CN114836110A - Nano modified hot-dip galvanized polyester coating and preparation method thereof - Google Patents
Nano modified hot-dip galvanized polyester coating and preparation method thereof Download PDFInfo
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- CN114836110A CN114836110A CN202210469151.6A CN202210469151A CN114836110A CN 114836110 A CN114836110 A CN 114836110A CN 202210469151 A CN202210469151 A CN 202210469151A CN 114836110 A CN114836110 A CN 114836110A
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- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 56
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Images
Classifications
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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
- C09D167/00—Coating compositions based on polyesters obtained by reactions forming a carboxylic ester link in the main chain; Coating compositions based on derivatives of such polymers
-
- 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
- B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
-
- 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
-
- 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
- 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
-
- 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
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/08—Anti-corrosive paints
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
- C23C2/06—Zinc or cadmium or alloys based thereon
-
- 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
- B05D2508/00—Polyesters
-
- 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
- B05D2601/00—Inorganic fillers
- B05D2601/20—Inorganic fillers used for non-pigmentation effect
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/30—Sulfur-, selenium- or tellurium-containing compounds
- C08K2003/3045—Sulfates
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/011—Nanostructured additives
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Paints Or Removers (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
The invention relates to a preparation method of a nano modified hot-dip galvanized polyester coating. The coating comprises the following components: polyester resin, curing agent, filler, pigment, auxiliary agent and the like, and the nano silicon dioxide subjected to hydrophobic modification. The coating has good weather resistance, corrosion resistance and self-cleaning property, and can be used for coating facilities such as guardrails, advertising boards and the like.
Description
Technical Field
The invention relates to a nano modified hot-dip galvanized polyester coating and a preparation method thereof, belonging to the technical field of powder coatings.
Background
The steel member has the comprehensive advantages of high standardization degree, light dead weight, factory manufacture, quick installation, short construction period, good earthquake resistance, obvious engineering economic advantage, no environmental pollution and the like, and is widely applied. However, corrosion is the main cause and form of failure of the metal steel member, so that economic loss is also very remarkable, and if the corrosion prevention problem of the steel member cannot be solved well, the maintenance cost of the road is greatly increased, and even early reduction and loss of the basic function of part of the road can be caused. Therefore, it is increasingly important to adopt various measures to reduce and delay corrosion, improve the safety, reliability and aesthetic property of steel components and prolong the service life.
Hot dip plating is a conventional metal corrosion prevention technique. In general, hot dip coating is less costly than other protective coating techniques because other protective coatings such as sanding, painting are labor intensive processes, whereas hot dip coating processes are highly mechanized, tightly controlled in-plant operations. However, according to the relevant regulations of the new environmental protection Law in China, hot galvanizing is definitely an outdated coating process which is about to be eliminated gradually. In the industrial field, the application of polyester coating extends from the vigorous development of acrylic resin in the 60 th 20 th century, the high-performance coating is rapidly developed in the fields of aviation, rail transit, automobiles, marine equipment, petroleum equipment, mechanical equipment, infrastructure construction, energy construction and steel structure corrosion prevention, a polyester coating is sprayed on a hot-dip galvanized metal member, and a double coating formed by a hot-dip galvanized coating on an inner layer and a polyester coating on an outer layer is widely applied to the metal steel member.
CN103194140A does not use pigments and fillers with excellent weather resistance in polyester system. Therefore, the short plates exist in part of materials of the cured coating formed by mixing the two system powders, so that the service life of the coating in practical application is influenced, the coating is pulverized, and the self-cleaning function is reduced or lost.
CN200971478Y discloses a highway guardrail with a hot zinc spraying and aluminum spraying polyester composite coating, belonging to the field of traffic facilities. The surface of the guardrail plate, the upright post, the post cap and the guardrail base material of the connecting piece is a composite coating with a multi-coating structure which is tightly combined with the guardrail plate, the upright post, the post cap and the guardrail base material of the connecting piece; the composite coating of the multi-coating structure sequentially comprises the following components from inside to outside: hot sprayed zinc layer, hot sprayed aluminum or aluminum alloy layer, pure polyester thermosetting powder coating layer. The beneficial effects of the utility model are that, hot spraying aluminium combines with hot spraying zinc, and full play spouts zinc and protects and spouts the complementary effect of advantage that aluminium is with low costs well. CN208859098U the utility model relates to an industrial manufacturing technical field just discloses an anticorrosive anticreep skin type galvanized steel pipe, thereby utilizes at hot-galvanize coating zinc-plated coating once more, realizes the dual corrosion resisting capability of steel pipe, thereby cooperates the anticreep skin coating again to realize carrying out the anticreep skin protection to the surface of steel pipe, avoids desquamating influence the outward appearance of steel pipe.
