44results about How to "High tensile strength" patented technology

The invention relates to a high-toughness and corrosion-resistant aluminum alloy profile for aerospace and a preparation method thereof. The problem that an existing aluminum alloy profile can not meet the use requirements of aerospace is solved. The aluminum alloy profile is made from smelting raw materials including Cu, Mg, Zn, Zr and Al, and the aluminum alloy profile made from an aluminum ingot, cathode copper, a primary magnesium ingot, a zinc ingot and an aluminum zirconium alloy ingot by smelting, casting, homogenizing annealing, hot extrusion, quenching, drawing and aging. According tothe high-toughness and corrosion-resistant aluminum alloy profile for the aerospace and the preparation method thereof, by optimizing of alloy composition, controlling of ingot casting quality, multi-stage homogenizing treatment technology, extrusion molding technology, and two-stage quenching and three-stage aging technology of strengthening-toughening heat treatment, the high-toughness and corrosion-resistant aluminum alloy profile is produced, the residual stress of the profile is effectively reduced by increasing the tension straightening quantity, and the subsequent machining precision of the profile is improved. The high-toughness and corrosion-resistant aluminum alloy profile for the aerospace is applied to the field of aluminum alloy profile preparation.

The invention relates to a method for preparing temperature-resistant high-molecular elastic leakproof rubber capable of enhancing the safety property of an automobile tyre. The temperature-resistant high-molecular elastic leakproof rubber is prepared from the following raw materials in percentage by weight: 42%-62% of thermoplastic elastomers, 34%-54% of thickening agents, 3%-8% of plasticizing agents, 0.5%-1.5% of antioxidants, 0%-1% of cross-linking agents, 0%-15% of filling agents and 0%-3% of curing agents. According to the method, a common automobile tyre can normally operate within a range from a low temperature of -40 DEG C to a high temperature of +120 DEG C and has bulletproof, leakproof and puncture-resistant safety property after the raw materials are treated by the steps of crushing, mixing, hot melting and spraying by adopting corresponding preparation equipment; or a temperature-resistant high-molecular elastic leakproof rubber product capable of enhancing the safety property of the automobile tyre can be obtained by carrying out a forming step after the hot melting step. The method disclosed by the invention has the advantages of few steps and easy operation without carrying out any damaging processing on the inner wall of the automobile tyre.

A lead frame is provided, including one or more power terminals and one or more control terminals, wherein at least one of the control terminals is externally terminated with a press-fit contact member, and wherein at least one of the control terminals and at least one power terminals are formed from different materials. With the disclosed lead frame of the invention, lower material cross sections in the power terminals will be provided because of the better electrical conductivity when using pure copper compared to alloys with higher mechanical strengths. Also specific/different plating could be added to the individual needs of the different pin types without using masks in the plating process.

The invention relates to the technical field of microorganism, in particular to a preparation technique of complex fungicide repairing amino acid fermenting wastewater. The preparation technique includes steps of 1) preparing a carrier; 2) preparing complex fungicide liquid; 3) preparing complex algae solution; 4) preparing complex fungicide. The preparation technique is simple, feasible, easy to master, and applicable to industrial popularization and use.

The invention relates to the field of degradable plastic products, and particularly discloses a stretch-proof and easily-degradable plastic bag and a preparation method thereof. The stretch-proof andeasily-degradable plastic bag is prepared from the following raw materials in parts by weight: polyvinyl alcohol, starch, a photodegradation agent, kraft paper powder and citrate. The preparation method comprises the steps: crushing the kraft paper to 60-80 mesh to obtain kraft paper powder; carrying out ball milling on polyvinyl alcohol, starch, the photodegradation agent, the kraft paper powderand citrate to obtain a standby material; feeding the standby material into a film blowing machine, and controlling the temperature of a charging basket of the film blowing machine to be 155-165 DEG C, the temperature of a die orifice to be 170-180 DEG C and the blow-up ratio to be 2-3 to obtain a plastic film; and slitting and sealing the plastic film to obtain the stretch-proof and easily-degradable plastic bag. The stretch-proof and easily-degradable plastic bag has the advantages of being stretch-proof and easy to degrade.

