CN114316746B - Water-based nano insulating paint and preparation method and application thereof - Google Patents
Water-based nano insulating paint and preparation method and application thereof Download PDFInfo
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Abstract
The invention provides a water-based nano insulating paint and a preparation method and application thereof, and relates to the technical field of water-based insulating paints. The water-based nano insulating paint is prepared from the following raw materials in parts by weight: 75-142 parts of solid epoxy resin, 15-30 parts of emulsifier, 18-45 parts of film-forming assistant, 38-105 parts of water, 5.5-20 parts of closed curing agent and 0.5-4 parts of anti-sagging agent; the solid epoxy resin is bisphenol A type epoxy resin, and the molecular weight of the bisphenol A type epoxy resin is 1000-10000 g/mol; the emulsifier is nonionic reactive epoxy resin emulsifier. The insulating paint has the advantages of high insulating grade, high temperature and high pressure resistance, tensile and zigzag resistance, good adhesion, good chemical resistance and the like.
Description
Technical Field
The invention relates to the technical field of water-based insulating paint, in particular to water-based nano insulating paint, a preparation method and application thereof, and particularly relates to water-based insulating paint for preparing enamelled winding wires.
Background
The insulating paint is an electrically insulating paint, insulating paint liquid is coated on the surfaces of various bare metal electromagnetic circles, flat wires, metal conductors, electrical steel strips, laminated plates and other base materials to form an insulating coating, and the insulating coating is coated by a die, a felt roller and other equipment through one or more steps and is quickly cured at a high temperature of more than 280 ℃ to form a film so as to form a compact insulating layer, so that the conductive material is protected from mechanical damage and chemical corrosion, the service life of the product is prolonged, and the use safety is improved. The high-performance insulating paint is required to be uniformly cured at high temperature, no pinholes or bubbles exist, the coating is tough, tensile and bending resistant, the curved surface is not cracked under high-temperature impact, and the high-performance insulating paint is resistant to high temperature and high pressure, chemical corrosion and the like.
At present, most of high-performance insulating paints in the market are oily insulating paints, are mainly imported or outsourced brands, and are high in price, large in smell and poor in environmental protection. The traditional oily insulating paint is mainly a polyester, polyurethane and imine modified product, usually contains organic solvents, such as dimethylformamide, N-methyl pyrrolidone, imine or imide, toluene, xylene and other strong irritant solvents, and can release a large amount of irritant gases in the process of preparing electromagnetic wires by using the oily insulating paint, thereby seriously harming human health and polluting environment.
Based on the problems of the oil-based insulating paint, some water-based insulating paints, such as a water-based polyamide-imide system, a water-soluble polyester-amino system and the like, are available at present, but the product degree is low, the cost is high, and the performance is poor, such as low insulation grade, poor coating toughness, large brittleness, weak tensile and bending resistance, normal hammering of an insulating layer with a curved surface bent on the A, B surface of an electromagnetic flat wire or thermal shock cracking at above 220 ℃, uneven and non-compact curing, overproof bubbles and pinholes of the coating and the like. The water-based polyamide-imide system has larger smell and higher cost than the traditional oily insulating paint; other water-soluble polyester systems have the disadvantages of hydrolysis resistance, easy demulsification, easy layering and precipitation, high content of low-boiling point cosolvent (VOC), overproof formaldehyde release in the amino heating and curing process, low curing speed and the like.
The powder insulating paint is also sprayed on the surfaces of magnetic materials and plane metal insulators in a static way, but the insulating paint and the preparation process are difficult to realize on electromagnetic round, flat wires or irregular conductors, and the coating has the problems of low insulating grade, large particle size, more pinholes, easy bending and cracking, low voltage and high-temperature impact resistance and the like.
Disclosure of Invention
In view of the above, there is a need to provide an aqueous nano insulating paint, which has the advantages of high insulating grade, high temperature and pressure resistance, stretch and bending resistance, good adhesion, good chemical resistance, no need of using low boiling point organic solvent, less harm to human body and environment, and low product cost.
The water-based nano insulating paint is prepared from the following raw materials in parts by weight:
the solid epoxy resin is bisphenol A type epoxy resin, and the molecular weight of the bisphenol A type epoxy resin is 1000-10000 g/mol; the emulsifier is nonionic reactive epoxy resin emulsifier.
