20results about How to "Improve thermoplasticity" patented technology

The invention discloses a high-yield silicon-calcium cored wire and a preparation method thereof, and relates to the technical field of cored wires. Comprising the following steps: step 1, spraying composite powder on the surface of a calcium wire, and carrying out laser alloying to obtain an alloyed calcium wire; 2, the surface of the alloyed calcium wire is coated with the modified coating, and a core material is obtained; and 3, wrapping the surface of a core material with the composite powder, and pressing and drawing the core material with a steel sheet to obtain the silicon-calcium core-spun yarn. The core-spun yarn has the beneficial effects that the structure of the powder in the core-spun yarn is improved, and the modified coating is introduced to the surfaces of the powder and the alloyed core material, so that the high-temperature resistance of the internal calcium wire is improved, the position of the whole core-spun yarn in molten steel is convenient to control, and the purification effect on the molten steel is improved. And meanwhile, the durability and thermoplasticity of the steel are enhanced to a certain extent.

The present invention discloses a thermoplastic polyimide resin and a preparation method thereof, wherein the preparation method of the thermoplastic polyimide resin comprises the following steps: S1, mixing a dianhydride monomer with a polar solvent, adding a diamine monomer, stirring, and obtaining a polyamic acid solution; S2, adding an organic base to the polyamic acid solution, adding a dehydrating agent, stirring, adding the reaction solution to an alcohol solvent to precipitate a precipitate, collecting the precipitate, washing, and drying, and obtaining a thermoplastic polyimide resin. The diamine monomer is a large sterically hindered biphenyl diaryl ether diamine monomer. The present invention introduces a twisted non-coplanar biphenyl diaryl ether skeleton to reduce the intermolecular stacking density, thereby effectively improving the T of the thermoplastic polyimide resin. g , T m and melt fluidity, effectively improving the melt processing performance of the material.

The present invention relates to the technical field of layered products, specifically to a multi-layer moisture-absorbing and warm-keeping velvet comfort layer and a preparation method thereof, including forming a hemp fiber laminate; forming a hollow fiber laminate; placing the hollow fiber laminate on the hemp fiber laminate, performing a needle-punching treatment, melting in an oven, cooling and finalizing, to obtain a fiber composite layer composed of a hemp fiber composite layer and a hollow fiber composite layer; trimming the fiber composite layer and placing it in a rectangular enclosure, then pouring glue into the rectangular enclosure, and after the glue is evenly spread on the surface of the fiber composite layer, heating and curing, forming a high-elastic cotton layer on the surface of the fiber composite layer, taking out, fine trimming, and opening air holes, to obtain a moisture-absorbing and warm-keeping velvet comfort layer. The comfort layer in the present invention is a composite layered product composed of a hemp fiber composite layer, a hollow fiber composite layer and a high-elastic cotton layer, so that the comfort layer has good elasticity, excellent air permeability and warmth retention, and good antibacterial properties.

The present invention provides a method for improving the thermoplasticity of a hard-to-deform nickel-based powder high-temperature alloy, which solves the technical problem of the difficulty in processing the hard-to-deform nickel-based powder high-temperature alloy. The method steps of the present invention are: (1) determining the full melting temperature Ts of the γ′ phase of the hard-to-deform nickel-based powder high-temperature alloy, and obtaining the preheating temperature T1 as (Ts‑30)‑(Ts‑20)°C; (2) keeping the hard-to-deform nickel-based powder high-temperature alloy at the preheating temperature T1 for a time t; (3) cooling the hard-to-deform nickel-based powder high-temperature alloy in step (2) to 500‑1000°C at a slow cooling rate of 0.8‑1°C / h; (4) air cooling to room temperature, controlling the precipitation of harmful phases, and obtaining a nickel-based powder high-temperature alloy with a locally curved grain boundary and containing a coarse γ′ phase. The present invention can be widely used in the field of material processing technology.

The present invention discloses a hydrophobic thermoplastic polyimide resin and a preparation method thereof, and the preparation method comprises the following steps: S1, mixing a dianhydride monomer with a polar solvent, adding a diamine monomer, stirring, and obtaining a polyamic acid solution; S2, adding an organic base and a dehydrating agent to the polyamic acid solution, heating, stirring, adding the reaction solution to an alcohol solvent to precipitate a precipitate, collecting the precipitate, washing, and drying to obtain a hydrophobic thermoplastic polyimide resin. By introducing a fluorinated alkyl group, the hydrophobicity and various properties of the thermoplastic polyimide resin are effectively improved; relative to the existing method of coating a hydrophobic coating on the surface of polyimide or constructing a micro-nano structure, the technical solution of the present invention avoids the reduction of structural strength caused by doping, and while improving the hydrophobicity of the polyimide, a longer hydrophobic period can be maintained. By introducing a long-chain fluorinated alkane and introducing a large number of fluorine atoms, the water contact angle can reach more than 120°, showing excellent hydrophobicity.