The invention discloses an antistatic polypropylene fiber and nylon composite superfine fiber and a production method thereof. The antistatic polypropylene fiber and nylon composite superfine fiber is composed of a superfine polypropylene fiber as a core wire and a modified nylon 6 fiber layer coating outside the core wire, and an antistatic nanopowder material is arranged in the externally coated modified nylon 6 fiber layer; and the modified nylon 6 is denatured nylon 6 obtained through adding a silica nanopowder material under the active catalysis of a cerium oxide nanopowder material. The result of experimental tests on the antistatic polypropylene fiber and nylon composite superfine fiber obtained through the production method shows that the surface resistivity of the antistatic polypropylene fiber and nylon composite superfine fiber is in a range of 10<7>-10<9>, and the provided denatured nylon 6 increases the tensile strength of nylon 6, so the stringiness of nylon 6 is good, thereby the coating wire drawing of nylon 6 and the superfine polypropylene fiber is realized, and textile fibers obtained through the coating wire drawing have the characteristic advantages of the polypropylene fiber, has the characteristic advantages of nylon and also has a good antistatic effect.

The invention discloses a preparation method for a degradable polysaccharide-base hemicellulose composite biomembrane, and belongs to the field of biodegradable materials. The method comprises the following steps: weighing k type carrageen and guar gum as raw materials according to a certain proportion, adding deionized water, sufficiently stirring the raw materials and the deionized water, adding hemicellulose according to a certain proportion, then adding glycerine to stir so as to prepare a uniform turbid liquid, degassing the uniform turbid liquid under a vacuum state, taking and putting an appropriate amount of degassed uniform turbid liquid into a polystyrene culture dish, and drying to obtain the degradable composite biomembrane. Compared with the prior art, a certain amount of the hemicellulose is added, so that the tensile strength and the transparency of the composite membrane can be improved, and the water vapor permeability of the membrane can be reduced.

The invention discloses a suspending swing arm assembly, and belongs to the technical field of auto spare parts. The suspending swing arm assembly comprises a ball pin, internal and external ball seats and a housing which are sequentially arranged in match from inside to outside; a dustproof cover is arranged between the external wall of the ball pin and the housing, and the external wall of the ball pin is extended out of the housing; the internal ball seat is made of resin; the ball pin, the external ball seat and the housing are all manufactured by forging aluminum-silicon-magnesium alloy; and concave grooves are formed in the internal wall of the internal ball seat. The suspending swing arm assembly has the advantages of capability of automatically compensating the abrasion loss, high strength of extension and capability of achieving self-lubricating effect; and with the adoption of the suspending swing arm assembly, relatively high safety and relatively high riding comfort can be kept when a vehicle runs in various road conditions.

The invention belongs to the field of metal materials, and particularly relates to a high-strength cylinder sleeve, a preparing method of the cylinder sleeve and an iron alloy. The iron alloy comprises following components including, by weight, 2.8% to 3.4% of C, 0% to 0.1% of S, 1.5% to 2.5% of Si, 0.1% to 0.4% of P, 0.5% to 0.8% o Mn, 0.1% to 0.4% of Cr, 0.2% to 0.5% of Mo, 0.2% to 0.5% of Cu and Ni and the balance Fe. Through optimized design of all element contents in the cylinder sleeve, the cylinder sleeve has the higher tensile strength and the lower hardness, and the requirement of a modern high-speed racing engine for the high tensile strength and the low hardness of the cylinder sleeve is met.

The invention provides fixed-size production equipment of a steel rope. The fixed-size production equipment comprises a plurality of wire drawing machines, wherein steel wires drawn by the wire drawing machines are fed into a twisting machine to be twisted; a strand twisted by the twisting machine is input into a crank closer to form the steel rope; the fixed-size production equipment is characterized in that: a first upper pinch roller and a first lower pinch roller are arranged above and below each steel wire respectively; a steel wire encoder is arranged on the first upper pinch roller or the first lower pinch roller; a second upper pinch roller and a second lower pinch roller are arranged above and below each strand respectively; a strand encoder is arranged on the second upper pinch roller and the second lower pinch roller; a third upper pinch roller and a third lower pinch roller are arranged above and below the steel rope respectively; a steel rope encoder is arranged on the third upper pinch roller or the third lower pinch roller; and the steel wire encoder, the strand encoder and the steel rope encoder are connected with a programmable logic controller (PLC). By using the fixed-size production equipment provided by the invention, the tensile strength of the steel rope is greatly improved, the efficiency is greatly improved and the working time is saved.

