Curing acceleration insulation repair adhesive

Abstract

The invention relates to the technical field of power cables, in particular to a curing acceleration insulation repair adhesive, which comprises an epoxy resin base material, a silane coupling agent, an inorganic filler, a curing agent and a solvent, and is doped with a fragmented glass fiber mesh, and the fragmented glass fiber mesh is used as a filler to be mixed into a fluid adhesive; wherein the components comprise, by weight, 50%-58% of the epoxy resin base material, 0.7%-0.8% of the silane coupling agent, 22%-28% of the inorganic filler, 0.02%-0.03% of the curing agent and 1%-1.5% of the solvent; the glass fiber net comprises a net body and expanded glass fibers; the net body is formed by weaving warp yarns and weft yarns; the warps and the wefts are made of glass fibers; the lengths of at least part of the warps and at least part of the wefts exceed the net body part to form expanded glass fibers; the diameter of the glass fiber is 6.2 to 9.5 microns; the area of the net body is 0.55-2.5 mm < 2 >, and the area of the meshes is 0.01-0.18 mm < 2 >; the length of the expanded glass fiber ranges from 0.45 mm to 1.95 mm; 3-6 glass fiber meshes are arranged in each unit cubic centimeter according to the volume number of the glass fiber meshes; damaged insulating parts can be rapidly repaired, the strength is high, and the construction period is short.

Description

Technical Field

[0001] The invention relates to the technical field of power cables, and in particular to an insulation repair adhesive. Background Art

[0002] In the existing power system maintenance, the salt spray corrosion and pollution of insulation parts has always been a difficult problem that is difficult to completely solve. Due to environmental factors and material aging, conductive paths are easily formed on the surface of insulation parts, resulting in reduced insulation performance and even insulation breakdown failure.

[0003] Traditional repair methods, such as replacing insulation parts or using conventional APG processes, power ceramics, DMC and SMC die-cast insulation parts processes, can solve insulation problems to a certain extent, but these methods have disadvantages such as high cost, long construction period and limited repair effect. Summary of the invention

[0004] The purpose of this section is to summarize some aspects of the embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the abstract of the specification and the title of the invention of this application to avoid blurring the purpose of this section, the abstract of the specification and the title of the invention, and such simplifications or omissions cannot be used to limit the scope of the present invention.

[0005] In view of the above problems existing in the prior art, the present invention is proposed.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0007] The curing accelerated insulation repair adhesive comprises an epoxy resin base material, a silane coupling agent, an inorganic filler, a curing agent, a solvent, and is also doped with a fragmented glass fiber mesh, which is used as a filler and mixed into a fluid adhesive;

[0008] Among them, by weight percentage, epoxy resin base material 50%-58%, silane coupling agent 0.7%-0.8%, inorganic filler 22%-28%, curing agent 0.02%-0.03%, solvent 1%-1.5%;

[0009] The glass fiber mesh comprises a mesh body and expanded glass fibers;

[0010] The net body is woven with warp and weft;

[0011] Both the warp and weft threads are made of fiberglass;

[0012] The lengths of at least part of the warp threads and at least part of the weft threads are beyond the mesh body to form expanded glass fibers;

[0013] The diameter of glass fiber is 6.2-9.5 μm;

[0014] The area of ​​the mesh is 0.55-2.5mm 2 , mesh area is 0.01-0.18mm 2 ;

[0015] The length of the expanded glass fiber is 0.45-1.95mm;

[0016] Measured by volume, there are 3-6 glass fiber meshes per cubic centimeter.

[0017] The above design, through the use of curing agent and solvent, allows the fluid glue to maintain fluid properties when mixed with curing agent. When in use, the sprayed fluid glue quickly cures after the solvent evaporates quickly to form a fast-curing repair glue. The inorganic filler and epoxy resin have good insulation properties after curing, thereby ensuring the insulation performance of the repair glue. The 6.2-9.5μm glass fiber woven mesh has good softness and certain toughness. The area of ​​the mesh is 0.55-2.5mm 2 The fragmented glass fiber mesh is not easy to be tangled into a ball after being mixed into the polymer moisture-proof plugging glue as a filler. The mesh area is 0.01-0.18mm 2 , allowing the silicone base material to pass through the mesh and combine more strongly with the glass fiber mesh. Improve the strength of the fluid glue after curing. The diameter of the glass fiber is 6.2-9.5μm, and there are 3-6 glass fiber meshes per cubic centimeter. While ensuring the number of fiber meshes is moderate, ensure that the expanded glass fibers are intertwined as much as possible to form a three-dimensional mesh structure, improve the overall strength, and facilitate the magnetic field to produce a better effect.

[0018] Preferably, the silane coupling agent includes γ-aminopropyltriethoxysilane (KH330), γ-vinyltriethoxysilane (KH550) and γ-glycidyloxypropyltrimethoxysilane (KH570); these silane coupling agents have good water resistance and chemical resistance, can effectively improve the bonding effect between organic and inorganic materials, can improve the curing after curing, and accelerate the resistance of the insulation repair glue to salt spray corrosion and pollution problems.