The application discloses an economical boron-containing stainless steel for hot neutron absorption, which comprises the following steps: (1) component design; (2) smelting molten steel according to the set component in a vacuum environment, applying electromagnetic stirring in a smelting process, and carrying out casting under a nitrogen protection atmosphere to obtain a casting blank; (3) homogenizing heat treatment of the casting blank for 240-720 min between Ac3 and the melting point of boride (T f ); air cooling to room temperature after discharging; (4) after removing casting defects, inclusions and slag foreign matters by grinding the casting blank after heat treatment, carrying out hot deformation and solid solution treatment; the hot deformation heating temperature and the solid solution treatment temperature are respectively T f 10-80 DEG C and 30-100 DEG C. The application is aimed at the characteristics of high cost and poor hot plasticity of the traditional boron-containing stainless steel for hot neutron absorption, reduces the use of precious metal Ni, improves the hardness of the matrix structure, enhances the deformation coordination of the matrix and boride, greatly improves the hot plasticity, and improves the hot deformation capacity of the material.

The invention discloses a continuous fiber reinforced polyimide structure type core material composite material and a 3D printing method thereof.The method comprises the steps that firstly, a polyamide acid salt solution is adopted for preimpregnation of continuous fiber tows, and continuous fibers are transferred to a printing nozzle for printing of a continuous fiber layer; the viscosity of the polyamide acid hydrogel is adjusted, the extrusion amount of glue solution printing is adjusted, a core material printing path is adjusted in combination with a 3D printing control system, volatile solvents in resin are removed through an external heat flow source, partial curing of the resin is completed, and a polyimide structure type core material preformed body is printed in a sizing mode; and finally, obtaining a continuous fiber reinforced polyimide structure type core material composite material preform by adopting a 3D printer, and heating and curing to obtain the continuous fiber reinforced polyimide structure type core material composite material. The composite material has the characteristics of excellent heat resistance, mechanical corrosion resistance and chemical corrosion resistance, good printing quality and high working efficiency, and is suitable for the fields of aerospace, automobiles, ships, semiconductors and the like.

The ultrahigh-pressure hydraulic riveting tool comprises a riveting clamping jaw and a riveting anvil which are driven by a hydraulic oil cylinder, and an oil cylinder body is composed of an outer-layer alloy cylinder body and an inner-layer alloy cylinder body; the inner-layer alloy cylinder body and the outer-layer alloy cylinder body are combined through interference nesting to form an oil cylinder body barrel of an integrated structure; in the interference joint surfaces of the inner-layer alloy cylinder body and the outer-layer alloy cylinder body, the side wall joint surface is of a linear cylinder joint surface structure, the front end joint surface is of a plane annular joint surface structure arranged in the radial direction, and an arc ring transition joint surface structure is arranged between the side wall joint surface and the front end joint surface. The double-layer cylinder body nesting combination mode is adopted for the first time, and the stress distribution of the cylinder body in a high-pressure state is more uniform due to prestress generated by extrusion and diameter expansion in the nesting combination process; the alloy material cylinder body has good forming performance, can be processed in multiple modes such as hot processing and liquid nitrogen cold processing, has high thermoplasticity and low plastic strain hardening index, and can effectively avoid fracture of the cylinder body.

The utility model relates to a medical chest fixing plate, and relates to the technical field of medical instruments. The protective plate comprises a base plate and a protective plate body, the base plate body is made of PE materials, the protective plate body is made of TPE materials, the base plate body and the protective plate body are bonded through injection molding, the periphery of the protective plate body extends to form a turned-over edge wrapping the edge of the base plate body, a plurality of connecting columns arranged at intervals in the outer contour direction of the turned-over edge are arranged on the side, opposite to the turned-over edge, of the protective plate body, and all the connecting columns penetrate through the base plate body. The overall weight of the fixing plate can be reduced, and the influence on X-ray shooting is reduced.

The invention discloses a high-performance anti-aging thermoplastic colloidal particle, which is prepared from the following raw materials: a polyethylene resin base material, a stabilizer, a plasticizer, an anti-aging agent and a modifier, the stabilizer and the plasticizer are added into the polyethylene resin base material for stirring, heating and mixing, and the mixture raw material is extruded by an extruder, cooling and bracing the mixture raw materials through a water tank, cutting the bracing into particles, adding an anti-aging agent and a modifier, stirring, heating and mixing again, extruding through an extruder, cutting again into particles, dehydrating the particles through a dehydrator, cooling colloidal particles through a vibrating screen, and screening qualified products through the vibrating screen. Qualified products are stirred and dried through the stirring barrel. According to the high-performance anti-aging thermoplastic adhesive, the raw materials and the additives are mixed twice for cooling, bracing and granulation, the oxidation resistance, stability, aging resistance, heat resistance and wear resistance of the adhesive particles are improved, and therefore the prepared high-performance thermoplastic adhesive particles are beneficial to the quality of automobile production.

