80results about How to "Improves compression resistance" patented technology

A non-aqueous electrochemical cell is disclosed having a heat-resistant coating on at least one of a negative electrode, a positive electrode, and a separator, if provided. The heat-resistant coating may consume heat in the cell to stabilize the cell, act as an electrical insulator to prevent the cell from short circuiting, and increase the mechanical strength and compression resistance of the coated component. In certain embodiments, the heat-resistant coating serves as a solid state electrolyte to produce a solid state electrochemical cell.

A sport board for snow sledding or surf body boarding comprises a multi-layered laminated composite foam core coupled with stiffening elements for mechanical strengthening of the board. The composite foam core comprises laminates of polyolefin foam base and stiffening elements composed of substantially polymer foam and has substantial higher compressive strength and flexural strength than the foam base. A front section may be made of the same blank material as the low density polyolefin foam base and is bonded to the front end of the foam core complex to give a full frontal flexibility for a higher directional control by the rider and improved shock absorbing property. Upper and lower polyethylene foam sheets wrap the foam core complex subassembly and head section for sled integrity and graphic film finishes the sled top, the bottom is also finished with a polyethylene sheet for slickness.

The invention provides oxidation resistant dimethyl silicon oil based magnetic fluid and a preparation method thereof; the dimethyl silicon oil based magnetic fluid is prepared by nano-magnetic particles, a surface modifier and carrier fluid, and the carrier fluid is the dimethyl silicon oil. The preparation method of the dimethyl silicon oil based magnetic fluid comprises the following steps: preparing the nano-magnetic particles; treating the nano-magnetic particles in an activated way; preparing the nano-magnetic particles which are modified by the surface modifier; adding the modified nano-magnetic particles which are purified into methylene dichloride, dispersing and filtering the mixture to obtain the methylene dichloride based magnetic fluid; adding the magnetic fluid into the dimethyl silicon oil to be stirred and dispersed, heating the mixture and maintaining the temperature between 50 and 90 DEG C, separating and precipitating the mixture to obtain the dimethyl silicon oil based magnetic fluid. The dimethyl silicon oil based magnetic fluid in the invention has the advantages of high stability, low temperature resistance and high temperature resistance. The preparation method is simple, high in efficiency and low in requirement on equipments, thus being easy to be applied in various fields and having wide application prospect.

The invention relates to a true tri-axial hydraulic fracture test machine which comprises a confining pressure system, an injection system and a true tri-axial test stand, wherein the injection system comprises a fracturing solution container I, a fracturing solution container II and a piston container, and a stirring mechanism is mounted in the fracturing solution container II. A test method comprises the following steps: injecting clear water and an additive into the fracturing solution container II according to a certain proportion, and starting the stirring mechanism to stir; injecting a fracturing solution into a cavity body above a piston plate in the piston container by utilizing pressure; respectively applying confining pressures onto three axial directions of a downhole rock core simultaneously through three high-pressure advection pumps; draining into a cavity body under the piston plate in the piston container through a constant-pressure constant-speed plunger pump I and / or a constant-pressure constant-speed plunger pump II; injecting the fracturing solution into the rock core to start to fracture and taking out the downhole rock core after the end of fracturing to observe fracture expansion condition. The true tri-axial hydraulic fracture test machine provided by the invention has the benefits that the technical scheme is simple and easy to understand, the operation is convenient and fast, the unified control of the confining pressure system and the injection system can be realized, and the fracturing solution is convenient to replace.

The invention relates to an epoxy heavy-duty anticorrosive coating with integrated primer and finish layer, belonging to the technical field of heavy-duty anticorrosive coating. The coating is mainly characterized in that: according to the weight percentage, the coating comprises 25-35 percent of low molecular weight bisphenol A glycidyl ether epoxy resin Epon828 substrate, 10-20 percent of reactive toughening thinner 277, 12-35 percent of cardanol modified amine curing agent, 5-10 percent of high-titanium powder pigment, 30-40 percent of barium sulphate filling material and 0.7-2.4 percent of auxiliary agent. All key indexes of the coating greatly exceed that of the existing anticorrosive coating; the high-performance coating which can effectively carries out the long-acting protection under the severe corrosion environment has the protecting service life of more than 20 years, reduces the pollution, improves the environment, saves the resource, reduces the cost, and improves the economical benefits.