[0019] Preferably, the inorganic filler includes aluminum oxide, silicon oxide, a 1:1 mixture of aluminum hydroxide and magnesium oxide, hollow glass microspheres and boron nitride; these materials have good insulation properties to improve the insulation properties of the insulation repair adhesive after curing. The particle size of the hollow glass microspheres is at the submicron to micron level, making it easy to mix with other materials to form a composite material. Due to the hollow structure, it has good insulation properties and a relatively low density.

[0020] Preferably, the curing agent includes a polyamide resin curing agent, a polyamide-amine type curing agent and a bio-based curing agent; these curing agents have the characteristics of fast curing of epoxy resin.

[0021] Preferably, the solvent includes a water-based solvent, a 1:1 mixed solvent of xylene and ethyl acetate, a dimethylformamide solvent and a butyl acetate solvent; since the main component of the water-based solvent is water, the VOC (volatile organic compound) emission of the water-based solvent is low and meets environmental protection requirements; xylene and ethyl acetate are both organic solvents with good volatility to ensure rapid solidification of the fluid adhesive.

[0022] Preferably, when drawing the glass fiber as one of the warp and weft, soft magnetic powder dust is sprayed to the molten glass fiber through a nozzle in a molten state, and the molten glass fiber is bonded with soft magnetic powder, and the particle size of the soft magnetic powder is 50-200nm; when drawing the other glass fiber as the warp and weft, graphite powder dust is sprayed to the molten glass fiber through a nozzle in a molten state, and the molten glass fiber is bonded with graphite powder, and the particles of the graphite powder are 6-10μm. The glass fiber is bonded with soft magnetic powder. The soft magnetic powder has soft magnetic properties, and can introduce the magnetic field into the deep of the fluid glue to form a relatively uniform magnetic field distribution in the fluid glue, thereby making the fluid glue with conductive properties relatively uniformly heated. The 50-200nm soft magnetic powder can form a more uniform dispersion in the glass fiber to enhance the magnetic properties. At this fine particle size, soft magnetic powder can improve the electromagnetic properties of the material and reduce losses, while providing better interaction and adhesion. 6-10μm graphite dust is relatively small and easy to disperse. After the fluid glue is cured, it is easy to disconnect the electrical contact to ensure the insulation performance of the insulation repair glue.

[0023] 0.7%-1% of a cross-linking agent is added to the fluid adhesive; the cross-linking agent is one of phthalic anhydride or pentylphthalic anhydride.

[0024] Furthermore, the fluid glue is assisted in curing by an auxiliary curing device, which includes an electromagnet, an oscillating circuit connected to the electromagnet to generate a magnetic field with periodic direction changes, and the electromagnet is close to the fluid glue coating position; the soft magnetic powder on the glass fiber can vibrate in the alternating magnetic field to expel the air in the fluid glue; the vibration also promotes the fit between the glass fiber and the fluid glue, and the graphite powder and the fluid glue are evenly mixed on the glass fiber mesh to form a conductive fluid.

[0025] The auxiliary curing equipment includes a microwave heating device, which generates an alternating magnetic field, and the fluid glue is heated and cured by the microwave heating device; the soft magnetic powder on the glass fiber has soft magnetic properties, which can introduce the magnetic field deep into the fluid glue, forming a relatively uniform magnetic field distribution in the fluid glue, thereby making the fluid glue with conductive properties heat relatively evenly.

[0026] The invention discloses a method for preparing a curing accelerated insulation repair adhesive, wherein the specific preparation steps are as follows: (a) epoxy resin, silane coupling agent, inorganic filler, and glass fiber mesh in a doped state are uniformly mixed in a reaction kettle according to a certain proportion, and the reaction kettle is vacuumized before mixing;

[0027] (b) adding a curing agent to the reaction kettle and stirring thoroughly to allow all components to react fully;

[0028] (c) adding solvent to the reaction kettle to adjust the viscosity of the coating to a state suitable for construction;

[0029] (d) transferring the treated fluid glue to another reaction kettle, adding a crosslinking agent thereto, stirring evenly, and then performing a vacuum treatment again to remove gas impurities that may be generated during the reaction;

[0030] (e) uniformly coating the prepared coating on the surface of the insulating part to be repaired;

[0031] (f) Curing under heating conditions to form a dense insulating protective layer.

[0032] In step (a), epoxy resin, silane coupling agent, inorganic filler in a specific ratio and glass fiber mesh in a doped shape are uniformly mixed in a reactor, and the reactor is vacuumed before mixing to ensure the purity of the reaction environment. Subsequently, the base material is heated to a suitable reaction temperature. While heating, stirring is continued to ensure that the base material is evenly heated and fully mixed. Through this series of operations, impurities in the base material can be effectively removed, and the purity and quality of the product can be improved.