CN207686184U discloses a high durability polyester coating metal stamp decorative board, it contains plate body, stamp, stock solution box, lid, control switch, work pilot lamp, electronic hydraulic push rod, brush board, brush silk, polyester coating, charge pilot lamp, the interface that charges, battery, handle, anticorrosive paint, the positive lower extreme of plate body is provided with the stock solution box, the stock solution box upper end is provided with the lid, the stock solution box openly inlays and has control switch. The utility model has the advantages that: this high durability polyester coating metal printing decorative board can be regularly do polyester coating coats with paint anticorrosive paint, anticorrosive paint adopts colorless transparent waterborne ultraviolet protection coating, and it can not influence make when metal printing decorative board appearance is pleasing to the eye metal printing decorative board surface polyester coating avoids the erosion of wind-blown sunlight, prolongs polyester coating's life, and the practicality is good.
CN111992475A provides a preparation method of a guardrail with a zinc epoxy-based polyester composite coating, which comprises the following steps: pretreating, coating epoxy zinc-based spraying raw materials on the surfaces of the guardrail plate and the vertical pipe, carrying out thermosetting treatment on the coating, uniformly coating polyester spraying raw materials on the surface of the epoxy zinc-based coating, and curing. The guardrail prepared by the invention is bright and clean, has good naturalness, is not easy to stain, and can be naturally washed by rainwater; the salt spray resistance is good; has good humidity and heat resistance.
In summary, our country focuses on research and discussion of some aspect in the composite coating technology.
Disclosure of Invention
The invention aims at solving the problem of protecting outdoor steel members, and effectively achieves the aim of preventing metal from losing efficacy by covering the nano modified polyester coating on the basis of the hot-dip galvanizing coating. The steel plate has good applicability to outdoor steel components such as highway guardrails, advertisement display boards and the like in various places. The invention provides a nano modified hot-dip galvanized polyester coating and a preparation method thereof, wherein the concept of double coatings on the same substrate is adopted, the nano modified polyester coating is prepared, and the characteristics of mesoporous diffuse reflection, small size and the like of nano powder are utilized by an electrostatic spraying method, so that the ultraviolet resistance and the surface self-cleaning performance of the coating are improved, the damage of the coating is prevented, the service life of the coating is prolonged, and the aim of preventing metal failure is effectively fulfilled.
The nano modified hot-dip galvanized polyester coating comprises a zinc coating and a polyester coating coated on the zinc coating, wherein the polyester coating comprises the following components in percentage by weight as raw materials:
the preparation method of the nano hydrophobic silicon dioxide comprises the following steps:
and immersing the nano silicon dioxide particles into a solution containing alkyl silane for reaction, and washing and drying after the reaction is finished.
The nano silicon dioxide particles are silicon dioxide by a precipitation method or a gas phase method.
The alkylsilane is hexadecyl trimethoxy silane, and the concentration of the alkylsilane in the solution is 0.01-0.03 mmol/L.
The reaction time in the reaction process is 12-24 hours, and the reaction temperature is 20-60 ℃.
The preparation method of the nano modified hot-dip galvanized polyester coating comprises the following steps:
step 1, galvanizing the surface of a metal part;
step 2, coating polyester paint on the surface of the zinc coating in an electrostatic spraying mode to form a polyester coating;
and step 3, obtaining the coating after heating and melting, leveling, curing and cooling.
The preparation method of the polyester coating comprises the following steps:
mixing other components except the nano hydrophobic silica in the raw materials of the polyester coating, performing melt extrusion, cooling, and then performing crushing treatment to obtain a powder mixture; and then mechanically stirring the powder mixture and the nano hydrophobic silicon dioxide, and adding ultrasonic to mix to obtain the polyester coating.
