110 results about "Tear resistance" patented technology

This invention discloses a method for preparing a three-dimensional integrated lumbar support cushion. The raw materials of the lumbar support cushion include: ethylene-vinyl acetate copolymer, polyether-type thermoplastic polyurethane elastomer, physically foamed microspheres, azodicarbonamide, caprolactam-blocked 4,4'-diphenylmethane diisocyanate, surface-modified copper nanowires, and silver-loaded silicone composite components. The preparation process is as follows: the matrix resin and modified copper nanowires are melt-blended at high temperature, and then mixed with the foaming system, crosslinking agent, and composite components at low temperature to obtain a blended base material; the blended base material is injection molded, followed by static differential temperature field for pressure holding and curing, and finally cooled and demolded. This invention utilizes copper nanowires to construct a thermally conductive network, which, combined with the external temperature difference, forms a continuous foaming ratio and crosslinking density gradient inside, eliminating the physical phase interface of traditional multi-material splicing, significantly improving the tear resistance and fatigue life of the transition zone; and utilizes cooling phase separation to form an anti-slip and antibacterial skin layer.

This invention relates to the field of insulation materials technology, specifically to a high-strength, tear-resistant, halogen-free, flame-retardant insulating material and its preparation method. The high-strength, tear-resistant, halogen-free, flame-retardant insulating material comprises the following components by weight: 70-90 parts EPDM rubber, 5-15 parts thermoplastic elastomer, 15-25 parts medium-density polyethylene, 10-20 parts ethylene-vinyl acetate copolymer, 3-5 parts triallyl isocyanate, 2-4 parts sulfur, 1-3 parts polyethylene wax, 3-5 parts zinc oxide, 1-3 parts antioxidant, 30-50 parts aluminum hydroxide, 20-40 parts modified silica, 0.2-0.5 parts ultraviolet absorber, 1-3 parts accelerator, and 2-4 parts silicone masterbatch. The high-strength, tear-resistant, halogen-free, flame-retardant insulating material prepared by this invention exhibits excellent tensile and tear resistance and flame-retardant properties, thereby extending its service life.

This application provides a flame-retardant silicone and its preparation method. In this flame-retardant silicone, through the synergistic effect of boron-containing polysiloxane prepolymer and functionalized boron nitride, the flame-retardant silicone has an afterflame time of ≤5s at 800℃, an oxygen index of ≥36%, and has passed UL94V-0 certification. It can quickly form a ceramic barrier layer at high temperatures, effectively preventing flame propagation. The helical structure of the siloxane main chain, combined with the reinforcing effect of functional fillers such as nano-fumed silica, low-melting-point glass powder, and activated inorganic smoke suppressant and flame retardant, makes the tensile strength of the flame-retardant silicone ≥45N, and the permanent tensile modulus retention rate ≥85% under 125% radial shrinkage, exhibiting excellent tear resistance. This flame-retardant silicone is suitable for applications requiring high flame-retardant performance, such as new energy cables and electronic device protection.

The application discloses a self-repairing flexible bionic composite material with high tear resistance and a preparation method thereof. The method is characterized in that a room-temperature self-repairing flexible polyurea elastomer SSPU is prepared by reacting THI, DBI and PDMS. The self-repairing flexible bionic composite material with high tear resistance is prepared by physically mixing the room-temperature self-repairing flexible polyurea elastomer SSPU and a gallium-indium-tin liquid alloy. The self-repairing flexible bionic composite material has the advantages of not affecting the flexibility of the material, greatly improving the tear resistance of the material, and having excellent photo-thermal response characteristics and fast photo-thermal repair capacity, and is suitable for preparing various stretchable and functional devices.

