37results about How to "Low percolation value" patented technology

The invention discloses high-dispersion silver powder and solar battery electrode conductive silver paste, wherein the conductive silver paste is prepared from the following components in mass percentage: 53-61.8% of high-dispersion silver powder in claim 1, 21.5-31% of glass cement and 15-17.6% of organic carrier. The high-dispersion silver powder provided by the invention has very good dispersity and by means of the conductive silver paste prepared by the high-dispersion silver powder, the usage amount of the silver powder is reduced and the conductive efficiency is improved in the mean time; in addition, the conductive silver paste provided by the invention is clean and environmental-friendly and is suitable for popularization and application. By means of the high-dispersion silver powder and the solar battery electrode conductive silver paste which are provided by the invention, the defects of poor dispersity of the conventional silver powder and large usage amount of the silver powder of the conventional conductive silver paste are overcome.

The invention belongs to the technical field of conductive macromolecular materials and particularly relates to a method for preparing a conductive macromolecular composite material with an isolation structure. The invention provides the method for preparing the conductive macromolecular composite material with the isolation structure. The preparation method comprises the following steps: uniformly mixing two macromolecular materials and conductive particles by adopting a mechanical blending method to obtain a macromolecular material / conductive particle blending material, wherein the conductive particles are selectively distributed between interfaces of the two macromolecular materials to form a conductive network; and then, injection moulding the macromolecular material / conductive particle blending material by adopting a plunger injection moulding device to prepare the conductive macromolecular composite material with the isolation structure. According to the method provided by the invention, the conductive particles are selectively distributed between the two macromolecules to form the conductive network so as to form the so-called isolation structure, thus the percolation threshold of the material is reduced to a great extent. The invention provides a new concept for preparing the conductive macromolecular composite material which is low in percolation threshold, good in processing performance and extremely high in moulding efficiency.

A composition formula and preparation method for high polymer composite of air-sensitive conduction are disclosed by the present invention. The composite can be prepared by using water polyurethane containing polar hard section and nonpolar soft section as base body to compound with conductive packing.

The invention belongs to the field of conductive polymer composites pressure-sensitive materials and particularly relates to a preparation method of a porous conductive polymer material with pressure-sensitive property and an application thereof. The preparation method of the porous conductive polymer material with pressure-sensitive property comprises the following steps: a) suspension preparation; b) unidirectional freezing; and c) low-temperature low-pressure drying. The porous conductive polymer composite with pressure-sensitive property prepared in the invention has excellent stability and resilience and can be used for preparing a light polymer-based strain sensor; and by combining the obtained conductive polymer composite with the circuit board and semiconductor technology, various pressure-sensitive sensors with good stability and long service life can be made.

The present invention relates to an electroconductive high-molecular composite material composition which has gas-sensing response characteristics and its made by using amorphous polystyrene matrix filled up with electroconductive filler and its preparation method. Said material is made up by using amorphous polystyrene as matrix and combining it with electroconductive filler, and has higher gas-sensing response characteristics for organic solvent steam having a certain compatibility with said matrix, so that when it is met with several organic solvent gases, the electric resistance of said composite material can be quickly changed.

The invention relates to the field of polymer composite materials, in particular to a nylon6 / thermal expansion graphite conductive composite material and a preparation method thereof. The composite material is prepared from 98.636099.818vol% of nylon 6(PA6) and o.182-1.364 vol% of thermal expansion graphite (EG). The preparation method comprises the steps that the surface of the nylon 6 is evenly wrapped by the thermal expansion graphite through mechanical mixing, nylon6 / thermal expansion graphite conductive composite particles are obtained, and the composite particles are subjected to compression molding to obtain the conductive composite material. In the composite material, EG forms a continuous conductive network with an isolation structure in a PA6 base body, and the composite material has good conductivity and extremely low percolation value.

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 preparation method of a conductive PP (polypropylene) thin film with a low percolation threshold and high mechanical properties. The preparation method comprises steps as follows: PP aggregates are put in a melt-blowing machine for preparation of PP fiber webs through melt-blowing; conductive particles are dispersed in a xylene solvent and subjected to ultrasonic oscillation, and a solution A is prepared; the PP fiber webs are placed in the solution A and subjected to the ultrasonic oscillation for 2-5 min, then the PP fiber webs are taken out, washed and naturally dried, and conductive fibers are obtained; the conductive fiber webs are divided into an upper layer and a lower layer and are laid on templates of a press device, a few PP aggregates are placed between the fiber webs and subjected to hot pressing in a vacuum press for 10-15 min, and the conductive PP thin film with higher comprehensive mechanical properties and the lower percolation threshold is obtained. The ultrafine PP fiber webs prepared with a melt-blowing technology have large specific surface area, surfaces of the fiber webs are uniformly modified with conductive filler with an ultrasonic dispersion method, a uniform conductive network structure is formed in the film after hot pressing, the technology is simple, and the prepared conductive thin film has both the higher mechanical properties and the lower percolation threshold.

The invention discloses a method for preparing a polymer material with a continuous alternating layered structure, which comprises the following steps: step 1, mixing 30-70 parts of the first resin or the first resin composite, 70-30 parts of The second resin or the second resin compound is pre-mixed and added to a twin-screw extruder, melted, blended and extruded at a temperature of 100-300 ° C, cooled, and pelletized to obtain blended pellets; step 2, the obtained The blended pellets are subjected to high-speed thin-wall injection molding at an injection temperature of 100-300° C. and an injection speed of 50-1200 mm / s to prepare a polymer material with a continuous alternating layered structure. The whole operation process of the invention is simple, the production cost is low, it is suitable for large-scale industrial production, the thickness of the continuous alternating layered structure can be regulated by adjusting the component distribution ratio of the blend, and it is suitable for various blend systems.

The invention discloses a polymer-based conductive elastomer and its preparation method. According to the preparation method, a certain percentage of a cross-linking agent is used to crosslink a polymer matrix and the cross-linked polymer matrix is crushed to obtain cross-linked particles; and the cross-linked particles are added in proportion into the matrix to prepare a cross-linked particles / elastic matrix / conductive carbon material composite elastomer. By the above method, conductive percolation threshold of the polymer-based conductive elastomer can effectively be reduced; stretching strength of the polymer-based conductive elastomer under the stretching action can be enhanced; and elasticity of the polymer-based conductive elastomer can effectively be raised, and strain recovery rate of the polymer-based conductive elastomer under strain retraction action can be raised. The polymer-based conductive elastomer prepared by the above method has advantages of good electrical property, enhanced stretching strength and good and stable elasticity and rebound resilience. The method provided by the invention has advantages of simple preparation technology, low cost, short production period and the like during the construction process.