80results about How to "Good impact resistance at low temperature" patented technology

The invention relates to a polycarbonate/polyester composition and a preparation method thereof. The composition comprises the following components by wt%: 50-80wt% of polycarbonate, 10-30wt% of polybutylene terephthalate (PBT), 5-15wt% of toughening agents, 1-5wt% of functional agents, 0.1-1wt% of antioxidant and 0.1-2wt% of lubricants. The method comprises the following steps: proportioning according to the components, then proportionally charging the PBT and the functional agents into a high mixing machine to be premixed and carrying out extrusion pelletization on the premixed materials in an extruder to obtain functional master batches; and then fully mixing the rest components with the master batches in the high mixing machine and then carrying out extrusion pelletization on the mixture in a double-screw extruder to obtain the product. Compared with the prior art, the composition has excellent resistance to chemicals and low temperature impact resistance and simultaneously improves the mechanical properaty of the materials.

The invention discloses a polyamide composition of high impact thick-walled product, which comprises the following parts: a) 1-99wt% polyamide resin, b) 0. 5-40wt% thermoplastic elastomer of olefin copolymer, c) 1-95wt% phenylethene resin, d) 0. 05-60wt% modified ethylene copolymer with alpha, beta-unsaturated fatty acid anhydrides or its deritative, or e) 0. 05-60wt% modified ethylene copolymer with alpha, beta-unsaturated fatty acid. The invention can keep original superior strength, fluidity and low-temperature shock resistance of thin-walled product, which confers superior shock resistance for thick-walled product.

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 invention belongs to the field of steel smelting, and particularly relates to titaniferous high-chromium weathering resistant steel and a rolling method thereof. The titaniferous high-chromium weathering resistant steel comprises, by weight, smaller than or equal to 0.07% of C, smaller than or equal to 0.50% of Si, smaller than or equal to 1.5% of Mn, smaller than or equal to 0.02% of P, smaller than or equal to 0.10% of S, 0.20%-0.55% of Cu, 3.00%-5.50% of Cr, 0.10%-0.65% of Ni, 0.04%-0.10% of Ti, and the balance Fe and inevitable impurities. The weathering resistant steel and a preparing method thereof have the beneficial effects that the production cost is low, the technology is simple, the product yield is high, and the comprehensive performance of the weathering resistant steel is superior. The requirement of the existing industry for high weathering resistance of the weathering resistant steel can be met, the requirement for stable mechanical performance of steel can also be met, and especially superior low-temperature impact resistance and good ductility are achieved.

Disclosed is a catalyst for olefin polymerization composed of a crosslinked metallocene compound (A-1) represented by the general formula [1-1] below and at least one or more compounds (b) selected from organic aluminum oxy compounds (b-1), compounds (b-2) forming an ion pair, and organic aluminum compounds (b-3). [1-1] (In the general formula [1-1], R<1>, R<2>, R<3>, R<4>, R<5>, R<8>, R<9> and R<12> respectively represent one selected from a hydrogen atom, a hydrocarbon group and a silicon-containing group; R<6>, R<7>, R<10> and R<11> are not hydrogen atoms and respectively represent one selected from a hydrocarbon group and a silicon-containing group; R<13> and R<14> respectively represent a hydrogen atom, a hydrocarbon group other than a methyl group or the like; M represents Ti, Zr or the like; Y represents carbon or the like; Q represents a halogen or the like; and j represents an integer of 1-4.

The invention relates to a sun-proof composite modified polypropylene pipe for power cable protection. The pipe comprises the following components in percentage by weight: 73 to 78 percent of PP (Propene Polymer), 10 to 15 percent of POE (Polyolefin Elastomer), 4.8 to 5.2 percent of nano calcium carbonate, 0.3 to 0.4 percent of nucleating agent, 0.2 to 0.25 percent of coupling agent and 0.5 to 1 percent of sun-proof lubricating composite functional master batch. Not only does the pipe have better low-temperature impact resistance, wherein impact energy in a falling weight impact test at a temperature of minus 5 DEG C is improved by over 2.5 times, the friction coefficient is reduced by 40 percent and the Vicat heat-resistance temperature is risen by 5 DEG C, but also sun-proof performance of the pipe is improved and the application range of the power pipe is enlarged.

The invention discloses a wearable ultrahigh molecular weight polyethylene tubular product and a preparation method thereof, belonging to a composite of macromolecular compounds, and comprising the following raw material components in parts by weight: 95-98 parts of ultrahigh molecular weight polyethylene with viscosity-average molecular weight of 2800,000-2850,000, 1.8-4.8 parts of polyethylene wax with molecular weight of 1,000-1,500, and 0.1-0.3 part of carbon black. The invention provides the wearable ultrahigh molecular weight polyethylene tubular with performances of corrosion resistance, anti-adhesion, compression resistance, impact resistance, high surface hardness, good abrasion resistance, high mechanical strength, high heat distortion temperature, convenient process, long service life and low manufacture cost, and a preparing method thereof with simple manufacturing process and low production cost. As the substitute of steel tubes, the invention meets the market requirements, overcomes the defects of poor performances of corrosion resistance, abrasion resistance and anti-adhesion in the prior steel tubes, and is widely applied to the transportation of wastewater, waste residue and corrosive medium in the industries such as metallurgy, electric power, paper-making, chemical industry, machine, petroleum and the like.