This invention discloses a low rolling resistance, high wear resistance, tear resistance, and energy-saving conveyor belt cover rubber and its preparation method, belonging to the technical field of conveyor belt cover rubber. The cover rubber is a vulcanized rubber composite with a self-layering structure, comprising, sequentially from the working surface of the cover rubber to the bonding surface with the belt core. This invention utilizes a vulcanized rubber composite with a self-layering structure to form a wear-resistant surface layer, a tear-resistant intermediate layer, and an adhesive bottom layer sequentially from the working surface to the bonding surface with the belt core. By utilizing the selective distribution of oxidized carbon nanospheres, modified basalt short fibers, and modified layered silicates during the latex co-precipitation process, the concentration of oxidized carbon nanospheres in the wear-resistant surface layer is not less than 85% of the total, the concentration of modified basalt short fibers in the tear-resistant intermediate layer is not less than 80% of the total, and the adhesive bottom layer is a pure rubber layer. This achieves a synergistic improvement in low rolling resistance, high wear resistance, and high tear resistance in a single cover rubber, resolving the contradiction that traditional cover rubbers struggle to achieve these properties simultaneously.

This utility model discloses a wear-resistant car floor mat, specifically relating to the field of car floor mat technology, comprising: a floor mat body; the floor mat body includes a base layer, with reinforcing layers symmetrically arranged on both sides of the base layer, a composite layer arranged on the top side of the upper reinforcing layer, and a waterproof layer arranged on the bottom side of the lower reinforcing layer; and a wear-resistant layer arranged on the top side of the composite layer. This utility model, by setting the wear-resistant layer, can greatly enhance the wear-resistant protective performance of the floor mat body, and the breathable layer arranged on the bottom side of the wear-resistant layer can give the floor mat body good breathability. Combined with the antibacterial layer and the absorbent layer, it can effectively absorb and purify viruses and bacteria, thereby greatly improving the antibacterial protective performance of the floor mat body; by setting the reinforcing layer, which consists of an elastic layer and a toughening layer, the elastic layer can greatly enhance the compressive strength of the floor mat body, and the toughening layers on both sides can give the floor mat body strong tensile and tear resistance.

This invention relates to a biodegradable barrier antibacterial moisture-absorbing film, which consists of two layers: a quaternary ammonium salt chitosan / hydroxyethyl cellulose composite layer and a methacrylated gelatin / methacrylated carboxymethyl chitosan composite layer. The two layers are bonded together by casting, biaxial stretching, and hot pressing, and a reaction is achieved between them to achieve a tight bond. The composite film has good tensile strength, ductility, and tear resistance. Under dry conditions, the film has good oxygen and carbon dioxide barrier properties, and also has good moisture absorption. This film can be used in packaging applications requiring barrier, moisture absorption, and antibacterial properties.

This invention relates to the field of new tire materials technology, and more particularly to a high-wear-resistant and tear-resistant passenger car tire tread rubber composition, its preparation method, and the tire thereof. The composition, based on 100 parts by weight of the rubber phase, comprises a blend of low molecular weight end-functionalized solution-polymerized styrene-butadiene rubber and high cis-high molecular weight polybutadiene, supplemented with silica, silane coupling agent, tackifying resin, and a small amount of carbon black for reinforcement. Through a mixing process of "high-temperature silanization masterbatch—low-temperature addition of high molecular weight rubber—low-shear peak retention," the rubber phase forms and maintains a distinct bimodal molecular weight distribution, thereby significantly improving crack propagation resistance and anti-sharding durability while maintaining wear resistance and low heat generation. Examples show that the obtained vulcanizate exhibits a tear resistance index meeting a predetermined threshold, with stable improvement in abrasion performance, making it suitable for high-load and complex road conditions, such as in electric vehicles.

The application relates to the field of polyurethane foaming materials, and particularly discloses a high-performance polyurethane elastomer for a high-rebound motor vehicle seat and a preparation method thereof, and the high-performance polyurethane elastomer for the high-rebound motor vehicle seat comprises the following components in parts by weight: polyether polyol 60-80 parts, a curing agent 40-60 parts, a foaming agent 1-2 parts, a catalyst 0.5-1 part, a chain extender 3-6 parts, a plasticizer 1-2 parts, a stabilizer 0.5-1 part, nano filler 2-6 parts, nano connecting material 1-4 parts and a flame retardant 1-2 parts; the preparation method comprises the following steps: uniformly mixing the polyether polyol, the nano connecting material, the nano filler and the flame retardant, then uniformly mixing and stirring the plasticizer, the chain extender and the stabilizer, finally uniformly mixing the foaming agent and the catalyst, defoaming, and obtaining a mixture; uniformly mixing the mixture and the curing agent, pouring into a mold, then performing a curing treatment, and obtaining a finished product; the finished product has the advantages of good rebound elasticity, good compression deformation resistance, good moisture and heat resistance and good tear resistance.