The water-based nano insulating paint is a water-based system, has good storage stability, and solves the problems of serious pollution of the existing oily insulating paint, poor storage stability, easy demulsification, high cost and the like of the existing water-based system. The insulating paint disclosed by the invention takes the bisphenol A epoxy resin with high molecular weight as a raw material, and is matched with other raw materials to jointly act, so that the performances of toughness, tensile bending resistance, high heat resistance, adhesiveness, chemical corrosion resistance and the like of the insulating paint can be improved, the raw material cost and the manufacturing cost are low, the environment-friendly property is good, and the blank of the domestic high-insulation-level water-based primary insulating paint is filled.
The water-based nano insulating paint is particularly suitable for being used as a primary insulating paint, and can be understood that the primary insulating paint is a single-component paint liquid which is coated on the surface of a bare conductor in a single way or multiple ways for the first time and is rapidly cured in a single way or multiple ways at high temperature to form a film, such as enamelled winding wire insulating paint, electrical steel pre-coating anti-corrosion insulating paint, wire-wrapped winding wire insulating paint and the like which are called primary insulating paint (and immersion type insulating paint for coils wound by enamelled winding wires is called secondary insulating paint), and the primary insulating paint has excellent performances of high insulating electrical property, high thermal impact resistance, high thermal conductivity, adhesiveness (multilayer coating but interlayer adhesiveness is good), flexibility, chemical resistance, high mechanical strength, adhesive strength and the like due to film forming compactness and curing uniformity. The water-based nano insulating paint is particularly suitable for primary insulating paint with high insulation grade of base materials such as aluminum, copper, glass fiber, insulating paper, laminated board, electrical steel band and the like, is beneficial to realizing 'oil-to-water' from the aspects of coating technology, economic benefit, environmental protection and the like, and greatly improves the problems of large amount of irritant gas release in the production process of enameled winding wires, VOC emission, high investment cost of environmental protection equipment and the like.
In one embodiment, the raw material also comprises 0-3 parts of an accelerant. The aqueous nano insulating paint can be added with or without an accelerant, so that the accelerant can be omitted, the cost of raw materials is saved, and the performance of the product is ensured.
In one embodiment, the accelerator is an accelerator with cyclic amidine structure, such as qiru R8901.
In one embodiment, the raw materials further comprise 1-5 parts of pigment. The pigment is used for identifying the product. Preferably, the pigment is a high-temperature resistant transparent pigment which does not fade at 200 ℃ or above and has good compatibility, color spreading property, high light transmittance, insulativity and the like with the epoxy resin. Such as high temperature transparent yellow and high temperature transparent red from weqing corporation.
In one embodiment, the solid epoxy resin is selected from: one or more of E03, E06, E07, E10, E12, E019 and E20.
The invention adopts the epoxy resin with high molecular weight, which is beneficial to improving the performances of toughness, tensile bending resistance, heat resistance and the like of the electromagnetic wire insulating layer.
In one embodiment, the nonionic reactive epoxy resin emulsifier is obtained by modifying polyoxyethylene ether with plant polyene phenol. The emulsifier can be mixed with water, and has the characteristics of no halogen, environmental protection, low foam, biodegradability, strong emulsifying capacity and the like. The emulsifier can be selected from nonionic reactive epoxy resin emulsifier of Dow, Solvay, tolosine, Tween, Adeca, etc.
In one embodiment, the emulsifier is a NSF-1801C phenolic reactive emulsifier available from technical and scientific Co.
The emulsifier is particularly suitable for a high molecular weight epoxy resin system, has strong emulsifying capacity, is not easy to sink and delaminate, has good wrapping property of emulsion particles, and has small influence on the heat resistance of a paint film.
In one embodiment, the coalescent is selected from: one or more of dipropylene glycol butyl ether, tripropylene glycol butyl ether, cetyl alcohol ester and ethylene glycol. The film forming additive can improve the solubility and the dispersibility of the epoxy resin, is beneficial to the uniform film forming of the emulsion in the high-temperature curing process, and improves the leveling property, the film forming compactness and the wettability to a substrate copper wire. The film-forming additive can improve the film-forming property of the primary insulating paint, the compatibility with epoxy resin and the color development of pigment. The film forming auxiliary agent with high boiling point (above 260 ℃) does not belong to the VOC calculation range, and the environmental protection property of the product can be improved.
