Coatings for the liquid-contact surface of cathode plates, their preparation methods, application methods, and uses.

Abstract

This invention belongs to the field of heavy non-ferrous metal electrolysis technology, specifically relating to a coating for the liquid-contact surface of a cathode plate, its preparation method, application method, and application. The coating comprises the following components: 85-95% polyester resin, 5-15% epoxy resin, and 15-20% by weight of the polyester resin and epoxy resin, 15-20% ultrafine quartz powder, 3-5% suspending agent, 0.01-0.03% colorant, 1-3% dispersant, and 0.05-0.15% defoamer. This invention is primarily used for coating the liquid-contact surface of zinc and copper cathode plates in heavy non-ferrous metal electrolysis, solving the problem of electrolyte deposition on the liquid-contact surface.

Description

Technical Field

[0001] This invention belongs to the field of heavy non-ferrous metal electrolysis technology, specifically relating to a coating for the liquid-contact surface of a cathode plate, its preparation method, usage method, and application. Background Technology

[0002] For a long time, there has been no effective solution to the problem of electrolyte deposits on the liquid-contaminated surface of the cathode plate hindering the peeling of the electrolytic plates in the electrolysis of heavy non-ferrous metals such as zinc and copper. When electrolyte splashes onto the liquid-contaminated surface of the cathode plate, electrolyte deposits are formed, and these deposits accumulate and thicken over time. Unlike the deposits on the electrolytic plates themselves, the liquid-contaminated deposits adhere very firmly to the liquid-contaminated surface. Peeling the electrolytic plates requires using a sharp tool to create a starting point before peeling can proceed. This shoveling and chiseling process is extremely labor-intensive and also reduces the lifespan of the cathode plate.

[0003] Current solutions include: 1) applying epoxy resin as an isolation layer to the liquid-contaminated surface; however, the epoxy resin has a different shrinkage ratio than the metal cathode plate, causing the coating to peel off after a period of time and contaminating the electrolyte. 2) applying fiberglass to the liquid-contaminated surface; however, the fiberglass also suffers from peeling due to its different shrinkage ratio compared to the metal cathode plate, leading to even more severe contamination. 3) creating a circular hole with a diameter of approximately 70mm at the junction of the cathode plate's liquid-contaminated surface and the electrolyte in the tank, serving as the starting point for the lower cutting tool when peeling off the electrolyte sheet; however, this could potentially cause the cathode plate to break. Therefore, a new method is urgently needed to solve the problem of electrolyte deposition on the liquid-contaminated surface. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention provides a coating for the liquid-contact surface of a cathode plate, along with its preparation method, application method, and general application.

[0005] The present invention is achieved by first providing a coating for the liquid-contact surface of a cathode plate, comprising the following components: 85-95% polyester resin, 5-15% epoxy resin, and 15-20% by weight of polyester resin and epoxy resin, 15-20% ultrafine quartz powder, 3-5% suspending agent, 0.01-0.03% colorant, 1-3% dispersant, and 0.05-0.15% defoamer.

[0006] Preferably, the active diluent is a divalent ester, the suspending agent is XG600, the colorant is chromium oxide green, the dispersant is STA1210, and the defoamer is BYK defoamer.

[0007] The present invention also provides a method for preparing a coating for the liquid-contact surface of a cathode plate, which, based on the above-mentioned coating for the liquid-contact surface of a cathode plate, includes the following steps:

[0008] 1) Take polyester resin and epoxy resin in proportion, mix them, place them on a disperser, and disperse them under certain conditions for a certain time to form a mixed resin;

[0009] 2) Add reactive diluent, ultrafine quartz powder, suspending agent, colorant, dispersant, leveling agent and defoamer to the mixed resin in proportion, and then rotate and disperse under certain conditions for a certain time to mix evenly;

[0010] 3) Place the well-mixed material on a grinder and grind it 1-2 times to obtain a coating for the liquid-contact surface of the cathode plate.

[0011] Preferably, in steps 1) and 2), the dispersion conditions are 800 r / min and 20 min.

[0012] The present invention also provides a method for using a coating for the liquid-contact surface of a cathode plate, the method comprising the following steps:

[0013] 1) Take the cathode plate and sand the area where the coating is applied to create a rough surface;

[0014] 2) Take the coating material for the liquid-contact surface of the cathode plate, add liquid curing agent to the coating material, and mix thoroughly.

