18results about How to "Increased interlaminar shear strength" patented technology

This invention provides a plasma-modified glass fiber reinforced polyetheretherketone (PEEK) composite material and its preparation method, belonging to the field of glass fiber reinforced materials. The composite material is prepared by treating a PEEK film and glass fiber cloth with glow discharge plasma, followed by hot pressing, resulting in a composite material with good compatibility between PEEK and glass fiber. This method can significantly improve the interfacial bonding strength between glass fiber and PEEK resin, thereby improving the mechanical properties of the composite laminate. The interlaminar shear strength of the composite material is increased by 43% compared to the untreated composite material. Furthermore, this method also has the advantages of energy saving, environmental protection, short processing time, and high efficiency.

The application discloses high-strength composite cement blanket and belongs to the technical field of civil engineering composite materials. The application improves the three-dimensional fabric structure: a three-dimensional weaving is adopted to form a top layer, a middle layer and a bottom layer, wherein the middle layer is formed by a honeycomb three-dimensional structure formed by interweaving vertical fiber filaments and horizontal oblique fiber filaments which are arranged obliquely relative to the vertical fiber filaments; the vertical fiber filaments connect the top layer and the bottom layer; and the horizontal oblique fiber filaments pass through the vertical fiber filaments in an S-shaped wiring mode multiple times to form limiting knots which are distributed in the top layer, the middle layer and the bottom layer to form an overall tensile strength reinforcing structure. The three-dimensional fabric can be combined with a "two cloth and one film" protective layer and a solidifiable composite material containing gold steel sand. The application realizes isotropic reinforcement through the honeycomb structure and builds a mechanical occlusal interface through the S-shaped limiting structure, thereby significantly improving the bending strength, interface adhesion and waterproof durability of the cement blanket, and the application is suitable for slope protection, trench lining and temporary road paving engineering and the like.

The invention belongs to the technical field of road engineering, and discloses a concrete bridge deck pavement structure and a construction method.The concrete bridge deck pavement structure comprises a concrete base layer, the top of the concrete base layer is covered with a waterproof binder, and the top of the waterproof binder is covered with an asphalt concrete mixture; the top of the asphalt concrete mixture is covered with a stone mastic asphalt mixture; the waterproof binder adopts an asphalt binder or an epoxy resin binder; the paving thickness of the asphalt concrete mixture is 4.5 cm, and the paving thickness of the stone mastic asphalt mixture is 4 cm. By optimizing the thickness combination of the upper surface layer and the lower surface layer and improving a waterproof binder material and a forming process, light weight, durability and economization of bridge deck pavement are achieved, and the bridge deck pavement structure can be suitable for bridge engineering in high-temperature and rainy areas.

This invention provides a sandwiched pressure hull structure and its processing method, relating to an underwater vehicle structure, including an inner hull, an outer hull, and an intermediate sandwich layer located between the inner and outer hulls. The intermediate sandwich layer includes hollow glass microspheres, reinforcing fibers, and epoxy resin. The spherical hollow glass microspheres and reinforcing fibers are uniformly mixed in the epoxy resin and placed in a fluidized state between the inner and outer hulls. After vacuum curing, they form a buoyancy material located between the inner and outer hulls. This invention addresses the problems of insufficient load-bearing capacity and low specific strength and specific stiffness of the pressure hulls of underwater vehicles in the prior art.

The application discloses a kind of PEI or PEEK-based 3D printing wave-absorbing materials and preparation method thereof.The 3D printing wave-absorbing material includes the following components by mass fraction: polyetherimide resin or polyether ether ketone resin: 45~65 parts;Electromagnetic wave absorber: 10~50 parts;Impact modifier: 4~12 parts;Flow aid: 2~8 parts;Antioxidant: 0.5~3 parts;Wherein, the electromagnetic wave absorber includes magnetic absorber and carbon-based absorber, the impact modifier and the carbon-based absorber are pre-coated to form the carbon-based absorber coated with the impact modifier on the surface, and the magnetic absorber is surface modified by silane coupling agent.The application significantly improves the mechanical properties and thermal stability of the material by using specific raw material composition and combining specific multi-layer co-extrusion and online heat treatment process.The preparation process is simple and easy to operate, and is suitable for industrial continuous production.