The invention relates to the technical field of flame retardance, and discloses a montmorillonite grafted flame retardant modified polystyrene composite material, polystyrene is intercalated into a nano montmorillonite structure in a molten state and is uniformly distributed in a matrix, so that the mechanical property and heat resistance of polystyrene are improved, and when the matrix is burnt, the flame retardancy of polystyrene is improved. Montmorillonite is gradually enriched on the surface of a matrix, a certain blocking effect is generated on interlayer macromolecules, the speed of external oxygen and heat transferring to the interior is reduced, a compact carbon layer is formed, volatile matter is reduced, the good smoke suppression and flame retardant effects are achieved, phosphorus forms the compact carbon layer on the surface of the matrix, and the flame retardant effect is good. The nitrogen element forms incombustible gas, the concentration of oxygen in a reaction system is reduced while polystyrene decomposition is inhibited, the combustion reaction is slowed down, the nitrogen element is uniformly dispersed in a polystyrene matrix, and the obtained composite material has excellent flame retardant property.

The invention discloses an alloy material for an electromagnetic valve body and a preparation method, and the alloy material comprises the following components in percentage by weight: 0.010 to 0.025 percent of C, 0.50 to 1.50 percent of Si, 0.10 to 0.30 percent of Mn, 0.010 to 0.030 percent of P, 0.020 to 0.030 percent of S, 17.0 to 19.0 percent of Cr, 0.30 to 0.80 percent of Ni, 2.0 to 2.5 percent of Mo, 0.10 to 0.30 percent of Al, 0.02 to 0.05 percent of Ti and the balance of Fe. The alloy material is good in thermoplasticity, not prone to cracking in the deformation process and capable of being formed through forging and pressing after electric heating upsetting, the grain size of the material in the hot forming process is improved, and the coercive force, the elastic limit, the yield point, the tensile strength and other parameter indexes of the alloy material are all good.

The invention provides self-repairing TPU (thermoplastic polyurethane) optical resin as well as a preparation method and application thereof. According to the self-repairing TPU optical resin disclosed by the invention, dithio diethylene glycol is deliberately selected as a cross-linking agent to introduce a dynamic disulfide bond, so that a material network is endowed with dynamic reversibility; meanwhile, a thiocarbamate bond and a dynamic metal coordination bond are introduced to a polyurethane main chain, the multi-dynamic bond action mechanism breaks through the bottleneck of low self-repairing efficiency of a single dynamic bond in the past, and on the basis of ensuring the mechanical strength performance under the normal temperature condition, the material can be effectively repaired when being subjected to microscopic damage, so that the self-repairing efficiency of the material is greatly improved. And the exchange reaction of covalent hydrogen bonds and disulfide bonds can be triggered through external stimulation, so that the self-repairing of the damaged part is realized, the anti-scraping performance of the optical element is remarkably improved, and the service life is prolonged. The TPU optical resin provided by the invention has high-efficiency self-repairing performance, is recycled and regenerated, and realizes performance balance among high refractive index, low dispersion and mechanical strength.

The invention relates to a production process for preparing a packaging box by using waste textiles. The production process comprises the following steps: S1, crushing and dicing the waste textiles; s2, the waste textiles are infiltrated by ethylene glycol for not less than 15 minutes, the waste textiles are opened into short fibers of 15-100 mm, and the waste glass fibers are cut into short glass fibers of 15-100 mm; s3, short fibers and short glass fibers are mixed according to the ratio of (1-8): 1, and a mixed material is obtained; s4, feeding the mixed material to a lapping machine, and forming a net on a non-woven fabric base material to obtain a mixed material net; s5, feeding the mixed material net into a needling machine to obtain a needled felt; and S6, performing hot melting on the needled felt by using an oven, closely observing an infiltration reaction, and when thermal shrinkage deformation reaches 30% or above, quickly transferring the needled felt to a hot-pressing mold for molding to obtain a finished product. According to the production process, the polyester fibers in the waste textiles are used as a thermoplastic matrix, the waste glass fibers are used as reinforcing fibers, other fibers are used as gap materials, no other low-melting fibers or resin materials need to be added in the processing process, and the manufacturing cost and the energy consumption are greatly reduced.

