CN111763461A - Powder coating for improving wear resistance and wear resistance of surface of aluminum profile - Google Patents
Powder coating for improving wear resistance and wear resistance of surface of aluminum profile Download PDFInfo
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- CN111763461A CN111763461A CN202010728373.6A CN202010728373A CN111763461A CN 111763461 A CN111763461 A CN 111763461A CN 202010728373 A CN202010728373 A CN 202010728373A CN 111763461 A CN111763461 A CN 111763461A
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D163/00—Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/14—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies
- B05D7/16—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies using synthetic lacquers or varnishes
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G59/00—Polycondensates containing more than one epoxy group per molecule; Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups
- C08G59/14—Polycondensates modified by chemical after-treatment
- C08G59/1433—Polycondensates modified by chemical after-treatment with organic low-molecular-weight compounds
- C08G59/1438—Polycondensates modified by chemical after-treatment with organic low-molecular-weight compounds containing oxygen
- C08G59/1444—Monoalcohols
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- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/03—Powdery paints
- C09D5/033—Powdery paints characterised by the additives
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/18—Fireproof paints including high temperature resistant paints
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D2202/00—Metallic substrate
- B05D2202/20—Metallic substrate based on light metals
- B05D2202/25—Metallic substrate based on light metals based on Al
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- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2206—Oxides; Hydroxides of metals of calcium, strontium or barium
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- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2237—Oxides; Hydroxides of metals of titanium
- C08K2003/2241—Titanium dioxide
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Abstract
The invention relates to a powder coating for improving wear resistance and anti-attrition performance of an aluminum profile surface, which is prepared by introducing a polyfunctional group into epoxy resin, improves heat resistance and corrosion resistance, reduces curing time, and further overcomes the defects of insufficient adhesive force and poor wear resistance by carrying out melt extrusion and adding an anti-scratch agent, so that the powder coating has strong bonding force on the aluminum profile, and the protective performance cannot be gradually reduced along with the prolonging of the service time of a coating. The powder coating prepared by the invention is applied to the surface of an aluminum profile, has good associativity, shows excellent adhesion capacity when being coated on the surface of the aluminum profile, has higher mechanical strength, good weather resistance, chemical resistance, scratch resistance and abrasion resistance, can not be damaged or failed, has very strong abrasion resistance and wear resistance and higher chemical corrosion resistance, plays an excellent protection role in various complex environments, can bear the erosion wear of gas, solid and liquid, has excellent outdoor stability, and prolongs the service life of the aluminum profile.
Description
Technical Field
The invention relates to the technical field of paint preparation, in particular to a powder paint for improving the wear resistance and the antifriction property of the surface of an aluminum profile.
Background
Aluminum and aluminum alloy thereof have good physical and chemical properties, and the stable, continuous and rapid development of national economy and high and new technology in China promotes the rapid development of aluminum smelting and aluminum profile processing industry in China.
Compared with iron, the aluminum profile has better corrosion resistance. However, the texture is soft and easy to wear, and the wear and corrosion are accelerated by erosion of liquid flow, silt and the like. The erosion and abrasion phenomenon is widely existed in our life and industrial production, and is one of the important reasons for mainly causing material damage and influencing the working performance of products and equipment, therefore, aiming at the physical and chemical characteristics of aluminum profiles, a protective coating needs to be sprayed on the surface of the aluminum profiles. Therefore, the development of a corrosion-resistant, wear-resistant and high-temperature-resistant coating suitable for aluminum profiles is very urgent for protection of the aluminum profiles.
Disclosure of Invention
The invention aims to provide a powder coating for improving the wear resistance and the wear resistance of the surface of an aluminum profile, the wear resistance and the high temperature resistance after curing and film forming are fully considered when the formula of the powder coating is designed, the prepared coating has high chemical stability, friction resistance and non-migration property, the surface friction coefficient can be reduced, the erosion wear resistance of the aluminum profile is improved, and the powder coating has important significance for prolonging the service life of the aluminum profile.
