Efficient antibacterial mildew-proof waterborne epoxy insulating paint and preparation method thereof

Abstract

The invention discloses an efficient antibacterial mildew-proof waterborne epoxy insulating paint which is prepared from the following raw materials in percentage by weight: 48%-50% of waterborne epoxy insulating paint, 0.15%-0.18% of insulating paint rare earth antibacterial agent, 0.15%-0.18% of methylisothiazolinone, 0.08%-0.1% of dispersing agent, 0.02%-0.03% of defoaming agent and 50%-55% of deionized water. According to the invention, the rare earth antibacterial agent and methylisothiazolinone are compounded and ground to the fineness of 5 [mu] m, and then the mixture is added into the waterborne epoxy insulation material, so that the problems of seepage of the two antibacterial agents and synergistic antibacterial and mildew-proof effects are solved; and through a two-step dipping construction process, the influence of the antibacterial and mildew-proof agent on the insulating property is solved, the efficient antibacterial function and the high insulating property coexist, the requirements of insulating paint for copper wire water pump motors, especially ship water pump motors, are met, and the insulating paint can also be applied to insulating, antibacterial and mildew-proof protection of metal wires such as aluminum wires and iron wires, and has a wide application prospect. The long-term, excellent, efficient, safe, environment-friendly, antibacterial and mildew-proof properties are provided.

Description

Technical Field

[0001] The invention relates to the technical field of insulating coatings, in particular to a highly effective antibacterial and mildew-proof water-based epoxy insulating varnish and a preparation method thereof. Background Art

[0002] Insulating varnish is a coating with electrochemical, thermal, mechanical and chemical properties after curing. It provides insulation protection for copper wires and iron substrates, avoiding accidents such as leakage, spontaneous combustion, and shutdown during production and life, and avoiding unnecessary losses of personnel and equipment. Water-based epoxy resin insulating varnish uses water as solvent and does not contain volatile organic solvents. After curing, it has excellent mechanical strength, chemical resistance, electrical properties, moisture resistance, low shrinkage, high cost performance and other excellent properties, with dual advantages of performance and environmental protection.

[0003] At present, a Chinese invention with a publication number of (CN105505125A) discloses a weather-resistant impregnated insulating varnish for power transformers, which uses vinyl trichlorosilane, methyl vinyl dichlorosilane, methyl etherified amino resin, epoxy resin, diisopropylbenzene peroxide and organic solvent, curing agent, film-forming agent, filler, chrome iron black and cosolvent. The weather-resistant insulating varnish for power transformers of the invention not only has good weather resistance and high strength, but also has the properties of wear resistance, heat conduction, non-toxic and environmental protection, and antibacterial function;

[0004] A Chinese invention with publication number (CN110183950A) discloses a water-based polyurethane insulating varnish with anti-mildew effect and used in the electrical industry. The anti-mildew agent used is EPW432 water-based anti-mildew agent, the main components of which are imidazole derivatives and aromatic urea derivatives. The water-based polyurethane insulating varnish of the invention has excellent surface state, resistance to moisture and heat, resistance to salt spray, resistance to heat, resistance to acid, resistance to alkali and resistance to mildew.

[0005] Although both types of insulating paints mentioned above have certain antibacterial functions, they also have shortcomings. For example, in dark environments on ships or on land, the epoxy resin surface of organic polymer materials is prone to the growth of bacteria and mold. In addition, the mold mycelium contains a large amount of water, which will increase the conductivity of the coated surface of electrical components, reduce the insulation performance, and lead to a decrease in the electrical performance of the insulation layer. In addition, the enzymes produced by mold will cleave the fat bonds in the paint, causing the paint layer to peel off, greatly shortening the service life of the motor.

[0006] Therefore, a highly effective antibacterial and mildew-proof water-based epoxy insulating paint and a preparation method thereof are proposed to solve this problem. Summary of the invention

[0007] The purpose of the present invention is to provide a highly effective antibacterial and mildew-proof water-based epoxy insulating paint and a preparation method thereof, wherein rare earth antibacterial agent and methylisothiazolinone are used as antibacterial and mildew-proof agents, and the functions of the two are synergistically exerted through a special preparation process and construction process, thereby giving the modified insulating paint highly effective antibacterial and mildew-proof properties. The problem that bacteria and mildew are easily grown on the surface of the insulating paint, resulting in the paint layer peeling off, is solved.

