154results about How to "Reduce toughness" patented technology

The invention relates to the field of matt films, in particular to a scratch-resistant BOPP (biaxially-oriented polypropylene) matt film and a preparation method thereof. The scratch-resistant BOPP matt film comprises an upper surface matt layer, a middle core layer and a lower surface layer which are sequentially arranged, the upper surface matting layer comprises a matting master batch; the matting master batch comprises 28 to 50 weight percent of co-polypropylene, 8 to 14 weight percent of ethylene-octylene block copolymer, 6 to 10 weight percent of micro-crosslinked polypropylene and 30 to 50 weight percent of high-density polyethylene; the ethylene-octylene segmented copolymer comprises a hard segment with low octylene content and high crystallinity, and an amorphous soft segment with high octylene content; the middle core layer comprises homo-polypropylene; the lower surface layer comprises a smooth surface layer or an extinction layer. By utilizing the synergistic effect of the ethylene-octylene block copolymer and the micro-crosslinked polypropylene, the compressive deformation performance, the impact strength, the tensile strength and the yield strength of the co-polypropylene are improved, the indentation of a film surface in a scraping pressure applying stage and the scratches and damages generated in a sliding stage are reduced, the scratch resistance of the upper surface matting layer is improved, and the matting effect is ensured.

The invention discloses benzoxazine modified epoxy resin as well as a preparation method and application thereof. The benzoxazine modified epoxy resin comprises the following components in parts by weight: 40-80 parts of benzoxazine resin, 20-60 parts of epoxy resin, 7-22 parts of a curing agent and 0-1 part of a toughening agent. The high-temperature type benzoxazine modified high-temperature type epoxy resin particularly comprises benzoxazine resin with ethynyl and / or allyl and bisphenol A type or bisphenol F type benzoxazine resin, and naphthalene type epoxy resin or bisphenol F type epoxy resin containing two or more epoxy functional groups. The high-temperature-resistant epoxy resin can be mixed for use, such as four-functionality bisphenol F epoxy resin, on the premise that the mechanical strength of the high-temperature-resistant epoxy resin is reserved, the high-temperature resistance of an epoxy resin curing system can be kept, and the dielectric constant is remarkably reduced. The curing agent further improves the mechanical properties. The preparation and curing method is simple and convenient, the raw materials are easy to obtain, and the cured material has excellent characteristics of high-temperature-resistant, high-toughness and low-dielectric materials.

The invention discloses a false eyelash supporting part, a false eyelash, a false eyelash processing method and a false eyelash using method. The false eyelash supporting part comprises an adhesion layer with a length. When being heated to be viscous, the eyelash adhesive tape is used for adhering eyelash wool in the length direction; after the normal temperature is recovered, eyelash wool can be attached to the eyelash mask so as to support the eyelash wool to keep a preset shape; the false eyelash includes: a false eyelash support; the eyelash wool is attached to the false eyelash supporting part; and the false eyelash supporting part is connected near the root part of the eyelash wool when being heated to be viscous. The false eyelash supporting part can be bonded with eyelash wool in a molten state, the step of glue injection is omitted, damage to the human body is small, and the process is simple.

The invention discloses a high-strength pipeline wide and thick steel plate based on strain design and a production method thereof. The steel plate comprises the following chemical components in percentage by weight: 0.030%-0.065% of C, 0.20%-0.45% of Si, 1.70%-1.85% of Mn, less than 0.030% of Nb, 0.060%-0.15% of V, 0.075%-0.170% of (Nb + V), 0.005%-0.025% of Ti, less than or equal to 2.0 of Ti / N, and Nilt. The steel comprises the following components in percentage by weight: 0.15% of Fe, less than 0.15% of Mo, 0.20%-0.50% of Cr, less than 0.15% of Cu, 0.40%-0.80% of (Ni + Mo + Cr + Cu), less than or equal to 0.025% of Zr, 0.005%-0.025% of Al, 0.005%-0.015% of N, 0.0015%-0.0040% of Ca, more than or equal to 1.6% of Ca / S, less than or equal to 0.010% of P, less than or equal to 0.002% of S, less than or equal to 0.00015% of H, less than or equal to 0.0018% of O and the balance of iron and inevitable impurities. The CEIIW of the high-strength pipeline wide and thick steel plate is controlled to be 0.42%-0.49%, the CEPcm of the high-strength pipeline wide and thick steel plate is controlled to be 0.17%-0.21%, the high-strength pipeline wide and thick steel plate with high strength, high toughness, strain resistance and good weldability is obtained through specific heating, rolling and cooling production processes, and the high-strength pipeline wide and thick steel plate has very wide application prospects.

