Water-based self-adhesive paint for low-temperature quick-drying direct-welding type high-viscosity enameled wire and preparation method of water-based self-adhesive paint

Abstract

The invention belongs to the field of water-based self-adhesive paint, and particularly relates to water-based self-adhesive paint for a low-temperature quick-drying direct-welding type high-viscosity enameled wire and a preparation method of the water-based self-adhesive paint. The water-based self-adhesive paint for the low-temperature quick-drying direct-welding type high-viscosity enameled wire, provided by the invention, is prepared from the following components in percentage by weight: 78 to 82 percent of anionic polycarbonate type polyurethane dispersoid, 0.2 to 2 percent of surface additive, 3 to 8 percent of polyurethane resin and 12 to 14.8 percent of deionized water. The low-temperature quick-drying direct-welding type high-viscous-force water-based self-adhesive paint provided by the invention has the advantages that the adhesion starting temperature is higher than 90 DEG C, the viscous force peak value is 155 DEG C, and the full-coating tinning temperature is not higher than 360 DEG C. The water-based self-adhesive paint can be used in various fields of ships, airplanes, high-speed rails, high-end engineering equipment, electronics, electrics, motors and the like, and can effectively enhance the insulating property, protect conductors and improve the equipment stability.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of water-based self-adhesive paint, and particularly relates to a low-temperature fast-drying direct-welding high-adhesion water-based self-adhesive paint for enameled wire and a preparation method. BACKGROUND

[0002] Under the trend of electronic and electrical equipment developing towards high performance and high integration, the performance of enameled wire as the core component of winding wire directly affects the reliability and energy efficiency of equipment such as motors and transformers. Although the traditional solvent-based self-adhesive enameled wire can realize the adhesion between paint films through heating, it has problems such as environmental pollution caused by organic solvent volatilization, high energy consumption of high-temperature curing, and complex process caused by the need to remove the adhesive layer before welding, which has made it difficult to meet the current demand for green manufacturing and efficient production. Especially in the field of new energy vehicles, photovoltaic inverters and other fields with strict requirements on temperature resistance and welding compatibility, the limitations of traditional products are further highlighted.

[0003] In recent years, water-based self-adhesive paint has become a research hotspot due to its low VOC emission and water as the dispersion medium, but its technical bottlenecks are still quite prominent. The existing water-based self-adhesive paint usually takes more than 2 hours to cure at room temperature, and its low-temperature fast-drying performance is generally insufficient, making it difficult to adapt to the high rhythm demand of automatic production lines.

[0004] At the same time, the balance between the adhesion strength (adhesion) and heat resistance of the existing water-based self-adhesive paint is difficult to control. If the adhesion is improved, the paint film will be easily brittle, and delamination or bubble defects will occur at high welding temperatures (usually 390-400℃).

[0005] In addition, some products add excessive plasticizers to improve adhesion, which actually reduces the long-term bending performance of enameled wire, limiting its application in dynamic scenarios such as high-frequency windings.

[0006] The current market urgently needs water-based self-adhesive paint with low-temperature fast-drying, direct-welding compatibility and high adhesion. For example, new energy vehicle drive motors require enameled wire to be quickly cured at 120℃ to improve production line efficiency, while also needing to meet the requirement of not damaging adjacent paint films during welding to ensure the integrity of the winding. Household appliance frequency conversion compressors require paint films to maintain high adhesion in a wide temperature range of -30℃ to 150℃ to avoid interlayer displacement. However, existing products are difficult to meet the core indicators of low-temperature fast curing, direct welding without adhesive layer, and high adhesion at the same time, and technical innovation is needed in different dimensions such as resin system design, curing mechanism optimization and functional filler compounding to break through the existing application bottlenecks.

[0007] Therefore, there is an urgent need in the field for a water-based self-adhesive paint that can solve the above problems. SUMMARY

[0008] In view of the shortcomings of the prior art, the present invention provides a water-based self-adhesive varnish for low-temperature fast-drying direct-soldering high-adhesion enameled wire and its preparation method. The provided water-based self-adhesive varnish for low-temperature fast-drying direct-soldering high-adhesion enameled wire can achieve low-temperature tinning and has good fast-drying and self-adhesive properties.