[0015] 3) First coating: Apply a thin layer of paint with added hardener to the sanded rough surface, apply evenly, and wait for a certain period of time;

[0016] 4) Second coating: When the first coating layer is no longer sticky to the touch, begin the second coating. The thickness of the two coatings should be 0.15-0.25mm. After complete curing, the coating process is complete.

[0017] Preferably, in step 2), the curing agent is a GMA type curing agent, and the amount added is 4-5% of the amount of coating.

[0018] Further preferred, in step 3), the waiting time after the first coating is 15-20 minutes; in step 4), the time for complete curing is 50-70 minutes.

[0019] The present invention also provides an application of a coating for the liquid-contact surface of a cathode plate, for coating the liquid-contact surface of a heavy non-ferrous metal electrolytic zinc cathode plate and an electrolytic copper cathode plate.

[0020] Compared with the prior art, the advantages of the present invention are as follows:

[0021] This invention provides a coating for the liquid-contact surface of a cathode plate, along with its preparation, application, and general characteristics. It is primarily used for coating the liquid-contact surfaces of zinc and copper cathode plates used in heavy non-ferrous metal electrolysis, solving the problem of electrolyte deposition on the liquid-contact surface. This coating adheres firmly to the metal cathode plate, preventing delamination and peeling. Its shrinkage ratio is similar to that of the metal cathode plate, allowing it to shrink with the plate. It is durable for long-term use, resistant to electrolyte temperature and acidity, abrasion-resistant, easy to apply, and cures quickly. For manual peeling of electrolytic plates, it offers high peeling efficiency and saves labor; for mechanical peeling, it saves peeling power, protects the plates, and extends their service life. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the cathode plate at the liquid surface. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0024] This invention provides a method for the liquid-contact surface of a cathode plate ( Figure 1 The coating (in the shaded areas) is mainly composed of polyester resin and epoxy resin, and also includes reactive diluent, ultrafine quartz powder, suspending agent, colorant, dispersant and defoamer.

[0025] The active diluent reduces the viscosity of the mixed resin and decreases the bonding between resin particles. Ultrafine quartz powder supplements the thinner added to the resin, contributing to the film thickness during application and increasing insulation. A suspending agent prevents quartz powder sedimentation. A colorant is used for color matching in composite resin coatings, ensuring a clear distinction between the coating on the liquid-contact surface and other parts of the cathode plate. A dispersant prevents the colorant from floating or causing uneven coloring in the composite resin. An antifoaming agent rapidly reduces surface tension during application, causing air bubbles to quickly burst and disappear.

[0026] The preparation method of the present invention incorporates a grinding process, which can break down the resin particles and combine them with various additives and inorganic aggregates to form new particles.

[0027] Example 1

[0028] For zinc electrolysis: This embodiment provides a coating for the liquid-contact surface of a zinc electrolysis cathode plate, comprising the following components: 90% polyester resin, 10% epoxy resin, and 20% by mass of polyester resin and epoxy resin, 20% ultrafine quartz powder, 4% suspending agent, 0.02% colorant, 2% dispersant, and 0.1% defoamer.

[0029] Preparation methods include:

[0030] 1) Take polyester resin and epoxy resin in proportion, mix them, place them on a disperser, and disperse them at 800 r / min for 20 min to form a mixed resin;

[0031] 2) Add reactive diluent, ultrafine quartz powder, suspending agent, colorant, dispersant and defoamer to the mixed resin in proportion, and then rotate and disperse at 800 r / min for 20 min to mix evenly;

[0032] 3) Place the well-mixed material on a grinder and grind it 1-2 times to obtain a coating for the liquid-contact surface of the cathode plate.

[0033] When using it, the following steps are included:

[0034] 1) Take a zinc electrolytic cathode plate and sand the area where the coating is to be applied to create a rough surface;

[0035] 2) Take the coating material for the liquid-contact surface of the cathode plate, add 4-5% of the coating material amount of curing agent to the coating material, and mix thoroughly and evenly;

[0036] 3) First coating: Apply a thin layer of paint with added hardener to the sanded rough surface, apply evenly, and wait 15-20 minutes;

[0037] 4) Second coating: When the first coating layer is no longer sticky to the touch, begin the second coating. The thickness of the two coatings should be 0.15-0.25mm. After 50-70 minutes, the coating will be completely cured and the coating process will be complete.