[0033] In step (b) and step (c), the curing agent is slowly added under negative pressure, and stirring is continued until it is completely dissolved to avoid the generation of bubbles. Subsequently, a solvent is added to adjust the viscosity, and the volatilization of harmful gases is strictly controlled throughout the process. An electromagnetic induction heating furnace is also provided for heating the fluid glue in the reactor; the electromagnetic induction heating furnace has an automatic temperature control system, and the automatic temperature control system has a microprocessor system; the soft magnetic powder on the glass fiber net has soft magnetic properties, which can introduce the magnetic field into the depth of the fluid glue, forming a relatively uniform magnetic field distributed in the fluid glue, thereby making the fluid glue with conductive properties relatively uniformly heated; a temperature sensor is also provided in the reactor, and the temperature sensor is connected to the microprocessor system; the electromagnetic induction heating furnace is operated at high power below 80 degrees Celsius in the reactor; the electromagnetic induction heating furnace is operated at medium power above 80 degrees Celsius in the reactor, and the medium power is 50%-70% of the high power value; the electromagnetic induction heating furnace is operated at low power above 150 degrees Celsius in the reactor, and the low power is 20%-30% of the high power value. Because the specially designed glass fiber mesh of the present invention is used, the induction heat can be more evenly distributed inside the fluid glue, avoiding the problem of local flash evaporation caused by local overheating. At the same time, the staged heating power control is set according to the temperature, ensuring the heating efficiency while avoiding flash evaporation.

[0034] Step (d) In order to prevent the product from being affected by oxygen and moisture during storage and use, it is necessary to fill another reaction kettle with a protective gas, such as nitrogen or argon. The filling of the protective gas can effectively isolate harmful gases in the external environment, ensure the stability of the product and extend its shelf life. After the protective gas is filled, continue stirring to fully mix the protective gas with the base material to achieve a uniform distribution effect.

[0035] The fluid glue described in step (f) is assisted in curing by an auxiliary curing device, the electromagnet is close to the fluid glue coating position, the soft magnetic powder on the glass fiber can vibrate in the alternating magnetic field to expel the air in the fluid glue; while vibrating, it also promotes the tightness of the glass fiber and the fluid glue, the glass fiber net has graphite powder and the fluid glue uniformly mixed to form a conductive fluid, and the microwave heating device generates an alternating magnetic field to heat the conductive fluid. Under the heating condition, the crosslinking agent can react with the functional groups in the epoxy resin through a thermal reaction to form a crosslinking structure, quickly cure the epoxy resin base material, thereby forming a more solid insulating layer, and the cured structure can reduce the electrical contact between the graphite powder. Adding more insulating inorganic fillers (such as aluminum oxide, silicon oxide, hollow glass microspheres, boron nitride or a 1:1 mixture of aluminum hydroxide and magnesium oxide) to the epoxy resin to improve the insulation performance of the insulating repair glue after curing, these materials can be used together with graphite powder, and the electrical contact of the graphite powder in the fluid is cut off after the fluid glue is cured, so that the fluid glue maintains the insulating properties after curing, and the volume resistivity can reach 10^ 13Ω·cm or more, and the dielectric strength can reach over 20kV / mm.

[0036] Thus, a corrosion-resistant, high-strength, easy-to-use curing accelerated insulation repair adhesive is produced. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them:

[0038] Figure 1 A schematic diagram of the structural principle of a glass fiber mesh with smart grid access function according to an embodiment of the present invention;

[0039] Figure 2 A microscopic display of a glass fiber mesh with non-shortened expanded glass fibers having a smart grid access function as described in an embodiment of the present invention. DETAILED DESCRIPTION

[0040] In order to make the above-mentioned objects, features and advantages of the present invention more understandable, the specific implementation modes of the present invention are described in detail below in conjunction with the accompanying drawings.

[0041] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0042] Secondly, the present invention is described in detail with reference to schematic diagrams. When describing the embodiments of the present invention in detail, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0043] Furthermore, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in less than one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor is it a separate or selective embodiment that is mutually exclusive with other embodiments.

[0044] refer to Figure 1 and Figure 2 , curing accelerated insulation repair glue.

[0045] It includes epoxy resin base material, silane coupling agent, inorganic filler, curing agent, solvent, and is also doped with fragmented glass fiber mesh 1, with the fragmented glass fiber mesh 1 as filler, mixed into a fluid glue;

[0046] Among them, by weight percentage, epoxy resin base material 50%-58%, silane coupling agent 0.7%-0.8%, inorganic filler 22%-28%, curing agent 0.02%-0.03%, solvent 1%-1.5%;

[0047] The glass fiber mesh 1 includes a mesh body 11 and expanded glass fibers 12;

[0048] The net body 11 is woven with warp and weft;

[0049] Both the warp and weft threads are made of fiberglass;

[0050] The lengths of at least part of the warp threads and at least part of the weft threads are both beyond the mesh body 11, forming extended glass fibers 12;

[0051] The diameter of glass fiber is 6.2-9.5 μm;

[0052] The area of ​​the mesh body 11 is 0.55-2.5 mm2, and the mesh area is 0.01-0.18 mm2;

[0053] The length of the extended glass fiber 12 is 0.45-1.95 mm;

[0054] In terms of volume, there are 3-6 sheets of glass fiber mesh 1 per cubic centimeter.