[0009] To achieve the first objective, this invention provides a low-temperature, fast-drying, direct-soldering, high-adhesion enameled wire water-based self-adhesive varnish, comprising the following components by weight percentage: Anionic polycarbonate-type polyurethane dispersions: 78-82%; Surface additives 0.2~2%; 3-8% polyurethane resin; Deionized water 12~14.8%.

[0010] Optionally, the low-temperature fast-drying direct-soldering high-adhesion enameled wire uses a water-based self-adhesive varnish, which, by weight percentage, comprises the following components: Anionic polycarbonate-type polyurethane dispersion 78%; Surface additives 2%; 8% polyurethane resin; 12% deionized water.

[0011] Optionally, the low-temperature fast-drying direct-soldering high-adhesion enameled wire uses a water-based self-adhesive varnish, which, by weight percentage, comprises the following components: Anionic polycarbonate-type polyurethane dispersion: 80.7%; Surface additives 0.3%; 5% polyurethane resin; Deionized water 14%.

[0012] Optionally, the low-temperature fast-drying direct-soldering high-adhesion enameled wire uses a water-based self-adhesive varnish, which, by weight percentage, comprises the following components: Anionic polycarbonate-type polyurethane dispersion: 82%; Surface additives 0.2%; 3% polyurethane resin; Deionized water 14.8%.

[0013] Optionally, the anionic polycarbonate polyurethane dispersion is any one of the following: DIC's polycarbonate polyurethane dispersion with model number WATERSOLUD-5002, Covestro's polycarbonate polyurethane dispersion with model number Baydydrol® UH2110, and Foshan Shunde Dadi Yuan Electronic Technology Co., Ltd.'s anionic polycarbonate polyurethane dispersion with model number DRDS5003.

[0014] Preferably, the anionic polycarbonate polyurethane dispersion is the anionic polycarbonate polyurethane dispersion with product model DRDS5003 from Foshan Shunde Dadi Yuan Electronic Technology Co., Ltd.

[0015] Optionally, the surface additive is a polyether-modified dimethylpolysiloxane copolymer solution; Preferably, the polyether-modified dimethyl polysiloxane copolymer solution is the polyether-modified dimethyl polysiloxane copolymer solution of BYK Corporation, model number BYK-349.

[0016] Optionally, the polyurethane resin is an anionic aliphatic waterborne polyurethane; Preferably, the polyurethane resin is a general-purpose anionic aliphatic waterborne polyurethane, including but not limited to one or more polyurethane resins from Wanhua Chemical Group Co., Ltd. with product models Adwel® 1630A, 1630B, and 1630C.

[0017] More preferably, the polyurethane resin is the polyurethane resin of Wanhua Chemical Group Co., Ltd., with the product model Adwel®1630B.

[0018] Optionally, the low-temperature fast-drying direct-soldering high-adhesion enameled wire has a water-based self-adhesive coating with an initial tack temperature higher than 90°C, a peak adhesion temperature of 155°C, and a full coating tinning temperature not higher than 360°C.

[0019] Preferably, the low-temperature fast-drying direct-soldering high-adhesion enameled wire has a water-based self-adhesive coating with an initial tack temperature higher than 90°C, a peak adhesion temperature of 155°C, and a full coating tinning temperature of 340~360°C.

[0020] The second objective of this invention is to provide a method for preparing the above-mentioned low-temperature fast-drying direct-soldering high-adhesion enameled wire using water-based self-adhesive varnish, specifically including the following steps: Weigh out the anionic polycarbonate polyurethane dispersion, surface additives, polyurethane resin, and deionized water according to the specified amounts; Anionic polycarbonate-type polyurethane dispersion, surface additives, polyurethane resin, and deionized water are added, stirred, and discharged to obtain a low-temperature fast-drying direct-soldering high-adhesion enameled wire waterborne self-adhesive varnish.