[0008] To achieve the above object, the present invention provides the following technical solution: a highly efficient antibacterial and mildew-proof water-based epoxy insulating varnish, the raw material ratio is as follows:

[0009] Water-based epoxy insulating varnish 48%~50%, insulating varnish rare earth antibacterial agent 0.15%~0.18%, methylisothiazolinone 0.15%~0.18%, dispersant 0.08%~0.1%, defoaming agent 0.02%~0.03%, deionized water 50%~55%.

[0010] Preferably, the water-based epoxy insulating paint is FS7100 water-based epoxy resin insulating paint.

[0011] Preferably, the deionized water is prepared by a water purifier through filtration, reverse osmosis, and ion exchange.

[0012] Preferably, the dispersant may be any one of UNIQ SPERSE 630U, UNIQ SPERSE 650U, and UNIQ SPERSE 680U, and the defoaming agent may be any one of UNIQ FOAM 265W and UNIQ FOAM 280W.

[0013] Preferably, the rare earth antibacterial agent can be any one of cerium pyrithione, lanthanum pyrithione, europium pyrithione and samarium pyrithione. The rare earth antibacterial agent is a white or dark green powder with a heat-resistant temperature of more than 220°C.

[0014] A method for preparing a highly effective antibacterial and mildew-proof water-based epoxy insulating varnish comprises the following steps:

[0015] Step 1: Preparation of antibacterial and antifungal agent solution: Add 3000-4000g of deionized water into a 6L plastic jar, add 5g of dispersant, and disperse at a high speed of 1500r / min for 2min. Then, add 500g of pyridinethione rare earth and 500g of methylisothiazolinone into the above aqueous solution to prepare a liquid with a mass concentration of 20%-25%, and disperse at a high speed of 2000r / min for 5min. Then grind into powder particles and filter the material to obtain the antibacterial and antifungal agent solution;

[0016] Step 2: Preparation of antibacterial and mildew-proof water-based epoxy insulating paint stock solution: Add 300g of water-based epoxy insulating paint to a 1L four-necked flask, add 1.5g of defoaming agent at the same time, place it in water, install a thermometer, agitator and reflux condenser, set the stirring rate to 1000r / min, and start heating. When the temperature in the four-necked flask reaches 50°C, start dripping 300g of the antibacterial and mildew-proof agent solution in step 1 while stirring, and add the liquid within 30 minutes. Adjust the solution pH to a suitable value with ammonia water, and continue stirring for 30 minutes. After stirring, cool and discharge the material to obtain the antibacterial and mildew-proof water-based epoxy insulating paint stock solution;

[0017] Step 3: Preparation of antibacterial and mildew-proof water-based epoxy insulating paint: Mix the water-based epoxy insulating paint with the antibacterial and mildew-proof water-based epoxy insulating paint stock solution in step 2 at a mass ratio of 27:1. Then add deionized water, dilute by half, and stir to obtain the antibacterial and mildew-proof water-based epoxy insulating paint.

[0018] Preferably, in step 1, after the liquid is dispersed, it is moved to a sand mill with zirconium beads for grinding, and the particle size of the ground powder needs to be less than 5 um.

[0019] Preferably, in step 2, the pH value of the solution is adjusted by aqueous ammonia to a range of 9 to 10.

[0020] Preferably, in step 3, when the water-based insulating paint and the antibacterial and mildew-proof water-based epoxy insulating paint stock solution are mixed, the solution is continuously stirred at a low speed for more than 5 minutes during this process.

[0021] A construction process of a highly efficient antibacterial and mildew-proof water-based epoxy insulating paint comprises the following steps:

[0022] Step 1: During the copper wire varnishing process, first immerse the copper wire in a diluted water-based epoxy insulating varnish without antibacterial and mildew-proof agent for 1 minute, then take it out and dry it naturally for 3 minutes; then move it into the antibacterial and mildew-proof water-based epoxy insulating varnish and immerse it for 2 minutes. During this process, keep the solution continuously stirred at a low speed to avoid the sedimentation of powder particles; take it out, dry it naturally until no paint beads drip, and then put it in a high-temperature furnace for heating and drying. The heating temperature is 120-130°C and the insulation time is 120-180 minutes to obtain an insulating layer with antibacterial and mildew-proof functions.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] The pyridinethione rare earth antibacterial agent used in the present invention has an antibacterial effect with high efficiency, low toxicity and environmental protection. Methylisothiazolinone is an efficient broad-spectrum mildew and mildew-proof antibacterial agent. Both contain heterocyclic structures and have excellent compatibility. The powdered pyridinethione rare earth antibacterial agent can inhibit the methylisothiazolinone from seeping out in the insulating layer, and keep the insulating layer highly efficient and long-lasting antibacterial and mildew-proof. In addition, the pyridinethione rare earth antibacterial agent uses the rare earth elements in the structure to destroy the bacterial cell wall, causing it to lose its metabolic capacity. Methylisothiazolinone uses the S, N, O and other groups on the heterocyclic ring to form chemical bonds with the bases on the DNA of the protein in the bacteria, thereby destroying the structure of the DNA in the cell, causing it to lose its replication ability and leading to cell death. The synergistic effect of the two can achieve excellent antibacterial and mildew-proof functions at a relatively low addition amount. At the same time, the production process is simple, the construction is simple, and the application is wide. It can be used for the insulating paint of copper wires such as stators and rotors in motors, providing long-lasting, excellent, efficient, safe and environmentally friendly antibacterial and mildew-proof properties. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a SEM photo of Comparative Example 3 of the present invention; Figure 2 This is a SEM photo of Example 3 of the present invention; Figure 3 The antibacterial effect a (film sticking method) of comparative example 4 of the present invention is shown in FIG. Figure 4 This is a diagram of the antibacterial effect a (film sticking method) of Example 4 of the present invention; Figure 5 This is a diagram of the antibacterial effect b (film sticking method) of comparative example 5 of the present invention; Figure 6 This is a diagram of the antibacterial effect b (film sticking method) of Example 5 of the present invention. DETAILED DESCRIPTION

[0027] The present invention will be described in more detail below by way of examples, which are merely illustrative and do not in any way limit the scope of the present invention.

[0028] Embodiment 1:

[0029] In the first aspect of this embodiment, the present invention provides a technical solution: a highly efficient antibacterial and mildew-proof water-based epoxy insulating varnish, the raw material ratio is as follows:

[0030] Water-based epoxy insulating varnish 48%~50%, insulating varnish rare earth antibacterial agent 0.15%~0.18%, methylisothiazolinone 0.15%~0.18%, dispersant 0.08%~0.1%, defoaming agent 0.02%~0.03%, deionized water 50%~55%.

[0031] In the second aspect of this embodiment, the present invention provides a method for preparing an efficient antibacterial and mildew-proof water-based epoxy insulating paint, the method comprising: first, adding 3000-4000g of deionized water into a 6L plastic tank, adding 5g of dispersant at the same time, and dispersing at a high speed of 1500r / min for 2min. Add 500g of pyridinethione rare earth and 500g of methylisothiazolinone to the above aqueous solution, configure it into a liquid with a mass concentration of 20% to 25%, and disperse it at a high speed of 2000r / min for 5min. Then grind it into powder particles and filter the material. Then add 300g of water-based epoxy insulating paint into a 1L four-necked flask, add 1.5g of defoamer at the same time, place it in the water area, install a thermometer, a stirrer and a reflux condenser, set the stirring rate to 1000r / min, and start heating. When the temperature in the four-necked bottle reaches 50°C, start to drip 300g of antibacterial and mildew-proof agent solution while stirring. Add the liquid within 30 minutes, adjust the pH value of the solution to a suitable value with ammonia water, and continue stirring for 30 minutes. After stirring, cool and discharge. Finally, mix the water-based epoxy insulating paint with the antibacterial and mildew-proof water-based epoxy insulating paint stock solution in a mass ratio of 27:1. Then add deionized water, dilute it by half, and stir to obtain the antibacterial and mildew-proof water-based epoxy insulating paint.

[0032] In the third aspect of this embodiment, the present invention provides a construction process for a highly efficient antibacterial and mildew-proof water-based epoxy insulating paint, the process comprising: in the copper wire dipping process, first immerse the copper wire in a water-based epoxy insulating paint dilution solution that does not contain an antibacterial and mildew-proof agent for 1 minute, then take it out and dry it naturally for 3 minutes; then move the antibacterial and mildew-proof water-based epoxy insulating paint into it and immerse it for 2 minutes, during which the solution is continuously stirred at a low speed to avoid the sedimentation of powder particles; take it out, dry it naturally until no paint beads drip, and then put it into a high-temperature furnace for heating and drying, the heating temperature is 120-130°C, and the insulation time is 120-180 minutes, so as to obtain an insulating layer with antibacterial and mildew-proof functions.