The invention discloses a high PV value polytetrafluoroethylene integral sliding bearing and a preparation method thereof, and the high PV value polytetrafluoroethylene integral sliding bearing is prepared by using polytetrafluoroethylene and fusible polytetrafluoroethylene as polymer matrixes, using sizing modified polytetrafluoroethylene fiber as a main reinforcing component, combining with a lubricating filler, and carrying out low temperature mechanical blending, bidirectional pressing and sinter molding processes. According to the invention, the fusible polytetrafluoroethylene is introduced to modify polytetrafluoroethylene, and the creep resistance and wear resistance of the composite material are improved by constructing a polymer alloy; the polytetrafluoroethylene fiber sized and modified by the heat-conducting filler is used as a main reinforcing filler, so that the heat-conducting property and the bearing capacity of the composite material are improved, and the reduction of strength and toughness caused by introduction of a large amount of high-modulus inorganic filler is avoided. The composite bearing has the advantages of high bearing capacity, high heat conductivity, high strength, high flexibility and excellent friction and wear performance, particularly has a relatively high PV value, and can be applied to transmission parts of mechanical devices in many industries such as chemical engineering, automobiles, pharmacy, food and the like.

The invention relates to the technical field of epoxy resin, in particular to an epoxy resin composition for high-strength carbon fiber winding and a preparation method thereof.The preparation method of the epoxy resin composition comprises the steps that S1, modified epoxy resin, a compatilizer, a retarder, a defoaming agent and nano filler are added into a reaction kettle and mixed and stirred, and a mixture A is obtained; s2, a composite curing agent is added into the mixture A, stirring and mixing are conducted, and the epoxy resin composition is obtained and has the advantages of being appropriate in viscosity, good in heat resistance, excellent in impact resistance, large in bending strength, small in volume shrinkage rate in the curing process, moderate in gelation time and capable of being wound with carbon fibers conveniently to prepare the composite material.

The invention discloses a preparation method and application of a wear-resistant TPE material for a data cable, polyether polyol and isophorone diisocyanate are subjected to a reaction to form a polyurethane prepolymer, a reinforcing monomer and a modified filler are added, a chain extension reaction is performed, and finally ethylenediamine is added to prepare the wear-resistant TPE material. The addition of the modified filler increases the crosslinking points of the TPE material, so that the molecules of the TPE material form a stable grid shape, further the wear resistance of the TPE material is improved, a zinc organic framework is connected between the modified filler and the molecular chain of the polyurethane prepolymer, and the modified filler contains a six-membered ring structure, so that the TPE material can well adapt to surface contact when being worn, and the wear resistance of the TPE material is improved. And moreover, the modified filler and TPE material molecules are dynamically crosslinked, so that the toughness of the material is not greatly reduced due to the increase of crosslinking points, and the bending resistance effect of the TPE material is further improved.

The invention discloses a composite plate strip for a water cooling plate, which relates to the technical field of aluminum alloy and comprises the following components in parts by weight: 100-120 parts of aluminum, 5-8 parts of manganese, 2-3 parts of silicon, 8-12 parts of rhenium, 5-10 parts of niobium, 12-16 parts of chromium, 2-5 parts of lanthanum, 2.50-3.50 parts of copper, 0.50-1.50 parts of zinc, 0.60-1.50 parts of strontium and 1.20-1.50 parts of titanium. According to the composite plate strip for the water cooling plate, the components of the aluminum alloy are reasonably adjusted, niobium and aluminum are combined, the aluminum alloy has extremely high chemical stability, lanthanum and strontium are added, in the melting process, lanthanum and strontium are fully combined with the aluminum alloy, lanthanum and strontium are matched, and therefore the heat resistance of the aluminum alloy is improved. And a protective oxidation film is formed on the surface of the aluminum alloy, so that oxidation and corrosion of the aluminum alloy can be effectively prevented, and the corrosion resistance of the aluminum alloy is improved.