This application discloses a method for preparing a double-needle stitched reinforced wall panel structure, relating to the field of fiber composite material reinforcement technology. The method includes the following steps: designing and machining a digital model of a double-needle stitching mold based on the reinforced wall panel structure; creating oblique grooves along the stitching direction in the double-needle stitching mold, the depth and width of which are adapted to the movement trajectory of the double needles; cutting carbon fiber cloth as reinforcing layer and skin layer according to the reinforced wall panel structure; stacking the reinforcing layer and skin layer on the double-needle stitching mold in a predetermined order and fixing them; using a double-needle stitching device, simultaneously stitching the flanges of the reinforcing layer and skin layer along the stitching path to form a double-stitch preform; impregnating the double-stitch preform with resin using a vacuum-assisted liquid molding process, and curing it to obtain the reinforced wall panel structure. This application is the first to apply double-needle synchronous stitching technology to mainstream reinforced structures without foam cores, solving the problem of insufficient interlayer strength in traditional adhesive / co-curing processes, and can cover most reinforced wall panel structural forms in the aerospace field.

The invention discloses a target head cover structure based on winding and needling processes and a forming method of the target head cover structure, and belongs to the technical field of composite material structure manufacturing. Comprising a head cap and a cover body, the head cap is inserted into the mortise of the cover body through the tenon and is sewn and fixed through sewing fibers; the head cap and the mask body are sewn and then jointly subjected to chemical vapor infiltration and reactive infiltration densification treatment, so that in a connecting interface area of the head cap and the mask body, sewn fibers and carbon and silicon carbide matrixes generated in situ in the densification process are interwoven and embedded, and a three-dimensional continuous enhanced interface structure is jointly formed. According to the structure, an independent physical interface formed by an adhesive or a mechanical connecting piece is eliminated at the joint of the head cap and the mask body, so that structural fusion of the head cap and the mask body is realized. According to the invention, through a synergistic process of joggling, sewing and co-densification, the integrated forming of the component is realized, and the integrity, the bearing capacity and the production efficiency of the structure are remarkably improved while the product consistency is ensured.

The invention relates to a structural battery based on integration of a honeycomb composite material and an electrochemical energy storage unit. According to the structural battery, a force bearing function and an electric energy storage function are combined. According to the battery, a bionic honeycomb composite material is adopted as a matrix, and a lithium ion electrochemical unit is embedded into the matrix, so that the multifunctional structure battery with high mechanical strength and excellent electrochemical performance is formed. The honeycomb composite material is used as a carrier and an ion transmission channel of an electrode active material, and is also used as a bearing structure of a mechanical load. According to the design, the energy density, the safety and the cycle life of the battery are remarkably improved, and the battery is particularly suitable for the fields of electric automobiles, aerospace and the like with relatively high requirements on light weight and space utilization rate.

The invention relates to the technical field of composite material magnesium alloy pipe component forming and manufacturing, in particular to a thermoplastic carbon fiber reinforced magnesium alloy composite pipe differential temperature air pressure regulation and in-situ reinforcement integrated forming method which comprises the steps that a magnesium alloy pipe blank is subjected to heat treatment; magnesium alloy pipe blank surface treatment; assembling a magnesium alloy composite pipe prefabricated body; a differential temperature field is constructed for the magnesium alloy composite pipe, so that the thermoplastic resin in the magnesium alloy composite pipe enters a viscous flow state while the magnesium alloy keeps good plasticity; then air pressure and axial feeding cooperative loading is carried out, and precise forming of the mold is achieved; the magnesium alloy composite pipe component is subjected to differential temperature cooling, thermoplastic resin is promoted to be fully infiltrated by means of radial shrinkage compressive stress generated at the interface by means of thermal expansion difference caused by inner and outer layer temperature difference, and in-situ enhancement of the interface of the magnesium alloy composite pipe is achieved; the requirements of high-end equipment for high-performance and high-efficiency preparation of the magnesium alloy composite pipe are met with high integration level and high strength.

