19results about How to "Retention strength" patented technology

The invention relates to the technical field of automobile plate materials, in particular to a composite automobile outer plate and a preparation method thereof.The composite automobile outer plate comprises a resin glass fiber laminated plate and a polypropylene outer layer which are hot-pressed together, a transition layer is arranged between the resin glass fiber laminated plate and the polypropylene outer layer, and a three-layer composite structure of functional layering and gradient transition is adopted; the performance bottleneck of a traditional single material is broken through, the total thickness of the three layers is 2.5-3.0 mm, the thickness of the three layers is equal to that of a traditional steel plate outer plate, but the weight is reduced by more than 70%, and the structural advantages of equal strength, half weight and controllable cost are achieved.

[Problem] One of the objects of the present invention is to provide a liquid addition-curable fluorosilicone composition that has a low compression set value after heating and curing, retains mechanical strength, and in particular, is suitably applied to injection molding. Further, the object of the present invention is to provide a fluorosilicone rubber obtained by heating and curing aforesaid composition, and a molded article of the fluorosilicone rubber. [Solution] An addition-curable fluorosilicone composition in a form of liquid at 23 °C, comprises (A) an organopolysiloxane represented by the following general formula (1) and having a viscosity at 25 °C of 100 to 500,000 mPa·s, wherein R1 is, independently of each other, a group selected from the group consisting of an alkyl group having 1 to 8 carbon atoms, an aryl group having 6 to 12 carbon atoms, and an aralkyl group having 7 to 12 carbon atoms, x is an integer of 1 to 10, m is an integer of 0 to 100, and n is an integer of 1 to 800, provided that 5 <= m + n <= 800; (B) an organohydrogenpolysiloxane having two or more hydrogen atoms each bonded to a silicon atom per one molecule, in an amount such that the number of hydrogen atoms bonded to a silicon atom in Component (B) is 0.5 to 10, per one vinyl group bonded to a silicon atom in Component (A); (C) an addition-reaction catalyst in a catalytic amount; and (D) a reinforcing silica filler agent, a surface of which being treated with an organosilicon compound represented by the following general formula (2): wherein R3 is, independently of each other, a group selected from the group consisting of an alkyl group having 1 to 8 carbon atoms, an aryl group having 6 to 12 carbon atoms, and an aralkyl group having 7 to 12 carbon atoms, R2 is, independently of each other, a group defined for R3 or a 3,3,3-trifluoropropyl group, provided that at least one R2 is a 3,3,3-trifluoropropyl group, and p is an integer that satisfies equation 1 <= p <= 20, in an amount of 10 to 60 parts by mass, relative to 100 parts by mass of Component (A).

The invention relates to the technical field of production of vacuum insulated panel core materials, in particular to a preparation method of a vacuum insulated panel core material, which comprises the following steps: cutting raw materials by using an airflow feeding type section cutting machine, opening and mixing filaments, carding to form a net, laying the net to form a felt, hot-pressing and shaping, and cutting. According to the preparation method provided by the invention, a dry process is adopted, so that severe hydraulic shearing and mechanical friction damage to fibers caused by wet pulping are avoided; the step of cutting off the raw materials is carried out by adopting the airflow feeding type section cutting machine, the to-be-cut ends of the glass fiber filaments are downwards suspended in a discharging cavity and are attached to structures such as a second feeding roller by utilizing airflow before cutting, cutting point drifting caused by curling and bending of the fibers is effectively avoided, and the cutting efficiency is improved by being matched with cutting of a cutting knife. The length of the short cut filaments is strictly controlled within a required range, the length distribution of the short cut filaments is concentrated, and the problem that the pore uniformity of the core material and the stability of the heat insulation performance of a final product are affected due to non-uniform length of the short cut fibers is solved.