The invention is realized by the following technical scheme:
a powder coating for improving the wear resistance and the antifriction property of the surface of an aluminum profile takes epoxy resin as a matrix material, and the epoxy resin is processed and modified, and the preparation method comprises the following steps:
(1) putting epoxy resin into a four-neck flask provided with a stirrer, a condenser and a thermometer, adding epoxy chloropropane accounting for 14.0-14.7 percent of the mass of the epoxy resin, 1, 4-dimethylolcyclohexane accounting for 3.4-3.8 percent of the mass of the epoxy resin and tetramethylammonium chloride accounting for 7.0-7.5 percent of the mass of the epoxy resin, heating to 57-58 ℃ under the condition of stirring at 270-one rotation/minute, introducing nitrogen, adding sodium hydroxide solution with the molar concentration of 7.6-7.9 mol/liter through a dropping funnel, adjusting the pH value of the system to 11.2-11.6, continuously heating to 77-78 ℃, stirring and reacting for 1-2 hours, closing the nitrogen, preserving the temperature for 2-3 hours, after the reaction is finished, putting the product into a rotary evaporator, recovering the residual solvent under reduced pressure, washing for 3-5 times by using distilled water, then putting into a vacuum drying oven at 80-90 ℃ and drying to constant weight, obtaining modified epoxy resin;
(2) uniformly mixing the modified epoxy resin obtained in the step (1) with a filler, a curing agent, a leveling agent and an anti-scratching agent according to the weight ratio of 60-70:30-36:0.6-0.8:1.0-1.3:0.4-0.7, adding the mixture into a mixer for pretreatment, stirring and mixing at a low speed of 200 revolutions per minute for 20-30 minutes at 180-.
The filler is prepared from the following components in parts by weight: 18-23 parts of calcium silicate, 7-10 parts of titanium dioxide, 2.5-2.7 parts of sodium silicate and 3.2-3.6 parts of aluminum oxide.
The anti-scratch agent comprises the following components in percentage by mass: 25-35% of silicone powder, 10-12% of superfine silicon dioxide, 10-15% of talcum powder, 8-10% of montmorillonite, 2-3% of sodium stearate, 3-5% of graphite powder and the balance of calcium oxide.
The coating process comprises the following steps: spraying the prepared powder coating on the surface of the pretreated aluminum profile by using electrostatic spraying equipment, wherein the coating thickness is between 100-120 microns, cooling in air for 30-40 minutes after spraying, then leveling in an oven at 125 ℃ of 120-125 ℃ for 10-15 minutes, and then curing for 20-25 minutes.
The method for processing the pre-processed aluminum profile comprises the following steps: (1) carrying out surface degreasing and polishing on the aluminum profile: wiping the surface with acetone, immersing in 0.8-1.0% hexadecyl trimethyl ammonium bromide aqueous solution at 35-40 deg.C, oscillating, cleaning for 3-5 min, drying in 60-70 deg.C drying oven, and polishing at 60-65 deg.C for 2-3 min; the polishing solution is prepared from the following components in percentage by mass: 1.0-1.5% of sodium percarbonate, 0.7-0.9% of sodium perborate, 0.35-0.38% of potassium perborate, 0.02-0.05% of barium carbonate, 0.3-0.4% of calcium oxide, 0.05-0.08% of anionic surfactant and the balance of deionized water;
(2) and cleaning the polished aluminum profile for 2-3 times by using deionized water after polishing, and then placing the aluminum profile in a vacuum drying oven at the temperature of 140-150 ℃ for drying for 20-30 minutes.
The epoxy resin used was No. 604 epoxy resin.
Compared with the prior art, the invention has the following advantages: in order to solve the problem of poor wear resistance of the surface of the aluminum profile, the invention provides the powder coating for improving the wear resistance and the wear reduction of the surface of the aluminum profile. The powder coating prepared by the invention is applied to the surface of an aluminum profile, has good associativity, shows excellent adhesion capacity when being coated on the surface of the aluminum profile, has higher mechanical strength, good weather resistance, chemical resistance, scratch resistance and abrasion resistance, can not be damaged or failed, has very strong abrasion resistance and wear resistance and higher chemical corrosion resistance, plays an excellent protection role in various complex environments, can bear the erosion wear of gas, solid and liquid, has excellent outdoor stability, and prolongs the service life of the aluminum profile. The invention overcomes the problems of poor wear resistance, poor application performance and the like of the epoxy resin powder coating, solves the defects of poor erosion and wear resistance, poor adsorption capacity on the surface of an aluminum profile and the like of the existing powder coating, has simple preparation technology and process method, low cost, good corrosion resistance and strong protective effect, is suitable for outdoor environment and batch production, greatly reduces the production cost of enterprises, and brings more economic benefits and social benefits; the method has a very wide application prospect, promotes the application and development of the powder coating in the aspect of processing and producing the aluminum profile, promotes the upgrading of product performance, can realize the practical significance of improving the coating functionality of the powder coating on the surface of the aluminum profile and improving the market competitiveness, obviously promotes the rapid development of the modernized powder coating industry and the environmental protection industry and the sustainable development of resources, and is a technical scheme which is very worthy of popularization and use.