[0033] Embodiment 2:

[0034] The above-mentioned highly effective antibacterial and mildew-proof water-based epoxy insulating paint of the present invention is tested in this embodiment mainly with reference to the following national standards. The test results are as follows, please refer to the following table:

[0035] The present invention also provides the following embodiments:

[0036] Embodiment 3:

[0037] The above-mentioned highly effective antibacterial and mildew-proof water-based epoxy insulating paint of the present invention, its preparation method and construction process:

[0038] 1. Preparation of antibacterial and antifungal agent solution:

[0039] 3000g of deionized water was added to a 6L plastic tank, and 5g of UNIQ SPERSE 650U dispersant was added at the same time, and the mixture was dispersed at a high speed of 1500r / min for 2min; then, 500g of cerium pyrithione and 500g of methylisothiazolinone were added to the aqueous solution to prepare a liquid with a mass concentration of 25%, and the mixture was dispersed at a high speed of 2000r / min for 5min, and then the mixture was moved to a sand mill with zirconium beads and ground until the powder particle size was 4um, and the material was filtered to obtain an antibacterial and antifungal agent solution.

[0040] 2. Preparation of antibacterial and anti-mildew water-based epoxy insulating paint stock solution:

[0041] 300g of water-based epoxy insulating paint was added into a 1L four-necked flask, and 1.5g of UNIQ FOAM 265W defoamer was added at the same time. The flask was placed in water, and a thermometer, a stirrer and a reflux condenser were installed. The stirring rate was set to 1000r / min, and heating was started. When the temperature in the four-necked flask reached 50°C, 300g of antibacterial and mildew-proof agent solution was added dropwise while stirring. The liquid was added dropwise within 30min, and the pH value of the solution was adjusted to 10 with ammonia water. The solution was stirred for 30min. After stirring, the solution was cooled and discharged to obtain the antibacterial and mildew-proof water-based epoxy insulating paint stock solution.

[0042] 3. Preparation of antibacterial and anti-mildew water-based epoxy insulating paint:

[0043] Before use, mix the water-based epoxy insulating paint and the antibacterial and mildew-proof water-based epoxy insulating paint stock solution in a mass ratio of 27:1; then, add deionized water, dilute it by half, and stir at a low speed for 5 minutes to obtain the antibacterial and mildew-proof water-based epoxy insulating paint.

[0044] 4. Construction process of antibacterial and anti-mildew water-based epoxy insulating paint:

[0045] During the copper wire varnishing process, the copper wire is first immersed in a diluted water-based epoxy insulating paint solution without antibacterial and mildew-proof agent for 1 minute; taken out and dried naturally for 3 minutes; then moved into the antibacterial and mildew-proof water-based epoxy insulating paint and immersed for 2 minutes. During this process, the solution is continuously stirred at a low speed to avoid the sedimentation of powder particles; taken out and dried naturally until no paint beads drip, and then placed in a high-temperature furnace for heating and drying. The heating temperature is 125°C and the insulation time is 180 minutes to obtain an insulating layer with antibacterial and mildew-proof functions.

[0046] Comparative Example 3:

[0047] The above-mentioned highly effective antibacterial and mildew-proof water-based epoxy insulating paint of the present invention, its preparation method and construction process:

[0048] 1. Preparation of antibacterial and antifungal agent solution:

[0049] Add 3500g of deionized water into a 6L plastic jar, and add 5g of UNIQ SPERSE 630U dispersant at the same time, and disperse at high speed at 1500r / min for 2min; then, add 500g of methylisothiazolinone into the above aqueous solution to prepare a liquid with a mass concentration of 12.5%, disperse at high speed at 2000r / min for 5min, and then move to a sand mill with zirconium bead abrasives for grinding until the powder particle size is 5um, and filter the material.

[0050] 2. Preparation of antibacterial and anti-mildew water-based epoxy insulating paint stock solution:

[0051] 300g of water-based epoxy insulating paint was added into a 1L four-necked flask, and 1.5g of UNIQ FOAM 280W defoamer was added at the same time. The flask was placed in water, and a thermometer, a stirrer and a reflux condenser were installed. The stirring rate was set to 1000r / min, and heating was started. When the temperature in the four-necked flask reached 50°C, 300g of antibacterial and mildew-proof agent solution was added dropwise while stirring. The liquid was added dropwise within 30min, and the pH value of the solution was adjusted to 9 with ammonia water. The solution was stirred for 30min. After stirring, the solution was cooled and discharged to obtain the antibacterial and mildew-proof water-based epoxy insulating paint stock solution.