The invention discloses a run length coding-based two-dimensional code information hiding method. The method comprises the following steps of: simultaneously processing carrier information carrier andsecret information set; Before a two-dimensional code is generated, embedding secret information secret to be encrypted into carrier information card through an encryption algorithm, then generatingencrypted information into a two-dimensional code image QR, and genertaing a key Key; enabling The sender to send the two-dimensional code image QR to a receiver; And after receiving the QR of the two-dimensional code image, enabling the receiver to decrypt the QR through a decryption algorithm to obtain carrier information carrier and secret information set. And compressing the text information by adopting a run-length coding algorithm to obtain bits in which information can be embedded, thereby achieving the encryption purpose of the invention. The two-dimensional code information hiding method based on run-length coding has the advantages of being large in transmitted information amount, good in information concealment, high in robustness and compression resistance, high in safety and the like.

The invention relates to a true triaxial sand fracturing testing machine, which comprises a confining pressure system and an injecting system, wherein the injecting system comprises a first fracturing fluid container, a second fracturing fluid container and a piston container; two piston sheet baffle plates are arranged in the piston container. A true triaxial sand fracturing testing method comprises the following steps that stirring is performed in the second fracturing fluid container to form sand-carrying fracturing fluid; prepositive fracturing fluid is injected into the first fracturing fluid container; the prepositive fracturing fluid and the sand-carrying fracturing fluid are respectively injected into a middle cavity and an upper cavity of the piston container by pressure; through a first constant-pressure constant-speed plunger pump and / or a second constant-pressure constant-speed plunger pump, water is discharged into a lower cavity of the piston container; the prepositive fracturing fluid, the sand-carrying fracturing fluid and displacement fracturing fluid sequentially enter a downhole core for fracturing; after the fracturing is finished, the downhole core is taken out; the crack expanding condition is observed. The technical scheme is simple and is easy to understand; the operation is convenient and fast; the unified control on the confining pressure system and the injecting system can be realized; the fracturing fluid replacement is convenient.

The invention discloses a high-performance priming and finishing combined paint with corrosion inhibition, pollution prevention and heavy corrosion protection functions. The paint comprises two components: a component A includes a curing agent, an adhesion promoter, a wetting dispersant, silicon dioxide, hollow glass beads, talcum powder, nano micro powder, an anti-settling agent, a curing accelerator and an environment-friendly solvent; and a component B includes solvent-free liquid epoxy resin, modified elastic epoxy resin, silica sand, a wetting dispersant, superfine precipitated barium sulfate, titanium dioxide, aluminum triphosphate, barium metaborate, nano micro powder, an anti-settling agent, multi-functional auxiliaries, a corrosion inhibitor, an anti-fouling agent, high-strength hollow glass beads and an environment-friendly solvent. By aid of reasonable allocation of the component concentration, the paint has excellent adhesive force, durability, abrasion resistance and impact resistance, and excellent salt water resistance, oil resistance, alkali resistance and a certain degree of acid resistance; and the solid content is high, and the construction is convenient.

A resilient washer design having an annulus body and a concentric sleeve extending from the annulus with a plurality of ribs extending from the sleeve. The washer may have an opposing sleeve extending from the opposite side of the annulus with a second plurality of ribs in staggered location to the first set of ribs. This staggered position allows the annulus to flex between the ribs on opposing sides and resist compression of the washer when pressure is applied axially.

The invention discloses ice and snow resistant, and corrosion-proof coating which comprises the following materials by weight: 1.0 to 1.5 portion of silicone oil, 1.0 to 1.5 portion of organosilicon water repellent compound, 2.0 to 2.5 portion of calcium chloride, 0.8 to 1.2 portion of organosilicon defoamer, and1.0 to 1.5 portion of methylvinylsilicone rubber. The coating has the properties both as inorganic material and organic material, both can resist high and low temperature; insulate electric appliances; resist ozone, flame; is hydrophobic, corrosion-proof, weatherable, innoxious, tasteless, physiologically inert with small surface tension; and has low viscosity-temperature coefficient and can resist compression well. The coating can effectively prevent outdoor facilities, such as high voltage electric steel towers, communication equipment and so on, from being frozen. In addition, the coating further has radiation resistance.