This invention proposes a brazing method for aluminum alloys based on surface activation and a pre-placed Ni layer. The method includes: Step 1, pre-treating the aluminum alloy surface to be brazed to ensure it is dust-free and oil-free; Step 2, subjecting the aluminum alloy surface to ion bombardment to remove the oxide film and activate the surface; Step 3, depositing a Ni thin film on the aluminum alloy surface to form a pre-placed Ni layer; Step 4, assembling the aluminum alloys to be brazed and placing them in a vacuum brazing furnace, with the Ni layers of the two aluminum alloys in contact. Pressure is applied to ensure the upper and lower aluminum alloys are tightly bonded and to prevent relative sliding. The furnace is then vacuum-heated to 540℃~585℃ and held for a preset time before cooling to room temperature to obtain an aluminum alloy / Ni / aluminum alloy brazed joint. The joint obtained by this surface-activated, pre-placed Ni layer-based aluminum alloy brazing method has the characteristics of no oxide film at the interface, high tensile strength, and low deformation rate.

The invention relates to a polycarbonate composition with excellent flame retardant property. The polycarbonate composition comprises the following main components: 70 to 85 parts of polycarbonate, 13 to 28 parts of a polysiloxane-polycarbonate random copolymer, 0.3 to 0.6 part of an antioxidant, 0.2 to 0.6 part of a flame retardant, 0.5 to 0.8 part of an anti-dripping agent and 0.5 to 0.6 part of a lubricant. The preparation method comprises the following steps: putting the polycarbonate into a charging basket, sequentially adding the polysiloxane polycarbonate random copolymer, the antioxidant, the flame retardant, the anti-dripping agent and the lubricant, manually stirring, adding into a V-shaped mixer, uniformly mixing, and adding into a double-screw extruder bin; and starting a feeding screw to push the mixture into a double-screw extruder at a constant speed, carrying out melt extrusion molding, cooling, blow-drying, and granulating. The polycarbonate composition which is excellent in flame retardant property and easy to demould in the processing process can be widely applied to the application fields with higher requirements on flame retardant property, especially to the flame retardant application of cable wiring pipes, wiring boxes and the like.

The invention discloses a radiating core body for a tubular heat exchanger and a radiator. Comprising an end plate (1), connecting holes (2) are distributed in the end plate (1), and the connecting holes (2) are in expanded connection with a radiating pipe (3). High-pressure reliable sealing between the core body and the end plate of the aluminum alloy shell-and-tube heat exchanger is achieved.

The application discloses a multi-curvature optimized drag-reducing lateral thruster flow guide groove, and the opening (5) of the lateral thruster (1) is designed in the form of a horn-shaped flow guide groove (6). The application is based on the large-curvature characteristics of a ship line, and according to the water flow direction and the transverse gradient of the opening end, different chamfer angles are designed at different positions, multi-curvature transition and optimization are applied, and a multi-curvature optimized drag-reducing lateral thruster flow guide groove is designed. The application has the advantages that the cutting amount of the structure is reduced, the strength of the structure is retained, and the safety of the structure is ensured. According to the comparison of CFD software, under the specific speed working condition of the actual ship, the flow guide groove of the application reduces the pressure near the side thruster opening, and the overall ship resistance is reduced by 3.2%.

The invention relates to the technical field of textile production, in particular to ice comfortable fabric and a preparation method thereof. The ice comfortable fabric comprises the following components in percentage by weight: 40-60% of mica ice comfortable fiber, 20-30% of bamboo fiber and 20-30% of viscose acetal fiber, and the cross section of the mica ice comfortable fiber is a special-shaped cross section. The mica ice comfortable fiber, the bamboo fiber and the viscose fiber are blended to prepare the ice comfortable fabric which is silky, cool and excellent in moisture absorption and sweat releasing performance and drapability.

Provided is a polyamide core-sheath composite fiber comprising a sheath polymer formed from polyamide and a core polymer formed from polyether ester amide copolymer, wherein the core-sheath composite fiber has a strength of 3.6 cN / dtex or greater, a cross-sectional uniformity ratio d / R of the core-sheath component in the entire yarn of 0.072 or less, and an electrical specific resistance of 107 to 1010 Ω·cm. The provided polyamide core-sheath composite fiber has a humidity-absorbing property and an antistatic property, and while retaining strength, suppresses generation of fluff and has excellent high-order passability.

