Environment-friendly high-thermal-conductivity insulating paint and preparation method thereof

Abstract

The invention discloses an environment-friendly high-thermal-conductivity insulating paint and a preparation method thereof, and belongs to the technical field of phase-shifting transformer protection, the insulating paint comprises the following dry components by mass: 40%-50% of epoxy modified heat-resistant polyester resin; 15%-20% of boron nitride (or aluminum nitride); 30%-40% of environment-friendly metacrylic acid ester; 1% of an initiator; and 2% of curing agent. Therefore, the phase-shifting transformer is beautiful after being impregnated and cured, the mechanical property is strong, and the insulating protection layer is enhanced.

Description

Technical Field

[0001] The invention relates to the technical field of phase-shifting transformer protection, and in particular to an environmentally friendly high-thermal-conductive insulating varnish and a preparation method thereof. Background Art

[0002] The phase-shifting transformer is a special transformer designed to achieve the construction of a multi-phase rectifier system by adjusting the phase of the secondary winding, thereby reducing the harmonic current on the grid side. The working principle of the phase-shifting transformer mainly involves the secondary winding of the transformer, and the phase shifting is achieved through different wiring methods. This transformer can be used in a variety of scenarios, including but not limited to the input side of high-power inverters and high-power DC power supplies, by increasing the number of pulses of the rectifier, improving the power factor, and reducing pollution to the grid.

[0003] At present, in order to increase the service life of the phase-shifting transformer, the phase-shifting transformer is usually coated with insulating paint by dipping. However, the common insulating paint has the disadvantages of large volatilization amount causing damage to the vacuum equipment, many bubbles inside the insulating paint, and unsatisfactory protective effect when coated by dipping. Summary of the invention

[0004] The object of the present invention is to provide an environmentally friendly high thermal conductivity insulating varnish and a preparation method thereof, so as to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above object, the present invention provides the following technical solution: an environmentally friendly high thermal conductivity insulating varnish, wherein the dry components of the insulating varnish are composed of the following components by mass percentage:

[0006]

[0007] Preferably, the insulating varnish has a viscosity of 500-2000 mPas / 25°C, a gel time of 4-10 min at 120°C, a thermal conductivity of >1.5 W / (mK), a filler content of <20%, an electrical strength of ≥20 mV / m, and a bonding strength of ≥100 N.

[0008] A method for preparing an environmentally friendly high thermal conductivity insulating paint, the specific steps comprising:

[0009] After the phase-shifting transformer is moved into the paint dipping tank, vacuum is drawn to 500 Pa and maintained for 30 minutes;

[0010] Input the insulating paint and continue to perform the continuous vacuuming method, the vacuum is always maintained at 500Pa, and it is maintained for 30 minutes;

[0011] Input positive pressure to 0.3Mpa to allow the insulating varnish to completely penetrate into the coil, maintain pressure for 30 minutes and then release the pressure.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] By continuously vacuuming the insulating paint and keeping the vacuum at 500pa, the volatilization amount is very small. Continuing to vacuum after the paint is delivered will not affect the volatilization of the insulating paint and will not damage the vacuum equipment.

[0014] By inputting positive pressure to 0.3Mpa, the insulating paint can completely penetrate into the interior of the coil, and the pressure is released after maintaining for 30 minutes. This allows the phase-shifting transformer to be immersed in a completely vacuum state, with very few bubbles inside and high permeability of the insulating paint. After impregnation and curing, the phase-shifting transformer is beautiful, has strong mechanical properties, and has an enhanced insulating protective layer. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a flow chart of the preparation method of the present invention. DETAILED DESCRIPTION

[0016] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0017] See also Figure 1 , the present invention provides a technical solution:

[0018] An environmentally friendly high thermal conductivity insulating varnish, wherein the dry components of the insulating varnish are composed of the following components by mass percentage:

[0019]

[0020] Preferably, the insulating varnish has a viscosity of 500-2000 mPas / 25°C, a gel time of 4-10 min at 120°C, a thermal conductivity of >1.5 W / (mK), a filler content of <20%, an electrical strength of ≥20 mV / m, and a bonding strength of ≥100 N.