The invention relates to a compression-resistant and wear-resistant lubricating agent comprising the following components in parts by weight: 90-95 parts of base oil, 2.0-2.5 parts of polymethacrylate, 3-3.5 parts of base zinc salt of dioctyl thiophosphate, 1.5-1.8 parts of trihydroxybenzoic acid, 1-1.5 parts of dialkenyl succinimide, 1.2-1.5 parts of phenylalanine, 0.8-1.2 parts of calcium sulfonate, 1.2-2 parts of graphite powder, 2.5-3.0 parts of modified molybdenum disulfide, 1.8-2.0 parts of naphthylphenyl phosphate and 1.2-1.5 parts of polyvinyl n-propyl ester. According to the technical scheme, all the components take a synergistic effect, so that the performance of the base oil is improved; and all the components can be uniformly dispersed, so that the lubricating property of the lubricating oil is good, and particularly the wear resistance and high-temperature resistance are remarkable.

The invention discloses heat-conducting silicone grease which is prepared from the following raw materials in parts by weight: 67 parts of methyl ethoxy silicone oil, 16 parts of fibrous carbon nano-tubes, 25 parts of aluminum oxide, 12 parts of scrap rubber nano-powder, 0.2 part of silane-based quaternary ammonium salt phase transfer catalysts, 3.5 parts of organic silicone oil, 8 parts of silane coupling agents and 0.8 part of antioxidants 1076. According to the heat-conducting silicone grease, the heat-conducting property of a product is enhanced by compounding the fibrous carbon nano-tubes, the aluminum oxide and the scrap rubber nano-powder as heat-conducting insulating fillers, the scrap rubber nano-powder can be used for enhancing the flowability of the product in a preparation process and filling a gap to obtain larger heat-transfer specific surface area, so that a final heat-conducting silicone grease product has the advantages of excellent heat conductivity, electrical insulation, weather resistance, hydrophobicity, physiological inertia and less surface tension, lower viscosity-temperature coefficient, higher compression resistance and no corrosion effect and can be used as a gas filling medium between an electronic element and a radiating fin.

The invention discloses anti-ultraviolet anti-discoloration ultra-clean hydraulic oil which is prepared from the following components in parts by weight: base oil, methyl silicone oil, benzotriazole, sodium tripolyphosphate, a demulsifying agent, nano silicon dioxide, a UV-531 ultraviolet light absorber, an antioxidant, an anti-wear agent, a dispersing agent, a viscosity modifier, a defoaming agent, a lubricating agent and a cosolvent. According to the anti-ultraviolet anti-discoloration ultra-clean hydraulic oil, the problems that hydraulic oil in the existing market cannot resist ultraviolet and discoloration and is high in turbidity are solved, the protection effect on equipment after the product is used is improved, the anti-ultraviolet and anti-discoloration capacity is improved, meanwhile, a lubricating medium is used for slowing down abrasion of the product, the hydraulic oil has the functions of cleaning, preventing pollution and the like, prevents sedimentation and agglomeration of particles, improves the use effect of a product, delays yellowing, blocks physical property loss, better meets the use requirements, helps to improve the working speed and can facilitate work of workers.

The invention discloses an anti-track uvioresistant ADSS optical cable jack material which comprises the following raw materials by weight part: 65-70 parts of high density polyethylene resins, 15-20 parts of ethylene acrylic copolymers, 9-10 parts of polyethylene grafting materials, 5-6 parts of polydimethylsiloxane, 15-20 parts of magnesium hydrate, 5.0-5.5 parts of carbon black master batches, 0.5-1.0 part of ultraviolet light absorber and 0.5-1.0 part of antioxidant. In a preparation process, the raw materials are put into a high-speed mixing machine and are uniformly mixed, and then are continuously extruded by a double-screw extruder for two times, and are cooled, cut into grains and dried, so that the jack material provided by the invention is acquired; the temperature of the double-screw extruder is at 160-230 DEG C. The anti-track uvioresistant ADSS optical cable jack material can serve as the jack material special for 220KV and above ADSS optical cable, can realize high-altitude suspending remote conveying, can resist corona and electric track, can resist ultraviolet irradiation, can bear the cold environment test under wind, rain, snow and frost environments and has excellent physical and mechanical properties.