In one embodiment, the anti-sagging agent is a polyurethane thickener. The anti-sagging agent can be selected from a medium-high shear polyurethane thickener or a low shear polyurethane thickener. The polyurethane thickener can reduce the appearance of paint-sagging tumors and prevent the tank liquor from settling.
Preferably, the polyurethane thickener is selected from: hamming modesty 105A thickener, hamming modesty 299 thickener, or both.
In one embodiment, the blocked curing agent is selected from: 4, 4' -diaminodiphenylmethane, diaminodiphenyl sulfone, cardanol, dicyandiamide, triglycidyl isocyanurate. The closed curing agent has the advantages of small molecular weight, small equivalent of active hydrogen, high crosslinking density and high heat resistance. The closed curing agent has good latency and low reaction crosslinking activity with epoxy emulsion at the temperature of below 80 ℃; the method is suitable for preparing insulating paint needing high-temperature forced curing, high-temperature tin printing such as coil steel, coil aluminum and the like, and water-based coatings of glass fiber and insulating paper.
The invention also provides a preparation method of the water-based nano insulating paint, which comprises the following steps:
melting: adding the solid epoxy resin, the emulsifier and the film-forming assistant into a reaction kettle, uniformly mixing, heating to 105-120 ℃, and preserving heat until the raw materials are molten to obtain a molten raw material;
emulsification and phase inversion: heating a part of water to 95-100 ℃ to be used as reverse phase water; taking the molten material, keeping the temperature at 105-120 ℃, shearing at the shearing speed of 2500-12000rpm, dropwise adding reverse water after shearing for a period of time, and shearing until the particle size D90 in the emulsion is less than or equal to 700nm to obtain the emulsion;
introducing a curing agent: dividing the rest water into two parts which are respectively used as post-drainage water and post-supplement water; adding water into the emulsion, cooling to below 80 ℃, adding a closed curing agent, and shearing at a shearing speed of 1000-1200rpm for 15-90 min; adding water, cooling to below 50 ℃, adding the rest raw materials, and mixing uniformly to obtain the water-based nano insulating paint.
In the preparation method, the melting and the emulsification are prepared step by step, raw materials such as epoxy resin and the like can be better melted at high temperature and fully dispersed uniformly in the melting step, the shearing head is prevented from deforming when encountering large-particle materials in the subsequent high-speed shearing process, so that the emulsification effect and the particle size of nanoparticles in the emulsion are influenced, the uniform melt is more favorable for high-speed homogeneous emulsification shearing, the raw materials are sheared into nanoparticles, the uniform and stable nano emulsion is favorably formed after phase inversion, and no precipitate is generated when the raw materials are diluted by adding water until the solid content is 15%. Although the reactivity of the latent curing agent and the epoxy resin is low, the inventor finds that the latent curing agent is easy to decompose high-activity amine when meeting water and at the temperature of more than 80 ℃, the material temperature is increased when the latent curing agent and the emulsion are sheared at high speed, the system reacts to generate the adverse phenomena of cross bonding, wire drawing and the like, further the curing uniformity of the insulating paint during application is caused, air holes and air bubbles are generated during high-temperature curing, the storage stability of the product is reduced, and further the insulating performance of the insulating paint is influenced. Therefore, the invention separates the steps of emulsification and introduction of the curing agent, prepares the emulsion at the temperature of the molten material, reduces the temperature in the system to be below 80 ℃, extends the chain at low temperature to improve the stability of the system, prevents the curing agent from generating the phenomena of reactive tackifying, wire drawing, agglomeration and the like in advance, and improves the insulativity and the storage stability of the product.
In the preparation method of the invention, water is added in three parts. Wherein, the reversed phase water is required to be heated to 95-100 ℃ in advance and kept warm, the temperature of the reversed phase water is ensured to be close to the temperature of the molten liquid (if the reversed phase water is dripped with low-temperature or normal-temperature water, the originally homogeneous hot melt liquid is suddenly cooled by cold water to generate condensation products so that the homogeneous hot melt liquid cannot be homogenized or homogeneous shear emulsion cannot be increased), the reversed phase water is dripped into a melting system to promote the melting liquid to be emulsified and homogenized and fully converted into oil-in-water, so that the homogeneous nano emulsion is obtained, and meanwhile, the storage stability of the insulating paint is improved, the film forming is uniform, and pin holes are reduced. After the addition of the later sewage, the hydrophilicity of the material can be further improved, and meanwhile, preparation is made for reducing the viscosity and temperature of the material and introducing the low-temperature chain extension of the closed curing agent. And adding water after adding to adjust the viscosity of the material before discharging.
