44results about How to "Improve PTC Strength" patented technology

The invention discloses a polymer-carbon nanotube-carbon black composite temperature self-regulating positive temperature coefficient (PTC) electric heating material. The polymer-carbon nanotube-carbon black composite temperature self-regulating PTC electric heating material has positive temperature coefficients and high PTC intensity. The polymer-carbon nanotube-carbon black composite temperature self-regulating PTC electric heating material comprises: by weight, 35 to 75% of one or more of high-density polyethylene, low-density polyethylene, ethylene-vinyl acetate copolymer, ethylene-ethyl acrylate copolymer, nitrile rubber buna, epoxy resins and polyvinylidene fluoride, 15 to 55% of carbon black and carbon nanotubes, 3 to 12% of an inorganic filling material, and 0.02 to 0.1% of an antioxidant. The above raw materials are mixed, then are subjected to processing molding by a banbury or a double-screw extruder, and are subjected to radiation crosslinking to form the polymer-carbon nanotube-carbon black composite temperature self-regulating PTC electric heating material with high PTC intensity. The polymer-carbon nanotube-carbon black composite temperature self-regulating PTC electric heating material has high PTC intensity and thus a leakage current is low and security and heat stability are good. In an electric warming respect, the polymer-carbon nanotube-carbon black composite temperature self-regulating PTC electric heating material is widely utilized in the fields of temperature self-regulating heaters, over-current protection and temperature sensors.

The invention discloses a polymer matrix composite material with high PTC strength and stability and a preparation method thereof, and the composite material comprises UHMWPE and PVDF, CB and MWNT conductive filling materials which are treated by surface treatment by a titanate coupling agent, and an antioxidant 1010; the preparation method comprises the following steps: performing surface treatment of the CB and MWNT conductive filling materials by the titanate coupling agent, performing vacuum drying of PVDF and UHMWPE with a volume ratio of 1:1, adding PVDF into a torque rheometer, heating and melting for 2 min, adding another matrix of UHMWPE and the antioxidant 1010, wherein the amount of the antioxidant 1010 is 1% of the total mass of the matrix; mixing the mixture of the two matrixes for 10 min, adding the filling materials, mixing at 250 DEG C for 15 min; after melt blending, performing hot pressing with a constant temperature of 250 DEG C and a constant pressure of 18 MPa for 10 min to obtain the sample. The composite material of the invention has good conductivity and low room-temperature conductivity, and has a conductivity of up to 10-1 near a percolation threshold; the conductivity of the composite material can be changed by adjusting the contents of the filling materials in the composite material; the composite material has high PTC strength, good repetition stability, and reduced NTC effect.

An electrically conductive composite high-molecular material with positive temp coefficient (PTC) for heater with self limitation of temp and over-current protection element is prepared through pre-treating the electrically conductive filler by reactive treating agent and chemically graft reaction between said filler, treating agent and high-molecular base body. Its advantages include high adhesive to metallic electrode, high PTC and high stability.

The invention provides a positive plate and a lithium ion battery containing the positive plate. The safety of the battery cell is improved by controlling the seepage thresholds of the safety coatingcoating the surface of the positive current collector and the positive active material layer, and meanwhile, relatively high energy density and excellent electrical properties are ensured. Particularly, the seepage threshold value of the positive active material layer is small, and the addition amount of the conductive agent is small, so that a good electron path can be ensured, and the energy density of the positive plate can be increased.

The invention provides a positive temperature coefficient material, the material comprises resin, a conductive filler, a non-conductive filler and an auxiliary agent, the resin is a mixture composed of one of high-concentration polyethylene, medium-concentration polyethylene, low-concentration polyethylene and polyvinylidene fluoride and 1, 3: 2,4-dibenzylidene sorbitol, the conductive filler is a mixture composed of one of nickel coated copper powder, nickel coated iron powder and nickel coated molybdenum powder and nickel coated silver powder, the non-conductive filler is a mixture composedof one of magnesium hydroxide and magnesium oxide and one of aluminum hydroxide and alumina, simultaneously a positive temperature coefficient thermistor is provided in the invention, the thermistor comprises a first conductor, and the positive temperature coefficient material as well as a second conductive conductor which are successively attached on the first conductor, wherein the positive temperature coefficient material is the positive temperature coefficient material provided in the invention, the positive temperature coefficient thermistor has characteristics of low resistor, high positive temperature coefficient (PCT) strength and good stability.

The invention discloses a low-resistance PTC (positive temperature coefficient) composite material. The composite material comprises thermoplastic polymers, conductive materials subjected to surface treatment by a coupling agent, inert fillers, compatilizers, antioxidants and a titanate coupling agent. The conductive fillers are carbon black or carbon nano tubes which are subjected to surface treatment by the coupling agent and serve as conductive substances, thus improving the dispersibility of the conductive fillers in a matrix and combinability of the conductive fillers and the matrix, improving the conductivity, reducing the room temperature resistivity of the composite material and improving the property stability of the composite material; therefore the composite material has low resistivity, high PTC strength, good resistance stability and extremely low leakage current and meets the requirements of large current and high voltage.

The invention provides a material with positive temperature coefficients, which is a product obtained by mixing a mixture containing conductive particles and polymers, wherein the conductive particlesare metal conductive particles with partially oxidized surfaces, and the oxygen content in the conductive particles is between 0.001 and 0.05 percent by weight. According to the material with positive temperature coefficients, the conductive particles are the metal conductive particles with partially oxidized surfaces so that the compatibility between the conductive particles and the polymers andthe dispersity of the conductive particles in the polymers can be improved; moreover, the material with positive temperature coefficients has high PTC intensity reaching as high as 10.4, and can still maintain low room-temperature resistivity at the same time.

