Nano-enhanced rich resin mica tape with high thermal conductivity and applications thereof

Abstract

The invention discloses a nano-enhanced rich resin mica tape with high thermal conductivity and applications thereof. The nano-enhanced rich resin mica tape with high thermal conductivity is formed by compounding a layer of mica paper, a layer of alkali-free glass cloth or two layers of alkali-free glass cloth, adhesive resin and inorganic nano powder, wherein the weight per unit area of each component is as follows: 70-140g/m<2> of mica paper, 15-70 g/m<2> of alkali-free glass cloth, 60-100 g/m<2> of adhesive resin and 1-15 g/m<2> of inorganic nano powder. The nano-enhanced rich resin mica tape with high thermal conductivity is applied to prepare main insulation of a high-voltage motor. With the adoption of the main insulation prepared by the nano-enhanced rich resin mica tape with high thermal conductivity, the heat conductivity coefficient is not lower than 0.35W.m-1.K-1, the bending strength is not lower than 120MPa at the temperature of 155 DEG C, and the electrical service life is not lower than 1200 hours under 10kV/mm electric field intensity, so that the nano-enhanced rich resin mica tape with high thermal conductivity and applications thereof are beneficial for lowering the temperature rising of a generator and the manufacturing cost of the whole generator, and improving the running reliability of the unit.

Description

technical field [0001] The invention relates to the field of manufacturing high-voltage motor main insulation, in particular to a nano-reinforced high-thermal-conductivity multi-glue powder mica tape used for manufacturing high-voltage motor main insulation. Background technique [0002] Powder mica tape is a tape-shaped material specially used to make the main insulation of high-voltage motors. It is usually made of a layer of reinforcing material (alkali-free glass cloth or organic film) and a layer of powder mica paper bonded together by adhesive resin. It is made by bonding two layers of reinforcing materials with a layer of powder mica paper in the middle by bonding resin. In the industry, the mica tape with a binding resin content of 5-10% is called a less-adhesive mica tape, and the mica tape with a binding resin content of 32-40% is called a multi-adhesive mica tape. In the prior art, there are two methods for making the main insulation of high-voltage motors: one i...

AI Technical Summary

Problems solved by technology

The comprehensive properties of these existing multi-glue mica tapes are not bad, but generally have a low thermal conductivity (only 0.25-0.28W·m -1 ·K -1 ), poor mechanical properties when the temperature exceeds 100°C (for example: the bending strength at 100°C is only 20-30MPa), etc.

[0004] When these existing multi-powder mica tapes are applied to the main insulation of internally cooled high-voltage generators, since the operating temperature of the internally cooled units is generally only 70-90°C, their performance can basically meet the application requirements; When the main insulation of the air-cooled high-voltage generator is used, because the heat dissipation method of the air-cooled unit is different from that of the internal cooling unit, the heat generated inside the generator must pass through t...