[0052] 3. Preparation of antibacterial and anti-mildew water-based epoxy insulating paint:

[0053] Before use, mix the water-based epoxy insulating paint and the antibacterial and mildew-proof water-based epoxy insulating paint stock solution in a mass ratio of 27:1; then, add deionized water, dilute it by half, and stir at a low speed for 5 minutes to obtain the antibacterial and mildew-proof water-based epoxy insulating paint.

[0054] 4. Construction process of antibacterial and anti-mildew water-based epoxy insulating paint:

[0055] During the copper wire varnishing process, the copper wire is first immersed in a diluted water-based epoxy insulating varnish without antibacterial and mildew-proof agent for 1 minute; taken out and dried naturally for 3 minutes; then moved into the antibacterial and mildew-proof water-based epoxy insulating varnish and immersed for 2 minutes. During this process, the solution is continuously stirred at a low speed to avoid the sedimentation of powder particles; taken out and dried naturally until no paint beads drip, and then placed in a high-temperature furnace for heating and drying. The heating temperature is 120°C and the insulation time is 120 minutes to obtain an insulating layer with antibacterial and mildew-proof functions.

[0056] Embodiment 4:

[0057] The above-mentioned highly effective antibacterial and mildew-proof water-based epoxy insulating paint of the present invention, its preparation method and construction process:

[0058] 1. Preparation of antibacterial and antifungal agent solution:

[0059] 3500g of deionized water was added to a 6L plastic tank, and 5g of UNIQ SPERSE 630U dispersant was added at the same time, and the mixture was dispersed at a speed of 1500r / min for 2min. Then, 500g of lanthanum pyridinethione and 500g of methylisothiazolinone were added to the aqueous solution to prepare a liquid with a mass concentration of 22.2%, and the mixture was dispersed at a speed of 2000r / min for 5min. The mixture was then moved to a sand mill with zirconium beads and ground until the powder particle size was 5um, and the material was filtered out.

[0060] 2. Preparation of antibacterial and anti-mildew water-based epoxy insulating paint stock solution:

[0061] 300g of water-based epoxy insulating paint was added into a 1L four-necked flask, and 1.5g of UNIQ FOAM 280W defoamer was added at the same time. The flask was placed in water, and a thermometer, a stirrer and a reflux condenser were installed. The stirring rate was set to 1000r / min, and heating was started. When the temperature in the four-necked flask reached 50°C, 300g of antibacterial and mildew-proof agent solution was added dropwise while stirring. The liquid was added dropwise within 30min, and the pH value of the solution was adjusted to 9 with ammonia water. The solution was stirred for 30min. After stirring, the solution was cooled and discharged to obtain the antibacterial and mildew-proof water-based epoxy insulating paint stock solution.

[0062] 3. Preparation of antibacterial and anti-mildew water-based epoxy insulating paint:

[0063] Before use, mix the water-based epoxy insulating paint and the antibacterial and mildew-proof water-based epoxy insulating paint stock solution in a mass ratio of 27:1; then, add deionized water, dilute it by half, and stir at a low speed for 5 minutes to obtain the antibacterial and mildew-proof water-based epoxy insulating paint.

[0064] 4. Construction process of antibacterial and anti-mildew water-based epoxy insulating paint:

[0065] During the copper wire varnishing process, the copper wire is first immersed in a diluted water-based epoxy insulating varnish without antibacterial and mildew-proof agent for 1 minute; taken out and dried naturally for 3 minutes; then moved into the antibacterial and mildew-proof water-based epoxy insulating varnish and immersed for 2 minutes. During this process, the solution is continuously stirred at a low speed to avoid the sedimentation of powder particles; taken out and dried naturally until no paint beads drip, and then placed in a high-temperature furnace for heating and drying. The heating temperature is 120°C and the insulation time is 120 minutes to obtain an insulating layer with antibacterial and mildew-proof functions.