This invention discloses a carbon fiber composite material for rail transit vehicles and its preparation process, relating to the field of carbon fiber composite material technology. The method uses carbon fiber cloth as a matrix, depositing a polydopamine layer on its surface, then loading graphene epoxide, and using the polydopamine layer to grow manganese dioxide nanosheets in situ to obtain a carbon fiber matrix. Epoxy resin is then prepolymerized by pouring it into a mold, and the carbon fiber matrix is ​​laid flat in the prepolymerized resin. Epoxy resin is then poured in again, and the mixture is heated and cured under a pressure of 45–50 N to obtain the carbon fiber composite material. The carbon fiber composite material prepared by this method exhibits excellent mechanical properties, with improved tensile strength and interlaminar shear strength, and can be widely used in vehicles, ships, and other fields, demonstrating high practicality.

This invention discloses a method for preparing carbon fiber epoxy composite materials that combine high mechanical properties and a low coefficient of thermal expansion. Belonging to the field of composite materials, it addresses the technical challenge of simultaneously improving the mechanical properties and reducing the coefficient of thermal expansion of composite materials using existing carbon fiber processing methods. By non-covalently modifying carbon nanotubes with ionic liquids, unlike traditional covalent modification methods, the intrinsic strength of carbon nanotubes is preserved, constructing a multi-mechanism synergistic interface reinforcement system. This specifically addresses the key problems of traditional sizing agents having a single interfacial effect and hindered stress transmission. In this invention, flexible polyimide acts as a bridge at the interface, while rigid carbon nanotubes construct an effective armor on the fiber surface. The two form a rigid-flexible composite structure at the interface, which effectively alleviates interfacial stress concentration, significantly improves interfacial stress transmission efficiency, achieves uniform dispersion of external loads, and ultimately improves the mechanical properties of the carbon fiber epoxy composite material.

The utility model discloses a preparation device of a novel high-strength FRP pipe core for electrolytic copper foil, which comprises a steel core mold, a laying device is arranged right above the steel core mold, a grid fiber layer is sleeved outside the laying device, one side of the steel core mold and one side of the laying device are connected with a winding machine moving frame in a sliding mode, and the winding machine moving frame is connected with a winding machine. A driving mechanism used for driving the winding machine moving frame to move in a reciprocating mode is arranged below the winding machine moving frame, one side of the outer wall of the winding machine moving frame is rotationally connected with winding heads distributed at the inclination angle of 30 degrees, and the other side of the outer wall of the winding machine moving frame is fixedly connected with a gum dipping groove. According to the utility model, the grid fiber layers which are laid in an inclined and crossed manner by 30 degrees are additionally arranged and form an orthogonal interaction locking interface with the wound linear fiber layers, so that the defect of traditional single-direction fiber arrangement is overcome, and under the same strength, the grid layer and linear layer composite structure can reduce the wall thickness of the tube core, reduce the weight of a single tube core, improve the radial compression strength and improve the tensile strength of the tube core. And high-strength and light-weight tube core preparation is realized.

The application discloses a kind of high-performance glass fiber reinforced polypropylene composite material and preparation method thereof, it is related to high molecular composite material technical field;The application constructs the co-continuous gradient transition layer by polypropylene oligomer between glass fiber surface and polypropylene matrix, the polypropylene oligomer in the transition layer is gradually decreased in concentration in the direction from glass fiber surface to polypropylene matrix, concentration adjacent glass fiber surface is higher than adjacent polypropylene matrix concentration, so that there is no clear interface boundary between glass fiber and polypropylene matrix;The application passes through high concentration and low concentration polypropylene oligomer solution by layer gradient impregnation process in sequence by glass fiber, after drying, and polypropylene matrix is fused and is compounded so that gradient transition layer and matrix form molecular chain entanglement network, stress transmission mode is changed from jumping type to continuous type, and stress concentration point in traditional two-phase structure is eliminated.

The invention discloses a carbon fiber sizing agent and a preparation method and application thereof, particularly relates to the technical field of carbon fiber sizing agents, and is characterized in that the carbon fiber sizing agent is prepared from epoxy resin and auxiliaries, the epoxy resin is at least one of bisphenol A epoxy resin or phenolic aldehyde modified epoxy resin, and the auxiliaries are epoxy resin. The auxiliaries comprise a flexibilizer, a soaking agent, a softening agent, a moisture absorbent and an emulsifier, the flexibilizer is one or more of polyether polyol or hydroxyl-terminated polybutadiene, the soaking agent is a nonionic surfactant, the softening agent is one or more of fatty acid ester or fatty acid amide, and the moisture absorbent is one or more of polyisobutylene or polyisobutylene. The moisture absorbent is one or more of glycerol or sorbitol, the emulsifier is a nonionic surfactant, the concentration of the sizing agent is easy to control, the binding force between the sizing agent and the carbon fiber surface is strong, and the compatibility between the sizing agent and a resin matrix is good.

