Manufacturing process of self-curing insulating material and construction method for insulating protection of fan equipment

Abstract

The invention discloses a manufacturing process of a self-curing insulating material and a construction method for insulation protection of fan equipment, and the manufacturing process comprises the following steps: preparing a catalytic cross-linking agent from a chelate and a cross-linking agent in a heating polymerization manner; mixing silane with aluminum hydroxide to prepare a mixture of silicon dioxide and silane; and preparing the insulating material from the catalytic cross-linking agent and the silane mixture. The insulating material has a semi-solid state, so that the problem of complex outer surface shape characteristics of an electrified conductor is solved, complete wrapping is realized, meanwhile, the material also has a proper insulation grade and a relatively small thickness, can be tightly attached to the surface of the conductor to form a sealed insulating system, and can realize complete fusion sealing; and accumulation and erosion of water vapor and condensation on the surface of the conductor can be completely eradicated.

Description

Technical Field

[0001] The invention relates to insulating materials, in particular to a self-curing insulating material manufacturing process and a construction method for insulating and protecting fan equipment. Background Art

[0002] For high-voltage electrical components of fans, when the air humidity is too high, a primary oxide film will form on the exposed busbars, resulting in insufficient contact area for the equipment and causing adverse effects. Currently, the copper foil insulation materials and insulation performance of fans and box-type transformers have the following defects:

[0003] Since the electrical equipment of wind turbines has been connected to the grid for power generation, the equipment has been working in a relatively harsh environment, which has led to insulation failure of the electrical equipment and the surrounding electrical appliances and other charged bodies, accelerated the natural aging of their original insulation layers or insulating shells, and caused the electrical equipment or charged bodies to discharge to the ground or to the ground of the shell, and even caused mutual discharge between phases, causing irreversible destructive damage to the equipment or personal injury to personnel.

[0004] When insulation materials fail, electrical equipment or charged parts will quickly generate high-temperature arcs when they discharge to the ground or between phases. This can cause high-temperature fires in the equipment or charged parts, leading to burns. Worse still, insulation failure can cause irreversible damage to fan inverter cabinets, grid-connected cabinets, and the high and low voltage sides of box-type transformers, or even personal injuries.

[0005] The siting conditions of wind turbines are generally characterized by a large temperature difference between day and night. In such an environment, the temperature difference between day and night will cause condensation in the electrical equipment cabinet, and the generation of condensation will inevitably produce water droplets. The moisture and condensation in the cabinet will adhere to the charged body and will naturally flow along the conductor, causing the electrical equipment or charged body to discharge to the ground or between phases due to the dripping of water droplets, resulting in irreversible destructive damage to the equipment or personal injury to personnel.

[0006] The internal space of the wind turbine electrical equipment is small and the structure is complex. The busbars are stacked and interactive. There are a large number of irregular surfaces and metal joints on the busbars, forming many irregular live surfaces. The use of conventional insulating materials cannot achieve close fit and sealing protection with the metal busbar surface, resulting in the inability to implement an insulation system for the live conductors. Summary of the Invention

[0007] Therefore, the technical problem to be solved by the present invention is: the problem of insulating materials.

[0008] The above technical problems are solved by the following technical solutions: The present invention proposes a self-regulating water surface photovoltaic power generation device, comprising:

[0009] The chelate and the cross-linking agent are polymerized by heating to prepare a catalytic cross-linking agent;

[0010] mixing silane with aluminum hydroxide to prepare a silica and silane mixture;

[0011] A mixture of a catalytic cross-linking agent and silane is prepared into an insulating material.

[0012] In a preferred embodiment of the process for manufacturing the self-curing insulating material of the present invention: the chelate is a tin chelate;

[0013] The tin chelate is prepared by ligand exchange between dibutyltin dilaurate and acetylacetone, and the ratio of acetylacetone to dibutyltin dilaurate is greater than 2:1.

[0014] In a preferred embodiment of the self-curing insulating material manufacturing process of the present invention, the silane is prepared by hydrolysis condensation and aminolysis reaction of polydimethylsiloxane, methyltrimethoxysilane, and hexamethyldisilazane.

[0015] In a preferred embodiment of the self-curing insulating material manufacturing process of the present invention: the molar ratio of the polydimethylsiloxane, methyltrimethoxysilane, and hexamethyldisilazane is A:B:C;

[0016] The value of A is 1, the value of B is 0.5 to 1, and the value of C is 0.1 to 0.3.

[0017] In a preferred embodiment of the process for manufacturing the self-curing insulating material of the present invention: when the catalytic cross-linking agent and the silane mixture are made into the insulating material, the catalytic cross-linking agent and the silane mixture are blended and extruded through a twin-screw extruder;

[0018] The screw speed of the twin-screw extruder is 50-100 rpm.