[0038] Testing: The coated cathode plate was placed in a mixture of sulfuric acid 320g / L and 45 degrees Celsius under the same conditions as zinc electrolysis (zinc electrolysis is a 24-hour cycle). After seven days of testing, no cracking or peeling of the coating on the liquid surface was observed.

[0039] Example 2

[0040] For copper electrolysis: This embodiment provides a coating for the liquid-contact surface of a copper electrolysis cathode plate, comprising the following components: 85% polyester resin, 15% epoxy resin, and 20% by mass of polyester resin and epoxy resin, 20% ultrafine quartz powder, 4% suspending agent, 0.02% colorant, 2% dispersant, and 0.1% defoamer.

[0041] Preparation methods include:

[0042] 1) Take polyester resin and epoxy resin in proportion, mix them, place them on a disperser, and disperse them at 800 r / min for 20 min to form a mixed resin;

[0043] 2) Add reactive diluent, ultrafine quartz powder, suspending agent, colorant, dispersant, leveling agent and defoamer to the mixed resin in proportion, and then rotate and disperse at 800 r / min for 20 min to mix evenly;

[0044] 3) Place the well-mixed material on a grinder and grind it 1-2 times to obtain a coating for the liquid-contact surface of the cathode plate.

[0045] When using it, the following steps are included:

[0046] 1) Take a copper electrolytic cathode plate and sand the area where the coating is to be applied to create a rough surface;

[0047] 2) Take the coating material for the liquid-contact surface of the cathode plate, add 4-5% of the coating material amount of curing agent to the coating material, and mix thoroughly and evenly;

[0048] 3) First coating: Apply a thin layer of paint with added hardener to the sanded rough surface, apply evenly, and wait 15-20 minutes;

[0049] 4) Second coating: When the first coating layer is no longer sticky to the touch, begin the second coating. The thickness of the two coatings should be 0.15-0.25mm. After 50-70 minutes, the coating will be completely cured and the coating process will be complete.

[0050] Testing: The coated cathode plate was placed in a solution containing 200 g / L sulfuric acid at a temperature of 68 degrees Celsius under the same conditions as copper electrolysis (copper electrolysis is a seven-day cycle). In actual tests lasting more than 15 days, no cracking or peeling of the coating layer on the liquid surface was observed.

Claims

1. A method of use of a coating for the cathode plate liquid-junction, characterized in that, The coating comprises the following components: polyester resin 85-95%, epoxy resin 5-15%, and 15-20% of bivalent acid ester, 15-20% of superfine quartz powder, 3-5% of suspending agent, 0.01-0.03% of toning agent, 1-3% of dispersing agent, and 0.05-0.15% of defoaming agent, accounting for 15-20% of the mass of the polyester resin and the epoxy resin; The use method comprises the following steps: 1) taking a cathode plate, polishing the position to be coated with the coating to form a rough surface by using sandpaper; 2) taking the coating for the liquid surface of the cathode plate, adding a liquid curing agent to the coating, and mixing thoroughly; 3) first coating: coating a thin layer of the coating with the curing agent on the polished rough surface, uniformly coating, and waiting for a certain period of time; 4) second coating: when the first coating layer is not sticky, the second coating is started, the thickness of the two coatings is 0.15-0.25 mm, and the coating is completed after complete curing; The toning agent is chromium oxide green, and the dispersing agent is sta1210; In step 2) of the use method, the curing agent is a gma type curing agent, and the amount added is 4-5% of the amount of the coating; In step 3) of the use method, the waiting time after the first coating is 15-20 min, and in step 4), the complete curing time is 50-70 min.

2. The method of using a coating for the cathode plate's liquid level according to claim 1, characterized in that, The preparation method of the coating comprises the following steps: 1) taking the polyester resin and the epoxy resin in proportion, mixing, placing on a dispersing machine, rotating and dispersing under certain conditions for a certain period of time to form a mixed resin; 2) adding the bivalent acid ester, the superfine quartz powder, the suspending agent, the toning agent, the dispersing agent, and the defoaming agent to the mixed resin in proportion, rotating and dispersing under certain conditions for a certain period of time to mix uniformly; 3) placing the mixed material on a grinding machine, grinding 1-2 times to obtain the coating for the liquid surface of the cathode plate.

3. The method of using a coating for the cathode plate wetted surface according to claim 2, wherein, In steps 1) and 2) of the preparation method, the dispersion conditions are 800 r / min and 20 min.

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