The invention discloses a heat-conducting silicone grease composition which is prepared from methyl ethoxy silicone oil, hexagonal boron nitride, aluminum oxide, scrap rubber nano-powder, a silane-based quaternary ammonium salt phase transfer catalyst, organic silicone oil, a silane coupling agent, an organic siloxane surface modification agent, an antioxidant 168 and an antioxidant 1010. According to the heat-conducting silicone grease composition, a product is high in performance cost ratio by compounding the hexagonal boron nitride, the aluminum oxide and the scrap rubber nano-powder as heat-conducting insulating fillers; in addition, the scrap rubber nano-powder with a small particle diameter can be used for enhancing the flowability of the product in a preparation process and filling a gap to obtain larger heat-transfer specific surface area, so that a final heat-conducting silicone grease composition product has the advantages of excellent heat conductivity, electrical insulation, weather resistance, hydrophobicity, physiological inertia and less surface tension, lower viscosity-temperature coefficient, higher compression resistance and no corrosion effect, can be used for well filling the gap between an electronic element and a radiating fin and is a very good medium material of the electronic element.

The invention belongs to the field of composite molding processes and mainly provides a diversion method for a composite vacuum perfusion molding process. The diversion method comprises the steps of paving diversion mediums (5) on the upper surface of a dry fiber paving layer, wherein the intervals among the diversion mediums located on the upper surface of the dry fiber paving layer form a diversion medium partition area (8); overlapping a diversion bridge (9) between the adjacent diversion mediums (5) with the intervals, wherein the adjacent diversion mediums (5) with the intervals are communicated by the diversion bridge; and cooperating the diversion bridge (9) overlapped between the adjacent diversion mediums (5) with the intervals with the diversion medium partition area (8) formed by the intervals among the diversion mediums so as to control the dispersion speed of liquid resin on the upper layer of the paving layer and guarantee the permeation and dispersion speed of the liquid resin in a direction perpendicular to the paving layer which is the bottom layer, wherein the diversion bridge overlapped between the adjacent diversion mediums with the intervals is composed of the material which is same with the diversion mediums (5).

The invention discloses a satellite data transmission method based on image information hiding. According to the satellite data transmission method based on image information hiding, carrier images are classified according to the blocking characteristics of the carrier images, information to be transmitted is divided into groups of different lengths and is embedded into different types, and different types of image blocks are embedded with different capacities by adopting different sub-image partition methods, thereby realizing hidden transmission of high-capacity, anti-compression and high-restoration-quality. A satellite data transmission system based on image information hiding comprises a satellite information grouper, a carrier image classifier, a multi-information hider, a satellite data transmitter, a ground data receiver and a ground hidden information extractor. Hiding of information is realized through the multi-information hider, and the efficiency and security of satellite data transmission are increased and improved under the condition of not increasing the transmission rate.

The invention relates to a compression-resistant wear-resistant lubricant. The compression-resistant wear-resistant lubricant comprises, by weight, 90-95 parts of base oil, 2.0-2.5 parts of polymethacrylate, 3-3.5 parts of a base zinc salt of dioctyl thiophosphate, 1.5-1.8 parts of trihydroxybenzoic acid, 1-1.5 parts of dialkenyl succinimide, 1.2-1.5 parts of phenylalanine, 0.8-1.2 parts of calcium sulfonate, 1.2-2 parts of graphite powder, 2.5-3.0 parts of modified molybdenum disulfide, 1.8-2.0 parts of naphthylphenylphosphate and 1.2-1.5 parts of polyvinyl n-propyl ester. Through synergism of components, base oil performances are improved. All the components can be uniformly dispersed so that lubricating oil lubrication performances are good and wear resistance and high temperature resistance are outstanding.