Detailed Description
In order to make the objects, technical solutions and effects of the present invention clearer and clearer, the present invention is further described with reference to specific embodiments, and it should be understood that the specific embodiments described herein are only used for explaining the present invention and are not used for limiting the technical solutions provided by the present invention.
Example 1
The powder coating for improving the wear resistance and the antifriction property of the surface of the aluminum profile takes epoxy resin as a matrix material and is processed and modified, and the preparation method specifically comprises the following steps:
step 1: placing epoxy resin into a four-neck flask provided with a stirrer, a condenser and a thermometer, adding epoxy chloropropane accounting for 14.0 percent of the mass of the epoxy resin, 1, 4-dimethylolcyclohexane accounting for 3.4 percent of the mass of the epoxy resin and tetramethylammonium chloride accounting for 7.0 percent of the mass of the epoxy resin, heating to 57 ℃ under the stirring of 270 r/min, introducing nitrogen, adding a sodium hydroxide solution with the molar concentration of 7.6 mol/l through a dropping funnel, adjusting the pH value of the system to be between 11.2 and 11.6, continuously heating to 77 ℃, stirring for reaction for 1 hour, closing the nitrogen, preserving the temperature for 2 hours, after the reaction is finished, placing the product into a rotary evaporator for decompressing and recycling residual solvent, washing for 3 times by using distilled water, and then placing into a vacuum drying oven with the temperature of 80 ℃ for drying to constant weight to obtain;
step 2: uniformly mixing the modified epoxy resin obtained in the step 1 with a filler, a curing agent, a leveling agent and an anti-scratching agent according to a weight ratio of 60:30:0.6:1.0:0.4, adding the mixture into a mixer for pretreatment, stirring and mixing at a low speed of 180 revolutions per minute for 20 minutes, preserving heat at 80 ℃ for 15 hours, stirring at a high speed of 1000 revolutions per minute for 10 minutes, transferring the mixture to a melt extruder, performing melt mixing extrusion at an extrusion temperature of 85 ℃, performing tabletting when the temperature is cooled to 20 ℃, and crushing the mixture by a high-speed universal crusher through a 420-mesh standard sieve to obtain the powder coating.
The filler is prepared from the following components in parts by weight: 18 parts of calcium silicate, 7 parts of titanium dioxide, 2.5 parts of sodium silicate and 3.2 parts of aluminum oxide.
The anti-scratch agent comprises the following components in percentage by mass: 25% of silicone powder, 10% of superfine silicon dioxide, 10% of talcum powder, 8% of montmorillonite, 2% of sodium stearate, 3% of graphite powder and the balance of calcium oxide.
The coating process comprises the following steps: and spraying the prepared powder coating on the surface of the pretreated aluminum profile by using electrostatic spraying equipment, wherein the coating thickness is between 100 and 120 micrometers, cooling in air for 30 minutes after spraying, leveling in a 120 ℃ drying oven for 10 minutes, and then curing for 20 minutes.
The method for processing the pre-processed aluminum profile comprises the following steps: (1) carrying out surface degreasing and polishing on the aluminum profile: wiping the surface with acetone, immersing the surface in a hexadecyl trimethyl ammonium bromide aqueous solution with the mass concentration of 0.8% and the temperature of 35 ℃, oscillating and cleaning for 3 minutes, drying the surface in a drying oven at the temperature of 60 ℃, and then performing polishing treatment, wherein the polishing temperature is 60 ℃, and the polishing time lasts for 2 minutes; the polishing solution is prepared from the following components in percentage by mass: 1.0% of sodium percarbonate, 0.7% of sodium perborate, 0.35% of potassium perborate, 0.02% of barium carbonate, 0.3% of calcium oxide, 0.05% of anionic surfactant and the balance of deionized water;
(2) and cleaning the polished aluminum profile for 2 times by using deionized water after polishing, and then placing the aluminum profile in a vacuum drying oven at the temperature of 140 ℃ for drying for 20 minutes.
The epoxy resin used is No. 604 epoxy resin;
the flatting agent is GLP588 produced by Ningbo south sea chemical company Limited, and the curing agent is EDL-CR 320.