The linear speed of mechanical stirring is required to be 5-40 m/s, and the total time of mechanical stirring is controlled to be 2-10 minutes.
In the step 2, the input voltage of the electrostatic spraying mode is 220V, the electrostatic output of the spray gun is 30-120 KV, the spraying distance is 10-20 cm, and the powder supply pressure is 0.3-0.8 Mpa.
The coating thickness is controlled to be 50-140 μm.
The temperature of the heating and melting process is 100-270 ℃, and the curing time is 5-45 minutes.
The hydrophobic modified nano silicon oxide is used for improving the ultraviolet resistance of polyester powder coating.
Advantageous effects
Inorganic powder additives such as barium sulfate and the like added in the production of conventional powder coatings can effectively reduce the damage depth of ultraviolet rays due to good reflectivity after being added into a polyester coating, as shown in the left side of fig. 1. Compared with common inorganic powder, the nano particles are small in size, the number of the particles is exponentially increased under the condition of equal mass addition, the particles are uniformly dispersed in the coating, ultraviolet rays can contact the nano particles in a short distance after being transmitted into the coating, and the short distance can be rapidly attenuated under the extremely strong ultraviolet and infrared reflection characteristics of the nano particles, so that the penetration depth is reduced theoretically ((R) 3 -r 3 )/R 3 ) R is the particle size of the common inorganic powder additive, and R is the particle size of the nano hydrophobic silica, as shown on the right side of the figure 1. For example, in a polyester coating to which a volume of 30 μm particle size inorganic powder was added, the ultraviolet transmission depth was 3 μm, which has an indirect relationship with the number of particles. In the polyester coating added with the same volume of 30 nm-diameter nano powder, the radius of the nano powder is 10 of that of the inorganic powder -3 The number of particles is 10 of the number of particles of the inorganic powder 9 Therefore, the transmission depth is theoretically reduced by 99.9999999%.
The electrostatic spraying system is adopted in the invention, so that the coating and the galvanized coating are combined more tightly, the adhesion of the coating is improved, and the service life of the coating is greatly prolonged. The nano silicon dioxide has the characteristic of large specific surface area, so that a net structure is easily formed in the coating, and the strength of the coating is improved. By introducing the nano silicon dioxide into the polyester coating, the contact angle of the coating is improved, the contamination resistance is improved, and the self-cleaning performance of the coating is greatly improved. The ultraviolet ray can destroy the bonds of C-H, C-C and the like in organic matters and substances with the bond energy, and the nano silicon dioxide has extremely strong ultraviolet and infrared reflection characteristics and can play a role in shielding when being added into the coating, so that the ultraviolet resistance of the coating is improved. And after the nano silicon dioxide is subjected to hydrophobic modification, the material is less prone to secondary agglomeration and difficult to disperse, the interface compatibility of an inorganic phase and an organic phase is improved, and the binding force with a polymer is enhanced.
The method of the invention is adopted, the preparation process equipment of the hot-dip galvanized polyester coating is not required to be changed, the method of the invention is only used for powder modification before the polyester powder is sprayed, the thermosetting temperature of the polyester coating is not specially limited, the operation is convenient, the availability of the device and the equipment is greatly improved, and the method has greater universal applicability to factory production. The invention carries out modification optimization on the polyester coating, and greatly improves the salt spray resistance, weather resistance and self-cleaning function of the material on the premise of not influencing the mechanical and physical properties and corrosion resistance of the polyester coating. The protective device can be widely applied to high-speed highway guardrail facilities such as breast boards, stand columns, bolts and the like, and can also be used for protecting large-scale engineering machinery and other steel structures.
In the existing stage of the melt blending process of powder mixing, extrusion, bracing, cooling, grain cutting and drying are required after melt blending. The mechanical stirring ultrasonic mixing process adopted in the invention can ensure the uniformity of powder mixing, simultaneously save the energy consumption problem in melt blending, and compound the national requirements of energy conservation and emission reduction.