[0021] Optionally, the stirring speed is 300~400 rpm; Optionally, the stirring time is 30 to 60 minutes.

[0022] A third objective of this invention is to provide a wire for electronic and electrical equipment, wherein the coating layer of the wire comprises the above-mentioned low-temperature fast-drying direct-soldering high-adhesion enameled wire water-based self-adhesive varnish or the low-temperature fast-drying direct-soldering high-adhesion enameled wire water-based self-adhesive varnish obtained by the above preparation method.

[0023] Optionally, the low-temperature fast-drying direct-soldering high-adhesion enameled wire coated with water-based self-adhesive enamel can be used in electronic and electrical products in high-end engineering equipment such as ships, aircraft, and high-speed trains.

[0024] The beneficial effects of this invention are: (1) The low-temperature fast-drying direct-welding high-adhesion enameled wire provided by the present invention uses water-based self-adhesive paint with high solid content as a low-temperature direct-welding self-adhesive paint coating. It can achieve low-temperature fast drying, energy saving, and high-speed production of enameled wire with a smooth and particle-free appearance. It can be widely used in various fields such as ships, aircraft, high-speed rail, high-end engineering equipment, electronics, electrical, and motors. It can effectively enhance insulation performance, protect conductors, and improve equipment stability.

[0025] (2) This invention introduces anionic polycarbonate polyurethane dispersion (containing polycarbonate) and surface additives. By combining the polyether segments of BYK-349 (surface additive) with the polar groups of polycarbonate, the low surface energy characteristics of the siloxane backbone are used to reduce the surface tension of the coating, improve wettability and leveling, and ensure the stability and recoatability of the coating. At the same time, it increases the drying rate of the self-adhesive varnish. The enameled wire prepared based on the self-adhesive varnish of this invention can have a drying rate of 175 m / min under the temperature conditions of 200℃~230℃ and has strong self-adhesion. Compared with the prior art, it greatly improves the production efficiency of enameled wire and significantly reduces the energy consumption cost of self-adhesive enameled wire.

[0026] (3) This invention combines anionic polycarbonate polyurethane dispersion, polyurethane resin and surface additives (silicon-based modifiers) and optimizes the process components. The anionic polycarbonate polyurethane dispersion enhances the reaction rate through polar groups (-OH, -COOH) and works synergistically with the surface additives to enhance adhesion, so that the self-adhesive paint can be tinned at a minimum temperature of 340℃×2s. It has excellent low-temperature solderability and has important application value. Attached Figure Description

[0027] Figure 1 The graph shows the adhesion test results of the water-based self-adhesive paints obtained in Examples 1-3 and the comparative example. Detailed Implementation

[0028] To make the objectives, technical solutions, and effects of this invention clearer and more explicit, the invention is further described in detail below. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0029] The terms “comprising,” “including,” “having,” “containing,” or any other variations thereof, as used herein, are intended to cover non-exclusive inclusion. For example, a composition, step, method, article, or apparatus that includes the listed elements is not limited to those elements and may also include other elements not expressly listed or elements inherent to such composition, step, method, article, or apparatus.

[0030] "Optional" or "any one" means that the matter or event described thereafter may or may not occur, and the description includes both the possibility that the event will occur and the possibility that the event will not occur.

[0031] The indefinite articles “a” and “an” preceding an element or component of this invention do not impose any limitation on the quantity (i.e., number of occurrences) of the element or component. Therefore, “an” or “a” should be interpreted as including one or at least one, and the singular form of an element or component also includes the plural form, unless the quantity clearly refers only to the singular form.

[0032] The terms "one embodiment," "some embodiments," "exemplary," "specific example," or "some examples," etc., used in this invention refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the invention. In this document, the illustrative expressions of the above terms are not necessarily directed at the same embodiment or example.

[0033] The numerical range of the present invention includes not only the point values ​​listed in the embodiments, but also any point values ​​not listed that fall within the numerical range of the present invention. Due to space limitations and for the sake of brevity, the present invention will not exhaustively list all the specific point values ​​included in the range.