[0019] In a preferred embodiment of the process for manufacturing the self-curing insulating material of the present invention, the catalytic cross-linking agent and the silane mixture are pre-mixed before the co-extrusion process.

[0020] In a preferred embodiment of the self-curing insulating material manufacturing process of the present invention: the feeding section temperature of the twin-screw extruder is 80-100°C.

[0021] The melting zone temperature of the twin-screw extruder is 120-150°C.

[0022] In a preferred embodiment of the self-curing insulating material manufacturing process of the present invention: the ligand exchange adopts a reflux dehydration method;

[0023] In the reflux dehydration method, toluene is used as the solvent.

[0024] In a preferred embodiment of the self-curing insulating material manufacturing process of the present invention, the specific steps of hydrolysis condensation and aminolysis reaction of polydimethylsiloxane, methyltrimethoxysilane, and hexamethyldisilazane are as follows:

[0025] Mixing polydimethylsiloxane and methyltrimethoxysilane in a container to obtain a polydimethylsiloxane and methyltrimethoxysilane mixture;

[0026] Add hexamethyldisilazane to the container of the polydimethylsiloxane and methyltrimethoxysilane mixture;

[0027] Add deionized water 3 times the molar amount of methyltrimethoxysilane;

[0028] Stir at room temperature for 2-4 hours.

[0029] The present invention also provides a construction method for insulation protection of wind turbine equipment, comprising slicing the product of the above-mentioned self-curing insulation material manufacturing process;

[0030] Wrap the slices around the outside of the conductor of the fan electrical equipment.

[0031] The beneficial effects of the present invention are as follows: because the insulating material is semi-solid, it solves the complex outer surface shape characteristics of the live conductor and achieves complete wrapping. At the same time, this material also has an appropriate insulation level and a small thickness, and can be tightly attached to the surface of the conductor to form a sealed insulation system. The material can achieve complete fusion and sealing, and can completely prevent the accumulation and erosion of water vapor and condensation on the surface of the conductor. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings of the embodiments of the present invention. Obviously, the drawings described below only relate to some embodiments of the present invention and are not intended to limit the present invention. Among them:

[0033] Figure 1 A process flow chart of the self-curing insulation material manufacturing process is shown; DETAILED DESCRIPTION

[0034] In order to enable those skilled in the art to better understand the present invention, the present invention is further described in detail below with reference to specific embodiments and the accompanying drawings.

[0035] The terms used in the present invention are those commonly used in the art in view of the functions of the present invention, but these terms may vary according to the intentions of those skilled in the art, precedents, or new technologies in the art. In addition, specific terms may be selected by the applicant, and in such cases, their detailed meanings will be described in the detailed description of the present invention. Therefore, the terms used in the specification should not be understood as simple names, but rather as the meanings of the terms and the overall description of the present invention.

[0036] This embodiment provides a self-curing insulating material manufacturing process, including:

[0037] S1: preparing a catalytic crosslinking agent by polymerizing the chelate and the crosslinking agent by heating;

[0038] The chelate is a tin chelate; the crosslinker is tetraethyl orthosilicate. The tin chelate (such as dibutyltin dilaurate DBTDL, stannous octoate) activates the silanol group (-Si-OH) or alkoxy group (-OR) by providing an empty orbital, accelerating the condensation reaction. The tetraethyl orthosilicate hydrolyzes to form silanol (Si-OH) and ethanol. The tin chelate acts as a catalyst to promote the dehydration condensation (-Si-O-Si-) between the silanols, forming a three-dimensional network structure. The reaction formula is:

[0039] R3Si-OH+HO-SiR3→R3Si-O-SiR3+H2O

[0040] During the reaction, ethyl orthosilicate plays two roles. One is as a cross-linking agent. The silanol groups after hydrolysis directly participate in the cross-linking reaction. The other role is as a reinforcing filler. Incompletely hydrolyzed ethyl orthosilicate can generate nano-SiO2 particles in situ to improve the mechanical properties of the material.

[0041] S2: mixing silane with aluminum hydroxide to prepare a silica and silane mixture;

[0042] In step S2, silane, aluminum hydroxide and catalyst are mixed in a high-speed stirrer for 10 to 15 minutes to ensure uniform dispersion. The mixed silane, aluminum hydroxide and catalyst are placed in a high-temperature reactor, and the temperature of the high-temperature reactor is adjusted to 200-300°C to completely cover the decomposition temperature of aluminum hydroxide. The catalyst is dibutyltin dilaurate. After the silane and aluminum hydroxide complete thermal decomposition and hydrolysis in the high-temperature reactor, they are cooled. After cooling, the agglomerated silica and silane mixture is crushed by a crusher.