Drawings
FIG. 1 is a diagram of the technical concept of this patent;
FIG. 2 is a graph showing the results of an impact resistance test;
FIG. 3 is a graph of adhesion test results;
FIG. 4 is a photograph of a dried plaque after 900 hours of cycling salt spray resistance test of the polyester coating;
FIG. 5 is a photograph of a dried plate after 900 hours of cyclic salt spray resistance test using a coating of nano-silica;
Detailed Description
The examples are intended to further illustrate the invention, but not to limit the scope of the invention. Modifications and substitutions to methods, procedures, or conditions of the invention may be made without departing from the spirit and substance of the invention. Unless otherwise specified, the technical means used in the examples are conventional means well known to those skilled in the art.
The performance test methods are as follows:
1. and (3) testing mechanical physical properties (adhesive force, bending resistance, impact resistance, wear resistance and coating hardness) by referring to national standard GB/T18226-2015 anticorrosion technical conditions for steel members in highway traffic engineering.
2. The corrosion resistance is tested by referring to national standard GB/T18226-2015 technical terms for corrosion prevention of steel members in road traffic engineering and GB/T22040-2008 weather resistance requirement and test method of plastic products of facilities along roads
3. And (3) self-cleaning performance test, which refers to a test method of the stain resistance of the coating of the exterior wall paint in the national standard GB/T9780-2013 'test method of the stain resistance of the coating of the building paint'.
4. The ultraviolet aging resistance test conditions are as follows: illumination: 60 ℃/4h, condensation: 50 ℃/4h, lamp tube: UVA-340, irradiance: 0.78W/m 2 And tested for 2000 hours. And carrying out comprehensive grade evaluation by testing the discoloration grade, the powdering grade, the foaming grade, the rusting grade and the peeling grade of the coating before and after aging.
The polyester powder coatings used in the following examples were prepared as follows: the composition comprises the following components in percentage by weight: 64% of polyester resin, 4.5% of triglycidyl isocyanurate, 11% of titanium dioxide, 14% of barium sulfate, 0.4% of benzoin, 0.8% of acrylic copolymer, 3.3% of nano hydrophobic silica, 0.5% of wax powder and 1.5% of pigment. In the preparation process, the raw materials are mixed, melted and extruded, and crushed after being cooled to obtain a powder mixture;
the electrostatic spraying process in the following examples allows the parameters to be adjusted according to the actual situation, with the main parameter ranges: the input voltage is 220V, the electrostatic output of the spray gun is 30-120 KV, the spraying distance is 10-20 cm, and the powder supply pressure is 0.3-0.8 Mpa. Finally, the coating thickness is controlled to be 50-140 μm.
Example 1:
(1) preparing a powder coating: after the polyester powder coating is normally prepared, 2Kg of the polyester powder coating is weighed, 1 percent by mass of nano hydrophobic silica powder with the average particle size of 30nm is added, and mechanical stirring and ultrasonic mixing are carried out according to the linear velocity of 35m/s for 3 minutes, so as to obtain the nano modified polyester powder coating. Meanwhile, polyester powder coating without added nano modified powder is adopted for comparison.
(2) Preparing a coating: the method comprises the steps of respectively coating a nano modified polyester coating and a polyester powder coating without nano powder on two hot-dip galvanized steel plates by adopting electrostatic spraying, placing a sample in an oven for heating, adjusting the temperature to 190 ℃, curing for 12 minutes, taking out the sample after cooling to obtain a coating, and carrying out a comparison experiment on the two coatings. Experiments show that the nano modified hot-dip galvanized polyester coating does not influence the adhesive force of the coating before being modified.
Example 2:
(1) preparing a powder coating: after the polyester powder coating is normally prepared, 2Kg of the polyester powder coating is weighed, 1 percent by mass of nano hydrophobic silica powder with the average particle size of 50nm is added, the powder is prepared by a gas phase method, and mechanical stirring and ultrasonic mixing are carried out according to the linear velocity of 35m/s for 5 minutes, so that the nano modified polyester powder coating is obtained. Meanwhile, polyester powder coating without added nano modified powder is adopted for comparison.
