CN115044949B - Preparation device and method of modified organic anti-corrosion coating - Google Patents
Preparation device and method of modified organic anti-corrosion coating Download PDFInfo
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Abstract
The invention relates to a preparation device and a preparation method of a modified organic anti-corrosion coating, which relate to the field of anti-corrosion coating preparation, wherein the dispersion and compatibility of carbon nanotubes in the organic coating are improved by adding a polythiophene-carbon nanotube compound into the coating, the structural integrity of the coating and the adhesive force to a substrate are effectively improved, the service life of a magnet is prolonged, the inherent performance of the magnet is not influenced by the compound coating, and the thickness is uniform and controllable.
Description
Technical Field
The invention relates to the field of preparation of anti-corrosion coatings, in particular to a device and a method for preparing a modified organic anti-corrosion coating.
Background
Sintered NdFeB magnets occupy the core position of the permanent magnet material market and are widely used in various fields due to their excellent comprehensive magnetic properties (high remanence, high coercivity, high magnetic energy product) and high cost performance. However, the multiphase structure of the magnet itself causes poor corrosion resistance, thereby affecting the service stability and safety of the magnet and eventually causing economic loss, which is also a key to limit engineering application.
At present, the corrosion resistance of the magnet can be improved by two methods of alloying and surface protection coating. The alloying research mainly aims at improving the magnetic performance of the magnet, the corrosion resistance of the magnet is limited, the research is still lacking, the additional process also increases the preparation cost of the magnet, and a certain distance is left from the actual corrosion protection application of the magnet, so the industry still mainly aims at the surface protection coating. Among the numerous corrosion-resistant coatings, organic coatings have been widely focused and applied in the field of metal corrosion protection by virtue of the advantages of high cost performance, simple process, good corrosion resistance and the like.
The application document of the patent number CN105648503B discloses a preparation method of an organic coating with high weather resistance, high corrosion resistance and high wear resistance on the surface of a magnet, which has low production cost and high efficiency, and the composite coating has little influence on the magnetic performance of the magnet; the weather resistance, corrosion resistance, wear resistance and thermal shock resistance of the nano rare earth oxide/epoxy resin composite coating are all obviously improved
However, the organic coating often has pores inside due to solvent evaporation and poor wear resistance, thereby weakening the overall corrosion protection capability of the coating.
Disclosure of Invention
The invention aims to provide a preparation device and a preparation method of a modified organic anti-corrosion coating, which are used for solving the technical problem that the coating provided in the background art is weak in anti-corrosion capability.
In order to achieve the above purpose, the present invention provides the following technical solutions:
a preparation method of a modified organic anti-corrosion coating comprises the following steps of
S1, preparing a polythiophene-carbon nano tube compound: uniformly mixing a 3, 4-ethylenedioxythiophene monomer, poly (4-sodium styrene sulfonate), carboxylated carbon nanotubes and deionized water, adding sodium persulfate into the system to react for a certain time at a certain temperature, and centrifuging, washing and drying to obtain a polythiophene-carbon nanotube compound;
s2, pretreatment of the surface of the magnet: acid washing and rust removing are carried out on the sintered NdFeB magnet, and the sintered NdFeB magnet is dried after ultrasonic cleaning;
s3, dispersing the polythiophene-carbon nano tube composite into an electrophoresis liquid, immersing the sintered NdFeB magnet subjected to surface treatment into the electrophoresis liquid for electrophoretic coating, wherein the dispersion concentration of the polythiophene-carbon nano tube composite is 1-12g/L, the electrophoresis liquid is any one or more of epoxy resin, polyurethane and acrylic resin, the electrophoresis voltage is 60-100V, the electrophoresis duration is 45-60s, and the temperature of the bath liquid is 25-30 ℃;
s4, high-temperature curing, namely washing the magnet subjected to electrophoresis by deionized water, air-drying, and then performing high-temperature curing, and finally preparing the polythiophene-carbon nano tube modified organic anti-corrosion coating on the surface of the magnet.
Preferably, the mass ratio of the carboxylated carbon nano tube to the thiophene monomer in the S1 is 1:1-1:10, the carbon nano tube is single-wall or multi-wall carbon nano tube, the reaction temperature is 25-30 ℃, and the reaction time is 12-24h.