The utility model discloses a kind of high-strength solid wood composite doors, including door body, the frame is equipped in the both sides of door body, solid wood board is equipped in the both sides of door body, the area surrounded by inner frame and solid wood board of door body is door core, door core is bridge hole mechanics board, composite reinforcing layer is equipped between the both sides of bridge hole mechanics board and corresponding solid wood board, several bridge holes are equipped on bridge hole mechanics board, cylindrical steel support is equipped in bridge hole, buffer layer is arranged around the outside of steel support, polyurethane foam filler is filled in steel support.The beneficial effects of the utility model are: the utility model uses bridge hole mechanics board as door core, and inserts steel support therein, can effectively disperse external impact force, improve the impact resistance of door, the overall weight of this structure design door core is reduced, while improving the overall performance of door;Adopt polyurethane foam filler and buffer layer, can effectively reduce the propagation of noise.Excellent anti-deformation performance, composite reinforcing layer improves the bending resistance and tear resistance of door body.

This invention relates to the field of tire technology and discloses a hybrid all-terrain tire that improves off-road performance. The tread blocks on the tire tread interlock with each other in the circumferential and axial directions, and the tread grooves are evenly distributed, improving handling on off-road surfaces. The stepped tread edge design enhances traction while maintaining tire stability. The tread block chamfers improve tear resistance. Stone-expelling tread blocks accelerate the expulsion of stones. The staggered concave and convex shoulder profiles along the tire circumferential direction improve the tire's ability to get out of trouble on soft surfaces. The sidewall tread pattern enhances lateral grip and improves driving safety.

The application relates to a kind of stretch sleeve films, belonging to the technical field of high-strength cold-stretching sleeve film composition.In order to ensure the comprehensive performance of the film, especially the puncture resistance and tear resistance, a large amount of ultra-low density polyethylene resin and propylene-based elastomer need to be added in the formula, wherein the high content of propylene-based elastomer makes the production cost higher.The application comprises a middle layer and an outer layer, the middle layer composition comprises two kinds of metallocene polyethylene with specific density and MFR and propylene-based elastomer;the outer layer composition is metallocene polyethylene with specific density.The film simultaneously has higher tensile property, puncture resistance, tear resistance and resilience, and lower cost, so that the cold-stretching sleeve film has excellent comprehensive performance.

The application discloses a kind of high tenacity special paper preparation methods.This method uses cellulose nanofiber as raw material, by introducing small molecule competitive hydrogen bond effect, destroy the original hydrogen bond network of cellulose and induce molecular chain rearrangement, realize the topological isomerization transformation of cellulose crystal form, so as to significantly improve the fiber surface activity and the adjustable combination between fibers.On this basis, by wet forming and post-processing, the interaction between fibers is regulated, and a paper structure with high strength and high toughness is constructed.The obtained paper significantly improves the breaking elongation and tear resistance while maintaining high tensile strength, overcoming the technical bottleneck that traditional cellulose paper strength and toughness are difficult to consider, suitable for high-performance packaging, functional substrate and flexible device field.

The utility model discloses a kind of high-strength wear-resistant ton bags, it is related to ton bag technical field, including bag body and closure structure;Bag body four sides upper portion is uniformly distributed third reinforcing rib, bottom is formed by transverse first reinforcing rib and longitudinal second reinforcing rib intersection well grid, grid intersection point is linked with third reinforcing rib, constitute three-dimensional stress frame, when hoisting, top first pull rope is connected with third reinforcing rib, middle second pull rope auxiliary dispersion stress, cooperate reinforcing rib and outer protective layer, the suture fixation of tear-resistant reinforcing layer, so that load multilayer structure ordered transmission, improve overall bearing strength and tear resistance performance;When closing, first envelope and fourth envelope are folded towards and cover bag body top, second envelope is turned over with first envelope, third envelope is turned over with fourth envelope, button on second envelope is embedded third envelope buttonhole and form mechanical locking, while first envelope inner wall magnetite and fourth envelope groove inner magnet magnetism suction fit, double effect ensure bag body sealing, prevent material leakage.