(2) Preparing a coating: the method comprises the steps of respectively coating a nano modified polyester coating and a polyester powder coating without nano powder on two hot-dip galvanized steel plates by adopting electrostatic spraying, placing a sample in an oven to be heated, adjusting the temperature to 180 ℃, curing for 15 minutes, taking out the sample after cooling to obtain a coating, and carrying out a comparison experiment on the two coatings. Experiments show that the bending resistance of the coating before being modified is not influenced by the nano modified hot-dip galvanized polyester coating.
Example 3:
(1) preparing a powder coating: after the polyester powder coating is normally prepared, 20Kg of the polyester powder coating is weighed, 2 mass percent of nano hydrophobic silicon dioxide powder with the average particle size of 70nm is added, the powder is prepared by a precipitation method, and mechanical stirring and ultrasonic mixing are carried out according to the linear velocity of 20m/s for 8 minutes, so that the nano modified polyester powder coating is obtained. Meanwhile, polyester powder coating without added nano modified powder is adopted for comparison.
(2) Preparing a coating: the method comprises the steps of respectively coating a nano modified polyester coating and a polyester powder coating without nano powder on two hot-dip galvanized steel plates by adopting electrostatic spraying, placing a sample in an oven to be heated, adjusting the temperature to 230 ℃, curing for 7 minutes, taking out the sample after cooling to obtain a coating, and carrying out a comparison experiment on the two coatings. The experiment shows that the nano modified hot-dip galvanized polyester coating slightly improves the wear resistance of the coating.
Example 4:
(1) preparing a powder coating: after the polyester powder coating is normally prepared, 5Kg of the polyester powder coating is weighed, 5 mass percent of nano hydrophobic silicon dioxide with the average particle size of 30nm is added, and mechanical stirring and ultrasonic mixing are carried out according to the linear speed of 40m/s for 3 minutes, so as to obtain the nano modified polyester powder coating. Meanwhile, polyester powder coating without added nano modified powder is adopted for comparison.
(2) Preparing a coating: the method comprises the steps of respectively coating a nano modified polyester coating and a polyester powder coating without nano powder on two hot-dip galvanized steel plates by adopting electrostatic spraying, placing a sample in an oven to be heated, adjusting the temperature to 240 ℃, curing for 6 minutes, taking out the sample after cooling to obtain coatings, and carrying out a comparison experiment on the two coatings. Experiments show that the nano modified hot-dip galvanized polyester coating has certain improvement on the hardness of the coating.
Example 5:
(1) preparing a powder coating: after the polyester powder coating is normally prepared, 200Kg of the polyester powder coating is weighed, 7 mass percent of nano hydrophobic silica powder is added, and mechanical stirring and ultrasonic mixing are carried out according to the linear velocity of 40m/s for 2 minutes, so as to obtain the nano modified polyester powder coating. Meanwhile, polyester powder coating without added nano modified powder is adopted for comparison.
(2) Preparing a coating: the method comprises the steps of respectively coating a nano modified polyester coating and a polyester powder coating without nano powder on two hot-dip galvanized steel plates by adopting electrostatic spraying, placing a sample in an oven for heating, adjusting the temperature to 200 ℃, curing for 10 minutes, taking out the sample after cooling to obtain a coating, and carrying out a comparison experiment on the two coatings.
Fig. 2 and 3 are impact resistance tests and adhesion tests performed on 2 groups of coatings: with the gradual increase of the height, the dent caused by the impact becomes larger gradually, and the coating surface does not crack and fall off after the impact test at all the heights, which meets the specification of GBT 18226-2015. After the coating is tested by a grid drawing test, the scratch edge traces are clear, obvious cracking and falling phenomena do not exist, all samples are graded to be 0 grade, and the nano modified polyester coating still keeps good adhesiveness.
Example 7:
(1) preparing a powder coating: after the polyester powder coating is normally prepared, 50Kg of the polyester powder coating is weighed, nano hydrophobic silica powder with the mass ratio of 0.5 percent is added, the powder is prepared by a sol-gel method, and mechanical stirring and ultrasonic mixing are carried out according to the linear velocity of 30m/s for 6 minutes, so that the nano modified polyester powder coating is obtained. Meanwhile, polyester powder coating without added nano modified powder is adopted for comparison.
