VPI-based insulating impregnating paint and insulating treatment method of electrical product
An insulating impregnating varnish, quality technology, applied in chemical instruments and methods, materials for heat exchange, devices for coating liquid on the surface, etc., can solve problems such as cracking of insulating impregnating varnish, hidden safety hazards, etc., to reduce thermal stress and improve Thermal conductivity, the effect of reducing the thermal expansion coefficient
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preparation example 1
[0070] Preparation of shell: 10 g of soluble thermoplastic polyimide (PI) powder and 50 ml of dimethylacetamide (DMAC) solvent were placed in a reaction vessel, and stirred at room temperature (for example, using a magnetic stirrer) until the powder was completely Dissolved to obtain a polyimide solution. 0.2 g of graphene oxide (GO) and 50 ml of dimethylacetamide (DMAC) solvent are placed in a reaction vessel to uniformly disperse the graphene oxide (GO) (for example, using ultrasonic waves) to obtain a graphene oxide solution. The above-mentioned polyimide solution and graphene oxide solution are mixed uniformly (for example, a magnetic stirrer is used) to obtain a PI-GO solution.
[0071] Preparation of core: 2 g of neopentyl glycol (NPG), 25 ml of acetone and 1 g of pentaerythritol were added to the reaction vessel and dissolved to obtain an NPG-PE solution.
[0072] The preparation method of nanoparticles: PI-GO solution was used as shell solution, NPG-PE solution was us...
preparation example 2
[0074] The preparation of the shell was the same as in Preparation Example 1.
[0075] Preparation method of core: 3 g of neopentyl glycol (NPG), 25 ml of acetone and 1 g of pentaerythritol were added to the reaction vessel, and dissolved to obtain an NPG-PE solution. Dissolve 2 g of trimethylolethane (PG) in 20 ml of absolute ethanol to obtain a PG solution.
[0076] Preparation of nanoparticles: In this example, the three-layer coaxial electrospray method was used to prepare nanoparticles, that is, the PI-GO solution was used as the canopy layer solution, the PG solution was used as the shell layer solution, and the NPG-PE solution was used as the core layer solution, and the voltage was adjusted. To 18~22kV, the distance is 15cm, the canopy injection rate is 1ml / h, the shell injection rate is 0.8ml / h, and the core injection rate is 0.5ml / h, and electrosprayed nanoparticles with core-shell structure were obtained.
preparation example 3
[0078] Preparation of shell: 0.2 g of graphene oxide (GO) and 25 ml of acetone solvent were placed in a reaction vessel to uniformly disperse graphene oxide (GO) (eg, using ultrasonic waves) to obtain a graphene oxide solution. 10 g of E03 epoxy resin and 25 ml of acetone solvent were placed in a reaction vessel to completely dissolve the E03 epoxy resin to obtain an epoxy resin solution. The epoxy resin solution and the graphene oxide solution are mixed uniformly (for example, using a magnetic stirrer) to obtain a GO-epoxy resin solution with a concentration of 20%, which is left to stand for defoaming.
[0079] Preparation of core: 2 g of neopentyl glycol (NPG), 25 ml of acetone and 1 g of pentaerythritol were added to the reaction vessel and dissolved to obtain an NPG-PE solution.
[0080] Preparation of nanoparticles: the GO-epoxy resin solution was used as the shell solution, the NPG-PE solution was used as the inner core solution, the voltage was adjusted to 18-22 kV, th...
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