The invention belongs to the technical field of digital watermarking, and discloses a histogram shifting-based robust reversible image watermarking method and an application. The method comprises thesteps of dividing an original image into blocks; dividing the divided blocks into four groups according to a characteristic that pixel values are close to 0 or 255, performing marking, and performingembedding; multiplying the blocks by a mask M and performing summary calculation to obtain alpha values; generating a histogram according to the alpha values obtained by all the blocks; and accordingto an alpha value range and embedded data, moving the pixel values. According to the method, all the shifted blocks in the histogram are subjected to data embedding, so that the purposes of better robustness, improved compression resistance and the like under the condition of encountering a non-malicious attack are achieved; under the condition of the same embedding capacity, different compressionquality factors are adopted, so that the bit error rate (BER) is lower; and the dislocation problem possibly caused by no embedding of watermark shifting blocks is avoided, so that larger embedding capacity is obtained in a histogram shifting process, and the BER of watermark extraction is lower.

The invention relates to a ball socket sleeve connected with an automotive suspension control arm and is characterized in that a hollow ball socket sleeve is pressed into a columnar casing embedded with a spherical support in a stamping manner, the oscillation angle of a casing pipe is determined by the opening of the columnar casing and the neck of the casing pipe, and the rotation angle of the casing pipe around the ordinate axis of the columnar casing is not restricted. The material of spherical support has the characteristics of high pressure resistance and low friction and provides relatively high radial stiffness and low torsional stiffness to the ball socket casing pipe, and the axial stamping interference magnitude of a ball socket and the columnar casing generates great axial stiffness. The ball socket sleeve is made of a low-friction and high-strength material through fine machining, and through locking, sealing, lubricating grease filling, the durability and conformity of production of ball socket sleeve products is superior to rubber sleeves in the prior art.

A sport board for snow sledding or surf body boarding comprises a multi-layered laminated composite foam core coupled with stiffening elements for mechanical strengthening of the board. The composite foam core comprises laminates of polyolefin foam base and stiffening elements composed of substantially polymer foam and has substantial higher compressive strength and flexural strength than the foam base. A front section may be made of the same blank material as the low density polyolefin foam base and is bonded to the front end of the foam core complex to give a full frontal flexibility for a higher directional control by the rider and improved shock absorbing property. Polyethylene foam sheets wrap the foam core complex subassembly and head section for sled integrity and graphic film finishes the sled top, the bottom is also finished with a polyethylene sheet for slickness.

The invention relates to a high temperature resistant low-deformation medical TPE (thermoplastic elastomer) injection molding rubber plug material and a preparation method thereof. The material mainly contains the following components in parts by weight: 20-150 parts of SEBS, 20-120 parts of at least one of SEPS and SEEPS, 20-200 parts of white oil, 20-160 parts of reinforced resin and 10-200 parts of filler. The material has the beneficial effects that the elasticity and strength of the new copolymer are greatly improved by blending SEBS, SEPS and SEEPS; the temperature and stress deformation resistance of the product system is improved by using the high molecular weight raw materials; the microscopic interlayer spacing of the product molecules is changed via the intercalation effect of montmorillonite, thus not only improving the original surface rigidity, creep resistance, acid-base resistance and dimensional stability of the filler system, but also improving the compatibility of the whole system and improving the high temperature resistance and low deformation performance of the product.

The invention belongs to the technical field of foaming materials for shoes, and discloses a high-wear-resistance EVA foaming material for shoes and a preparation method thereof. The foaming material is prepared from formula materials through mixing and foaming, and comprises, by weight, 40-60 parts of ethylene-vinyl acetate copolymer; 20-30 parts of polyolefin elastomer; 5-10 parts of maleic anhydride graft; 10-15 parts of a wear-resistant agent which is a composite solid material of polytetrafluoroethylene and butadiene styrene rubber; 0.2-1 part of stearic acid; 0.2-1 part of zinc stearate; 0.3-2 parts of zinc oxide; 2-5 parts of talcum powder; 0.3-1.5 parts of a bridging agent; and 1.5-5 parts of a foaming agent. The wear resistance, compressive deformation resistance, resilience and softness of the EVA foaming material are improved without affecting the non-slip performance of the foaming material, and the EVA foaming material has important practical significance for expanding ground-touching EVA foaming soles.