[0055] The above design, through the coordinated use of curing agent and solvent, enables the fluid glue to maintain fluid properties when mixed with curing agent. When in use, the sprayed fluid glue is quickly cured after the solvent evaporates quickly to form a fast-curing repair glue. The inorganic filler and epoxy resin have good insulation properties after curing, thereby ensuring the insulation properties of the repair glue. The 6.2-9.5μm glass fiber woven mesh has good softness and certain toughness. The area of ​​the mesh body 11 is 0.55-2.5mm2. The fragmented glass fiber mesh 1 formed is not easy to tangle into a ball after being doped into the polymer moisture-proof plugging glue as a filler. The mesh area is 0.01-0.18mm2, which allows the silicone base material to pass through the mesh and has a stronger bond with the glass fiber mesh 1. Improve the strength of the fluid glue after curing. The diameter of the glass fiber is 6.2-9.5 μm, and there are 3-6 glass fiber meshes 1 per cubic centimeter. While ensuring the number of fiber meshes is moderate, the expanded glass fibers 12 are staggered as much as possible to form a three-dimensional network structure, thereby improving the overall strength and facilitating a better magnetic field generation effect.

[0056] Preferably, the silane coupling agent includes γ-aminopropyltriethoxysilane (KH330), γ-vinyltriethoxysilane (KH550) and γ-glycidyloxypropyltrimethoxysilane (KH570); these silane coupling agents have good water resistance and chemical resistance, can effectively improve the bonding effect between organic and inorganic materials, can improve the curing after curing, and accelerate the resistance of the insulation repair glue to salt spray corrosion and pollution problems.

[0057] Preferably, the inorganic filler includes aluminum oxide, silicon oxide, a 1:1 mixture of aluminum hydroxide and magnesium oxide, hollow glass microspheres and boron nitride; these materials have good insulation properties to improve the insulation properties of the insulation repair adhesive after curing. The particle size of the hollow glass microspheres is at the submicron to micron level, making it easy to mix with other materials to form a composite material. Due to the hollow structure, it has good insulation properties and a relatively low density.

[0058] Preferably, the curing agent includes a polyamide resin curing agent, a polyamide-amine type curing agent and a bio-based curing agent; these curing agents have the characteristics of fast curing of epoxy resin.

[0059] Preferably, the solvent includes a water-based solvent, a 1:1 mixed solvent of xylene and ethyl acetate, a dimethylformamide solvent and a butyl acetate solvent; since the main component of the water-based solvent is water, the VOC (volatile organic compound) emission of the water-based solvent is low and meets environmental protection requirements; xylene and ethyl acetate are both organic solvents with good volatility to ensure rapid solidification of the fluid adhesive.

[0060] Preferably, when drawing the glass fiber as one of the warp and weft, soft magnetic powder dust is sprayed to the molten glass fiber through a nozzle in a molten state, and the molten glass fiber is bonded with soft magnetic powder, and the particle size of the soft magnetic powder is 50-200nm; when drawing the other glass fiber as the warp and weft, graphite powder dust is sprayed to the molten glass fiber through a nozzle in a molten state, and the molten glass fiber is bonded with graphite powder, and the particles of the graphite powder are 6-10μm. The glass fiber is bonded with soft magnetic powder. The soft magnetic powder has soft magnetic properties, and can introduce the magnetic field into the deep of the fluid glue to form a relatively uniform magnetic field distribution in the fluid glue, thereby making the fluid glue with conductive properties relatively uniformly heated. The 50-200nm soft magnetic powder can form a more uniform dispersion in the glass fiber to enhance the magnetic properties. At this fine particle size, soft magnetic powder can improve the electromagnetic properties of the material and reduce losses, while providing better interaction and adhesion. 6-10μm graphite dust is relatively small and easy to disperse. After the fluid glue is cured, it is easy to disconnect the electrical contact to ensure the insulation performance of the insulation repair glue.

[0061] 0.7%-1% of a cross-linking agent is added to the fluid adhesive; the cross-linking agent is one of phthalic anhydride or pentylphthalic anhydride.

[0062] Furthermore, the fluid glue is assisted in curing by an auxiliary curing device, which includes an electromagnet, an oscillating circuit connected to the electromagnet to generate a magnetic field with periodic direction changes, and the electromagnet is close to the fluid glue coating position; the soft magnetic powder on the glass fiber can vibrate in the alternating magnetic field to expel the air in the fluid glue; the vibration also promotes the fit between the glass fiber and the fluid glue, and the glass fiber mesh 1 has graphite powder and the fluid glue evenly mixed to form a conductive fluid.

[0063] The auxiliary curing equipment includes a microwave heating device, which generates an alternating magnetic field, and the fluid glue is heated and cured by the microwave heating device; the soft magnetic powder on the glass fiber has soft magnetic properties, which can introduce the magnetic field deep into the fluid glue, forming a relatively uniform magnetic field distribution in the fluid glue, thereby making the fluid glue with conductive properties heat relatively evenly.

