60results about How to "Good electrical resistance" patented technology

Disclosed is a successively biaxially stretched film obtained by successive biaxial stretching method comprising extruding a melt of a β-crystal nucleating agent-containing polypropylene-based resin composition from a T-die, cooling the extruded resin on a chill roll, and stretching the resulting web sheet longitudinally and then transversely, wherein the longitudinally stretched sheet is made to have a degree of β-crystal orientation of less than 0.3 by the following method (I) and/or (II), optionally subjected to annealing treatment, and transversely stretched:

• • method (I): melting the polypropylene-based resin composition containing needle crystals of a specific β-crystal nucleating agent at a temperature not lower than m.p. of the polypropylene-based resin and lower than dissolution temperature of the β-crystal nucleating agent in the polypropylene-based resin melt, and extruding the melt from the T-die at the same temperature,
  • method (II): adjusting neck-in ratio during longitudinal stretching to 25 to 55%.

The porous polypropylene film has good breakage resistance during manufacture, excellent thickness uniformity, high porosity and air-permeability, and is useful for battery separators.

The invention relates to a high-molecular-weight polymer nucleating agent-modified ultrahigh-molecular-weight polyethylene blend material. The blend material comprises the following raw materials by weight: 60 to 100 parts of UHMWPE, 5 to 12 parts of HDPE, 6 to 16 parts of LLDPE, 0.1 to 3 parts of a high-molecular-weight polymer nucleating agent and 1.5 to 3 parts of a flow modifier. The high-molecular-weight polymer nucleating agent has the advantages of no odor, good dispersibility, good compatibility, capacity of realizing heterogeneous crystallization, a high degree of crystallization and a small application amount; the high-molecular-weight polymer nucleating agent-modified ultrahigh-molecular-weight polyethylene blend material retains original characteristics of polyethylene UHMWPE and has obviously improved tensile strength, impact strength, bending strength, Vicat softening temperature, elongation at break and Shore hardness and a reduced mortar wear rate.

The plugging technology for SF6-insulation electric equipment comprises: adding nano powder of Al2O3/10 or SiO2/10 into polyurethane to mix with polyacrylate and form mixture (1) for coating on the surface of leakage (3); after partial drying and hardness up to 70+-5%, coating plugging material (2) on surface of (1); wherein, in material (1), the weight ratio of basis material, curing agent and nano powder is 1:1:0.1; in material (2), the weight ratio of basis material and curing agent is 1:1. This invention applies two-stage coating technology, overcomes defects in prior art, and has wide application.

The invention discloses a weather-resistant halogen-free flame-retardant light diffusion PC/PBT material for a charging pile panel and a preparation method thereof. The material comprises the following raw materials in parts by weight: 77-85 parts of polycarbonate, 8-12 parts of PBT, 7-11 parts of bisphenol A bis(diphenyl phosphate), 0.3-0.7 part of methyl phenyl siloxane, 0.3-1 part of a transparent toughening agent, 0.4-0.8 part of an antioxidant, 0.1-0.4 part of a light stabilizer, 0.1-0.4 part of an ultraviolet light absorber, 0.2-1 part of an aldehyde inhibitor and 0.5-1 part of a light diffusion agent. The invention also provides a preparation method of the PC/PBT material. According to the invention, the halogen-free liquid flame retardant and an auxiliary flame retardant are compounded, so that a PC/PBT material product can achieve a V0-grade flame retardant effect in an extremely thin state without adding a dripping agent PTFE, the haze and transparency are good, the mechanical properties are not influenced, and the comprehensive properties of the PC/PBT material are improved.

The invention relates to the technical field of ceramic part manufacturing, in particular to a sintering process for an automobile ceramic sparking plug. The sintering process comprises the five steps of isostatic compaction, abrasive machining, biscuit firing, glazing and high-pressure sintering. According to the sintering process, dry pressing molding is used for replacing a traditional slurry injection hot briquetting process, an isostatic press is used for conducting cold press molding on dry powder, and in the process engineering, the parameters such as the feeding amount of the dry powder, the heating temperature and time, the thickness of an enamel layer are continuously optimized. A formed sparking plug product is high in density, small in sintering shrinkage, stable in thermal performance, high in production efficiency and high in applicability.