The water-based nano insulating paint obtained by the preparation method is a water-soluble nano system, and the nano emulsion is uniformly dispersed and has good storage stability; the insulating paint is uniform in curing and can be rapidly cured at high temperature, and the obtained insulating paint film has excellent compactness, toughness, heat resistance, insulativity, tensile flexibility and other properties, and can be suitable for a multi-layer coating process of one-time insulating paint without influencing the interlayer adhesiveness.
In the prior art, the epoxy resin with low molecular weight is mostly adopted, and the epoxy resin with high molecular weight is rarely successfully applied to the water-based insulating paint mainly because: the emulsion prepared by the high molecular weight epoxy resin has large particle size, and is easy to precipitate and delaminate in construction liquid with low solid content to cause paint liquid heterogeneous; moreover, no closed curing agent matched with the high molecular weight epoxy resin emulsion exists, and no proper chain extension reaction method exists in the water-based insulating paint system.
According to the invention, a large number of tests and analyses are carried out to find the emulsifier with strong emulsifying capacity for the high molecular weight epoxy resin, namely the nonionic reaction type epoxy resin emulsifier prepared from the plant polyene phenol modified polyoxyethylene ether, so that the high molecular weight epoxy resin is successfully introduced, and the problems of precipitation delamination and heterogeneous phase are avoided; meanwhile, the emulsion is modified by adopting a closed curing agent applicable to the emulsion through a low-temperature chain extension technology, so that the end can be opened at a high temperature, and the reaction activity of crosslinking with the high-molecular-weight epoxy resin is provided.
In one embodiment, in the melting step, the molten material is kept warm for 1.5 to 2.5 hours. And preserving heat to fully melt the materials.
In one embodiment, in the emulsification and phase reversal step, the molten material is sheared for 12-60min, and phase reversal water is dropwise added, wherein the dropwise adding time of the phase reversal water is 15-25 min.
Preferably, the reaction system of the emulsification inversion and the introduction of the curing agent is carried out in a high-speed high-efficiency emulsification vessel (e.g. ZL202121615594.9, which is self-developed by the inventor) to achieve the nano-scale particle size of the emulsion.
Preferably, the incubation for the preparation of the reverse phase water is prepared in a reverse water preparation machine (e.g. the reverse water preparation machine from which the inventors self-developed, zl202121615810. x).
In one embodiment, the weight ratio of the reversed phase water, the post-watering water and the post-moisturizing water is (22-60): (15-40): (1-5).
In one embodiment, the reverse phase water is added dropwise within 15-25 min.
In one embodiment, the post-dewatering and post-replenishing water are normal temperature deionized water.
In one embodiment, the step of introducing the curing agent further comprises a filtering step: the product was sieved through a 120 mesh sieve and the retentate was removed.
The invention also provides application of the water-based nano insulating paint, the laminated board, the glass fiber or the insulating paper in preparation of the electromagnetic wire.
Compared with the prior art, the invention has the following beneficial effects:
the water-based nano insulating paint is emulsion with a nano particle size, has good wrapping property of emulsion particles, full compatibility of water and oil, good sealing property of a curing agent and good storage stability, is diluted into low-solid-content paint liquid with the solid content of 15-38 percent, does not precipitate and does not react to self-adhere after being stored at normal temperature and 50 ℃ for more than 6 months; the system is balanced and stable, and the thick smear paint cake manufactured at the high temperature of 260 ℃ does not generate bubbles or air holes. The invention takes water as solvent, adopts a small amount of film forming additive with the boiling point higher than 260 ℃, has the VOC volatile organic content lower than 3 percent, avoids the use of a large amount of organic solvent and the emission of a large amount of VOC, has excellent environmental protection compared with oil insulating paint, and fills the gap of domestic high-insulation-level water-based insulating paint.