The invention discloses intelligent turnover equipment for alloy forgings after heat treatment, and relates to the technical field of alloy forging equipment, the intelligent turnover equipment comprises a driving base and further comprises driving wheels, a buffer mechanism, a balance assembly and a clamping mechanism, the driving wheels are arranged on the two sides of the driving base and used for driving the driving base to move, and the buffer mechanism is arranged on the driving wheels; a buffering mechanism is arranged at the bottom of the driving base, the top of the driving base is connected with the supporting base in a matched mode through bolts, and high-pressure steam can enter the first clamping block and the second clamping block. The rotating mechanical arm drives the alloy forge piece to rotate and turn over, in the process, high-pressure steam in the clamping block is sprayed out through holes in the surface of the air groove, and oxide skin and impurities on the surface of the alloy forge piece are removed; meanwhile, due to the high-temperature characteristic of the high-pressure steam, the heat loss of the alloy forge piece is reduced, and the situation that the internal stress of the material is increased and the toughness and strength of the material are reduced due to too fast temperature reduction is avoided.

The invention discloses high-toughness low-yellowness polyethersulfone as well as a preparation method and application thereof. The impact strength of the polyethersulfone is greater than 90J / m, and the yellowness index is less than 25. The polyether sulfone provided by the invention is especially suitable for application in some high-end fields, such as the fields of water treatment membranes, hemodialysis membranes and the like.

The invention discloses a manufacturing method of thin-gauge low-yield-ratio Q500qE bridge steel, and belongs to the field of steel manufacturing. The method comprises the steps of component design, casting, heating, rolling, cooling and the like, and finally the required finished steel plate is obtained. The low-temperature impact resistance of the steel plate can be ensured while high strength and low yield ratio of the steel plate are effectively ensured under the condition of low alloy addition. Besides, controlled rolling, cooling and heat treatment processes are combined, the steel plate in the TMCP + T state is obtained, a microstructure with refined ferrite and bainite as main components is obtained in the whole plate thickness, the steel plate has the mechanical property characteristics of high strength, low yield ratio and high toughness, and the low-temperature impact toughness is that the fracture fiber section rate can reach 85% or above at the temperature of-40 DEG C. According to the steel plate, the target performance requirement can be met, the plate shape of the steel plate can be guaranteed, the steel plate has good comprehensive mechanical performance, in addition, the manufacturing cost is low, the carbon content is low, the weldability is greatly improved, and the steel plate has high manufacturability.

The invention provides a method for displaying and evaluating phosphorus segregation of a high-carbon steel wire rod, which comprises the detailed steps of preparing a sample, preparing a phosphorus segregation etching solution, displaying and evaluating the phosphorus segregation of the high-carbon steel wire rod, detecting a standard map and the like. Distilled water and ethyl alcohol are sequentially added, finally FeCl3 and CuCl2 are added, and the mixture needs to be heated to 400 DEG C on a heating plate; in the detection process, the prepared etchant is used for etching a detection sample by adopting a wiping method, an optical microscope is used for observation, the position, with the most serious white band shape, of the longitudinal section of the sample serves as a measurement position, and the grade is evaluated according to the comparison between the percentage of the white linear part and the manufactured standard map. The phosphorus segregation condition of the high-carbon steel wire rod can be clearly displayed, so that the phosphorus segregation detection process of the high-carbon steel wire rod is standardized and normalized, and the method can be widely applied to phosphorus segregation detection of various high-carbon steel wire rods.

The invention discloses a low-temperature cured bi-component epoxy resin conductive adhesive. A component A and a component B are mixed according to a ratio of 1: 1 and then cured at room temperature; the component A at least comprises the following components: novolac epoxy resin, epoxy resin, core-shell toughened epoxy resin, a diluent, a coupling agent, a thixotropic agent and a conductive filler; the component B at least comprises the following components in parts by mass: a curing agent and an accelerant; wherein the core-shell toughened epoxy resin is bisphenol A epoxy resin with uniform nanoscale core-shell particle dispersity; the invention also discloses a preparation method of the low-temperature cured bi-component epoxy resin conductive adhesive. The curing of the conductive adhesive at low temperature or room temperature is realized, the internal reaction degree of the matrix is high, the mechanical strength and conductivity of the conductive adhesive are met at the same time, and effective bonding is realized and relatively good performance is kept after electronic components are cured in application scenes with use temperature requirements.