The invention discloses a low-resistance type automatic-temperature-limited polymer heat tracing cable. A PTC (positive temperature coefficient) material adopts a polymer based PTC composite material, wherein high density polyethylene, ethylene- methacrylate ionomer and polyester acrylate oligomer at the weight ratio of (5:2:1)-(4:2:1) jointly form a polymer material matrix; the weight percentages of carbon black, carbon fiber, zinc oxide, tetra-pentaerythritol ester and dicumyl peroxide added to the polymer material matrix is 14%-17%, 6%-12%, 0.3%-0.6%, 0.06%-0.08% and 0.005%-0.01%, and the weight ratio of 2-methyl-1-(4-(methylthio)phenyl)-2-morpholine-1-propanon and carbon black is 0.05-0.2. According to the low-resistance type automatic-temperature-limited polymer heat tracing cable, performance of the heat tracing cable is optimized, the structure is simple, the low-temperature resistivity is low, and the PTC strength is high.

The embodiment of the invention relates to a conductive composite material with an isolation and double-percolation structure and high PTC strength, and a preparation method and application of the conductive composite material. The conductive composite material is prepared from raw materials comprising following components: linear low-density polyethylene, polyvinylidene fluoride, a conductive filler and an antioxidant. The preparation method of the conductive composite material comprises the following steps that the linear low-density polyethylene, the conductive filler and the antioxidant are fused and blended in an internal mixer, the temperature of the internal mixer is set to be 130-160 DEG C, and a clad master batch is prepared; then the polyvinylidene fluoride is added into the internal mixer, the temperature of the internal mixer is set to be 130-150 DEG C, and the clad master batch and the polyvinylidene fluoride are fused, blended and then taken out; and hot pressing is conduced to obtain the conductive composite material. The prepared CB/LLDPE/PVDF conductive composite material has the isolation and double-percolation structure, is low in conductive content, high in PTCstrength and high in stability, and can be used as a temperature-sensitive material.

The invention discloses a method to make metal particle modification carbon black making conductive macromolecule compounding material that includes the following steps; adding the carbon black into H(AuCl) solution that the thickness aurum iron is 150ppm-250ppm, whisking, filtering the carbon black and washing, drying to gain the carbon black that the surface is adsorbed aurum iron; putting the carbon black into NaBH solution, whisking and filtering, washing, drying to gain the carbon black that has aurum particle adsorbed on the surface; mixing the carbon black with high density polyethylene, devoting into Banbury mixer, milling for 12-18 minutes in 160-180 degree centigrade. The invention improves the PTC intension of the conductive macromolecule compound material.

The invention discloses a polymer-based conductive composite material and a method for preparing a heat tracing tape cable from the polymer-based conductive composite material and belongs to the fieldof cable preparation. The material comprises the following raw materials by weight: 50-70 parts of linear low density polyethylene, 30-40 parts of an ethylene-vinyl acetate copolymer, 15-25 parts ofoil furnace carbon black, 10-20 parts of dicumyl peroxide, 8-12 parts of a conductive filler, and 5-10 parts of an auxiliary agent. The heat tracing cable is simple in preparation process and worthy of popularization; the ternary composite material is constructed by adopting linear low-density polyethylene, an ethylene-vinyl acetate copolymer and oil furnace carbon black as basic components; the ternary composite material is endowed with electrical conductivity and high PTC strength through the oil furnace carbon black, dicumyl peroxide can be prevented from thermal decomposition through the antioxidant in the auxiliary agent, and the comprehensive performance of the heat tracing cable can be further improved through the flame retardant, the stabilizer and the dispersing agent in the auxiliary agent.

The invention relates to the field of manufacturing materials of electron components, in particular to a kernel material of a novel voltage-withstanding overcurrent self-recovery protector, namely a core material manufacturing material, and the voltage-withstanding capacity can reach 600 V. The voltage-withstanding overcurrent self-recovery protector is composed of a core material arranged between two metal membranes, the metal membranes are provided with leading-out electrodes, and the outer layers of the metal membranes are enveloped with insulating and sealing materials. The core material is prepared from, by weight, high-density polyethylene, a conducting material, antioxidant 1010 and fire retardant prepared from magnesium hydrate. A novel thermistor kernel manufacturing material with good adhesive performance and the more remarkable jump performance can be provided, a thermistor has a positive temperature coefficient effect, the room temperature specific resistance is 10-2 Omega.cm, the PTC strength is larger than 107 orders of magnitude, and meanwhile a material manufacturing method is provided.

The invention discloses a self-temperature-limiting electric tracing band with a positive temperature coefficient and a preparation method thereof, and relates to the technical field of tracing band preparation, the self-temperature-limiting electric tracing band comprises a wire, the wire is coated with a heat conduction material, and the heat conduction material is sequentially provided with a first insulating layer, a shielding layer and a second insulating layer; the heat conduction material is composed of, by mass, 5-15% of a conductive filler, 1-5% of a sensitizer and a heat tracing band base material. According to the invention, a single high polymer material is adopted as a heat tracing band base material, and the content of conductive filler is low, so that the heat tracing band has excellent bending resistance, high tensile strength and high PTC strength; in the preparation process, after the electric tracing band is extruded into a line, static high-temperature heat treatment and electric treatment are utilized to promote directional movement and agglomeration of the conductive filler, the distribution state of the filler is accurately regulated and controlled, a locally concentrated conductive network is constructed, and the electric tracing band has excellent processing fluidity, mechanical property and heating performance; the method can be widely applied to the fields of various tank bodies, pipeline heat preservation, electric blankets and the like.