444 results about "Shock strength" patented technology

The invention belongs to the field of drainage tubes, and particularly relates to a polyethylene-polyvinyl chloride blend-modified tube and a preparation method thereof. The polyethylene-polyvinyl chloride blend-modified tube aims to solve the technical problems of poor shock strength, high sensitivity to temperature, poor ring stiffness, higher cost and short service life in the existing tube. In order to solve the technical problems, the invention provides a polyethylene-polyvinyl chloride blend-modified tube which comprises the following components in parts by weight: 50-150 parts of polyethylene resin, 50-150 parts of polyvinyl chloride resin, 10-30 parts of nano material, 0.5-5 parts of pigment, 2-20 parts of leadless stabilizer, 1-20 parts of processing assistant, 1-5 parts of lubricant, 0.5-5 parts of antioxidant, 0.5-2 parts of photostabilizer, 1-25 parts of solubilizer, 1-15 parts of impact-resistant modifier, 1-15 parts of enhancer and 0.5-10 parts of coupling agent. The polyethylene-polyvinyl chloride blend-modified tube has the advantages of higher ring stiffness, favorable toughness, aging resistance and greatly higher shock strength.

The invention discloses a solvent-free polyurethane adhesive for a composite film, which consists of an A component and a B component, wherein the A component is end-OH polyester polyol, and the B component is end NCO-polyurethane prepolymer; and the A component and the B component are mixed in the molar ratio of functional groups of NCO to OH being 1.2-1.9:1.0. The polyurethane adhesive for the composite film does not need to adopt solvent and has high safety. The adhesive shows low hydroscopic property as well as low hydrolysis and high shock strength due to introducing dimeric dibasic acid, and shows good adhesive property for some substrates which are particularly difficult to adhere and attach. The invention improves the adhesive strength of the composite film through the design of compositions and a molecular structure of the adhesive, the T peeling strength reaches more than 3.8N/15mm after the plastic films are compounded for 3 to 5 days, and the T peeling strength between the plastic and an aluminum-plating film reaches more than 4.2N/15mm.

Embodiments of the invention relate to a supersonic inlet having a cowl lip configured to capture the conic shock and exhibit a zero or substantially zero cowl angle. The inlet may be configured to employ a relaxed isentropic compression surface and an internal bypass. The nacelle bypass may prevent flow distortions, introduced by the capture of the conic shock, from reaching the turbomachinery, thereby allowing the cowl angle to be reduced to zero or substantially zero. Such a cowl angle may reduce the inlet's contribution to the overall sonic boom signature for a supersonic aircraft while allowing for an increase in engine pressure recovery and a subsequent improvement in generated thrust by the engine.

The present invention is halogen-free fireproof polystyrene/polyphenyl ether composition with high shock strength and its preparation, and belongs to the field of polymer material. The composition contains polystyrene resin with high shock strength 40-65 wt%, polyphenyl ether 8-40 wt%, fire retardant 5-25 wt% and machining assistant 0.5-5 wt%, and is prepared through high speed pre-mixing and twice extrusion process. The composition has serial advantages of being fireproof, environment friendly, weatherproof, hot stable, high in mechanical performance, easy in machining, etc. It is suitable for use in display, video recorder, copying press, facsimile machine, printer, air conditioner, refrigerator, etc.

The present invention is one high elasticity polyurethane composition, which is one double component system comprising one pre-polymer component and one polymer component. The pre-polymer component is obtained through the reaction of diisocyanate and polyol and has NCO of 8-15 %, the diisocyanate is MDI and/or carbodiimide modified MDI, and the polyol is polytetramethylene ether polyol or polyoxetane ether polyol and has molecular weight of 1000-3000 and functionality of 2. The polymer component is prepared with the above said polyol, 1, 4-utanediol, catalyst and antiager. The pre-polymer component and the polymer component are mixed in the ratio of 1 to 1, and the mixture is poured, vulcanized and formed to obtain high elasticity polyurethane elastomer with excellent mechanical performance and high shock strength and resilience. The present invention is used mainly in producing roller for roller skates and scooter.

The invention discloses a water-based thermal insulating nano-coating, which is characterized by being composed of the following components by mass percent: 10-20% of tap water, 45-55% of water-based acrylic emulsion, 10-15% of a high-refractive index pigment, 3-5% of a filler, 2-15% of a thermal insulation material, 0.1-0.3% of a wetting agent, 0.5-1.5% of a dispersant A, 0.1-0.2% of a flatting agent, 1-2% of an antifreezing agent, 0.1-0.3% of a defoamer, 1-3% of a coalescing agent, 0.2-0.6% of a thickening agent, 0.05-0.2% of a mildew resistant antibacterial agent and 1-10% of a water-based nano slurry. The water-based thermal insulating nano-coating has the beneficial effects that the coating layer is low in thickness, good in adhesion, high in shock strength and excellent in combination properties, the sunlight reflectivity and hemispherical emissivity of the nano-coating are high and the thermal insulation property of the nano-coating is excellent, the nano-coating is simple and easy to apply and can be directly sprayed, and compared with a solvent type coating, the VOC (Volatile Organic Compound) content of the water-based nano-coating is greatly reduced and the water-based thermal insulating nano-coating has extremely high environmental protection performance.