[0064] The preparation method of the curing accelerated insulation repair adhesive comprises the following specific preparation steps: (a) epoxy resin, silane coupling agent, inorganic filler, and doped glass fiber mesh 1 in a fragmented form are uniformly mixed in a reaction kettle according to a proportion, and the reaction kettle is vacuumized before mixing;

[0065] (b) adding a curing agent to the reaction kettle and stirring thoroughly to allow all components to react fully;

[0066] (c) adding solvent to the reaction kettle to adjust the viscosity of the coating to a state suitable for construction;

[0067] (d) transferring the treated fluid glue to another reaction kettle, adding a crosslinking agent thereto, stirring evenly, and then performing a vacuum treatment again to remove gas impurities that may be generated during the reaction;

[0068] (e) uniformly coating the prepared coating on the surface of the insulating part to be repaired;

[0069] (f) Curing under heating conditions to form a dense insulating protective layer.

[0070] In step (a), epoxy resin, silane coupling agent, inorganic filler in a specific ratio and glass fiber mesh 1 in a doped shape are uniformly mixed in a reactor, and the reactor is vacuumed before mixing to ensure the purity of the reaction environment. Subsequently, the base material is heated to a suitable reaction temperature. While heating, stirring is continued to ensure that the base material is evenly heated and fully mixed. Through this series of operations, impurities in the base material can be effectively removed, and the purity and quality of the product can be improved.

[0071] In step (b) and step (c), the curing agent is slowly added under negative pressure, and stirring is continued until it is completely dissolved to avoid the generation of bubbles. Subsequently, a solvent is added to adjust the viscosity, and the volatilization of harmful gases is strictly controlled throughout the process. An electromagnetic induction heating furnace is also provided for heating the fluid glue in the reactor; the electromagnetic induction heating furnace has an automatic temperature control system, and the automatic temperature control system has a microprocessor system; the soft magnetic powder on the glass fiber mesh 1 has soft magnetic properties, and the magnetic field can be introduced into the depth of the fluid glue to form a relatively uniform magnetic field distributed in the fluid glue, thereby making the fluid glue with conductive properties relatively uniformly heated; a temperature sensor is also provided in the reactor, and the temperature sensor is connected to the microprocessor system; the electromagnetic induction heating furnace is opened to high power operation below 80 degrees Celsius in the reactor; the electromagnetic induction heating furnace is opened to medium power operation above 80 degrees Celsius in the reactor, and the medium power is 50%-70% of the high power value; the electromagnetic induction heating furnace is opened to low power operation above 150 degrees Celsius in the reactor, and the low power is 20%-30% of the high power value. Because the specially designed glass fiber mesh 1 of the present invention is used, the induction heat can be more evenly distributed inside the fluid glue, avoiding the problem of local flash evaporation caused by local overheating. At the same time, the staged heating power control is set according to the temperature, ensuring the heating efficiency while avoiding flash evaporation.

[0072] Step (d) In order to prevent the product from being affected by oxygen and moisture during storage and use, it is necessary to fill another reaction kettle with a protective gas, such as nitrogen or argon. The filling of the protective gas can effectively isolate harmful gases in the external environment, ensure the stability of the product and extend its shelf life. After the protective gas is filled, continue stirring to fully mix the protective gas with the base material to achieve a uniform distribution effect.

[0073] The fluid glue in step (f) is assisted in curing by an auxiliary curing device, the electromagnet is close to the fluid glue coating position, the soft magnetic powder on the glass fiber can vibrate in the alternating magnetic field to expel the air in the fluid glue; the vibration also promotes the tightness of the glass fiber and the fluid glue, the glass fiber mesh 1 has graphite powder and the fluid glue uniformly mixed to form a conductive fluid, and the microwave heating device generates an alternating magnetic field to heat the conductive fluid. Under the heating condition, the crosslinking agent can react with the functional groups in the epoxy resin through a thermal reaction to form a crosslinking structure, quickly cure the epoxy resin base material, thereby forming a stronger insulating layer, and the cured structure can reduce the electrical contact between the graphite powders. Inorganic fillers with stronger insulation properties (such as aluminum oxide, silicon oxide, hollow glass microspheres, boron nitride or a 1:1 mixture of aluminum hydroxide and magnesium oxide) are added to epoxy resin to improve the insulation performance of the insulation repair glue after curing. These materials can be used together with graphite powder to cut off the electrical contact of the graphite powder in the fluid after the fluid glue is cured, so that the fluid glue maintains its insulation properties after curing. The volume resistivity can reach more than 10^13Ω·cm, and the dielectric strength can reach more than 20kV / mm.

[0074] Embodiment 1:

[0075] Weigh 100 parts of environmentally friendly epoxy resin, 1 part of non-volatile silane coupling agent KH550, 50 parts of environmentally friendly alumina inorganic filler, 5 parts of low-VOC polyamide resin curing agent, and a water-based solvent doped with 1 glass fiber mesh.

[0076] Mixing and stirring: Add epoxy resin, silane coupling agent and inorganic filler into the reaction kettle, control the temperature between room temperature and 40°C, stir at a moderate speed to ensure that the components are initially mixed evenly.

[0077] Adding curing agent and solvent: In the reaction kettle, slowly add the polyamide resin curing agent under negative pressure, continue stirring until it is completely dissolved, and avoid the generation of bubbles. Then, add a water-based solvent to adjust the viscosity.