[0043] S3: preparing an insulating material by mixing a catalytic cross-linking agent with a silane mixture.

[0044] When the catalytic crosslinking agent and the silane mixture are made into an insulating material, the catalytic crosslinking agent and the silane mixture are co-blended and extruded through a twin-screw extruder; the screw speed of the twin-screw extruder is 50-100 rpm; before the co-blending and extrusion process, the catalytic crosslinking agent and the silane mixture are pre-mixed. The pre-mixing can be carried out in a high-speed mixer. The silane base, the catalytic crosslinking agent and the auxiliary agent are mixed in the high-speed mixer for 10 minutes, and then the mixed product is sent into the twin-screw extruder for co-blending and extrusion.

[0045] When the mixed product is fed into the interior of the twin-screw extruder mechanism, the temperature of the feeding section of the twin-screw extruder is 80-100°C, and the temperature of the melting section of the twin-screw extruder is 120-150°C.

[0046] The feeding section temperature and the melting section temperature are two key parameters in the extrusion process, corresponding to the different stages of material conveying and melting and plasticizing respectively.

[0047] The feeding section is the initial area where the material enters the extruder. In order to avoid premature melting of the material before the feed port and ensure that the silane mixture can smoothly enter the screw groove, the feeding section temperature is usually set to 80-100°C, which does not cover the softening point of the silane mixture of 120°C, thereby ensuring that the silane mixture can smoothly enter the screw groove.

[0048] The melting section is located after the feeding section, and the temperature needs to be higher than the melting temperature of the material so that the material can be completely melted in this area. Therefore, the melting section temperature of the twin-screw extruder is 120-150°C, which is 120°C higher than the softening point of the silane mixture. However, the melting section temperature cannot exceed 150°C. Too high a melting section temperature will cause silane decomposition and catalyst deactivation problems.

[0049] In actual manufacturing, gradient heating is adopted, for example, a temperature gradient is set from the feeding section to the melting section (such as 80°C in the feeding section → 100°C in the compression section → 140°C in the melting section) to avoid thermal shock. By reasonably controlling the temperature of the feeding section and the melting section, the material processability, catalyst activity and product quality can be balanced to avoid extrusion instability or performance defects caused by improper temperature.

[0050] Before step S1, a tin chelate is prepared. The tin chelate is prepared by ligand exchange between dibutyltin dilaurate and acetylacetone. The ratio of acetylacetone to dibutyltin dilaurate is greater than 2:1.

[0051] The ligand exchange method adopts the reflux dehydration method, the principle of which is that the butyltin center of dibutyltin dilaurate and two laurates (-OOC(CH2) 10 CH3) coordination, the β-diketone structure of acetylacetone (CH3COCH2COCH3) can be deprotonated to form acetylacetonate (acac - ).

[0052] The role of reflux dehydration is to remove the lauric acid generated by the reaction, separate the low-boiling point lauric acid by distillation, and dehydration inhibits the reverse reaction (ligand hydrolysis) to increase the yield of the chelate.

[0053] In the reflux dehydration method, using toluene as a solvent, the specific steps are:

[0054] Add dibutyltin dilaurate, acetylacetone and toluene to three dry containers respectively, then install a reflux condenser, connect a water separator at the bottom, and install a molecular sieve in the water separator. Then heat it to toluene reflux (about 110°C) and maintain it for 4-6 hours to separate the generated lauric acid.

[0055] Toluene was then removed by distillation under reduced pressure.

[0056] It should be noted that acetylacetone needs to be in excess, that is, the ratio of acetylacetone to dibutyltin dilaurate should be greater than 2:1 to ensure double substitution and avoid the formation of monochelate.

[0057] Before step S2, a silane mixture is prepared. The silane mixture is prepared by hydrolysis condensation and aminolysis reaction of polydimethylsiloxane, methyltrimethoxysilane, and hexamethyldisilazane.

[0058] During preparation, the molar ratio of polydimethylsiloxane, methyltrimethoxysilane, and hexamethyldisilazane is A:B:C; the value of A is 1, the value of B is 0.5-1; the value of C is 0.1-0.3. The amount of methyltrimethoxysilane needs to be controlled, as excessive use will cause the product to become brittle.

[0059] Polydimethylsiloxane provides a flexible silicon-oxygen backbone, giving the product good elasticity. Methyltrimethoxysilane is hydrolyzed to form silanols, which serve as cross-linking sites. The specific preparation principle is: methyltrimethoxysilane is hydrolyzed to form Si(OH)3, which further condenses with the terminal hydroxyl (-OH) or side chain hydroxyl of polydimethylsiloxane to form a -Si-O-Si- cross-linked network. The amino group (-NH-) of methyltrimethoxysilane can react with silanols to form a silicon-nitrogen bond (Si-N), or exchange with unhydrolyzed methoxy groups (-OCH3).