(2) Preparing a coating: the method comprises the steps of respectively coating a nano modified polyester coating and a polyester powder coating without nano powder on two hot-dip galvanized steel plates by adopting electrostatic spraying, placing a sample in an oven for heating, adjusting the temperature to 200 ℃, curing for 10 minutes, taking out the sample after cooling to obtain a coating, and carrying out a comparison experiment on the two coatings.
Fig. 4 and 5 show that small and dense bubbles appear around the scratch of the polyester coating, while the dense bubbles do not appear around the scratch of the nano modified polyester coating, and the slight bubbles of the coating are not obvious, after the coating is subjected to a 900-hour circulating salt spray resistance experiment, which indicates that the salt spray corrosion resistance of the nano modified polyester coating is greatly improved compared with that of the original polyester coating.
Example 7:
(1) preparing a powder coating: after the polyester powder coating is normally prepared, 200Kg of the polyester powder coating is weighed, nano hydrophobic silicon dioxide with the mass ratio of 0.5 percent is added, and mechanical stirring and ultrasonic mixing are carried out according to the linear velocity of 25m/s for 7 minutes, so as to obtain the nano modified polyester powder coating. Meanwhile, polyester powder coating without added nano modified powder is adopted for comparison.
(2) Preparing a coating: the method comprises the steps of respectively coating a nano modified polyester coating and a polyester powder coating without nano powder on two hot-dip galvanized steel plates by adopting electrostatic spraying, placing a sample in an oven for heating, adjusting the temperature to 180 ℃, curing for 20 minutes, taking out the sample after cooling to obtain a coating, and carrying out a comparison experiment on the two coatings.
The two coatings were subjected to a UV aging test under the following conditions: illumination: 60 ℃/4h, condensation: 50 ℃/4h, lamp tube: UVA-340, irradiance: 0.78W/m 2 And tested for 2000 hours. Comprehensive grading evaluation is carried out by testing the discoloration grade, the powdering grade, the blistering grade, the rusting grade and the spalling grade of the coating before and after aging
The results show that: after 2000 hours of ultraviolet aging test, 2 groups of samples have no phenomena of chalking, cracking, bubbling, peeling and the like, but the 1# sample has serious color change, the color difference value is 13.04, the 2# sample slightly changes color, the 1# sample is comprehensively rated at grade 3, the 2# sample is comprehensively rated at grade 1, and the ultraviolet aging resistance of the 2# sample is superior to that of the 1# sample.
Example 8:
(1) preparing a powder coating: after the polyester powder coating is normally prepared, 200Kg of the polyester powder coating is weighed, 2 mass percent of nano hydrophobic silica is added, and mechanical stirring and ultrasonic mixing are carried out according to the linear velocity of 30m/s for 5 minutes, so as to obtain the nano modified polyester powder coating. Meanwhile, polyester powder coating without added nano modified powder is adopted for comparison.
(2) Preparing a coating: the method comprises the steps of respectively coating a nano modified polyester coating and a polyester powder coating without nano powder on two hot-dip galvanized steel plates by adopting electrostatic spraying, placing a sample in an oven for heating, adjusting the temperature to 180 ℃, curing for 20 minutes, taking out the sample after cooling to obtain a coating, and carrying out a comparison experiment on the two coatings.
The self-cleaning functions of the 2 groups of samples are compared by testing the contact angle and the stain resistance of the 2 groups of samples, wherein the stain resistance test refers to a test method of the stain resistance of the coating of the exterior wall paint in GB/T9780-2013 'test method of the stain resistance of the coating of the building paint', and the test results are as follows:
the result shows that the contact angle of the No. 2 coating sample is slightly higher than that of the No. 1 coating, the change rate of the reflection coefficient of the No. 2 coating sample is smaller than that of the No. 1 coating sample after the stain resistance test, and the self-cleaning function of the No. 2 coating is better than that of the No. 1 coating sample.
Example 9:
(1) preparing a powder coating: after the polyester powder coating is normally prepared, 200Kg of the polyester powder coating is weighed, 2 mass percent of nano hydrophobic silicon dioxide powder is added, the powder is prepared by a precipitation method, mechanical stirring and ultrasonic mixing are carried out according to the linear velocity of 30m/s, and the duration is 7 minutes, so that the nano modified polyester powder coating is obtained. Meanwhile, polyester powder coating without added nano modified powder is adopted for comparison.