The invention provides a multifunctional double-end cotton swab. The multifunctional double-end cotton swab comprises a first cotton swab head and a second cotton swab head, the first cotton swab head is in a pointed-end shape, the second cotton swab head is in a round-end shape, a second hooking fiber strip is fixedly connected into the first cotton swab head, one end of the second hooking fiber strip is fixedly connected with a second arc-shaped fiber strip, and the other end of the second hooking fiber strip is fixedly connected with a third arc-shaped fiber strip. An opening is formed in one side of the second cotton swab head, and a first hooking fiber strip is fixedly connected to the interior of the second cotton swab head. According to the multifunctional double-end cotton swab, the pointed-end-shaped cotton swab head and the round-end-shaped cotton swab head are combined, the requirements of a user in different use scenes can be met, the pointed-end-shaped cotton swab head is suitable for fine cleaning, the round-end-shaped cotton swab head is suitable for large-area cleaning tasks, and the multifunctional double-end cotton swab is convenient to use through the direct-connection type connecting rod and the rotary type connecting rod. Different kinds of cotton swabs are used in a targeted mode, the cotton swabs are more flexible in use, a user adjusts the angle according to needs, and therefore the common problem of inconvenience in use of traditional cotton swabs is solved.

The invention discloses a steel plate for EH550 ocean engineering and a manufacturing method thereof. The steel comprises the following chemical components in percentage by mass: 0.06%-0.12% of C, 0.10%-0.50% of Si, 1.20%-1.80% of Mn, 0.20%-0.50% of Cr or 0.20%-0.50% of Mo, less than or equal to 0.03% of Nb, 0.02%-0.04% of V, 0.01%-0.03% of Ti, 0.015%-0.045% of Al, less than or equal to 0.015% of P, less than or equal to 0.006% of S and the balance of Fe and inevitable impurities. The thickness of the steel plate is 6-50 mm, the yield strength is not lower than 550 MPa, the uniform elongation is not lower than 10%, the yield ratio is not higher than 0.80, and the impact energy at the temperature of-40 DEG C is not lower than 200 J. And through high-temperature controlled rolling and controlled cooling, a bainite structure with the dislocation density evenly distributed is obtained, and the problems that the steel plate for ocean engineering produced through a traditional quenching and tempering technology is insufficient in even elongation and too high in yield ratio are solved.

This invention relates to the field of polymer material synthesis technology, specifically to a modified PVB resin and its preparation method. The invention introduces a fluorinated acetal monoaldehyde derivative containing fluorine into the PVB resin. This derivative is mixed with n-butyraldehyde and glyoxal, thereby undergoing an acetalization reaction with the 1,3-o-diol structure of the PVB molecular chain, incorporating the fluorinated side link into the PVB molecular chain. Utilizing the high electronegativity and high C-F bond energy of fluorine atoms, it shields against the intrusion of external corrosive media, inhibits oxidative yellowing, and improves weather resistance. Furthermore, the invention introduces glyoxal as a crosslinking agent, containing dialdehyde groups, which can react between adjacent polyvinyl alcohol segments, causing slight crosslinking between the originally linear PVB resin segments, improving the resin's shielding performance, further reducing the intrusion of external corrosive media, and enhancing the stability of the PVB resin.

The utility model discloses a distance adjusting device for ceramic roller spraying. The distance adjusting device comprises a spraying distance adjusting mechanism, a temperature measuring sensor and a master control module, the spraying distance adjusting mechanism is connected with a spraying gun and can adjust the distance between the spraying gun and a workpiece to be coated, and the temperature measuring sensor can measure the temperature of the surface of the workpiece to be coated. The temperature measuring sensor and the spraying distance adjusting mechanism are in signal connection with the master control module. The temperature measuring sensor is provided with a temperature sensor and used for measuring the surface temperature of a coated workpiece, and the master control module can find the situation that the surface temperature of the ceramic roller is too high through the temperature measuring sensor and control the spraying distance adjusting mechanism to adjust the distance between the spraying gun and the coated workpiece. And the surface temperature of the ceramic roller is reduced to a range in which deformation of the ceramic roller and reduction of the toughness of the net wall are not caused.