[0078] During the stirring process, the electromagnetic induction heating furnace uses electromagnetic induction heating of the glass fiber mesh to make the induction heat more evenly distributed inside the fluid glue, avoiding the problem of local overheating and local flash evaporation. At the same time, the staged heating power control is set according to the temperature, which ensures the heating efficiency and avoids flash evaporation under the premise of avoiding flash evaporation.

[0079] Coating and curing: The prepared repair glue is evenly coated on the surface of the insulating part to be repaired. A microwave heating device is used to form a strong magnetic field distribution around the interwoven graphite powder bonded to the glass fiber, thereby generating induction heat, uniformly heating the fluid glue to achieve rapid curing, and the water-based solvent evaporates quickly, and the curing agent reacts with the epoxy resin, thereby achieving rapid curing and reducing the impact on the environment.

[0080] The water-based solvent evaporates quickly, and the curing agent reacts with the epoxy resin to achieve rapid curing. Water-based solvents reduce VOC emissions, reduce the impact on the environment, and reduce the impact on the environment.

[0081] Embodiment 2:

[0082] 80 parts of epoxy resin, 0.8 parts of silane coupling agent KH570, 60 parts of silica inorganic filler, 6 parts of modified polyamide curing agent, 15 parts of butyl acetate solvent and 1 part of glass fiber mesh are used.

[0083] Mixing and stirring: Add epoxy resin, silane coupling agent and inorganic filler into the reaction kettle, control the temperature between room temperature and 40°C, stir at a moderate speed to ensure that the components are initially mixed evenly.

[0084] Adding curing agent and solvent: In the reaction kettle, slowly add the modified polyamide curing agent under negative pressure, continue stirring until it is completely dissolved, and avoid the generation of bubbles. Then, add butyl acetate to adjust the viscosity.

[0085] During the stirring process, the electromagnetic induction heating furnace uses electromagnetic induction heating of the glass fiber mesh to make the induction heat more evenly distributed inside the fluid glue, avoiding the problem of local overheating and local flash evaporation. At the same time, the staged heating power control is set according to the temperature, which ensures the heating efficiency and avoids flash evaporation under the premise of avoiding flash evaporation.

[0086] Coating and curing: The prepared repair glue is evenly coated on the surface of the insulating part to be repaired. A strong magnetic field distribution is formed around the glass fiber by a microwave heating device, which generates induction heat and evenly heats the fluid glue. The butyl acetate solvent evaporates quickly, and the curing agent reacts with the epoxy resin, thereby achieving rapid curing of the fluid glue.

[0087] Butyl acetate is more volatile, but its odor is relatively good and is suitable for indoor applications. However, proper ventilation and personal protection should still be observed.

[0088] Embodiment 3:

[0089] 90 parts of epoxy resin, 1.5 parts of a mixture of silane coupling agents KH330 and KH550 (1:1 ratio), 30 parts of hollow glass microsphere functional filler, 4 parts of polyamide-amine type curing agent, 25 parts of dimethylformamide solvent, and 1 glass fiber mesh were used.

[0090] Mixing and stirring: Add epoxy resin, silane coupling agent and inorganic filler into the reaction kettle, control the temperature between room temperature and 40°C, stir at a moderate speed to ensure that the components are initially mixed evenly.

[0091] Adding curing agent and solvent: In the reaction kettle, slowly add polyamide-amine curing agent under negative pressure, continue stirring until completely dissolved, and avoid the generation of bubbles. Then, add dimethylformamide solvent to adjust the viscosity.

[0092] During the stirring process, the electromagnetic induction heating furnace uses electromagnetic induction heating of the glass fiber mesh to make the induction heat more evenly distributed inside the fluid glue, avoiding the problem of local overheating and local flash evaporation. At the same time, the staged heating power control is set according to the temperature, which ensures the heating efficiency and avoids flash evaporation under the premise of avoiding flash evaporation.

[0093] The treated fluid glue is transferred to another reaction kettle, a cross-linking agent is added thereto, and after being stirred evenly, vacuum treatment is performed again to remove gas impurities that may be generated during the reaction.

[0094] Coating and curing: The prepared repair glue is evenly coated on the surface of the insulating part to be repaired. A microwave heating device is used to form a strong magnetic field distribution around the interwoven graphite powder and the glass fiber, thereby generating induction heat, uniformly heating the fluid glue, and the dimethylformamide solvent evaporates quickly. The curing agent reacts with the epoxy resin, thereby achieving rapid curing of the fluid glue.

[0095] Although dimethylformamide has good solubility, it is toxic and irritating to a certain extent. When using it, make sure to wear appropriate protective equipment and operate in a well-ventilated environment.

[0096] Embodiment 4:

[0097] 110 parts of epoxy resin, 1.2 parts of silane coupling agent KH560, 40 parts of boron nitride thermal conductive filler, 7 parts of low-viscosity polyamide curing agent, 30 parts of mixed solvent (xylene and ethyl acetate 1:1) and 1 glass fiber mesh are also doped.