The invention discloses a coarse carbide reinforced ultra-fine grain laser cladding layer cutter and a preparation method thereof. A coarse carbide reinforced ultra-fine grain cladding layer is prepared on an M2 high-speed steel base material by using a pulse laser cladding three-layer process; the cladding of the three layers is that after the next cladding layer is solidified, the next cladding layer is cladded again under the same cladding condition until the cutter material with the three cladding layers is obtained; and the section of the cladding layer in the thickness direction serves as the rear tool face of the tool, and a chamfer is machined between the front tool face and the rear tool face. According to the method, the coarse carbide enhanced ultrafine grain cladding layer is prepared on the M2 high-speed steel base material by adopting a method of synchronously feeding powder and cladding three layers by pulse laser, so that the hardness and the wear resistance of the base material can be effectively improved. And the cladding layer matrix grains reach the submicron scale.

The invention discloses an atomizable biodegradable dust inhibitor, which comprises an effective component and an auxiliary agent, the effective component is a base material, the base material is composed of a chemical polymer material and a natural biopolymer material, and the chemical polymer material is polyvinyl alcohol, polyacrylate or polyethylene glycol; the natural biopolymer material is chitosan or xanthan gum; the mass percentage content of the effective components is 5-20%, the balance is the auxiliary agent, and the sum of the mass percentage content of the effective components and the auxiliary agent is 100%. The atomization effect of the dust inhibitor is achieved, formed liquid drops are small and uniform, dust can be evenly covered, a nozzle is prevented from being blocked, and the dust falling efficiency is improved.

This application relates to an aluminum alloy structural frame, comprising multiple connectors and multiple aluminum alloy beams and columns. Each connector has multiple sets of tenons. Both ends of each aluminum alloy beam and column have mounting holes for mates with the tenons. Each aluminum alloy beam and column is equipped with a pin. The surfaces of both the beams and columns and the tenons have pin holes for mates with the pins. The connectors are connected to the aluminum alloy beams and columns via the tenons and pins. This application employs a prefabricated tenon-to-mounting-hole interlocking mechanism, combined with the lateral locking of the pins, to achieve rapid positioning and installation. The reversible pin connection method offers greater detachability compared to bolt connections, allowing for the replacement of partial components without overall disassembly. The insertion of the pins is simple and much faster than tightening multiple bolts or welding, facilitating user replacement, saving time and effort, and improving installation and replacement efficiency.

The invention discloses a frame beam assembly welding method and a welding fixture, and relates to the field of frame beam assembly welding. The frame beam assembly welding method is as follows: S1, mechanical cleaning and chemical cleaning; S2, placing the automobile frame beam assembly on a welding platform for semi-automatic arc welding; S3, monitoring the welding process through an intelligent welding monitoring system; S4, cleaning the surface of the automobile frame beam assembly after welding; S5, performing quality inspection on the weld; S6, recording the inspection results, issuing an inspection report, and polishing and painting the weld according to the inspection report. The invention can solve the problems of unstable welding quality, difficult positioning, cumbersome operation and potential safety hazards in the welding process by mechanically cleaning and chemically cleaning the automobile frame beam assembly and then placing the automobile frame beam assembly on a welding platform for semi-automatic arc welding.

The low-temperature compact high-entropy alloy is characterized in that the molar ratio of Ti to Zr to Ta to Ni in the alloy is 1: 1: 1: (0.2-0.8). The preparation method of the high-entropy alloy comprises the following steps: (1) weighing Ti, Zr, Ta and Ni raw material powder according to a designed ratio, and uniformly mixing in a ball milling tank; (2) filling the uniformly mixed TiZrTaNix powder into a crucible, and compacting by vibration; and (3) carrying out vacuum sintering on the compacted TiZrTaNix mixed powder, and carrying out furnace cooling to obtain the low-temperature compact high-entropy alloy. The melting point of the alloy is greatly reduced through low-temperature eutectic reaction of the introduced component Ni, Ti and Zr, so that the sintering densification temperature of the alloy is reduced to 1300 DEG C or below.