A method for determining a cardiac shock strength, for example the programmed first-therapeutic shock strength of an implantable cardioverter defibrillator (ICD), including the steps of sensing a change in a T-wave of an electrogram with respect to time such as the maximum of the first derivative of a T-wave of an electrogram; delivering a test shock by (i) delivering a test shock at a test-shock strength and at a test-shock time relating to the maximum of the first derivative of the T-wave with respect to time; and (ii) sensing for cardiac fibrillation. If fibrillation is not sensed, test-shock delivery is repeated at the same test-shock strength and at specific, different test-shock times relating to the maximum of the first derivative of the T-wave. If fibrillation is still not sensed, the shock strength is decreased and test shocks are repeated at the same specific test shock times relative to the maximum of the first derivative of the T-wave. And if fibrillation is sensed, the programmed therapeutic shock strength of the ICD is set as a function of the incrementally greater test-shock strength. Also disclosed is an apparatus for selecting a programmed first-shock strength of an ICD, including a shock subsystem for delivering therapeutic shocks and test shocks to the heart, and a ULV subsystem connected to the shock subsystem, to provide test shocks of test-shock strengths and at test-shock times relating to the maximum of the first derivative of the T-wave with respect to time, and to determine the therapeutic shock strength of the ICD as a function of the test-shock strengths.

The invention discloses a special material for a PVC-M water supply pipe and a preparation method thereof. The special material comprises the components by part by weight as follows: 75 parts of PVC resin, 2.7-8.5 parts of toughener, 1.6-2.8 parts of heat stabilizer, 1.2-2.8 parts of lubricant, 3-10 parts of filling agent and 1.2-4.3 parts of processing material. The filling agent is calcium carbonate processed by silica gel coupling agent. The preparation method comprises the steps as follows: (1) all materials are weighed for using according to the prescription; (2) the calcium carbonate which is processed by the silica gel coupling agent is prepared; (3) the PVC resin is poured into a high-speed kneader to be mixed firstly, the heat stabilizer is poured into the high-speed kneader to be mixed continuously, subsequently, other materials are poured into the high-speed kneader to be mixed continuously, and the materials are discharged to be stirred and cooled; and (4) the materials are sent into a double-screw extruder to be melted and extruded to be granulated. The PVC-M water supply pipe made from the special material for the PVC-M water supply pipe has good toughness and high shock strength.

The invention relates to a high shock resistance type inflaming retarding antistatic polyvinyl chloride composition and a preparation method thereof. The high shock resistance type inflaming retarding antistatic polyvinyl chloride composition is characterized by comprising the following components in parts by weight: 100 parts of polyvinyl chloride, 5-10 parts of chlorinated polyethylene, 10-18 parts of polyoxyethylene, 3.5-5 parts of stabilizing agent, 0.2-0.5 part of lubricating agent and 0-25 parts of organic or inorganic rigid flexibilizer. All of the components are mixed at a high speed, stirred for cooling at a low speed, melt for mixing, hot-cut and air-cooled to obtain blending composition granules. The high shock resistance type inflaming retarding antistatic rigid polyvinyl chloride blending composition adopts a traditional physical blending method, has simple preparation process, and is easy to control. After test, the surface resistance value of the high shock resistance type inflaming retarding antistatic polyvinyl chloride composition is less than 3*10<8> omega, and the shock strength is larger than 35KJ/m<2>. The invention provides the rigid polyvinyl chloride composition having inflaming retarding, permanent antistatic properties and high shock strength and being capable of keeping the antistatic properties under the condition of any humidity.

The invention discloses a chlorinated polyvinyl chloride tube stock and relates to the field of electric power instruments. The chlorinated polyvinyl chloride tube stock is prepared from the following raw materials in parts by weight: 75 parts of CPVC resins, 50 parts of PVC resins, 25 parts of light calcium carbonate, 12.5-15 parts of MBS resins, 8-10 parts of heat stabilizers, 1-2 parts of lubricants, 5-8 parts of chlorinated polyvinyl chloride, 2-5 parts of ACR processing agents and 0.5-1 part of molybdate red. The invention also discloses a preparation method for the chlorinated polyvinyl chloride tube stock. The preparation method comprises the following three steps: primarily mixing, blending and extruding. According to the preparation method provided by the invention, the formula of the tube stock is optimized; the dosage of the main raw material CPVC resin is less; compared with the traditional technique, the dosage of the CPVC resin is reduced by 30%; a compound toughening system is used for acquiring the tube stock with excellent performance the rigid-tough balance of the tube stock is realized; the shock strength, the tensile yield strength and vicat softening temperature of the tube stock are all at higher level; besides, the preparation technique is optimized, so that the performance requirement of the products meets the scheduled object and the product qualified rate and the productivity are both obviously increased.