The invention discloses a direct connection type special-thread thermal-insulating oil pipe. The direct connection type special-thread thermal-insulating oil pipe is characterized in that the outer diameter of one end of an outer pipe (1) is upset and thickened, one end of the outer pipe (1) is sequentially provided with special fastening inner thread structures (5), the other end of the outer pipe (1) is provided with a special fastening outer thread structure (8), and the thermal-insulating oil pipes are directly connected to form a pipe column. By the arraignment, the direct connection type special-thread thermal-insulating oil pipe has the advantages that connection is performed by the threads at two ends of the outer pipe, the coupling connection of existing thermal-insulating oil pipes is avoided, structure simplification is achieved, and cost is reduced; wall thickness is increased, so that the tensile strength of the oil pipe is increased; sealing conical faces are disposed at the ends and tails of the threads, so that sealing performance is increased; by anti-torque shoulders, the compression resistance, the torque resistance and the thermal insulating effect of the oil pipe are increased greatly as compared with the prior art.

The invention relates to a special threaded buckle connector which comprises a female buckle and a male buckle with metal contact surfaces. The metal contact surfaces include thread partial contact and non-thread position contact. Thread partial contact includes the situations that the female buckle internal thread tooth top makes contact with the male buckle external thread tooth bottom and the bearing faces of internal and external thread teeth contact. Non-thread position contact includes the situations that sealed faces of internal and external threads contact, first conical surfaces of the internal and external threads contact, and step surfaces of the internal and external threads contact. After the threaded connector is tightened, the sealed faces of internal and external threads are in interference fit, and the sealing effect is achieved. According to the special threaded buckle connector, through an improved thread tooth structure and a certain distance existing between the positions of the sealed surfaces and the step surfaces, compared with the prior art, the special threaded buckle connector integrates the high properties of high connecting strength, high compression resistance, high torque resistance, high bending resistance, high temperature resistance and the like, on-site actual operation is facilitated, and the abnormal production time of companies of party A is reduced.

The invention discloses a cable sheath material added with coumarone-indene resin. The cable sheath material is prepared from the following raw materials in parts by weight: 35 to 55 parts of nitrilerubber, 15 to 25 parts of coumarone-indene resin, 20 to 30 parts of tetrafluoroethylene-perfluoroalkyl vinyl ether copolymers, 2 to 5 parts of a waste tire rubber powder, 1 to 3 parts of asphalt, 2 to5 parts of carbon black, 1 to 3 parts of chlorinated paraffin, 0.5 to 1.5 parts of dibasic lead phosphite, 0.5 to 1.5 parts of 2-hydroxy-4-methoxydiphenylketone, 3 to 5 parts of a plastic reinforcingagent, 1 to 3 parts of a ceramic micropowder, 0.5 to 1.5 parts of zinc oxide, 2 to 4 parts of a cross-linking agent and 1 to 2 parts of an assistant crosslinker. The invention also discloses a preparation method of the cable sheath material added with the coumarone-indene resin. The sheath material disclosed by the invention is subjected to secondary cross-linking complex processing and does notneed to be vulcanized; a production method is simple, and convenience in processing and use is realized; the sheath material has the advantages of excellent ageing resistance, long service life, goodelectrical insulation property, no moisture absorption, great insulation resistance as well as excellent corrosion resistance and environmental stress cracking resistance.