Disclosed is a surface acoustic wave resonator which comprises, on a piezoelectric substrate 19 , an IDT electrode 1, reflector electrodes 2 disposed to be adjacent to both sides of the IDT electrode 1 in a main propagation direction F of surface acoustic waves at the IDT electrode 1 , and auxiliary reflector electrodes 3 that are disposed at four positions external to the reflector electrodes 2 on virtual straight lines extending from the bus bar electrodes 12 a of the IDT electrode 1 in an inclined manner so that the periodic direction G of periodically arranged electrodes 14 b is oriented toward the IDT electrode 1.

A surface steel nail type steel sleeve packed optical fiber raster strain sensor and method the same comprises a bare optical fiber and a packed material, and is characterized in that the tail of the bare optical fiber is provided with a sleeve; the sleeve is arranged in an armoured cable; the outside of the armoured cable is provided with the steel sleeve; two ends of the steel sleeve are respectively provided with an end part expanding head; the surface of the steel sleeve is welded with a plurality of steel nails. The intensity of the sensor can meet the condition of long road engineering service period, severe service environment and the like, making a sensor and a pavement to reach the best cooperative transformation effect, thereby reducing the measuring error caused by difference module of the sensor and the pavement. The surface is welded with the steel nail and two ends are provided with the expanding head form the packed steel sleeve, on the foundation of the sensor adapted to the severe use condition of the road, according to the asphalt pavement material type, the size and the pitch of the sensor surface steel nail can be adjusted, thereby achieveing the best cooperative deformation effect between the sensor and the asphalt concrete.

The invention discloses bioengineering plastic which is prepared from, by weight, 60-70 parts of fluorenone-chitosan polycondensate, 30-40 parts of polyhydroxyalkanoate PHA, 5-8 parts of biomass-basedgraphene and 1-3 parts of silane coupling agent KH560. A preparation method of the bioengineering plastic includes following steps: well mixing fluorenone-chitosan polycondensate, PHA, biomass-basedgraphene and the silane coupling agent KH560; adding the same into a double-screw extruder for extrusion molding to obtain the bioengineering plastic. The bioengineering plastic is high in strength and mechanical modulus, low in latent degeneration, high in wear resistance, excellent in fatigue resistance, chemical drug resistance, electricity resistance, flame resistance, weatherability, impact resistance, thermal resistance and size stability, energy-saving and environment-friendly.

The invention relates to the technical field of cables, and discloses a crosslinked polyethylene cable insulating material and a preparation method thereof. The crosslinked polyethylene cable insulating material is prepared from the following components in parts by weight: 80-90 parts of low-density polyethylene, 2-3 parts of dicumyl peroxide, 0.5-1.5 parts of modified nanometer aluminum oxide, and 1-2 parts of high-voltage stabilizer composite particles. The prepared crosslinked polyethylene cable insulating material has the excellent conductivity temperature characteristic, 'inversion' of anelectric field does not occur in a cable insulating layer, in addition, a voltage stabilizer is not degraded and does not reach with an auxiliary in the cable material extruding and crosslinking processes, thus the action effect of the voltage stabilizer is improved, the local discharge and electric tree capacity of the polyethylene insulating material is improved, and thus the direct-current breakdown strength of the material is improved.

The invention provides a special tool fabric capable of resisting static aggregation. The special tool fabric is characterized by comprising the following raw materials in parts by weight of 40-50 parts of linen fibers, 15-25 parts of bamboo fibers, 5-10 parts of an antistatic modifier, 3-6 parts of modified talcum powder and 1-5 parts of bentonite powder. The preparation method of the antistatic modifier is shown in the specification. The tool fabric is prepared from the linen fibers, the bamboo fibers and other raw materials, and the anti-static performance of the fabric is improved by adding the anti-static modifier, the modified talcum powder and the bentonite powder; and the antistatic modifier is modified by graphene and then is mixed with composite powder, and the antistatic performance of the antistatic modifier is improved through the assistance of nano zeolite powder.

The purpose of the present invention is to provide a method for improving the electrical resistance of a separator, and the safety (CID starting time) and the battery characteristic (initial charge and discharge efficiency) of the electricity storage device provided with the separator. ), and a separator for the electricity storage device, which comprises a polyolefin microporous membrane containing one or more polyethylene, and the microporous film contains more than 1.0 wt% and 2.0 wt% or less of paraffin.