This invention discloses a high-ductility, bend-resistant, and brittle-resistant thermally conductive silicone material, comprising, by weight: 90-95 parts of a flexible cross-linked matrix, 180-220 parts of a thermally conductive filler, 1.5-2.2 parts of a silane coupling agent, 0.3-0.6 parts of a platinum catalyst, and 0.8-1.5 parts of a rheology modifier. The flexible cross-linked matrix comprises 70-75 parts of vinyl silicone oil, 8-12 parts of hydrogen-containing silicone oil, and 7-10 parts of a flexible toughening silicone resin modifier. The thermally conductive filler comprises 140-170 parts of spherical alumina and 40-50 parts of boron nitride, wherein the boron nitride is in the form of flake powder. This invention's thermally conductive silicone material, through the design of the flexible cross-linked matrix and the thermally conductive filler components and proportions, significantly improves the material's ductility, resilience, tear resistance, and dynamic heat dissipation performance. The preparation process is simple and controllable, and it can be used for long-term service in dynamically moving heat-generating components.

This invention relates to the field of interior decoration materials, specifically to a paper-based tear-resistant substrate and its preparation method. A method for preparing a paper-textured tear-resistant substrate includes the following steps: S1: preparing a paper-textured slurry; S2: applying the paper-textured slurry to the surface of a non-woven fabric substrate in multiple steps; S3: heating and shaping with a pressure roller, and cooling to obtain a composite substrate; the paper-textured slurry, by weight, includes: 20-30 parts of water-based acrylic resin emulsion, 10-15 parts of water-based polyurethane emulsion, 1-8 parts of modified starch adhesive, 15-25 parts of kaolin, 10-15 parts of heavy calcium carbonate, 5-10 parts of titanium dioxide, 3-5 parts of shell powder, 0.5-2 parts of nanocellulose, 0.5-1 part of dispersant, 0.1-0.5 parts of polyether-modified organosilicon, and water, wherein the amount of water added makes the solid content of the paper-textured slurry 35-50%; the obtained substrate has a paper-textured feel, which facilitates ink adhesion and high-precision printing, and has good tear resistance.

The application relates to the technical field of silicone rubber materials, and discloses a preparation method of high-tear-resistance and environment-adaptability strong fumed silica, the fumed silica and application. The preparation method of the high-tear-resistance and environment-adaptability strong fumed silica is prepared through the steps of base preparation, filler dispersion, heat treatment curing and re-milling, and the weight fractions of various raw materials are specified, in particular, the modified fumed silica method white carbon black of a specific modifier, so that the tear strength, high and low temperature resistance, oil resistance and heat aging resistance of the fumed silica are effectively improved, and the harsh requirements of a new generation of automobiles and high-end equipment on key silicone rubber parts such as high tear resistance and high reliability are met. Meanwhile, the fumed silica prepared by the preparation method of the high-tear-resistance and environment-adaptability strong fumed silica is reasonably compounded by methyl vinyl silicone rubber, modified fumed silica method white carbon black, hydroxyl silicone oil and stearic acid, so that the fumed silica has excellent properties such as high tear resistance and strong environment adaptability.

This utility model relates to the field of pet mat technology and discloses a tear-resistant, anti-slip, and comfortable pet mat, comprising a surface layer, a bottom layer, and an edge strip. The surface layer is made of ultra-high molecular weight polyethylene knitted fabric, and the bottom layer is made of PVC foam material with a mesh backing. The edge strip wraps around the perimeter of the surface layer and the bottom layer and is fixed with stitching. It is also made of ultra-high molecular weight polyethylene knitted fabric. An adhesive layer is provided between the surface layer and the bottom layer. This utility model uses ultra-high molecular weight polyethylene knitted fabric to prevent tearing and puncture. The mat is anti-slip and not easily lifted or turned over. The edge of the edge strip is wide enough to effectively prevent damage from dogs. The entire mat combines tear resistance, anti-slip and waterproof properties, antibacterial and mildew resistance, and elastic comfort. Its simple and compact structure facilitates size customization and mass production, resulting in a high overall cost-effectiveness.