[0098] Adding curing agent and solvent: In the reactor, slowly add low-viscosity polyamide curing agent under negative pressure, and continue stirring until it is completely dissolved to avoid bubbles. Use a two-stage stirring method, first stir at a low speed to evenly disperse the filler, and then stir at a high speed to promote the full reaction of the curing agent and the resin. Subsequently, add xylene and ethyl acetate solvents to adjust the viscosity, and strictly control the volatilization of harmful gases during the whole process.

[0099] During the stirring process, the electromagnetic induction heating furnace uses electromagnetic induction heating of the glass fiber mesh to make the induction heat more evenly distributed inside the fluid glue, avoiding the problem of local overheating and local flash evaporation. At the same time, the staged heating power control is set according to the temperature, which ensures the heating efficiency and avoids flash evaporation under the premise of avoiding flash evaporation.

[0100] The treated fluid glue is transferred to another reaction kettle, a cross-linking agent is added thereto, and after being stirred evenly, vacuum treatment is performed again to remove gas impurities that may be generated during the reaction.

[0101] Coating and curing: The prepared repair glue is evenly coated on the surface of the insulating part to be repaired. A microwave heating device is used to form a strong magnetic field distribution around the interwoven graphite powder bonded to the glass fiber, thereby generating induction heat, uniformly heating the fluid glue, and the 1:1 mixed solvent of xylene and ethyl acetate evaporates quickly, and the curing agent reacts with the epoxy resin, thereby achieving rapid curing of the fluid glue.

[0102] The full reaction of the curing agent and the resin under high-speed stirring can effectively improve the strength of the curing accelerated insulation repair adhesive.

[0103] Although xylene and ethyl acetate have strong dissolving ability, they are also toxic and irritating to a certain extent. When using them, make sure to wear appropriate protective equipment and operate in a well-ventilated environment.

[0104] Embodiment 5:

[0105] 100 parts of epoxy resin, 1 part of environmentally friendly silane coupling agent γ-glycidyloxypropyltrimethoxysilane, 50 parts of composite inorganic filler (aluminum hydroxide and magnesium oxide mixed in a ratio of 1:1), 3 parts of bio-based curing agent (such as phytic acid), and the water-based solvent system is also doped with 1 glass fiber mesh.

[0106] Adding curing agent and solvent: In the reactor, slowly add the bio-based curing agent under negative pressure. The bio-based curing agent has a polyhydroxy structure and can react chemically with materials such as epoxy resin to form a stable curing network. Continue stirring until it is completely dissolved to avoid bubbles. Then, add a water-based solvent to adjust the viscosity.

[0107] Temperature control: During the stirring process, the electromagnetic induction heating furnace uses electromagnetic induction heating of the glass fiber mesh to make the induction heat more evenly distributed inside the fluid glue, avoiding the problem of local overheating and local flash evaporation. At the same time, the staged heating power control is set according to the temperature, which ensures the heating efficiency and avoids flash evaporation under the premise of avoiding flash evaporation.

[0108] The treated fluid glue is transferred to another reaction kettle, a cross-linking agent is added thereto, and after being stirred evenly, vacuum treatment is performed again to remove gas impurities that may be generated during the reaction.

[0109] Coating and curing: The prepared repair glue is evenly coated on the surface of the insulation to be repaired. A microwave heating device is used to form a strong magnetic field distribution around the interwoven graphite powder and the glass fiber, thereby generating induction heat and evenly heating the fluid glue. The water-based solvent can evaporate quickly, and then the curing agent reacts with the epoxy resin to achieve rapid curing.

[0110] The use of water-based solvents can reduce VOC emissions and the impact on the environment. Bio-based curing agents are more environmentally friendly and suitable for places with high environmental protection requirements.

[0111] Different formulas and preparation processes of the rapid insulation repair adhesive of the present invention are demonstrated, which not only verify the feasibility and effectiveness of the present invention, but also demonstrate its adaptability and flexibility in different application scenarios. The curing accelerated insulation repair adhesive is corrosion-resistant, high-strength, and easy to use.

[0112] Importantly, it should be noted that the construction and arrangement of the present application shown in a number of different exemplary embodiments are only exemplary. Although only a few embodiments are described in detail in this disclosure, it should be readily understood by those who refer to this disclosure that many modifications are possible, for example, the size, scale, structure, shape and proportion of various elements, and parameter values ​​such as temperature, pressure, etc., mounting arrangements, use of materials, color, directional changes, etc., without substantially departing from the novel angles and advantages of the subject matter described in the application. For example, the element shown as integrally formed can be composed of multiple parts or elements, the position of the element can be inverted or otherwise changed, and the nature or number or position of the discrete element can be changed or changed. Therefore, all such modifications are intended to be included in the scope of the present invention. The order or sequence of any process or method steps can be changed or reordered according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure of the execution function described herein, and is not only structurally equivalent but also equivalent structure. Without departing from the scope of the present invention, other substitutions, modifications, changes and omissions can be made in the design, operating conditions and arrangement of the exemplary embodiments. Therefore, the invention is not limited to a specific embodiment, but extends to numerous modifications still falling within the scope of the appended claims.