The invention relates to the technical field of degumming agents, in particular to a water-based neutral degumming agent and a preparation method thereof.The water-based neutral degumming agent is prepared from, by weight, 13%-17% of methyl salicylate, 27%-33% of glycol ether, 3%-7% of polyvinylpyrrolidone, 3%-5% of a softening agent, 1.1%-1.4% of a pH regulator, 1%-5% of liquid paraffin and the balance water; the device has the advantages that the OCA optical cement can be effectively removed, and the black oil is not damaged.

The invention relates to the technical field of brake disc materials, and discloses a brake disc material prepared from a carbon-ceramic composite material and a processing technology thereof.The processing technology comprises the following steps that phenolic resin, carbon powder, metal oxide, composite carbon fibers and a pore forming agent are evenly mixed and then placed in a mold, and a composite material prefabricated body is obtained through compression molding and cold water demolding; processing the composite material preform to form a carbon-ceramic brake disc rough blank, and then performing carbonization treatment to obtain a carbonized composite material; and mixing the carbonized composite material with silicon powder, carrying out siliconizing treatment, soaking in a protective solution, sintering, taking out, polishing and perforating to obtain the brake disc material prepared from the carbon-ceramic composite material. The composite carbon fiber contains a large number of silicon hydroxyl groups and can be tightly combined with phenolic resin, carbon powder, metal oxide and a pore-forming agent, and the polycarbosilane layer generates a nanoscale silicon carbide phase, so that the mechanical property and wear resistance of the brake disc material prepared from the carbon-ceramic composite material can be improved.

It is an object to provide a resistance spot welded joint and a resistance spot welding method therefor. The present invention is a resistance spot welded joint having a resistance spot weld formed by resistance-spot-welding two or more steel sheets including at least one high strength steel sheet. The high strength steel sheet has a specific chemical composition. The hardness Hv1 of a first region of a heat-affected zone and the hardness Hmv of martensite in a nugget as a whole satisfy the relation Hv1 ≤ 0.78 × Hmw, and the hardness Hv2 of a second region of the heat-affected zone and the hardness Hv1 of the first region satisfy the relation Hv2 ≥ 1.10 × Hv1. The hardness Hv3 of a third region of the heat-affected zone and the hardness Hv2 of the second region satisfy the relation Hv3 ≤ 0.90 × Hv2.

The invention belongs to the technical field of metallurgy, and particularly relates to 590MPa-grade hot galvanizing dual-phase steel and a production method thereof, and the steel comprises the following chemical components in percentage by mass: 0.02%-0.06% of C, 0.01%-0.03% of Si, 0.90%-1.8% of Mn, less than or equal to 0.025% of P, less than or equal to 0.010% of S, 0.005%-0.010% of Al, 0.05%-0.30% of Cr, 0.05%-0.30% of Mo, less than or equal to 0.0060% of O, 0.010%-0.020% of N, and the balance of Fe and inevitable impurities. The method has the advantages that low carbon-silicon-aluminum and high nitrogen are cooperatively regulated and controlled in component design, and in the hot rolling process, premature precipitation of AlN particles in the hot rolling process is effectively inhibited by controlling the low coiling temperature, so that a large amount of nitrogen is reserved in a hot rolled plate in a solid solution state.

The invention discloses high-strength hot rolled steel and a preparation method thereof, and the high-strength hot rolled steel comprises the following components in percentage by mass: 0.06%-0.09% of C, 0.05%-0.15% of Si, 1.8%-2.0% of Mn, less than or equal to 0.015% of P, less than or equal to 0.002% of S, 0.11%-0.145% of Ti, 0.1%-0.2% of Cr, 0.04%-0.05% of Nb, 0.01%-0.02% of V and less than or equal to 0.005% of N. The preparation method comprises the following steps: smelting and casting raw materials to obtain a plate blank; and the plate blank is heated, rolled, cooled, coiled and subjected to slow cooling treatment. Under the condition that molybdenum is completely not contained, the high-toughness hot-rolled steel plate with the thickness being 9-14 mm, the yield strength being larger than or equal to 700 MPa, the tensile strength being larger than or equal to 770 MPa, the percentage elongation after fracture being larger than or equal to 16% and the transverse impact energy being larger than or equal to 70 J at the temperature of-20 DEG C is successfully produced.