Preferably, the acid used in S2 is 3-5Vol% nitric acid, and the pickling time is 20-50.
Preferably, the curing process in the step S4 is carried out at a temperature of 90-180 ℃ for 80-120min.
The preparation device of the preparation method of the modified organic anti-corrosion coating comprises an electrophoresis tank, wherein the top of the electrophoresis tank is connected with a cover plate, an inlet and an outlet are respectively arranged at two ends of the cover plate, a linear array conveying roller is rotationally connected to the electrophoresis tank, a plurality of groups of annular array conveying rods are connected to the conveying roller, each group of conveying rods comprises a plurality of linear arrays along the axis direction of the conveying roller, and a supplementing mechanism is connected to the side face of the electrophoresis tank.
Preferably, a feeding guide plate is arranged below the inlet, extends to the side surface of the conveying roller, and one end of the feeding guide plate, which is close to the conveying roller, is lower than one end of the feeding guide plate, which is fixed in the electrophoresis tank.
Preferably, the outlet is provided with a discharging mechanism, the discharging mechanism comprises a discharging wheel rotatably connected to the side surface of the electrophoresis tank, the discharging wheel is in transmission connection with a transmission belt, and the transmission belt is rotatably connected with a discharging frame.
Preferably, the conveying rod is rotationally connected to the conveying roller, the friction wheel is fixedly connected to the conveying rod, the friction wheel is in intermittent fit contact with the friction ring, and the friction ring is fixed in the electrophoresis tank.
Preferably, the conveying roller and the conveying rod are hollow, one end of the conveying roller is communicated with the liquid storage cavity in the supplementing mechanism, the inner end of the conveying rod is communicated with the conveying roller, the inner side of the friction wheel is connected with the slide way, the side surface of the slide way is respectively provided with a through hole for communicating the inner side of the conveying rod and the end surface of the friction wheel, a sliding rod extending to the outer side of the friction wheel through the end part of the slide way is arranged in the slide way, the sliding rod is fixedly connected with the first pressing plate, the sliding rod is axially and slidably connected with the second pressing plate, and the outer end of the second pressing plate is in contact with the compression spring.
Preferably, the outer end of the pressing plate is fixedly connected with an arc plate made of spring steel, and two ends of the arc plate are arranged in a limit groove in the friction wheel.
Compared with the prior art, the invention has the beneficial effects that:
1. the dispersion and compatibility of the carbon nano tube in the organic coating are improved by adding the polythiophene-carbon nano tube compound into the coating, the structural integrity of the coating and the adhesion to a base material are effectively improved, the service life of the magnet is prolonged, the inherent performance of the magnet is not influenced by the compound coating, and the thickness is uniform and controllable;
2. dispersing the polythiophene-carbon nano tube compound in an electrophoresis tank, and controlling the thickness of the coating by controlling the dispersion concentration, electrophoresis voltage, electrophoresis duration and tank liquor temperature of the polythiophene-carbon nano tube compound;
3. the electrophoresis tank is connected with the cover plate, an inlet and an outlet are respectively arranged at two ends of the cover plate, so that the electrophoresis tank is in a closed state, the influence of the external temperature on the liquid temperature in the electrophoresis tank is reduced, and a plurality of conveying rollers connected with conveying rods are sequentially arranged in the electrophoresis tank, so that materials entering the electrophoresis tank move to be discharged out of the electrophoresis tank through a preset path in the electrophoresis tank;
4. the material guiding plate in the electrophoresis tank enables the inlet to enter the space where the magnet enters the conveying roller, the magnet is conveyed by the conveying roller, the magnet moves along with the conveying roller, the moving path in the tank liquid is wave-shaped, the moving path of the magnet in the electrophoresis tank with limited length is longer and is in uniform contact with each part of tank liquid, and the magnet after electrophoresis is discharged out of the electrophoresis tank through the discharging mechanism;
5. the conveying rod is rotationally connected to the conveying roller, and a friction wheel axially and fixedly connected with the conveying rod is intermittently attached to the friction ring, so that the conveying rod rotates to enable a magnet on the conveying rod to move in the axial direction of the conveying roller, the contact part of the conveying rod is continuously changed, and the phenomenon that a plating layer cannot be formed due to the contact part of the conveying rod and the magnet is avoided;
6. the conveying roller and the conveying rod are hollow and are provided with a slide way in the friction wheel, and the slide way is internally connected with a slide rod, so that compound replenishing liquid is stored in the slide way when the slide rod is in contact with the friction ring, and when the slide rod is separated from the friction ring, the slide rod gradually extends to extrude the stored compound replenishing liquid into the electrophoresis tank to replenish the compound concentration to keep stable.
