Do you know the story behind the water-based insulating paint?

Insulating paint, also called insulating paint, is a kind of paint with excellent electrical insulation

1.

Water-based insulating paint refers to insulating paint with water as the main solvent.

Water-based insulating paint mainly has the following problems:

• As the main body of the water-based insulating paint, the water-based polymer itself needs to have a large number of polar groups, ionic groups or the emulsification of these groups to dissolve or disperse in water.

  
  

• The corrosion of metal by water or ionic groups often damages the insulation treatment objects of metal-containing parts

  
  

• It must have a certain degree of mechanical strength, especially at high temperatures, to maintain a certain bond strength, otherwise, under the action of electromagnetic force and mechanical stress, the winding may loose or deform and cause accidents; however, it is usually soluble in water The insulating varnish is difficult to have good mechanical strength and adhesion

  
  

2.

1.

Alkyd resin insulating varnish is the largest type of insulating varnish.

Tung oil, maleic anhydride, and trimethylolpropane are used as raw materials to prepare tung oil alkyd resin; then through silicon modification, a water-based insulating paint with electrical insulation strength of 130MV/m and good comprehensive performance is prepared

2.

The synthesis method of water-based polyester is basically similar to that of water-based alkyd resin, but water-based polyester introduces more heat-resistant aromatic diacids, so the electrical insulation is also superior to water-based alkyd resins, due to its excellent resistance Thermal insulation, water-based polyester can be used as the current F-level and above water-based insulating paint
.
Water-based polyesters are generally synthesized by introducing hydrophilic groups into the polyester resin structure during the synthesis process, using dibasic acids, diols, triols, trimellitic anhydride and other raw materials to synthesize by a two-step melt polymerization method.
Polyester is added to n-butanol after cooling to form a solution with a solid content close to 80%
.
Add DMEA to neutralize and dilute with water to form water-based polyester for use in silicon steel sheet paint
.
The prepared waterborne polyester paint film has good overall performance and is a good silicon steel sheet paint
.

3.
Water-based epoxy insulating paint

Epoxy resin paint has excellent mechanical strength, electrical properties, chemical resistance, good moisture resistance, low shrinkage, good adhesion and compatibility with other materials, but high price
.
When high molecular weight solid epoxy resin is used as the main component of insulating varnish for some special needs, more solvents need to be added to obtain low-viscosity insulating varnish that is easy to impregnate.
Therefore, the water-based epoxy resin is environmentally friendly.
Improving the working environment and reducing costs are of great significance
.

4.
Water-based polyimide insulating paint

Polyimide (PI) refers to a type of polymer containing polyimide rings in the main chain.
It is a high-performance polymer with excellent thermal stability, outstanding mechanical properties and good electrical properties
.
These materials are mostly prepared by further dehydration and cyclization of the precursor polyamic acid (PAA)
.