The invention discloses a BOPBT thin film. The BOPBT thin film consists of an upper surface layer, a core layer and a lower surface layer sequentially, wherein the core layer is a PBT polyester chip,and the raw material of the upper surface layer and the raw material of the lower surface layer both comprise, by weight, 70-76% of the PBT polyester chip and 24-30% of a PBT polyester master batch. The invention further discloses a preparation method of the BOPBT thin film. According to the BOPBT thin film, the PBT polyester chip and the PBT polyester master batch are adopted for the first time,and the BOPBT thin film is produced on biaxially oriented production equipment; and compared with traditional BOPET thin films, the BOPBT thin film has better properties in terms of water resistance,oxygen resistance and the like and meanwhile has the characteristics of good biodegradation, heat resistance, electrical insulation, water absorption resistance and the like, thereby having broader application prospects.

The invention discloses a preparation method of synthetic material auxiliary fluid for switch processing. The preparation method basically comprises the following steps: adding hydrogen peroxide and a calamine lotion into a mixer, and sufficiently mixing, so as to form mixed liquor; feeding the mixed liquor into a centrifugal blender to perform centrifugal blending on the mixed liquor, then adding fluorite powder, a synergist, a nucleating agent, a lubricant, an antioxidant and an initiator sequentially into a blender, blending the materials, pouring out mixed materials, mixing the mixed materials, uniformly mixing the mixed materials with a graphitic lubricant, polypropylene, dimethicone, silicic acid hydrate, a stiffening agent, talcum powder, a surfactant and bismuth potassium citrate tablets, and then refrigerating mixed auxiliary fluid in a refrigerating chamber. The preparation method has the advantages that the wear resistance and the electrical resistance of synthetic materials can be promoted after the synthetic materials are mixed, overall performance of the synthetic materials is further enhanced, and the synthetic material auxiliary fluid has the effect of improving the quality for produced switches.

The invention relates to a preparation method, in particular to a preparation method of silicon substrates on a ceramic body, and belongs to the technical field of silicon on the ceramic body. According to the technical scheme provided by the invention, the preparation method of the silicon substrates on the ceramic body comprises the following steps: step one, providing a first silicon substrateand a second silicon substrate which are required, and cleaning the first silicon substrate and the second silicon substrate; step two, uniformly coating a ceramic buried material layer on the first silicon substrate, wherein the ceramic buried material layer comprises polysilazane; step three, bonding the second silicon substrate onto the first silicon substrate, wherein the second silicon substrate is isolated from the first silicon substrate through the ceramic buried material layer; and step four, carrying out a ceramization technology on the ceramic buried material layer so as to obtain aceramic body insulating buried layer positioned between the first silicon substrate and the second silicon substrate. According to the preparation method, the silicon substrates on the ceramic body can be prepared and obtained effectively, so that the processing steps are simple, safe and reliable.

The invention provides a silver nanowire anti-electromagnetic fabric and a preparation method thereof. The preparation method comprises the steps that chitosan and hydroxyl-terminated hyperbranched polymer modified silver nanowires are prepared, the fabric is coated with the chitosan and hydroxyl-terminated hyperbranched polymer modified silver nanowires through an electrostatic spraying process,and the silver nanowire anti-electromagnetic fabric is obtained after finishing. The fabric has excellent anti-electromagnetic performance, the computer shielding test is less than 10 uW/cm<2>, and the computer shielding test after 20 times of washing is less than 50 uW/cm<2>. According to the method, waste shells are used as one of raw materials, environmental friendliness is high, the process universality is good, and good popularization value is achieved.

The invention discloses a metal surface hardness easy-to-clean antibacterial vehicle shield and a preparation method thereof, and relates to the technical field of nano coatings. The coating comprises the following raw materials in parts by weight: 1-5 parts of a self-cleaning nano additive, 12-18 parts of hydrogen-containing silicon resin, 0.1-0.3 part of a catalyst, 12-18 parts of nano siloxane, 35-45 parts of methyl cyclohexane, 8-12 parts of an environment-friendly flux, 3-8 parts of a silicon-containing surface additive, 3-8 parts of nano silver and 0.5-3 parts of graphene. The method comprises the following steps: modifying the hydrogen-containing silicon resin, mixing the modified hydrogen-containing silicon resin, an environment-friendly flux, nano siloxane, methyl cyclohexane and a self-cleaning nano additive, putting the mixture into a high-pressure kettle, mixing, stirring and cooling to room temperature to obtain the antibacterial shield. The components are green and environment-friendly, the coating has excellent acid resistance, alkali resistance, antibacterial performance and mechanical strength, the preparation method is simple, convenient and easy to repeat, and the coating is suitable for being used as a coating on metal surfaces of automobiles, machines and equipment.