[0066] Comparative Example 4:

[0067] The above-mentioned highly effective antibacterial and mildew-proof water-based epoxy insulating paint of the present invention, its preparation method and construction process:

[0068] 1. Preparation of antibacterial and antifungal agent solution:

[0069] 3500g of deionized water was added to a 6L plastic tank, and 5g of UNIQ SPERSE 630U dispersant was added at the same time, and the mixture was dispersed at a speed of 1500r / min for 2min; then, 500g of lanthanum pyridinethione was added to the aqueous solution to prepare a liquid with a mass concentration of 12.5%, and the mixture was dispersed at a speed of 2000r / min for 5min, and then the mixture was moved to a sand mill with zirconium beads and ground to a powder particle size of 5um, and the material was filtered out.

[0070] 2. Preparation of antibacterial and anti-mildew water-based epoxy insulating paint stock solution:

[0071] 300g of water-based epoxy insulating paint was added into a 1L four-necked flask, and 1.5g of UNIQ FOAM 280W defoamer was added at the same time. The flask was placed in water, and a thermometer, a stirrer and a reflux condenser were installed. The stirring rate was set to 1000r / min, and heating was started. When the temperature in the four-necked flask reached 50°C, 300g of antibacterial and mildew-proof agent solution was added dropwise while stirring. The liquid was added dropwise within 30min, and the pH value of the solution was adjusted to 9 with ammonia water. The solution was stirred for 30min. After stirring, the solution was cooled and discharged to obtain the antibacterial and mildew-proof water-based epoxy insulating paint stock solution.

[0072] 3. Preparation of antibacterial and anti-mildew water-based epoxy insulating paint:

[0073] Before use, mix the water-based epoxy insulating paint and the antibacterial and mildew-proof water-based epoxy insulating paint stock solution in a mass ratio of 27:1; then, add deionized water, dilute it by half, and stir at a low speed for 5 minutes to obtain the antibacterial and mildew-proof water-based epoxy insulating paint.

[0074] 4. Construction process of antibacterial and anti-mildew water-based epoxy insulating paint:

[0075] During the copper wire varnishing process, the copper wire is first immersed in a diluted water-based epoxy insulating varnish without antibacterial and mildew-proof agent for 1 minute; taken out and dried naturally for 3 minutes; then moved into the antibacterial and mildew-proof water-based epoxy insulating varnish and immersed for 2 minutes. During this process, the solution is continuously stirred at a low speed to avoid the sedimentation of powder particles; taken out and dried naturally until no paint beads drip, and then placed in a high-temperature furnace for heating and drying. The heating temperature is 120°C and the insulation time is 120 minutes to obtain an insulating layer with antibacterial and mildew-proof functions.

[0076] Embodiment 5:

[0077] The above-mentioned highly effective antibacterial and mildew-proof water-based epoxy insulating paint of the present invention, its preparation method and construction process:

[0078] 1. Preparation of antibacterial and antifungal agent solution:

[0079] 4000g of deionized water was added to a 6L plastic tank, and 5g of UNIQ SPERSE 680U dispersant was added at the same time, and the mixture was dispersed at a speed of 1500r / min for 2min. Then, 500g of samarium pyrithione and 500g of methylisothiazolinone were added to the aqueous solution to prepare a liquid with a mass concentration of 20%, and the mixture was dispersed at a speed of 2000r / min for 5min. The mixture was then moved to a sand mill with zirconium beads and ground until the powder particle size was 4um, and the material was filtered out.

[0080] 2. Preparation of antibacterial and anti-mildew water-based epoxy insulating paint stock solution:

[0081] 300g of water-based epoxy insulating paint was added into a 1L four-necked flask, and 1.5g of UNIQ FOAM 265W defoamer was added at the same time. The flask was placed in water, and a thermometer, a stirrer and a reflux condenser were installed. The stirring rate was set to 1000r / min, and heating was started. When the temperature in the four-necked flask reached 50°C, 300g of antibacterial and mildew-proof agent solution was added dropwise while stirring. The liquid was added dropwise within 30min, and the pH value of the solution was adjusted to 10 with ammonia water. The solution was stirred for 30min. After stirring, the solution was cooled and discharged to obtain the antibacterial and mildew-proof water-based epoxy insulating paint stock solution.

[0082] 3. Preparation of antibacterial and anti-mildew water-based epoxy insulating paint:

[0083] Before use, mix the water-based epoxy insulating paint and the antibacterial and mildew-proof water-based epoxy insulating paint in a mass ratio of 27:1; then, add deionized water, dilute it by half, and stir at a low speed for 5 minutes to obtain the antibacterial and mildew-proof water-based epoxy insulating paint.