This invention relates to a down jacket thermal insulation fabric containing PCM microcapsules and its production method. The PCM microcapsule-containing down jacket thermal insulation fabric includes an inner layer, a middle layer, and an outer layer connected in sequence. The middle layer includes a protective layer one and a protective layer two respectively disposed on opposite sides of the inner and outer layers. Both protective layers one and two have a continuous alternating concave-convex structure, and the concave positions of the protective layers one and two are correspondingly arranged to form a receiving cavity. This invention can significantly improve the tear resistance, warmth, and down-proof properties of the fabric by setting reinforcement members inside the receiving cavity between protective layers one and two. When the two ends of the support strip extend to both sides to form pressing parts, and the pressing parts extend to the middle of the corresponding protrusions of protective layers one and two for heat-pressing and fixing, the tear resistance, warmth, and down-proof properties of the fabric can be further improved.

The present invention relates to a tire (1) for a vehicle, comprising at least one sidewall (2), with at least one high-contrast sidewall element (3) consisting of a texture comprising raised protrusions (4, 5) relative to a sidewall surface (21) in contact with atmospheric air, and / or recesses (6) relative to the sidewall surface (21). The invention describes a sidewall rubber composition (2) exhibiting a good compromise between tear resistance and rolling resistance. According to the invention, the weight ratio between the reinforcing filler and the plasticizing agent is at most 4.50, the sum of the reinforcing filler and the rubber powder content is at least 30% and at most 70%, and the weight ratio between the rubber powder content and the reinforcing filler is at least 0.20 and at most 2.50. Figure for the abstract: Fig. 1

The application belongs to the technical field of dustproof filtration, and discloses an intelligent dustproof device for a municipal foundation trench and a use method, wherein the intelligent dustproof device for the municipal foundation trench comprises a pair of side rails, a plurality of sliding blocks are slidably connected to the top of the pair of side rails, a driving steel wire is fixed to the sliding blocks on one side, a steel wire suspension cable is fixed to the middle of the sliding blocks on both sides, and the installation plate, rotating rod, extrusion rod and other structures are matched, so that the device can be unfolded into a triangular surface support in strong wind, support is provided on both sides of the dustproof mesh screen, the tearing resistance is good, the use durability of the dustproof mesh screen is effectively improved, and after unfolding, the adjacent two rotating rods can be connected by magnetic attraction sub-catches and magnetic attraction female catches. Thus, the two sides of the dustproof mesh screen form a mesh support, the continuous mesh surface clamps the dustproof mesh screen in the middle, effectively improves the wind resistance, and ensures the use continuity and durability of the dustproof mesh screen.

This utility model relates to the field of coated woven bag technology, and provides a high-toughness coated woven bag for packaging, including a woven bag body. The woven bag body is characterized by being composed of a multi-layered composite structure. Reinforcing lifting components are attached to the outside of the woven bag body. These reinforcing lifting components include annular reinforcing strips located at the lower one-sixth and upper one-third positions of the woven bag body, and U-shaped reinforcing strips connecting the upper and lower annular reinforcing strips on both sides. The U-shaped reinforcing strips on both sides are positioned on the outside of the woven bag body, and lifting handles are provided on both sides of the upper and lower annular reinforcing strips. Through optimized material selection and structural design, this high-toughness coated woven bag for packaging not only possesses excellent moisture-proof, waterproof, UV-resistant, and corrosion-resistant properties, but also high tensile and tear resistance, meeting the demands of modern logistics and transportation for packaging bags with high strength, durability, and environmental adaptability.