The invention belongs to the technical field of power and particularly relates to an improving process for the hydrophobicity of external insulation of power equipment. The improving process comprises the following steps: (1) roughening the surface of the power equipment; (2) preparing a viscous solution from 15-20 parts of fluoroethylenepropylene, 10-15 parts of vinyl-terminated silicon oil, 5-10 parts of dimethyl silicon oil, 5-10 parts of polyetheretherketone and 20-60 parts of a diluent, pouring a solution film with the thickness of 300-800mu m on the surface of the power equipment, and then, carrying out vacuum defoamation; (3) uniformly scattering 10-30 parts of hydrophobic nanopowder on the surface of the solution film in the step (2) by a sieve, keeping the scattering for 20-26h, and then, carrying out baking at 80-150 DEG C for 2-6h to form a film; and (4) removing residual powder on the surface of the film in the step (3) by flushing with clear water, and drying the film. The improving process disclosed by the invention is low in cost, safe and convenient to operate and high in adhesion strength of the film on the outer edge of the equipment and a substrate.

The invention discloses a vertical water stop structure for a water conservancy project and a construction method. The water stop structure comprises a red copper sheet, a channel steel groove and a fixing piece, wherein the red copper sheet is L-shaped, one end of the L shape is fixed in concrete, the other end of the L shape is inserted into the channel steel groove, and the channel steel grooveis in fastening connection with the fixing piece through a bolt; the channel steel groove is a splicing groove; the surface of the fixing piece is subjected to corrosion prevention treatment; corrosion prevention comprises the following steps that electrophoresis coating treatment is carried out on the surface of the fixing piece in advance or the surface of the fixing piece is wound with a viscoelastic body anti-corrosion material; the construction method of the vertical water stop structure for the water conservancy project comprises the following steps that S1, primary concrete is poured;S2, asphalt felt is laid; S3, the channel steel groove is formed; S4, asphalt is poured; and S5, secondary concrete is poured. According to the vertical water stop structure for the water conservancyproject, the splicing channel steel groove is formed, the internally-arranged fixing piece is arranged, and an corrosion prevention layer is arranged on the surface of the fixing piece, so that the fit of channel steel and the concrete is improved, the freezing strength is reduced, and the durability of the water stop structure and the concrete is improved.

The invention discloses a preparation method for an alternating multilayer microporous silicone rubber foam material. The preparation method comprises the following steps that (1), silicone rubber compound is prepared; (2) coextrusion is performed, and a silicone rubber composite material with an alternating multilayer structure is obtained; (3), a multi-layer silicone rubber sample to be foamed is prepared; (4), supercritical fluid foaming is performed, wherein the prepared multi-layer silicone rubber sample to be foamed is placed into an autoclave, heating and pressurizing are performed to the set conditions so as to convert gas into a supercritical state, quick decompressing is performed after swelling and saturation for a period of time, and the multi-layer silicone rubber foamed sample is obtained; and (5), vulcanization is performed. According to the preparation method, by utilizing the difference of reinforcing and nucleation efficiency of different fillers in a silicone rubbermatrix, the difference of cells in adjacent layers of the prepared alternating multilayer microporous silicone rubber foam material is obvious, so that the compression strength of the silicone rubberfoam material is greatly improved, and the compression resistance of the silicone rubber foam material is remarkably higher than that of the silicone rubber foam material with single distribution anddouble distribution of the cells.

The invention relates to a production formula for a spinning rubber roller with high oil resistance and compression resistance. The spinning rubber roller comprises a roller core and a rubber composite layer coated on the roller core; the roller core is made of an aluminum tube with inner diameter surface roughness Ra less than 0.09; the rubber composite layer comprises the following raw materialsin parts by weight: 60-80 parts of carboxy nitrile rubber, 20-40 parts of butyronitrile pre-crosslinked rubber, 5-20 parts of carboxyl-terminated liquid nitrile butadiene rubber, 1.5-4 parts of functional wear-resisting agent, 1.5-3 parts of accelerant, 3-8 parts of cross-linking active agent, 5 parts of titanium dioxide, 1.5 parts of stearic acid, 1-2 parts of anti-aging agent, 1-3 parts of antistatic agent, 6-20 parts of fortifier and 4-8 parts of colloidal sulfur. The invention is capable of improving the current situation that the present nitrile rubber formula is not oil-resisting and iseasy to concave and deform under the running conditions of spinning cellulosic fiber, siro spinning, large drafting and no spinning stroke.