This invention relates to the field of triazine polymer preparation technology, specifically to a triazine polymer, a high-temperature resistant carbon fiber sizing agent, a preparation method, and applications. The main chain segment of the triazine polymer is a triazine structural unit. The triazine polymer is modified by synergistically introducing two different structures: R2 is a structural unit formed by removing hydroxyl hydrogen atoms from an aromatic dihydroxy compound with a rigid aromatic backbone or aromatic ketone structure, used to improve compatibility with high-temperature resistant thermoplastic resins; R3 is a structural unit formed by removing hydroxyl hydrogen atoms from an aromatic dihydroxy compound with a large-volume substituent or lactone structure, disrupting the tight packing of the molecular chain and improving the solubility of the polymer. The triazine polymer is used in the preparation of a carbon fiber sizing agent, giving the sizing agent excellent heat resistance. This sizing agent can withstand the high-temperature molding and processing environment of special engineering plastics, resulting in a novel carbon fiber sizing agent that simultaneously possesses excellent heat resistance and interfacial compatibility.

The invention provides a high-bending-resistance moisture-proof corrugated board which sequentially comprises a paper core layer, a middle layer and a surface layer from top to bottom, honeycomb-shaped elastic rods and staggered supporting corrugations are embedded in the paper core layer, raw materials of the paper core layer comprise small paper balls made of 30% bamboo wood pulp and waste paper residues, and the diameter of each small paper ball is smaller than or equal to 20 mm; the surface layer comprises a mixed layer of sisal fibers and abaca fibers, the ratio of the sisal fibers to the abaca fibers is 3: 1-5: 1, the surface of the surface layer is coated with a dynamic waterproof layer, the dynamic waterproof layer is composed of hydroxylated graphene modified polyacrylate emulsion, and the mass ratio of slurry to a waterproof agent is 40: 1; and the interlayer is a glass fiber gridding cloth composite layer. The compression resistance is improved, the rebound resilience is enhanced, and the moisture absorption problem of the core layer is effectively solved.

The invention belongs to the technical field of polymer composite materials and structural engineering materials, and particularly relates to a thermoplastic composite structural plate based on continuous fiber reinforcement and a preparation method of the thermoplastic composite structural plate. The composite structural plate is prepared from modified polyaryletherketone, 2, 4, 6-trihydroxymethyl phenol, continuous carbon fiber fabric, a compatible flexibilizer, an antioxidant, a heat stabilizer and a lubricating dispersant. Wherein the modified polyaryletherketone is prepared through aromatic ring bromination, alkynyl grafting and in-situ graphdiyne construction reaction, a short-distance graphdiyne pi-segment structure is formed in the hot press molding stage, and a stable pi-pi conjugated interface is generated on the surface of the carbon fiber. The method comprises the steps of resin modification, mixing granulation, fiber impregnation and hot press molding. Compared with a traditional system, the interlaminar shear strength, bending strength and thermal deformation temperature of the material are remarkably improved, and the material has excellent interface bonding force, thermal stability and fracture toughness and is suitable for the fields of aerospace, rail transit and high-performance structural components.

This invention belongs to the field of high-performance composite materials and individual / light armor protection technology, specifically involving a gradient self-healing basalt fiber composite ceramic armor plate and its preparation method. It employs a three-dimensional woven structure to physically eliminate the layering interface, utilizing an integrally continuous fiber skeleton to achieve continuous load transfer, transforming the armor from "interlayer physical stacking" to "structural integration," effectively improving the problem of interlayer delamination. The invention uses slurry impregnation combined with multi-dimensional gradient zoning to effectively balance "deep damage repair" and "damage resistance." Preliminary layered impregnation of components is achieved through "sidewall graded interface directional flow," and is immediately combined with "stepwise in-situ gelation" to construct a temporary physical barrier layer, realizing the construction of a precise gradient structure within the interconnected pores.