Drawings
FIG. 1 is a cross-sectional SEM image of the original organic corrosion protection coating on the surface of a sintered NdFeB magnet;
FIG. 2 is a cross-sectional SEM image of a polythiophene-carbon nanotube modified organic corrosion protection coating on the surface of a sintered NdFeB magnet obtained in example 1;
FIG. 3 is a cross-sectional SEM image of a polythiophene-carbon nanotube modified organic corrosion protection coating on the surface of a sintered NdFeB magnet obtained in example 2;
FIG. 4 is a cross-sectional SEM image of a polythiophene-carbon nanotube modified organic corrosion protection coating on the surface of a sintered NdFeB magnet obtained in example 3;
FIG. 5 is a Bode plot of a sample electrochemical impedance spectroscopy test;
FIG. 6 is a graph of sample polarization;
FIG. 7 is a schematic view showing the structure of an electrophoresis tank according to the present invention;
FIG. 8 is a left side view of an electrophoresis tank of the present invention;
FIG. 9 is a schematic view of the structure of the discharge mechanism of the present invention;
FIG. 10 is a schematic view of the structure of a conveyor roller of the present invention;
FIG. 11 is a schematic view of the friction wheel of the present invention;
FIG. 12 is a cross-sectional view of a transfer lever of the present invention;
in the figure: 1. an electrophoresis tank; 11. an inlet; 12. an outlet; 13. a guide plate; 2. a cover plate; 3. a discharge mechanism; 31. a discharging wheel; 32. a transmission belt; 33. a discharging frame; 331. a limit rod; 4. a lead-out plate; 5. a conveying roller; 51. a connection hole; 6. a conveying rod; 7. a friction wheel; 71. a through hole; 72. a slide bar; 73. a second pressing plate; 74. a first platen; 75. a compression spring; 76. an arc plate; 77. a limit groove; 8. friction ring.
Detailed Description
Comparative example
As shown in fig. 1
(1) Magnet pretreatment
Soaking the sintered NdFeB magnet in a 3% nitric acid solution for 40s, performing ultrasonic treatment on the sintered NdFeB magnet for 1 to 2min by deionized water, washing the sintered NdFeB magnet by ethanol, and drying the sintered NdFeB magnet by cold air for later use;
(2) Cathode electrophoresis
Color paste: resin: the water was mixed uniformly in a ratio of 1:3:4, stirred at 30℃for curing for 48 hours, and then filtered to remove large particles. Taking a certain amount of electrophoresis liquid, immersing the treated sintered NdFeB magnet into the electrophoresis liquid for electrophoresis, and carrying out electrophoresis parameters: 28 ℃,60V,45s;
(3) High temperature curing
And washing the magnet after electrophoresis with deionized water, drying with cold air, and then curing at high temperature. Curing parameters: preserving heat at 90 ℃ for 40min, preserving heat at 180 ℃ for 30min, and heating at a rate of 5-8 ℃/min.