(2) Preparing a coating: the method comprises the steps of respectively coating a nano modified polyester coating and a polyester powder coating without nano powder on two hot-dip galvanized steel plates by adopting electrostatic spraying, placing a sample in an oven for heating, adjusting the temperature to 200 ℃, curing for 10 minutes, taking out the sample after cooling to obtain a coating, and carrying out a comparison experiment on the two coatings.
Through testing 2 groups of chemical reagent resistance, the test result shows that the nano modified polyester coating still keeps good chemical reagent corrosion resistance.
Example 10:
(1) preparing a powder coating: after the polyester powder coating is normally prepared, 200Kg of the polyester powder coating is weighed, 5% by mass of nano hydrophobic silica powder is added, and mechanical stirring and ultrasonic mixing are carried out according to the linear velocity of 30m/s for 6 minutes, so as to obtain the nano modified polyester powder coating.
(2) Preparing a coating: the method comprises the steps of respectively coating a nano modified polyester coating and a polyester powder coating without nano powder on two hot-dip galvanized steel plates by adopting electrostatic spraying, placing a sample in an oven for heating, adjusting the temperature to 200 ℃, curing for 10 minutes, taking out the sample after cooling to obtain a coating, and carrying out a comparison experiment on the two coatings.
By testing the coating thickness uniformity of the 2 groups, the test result shows that the coating spraying uniformity of the nano modified polyester coating is not influenced.
Claims (10)
1. The nano modified hot-dip galvanized polyester coating comprises a zinc coating and a polyester coating coated on the zinc coating, and is characterized in that the polyester coating comprises the following components in percentage by weight as raw materials:
2. the nano-modified hot-dip galvanized polyester coating according to claim 1, characterized in that the preparation method of the nano-hydrophobic silica comprises the following steps: and immersing the nano silicon dioxide particles into a solution containing alkyl silane for reaction, and washing and drying after the reaction is finished.
3. The nano-modified hot-dip galvanized polyester coating according to claim 2, characterized in that the nano-silica particles are precipitated or fumed silica; the alkylsilane refers to hexadecyl trimethoxy silane.
4. The nano-modified hot-dip galvanized polyester coating according to claim 2, characterized in that the concentration of alkylsilane in the solution is 0.01 to 0.03 mmol/L; the reaction time in the reaction process is 12-24 hours, and the reaction temperature is 20-60 ℃.
5. The method for preparing a nano modified hot-dip galvanized polyester coating according to claim 1, characterized in that it comprises the following steps:
step 1, galvanizing the surface of a metal part;
step 2, coating polyester paint on the surface of the zinc coating in an electrostatic spraying manner to form a polyester coating;
and step 3, obtaining the coating after heating and melting, leveling, curing and cooling.
6. The nano-modified hot-dip galvanized polyester coating according to claim 1, characterized in that the preparation method of the polyester coating comprises the following steps: mixing other components except the nano hydrophobic silica in the raw materials of the polyester coating, performing melt extrusion, cooling, and then performing crushing treatment to obtain a powder mixture; and then mechanically stirring the powder mixture and the nano hydrophobic silicon dioxide, and adding ultrasonic to mix to obtain the polyester coating.
7. The nano-modified hot-dip galvanized polyester coating according to claim 1, characterized in that the linear speed of mechanical stirring is 5-40 m/s, and the total time of mechanical stirring is controlled to be 2-10 minutes.
8. The nano-modified hot-dip galvanized polyester coating according to claim 1, wherein in the step 2, the input voltage of the electrostatic spraying mode is 220V, the electrostatic output of the spray gun is 30-120 KV, the spraying distance is 10-20 cm, and the powder supply pressure is 0.3-0.8 MPa.
9. The nano-modified hot-dip galvanized polyester coating according to claim 1, characterized in that the coating thickness is controlled to be 50-140 μm; the temperature of the heating and melting process is 100-270 ℃, and the curing time is 5-45 minutes.
10. The hydrophobic modified nano silicon oxide is used for improving the ultraviolet resistance and the hydrophobic surface self-cleaning performance of the polyester powder coating.
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