And (3) performance testing: the powder coating prepared in example 1 was sprayed with LD6063 aluminum profile as the test object. Erosion test with silicon carbide as the erosion particle and an average particle size of 100 μm, density of g/cm3, supply amount of 3.2g/min, air pressure of 0.09MPa, erosion angle of 45 deg., nozzle 10 mm away from sample surface, and erosion wear rate of 0.188g m-2·h-1。
Other properties: measuring the surface hardness and the elastic modulus of the powder coating by adopting HM2000S equipment, wherein the test force is 50mN, the loading time is 15 seconds, and each test is carried out for 3 times to obtain the powder coating with the surface hardness of 36.7HV and the elastic modulus of 7.04 GPa; after a salt spray test for 600 hours, the surface of the aluminum profile does not blister and the coating does not fall off.
Example 2
The powder coating for improving the wear resistance and the antifriction property of the surface of the aluminum profile takes epoxy resin as a matrix material and is processed and modified, and the preparation method specifically comprises the following steps:
step 1: placing epoxy resin into a four-neck flask provided with a stirrer, a condenser and a thermometer, adding epoxy chloropropane accounting for 14.3 percent of the mass of the epoxy resin, 1, 4-dimethylolcyclohexane accounting for 3.5 percent of the mass of the epoxy resin and tetramethylammonium chloride accounting for 7.2 percent of the mass of the epoxy resin, heating to 57.5 percent of the mass of the epoxy resin under stirring at 280 revolutions per minute, introducing nitrogen, adding a sodium hydroxide solution with the molar concentration of 7.7 moles per liter through a dropping funnel, adjusting the pH value of the system to be between 11.2 and 11.6, continuously heating to 77.5 ℃, stirring and reacting for 1.5 hours, closing the nitrogen, keeping the temperature for 2.5 hours, after the reaction is finished, placing the product into a rotary evaporator, decompressing and recovering the residual solvent, washing for 4 times by using distilled water, and then placing into a vacuum drying oven at 85 ℃ to dry to;
step 2: uniformly mixing the modified epoxy resin obtained in the step 1 with a filler, a curing agent, a leveling agent and an anti-scratching agent according to a weight ratio of 65:33:0.7:1.1:0.5, adding the mixture into a mixer for pretreatment, stirring and mixing at a low speed of 190 revolutions per minute for 25 minutes, preserving heat at 83 ℃ for 16 hours, stirring at a high speed of 1100 revolutions per minute for 13 minutes, transferring the mixture to a melt extruder, performing melt mixing extrusion at an extrusion temperature of 90 ℃, performing tabletting when the mixture is cooled to 25 ℃, and crushing the mixture by a high-speed universal crusher through a standard sieve with 430 meshes to obtain the powder coating.
The filler is prepared from the following components in parts by weight: 20 parts of calcium silicate, 8 parts of titanium dioxide, 2.6 parts of sodium silicate and 3.4 parts of aluminum oxide.
The anti-scratch agent comprises the following components in percentage by mass: 30% of silicone powder, 11% of superfine silicon dioxide, 12% of talcum powder, 9% of montmorillonite, 2.5% of sodium stearate, 4% of graphite powder and the balance of calcium oxide.
The coating process comprises the following steps: and spraying the prepared powder coating on the surface of the pre-treated aluminum profile by using electrostatic spraying equipment, wherein the coating thickness is between 100 and 120 micrometers, cooling in air for 35 minutes after spraying, leveling in a 122 ℃ oven for 12 minutes, and curing for 22 minutes.
The method for processing the pre-processed aluminum profile comprises the following steps: (1) carrying out surface degreasing and polishing on the aluminum profile: wiping the surface with acetone, immersing the surface in a hexadecyl trimethyl ammonium bromide aqueous solution with the mass concentration of 0.9% and the temperature of 38 ℃, oscillating and cleaning for 4 minutes, drying the surface in a drying oven at the temperature of 65 ℃, and then carrying out polishing treatment, wherein the polishing temperature is 62 ℃, and the polishing time lasts for 2.5 minutes; the polishing solution is prepared from the following components in percentage by mass: 1.3 percent of sodium percarbonate, 0.8 percent of sodium perborate, 0.36 percent of potassium perborate, 0.04 percent of barium carbonate, 0.35 percent of calcium oxide, 0.06 percent of anionic surfactant and the balance of deionized water;
(2) and cleaning the polished aluminum profile for 2 times by using deionized water after polishing, and then placing the aluminum profile in a vacuum drying oven at 145 ℃ for drying for 25 minutes.