[0113] Furthermore, in order to provide a concise description of exemplary embodiments, all features of the actual embodiment may not be described, namely those features that are not relevant to the best mode presently contemplated for carrying out the invention or those features that are not relevant to implementing the invention.

[0114] It should be understood that in the development of any actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort may be complex and time-consuming, but for those of ordinary skill having the benefit of this disclosure, the development effort will be a routine task of design, fabrication, and production without undue experimentation.

[0115] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. Curing accelerated insulation repair adhesive, characterized by: It includes epoxy resin base material, silane coupling agent, inorganic filler, curing agent, solvent, and is also doped with glass fiber mesh in a fragmented form, with the glass fiber mesh in a fragmented form as filler, and mixed into a fluid glue; Among them, by weight percentage, epoxy resin base material 50%-58%, silane coupling agent 0.7%-0.8%, inorganic filler 22%-28%, curing agent 0.02%-0.03%, solvent 1%-1.5%; The glass fiber mesh comprises a mesh body and expanded glass fibers; The net body is woven with warp and weft; Both the warp and weft threads are made of fiberglass; The lengths of at least part of the warp threads and at least part of the weft threads are beyond the mesh body to form expanded glass fibers; The diameter of glass fiber is 6.2-9.5 μm; The area of ​​the mesh is 0.55-2.5mm 2 , mesh area is 0.01-0.18mm 2 ; The length of the expanded glass fiber is 0.45-1.95mm; Measured by volume, there are 3-6 glass fiber meshes per cubic centimeter.

2. The curing accelerated insulation repair adhesive according to claim 1, characterized in that: The silane coupling agent includes γ-aminopropyltriethoxysilane, γ-vinyltriethoxysilane and γ-glycidoxypropyltrimethoxysilane.

3. The curing accelerated insulation repair adhesive according to claim 1, characterized in that: The inorganic filler includes aluminum oxide, silicon oxide, a 1:1 mixture of aluminum hydroxide and magnesium oxide, hollow glass microspheres and boron nitride.

4. The curing accelerated insulation repair adhesive according to claim 1, characterized in that: The curing agent includes a polyamide resin curing agent, a polyamide-amine type curing agent and a bio-based curing agent.

5. The curing accelerated insulation repair adhesive according to claim 1, characterized in that: The solvents include a water-based solvent, a 1:1 mixed solvent of xylene and ethyl acetate, a dimethylformamide solvent, and butyl acetate.

6. The curing accelerated insulation repair adhesive according to claim 1, characterized in that: When drawing the glass fiber used as one of the warp and weft threads, soft magnetic powder dust is sprayed onto the molten glass fiber through a nozzle in a molten state, and the molten glass fiber is bonded with the soft magnetic powder, and the particle size of the soft magnetic powder is 50-200nm; When drawing the glass fiber, which is another kind of warp and weft, graphite powder dust is sprayed onto the molten glass fiber through a nozzle in a molten state, and the molten glass fiber is bonded with the graphite powder, and the particles of the graphite powder are 6-10μm.

7. The curing accelerated insulation repair adhesive according to claim 6, characterized in that: Add 0.7%-1% crosslinking agent to the fluid glue; The cross-linking agent is either phthalic anhydride or pentylphthalic anhydride.

8. The curing accelerated insulation repair adhesive according to claim 7, characterized in that: The fluid glue is assisted in curing by an auxiliary curing device, which includes an electromagnet. An oscillating circuit is connected to the electromagnet to generate a magnetic field with periodic direction changes. The electromagnet is close to the fluid glue coating position. The soft magnetic powder on the glass fiber can vibrate in the alternating magnetic field to expel the air in the fluid glue. The vibration also promotes the tightness of the glass fiber and the fluid glue. The glass fiber mesh has graphite powder mixed with the fluid glue to form a conductive fluid.

9. The curing accelerated insulation repair adhesive according to claim 8, characterized in that: The auxiliary curing equipment includes a microwave heating device, and the fluid glue is heated and cured by the microwave heating device; Glass fiber bonded with soft magnetic powder guides the magnetic field generated by the microwave heating device into the deep of the fluid glue; In addition, the interwoven and bonded graphite powder forms a strong magnetic field distribution around the glass fiber, thereby generating induction heat.

10. The curing accelerated insulation repair adhesive according to claim 1, characterized in that: The invention discloses a method for preparing a curing accelerated insulation repair adhesive, wherein the specific preparation steps are as follows: (a) epoxy resin, silane coupling agent, inorganic filler, and glass fiber mesh in a doped state are uniformly mixed in a reaction kettle according to a certain proportion, and the reaction kettle is vacuumized before mixing; (b) adding a curing agent to the reaction kettle and stirring thoroughly to allow all components to react fully; (c) adding solvent to the reaction kettle to adjust the viscosity of the coating; (d) transferring the treated fluid glue to another reaction kettle, adding a crosslinking agent thereto, stirring evenly, and then performing a vacuum treatment again to remove gas impurities that may be generated during the reaction; (e) uniformly coating the prepared coating on the surface of the insulating part to be repaired; (f) Curing under heating conditions to form a dense insulating protective layer.

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