After 36 days of immersion in 3.5wt% NaCl solution, the low frequency impedance (|Z|0.01 Hz) was 1.34×10 as measured by electrochemical impedance spectroscopy 4 Ω·cm 2 . After soaking for 40 days, the corrosion potential is-0.816V, and the self-corrosion current density is 4.346 multiplied by 10 by the test of polarization curve -6 A·cm -2 。
Example 1
As shown in fig. 2, 5 and 6
(1) Preparation of polythiophene-carbon nano tube compound
First, 0.53g of poly (4-styrenesulfonate) was dissolved in 100ml of deionized water, and then 100mg of carboxylated multi-wall Carbon Nanotubes (CNTs) were added thereto for 1 hour. Then, 0.8ml of 3, 4-Ethylenedioxythiophene (EDOT) monomer was added to the above solution, and the mixture was thoroughly stirred and dispersed. Finally, 0.96g of sodium persulfate was added to the above system to initiate polymerization, and the reaction was carried out at 30℃for 24 hours. After the reaction, the obtained solution is treated by deionized water: centrifuging and washing an absolute ethyl alcohol (2:3) mixed solution, and then vacuum drying at 60 ℃ for 24 hours to obtain a polythiophene-carbon nano tube composite (PCNTs);
(2) Magnet pretreatment
Soaking the sintered NdFeB magnet in a 3% nitric acid solution for 40s, performing ultrasonic treatment on the sintered NdFeB magnet for 1 to 2min by deionized water, washing the sintered NdFeB magnet by ethanol, and drying the sintered NdFeB magnet by cold air for later use;
(3) Cathode electrophoresis
Color paste: resin: the water was mixed uniformly in a ratio of 1:3:4, stirred at 30℃for curing for 48 hours, and then filtered to remove large particles. And adding a certain amount of electrophoresis liquid into the polythiophene-carbon nano tube compound, wherein the dispersion concentration is 4g/L, and continuously stirring for 24 hours after ultrasonic treatment for 4 hours to uniformly disperse the polythiophene-carbon nano tube compound. Immersing the treated sintered NdFeB magnet into an electrophoresis liquid for electrophoresis, and carrying out electrophoresis parameters: 28 ℃,60V,45s;
(4) High temperature curing
And washing the magnet after electrophoresis with deionized water, drying with cold air, and then curing at high temperature. Curing parameters: preserving heat at 90 ℃ for 40min, preserving heat at 180 ℃ for 30min, and heating at a rate of 5-8 ℃/min.
After soaking in 3.5wt% NaCl solution for 36 days, the sintered NdFeB magnet with the surface electrophoresis polythiophene-carbon nano tube modified organic coating obtained according to the embodiment 1 has low-frequency impedance (|Z|0.01 Hz) of 4.76X106 Ω & cm2 after electrochemical impedance spectroscopy test, and the comparative sample is raised by two orders of magnitude; after soaking for 40 days, the corrosion potential is-0.357V, and the self-corrosion current density is 9.404 multiplied by 10 -9 A·cm -2 Compared with the comparative sample, the temperature is reduced by three orders of magnitude.
Example 2:
as shown in fig. 3, 5 and 6
The preparation method of this example is the same as that of example 1, except that the dispersion concentration of the polythiophene-carbon nanotube complex in step (3) is 6g/L.
After being soaked in 3.5wt% NaCl solution for 36 days, the sintered NdFeB magnet with the surface electrophoresis polythiophene-carbon nano tube modified organic coating obtained according to the steps is subjected to electrochemical impedance spectrum test, and the sintered NdFeB magnet is lowThe frequency impedance (|Z|0.01 Hz) is 4.41×10 7 Ω·cm 2 The comparative sample was raised by three orders of magnitude; after soaking for 40 days, the corrosion potential is-0.146V, and the self-corrosion current density is 9.648 multiplied by 10 -10 A·cm -2 The comparison sample is reduced by four orders of magnitude.
Example 3:
as shown in fig. 4-6
The preparation method of this example is the same as that of example 1, except that the dispersion concentration of the polythiophene-carbon nanotube complex in step (3) is 8g/L.
After soaking in 3.5wt% NaCl solution for 36 days, the sintered NdFeB magnet with the surface electrophoresis polythiophene-carbon nano tube modified organic coating obtained according to the steps is subjected to electrochemical impedance spectrum test, and the low-frequency impedance (|Z|0.01 Hz) of the sintered NdFeB magnet is 1.45x10 7 Ω·cm 2 The comparative sample was raised by three orders of magnitude; after soaking for 40 days, the corrosion potential is-0.031V and the self-corrosion current density is 3.290 multiplied by 10 by the test of polarization curve -9 A·cm -2 Compared with the comparative sample, the temperature is reduced by three orders of magnitude.