The epoxy resin used is No. 604 epoxy resin;
the flatting agent is GLP588 produced by Ningbo south sea chemical company Limited, and the curing agent is EDL-CR 320.
And (3) performance testing: the powder coating prepared in example 2 was sprayed with LD6063 aluminum profile as the test object. Erosion test using silicon carbide as erosion particles, average particle size of 100 μm, density of g/cm3, supply amount of 3.2g/min, air pressure of 0.09MPa, nozzle distance of 10 mm from sample surface at erosion angle of 45 deg., erosion wear rate of 0.179g · m-2·h-1。
Other properties: measuring the surface hardness and the elastic modulus of the powder coating by adopting HM2000S equipment, wherein the test force is 50mN, the loading time is 15 seconds, and each test is carried out for 3 times to obtain the powder coating with the surface hardness of 36.8HV and the elastic modulus of 7.08 GPa; after a salt spray test for 600 hours, the surface of the aluminum profile does not blister and the coating does not fall off.
Example 3
The powder coating for improving the wear resistance and the antifriction property of the surface of the aluminum profile takes epoxy resin as a matrix material and is processed and modified, and the preparation method specifically comprises the following steps:
step 1: placing epoxy resin into a four-neck flask provided with a stirrer, a condenser and a thermometer, adding epoxy chloropropane accounting for 14.7 percent of the mass of the epoxy resin, 1, 4-dimethylolcyclohexane accounting for 3.8 percent of the mass of the epoxy resin and tetramethylammonium chloride accounting for 7.5 percent of the mass of the epoxy resin, heating to 58 ℃ under the stirring of 300 r/min, introducing nitrogen, adding a sodium hydroxide solution with the molar concentration of 7.9 mol/l through a dropping funnel, adjusting the pH value of the system to be between 11.2 and 11.6, continuously heating to 78 ℃, stirring for reaction for 2 hours, closing the nitrogen, preserving the temperature for 3 hours, after the reaction is finished, placing the product into a rotary evaporator for decompressing and recycling residual solvent, washing for 5 times by using distilled water, and then placing into a vacuum drying oven at 90 ℃ for drying to constant weight to obtain modified epoxy resin;
step 2: uniformly mixing the modified epoxy resin obtained in the step 1 with a filler, a curing agent, a leveling agent and an anti-scratching agent according to a weight ratio of 70:36:0.8:1.3:0.7, adding the mixture into a mixer for pretreatment, stirring and mixing at a low speed of 200 revolutions per minute for 30 minutes, preserving heat at 85 ℃ for 18 hours, stirring at a high speed of 1200 revolutions per minute for 15 minutes, transferring the mixture to a melt extruder, performing melt mixing extrusion at an extrusion temperature of 95 ℃, performing tabletting when the mixture is cooled to 30 ℃, and crushing the mixture by a high-speed universal crusher through a standard sieve with 450 meshes to obtain the powder coating.
The filler is prepared from the following components in parts by weight: 23 parts of calcium silicate, 10 parts of titanium dioxide, 2.7 parts of sodium silicate and 3.6 parts of aluminum oxide.
The anti-scratch agent comprises the following components in percentage by mass: 35% of silicone powder, 12% of superfine silicon dioxide, 15% of talcum powder, 10% of montmorillonite, 3% of sodium stearate, 5% of graphite powder and the balance of calcium oxide.
The coating process comprises the following steps: and spraying the prepared powder coating on the surface of the pretreated aluminum profile by using electrostatic spraying equipment, wherein the coating thickness is between 100-120 microns, cooling in air for 40 minutes after spraying, leveling in an oven at 125 ℃ for 15 minutes, and curing for 25 minutes.
The method for processing the pre-processed aluminum profile comprises the following steps: (1) carrying out surface degreasing and polishing on the aluminum profile: wiping the surface with acetone, immersing the surface in 1.0% hexadecyl trimethyl ammonium bromide aqueous solution at the temperature of 40 ℃, oscillating and cleaning for 5 minutes, drying the surface in a drying oven at the temperature of 70 ℃, and then performing polishing treatment, wherein the polishing temperature is 65 ℃, and the polishing time lasts for 3 minutes; the polishing solution is prepared from the following components in percentage by mass: 1.5% of sodium percarbonate, 0.9% of sodium perborate, 0.38% of potassium perborate, 0.05% of barium carbonate, 0.4% of calcium oxide, 0.08% of anionic surfactant and the balance of deionized water;
(2) and cleaning the polished aluminum profile for 3 times by using deionized water after polishing, and then placing the aluminum profile in a vacuum drying oven at 150 ℃ for drying for 30 minutes.