[0034] In the following examples, unless otherwise specified, all reagents and consumables were purchased from conventional reagent manufacturers in the field.

[0035] Some of the reagents used in this invention are from the following sources: The anionic polycarbonate polyurethane dispersion is a commercially available product and can be selected from any of the following: DIC's WATERSOL UD-5002 polycarbonate polyurethane dispersion, Covestro's Baydydrol® UH2110 polycarbonate polyurethane dispersion, and Foshan Shunde Diyuan Electronic Technology Co., Ltd.'s DRDS5003 anionic polycarbonate polyurethane dispersion, with a solid content of 35%.

[0036] The surface additive was a commercially available solution of dimethyl polysiloxane copolymer modified with common polyether, purchased from BYK-Chemie GmbH, product model BYK-349.

[0037] The polyurethane resin was a commercially available common anionic aliphatic waterborne polyurethane, purchased from Wanhua Chemical Group Co., Ltd., product model Adwel® 1630B.

[0038] This embodiment provides a low-temperature, fast-drying, direct-soldering, high-adhesion enameled wire water-based self-adhesive varnish, which specifically includes the following components by weight: Anionic polycarbonate-type polyurethane dispersions: 78-82%; Surface additives 0.2~2%; 3-8% polyurethane resin; Deionized water 12~14.8%.

[0039] In one specific embodiment, the water-based self-adhesive varnish for low-temperature fast-drying direct-soldering high-adhesion enameled wire comprises the following components by weight: Anionic polycarbonate-type polyurethane dispersion 78%; Surface additives 2%; 8% polyurethane resin; 12% deionized water.

[0040] In one specific embodiment, the water-based self-adhesive varnish for low-temperature fast-drying direct-soldering high-adhesion enameled wire comprises the following components by weight: Anionic polycarbonate-type polyurethane dispersion: 80.7%; Surface additives 0.3%; 5% polyurethane resin; Deionized water 14%.

[0041] In one specific embodiment, the water-based self-adhesive varnish for low-temperature fast-drying direct-soldering high-adhesion enameled wire comprises the following components by weight: Anionic polycarbonate-type polyurethane dispersion: 82%; Surface additives 0.2%; 3% polyurethane resin; Deionized water 14.8%.

[0042] In some specific embodiments, the anionic polycarbonate polyurethane dispersion is any one of the following: DIC's WATERSOL UD-5002 polycarbonate polyurethane dispersion, Covestro's Baydydrol® UH2110 polycarbonate polyurethane dispersion, and Foshan Shunde Dadi Yuan Electronic Technology Co., Ltd.'s DRDS5003 anionic polycarbonate polyurethane dispersion.

[0043] In one specific embodiment, the anionic polycarbonate polyurethane dispersion is the anionic polycarbonate polyurethane dispersion with product model DRDS5003 from Foshan Shunde Dadi Yuan Electronic Technology Co., Ltd., with a solid content of 35%.

[0044] The anionic polycarbonate-type polyurethane dispersion used in this embodiment has a high Tg (temperature resistance), which imparts rigidity to the paint film. However, excessively high polycarbonate content can lead to brittleness and cracking of the paint film. Therefore, this invention also incorporates polyurethane resin. The flexibility of the polyurethane resin can mitigate the rigidity introduced by the addition of polycarbonate to the anionic polycarbonate-type polyurethane dispersion, thus balancing the paint film performance.

[0045] When tinning, the solder needs to penetrate contaminants (such as moisture and dust) or the natural oxide layer on the surface of the coating to bond with the substrate. The chemical stability of the polycarbonate backbone (-O-CO-O-) is superior to that of traditional polyester, reducing the degradation of the coating due to water absorption during storage or construction, lowering the content of polar groups such as carboxyl groups on the surface, and reducing weak interactions with the solder (such as hydrogen bonds).

[0046] In some specific embodiments, the surface additive is a polyether-modified dimethylpolysiloxane copolymer solution.

