2results about How to "High surface resistance" patented technology

The invention relates to a modified iron-nickel magnetic powder core and a preparation method and application thereof, and the preparation method comprises the following steps: putting an iron-nickel magnetic powder core subjected to insulation coating and annealing treatment into an acid solution, standing, enabling the surface of the iron-nickel magnetic powder core to react with the acid solution to generate a salt mixture coating layer, and obtaining the modified iron-nickel magnetic powder core. A pickling method is adopted, the iron-nickel magnetic powder core subjected to insulation coating and annealing treatment is subjected to surface treatment, an acid solution reacts with metal elements on the surface of the iron-nickel magnetic powder core to generate a salt mixture coating layer containing iron and nickel, and the coating layer plays an insulation role; therefore, the resistance of the iron-nickel magnetic powder core can be improved, the loss can be reduced, the performance of the modified iron-nickel magnetic powder core can be obviously improved, and the situation that the surface resistance is low, the loss is high and the service life is long due to decomposition of an insulating layer caused by incomplete insulation coating or too high heat treatment temperature, insufficient atmosphere protection and the like of the iron-nickel magnetic powder core is avoided. And normal use cannot be realized.

Provided are a surface protective film and an optical member. A surface protective film (10) includes: a base film (1) composed of a resin having transparency; an antistatic agent layer (2) formed on one side of the base film (1); and an adhesive layer (3) formed on the side of the base film (1) opposite the antistatic agent layer (2). The antistatic agent layer (2) includes: a first layer (2a) containing a conductive polymer; and a second layer (2b) disposed on the side opposite the base film (1) relative to the first layer (2a) and containing nanocarbon.