The invention relates to the technical field of negative electrode materials, in particular to a binary magnesium alloy negative electrode material and a preparation method and application thereof, the binary magnesium alloy negative electrode material comprises Mg and Dy, and the content of Dy is that the total content of inevitable impurity elements does not exceed the total content of the inevitable impurity elements, and the balance is Mg. The preparation method comprises the following steps: weighing raw materials according to the component proportion of the binary magnesium alloy negative electrode material, wherein the raw materials comprise pure Mg and Mg-Dy intermediate alloys; the weighed raw materials are smelted and poured, and cast ingots are obtained after air cooling solidification; and the cast ingot is sequentially subjected to solution treatment, extrusion treatment, rolling treatment and annealing treatment, and the binary magnesium alloy negative electrode material is obtained. While low cost and environmental friendliness are maintained, excellent cycling stability and low overpotential are achieved.

The invention discloses a production technology of an inconel bar. The production technology comprises the following steps that firstly, a 1T vacuum induction furnace is used for smelting, and an electrode bar is cast; step 2, preparation before electroslag remelting; the method comprises the steps of electrode bar surface treatment, dummy ingot block welding and slag material preparation. Step 3, electroslag remelting; fourthly, after the electroslag ingot is completely cooled, the dummy ingot plate needs to be subjected to gas cutting along the bottom diameter; fifthly, cogging is conducted, and upsetting and drawing forging comprises the first heating number and the second heating number; 6, drawing-out forging comprises a third heating number and a fourth heating number, the total deformation of the third heating number is controlled to be 35-45%, and the total deformation of the fourth heating number needs to be larger than or equal to 50%; and seventhly, the bar is subjected to solution annealing. According to the method, the bar meeting the standard requirement is obtained through the low-cost technological process, more uniform equiaxed grains are obtained through the process under the same process, the machining time is shortened while the excellent and beneficial performance is guaranteed, and annealing twin crystals are reduced by adjusting the annealing temperature and time.

The present invention relates to the technical field of additive manufacturing, and in particular to a spherical high-temperature alloy powder for additive manufacturing and a preparation method thereof. The spherical high-temperature alloy powder for additive manufacturing of the present invention comprises the following raw material components by weight percentage: Cr 12-14%, Co 8-9%, Al 3.8-4.2%, Ti 3.8-4.2%, W 2.4-2.8%, Ta 1.9-2.1%, Mo 1.6-2.0%, Nb 1.0-1.2%, Fe 0.1-5.0%, doped Si3N 4 0.2‑1%, C 0.08‑0.12%, Mn≤0.02%, Zr<0.03%, and the balance is Ni and impurity elements. By introducing Sr and Tb elements into the matrix, it has excellent durability, hot working performance and thermoplasticity under high temperature conditions, which can make the subsequent processing of the high-temperature alloy simpler, expand the application field, and has broad application prospects and significant impact significance.

The utility model discloses a battery bottom support, including battery bottom support body, set up on the battery bottom support body's exhaust hole and set up on the battery bottom support body's a plurality of bosses, the exhaust hole is used for discharging the gas of battery inside generation, the boss is used for placing the core of stacking, the boss top surface protrudes at the battery bottom support body bottom surface, when the core of stacking is placed in the boss top surface, and the clearance is formed between the core of stacking bottom surface and the battery bottom support body bottom surface, so that the core of stacking bottom surface is deformed and blocks the exhaust hole and influences the outward exhaust during the battery thermal runaway test process.

The application belongs to the technical field of thermoplastic polyester imides, and particularly relates to a biphenyl-bridged thermoplastic polyester imide, a preparation method thereof, a biphenyl-bridged thermoplastic polyester imide film and application. The biphenyl-bridged thermoplastic polyester imide is polymerized from biphenyl diphenylate-3,3',4,4'-tetracarboxylic dianhydride, 3,3',4,4',-biphenyl tetracarboxylic dianhydride and 2-(4-aminobenzoate)-5-aminobiphenyl. The biphenyl-bridged thermoplastic polyester imide provided by the application has a linear thermal expansion coefficient close to that of copper foil, and excellent thermoplasticity, high-temperature dimensional stability and dielectric properties.

This invention belongs to the field of alloy processing technology, specifically relating to a method for forming titanium alloy bars with increased Nb, Ti, and Al content in the matrix. The method involves melting an ingot, controlling the following components: P ≤ 0.015%, S ≤ 0.015%, Si ≤ 0.2%, Mn ≤ 0.2%, 5.2% ≤ Nb + Ta ≤ 5.5%, and 1.5% ≤ Ti + Al ≤ 1.8%. After forging, the ingot is heat-treated at an initial temperature ≤ 500℃, then heated to 580–620℃. The ingot is then machined, with roughing speeds of 50–60 r / min and finishing speeds of 60–80 r / min. Finally, a shot-strengthening treatment is performed to obtain the titanium alloy bar. This invention, based on the control of impurity elements and compositional segregation during the melting process, coupled with stress-relieving heat treatment after forging, low-stress cutting, and surface strengthening treatment, achieves tensile strength and yield strength that are more than 100 MPa higher than conventional standards.