[0047] In one specific embodiment, the polyether-modified dimethyl polysiloxane copolymer solution is a polyether-modified dimethyl polysiloxane copolymer solution of BYK Corporation, model number BYK-349.

[0048] The BYK-349 used in this embodiment reduces surface tension and improves wettability. The reaction between the polycarbonate in the anionic polycarbonate-type polyurethane dispersion and the urethane bonds (including -OH and -NH-) in the polyurethane resin increases the density of polar groups in the paint film, thereby increasing the surface energy of the paint film. This balances with the low surface energy of BYK-349, ensuring that the overall surface energy of the paint film is sufficiently high while reducing the actual contact angle through the directional arrangement of siloxanes. At the same time, the low surface energy of BYK-349 can suppress Bénard vortices (ripples caused by local convection of fluid) caused by the surface tension gradient during the paint film drying process, thereby regulating the solvent evaporation rate and ensuring that the paint film maintains uniform flow before curing, forming a smooth and flat surface.

[0049] Simultaneously, the anionic polycarbonate-type polyurethane dispersion and BYK-349 synergistically reduce microcracks caused by internal stress in the coating film, further improving surface integrity. The hydrophilicity of the polyether segments in BYK-349 lowers the initial drying temperature of the coating film, while the low surface energy of the siloxane backbone reduces the risk of "skinning" on the coating film surface, allowing moisture to escape evenly from the interior of the coating film and avoiding localized overheating. The hydroxyl groups (-OH) of the polycarbonate and polyurethane resin in the anionic polycarbonate-type polyurethane dispersion can react rapidly with the residual isocyanate groups (-NCO) to form urethane bonds, shortening the surface drying time and reducing the decrease in wettability of the solder due to high-temperature oxidation.

[0050] In some specific embodiments, the polyurethane resin is anionic aliphatic waterborne polyurethane. The urethane bonds (-NH-CO-O-) of the waterborne polyurethane resin can form a three-dimensional network structure through self-crosslinking or reaction with the hydroxyl groups of polycarbonate, thereby improving the density of the coating film, hindering oxygen penetration, inhibiting the formation of an oxide layer on the surface of the coating film, and thus reducing the oxidation interface resistance between the solder and the coating film.

[0051] In some specific embodiments, the polyurethane resin is a general-purpose anionic aliphatic waterborne polyurethane, including but not limited to one or more of Adwel® 1630A, 1630B, and 1630C.

[0052] In one specific embodiment, the polyurethane resin is Wanhua Chemical Group Co., Ltd.'s polyurethane resin with product model Adwel® 1630B.

[0053] In some specific implementations, the low-temperature fast-drying direct-soldering high-adhesion enameled wire has a starting temperature of over 90°C for water-based self-adhesive varnish, a peak adhesion temperature of 155°C, and a tinning temperature of no more than 360°C for the entire coating.

[0054] In one specific implementation, the low-temperature fast-drying direct-soldering high-adhesion enameled wire has a water-based self-adhesive coating with an initial tack temperature higher than 90°C, a peak adhesion temperature of 155°C, and a full coating tinning temperature of 340~360°C.

[0055] In another embodiment, the present invention provides a method for preparing the above-mentioned low-temperature fast-drying direct-soldering high-adhesion enameled wire using water-based self-adhesive varnish, specifically including the following steps: S1. Weigh out the anionic polycarbonate polyurethane dispersion, surface additives, polyurethane resin, and deionized water according to the specified amounts; S2. After adding anionic polycarbonate polyurethane dispersion, surface additives, polyurethane resin, and deionized water, stir and discharge to obtain a low-temperature fast-drying direct-soldering high-adhesion enameled wire waterborne self-adhesive paint.

[0056] In some specific embodiments, the stirring speed in step S2 is 300~400 rpm. As an example, the stirring speed can be 300 rpm, 320 rpm, 325 rpm, 340 rpm, 350 rpm, 360 rpm, 375 rpm, 380 rpm, or 400 rpm, as long as the stirring speed is within this range.