Example 4
As shown in fig. 7-8, a preparation device of a preparation method of a modified organic anti-corrosion coating comprises an electrophoresis tank 1, wherein a cover plate 2 is fixedly connected in the electrophoresis tank 1, an inlet 11 and an outlet 12 are respectively arranged at two ends of the cover plate 2, a guide plate 13 is arranged below the inlet 11, a discharge mechanism 3 is arranged in the outlet 12, the side surface of the outlet 12 is connected with a guide plate 4, a plurality of conveying rollers 5 which are linearly arrayed along the length direction of the electrophoresis tank 1 are rotatably connected between the lower part of the cover plate 2 and the electrophoresis tank 1, a plurality of groups of conveying rods 6 which are annularly arrayed are rotatably connected on the conveying rollers 5, each group of conveying rods 6 comprises a plurality of conveying rods 6 which are linearly arrayed along the axial direction of the conveying rollers 5, the axial line of the conveying rods 6 is collinear with the diameter of the conveying rollers 5, one end of the conveying rollers 5 is connected with a driving structure, the discharge mechanism 3 comprises two groups of vertically distributed discharge wheels 31, the two groups of discharge wheels 31 are connected through a driving belt 32, a shaft lever is fixedly connected to the outer side of the driving belt 32, the shaft lever is rotatably connected to the top end of the discharge frame 33, and the side surface of the discharge frame 33 is fixedly connected to a limit rod 331 which is abutted against the driving belt 32.
The magnet to be coated enters the electrophoresis tank 1 from the inlet 11, the tank liquor in the electrophoresis tank 1 is kept at a certain temperature under the action of a temperature control device connected with the electrophoresis tank 1, the electrophoresis tank 1 with the cover plate 2 can reduce the rate of heat exchange between the tank liquor and the external environment, thereby reducing the rate of temperature change of the tank liquor, keeping the tank liquor in a certain temperature range, the magnet to be coated falls onto the guide plate 13 from the inlet 11, slides onto the conveying rod 6 connected with the side surface of the leftmost conveying roller 5 along the inclined guide plate 13, drives the magnet to be coated to rotate under the condition that the conveying roller 5 rotates until the magnet to be coated slides onto the conveying rod 6 connected with the adjacent conveying roller 5 from the conveying rod 6, so that the magnet to be coated can continuously move along a wavy line path in the electrophoresis tank 1 with limited length, the continuously fed magnets to be coated are uniformly distributed, the moving distance of the magnets to be coated in the electrophoresis tank 1 is prolonged to ensure enough coating time, the coated magnets fall into a discharge frame of the discharge mechanism 3 through a right-most conveying roller 5, the discharge wheel 31 rotates to drive a transmission belt 32 to rotate, the discharged frame is overturned at the top of the discharge wheel 31 to pour out the magnets carried in the discharged frame, the poured magnets fall onto a guide plate 4 and are discharged along the guide plate 4 to enter the next procedure, the discharge frame rotates to the opening side to be positioned between the two groups of discharge wheels 31, a limiting rod 331 is abutted to the outer side of the transmission belt 32, the discharge mechanism 3 can be accommodated under the condition of small opening width so as to reduce heat loss of bath liquid, and the conveying rod 6 is connected with a circuit through a sliding ring, so that the magnets on the conveying rod 6 are kept electrified.