[0021] Embodiment 1

[0022] An environmentally friendly high thermal conductivity insulating varnish, wherein the dry components of the insulating varnish are composed of the following components by mass percentage:

[0023]

[0024] The insulating varnish using the above-mentioned materials in percentage by mass has the advantages of low content of baking volatiles, high thermal conductivity, low viscosity and good processability.

[0025] Embodiment 2

[0026] An environmentally friendly high thermal conductivity insulating varnish, wherein the dry components of the insulating varnish are composed of the following components by mass percentage:

[0027]

[0028]

[0029] The insulating varnish using the above-mentioned materials in percentage by mass has the advantages of low content of baked volatiles, high thermal conductivity and large paint film thickness.

[0030] Embodiment 3

[0031] An environmentally friendly high thermal conductivity insulating varnish, wherein the dry components of the insulating varnish are composed of the following components by mass percentage:

[0032]

[0033] The insulating varnish using the above-mentioned materials in mass percentage has the advantages of low volatile matter content and high thermal conductivity.

[0034] Embodiment 4

[0035] An environmentally friendly high thermal conductivity insulating varnish, wherein the dry components of the insulating varnish are composed of the following components by mass percentage:

[0036]

[0037] The insulating varnish using the above-mentioned materials in percentage by mass has the advantages of low volatile content, high thermal conductivity, and good paint film adhesion and flexibility.

[0038] Embodiment 5

[0039] An environmentally friendly high thermal conductivity insulating varnish, wherein the dry components of the insulating varnish are composed of the following components by mass percentage:

[0040]

[0041] The insulating varnish using the above-mentioned materials in mass percentage has the advantages of low baking volatile content, high thermal conductivity, large paint film thickness and high hardness.

[0042] like Figure 1 As shown, a method for preparing an environmentally friendly high thermal conductivity insulating paint comprises the following specific steps:

[0043] After the phase-shifting transformer is moved into the paint dipping tank, vacuum is drawn to 500 Pa and maintained for 30 minutes;

[0044] Input the insulating paint and continue to perform the continuous vacuuming method. The vacuum is always maintained at 500Pa and is maintained for 30 minutes. By continuously vacuuming the insulating paint and keeping the vacuum at 500Pa, the volatilization amount is very small. Continuing to vacuum after the paint is input will not affect the volatilization of the insulating paint and will not damage the vacuum equipment.

[0045] Input positive pressure up to 0.3Mpa to make the insulating paint completely penetrate into the coil. Keep it for 30 minutes and then release the pressure. This allows the phase-shifting transformer to be immersed in a completely vacuum state with very few bubbles inside. The insulating paint has high permeability. After impregnation and curing, the phase-shifting transformer is beautiful, has strong mechanical properties, and has an enhanced insulating protective layer.

[0046] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An environmentally friendly high thermal conductivity insulating paint, characterized in that: The dry components of the insulating varnish are composed of the following components by mass percentage:

2. An environmentally friendly high thermal conductivity insulating paint, characterized in that: The insulating varnish has a viscosity of 500-2000 mPas / 25°C, a gel time of 4-10 minutes at 120°C, a thermal conductivity of >1.5 W / (mK), a filler content of <20%, an electrical strength of ≥20 mV / m, and a bonding strength of ≥100N.

3. A method for preparing an environmentally friendly high thermal conductivity insulating paint, characterized in that: The specific steps include: After the phase-shifting transformer is moved into the paint dipping tank, vacuum is drawn to 500 Pa and maintained for 30 minutes; Input the insulating paint as claimed in claim 1, continue to perform the continuous vacuuming method, and keep the vacuum at 500 Pa for 30 minutes; Input positive pressure to 0.3Mpa to allow the insulating varnish to completely penetrate into the coil, maintain pressure for 30 minutes and then release the pressure.

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