less than or equal to 0.015%, S is less than or equal to 0.01%, al:0.025 to 0.055%, ti:0.15%, N: 0.003-0.005%, and the balance of Fe and inevitable impurities.
9. The cold-rolled steel strip with a heat dissipation function, which is manufactured by the process according to any one of claims 1 to 8.
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