In the process of coating and preparing the insulating paint for the enamelled winding wire by adopting the aqueous nano insulation, the high-temperature curing is uniform, the curing reaction speed is high, the raw materials are scientifically matched and interacted, and the obtained insulating layer has the performances of compactness, toughness, heat resistance, insulativity, tensile bending resistance, chemical resistance and the like. The curved surface of the insulating layer is not cracked by hot impact at 220 ℃, the normal high voltage of 5000V and the hot high voltage of 4000V are not broken down, and the hot electrical property, the mechanical strength, the flexibility, the adhesiveness and the chemical resistance (the resistance to refrigerant such as R134A/22, transformer oil and anhydride extraction) all reach the national standard and the standard: GB/T24122-2009, JB/T7599.1/7-1994200-.
The insulating paint has good adhesiveness and flexibility, is suitable for primer and finish paint, can be repeatedly coated in multiple ways, has good adhesiveness between a coating and an electromagnetic wire and between the coating and the coating, particularly does not influence the dipping paint hanging and adhesiveness of the secondary insulating paint of a coil on the primary insulating paint coating of an enamelled winding wire, and simplifies the complex procedures of channel paint mixing and coating of the primer and finish paint of the traditional solvent (oily) primary insulating paint.
According to the preparation method, the raw materials such as the high-molecular-weight epoxy resin and the like are melted and dispersed uniformly at high temperature to ensure the emulsification effect and obtain the nano particles, and uniform and stable nano emulsion is formed after phase inversion, so that no precipitate is generated even if the nano emulsion is diluted by adding water until the solid content is 15%; the steps of emulsifying and introducing the curing agent for low-temperature chain extension are separated, the temperature when the curing agent is introduced is ensured to be lower than 80 ℃, the phenomena of reactive tackifying, wire drawing, caking and the like of the curing agent in advance are prevented, and the insulativity and the storage stability of the product are improved.
Drawings
FIG. 1 is a state diagram of a baked cake of the insulating varnish of example 2.
FIG. 2 is an external view of a flat copper wire produced using the enamel of example 1.
FIG. 3 is a drawing showing a state after a hot stamping test for a curved surface of a flat copper wire prepared with the enamel of example 2.
Detailed Description
To facilitate an understanding of the invention, a more complete description of the invention will be given below in terms of preferred embodiments. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
In the following examples and comparative examples, the starting materials were all commercially available unless otherwise specified. Unless otherwise indicated, the methods of preparation or testing are those methods of preparation or testing known or customary in the art. The reverse phase water, the post-launching water and the post-replenishing water are all deionized water, the temperature of the reverse phase water is about 98 ℃, and the post-launching water and the post-replenishing water are deionized water at normal temperature (about 25 ℃).
Example 1
The raw material formulation of the water-based nano insulating paint is shown in Table 1.
The water-based nano insulating paint is prepared by the following method:
(1) adding the solid epoxy resin, the emulsifier and the film-forming assistant into a melting kettle, heating to 105-120 ℃, melting the raw materials, uniformly mixing, and keeping the temperature for 2 hours for later use.
(2) Introducing the molten raw material prepared in the step (1) into a homogenizing emulsification kettle through a heat-insulating pipeline, ensuring the temperature of the material to be 105-120 ℃, simultaneously adjusting the emulsification shearing speed to 2500rpm, and shearing for 30 min; dripping reversed phase water through a heat-insulating pipeline, wherein the temperature of the reversed phase water is about 98 ℃, dripping the reversed phase water within 20min, keeping the emulsifying and shearing speed at 2800rpm, inspecting the emulsion in the shearing process, and continuously shearing for 30min, wherein the particle size D90 of particles in the emulsion is less than or equal to 700nm to obtain the emulsion.
(3) And (3) introducing the emulsion prepared in the step (2) into water, reducing the shearing speed of an emulsifying head to 500rpm, adding a closed type curing agent when the temperature of the material is reduced to about 70 ℃, preserving the heat, continuously emulsifying and shearing at the uniform speed of 1000 plus 1200rpm for 60min, adding water after adding, cooling to about 50 ℃, adding the rest raw materials, stirring uniformly, filtering through 120-mesh filter cloth, removing trapped matters, and discharging.