The invention relates to a preparation method of a high-strength and high-toughness coating rod type insulator for a high-speed rail contact net, and relates to the field of electrified traffic of high-speed railways. The high-strength and high-toughness coating rod type insulator comprises a porcelain insulator main body and an integrated metal flange body formed by an ETV coating and the porcelain insulator main body, the porcelain insulator main body is prepared by mixing calcined high bauxite, feldspar, kaolin, zirconite, quartz, cordierite, ceramic short fibers, clay and the like, adding the mixture into a ball mill, uniformly mixing to form slurry, sieving to remove iron, squeezing the slurry, pugging the slurry, performing high-pressure vacuum treatment, mechanically pressing to form a blank, cutting, drying, glazing, and firing at a high temperature of 1250 DEG C. The porcelain insulator main body is prepared by the steps of appearance detection, good quality detection and the like. By adopting a zirconium-aluminum composite ceramic matrix preparation technology, the composite material has the characteristics of high density, high strength, good toughness and small dispersity, the bending load tolerance strength is greater than or equal to 25KN / cm < 2 >, the torque load is greater than or equal to 15KN. M, and the composite material can completely meet the technical requirements of use of porcelain insulators in high-voltage power transmission grids of high-speed railways.

The invention relates to the technical field of high polymer materials, in particular to unshielded spraying finish paint for railway vehicles and a preparation process of the unshielded spraying finish paint. The invention relates to a shielding-free spraying finish paint for a railway vehicle. The shielding-free spraying finish paint is prepared from 35 to 50 parts of silicon modified waterborne polyurethane resin, 12 to 18 parts of modified polyether resin, 7 to 11 parts of anticorrosive filler, 0.8 to 1.3 parts of accelerant, 0.2 to 0.7 part of defoaming agent, 1.2 to 1.5 parts of solvent and 0.1 to 0.3 part of flatting agent. According to the non-shielding spraying finish paint for the railway vehicle, the defects that the adhesive force between coatings is poor, the corrosion resistance is poor, the adhesion time is short, and sagging is likely to happen are overcome, and the spraying finish paint has the good corrosion resistance and cohesiveness.

The invention relates to a composite solder and a preparation method and application thereof. First, Sn1.0Ag0.5Cu powder is used as a solder matrix powder, and the powder is divided into 5 parts, each of which is recorded as powder A. Ni / Al2O3 powder is premixed with one part of the powder A, and the premixed powder is divided into 4 parts, each of which is recorded as powder B. Another part of the powder A is taken, and it is melted in a crucible, and then another part of the powder B is added, and ultrasonic treatment is performed. After the ultrasonic treatment is completed, another part of the powder A is added and ultrasonic treatment is performed again. According to the above method, powder A and powder B are added alternately in sequence, and ultrasonic treatment is performed after each addition of powder A or powder B. Finally, powder B and powder A are completely added into the crucible to obtain a molten liquid C, and the molten liquid C is quickly cast into a stainless steel mold, cooled and demolded, and a Ni / Al2O3-reinforced Sn1.0Ag0.5Cu composite solder is obtained. The present invention can increase the toughness of the composite solder by premixing, adding Ni / Al2O3 in steps, and then ultrasonically melting and casting.

The invention relates to the technical field of double-chuck clamping devices, and discloses a double-chuck clamping device for valve element and valve seat welding, which comprises a workbench, a fixing device arranged at the top of the workbench, a cleaning device arranged at the top of the workbench, and a lubricating device arranged at the top of the workbench; the fixing device comprises a motor, a first supporting plate, a first reciprocating lead screw, a moving plate, a first fixing plate, a semicircular clamp, a first moving rod, a sleeve barrel, a triangular chuck and a clamping block, the first supporting plate is fixedly connected to the right side of the workbench, and the motor is fixedly connected to the left side of the first supporting plate; the semicircular clamp moves to clamp and fix the circumferential surface of the valve seat, so that the valve element and the valve seat can be accurately fixed at the position meeting the design requirement, and the relative position between the valve element and the valve seat is ensured to be accurate, so that the valve can be normally opened and closed after being machined and in use, and the flow and pressure of fluid are effectively controlled.