The invention discloses a PC/PMMA composite material and a preparation method thereof. In the PC/PMMA composite material, PP-g-St is used as a compatilizer for blending and extruding the PP-g-St, PCand PMMA to synthesize a PC/PMMA composite material. The composite material includes, in percentage by weight, 50%-90% of PC, 4%-20% of PMMA, 4%-30% of PP-g-St and 2% of an organic silicon light diffusion agent. The preparation method comprises the following steps: step 1, weighing materials in percentage by weight, and uniformly mixing to obtain a PC/PMMA mixed material; 2, feeding the mixed material into a double-screw extruder to be extruded and granulated, thereby producing the PC/PMMA composite material, wherein the double-screw extruder is divided into nine sections, and the temperaturesetting ranges of all the sections are as follows: in the first area, the temperature is 226-230 DEG C; in the second area, the temperature is 236-240 DEG C; in the third area, the temperature is 246-250 DEG C; in the fourth area, the temperature is 246-250 DEG C; in the fifth area, the temperature is 252-256 DEG C; in the sixth area, the temperature is 257-261 DEG C; in the seventh area, the temperature is 246-250 DEG C; in the eighth zone, the temperature is 226-230 DEG C; in the ninth area, the temperature is 176-180 DEG C. According to the method, the physical properties of the material can be enhanced, and the tensile strength, the surface hardness, the thermal deformation temperature and the glossiness of the material are effectively improved.

The invention discloses a production method of a DMC composite material, and belongs to the field of material preparation. The specific method comprises the following steps: 1) adding 60-100 parts by mass of unsaturated polyester fibers and 30-50 parts by mass of glass fibers in a mass ratio of 2: 1 at normal temperature, uniformly mixing the unsaturated polyester fibers and the glass fibers, and standing for later use; (2) adding and mixing a cross-linking agent and a thickening agent according to the ratio of 1: 1, and then putting the mixture into the mixture of the unsaturated polyester fibers and the glass fibers in the step (1); and (3) putting the filler into the mixture in the step (2), and uniformly stirring, and (4) selecting chopped twistless roving as a core material, and carrying out mold pressing on the mixture obtained in the step (3) to the surface of the core material by adopting a mold pressing process. According to the invention, the recycled twisted yarn is used as the filler, in addition, the chopped twistless roving is selected as the core material, and the glass fiber is compounded to form the material, so that the material has remarkable characteristics, the alkali resistance is qualitatively improved, and the tensile strength is higher.

The invention discloses a plant fiber recycled concrete block and a preparation method thereof. The block is made from water, cement, sand, coarse aggregate and plant fiber, wherein the coarse aggregate adopts the mixture of natural macadam and recycled macadam; the ratio of the recycled macadam to the coarse aggregate is 30 to 50 percent; the ratio of plant fiber to the concrete block is 1 to 2 percent. Compared with the existing recycled concrete block, the plant fiber recycled concrete block has the advantages that the plant fiber recycled concrete block not only utilizes construction waste as the coarse aggregate of concrete, and meanwhile is mixed with waste crops to combined with the coarse aggregate, although the compressive strength of the axis of the block is reduced to a certain extent as compared with the existing recycled concrete block without recycled aggregate mixed, the tensile strength of the concrete is improved due to the influence of the plant fiber, the strength meets the requirements, and the plant fiber recycled concrete block can be applied to load-bearing blocks.

The invention discloses a bionic flexible grabbing device integrating adhesion and claw mixing contact. When the bionic flexible grabbing device integrating adhesion and claw mixing contact faces a target, front end cavities are filled with air through a pneumatic driving device, front end adhesion parts bend towards the side where the target is located, adhesion materials arranged on lower wallsstably adhere to the target under a certain amount of pressure, the lower walls made of flexible materials are deformed under the pressure, and the adhesion materials make better contact with the target; rigid supports are inlaid in the lower walls, tail end grabbing cavities continue to be filled with air while the target is bonded, and claws of grabbing parts stretch out under the air pressure effect and can hook the target; and adhesion and claw hooking are combined so that the bionic flexible grabbing device integrating adhesion and claw mixing contact can better adapt to targets in various appearances. When the pneumatic driving device sucks air out of the tail end grabbing cavities, the claws retract into the cavities, and the target is loosened; and in addition, the pneumatic driving device sucks air out of the front end cavities, the front end adhesion parts bend towards the side away from the target, and the adhesion device is completely separated from the target through detachment claws of the adhesion materials.