This invention discloses a dual-structure compatible adhesive-free self-fusing composite high-temperature resistant material and its dry stepwise preparation method, belonging to the technical field of inorganic-organic composite high-temperature resistant materials. The core of this material consists of 55-80% inorganic refractory chopped fibers and 20-45% organic high-temperature resistant chopped fibers. The organic fibers undergo in-situ fibrillation to construct a three-dimensional interlocking network with the inorganic fibers. No organic adhesive is used throughout the process; the material achieves integral bonding through the self-fusing of the organic fiber surface at 230-310℃. It is compatible with both large-pore continuous porous sandwich structures and discontinuous skeleton structures, and can be adapted for the composite preparation of a full range of organic fibers such as aramid, polyimide, and polyphenylene sulfide, as well as a full range of refractory fibers such as alumina, mullite, and zirconium oxide. This invention solves the defects of existing materials, such as easy separation between layers, high-temperature adhesive failure, simple structure, and narrow substrate coverage. It possesses excellent high-temperature resistance, tear resistance, and bending flexibility. The all-dry, solvent-free process is suitable for large-scale mass production and can be widely used in fire protection, aerospace thermal protection, chemical corrosion protection, and many other fields.

This application discloses a tear-resistant silicone rubber and its preparation method. The tear-resistant silicone rubber comprises: 100 parts of raw silicone rubber, 2-6 parts of hydrogen-containing silicone oil A, 3-8 parts of an interface modifier, 0.05-0.3 parts of a platinum catalyst, 5-10 parts of carbon nanotubes, 5-10 parts of carbon black, and 1-2 parts of a structure control agent. The carbon nanotubes have a metal phthalocyanine complex attached to their surface. The interface modifier molecule contains Si-H and bipyridine groups. The interface modifier is prepared by hydrosilylation of hydrogen-containing silicone oil B with vinyl bipyridine. This application, by introducing a metal phthalocyanine complex onto the surface of carbon nanotubes and using hydrogen-containing silicone oil with bipyridine groups as an interface modifier, enables the silicone rubber to form a dynamic network during crosslinking, thereby achieving good interfacial bonding and significantly improving the tear resistance of the silicone rubber while maintaining excellent toughness.

This invention relates to the field of protective composite materials technology, specifically to a screw-extruded hot-melt composite material of woven Oxford cloth and polypropylene, its preparation method, and its application. The composite material is formed by screw extrusion hot-melt bonding of a polypropylene film layer and a woven Oxford cloth fabric layer. At the interface between the polypropylene film layer and the woven Oxford cloth fabric layer, the polypropylene film layer penetrates into the fiber gaps of the woven Oxford cloth fabric layer, forming a penetration and embedding zone, and / or the polypropylene film layer forms a coating structure on the fiber surface of the woven Oxford cloth fabric layer. This application features high structural strength, excellent impact resistance, strong interfacial bonding, waterproof and moisture-proof properties, good flame retardancy, permanent antistatic properties, dimensional stability, and moldability. It can meet the impact resistance, abrasion resistance, and tear resistance requirements of armor protection scenarios and is also suitable for ceiling protection in cleanrooms, new energy workshops, etc.

The utility model relates to the technical field of flexible high-pressure delivery pipes, in particular to a corrosion-resistant flexible composite high-pressure delivery pipe which comprises a main pipe body, an outer sheath is sleeved on the outer wall surface of the main pipe body, a puncture-resistant and tear-resistant outer sleeve layer is sleeved on the outer wall surface, far away from the main pipe body, of the outer sheath, and a puncture-resistant and tear-resistant inner sleeve layer is arranged on the inner wall surface of the main pipe body. An inner core pipe is arranged on the inner wall face, away from the main pipe body, of the puncture-resistant and tear-resistant inner sleeve layer, a tough inner sleeve is arranged on the inner wall face, away from the main pipe body, of the inner core pipe, and a corrosion-resistant and aging-resistant coating is arranged on the inner wall face, away from the main pipe body, of the tough inner sleeve. A wear-resistant matte coating is arranged on the outer wall face, away from the main pipe body, of the puncture-resistant and tear-resistant outer sleeve layer, and an inner groove and an outer arc fixing face are arranged on the tough inner sleeve. The corrosion resistance and the aging resistance of the inner wall face of the inner core pipe on the flexible high-pressure conveying pipe are improved, the puncture resistance and the tear resistance of the main pipe body are improved, and light pollution to the environment is avoided.