Example 5
As shown in figures 7-11, the preparation device of the preparation method of the modified organic anti-corrosion coating comprises an electrophoresis tank 1, a cover plate 2 is fixedly connected in the electrophoresis tank 1, an inlet 11 and an outlet 12 are respectively arranged at two ends of the cover plate 2, a guide plate 13 is arranged below the inlet 11, a discharge mechanism 3 is arranged in the outlet 12, the side surface of the outlet 12 is connected with a guide plate 4, a plurality of conveying rollers 5 which are linearly arrayed along the length direction of the electrophoresis tank 1 are rotationally connected between the lower part of the cover plate 2 and the electrophoresis tank 1, a plurality of groups of conveying rods 6 which are annularly arrayed are rotationally connected on the conveying rollers 5, each group of conveying rods 6 comprises a plurality of conveying rods 6 which are linearly arrayed along the axial direction of the conveying rollers 5, the axial line of the conveying rods 6 is collinear with the diameter of the conveying rollers 5, one end of the conveying rollers 5 is connected with a driving structure, the discharging mechanism 3 comprises two groups of vertically distributed discharging wheels 31, the two groups of discharging wheels 31 are connected through a transmission belt 32, a shaft lever is fixedly connected to the outer side of the transmission belt 32 and is rotationally connected with the top end of a discharging frame 33, the side surface of the discharging frame 33 is fixedly connected with a limiting rod 331 which is in contact with the transmission belt 32, the outer side of the connecting part of a conveying rod 6 and a conveying roller 5 is fixedly connected with a friction wheel 7, the conveying rod 6 is connected to a connecting hole 51 on the side surface of the conveying roller 5, the friction wheel 7 is intermittently contacted with the side surface of a friction ring 8 fixed in the electrophoresis tank 1, the friction ring 8 is coaxially rotationally connected with the conveying roller 5, gaps are respectively arranged on two sides of the friction ring 8 at intervals in a staggered manner, the conveying rod 6 is rotationally connected with the conveying roller 5, and the gaps of the adjacent friction rings 8 are staggered.
In the rotation process of the conveying roller 5, the conveying rod 6 rotates when contacting with the friction ring 8 on one side of the conveying rod 6, so that the conveying rod 6 rotates by taking the axis as the center, the magnet on the conveying rod moves along the axis direction of the conveying roller 5, the conveying rod 6 is separated from the friction ring 8 on the side when contacting with the friction ring 8 on the other side of the conveying rod 6, the conveying rod 6 rotates reversely, so that the magnet on the conveying rod moves reversely along the axis direction of the conveying roller 5, namely, the magnet moves along the wave line along the length direction of the electrophoresis tank 1 in the electrophoresis tank 1 and reciprocates along the width direction of the electrophoresis tank 1, and the magnet contacts with each part of tank liquid in the electrophoresis tank 1 to improve the coating uniformity, and the condition that the contact part of the magnet and the conveying rod 6 cannot be coated to cause uneven coating is avoided.
Example 6
As shown in figures 7-12, a preparation device of a preparation method of a modified organic anti-corrosion coating comprises an electrophoresis tank 1, wherein a cover plate 2 is fixedly connected in the electrophoresis tank 1, an inlet 11 and an outlet 12 are respectively arranged at two ends of the cover plate 2, a guide plate 13 is arranged below the inlet 11, a discharge mechanism 3 is arranged in the outlet 12, the side surface of the outlet 12 is connected with a guide plate 4, a plurality of conveying rollers 5 which are linearly arrayed along the length direction of the electrophoresis tank 1 are rotatably connected between the lower part of the cover plate 2 and the electrophoresis tank 1, a plurality of groups of conveying rods 6 which are annularly arrayed are rotatably connected on the conveying rollers 5, each group of conveying rods 6 comprises a plurality of conveying rods 6 which are linearly arrayed along the axial direction of the conveying rollers 5, the axial line of the conveying rods 6 is collinear with the diameter of the conveying rollers 5, one end of the conveying rollers 5 is connected with a driving structure, the discharge mechanism 3 comprises two groups of vertically distributed discharge wheels 31, the two groups of discharge wheels 31 are connected through a driving belt 32, the outside of the transmission belt 32 is fixedly connected with a shaft lever, the shaft lever is rotationally connected with the top end of the discharge frame 33, the side surface of the discharge frame 33 is fixedly connected with a limiting rod 331 which is abutted against the transmission belt 32, the outside of the joint of the conveying rod 6 and the conveying roller 5 is fixedly connected with a friction wheel 7, the friction wheel 7 is intermittently contacted with the side surface of a friction ring 8 fixed in the electrophoresis tank 1, the friction ring 8 is coaxially rotationally connected with the conveying roller 5, two sides of the friction ring 8 are respectively provided with notches at intervals in a staggered way, the conveying rod 6 is rotationally connected with the conveying roller 5, the notches of the adjacent friction rings 8 are staggered, a through hole 71 with a T-shaped section is arranged in the friction wheel 7, one end of the through hole 71 is communicated with the hollow part of the conveying rod 6, the inner end of the conveying rod 6 is communicated with the hollow part of the conveying roller 5, the end part of the conveying roller 5 is communicated with a liquid storage cavity, one end of the sliding rod 72 which is positioned in the through hole 71 and one end of the sliding rod 72 penetrates the side surface of the friction wheel 7, the inner end of the sliding rod 72 is fixedly connected with a first pressing plate 74, the slide bar 72 is axially and slidably connected with the second pressing plate 73, the outer end of the second pressing plate 73 is connected with the end part of the through hole 71 through a compression spring 75, the outer end of the slide bar 72 is fixedly connected with an arc plate 76 made of spring steel, and the arc plate 76 is spliced with a limit groove 77 arranged on the side face of the friction wheel 7.