[0057] In some specific embodiments, the stirring time in step S2 is 30 to 60 minutes. As an example, the stirring time can be 30 minutes, 35 minutes, 40 minutes, 45 minutes, 50 minutes, 55 minutes, or 60 minutes, as long as the stirring time is within this range.

[0058] Another embodiment of the present invention provides a wire for electronic and electrical equipment, wherein the coating layer of the wire comprises the above-mentioned low-temperature fast-drying direct-soldering high-adhesion enameled wire water-based self-adhesive varnish or the low-temperature fast-drying direct-soldering high-adhesion enameled wire water-based self-adhesive varnish obtained by the above preparation method.

[0059] In some specific implementations, using low-temperature fast-drying direct-soldering high-adhesion enameled wire coated with water-based self-adhesive enamel in high-end engineering equipment such as ships, aircraft, and high-speed trains can effectively enhance insulation performance, protect conductors, and improve equipment stability.

[0060] The present invention will be further illustrated below through specific embodiments: Example 1 (5003#) A water-based self-adhesive varnish for low-temperature, fast-drying, direct-soldering high-adhesion enameled wire, comprising the following components by weight: Anionic polycarbonate polyurethane dispersion DRDS5003 82% Surface additive BYK-349 0.2% Adwel® 1630B polyurethane resin 3% Deionized water 14.8%.

[0061] Weigh out the above components according to the specified amounts, and add the anionic polycarbonate polyurethane dispersion DRDS5003, surface additive BYK-349, polyurethane resin Adwel® 1630B, and deionized water in sequence. Stir at 300 rpm for 30 minutes, and discharge to obtain a low-temperature fast-drying direct-soldering high-adhesion enameled wire waterborne self-adhesive varnish.

[0062] Example 2 (5003-2#) A water-based self-adhesive varnish for low-temperature, fast-drying, direct-soldering high-adhesion enameled wire, comprising the following components by weight: Anionic polycarbonate-type polyurethane dispersion DRDS5003 80.7% Surface additive BYK-349 0.3% Adwel® 1630B 5% polyurethane resin Deionized water 14.0%.

[0063] Weigh out the above components according to the specified amounts, and add the anionic polycarbonate polyurethane dispersion DRDS5003, surface additive BYK-349, polyurethane resin Adwel® 1630B, and deionized water in sequence. Stir at 300 rpm for 60 minutes, and discharge to obtain a low-temperature fast-drying direct-soldering high-adhesion enameled wire waterborne self-adhesive varnish.

[0064] Example 3 (5003-3#) A water-based self-adhesive varnish for low-temperature, fast-drying, direct-soldering high-adhesion enameled wire, comprising the following components by weight: Anionic polycarbonate-type polyurethane dispersion DRDS5003 78% Surface additive BYK-3492% Adwel® 1630B8% polyurethane resin 12% deionized water.

[0065] Weigh out the above components according to the specified amounts, and add the anionic polycarbonate polyurethane dispersion DRDS5003, surface additive BYK-349, polyurethane resin Adwel® 1630B, and deionized water in sequence. Stir at 400 rpm for 30 minutes, and discharge to obtain a low-temperature fast-drying direct-soldering high-adhesion enameled wire waterborne self-adhesive varnish.

[0066] Comparative Example This comparative example is a water-based self-adhesive varnish and a water-based insulating varnish, and the preparation method is as follows: According to the weight proportions, 72 parts of modified epoxy resin, 5.5 parts of aromatic waterborne polyurethane resin with an unsealing temperature of 70~110℃, 0.3 parts of BYK349, and 22.2 parts of deionized water are stirred and mixed evenly to obtain waterborne self-adhesive insulating varnish.