The invention provides a hot melt adhesive for an acrylic hot-fix rhinestone. The hot melt adhesive comprises the following components by weight: 10 to 15 parts of EVA resin with the VA content of 28% and the MI of 150 g/10min, 0 to 35 parts of EVA resin with the VA content of 28% and the MI of 6 g/10min, 4 to 12 parts of thermoplastic polyurethane with Shore D hardness of 70, 30 to 40 parts of styrene modified C5 petroleum resin, 10 to 20 parts of polyethylene wax, 2 to 6 parts of EBA3427AC and 1 to 2 parts of an antioxidant 1010. The hot melt adhesive for the acrylic hot-fix rhinestone provided by the invention has a hot-press temperature of 115 to 120 DEG C, is not prone to scalding the acrylic hot-fix rhinestone and fabrics, and has peeling strength of no less than 4.0kN/m , thereby having high bonding strength at the same time; meanwhile, the hot melt adhesive has the advantage of good adhesive force with a variety of fabrics and acrylic hot-fix rhinestones, and is an ideal hot melt adhesive for the acrylic hot-fix rhinestone.

The invention discloses a thermal conductive plastic alloy used for a radiator, a radiator and a preparation method. The thermal conductive plastic alloy comprises polybutene or polyisobutene, polyethylene, graphite powder, carbon fiber, thermal conductive carbon black, a thermal conductive reinforcing agent, a titanate coupling agent and stearic acid. The thermal conductive plastic alloy is subjected to granulation, then pipe drawing and injection molding are carried out, an inner water channel pipe and a connecting piece of an radiator are prepared, the inner water channel pipe is expanded into an inner hole of an aluminum wing pipe of the radiator to obtain a radiator column material or sheet material, the column material or the sheet material and the connecting piece are subjected to sweat soldering to prepare a radiator single sheet, and finally the radiator single sheets are subjected to sweat soldering to compose a radiator. The thermal conductive plastic alloy and the radiator are advantaged by good environmental protection and excellent heat radiation performance, are stable and durable, and have protruding characteristics of no fouling, no rusting, no corrosion, no cracking, no pollution, no deformation, no abnormal sound and no aging.

The invention belongs to the field of high molecular material synthesis and particularly relates to a low-temperature-resisting high-impact-resistance PVC modifying agent. The low-temperature-resisting high-impact-resistance PVC modifying agent is of a core-shell structure, the internal of the structure is an acrylate rubber core, and the external of the structure is a methyl methacrylate shell. The modifying agent can improve the toughness of PVC products, still keep the good impact resistance strength even in a low-temperature environment, improves the fluidity, thermal deformation and weatherability of PVC melts and the surface gloss of the products. The invention further provides a preparation method of the modifying agent. The preparation method comprises the steps that deionized water, an expanding agent, an emulsifier, a soft acrylic ester monomer, a crosslinking agent and an initiator are added into a reactor, and acrylate seed latex is obtained through rection; a part of the acrylate seed latex is taken, the soft acrylic ester monomer is added, a core-layer latex is obtained through reaction, a hard acrylic ester monomer is added into the core-layer latex, high-impact-resistance modifying agent latex is obtained after reaction, and the low-temperature-resisting high-impact-resistance modifying agent is obtained after the latex coagulates and is dehydrated and dried. The raw materials of the modifying agent are easy to obtain, a process is simple and easy to operate, and the modifying agent is pollution-free to the environment and is convenient to use.

The invention discloses a gypsum slip casting mold. The gypsum slip casting mold comprises a first half mold body (2) forming a first cavity (1) and a second half mold body (4) forming a second cavity(3). The first cavity (1) and the second cavity (3) are matched to form a cavity for gypsum injection. At least one first containing cavity (5) is formed inside the first half mold body (2). At leastone second containing cavity (6) is formed inside the second half mold body (4). Permanent magnets are arranged in the first containing cavities (5) and the second containing cavities (6). The materials of the first half mold body (2) and the second half mold body (4) are ABS resin and nanometer zeolite powder composite materials. The effects of good use performance, convenient demolding, good water absorption performance, simple and convenient processing and great reduction of production cost are realized.

The invention discloses a high-impact-strength ABS material used at -40 DEG C and a preparation method thereof. According to the method, by mass, 50-80 parts of ABS, 5-20 parts of a toughening agent, 5-20 parts of a cold-resistant modifying agent, 3-10 parts of compatilizer and 0.5-3 parts of a lubricating agent are added into a double-rotor continuous mixing mill to be subjected to melt mixing granulation, mixing temperature ranges from 170 DEG C to 200 DEG C, and the high-impact-strength ABS material used at -40 DEG C is obtained. The high-impact-strength ABS material used at -40 DEG C has excellent low-temperature anti-impact performance and still has excellent anti-impact performance especially at -40 DEG C, the normal-temperature elongation at break is high, and the high-impact-strength ABS material used at -40 DEG C can be used outdoors in a severe-cold environment.

