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High heat conductive insulating impregnated resin used for air reactor and preparation method thereof

An air-core reactor, insulation impregnation technology, applied in the direction of organic insulators, plastic/resin/wax insulators, coil manufacturing, etc., can solve the problems of low thermal conductivity of cured products, high coil temperature, low thermal conductivity, etc., to achieve the preparation method Simplicity, low production cost, high thermal conductivity effect

Inactive Publication Date: 2010-10-20
桂林五环电器制造有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the impregnating resin used in the manufacture of air-core reactors is mainly prepared by mixing epoxy resin, curing agent, curing accelerator and other components. The thermal conductivity of the cured product is low, only 0.16-0.18W / (m·K) , is not conducive to the heat dissipation of the reactor coil
Due to the low thermal conductivity of the impregnated resin cured product, the heat generated inside the coil cannot be dissipated in time when the reactor is running, resulting in an excessively high temperature rise of the coil, which may lead to overheating of the reactor coil and shorten the service life of the reactor; Directly cause accidents such as reactor coil burnout, which seriously affects the operation reliability of the power grid

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 1. The formula of impregnating resin

[0030] Epoxy resin: CYD128 epoxy resin 100kg;

[0031] Toughening agent: polyoxypropylene glycol 9.5kg;

[0032] Curing agent: methyl tetrahydrophthalic anhydride 80kg;

[0033] Curing accelerator: DMP-30 0.5kg;

[0034] Inorganic powder: 125kg of 400-mesh active silica powder.

[0035] 2. Preparation method

[0036] In a 300L stirring tank, add epoxy resin, curing agent and toughening agent in sequence, start stirring, and heat up. When the temperature of the material rises to 60°C, add inorganic powder, stir evenly, and then defoam at 65°C and 0.3kPa. Until no bubbles are released; then lower the temperature to 40°C, release the vacuum, add a curing accelerator, stir evenly, filter, and discharge to obtain.

[0037] After the impregnating resin prepared above was cured at 150°C for 5 hours, the thermal conductivity of the cured product was 0.42W / (m·K), and the density was 1.70g / cm 3 , the impact strength is 23kJ / m 2 , The ...

Embodiment 2

[0039] 1. The formula of impregnating resin

[0040] Epoxy resin: E-54 epoxy resin 100kg;

[0041] Toughening agent: polyoxypropylene glycol 9.5kg;

[0042] Curing agent: methyl tetrahydrophthalic anhydride 80kg;

[0043] Curing accelerator: DMP-30 0.5kg;

[0044] Inorganic powder: 325 mesh aluminum oxide powder 180kg.

[0045] 2. Preparation method

[0046] In a 300L stirred tank, add epoxy resin, curing agent and toughening agent in sequence, start stirring, heat up, put in inorganic powder when the temperature of the material rises to 60°C, stir evenly and then defoam at 70°C and 0.25kPa Until no bubbles are released; then lower the temperature to 50°C, release the vacuum, add a curing accelerator, stir evenly, filter, and discharge to obtain.

[0047] After the impregnating resin prepared above was cured at 150°C for 5 hours, the thermal conductivity of the cured product was 0.70W / (m·K), and the density was 2.21g / cm 3 , the impact strength is 18kJ / m 2 , The bending ...

Embodiment 3

[0049] 1. The formula of impregnating resin

[0050] Epoxy resin: CER-170 cycloaliphatic epoxy resin 100kg;

[0051] Toughening agent: polytetrahydrofuran diol 9.5kg;

[0052] Curing agent: methyl hexahydrophthalic anhydride 90kg;

[0053] Curing accelerator: N, N'-dimethylbenzylamine 0.5kg;

[0054] Inorganic powder: 200kg of 325 mesh aluminum oxide powder.

[0055] 2. Preparation method

[0056] In a 300L stirring tank, add epoxy resin, curing agent and toughening agent in sequence, start stirring, heat up, put in inorganic powder when the temperature of the material rises to 60°C, stir evenly and then defoam at 60°C and 0.4kPa Until no bubbles are released; then lower the temperature to 46°C, release the vacuum, add a curing accelerator, stir evenly, filter, and discharge to obtain.

[0057] After the impregnating resin prepared above was cured at 150°C for 5 hours, the thermal conductivity of the cured product was 0.70W / (m·K), and the density was 2.45g / cm 3 , the imp...

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Abstract

The invention discloses a high heat conductive insulating impregnated resin used for an air reactor and a preparation method thereof. The impregnated resin comprises the following components in parts by weight: 100 parts of epoxy resin, 5-25 parts of flexibilizer, 75-100 parts of curing agent, 0.30-0.80 part of curing accelerator and 85-300 parts of inorganic powder, wherein the inorganic powder is selected form one or more than two of silica micropowder, aluminium oxide powder and sericite powder. The preparation method comprises the following steps: sequentially feeding the epoxy resin, the curing agent and the flexibilizer into a kettle and stirring; feeding the inorganic powder while heating to 50-60 DEG C, evenly stirring, and carrying out decompression and defoaming at the temperature of 60-75 DEG C until no air bubble is released; and while cooling to 40-50 DEG C, carrying out vacuum release, adding the curing accelerator, and evenly stirring to obtain the solvent impregnated resin. Compared with the prior art, the solvent impregnated resin preparation method of the invention is simple, the production cost is low, the obtained impregnated resin has high coefficient of heat conductivity, and the temperature rise of the reactor is low.

Description

technical field [0001] The invention relates to an impregnating resin, in particular to an impregnating resin with high thermal conductivity and insulation for an air-core reactor; the invention also relates to a preparation method of the impregnating resin. Background technique [0002] For air-core reactors currently used in power systems, the coils can be wound with glass fibers and wires and then impregnated with paint, or they can be wound with glass fibers, wires, and impregnated resins together by on-site wet method, but no matter what method is used for winding, Both need to fill the air gap existing inside the coil with resin, and then solidify and form a whole. The glass fiber acts as a reinforcement in the reactor coil, and the resin plays the roles of filling the air gap, heat transfer, moisture-proof, and partial discharge prevention in the reactor coil. [0003] At present, the impregnating resin used in the manufacture of air-core reactors is mainly prepared ...

Claims

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Application Information

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IPC IPC(8): C08L63/00C08L63/02C08L71/02C08K3/34C08K3/22H01B3/40C03C25/16C03C25/42H01F41/12
Inventor 饶保林赵跃陈鑫臣李子健
Owner 桂林五环电器制造有限公司
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