When the friction wheel 7 rotates and is in contact with the friction ring 8, the end part of the arc plate 76 made of spring steel is elastically deformed to be inserted into the limit groove 77, the sliding rod 72 slides inwards along the axial direction until the first pressing plate 74 is positioned in the cavity in the friction wheel 7, so that the replenishment liquid enters between the first pressing plate 74 and the second pressing plate 73, meanwhile, the second pressing plate 73 slides to the right side under the elastic force of the compression spring 75 to seal the through hole 71 at the end part of the friction wheel 7, the groove liquid is prevented from entering the friction wheel 7, when the arc plate 76 is separated from the friction ring 8, the arc plate 76 gradually recovers to deform, so that the sliding rod 72 slides outwards, the first pressing plate 74 and the second pressing plate 73 slide leftwards under the action of pressure, a fixed amount of replenishment liquid between the first pressing plate 74 and the second pressing plate 73 is discharged from the through hole 71 at the end part of the friction wheel 7, and the replenishment liquid is rapidly and uniformly distributed in the electrophoresis tank 1 along with the rotation of the conveying rod 6, and the paint consumed in the groove liquid is replenished.
Claims (7)
1. A preparation method of a modified organic anti-corrosion coating is characterized by comprising the following steps: comprises the following steps of
S1, preparing a polythiophene-carbon nano tube compound: uniformly mixing a 3, 4-ethylenedioxythiophene monomer, poly (4-sodium styrene sulfonate), carboxylated carbon nanotubes and deionized water, adding sodium persulfate into the system to react for a certain time at a certain temperature, and centrifuging, washing and drying to obtain a polythiophene-carbon nanotube compound;
s2, pretreatment of the surface of the magnet: acid washing and rust removing are carried out on the sintered NdFeB magnet, and the sintered NdFeB magnet is dried after ultrasonic cleaning;
s3, dispersing the polythiophene-carbon nano tube composite into an electrophoresis liquid, immersing the sintered NdFeB magnet subjected to surface treatment into the electrophoresis liquid for electrophoretic coating, wherein the dispersion concentration of the polythiophene-carbon nano tube composite is 1-12g/L, the electrophoresis liquid is any one or more of epoxy resin, polyurethane and acrylic resin, the electrophoresis voltage is 60-100V, the electrophoresis duration is 45-60s, and the temperature of the bath liquid is 25-30 ℃;
s4, high-temperature curing, namely washing the magnet subjected to electrophoresis by deionized water, air-drying, and then performing high-temperature curing, and finally preparing a polythiophene-carbon nano tube modified organic anti-corrosion coating on the surface of the magnet;
the organic anti-corrosion coating preparation device for the electrophoretic coating comprises an electrophoresis tank, a cover plate is fixedly connected in the electrophoresis tank, an inlet and an outlet are respectively arranged at two ends of the cover plate, a guide plate is arranged below the inlet, a discharge mechanism is arranged in the outlet, the side face of the outlet is connected with a guide plate, a plurality of conveying rollers which are linearly arrayed along the length direction of the electrophoresis tank are rotationally connected between the lower side of the cover plate and the electrophoresis tank, a plurality of groups of conveying rods which are annularly arrayed are rotationally connected on the conveying rollers, each group of conveying rods comprises a plurality of conveying rods which are linearly arrayed along the axis direction of the conveying rollers, the axis of each conveying rod is collinear with the diameter of the conveying roller, one end of each conveying roller is connected with a driving structure, the discharge mechanism comprises two groups of vertically distributed discharge wheels, the two groups of discharge wheels are connected through a driving belt, a shaft lever is fixedly connected to the outer side of the driving belt, the shaft lever is rotationally connected with the top end of a discharge frame, and the side face of the discharge frame is fixedly connected with a limiting rod which is abutted against the driving belt;