The present invention relates to a polymer material, modified chlorinated polyvinyl chloride plastic. It consists of in weight ratio chlorinated polyvinyl chloride 100, polyvinyl chloride 2-160, composite lead stabilizer 4-12, methyl acrylate as shock modifier 2-14, partially oxidized polyethylene wax 0.05-0.9, active light CaCO3 0.05-80. It has excellent physical and chemical performance including chemical stability, heat resistance, corrosion resistance, fireproofing, shock strength, weather resistance and ultraviolet resistance. In addition, it has relatively lower cost, and may be used widely in producing various plastic products.

The invention relates to the technical field of polypropylene foam materials, in particular to a polypropylene anti-flaming foam material and a preparation method thereof. The polypropylene anti-flaming foam material is prepared from, by weight, 100 parts of polypropylene, 0.5-1.5 parts of foaming agent, 0.5-1.5 parts of nucleating agent, 3-6 parts of fire retardant, 0.5-1.5 parts of anti-flaming synergist and 1-2 parts of coupling agent. The fire retardant is formed by compounding magnesium hydroxide and tetrabromobisphenol A. The anti-flaming synergist is formed by compounding kieselguhr and antimonous oxide. The prepared polypropylene anti-flaming foam material is high in anti-flaming grade which can reach the grade V-0, the oxygen index reaches up to 39, the char yield reaches up to 35, processing fluidity is good, the char yield is high after burning, and no melted drop is generated. In conclusion, the prepared polypropylene anti-flaming foam material is high in shock strength, and the fire retardancy of the material is greatly enhanced while the mechanical performance of the material is improved. The preparation method has the advantages that the process is simple, and industrialization is easy.

The invention discloses a multi-phase polypropylene copolymer having a high ethylene-propylene rubber content. The multi-phase polypropylene copolymer comprises the following components in percentage by weight: 10-70% of propylene polymer matrix, 25-70% of ethylene-propylene random copolymer and 5-20% of ethylene-propylene block polymer. According to the invention, the multi-phase polypropylene copolymer has an ethylene-propylene rubber content of no less than 30wt%, and has excellent toughness and high shock strength (especially low-temperature shock strength). The invention also discloses a preparation method of the multi-phase polypropylene copolymer having a high ethylene-propylene rubber content. The preparation method combines propylene polymerization and gas phase ethylene-propylene copolymerization.

The present invention is halogen-free fireproof polystyrene composition with high shock strength and its preparation, and belongs to the field of polymer material. The composition contains polystyrene resin with high shock strength 70-90 wt%, fire retardant 5-25 wt% and machining assistant 0.5-5 wt%, and is prepared through high speed pre-mixing and once extrusion process. The composition has serial advantages of being fireproof, environment friendly, weatherproof, hot stable, high in mechanical performance, easy in machining, etc. It is suitable for use in display, video recorder, copying press, facsimile machine, printer, air conditioner, refrigerator, etc.

The invention discloses a chlorinated polyvinyl chloride modified material and a preparation method thereof. The chlorinated polyvinyl chloride modified material is prepared from the following components in parts by weight: 100 parts of chlorinated polyvinyl chloride resin, 1-5 parts of compound lubricating agent, 5-10 parts of complex heat stabilizer, 5-15 parts of filling agent, 5-20 parts of toughening agent, 3-10 parts of processing agent and 0.5-3 parts of pigment. The preparation method comprises the following steps of: weighing various components according to a recipe for later use; pouring the chlorinated polyvinyl chloride resin into a high-speed mixer to be mixed, then filling the complex heat stabilizer, adding the compound lubricating agent, the filling agent, the toughening agent, the processing agent and the pigment to mix until the temperature reaches 105 DEG C-120 DEG C, discharging and cooling; and melting and extruding the cooled mixed material, and hot cutting to obtain the chlorinated polyvinyl chloride modified material. Problems of large melt viscosity and difficult formation machining are overcome through chlorinated polyvinyl chloride modification, and the obtained product has high shock strength, good surface smoothness and high thermal stability.

The invention discloses low temperature resistant non-transparent high-impact random copolymerization polycarbonate, a preparation method and an application thereof. The random copolymerization polycarbonate is composed of a polycarbonate embedded section and a polysiloxane embedded section. The random copolymerization polycarbonate disclosed by the invention has excellent comprehensive property, excellent low temperature resistance and mechanical property, especially, high shock strength, better low-temperature shock strength, excellent processing property and practical application value.

The invention discloses a modified graphene/bismaleimide resin composite material and a preparation method thereof, and belongs to the technical field of the preparation of nanometer composite materials. The preparation method comprises the following steps: firstly preparing graphite oxide, then preparing modified graphene, and finally preparing a composite material according to 0.1-0.5wt% of modified graphene content in the composite material. The shock strength of the modified graphene/bismaleimide resin composite material disclosed by the invention is 19.557 to 26.171KJ/m<2>, and compared with the toughness of original bismaleimide resin, the toughness of the modified graphene/bismaleimide resin composite material is increased by 3.67% to 38.74%. The interfacial bonding property between the modified graphene and the bismaleimide resin is greatly improved, so that the toughness of the bismaleimide resin is improved, and the exertion of the property of the graphene is facilitated; compared with the toughness of the bismaleimide resin and a reduced graphene/bismaleimide resin composite material, the toughness of the modified graphene/bismaleimide resin composite material is greatly improved.