The application discloses a butyl rubber composition which comprises butyl rubber 100 parts by mass, white carbon black 30-50 parts by mass, modified silica gel microparticles 5-15 parts by mass, thermoplastic polyurethane 5-10 parts by mass, and a vulcanization system 8-12 parts by mass; wherein the modified silica gel microparticles are silica gel microparticles grafted by a silane coupling agent. The butyl rubber composition uses butyl rubber as a matrix and uses white carbon black and modified silica gel microparticles as reinforcing fillers, can provide a material basis for significantly improving the wet skid resistance and other properties of vulcanized rubber products, and simultaneously introduces thermoplastic polyurethane to greatly improve the tear resistance and flex resistance, and the multi-component synergy enables the butyl rubber composition to produce high-tough and wear-resistant and anti-skid vulcanized rubber products. Based on this, the application further discloses a preparation method of the butyl rubber composition and a shoe sole preparation method for preparing and applying the aforementioned butyl rubber composition.

The application discloses an insulation protective sleeve, a surgical instrument assembly and a manufacturing method of the insulation protective sleeve, and relates to the technical field of surgical instruments, in particular to an insulation protective sleeve used for wrapping the front end of a surgical instrument, which comprises a first layer and a second layer, the tear resistance of the second layer is greater than that of the first layer, the insulation protective sleeve has a through hole for at least partial extension of an effector located at the front end of the surgical instrument, in the thickness direction of the insulation protective sleeve, the first layer and the second layer are mutually sleeved from outside to inside, the front end of the first layer extends and exceeds the front end of the second layer, the through hole is formed on the first layer, and the rear end of the first layer extends and covers at least the rear end of the second layer. By setting the insulation protective sleeve as a structure in which the first layer and the second layer are mutually sleeved from outside to inside, there is no joint seam on the peripheral side of the insulation protective sleeve, no height difference occurs, and meanwhile, the first layer is an integral structure covering the second layer, and there is no risk of falling off of the front end.

The application belongs to the technical field of insulating work clothes, and particularly discloses a gradient composite insulating boot and a preparation method thereof. The insulating boot adopts an integrated seamless gradient three-layer composite forming structure, and from top to bottom, the three-layer composite forming structure comprises an inner layer skin-friendly insulating buffer lamination layer, a middle layer core high-voltage barrier insulating functional layer, and an outer layer wear-resistant and weather-resistant protective bearing layer. An aramid puncture-resistant core plate is embedded in the boot sole in an integrated manner. An elastic sealing insulating edge is integrally formed at the top of the boot shaft. The gradient composite insulating boot and the preparation method thereof are used, a gradient three-layer functional composite structure is matched with a special modified insulating base material formula, a low-temperature segmented closed-loop vulcanization precise temperature control process is matched, and no additional insulating reinforcing patch and secondary lamination reinforcing process are needed, so that the super-high working frequency voltage resistance, all-weather high and low temperature resistance, acid and alkali aging resistance, high-strength wear resistance, puncture resistance and tear resistance multiple composite performance can be realized simultaneously.

The application relates to the technical field of tensile test, and discloses a kind of paper tearing resistance detection devices, comprising: base;Two groups of symmetrically installed on the base tensile mechanism;Combined humidity adjusting mechanism connected on clamping assembly;Three-dimensional moving platform installed on the base and dripper installed on three-dimensional moving platform;The application is provided with combined humidity adjusting mechanism outside tensile mechanism, can form a sealed chamber outside paper before tension detection to the paper to be measured, and carry out humidity adjustment, so as to simulate and obtain the tearing resistance parameter of paper in different humidity environment in actual use process, and three-dimensional moving platform and dripper capable of quantitative dropping different liquids are matched, the tearing resistance parameter of paper in different position of paper can be further simulated when different amount of liquids such as water and oil exist in the set environment, the tearing resistance parameter of paper in different conditions can be truly obtained, so as to improve the use reliability of paper product.