[0067] The preparation method of the modified epoxy resin is as follows: According to the weight proportions, 26.4 parts of E20 resin, 6.6 parts of 638S epoxy resin, and 20.6 parts of diethylene glycol monobutyl ether were stirred and dissolved evenly at 130℃. Then, mixed solution B, which was composed of 2.1 parts of 85% phosphoric acid solution and 3.0 parts of ethylene glycol monobutyl ether, was added dropwise over 20 minutes. The reaction was then stirred for 1 hour. The temperature was lowered to 60℃, and 4.8 parts of diethanolamine were added and stirred for 20 minutes. Then, 36.5 parts of deionized water were added in three portions, and the mixture was stirred evenly and kept for 30 minutes. The temperature was then lowered to 50℃, filtered, and packaged to obtain the modified epoxy resin.

[0068] Performance Test 1. The water-based self-adhesive paint products prepared in Examples 1 to 3 and the comparative examples were tested to detect their various properties. The test standards were in accordance with GB / T 6109.16-2008, and the results are shown in Table 1.

[0069] Table 1. Performance test results of water-based self-adhesive paints in Examples 1-3 and comparative examples.

[0070] Note: The drying rate test results in the table above indicate that the drying rate of Examples 1-3 can reach 175 m / min under the conditions of 200℃-230℃.

[0071] 2. Self-adhesive strength test (unit: N) was conducted on the water-based self-adhesive paints of Examples 1-3 and the comparative example.

[0072] Specifications: 0.15mm + QA base film 10~12μm, self-adhesive film thickness 10~12μm, baking time 15min. Test results are shown in Table 2 and... Figure 1 As shown.

[0073] Table 2 shows the adhesion test results of Examples 1-3 and the comparative examples.

[0074] *The unit of viscosity in Table 2 is N.

[0075] Through Tables 1-2 and Figure 1 It can be known that: The water-based self-adhesive paint provided by this invention has a starting temperature higher than 90℃, a peak adhesion value of 155℃ (155℃, 15min), and an adhesion value of 0.69~0.74N, exhibiting excellent adhesion.

[0076] Although both the water-based self-adhesive varnish obtained in the comparative example and the water-based self-adhesive varnish provided in the examples have high solids content, strong adhesion, and good fast-drying properties, the water-based self-adhesive varnish in the comparative example requires two seconds to complete tinning at 410°C, while the self-adhesive varnish provided in the examples only requires two seconds at a temperature of 340~360°C after the enameled wire is produced. This shows that the tinning temperature of the water-based self-adhesive varnish obtained in the examples is much lower than that of the comparative example. Therefore, the water-based self-adhesive varnish provided by this invention has excellent tinning properties, enabling low-temperature tinning and reducing production energy consumption. Consequently, the self-adhesive varnish provided by this invention is better suited for use in fully automatic winding machine production lines and fully automatic electronic product production lines with tinning functions. It can greatly improve the production efficiency of electronic and electrical products in the soldering process, ensure soldering quality, and prevent damage to electronic components caused by desoldering, cold solder joints, etc., resulting in damage to transmission signals and electrical connections.

[0077] Furthermore, the maximum VOC content of the water-based self-adhesive paint provided in the comparative example is 5%, while the maximum VOC content of the embodiment is only 2%. That is, the water-based self-adhesive paint provided by the present invention can reduce the use of organic solvents with high VOC content while ensuring performance. It can reduce VOC emissions during the use of water-based self-adhesive paint, has no irritating odor, is more environmentally friendly, and has good market application prospects.

[0078] *The following are some descriptions of the water-based self-adhesive varnish for the low-temperature fast-drying direct-soldering high-adhesion enameled wire provided by this invention: (1) The description of "low temperature" in the title of the invention means that the water-based self-adhesive paint provided by the present invention can complete the tinning in two seconds at a temperature of 340~360℃; (2) The description of "fast drying" means that the water-based self-adhesive paint provided by the present invention can achieve a drying rate of 175 meters / minute under the condition of 200℃-230℃; (3) The term "direct welding" means that the water-based self-adhesive paint provided by this invention can be used directly for welding without removing the adhesive layer; (4) The description of “high adhesion” is that the water-based self-adhesive paint provided by the present invention can achieve an adhesion of 0.69~0.74N at 155℃ for 15min, which has good adhesion.