[0060] The specific preparation steps are: polydimethylsiloxane and methyltrimethoxysilane are stirred evenly in a reaction kettle, hexamethyldisilazane is slowly added to avoid violent heat release, and then water is added, deionized water 3 times the molar amount of methyltrimethoxysilane is added, and stirred at room temperature for 2-4 hours.

[0061] Methanol and excess water were then removed by distillation under reduced pressure.

[0062] The present invention also proposes a construction method for insulation protection of wind turbine equipment, comprising slicing the product of the above-mentioned self-curing insulation material manufacturing process; and wrapping the slices around the outside of the conductor of the wind turbine electrical equipment.

[0063] Because of its semi-solid nature, this insulating material addresses the complex outer surface shapes of live conductors, achieving complete encapsulation. Furthermore, it possesses an appropriate insulation grade and a thin thickness, allowing it to adhere tightly to the conductor surface to form a sealed insulation system. The material achieves a complete fusion seal, completely preventing the accumulation and erosion of moisture and condensation on the conductor surface. The insulating material is used to provide insulation protection and seal the copper busbars connecting the wind turbine's box-type transformer to the 690V incoming line terminal of the tower-based inverter, the generator stator to the inverter grid-side terminal, the generator rotor to the generator-side rotor terminal, the upper and lower busbar joints of the box-type transformer's low-voltage side circuit breaker, the low-voltage bushing joints, and the high-voltage side lead joints.

[0064] Finally, it should be pointed out that the methods and devices described in detail above are merely embodiments, and those skilled in the art can modify these embodiments in different ways without departing from the scope of the present invention.

Claims

1. A process for manufacturing a self-curing insulating material, characterized in that: include, The chelate and the cross-linking agent are polymerized by heating to prepare a catalytic cross-linking agent; mixing silane with aluminum hydroxide to prepare a silica and silane mixture; A mixture of a catalytic cross-linking agent and silane is prepared into an insulating material.

2. The process for manufacturing a self-curing insulating material according to claim 1, characterized in that: The chelate is a tin chelate; The tin chelate is prepared by ligand exchange between dibutyltin dilaurate and acetylacetone, and the ratio of acetylacetone to dibutyltin dilaurate is greater than 2:

1.

3. The process for manufacturing a self-curing insulating material according to claim 1 or 2, characterized in that: The silane is prepared by hydrolysis condensation and aminolysis reaction of polydimethylsiloxane, methyltrimethoxysilane and hexamethyldisilazane.

4. The process for manufacturing a self-curing insulating material according to claim 3, wherein: The molar ratio of the polydimethylsiloxane, methyltrimethoxysilane, and hexamethyldisilazane is A:B:C; The value of A is 1, the value of B is 0.5 to 1, and the value of C is 0.1 to 0.

3.

5. The process for manufacturing a self-curing insulating material according to claim 1, wherein: When the catalytic cross-linking agent and the silane mixture are made into an insulating material, the catalytic cross-linking agent and the silane mixture are blended and extruded through a twin-screw extruder; The screw speed of the twin-screw extruder is 50-100 rpm.

6. The process for manufacturing a self-curing insulating material according to claim 5, characterized in that: Before the co-extrusion process, the catalytic crosslinking agent is pre-mixed with the silane mixture.

7. The process for manufacturing a self-curing insulating material according to claim 5, wherein: The feeding section temperature of the twin-screw extruder is 80-100°C. The melting zone temperature of the twin-screw extruder is 120-150°C.

8. The process for manufacturing a self-curing insulating material according to claim 2, wherein: The ligand exchange adopts reflux dehydration method; In the reflux dehydration method, toluene is used as the solvent.

9. The process for manufacturing a self-curing insulating material according to claim 3, wherein: The specific steps of hydrolysis condensation and aminolysis reaction of polydimethylsiloxane, methyltrimethoxysilane and hexamethyldisilazane are as follows: Mixing polydimethylsiloxane and methyltrimethoxysilane in a container to obtain a polydimethylsiloxane and methyltrimethoxysilane mixture; Add hexamethyldisilazane to the container of the polydimethylsiloxane and methyltrimethoxysilane mixture; Add deionized water 3 times the molar amount of methyltrimethoxysilane; Stir at room temperature for 2-4 hours.

10. A construction method for insulation protection of wind turbine equipment, characterized by: The method comprises slicing a product of the self-curing insulating material manufacturing process according to any one of claims 1 to 9; Wrap the slices around the outside of the conductor of the fan electrical equipment.

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