Example 2
The raw material formulation of the water-based nano insulating paint is shown in Table 1. The preparation method of the water-based nano insulating paint is basically the same as that of the embodiment 1.
Example 3
The raw material formulation of the water-based nano insulating paint is shown in Table 1. The preparation method of the water-based nano insulating paint is basically the same as that of the embodiment 1.
Example 4
The raw material formulation of the water-based nano insulating paint is shown in Table 1. The preparation method of the water-based nano insulating paint is basically the same as that of the embodiment 1, and the difference is that in the step (3), when the temperature of the material is reduced to about 50 ℃, the accelerant is added together with other residual raw materials.
TABLE 1 EXAMPLES AND COMPARATIVE EXAMPLES raw materials and amounts (parts by weight) of the insulating varnish
Experimental example 1
The state of the materials in the above preparation process of the water-based insulating paint was observed, and the results are shown in Table 2.
TABLE 2 Material State
| Material state in preparation process | |
| Example 1 | No adverse phenomena such as viscosity increase, wire drawing and caking |
| Example 2 | No adverse phenomena such as thickening, wiredrawing and caking |
| Example 3 | No adverse phenomena such as viscosity increase, wire drawing and caking |
| Example 4 | No adverse phenomena such as thickening, wiredrawing and caking |
Experimental example 2
The indexes of the water-based insulating paint, such as viscosity, solid content, emulsion particle size and the like, are detected, and the results are shown in table 3.
TABLE 3 insulating varnish index
Experimental example 3
The above water-based insulating paint was tested for storage stability, and the results are shown in Table 4.
TABLE 4 storage stability of the insulating varnish
Experimental example 4
The water-based insulating paint is taken out, coated on a base material respectively, has the same size and thickness, and is baked for 5min at 260 ℃, and the result is shown in table 5.
TABLE 5 Patch State after baking of the insulating varnish
| Lacquer cake state | |
| Example 1 | The thick paint cake is cured evenly, smoothly and flatly |
| Example 2 | The thick paint cake cured evenly, smoothly and flatly (fig. 1) |
| Example 3 | The thick paint cake is cured evenly, smoothly and flatly |
| Example 4 | The thick paint cake is cured evenly, smoothly and flatly |
Experimental example 5
The water-based nano insulating paint of the embodiment 1 is respectively adopted to prepare copper flat wire coatings, and the copper flat wires with two specifications of super-thick specifications are manufactured by adopting the existing method, wherein the thickness of each copper flat wire is 3.5mm multiplied by 7mm and the thickness of each copper flat wire is 3mm multiplied by 11.2 mm. Film thickness: the single side is 50-60 μm.
The following performance tests were performed on the above copper flat wire, the test methods and results were as follows:
(1) appearance: checking whether the surface is smooth, has black spots or not, has bubbles or not and has external impurities or not. The copper flat wires of the two specifications have smooth surfaces, no black spots, no bubbles and no external impurities (figure 2).
(2) Flexibility and adhesion: at normal temperature, the paint film with the thickness of 3mm multiplied by 11.2mm and the width stretched by 30 percent does not crack, and the paint film with the thickness of 3.5mm multiplied by 7mm and the width stretched by 15 percent does not crack.
(3) Thermal shock: stretching by 15%, treating at 220 ℃, and ensuring that a paint film does not crack and A4A 4B curved surface does not crack; 10 percent of the tensile strength, the paint film does not crack when treated at 240 ℃, and the curved surface of 4A4B does not crack. As shown in fig. 3
(4) And (3) withstand voltage test: the voltage is more than or equal to 4KV, and the breakdown is avoided in 60 seconds.