when in electrophoretic coating, a magnet to be coated enters an electrophoresis tank from an inlet, the tank liquor in the electrophoresis tank is kept at a certain temperature under the action of a temperature control device connected with the electrophoresis tank, the electrophoresis tank with a cover plate can reduce the rate of heat exchange between the tank liquor and the external environment, thereby reducing the rate of temperature change of the tank liquor, keeping the tank liquor in a certain temperature range, the magnet to be coated falls onto a guide plate from the inlet, slides onto a conveying rod connected with the side surface of a leftmost conveying roller along the inclined guide plate, the conveying roller drives the magnet to be coated to rotate under the condition of rotating, slides onto the conveying rod connected with the adjacent conveying roller from the conveying rod, so that the magnet to be coated can continuously move along a wavy line path, and in the electrophoresis tank with limited length, the method is characterized in that continuously fed magnets to be coated are uniformly distributed, the moving distance of the magnets to be coated in an electrophoresis tank is prolonged to ensure enough coating time, coated magnets fall into a discharge frame of a discharge mechanism from a conveying roller at the rightmost end, a discharge wheel rotates to drive a driving belt to rotate until the discharge frame overturns at the top of the discharge wheel to pour out the magnets carried in the magnets, the poured magnets fall onto a guide plate and enter the next procedure along the guide plate, the discharge frame rotates to the opening side to be positioned between two groups of discharge wheels, a limiting rod is abutted to the outer side of the driving belt, a discharge mechanism can be contained under the condition of small opening width so as to reduce heat loss of tank liquor, and the conveying rod is connected with a circuit through a sliding ring, so that the magnets on the conveying rod are kept electrified.
2. The method for preparing the modified organic anti-corrosion coating according to claim 1, wherein the method comprises the following steps: in the S1, the mass ratio of the carboxylated carbon nano tube to the thiophene monomer is 1:1-1:10, the carbon nano tube is single-wall or multi-wall carbon nano tube, the reaction temperature is 25-30 ℃, and the reaction time is 12-24h.
3. The method for preparing the modified organic anti-corrosion coating according to claim 1, wherein the method comprises the following steps: the acid used in the step S2 is 3-5Vol% nitric acid, and the pickling time is 20-50S.
4. The method for preparing the modified organic anti-corrosion coating according to claim 1, wherein the method comprises the following steps: and in the step S4, the program temperature in the curing process is 90-180 ℃ and the program time is 80-120min.
5. The method for preparing the modified organic anti-corrosion coating according to claim 1, which is characterized in that: the conveying rod is rotationally connected to the conveying roller, the friction wheel is fixedly connected to the conveying rod, the friction wheel is in intermittent fit contact with the friction ring, and the friction ring is fixed in the electrophoresis tank.
6. The method for preparing a modified organic anti-corrosive coating according to claim 5, wherein the method comprises the following steps: the conveying roller and the conveying rod are hollow, one end of the conveying roller is communicated with a liquid storage cavity in the supplementing mechanism, the inner end of the conveying rod is communicated with the conveying roller, the inner side of the friction wheel is connected with a slide way, the side surface of the slide way is respectively provided with a through hole for communicating the inner part of the conveying rod and the end surface of the friction wheel, a slide rod extending to the outer side of the friction wheel through the end part of the slide way is arranged in the slide way, the slide rod is fixedly connected with a first pressing plate, the slide rod is axially and slidably connected with a second pressing plate, and the outer end of the second pressing plate is in contact with a compression spring.
7. The method for preparing a modified organic anti-corrosive coating according to claim 6, wherein: the outer end of the pressing plate is fixedly connected with an arc plate made of spring steel, two ends of the arc plate are arranged in limiting grooves in the friction wheel, and the arc plate is spliced with the limiting grooves arranged on the side face of the friction wheel.
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