The invention discloses a biphenyl type polythiol compound and a preparation method and application thereof, the biphenyl type polythiol compound has a structural general formula as follows: # imgabs0 #, R1 and R2 are adjacent substituent groups on a benzene ring, R1 is mercaptopropyl, R2 is mercaptoalkoxy of C2-C18, f1m and f2n are other substituent groups on the benzene ring, and f1m and f2n are different substituent groups on the benzene ring. F1 and f2 are respectively and independently selected from any group except an organic metal group and a nucleophilic group, and m and n are respectively selected from any integer of 0-3. The sulfydryl alkyl and sulfydryl alkoxy ortho-substituted biphenyl type polythiol compound is prepared from the low-cost raw material biphenol, and the preparation method is simple, efficient, high in controllability, low in cost and suitable for batch preparation. When the ortho-substituted biphenyl polythiol compound is used as a curing agent, not only can low-temperature curing of a resin composition be realized, but also the bonding strength, heat and humidity resistance, mechanical property and waterproof property of cured resin can be remarkably improved.

The present invention discloses a method for forming a fin rudder of an underwater vehicle based on a carbon fiber composite material. The method uses a laminated carbon fiber material and a method of winding multiple layers of carbon fiber material in the warp and weft directions to form a fin rudder, making full use of the high strength of the fiber material in the warp direction, so that it has a low density and high strength, high stiffness and high toughness on the outside, avoiding the laminated structure of the fiber material from being easily peeled off under high torque, or causing large vibration and deformation under the action of hydrodynamic force due to low stiffness; at the same time, the manufactured fin rudder can have a lighter mass, reduce the overall weight of the vehicle, increase the battery capacity, and increase the total amount of energy that can be carried. In addition, the method uses a method of CNC machining and assembly followed by secondary compression molding, so that the fin rudder is not easily deformed, and the central axis of the rudder plate overlaps with the symmetry line, which can meet the zero lift position requirements and fin rudder line accuracy requirements after the fin rudder is assembled.

The invention relates to the technical field of cooling equipment, and discloses part cooling equipment for forklift part machining and welding. The placing groove is formed in the top of the workbench; the forklift fork head is placed in the placing groove; and the cooling assembly comprises a U-shaped plate, a motor, an output box and a rotating shaft. According to the welding device, a water pump is started to discharge water through a U-shaped pipe, so that deformation of a welding part caused by high temperature during welding is avoided, water spots are blocked through a baffle while water spraying is conducted, the situation that the welding effect is affected by the water spots is avoided, and after welding of one face is completed, a motor is started to enable a chain wheel to rotate to drive a chain to rotate, and the chain moves to drive a connecting block to move; in the moving process, the whole welding part of the fork head of the forklift can be welded, meanwhile, the whole welding part can be cooled, and in the cooling and water spraying process, the situation that hydrogen generated by water is adsorbed to the surface of welding metal, and the welding toughness and corrosion resistance are reduced can be avoided.

The invention provides a composite large-disc-diameter outer umbrella-shaped glass insulator, and relates to the technical field of insulators, the composite large-disc-diameter outer umbrella-shaped glass insulator comprises an insulator main body, the composite large-disc-diameter outer umbrella-shaped glass insulator is also provided with a rapid connection structure, and the rapid connection structure comprises a connection rod, a ball head, a cap nest, two connection frames and two connection rings, the upper surface of the insulator main body is fixedly connected with the lower surface of the connecting rod, the upper surface of the connecting rod is fixedly connected with the lower surface of the ball head, the upper surface of the insulator main body is fixedly connected with the upper surface of the cap nest, and the ball head on the insulator main body is aligned to the cap nest at the lower end of the other insulator main body and extrudes the two connecting rings at the moment; as the ball head is the flat-top cone, a worker only needs to press two insulators to achieve the purpose of connecting the insulators, the purpose of directly detaching the insulator string is achieved, the situation that the worker needs to use other tools for installation, consequently, the time cost of installation is increased is avoided, and the steps of installation and detachment are simplified.