The epoxy resin used is No. 604 epoxy resin;
the flatting agent is GLP588 produced by Ningbo south sea chemical company Limited, and the curing agent is EDL-CR 320.
And (3) performance testing: the powder coating prepared in example 3 was sprayed with LD6063 aluminum profile as the test object. Erosion test using silicon carbide as erosion particles, average particle size of 100 μm, density of g/cm3, supply amount of 3.2g/min, air pressure of 0.09MPa, nozzle distance of 10 mm from sample surface at erosion angle of 45 deg., erosion wear rate of 0.187g · m-2·h-1。
Other properties: measuring the surface hardness and the elastic modulus of the powder coating by adopting HM2000S equipment, wherein the test force is 50mN, the loading time is 15 seconds, and each test is carried out for 3 times to obtain the powder coating with the surface hardness of 36.7HV and the elastic modulus of 7.05 GPa; after a salt spray test for 600 hours, the surface of the aluminum profile does not blister and the coating does not fall off.
Claims (5)
1. The powder coating for improving the wear resistance and the antifriction property of the surface of the aluminum profile is characterized by comprising the following steps:
(1) placing the epoxy resin into a four-neck flask provided with a stirrer, a condenser and a thermometer, adding epoxy chloropropane accounting for 14.0-14.7 percent of the mass of the epoxy resin, 1, 4-dimethylolcyclohexane accounting for 3.4-3.8 percent of the mass of the epoxy resin, tetramethylammonium chloride accounting for 7.0-7.5 percent of the mass of the epoxy resin, heating to 57-58 ℃ under stirring at 300 revolutions per minute at 270 ℃, introducing nitrogen, adding sodium hydroxide solution through a dropping funnel, adjusting the pH value of the system to 11.2-11.6, continuously heating to 77-78 ℃, stirring and reacting for 1-2 hours, closing nitrogen, preserving heat for 2-3 hours, after the reaction is finished, putting the product in a rotary evaporator, decompressing and recovering the residual solvent, washing the product for 3-5 times by using distilled water, and then putting the product in a vacuum drying oven at 80-90 ℃ to dry the product to constant weight to obtain modified epoxy resin;
(2) uniformly mixing the modified epoxy resin obtained in the step (1) with a filler, a curing agent, a leveling agent and an anti-scratching agent according to the weight ratio of 60-70:30-36:0.6-0.8:1.0-1.3:0.4-0.7, adding the mixture into a mixer for pretreatment, stirring and mixing at a low speed of 200 revolutions per minute for 20-30 minutes at 180-.
2. The powder coating for improving the wear resistance and the friction reduction of the surface of the aluminum profile as claimed in claim 1, wherein the molar concentration of the sodium hydroxide solution in the step (1) is 7.6-7.9 mol/l.
3. The powder coating for improving the wear resistance and the abrasion resistance of the surface of the aluminum profile as claimed in claim 1, wherein the filler in the step (2) is prepared from the following components in parts by weight: 18-23 parts of calcium silicate, 7-10 parts of titanium dioxide, 2.5-2.7 parts of sodium silicate and 3.2-3.6 parts of aluminum oxide.
4. The powder coating for improving the wear resistance and the friction reduction of the surface of the aluminum profile as claimed in claim 1, wherein the anti-scratching agent in the step (2) comprises the following components in percentage by mass: 25-35% of silicone powder, 10-12% of superfine silicon dioxide, 10-15% of talcum powder, 8-10% of montmorillonite, 2-3% of sodium stearate, 3-5% of graphite powder and the balance of calcium oxide.
5. The powder coating for improving the wear resistance and the friction reduction of the surface of the aluminum profile as claimed in claim 1, wherein the powder coating process comprises the following steps: and spraying the prepared powder coating on the surface of the aluminum profile subjected to degreasing and polishing treatment by using electrostatic spraying equipment, wherein the coating thickness is between 100 and 120 microns.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116200098A (en) * | 2023-02-17 | 2023-06-02 | 广东涂墨技术有限公司 | Wear-resistant high-hardness powder coating and preparation method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116200098A (en) * | 2023-02-17 | 2023-06-02 | 广东涂墨技术有限公司 | Wear-resistant high-hardness powder coating and preparation method thereof |
| CN116200098B (en) * | 2023-02-17 | 2023-08-15 | 广东涂墨技术有限公司 | Wear-resistant high-hardness powder coating and preparation method thereof |
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