The invention relates to use of selected materials in systems for heat treatment, various forms of such material, related systems and methods for determining such materials. In particular the invention relates to the use of a cover of analumina- chromium alloy material with a Cr content of more than 5w% (percent by weight) for one or more parts within a system suited for heat treatment.

The utility model relates to a movable shelf board of a wall protection board, which aims to solve the technical problem that the current wall protection board with a plane structure cannot be well externally assembled and lapped to form a storage space, and comprises a fastener and a movable board, wherein the fastener is in an inverted F shape, and a mounting cavity and a fastening cavity are sequentially formed in an axial gap in the fastener; and a plurality of mounting hole grooves are sequentially formed in the positions, opposite to the mounting cavities, of the surface of the fastener. The fastener can be freely installed on the wall protection plate through the pointed-tail bolt, meanwhile, the movable plate can be freely installed and connected to the fastener in cooperation with the buckling cavity, and the fastener and the movable plate can be freely matched with a cutting tool to be cut off; according to the bearing assembly, one or more fasteners and the movable plates can be freely assembled to form the required storage space according to the required size, so that the problem that an existing traditional wall protection plate does not have the storage space is effectively solved, assembly and disassembly are convenient, and personalized and high-freedom assembly and use are met.

The present invention belongs to the technical field of underground engineering support, and specifically discloses an underground engineering anchor net coupling energy absorption support system, including: a plurality of butterfly-shaped flexible connection nodes arranged on the support net, the butterfly-shaped flexible connection nodes include a breakable energy absorption structure arranged at the center position, and a plurality of flexible energy absorption connection structures arranged on the periphery of the breakable energy absorption structure; a plurality of ring-shaped nodes arranged on the support net, the ring-shaped nodes are arranged at the tray installation position, the anchor rods or anchor cables pass through the ring-shaped nodes, and are fixed by a rotating coupling energy absorption device; and / or, the ring-shaped nodes are arranged at the overlapping position of two support nets, and the two support nets are connected by an embedded mesh connection device. The various support components of the present invention are coupled with each other and jointly supported to form an underground engineering anchor net coupling energy absorption support system, which can give full play to the energy efficiency of each support component and realize efficient coupling energy absorption support.

The utility model discloses a fastener and offshore photovoltaic pull rod connecting system for offshore photovoltaic pull rod, fastener includes: the hoop, set up the first nut of hoop one end, set up the second nut of hoop other end, first nut and second nut inner wall all are equipped with with offshore photovoltaic pull rod cooperation's inner sleeve body, set up the notch on inner sleeve body, a kind of offshore photovoltaic pull rod connecting system, including: offshore photovoltaic pull rod and secondary purlin, secondary purlin is fixed through fastener, and structure glue is injected in the glue injection hole in the fastener. The utility model solves the corrosion and reliability problem that present offshore photovoltaic support pull rod faces, and pull rod surface has no anticorrosive coating, and fastener can be directly bonded with the pull rod body, to ensure the effectiveness and reliability of connecting node.

The utility model discloses a kind of pretreatment equipment for high-strength steel cable processing, it includes processing box, derusting box, cleaning tank and drying oven, the inside of the pretreatment box is provided with pretreatment cavity, fixed roller is rotated in the pretreatment cavity, three sector nozzles are fixedly connected in the both sides of the bottom of the pretreatment cavity, the bottom of the pretreatment cavity is provided with chute;The inside of the derusting box is provided with derusting cavity, inner cavity is provided in the derusting cavity, vibrator is fixedly connected outside the inner cavity, the inner cavity is filled with ceramic beads of specific particle size and hardness, and the abrasive made of ceramic beads is impacted and derusted by vibrator vibration, instead of traditional pickling process, while completely stripping the surface scale and rust layer of steel cable, the derusting mechanism can remove impurities in-depth steel cable gap, and no scratch is generated, the strength and tensile property of high-strength steel cable are completely retained, solve the problem of environmental hazards of chemical derusting.