[0084] 4. Construction process of antibacterial and anti-mildew water-based epoxy insulating paint:

[0085] During the copper wire varnishing process, the copper wire is first immersed in a diluted water-based epoxy insulating varnish without antibacterial and mildew-proof agent for 1 minute; taken out and dried naturally for 3 minutes; then moved into the antibacterial and mildew-proof water-based epoxy insulating varnish and immersed for 2 minutes. During this process, the solution is continuously stirred at a low speed to avoid the sedimentation of powder particles; taken out and dried naturally until no paint beads drip, and then placed in a high-temperature furnace for heating and drying. The heating temperature is 130°C and the insulation time is 150 minutes to obtain an insulating layer with antibacterial and mildew-proof functions.

[0086] Comparative Example 5:

[0087] The above-mentioned highly effective antibacterial and mildew-proof water-based epoxy insulating paint of the present invention, its preparation method and construction process:

[0088] 1. Preparation of antibacterial and antifungal agent solution:

[0089] 3500g of deionized water was added to a 6L plastic tank, and 5g of UNIQ SPERSE 630U dispersant was added at the same time, and the mixture was dispersed at a speed of 1500r / min for 2min. Then, 500g of lanthanum pyridinethione and 500g of methylisothiazolinone were added to the aqueous solution to prepare a liquid with a mass concentration of 22.2%, and the mixture was dispersed at a speed of 2000r / min for 5min. The mixture was then moved to a sand mill with zirconium beads and ground until the powder particle size was 5um, and the material was filtered out.

[0090] 2. Preparation of antibacterial and anti-mildew water-based epoxy insulating paint stock solution:

[0091] Add 300g of water-based epoxy insulating paint into a 1L four-necked flask, add 1.5g of UNIQ FOAM 280W defoamer at the same time, place it in water, install a thermometer, a stirrer and a reflux condenser, set the stirring rate to 1000r / min, and start heating; when the temperature in the four-necked flask reaches 50°C, start adding 300g of antibacterial and mildew-proof agent solution dropwise while stirring, add the liquid within 30min, and continue stirring for 30min. After stirring, cool and discharge the material to obtain the antibacterial and mildew-proof water-based epoxy insulating paint stock solution.

[0092] 3. Preparation of antibacterial and anti-mildew water-based epoxy insulating paint:

[0093] Before use, mix the water-based epoxy insulating paint and the antibacterial and mildew-proof water-based epoxy insulating paint stock solution in a mass ratio of 27:1; then, add deionized water, dilute it by half, and stir at a low speed for 5 minutes to obtain the antibacterial and mildew-proof water-based epoxy insulating paint.

[0094] 4. Construction technology of antibacterial and mildew-proof water-based epoxy insulating paint:

[0095] During the copper wire varnishing process, the copper wire is first immersed in a diluted water-based epoxy insulating varnish without antibacterial and mildew-proof agent for 1 minute; taken out and dried naturally for 3 minutes; then moved into the antibacterial and mildew-proof water-based epoxy insulating varnish and immersed for 2 minutes. During this process, the solution is continuously stirred at a low speed to avoid the sedimentation of powder particles; taken out and dried naturally until no paint beads drip, and then placed in a high-temperature furnace for heating and drying. The heating temperature is 120°C and the insulation time is 120 minutes to obtain an insulating layer with antibacterial and mildew-proof functions.

[0096] For comparison results, please see Figure 2 As shown, Note: a represents anti-Escherichia coli, and b represents anti-Staphylococcus aureus.

[0097] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

[0098] Table 1 Insulation paint performance test results of the present invention

[0099]

[0100]

Claims

1. A highly effective antibacterial and mildew-proof water-based epoxy insulating varnish, characterized in that: The raw material ratio is as follows: 48% to 50% water-based epoxy insulating varnish, 0.15% to 0.18% rare earth antibacterial agent of insulating varnish, 0.15% to 0.18% methylisothiazolinone, 0.08% to 0.1% dispersant, 0.02% to 0.03% defoaming agent, and 50% to 55% deionized water.

2. The highly effective antibacterial and mildew-proof water-based epoxy insulating varnish according to claim 1, characterized in that: The water-based epoxy insulating paint is FS7100 water-based epoxy insulating paint.

