Environment protective adhesive

The invention discloses an environmentally-friendly adhesive which consists essentially of high molecular polymer, a solvent and a plasticizer. The high molecular polymer is polyvinyl alcohol resin, the plasticizer is phthalic acid ester compound and the solvent is at least one or two selected from esters, ketones and alcohols. The adhesive has high bonding strength and good stability without impurities and is mainly used for producing high multilayer-chip multilayered ceramic capacitors; after being ball-milled with ceramic powder, porcelain powder is evenly dispersed and the ultra-thin electronic ceramic diaphragms obtained after tape casting are uniform, smooth and glossy without pinholes and foams and do not strip or scale off automatically and the gas volatilized after the tape casting causes little pollution to the atmosphere.

Method for preparing high-conductivity granular material by utilizing waste and old manganese-zinc ferrite

The invention discloses a method for preparing a high-conductivity granular material by utilizing waste and old manganese-zinc ferrite. The method comprises the following steps of: a, removing impurities by reinforced dissolution of sulfuric acid; b removing impurities by reduction; c, removing impurities by coprecipitation; and d, removing impurities by hydrolysis. The invention aims to overcomethe defect in the prior art, and provides a method for preparing a high-magnetic conductivity (mu i is equal to over 10,000) compound raw material granular material of manganese-zinc ferrite by performing acid dissolution and impurity removal on grinding power and magnetic core wastes generated in the process of machining the magnetic cores and magnetic devices in obsolete electrical equipment.

Novel capacitance voltage-division type voltage transducer

The invention discloses a novel capacitance voltage-division type voltage transducer which comprises an electrode, a high voltage component, a voltage divider, a shielded wire and a casting body. The capacitance voltage-division type voltage transducer has a simple structure, and is convenient to install; a dielectric medium with a favorable temperature characteristic and a favorable voltage coefficient is used for filling the key components (voltage divider and the high voltage component) of the capacitance voltage-division type voltage transducer, the influence of temperature and electromagnetic interference on errors can be preferably overcome, and the secondary output accuracy of a product reaches level 0.2.

Nonmagnetic sheet type ceramic dielectric capacitor in multiple layers, and preparation method thereof

Current sensor adopting differential coil structure

The invention discloses a current sensor adopting a differential coil structure for eliminating external magnetic field interference. The current sensor comprises a primary current carrier, a primary current sensing unit, a compensating winding, a double-shielding twisted pair and an air plug. The primary current carrier passes through the center of the primary current sensing unit; and the metal shielding shell of the winding, the shielding layer of a signal transmission wire and the metal part of the air plug form a whole to improve the signal-to-noise ratio of secondary signals. The hollow coil has the key technology of improving the noise immunity of power frequency magnetic fields. By improving the internal structure of the coil, adding a loop wire in the coil, manufacturing two hollow coils with consistent structures and performance parameters and counteracting the external magnetic field interference through differential structures connected in series at the corresponding terminals ...

Environment protective adhesive

The invention discloses an environmentally-friendly adhesive which essentially consists of high molecular polymer, a solvent and a plasticizer. The high molecular polymer is polyvinyl alcohol resin, the plasticizer is phthalic acid ester compound and the solvent is selected from at least one or two of esters, ketones and alcohols. The adhesive has high bonding strength and good stability without impurities and is mainly used for producing high multilayer-chip multilayered ceramic capacitors; after being ball-milled with ceramic powder, porcelain powder is evenly dispersed and the ultra-thin electronic ceramic diaphragms obtained after tape casting are uniform, smooth and glossy without pinholes and foams and do not strip or scale off automatically and the gas volatilized after the tape casting causes little pollution to the atmosphere.

Addictive for tin-electroplating solution of tin methane sulphonate series

This invention discloses an additive for pure-tin plating solution of tin methanesulfonic sulfate series and the solution added this additive, which comprises the following components: (1) non-ionic surfactants; (2) aminated compound; (3) ampholytic surfactant. There isn't toxin such as lead and fluorin, and it is current density of wider rang, high current efficiency and shorter electroplating time. And it is homogeneous surface of coating after electroplating, good film thickness uniformity and surface wettable effect, good durability of weld,strong and tight cohesion of the coating and ...