(5) Elongation percentage: 3mm thick × 11.2mm wide line: not less than 35%, 3.5mm thick × 7mm wide line: not less than 30 percent.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (5)
1. The water-based nano primary insulating paint is characterized by being prepared from the following raw materials in parts by weight:
75-142 parts of solid epoxy resin,
15-30 parts of an emulsifying agent,
18-45 parts of a film-forming auxiliary agent,
38-105 parts of water, namely,
5.5 to 20 portions of latent curing agent,
0.5 to 4 portions of anti-sagging agent,
0-3 parts of an accelerating agent,
1-5 parts of pigment;
the solid epoxy resin is selected from: one or both of E12, E20; the emulsifier is NSF-1801C phenol reaction type emulsifier of the mature antibiotic-resistant biological material science and technology limited company; the latent curing agent is selected from: one or more of 4, 4' -diaminodiphenylmethane, diaminodiphenyl sulfone, cardanol, dicyandiamide and triglycidyl isocyanurate; the film-forming assistant is tripropylene glycol butyl ether;
the preparation method of the water-based nano primary insulating paint comprises the following steps:
melting: adding the solid epoxy resin, the emulsifier and the film-forming assistant into a reaction kettle, uniformly mixing, heating to 105-120 ℃, and preserving heat to obtain a molten material;
emulsification and phase inversion: heating a part of water to 95-98 ℃ to be used as reverse phase water; taking the molten material, keeping the temperature at 105-120 ℃, shearing at the shearing speed of 2500-12000rpm, dropwise adding reverse water after shearing for a period of time, and shearing until the particle size D90 in the emulsion is less than or equal to 700nm to obtain the emulsion;
introducing a curing agent: dividing the rest water into two parts which are respectively used as post-drainage water and post-supplement water; adding water into the emulsion, cooling to below 80 ℃, adding a latent curing agent, and shearing at a shearing speed of 1000-1200rpm for 15-90 min; adding water, cooling to below 50 ℃, adding the rest raw materials, and uniformly mixing to obtain the water-based nano primary insulating paint.
2. The aqueous nano primary insulating paint according to claim 1, wherein the anti-sagging agent is a polyurethane thickener.
3. The preparation method of the water-based nano primary insulating paint according to any one of claims 1 to 2, characterized by comprising the following steps:
melting: adding the solid epoxy resin, the emulsifier and the film-forming assistant into a reaction kettle, uniformly mixing, heating to 105-120 ℃, and preserving heat to obtain a molten material;
emulsification and phase inversion: heating a part of water to 95-98 ℃ to be used as reverse phase water; taking the molten material, keeping the temperature at 105-120 ℃, shearing at the shearing speed of 2500-12000rpm, dropwise adding reverse water after shearing for a period of time, and shearing until the particle size D90 in the emulsion is less than or equal to 700nm to obtain the emulsion;
introducing a curing agent: dividing the rest water into two parts which are respectively used as post-drainage water and post-supplement water; adding water into the emulsion, cooling to below 80 ℃, adding a latent curing agent, and shearing at the shearing speed of 1000-1200rpm for 15-90 min; adding water, cooling to below 50 ℃, adding the rest raw materials, and uniformly mixing to obtain the water-based nano primary insulating paint.
4. The preparation method according to claim 3, wherein in the melting step, the temperature is kept for 1.5-2.5 h;
in the emulsification and phase inversion step, the molten material is sheared for 12-60min, and phase inversion water is dripped for 15-25 min;
the weight ratio of the reversed phase water, the post-feeding water and the post-feeding water is (22-60): (15-40): (1-5);
the method also comprises a filtering step after the step of introducing the curing agent: the product was sieved through a 120 mesh sieve to remove the retentate.
5. Use of the aqueous nano-sized primary insulation paint according to any one of claims 1 to 2 for the preparation of enamelled winding wire, laminates, glass fibres or insulating paper.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210012299.7A CN114316746B (en) | 2022-01-06 | 2022-01-06 | Water-based nano insulating paint and preparation method and application thereof |
Applications Claiming Priority (1)
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| CN115050987B (en) * | 2022-06-28 | 2024-06-14 | 睿得新材料科技(佛山)有限公司 | Sealing material for protecting fuel cell membrane electrode and preparation method thereof |
| CN115521483B (en) * | 2022-09-02 | 2024-12-24 | 广州集泰化工股份有限公司 | A water-based bio-based epoxy emulsion, anti-corrosion coating, and preparation method and application thereof |
| EP4389830A1 (en) * | 2022-12-22 | 2024-06-26 | voestalpine Stahl GmbH | Metal sheet or strip with at least one coating on a flat side of the metal sheet or strip and method for producing the metal sheet or strip |
| CN118931317B (en) * | 2024-08-27 | 2025-01-28 | 广东顺德大地缘新材料有限公司 | Polyurethane modified epoxy water-based self-adhesive insulating varnish for enameled wire and preparation method and application thereof |
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