The invention discloses a thermal insulation thermoplastic composite material for a roadbed. The material comprises an upper layer, a middle layer and a base layer in sequence from up to bottom, wherein the upper layer and the base layer are bonded, combined and pressed through the middle layer, the upper layer is thermoplastic composite material; the middle layer is a bonding layer and the base layer is thermal insulation material. According to the invention, the thermal insulation thermoplastic composite material adopts the thermoplastic composite material as the upper layer, so that the intensity and the rigidity of the whole material are provided and more importantly the shock resistance performance which is far better than that of a common thermal insulation material is provided; the base layer is the thermal insulating layer and connected through the bonding layer, so that material of which the bonding performance is poor between the upper layer and the base layer has good bonding intensity; the thermal insulation thermoplastic composite material is mainly applied for thermal insulating of roadbeds of highways and railways in plateau areas or cold areas.

The invention relates to the technical field of power cable production, in particular to a connecting structure and a manufacturing method of a composite polypropylene GHFB square high-voltage cable. According to the technical scheme, pipe material bodies are included, the inner wall and the outer wall of each pipe material body are both in a corrugated shape, the two pipe material bodies are connected through a sealing ring and a clamping hoop, one end of each of the two pipe material bodies is connected into the sealing ring, the clamping hoop is arranged on the outer layer of the sealing ring in a sleeved mode, and the width of the clamping hoop is at least the width of the wave crests of three ripples of the pipe material bodies. The connecting structure has the advantages of being good in insulation performance and good in connecting sealing performance, great low-temperature shock resistance is achieved, meanwhile, materials are the lightest in all ground burying pipe materials, and conveying cost and mounting type hoisting cost can be greatly lowered.

The invention discloses a PBT/PC/ASA composite material, which comprises the following components by weight: 30-50 parts of PBT resin; 10-15 parts of PC resin; 5-10 parts of ASA resin; 10-30 parts ofspecial glass fiber; 4-10 parts of glass bead; 3-7 parts of a compound low temperature toughening agent; 0.1-0.8 part of an antioxidant; and 0.1-0.5 part of a lubricant. The invention also discloses apreparation method of the PBT/PC/ASA composite material. The ternary composite material prepared by the method provided by the invention has the characteristics of low molding shrinkage and warpage resistance, and also can maintain good impact toughness in a low temperature environment.

The invention relates to a food heat-preservation and delivering box which comprises a box body, wherein a pair of hasps is arranged on each of the two long sides of the box body; a cross slot for allowing an electronic identification card to be inserted is formed in each of the two sides of the box body; a slot for allowing a menu holder to be inserted is formed below each cross slot; the hasps are buckled to connect a top opening of the box body with an upper box body cover; a sealing ring is arranged at the bottom of the upper box body cover, and a plurality of clamping grooves for placing soup ladles are formed in the middle of the upper box body cover; a pressure balancing valve for balancing the inner and outer pressure difference of the heat-preservation box body is arranged on the upper box body cover; a plurality of dishes are arranged in the box body. The food heat-preservation and delivering box can be widely used for field catering.

The invention discloses a modified polyethylene corrugated pipe and preparing method thereof. The modified polyethylene corrugated pipe is made of modified polyethylene material which comprises, by weight, the following raw material: 300-320 parts of polyethylene, 40-50 parts of polypropylene, 15-25 parts of polytetrafluoroethylene, 10-12 parts of calcium stearate, 16-22 parts of carbon black, 30-40 parts of EVA resin, 24-28 parts of sodium silicate powder, 36-42 parts of maleic anhydride. The modified polyethylene corrugated pipe has relatively high heat distortion temperature, comparatively good low-temperature impact resistance performance, and can be used in the environment of -20-80oC for a long time. The modified polyethylene corrugated pipe also has excellent flame retardance and electrical insulation.

The invention discloses a polypropylene corrugated pipe composite material, which comprises the following raw material components in parts by mass: 50-70 parts of polypropylene, 10-20 parts of a butylbenzene transparent impact-resistant resin, 5-15 parts of ultra-high molecular weight polyethylene, 1-10 parts of a low-melting-point dispersing agent, 5-15 parts of a high-fluidity resin and 5-15 parts of a compatibilizer. According to the polypropylene corrugated pipe composite material provided by the technical scheme, the polypropylene corrugated pipe is prepared by compounding a plurality ofraw materials, so that the prepared polypropylene corrugated pipe has the characteristics of high strength, strong heat resistance and good low-temperature impact resistance at the same time. The invention further provides a preparation method of the composite polypropylene corrugated pipe prepared from the polypropylene corrugated pipe composite material, wherein the operability is high, and theprocessing fluidity and the compatibility during the preparation of composite polypropylene corrugated pipes can be improved.