[0079] It should be understood that the application of the present invention is not limited to the examples above. Those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.

Claims

1. A water-based self-adhesive varnish for low-temperature, fast-drying, direct-soldering, high-adhesion enameled wire, characterized in that, It includes the following components by weight percentage: Anionic polycarbonate-type polyurethane dispersions: 78-82%; Surface additives 0.2~2%; 3-8% polyurethane resin; Deionized water 12~14.8%.

2. The water-based self-adhesive varnish for low-temperature fast-drying direct-soldering high-adhesion enameled wire according to claim 1, characterized in that, The water-based self-adhesive varnish for low-temperature fast-drying direct-soldering high-adhesion enameled wire comprises the following components by weight percentage: Anionic polycarbonate-type polyurethane dispersion 78%; Surface additives 2%; 8% polyurethane resin; 12% deionized water.

3. The water-based self-adhesive varnish for low-temperature fast-drying direct-soldering high-adhesion enameled wire according to claim 1, characterized in that, The water-based self-adhesive varnish for low-temperature fast-drying direct-soldering high-adhesion enameled wire comprises the following components by weight percentage: Anionic polycarbonate-type polyurethane dispersion: 80.7%; Surface additives 0.3%; 5% polyurethane resin; Deionized water 14%.

4. The water-based self-adhesive varnish for low-temperature fast-drying direct-soldering high-adhesion enameled wire according to claim 1, characterized in that, The water-based self-adhesive varnish for low-temperature fast-drying direct-soldering high-adhesion enameled wire comprises the following components by weight percentage: Anionic polycarbonate-type polyurethane dispersion: 82%; Surface additives 0.2%; 3% polyurethane resin; Deionized water 14.8%.

5. The water-based self-adhesive varnish for low-temperature fast-drying direct-soldering high-adhesion enameled wire according to any one of claims 1 to 4, characterized in that, The anionic polycarbonate polyurethane dispersion includes at least one of the following: DIC's polycarbonate polyurethane dispersion with product model WATERSOLUD-5002, Covestro's polycarbonate polyurethane dispersion with product model Baydydrol® UH2110, and Foshan Shunde Dadi Yuan Electronic Technology Co., Ltd.'s anionic polycarbonate polyurethane dispersion with product model DRDS5003.

6. The water-based self-adhesive varnish for low-temperature fast-drying direct-soldering high-adhesion enameled wire according to any one of claims 1 to 4, characterized in that, The surface additive is a polyether-modified dimethylpolysiloxane copolymer solution.

7. The water-based self-adhesive varnish for low-temperature fast-drying direct-soldering high-adhesion enameled wire according to any one of claims 1 to 4, characterized in that, The polyurethane resin is an anionic aliphatic waterborne polyurethane.

8. The water-based self-adhesive varnish for low-temperature fast-drying direct-soldering high-adhesion enameled wire according to claim 7, characterized in that, The polyurethane resin includes at least one of the polyurethane resins with product models Adwel® 1630A, 1630B, and 1630C from Wanhua Chemical Group Co., Ltd.

9. A method for preparing the water-based self-adhesive varnish for low-temperature fast-drying direct-soldering high-adhesion enameled wire according to any one of claims 1 to 8, characterized in that, Includes the following steps: Weigh out the anionic polycarbonate polyurethane dispersion, surface additives, polyurethane resin, and deionized water according to the specified amounts; The anionic polycarbonate-type polyurethane dispersion, the surface additives, the polyurethane resin, and the deionized water are added, stirred, and discharged to obtain the low-temperature fast-drying direct-soldering high-adhesion enameled wire waterborne self-adhesive paint.

10. A wire for use in electronic and electrical equipment, characterized in that, The coating of the wire comprises the water-based self-adhesive varnish for low-temperature fast-drying direct-soldering high-adhesion enameled wire as described in any one of claims 1-8, or the water-based self-adhesive varnish for low-temperature fast-drying direct-soldering high-adhesion enameled wire obtained by the preparation method described in claim 9.

Images