3. The highly effective antibacterial and mildew-proof water-based epoxy insulating varnish according to claim 1, characterized in that: The deionized water is prepared by a water purifier through filtration, reverse osmosis, and ion exchange.

4. The highly effective antibacterial and mildew-proof water-based epoxy insulating varnish according to claim 1, characterized in that: The dispersant may be any one of UNIQ SPERSE 630U, UNIQ SPERSE 650U, and UNIQ SPERSE 680U, and the defoamer may be any one of UNIQ FOAM 265W and UNIQ FOAM 280W.

5. The highly effective antibacterial and mildew-proof water-based epoxy insulating varnish according to claim 1, characterized in that: The rare earth antibacterial agent can be any one of cerium pyrithione, lanthanum pyrithione, europium pyrithione, and samarium pyrithione. The rare earth antibacterial agent is a white or dark green powder, and the heat-resistant temperature must be more than 220°C.

6. A method for preparing a highly effective antibacterial and mildew-proof water-based epoxy insulating varnish according to any one of claims 1 to 5, characterized in that: The following steps are involved: Step 1: Preparation of antibacterial and antifungal agent solution: Add 3000-4000g of deionized water into a 6L plastic jar, add 5g of dispersant, and disperse at a high speed of 1500r / min for 2min. Then, add 500g of pyridinethione rare earth and 500g of methylisothiazolinone into the above aqueous solution to prepare a liquid with a mass concentration of 20%-25%, and disperse at a high speed of 2000r / min for 5min. Then grind into powder particles and filter the material to obtain the antibacterial and antifungal agent solution; Step 2: Preparation of antibacterial and mildew-proof water-based epoxy insulating paint stock solution: Add 300g of water-based epoxy insulating paint to a 1L four-necked flask, add 1.5g of defoaming agent at the same time, place it in water, install a thermometer, agitator and reflux condenser, set the stirring rate to 1000r / min, and start heating. When the temperature in the four-necked flask reaches 50°C, start dripping 300g of the antibacterial and mildew-proof agent solution in step 1 while stirring, and add the liquid within 30 minutes. Adjust the solution pH to a suitable value with ammonia water, and continue stirring for 30 minutes. After stirring, cool and discharge the material to obtain the antibacterial and mildew-proof water-based epoxy insulating paint stock solution; Step 3: Preparation of antibacterial and mildew-proof water-based epoxy insulating paint: Mix the water-based epoxy insulating paint with the antibacterial and mildew-proof water-based epoxy insulating paint stock solution in step 2 at a mass ratio of 27:

1. Then add deionized water, dilute by half, and stir to obtain the antibacterial and mildew-proof water-based epoxy insulating paint.

7. The method for preparing a highly effective antibacterial and mildew-proof water-based epoxy insulating varnish according to claim 6, characterized in that: In step 1, after the liquid is dispersed, it is moved to a sand mill with zirconium beads for grinding, and the particle size of the ground powder needs to be less than 5um.

8. The method for preparing a highly effective antibacterial and mildew-proof water-based epoxy insulating varnish according to claim 6, characterized in that: In step 2, the pH value of the solution is adjusted to a range of 9 to 10 by using ammonia water.

9. The method for preparing a highly effective antibacterial and mildew-proof water-based epoxy insulating varnish according to claim 6, characterized in that: In step 3, when the water-based insulating paint is mixed with the antibacterial and mildew-proof water-based epoxy insulating paint stock solution, the solution is continuously stirred at a low speed for more than 5 minutes during this process.

10. A construction process for a highly efficient antibacterial and mildew-proof water-based epoxy insulating paint, according to any one of claims 1 to 9, characterized in that: The following steps are involved: Step 1: During the copper wire varnishing process, the copper wire is first immersed in a diluted water-based epoxy insulating varnish without antibacterial and mildew-proof agent for 1 minute, then taken out and dried naturally for 3 minutes; then moved into the antibacterial and mildew-proof water-based epoxy insulating varnish and immersed for 2 minutes. During this process, the solution is continuously stirred at a low speed to avoid the sedimentation of powder particles; Take it out and dry it naturally until no paint beads drip, then put it into a high-temperature furnace for heating and drying, the heating temperature is 120-130°C, and the insulation time is 120-180 minutes, so as to obtain an insulating layer with antibacterial and mildew-proof functions.

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