24results about How to "Improve bending strength" patented technology

The invention relates to a zirconia-based all-ceramic false tooth and a preparation method thereof. A core layer of the zirconia-based all-ceramic false tooth is prepared from the following components in parts by mass: 90 to 94 parts of ZrO2, 5 to 9 parts of Y2O3, 0.1 to 0.5 part of Al2O3, 0.01 to 0.5 part of Fe2O3, 0.01 to 0.5 part of Er2O3 and 0 to 0.2 part of MnO2, and a shell layer of the zirconia-based all-ceramic false tooth is prepared from the following components in parts by mass: 24.5 to 49.5 parts of CaCO3, 45 to 50 parts of SiO2, 0 to 25 parts of MgO, 0.01 to 0.5 part of Fe2O3, 0.01 to 0.5 part of Er2O3 and 0 to 0.2 part of MnO2. The preparation process comprises the following steps: performing dry pressing and isostatic pressing on raw materials of the core layer, presintering, and carving to obtain a zirconia-based false tooth biscuit; meanwhile, calcining raw materials of a shell layer, then adding deionized water, a dispersing agent and an adhesive, and carrying out ball milling and mixing to obtain calcium-magnesium-silicon-based ceramic slurry; and coating the calcium-magnesium-silicon-based ceramic slurry on the surface of the zirconium oxide-based false tooth biscuit, and sintering to obtain the zirconium oxide-based all-ceramic false tooth provided by the invention. The zirconia-based all-ceramic false tooth has good jade texture and is closer to the natural color of natural teeth.

The application discloses a lithium-free high-heat-resistant ceramic mud and a preparation method thereof, and relates to the technical field of ceramic materials. In the preparation of the lithium-free high-heat-resistant ceramic mud, alumina is reacted with 3-(2,3-epoxypropoxy) propyl trimethoxysilane to obtain pre-modified alumina; the pre-modified alumina is reacted with starch to obtain modified alumina; ethyl acetoacetate, isopropyl alcohol, zirconium oxychloride, aluminum sec-butoxide, polyvinylpyrrolidone and N-N dimethylformamide are mixed to form a spinning solution, the spinning solution is electrospun, and then immersed in yttrium oxide sol to obtain alumina-zirconia-yttria composite fibers; the modified alumina, talc, alumina-zirconia-yttria fibers, hydroxypropyl methyl cellulose, glycerol, oleic acid, polyethylene glycol and water are stirred and mixed, and vacuum pugging is carried out to obtain the lithium-free high-heat-resistant ceramic mud. The lithium-free high-heat-resistant ceramic mud prepared by the application has good thermal shock resistance and bending strength after sintering.

The present application relates to the technical field of bamboo fiber composite material, in particular to a purification preparation method of bamboo fiber reinforced natural polymer composite material. The bamboo raw material is crushed and treated by steam explosion to obtain primary bamboo fiber; the primary bamboo fiber is sequentially subjected to organic solvent dewaxing treatment and oxidation system selective delignification treatment to obtain purified bamboo fiber; the purified bamboo fiber is treated in a tannin acid solution to form a polyphenol interface layer on the surface thereof; and a solution containing polyvalent metal ions is added to the treated bamboo fiber to form a coordination cross-linking interface layer on the surface of the bamboo fiber. The present application constructs a stable interface layer between the fiber and the natural polymer matrix. The interface layer can effectively transfer stress, significantly improve the tensile strength, bending strength and shear strength of the composite material, and solve the problem of weak interface and easy delamination of traditional natural composite materials.

This invention discloses a low-temperature resistant plastic bucket and its preparation method, belonging to the field of plastic bucket technology. This invention utilizes the synergistic effect of maleic anhydride-grafted ethylene-octene copolymer, nano-aluminum nitride, and cold-resistant toughening agent, combined with gradient injection molding, gradient annealing, and low-temperature aging processes to eliminate internal stress in the product. This allows the product to possess excellent tensile strength, flexural strength, and drop resistance reliability at -10℃. Under full load, the drop height can reach 1.2m without cracking or leakage. The synergistic effect of each component achieves a balance between low-temperature toughness and structural strength, significantly improving the stability and service life of the plastic bucket under low-temperature conditions.

This invention provides an epoxy resin-based composite waterproofing material, its preparation method, and its application. After curing, the epoxy resin-based composite waterproofing material exhibits high flexural strength and Shore hardness, as well as excellent oil penetration resistance. It is suitable for coating the tank walls, bottom plates, and floating roof surfaces of oil storage tanks, curing to form a waterproofing layer. This enhances the oil storage tank's resistance to oil leakage, thereby extending its service life and preventing economic losses and environmental hazards caused by oil leakage.

The application discloses a kind of high-performance outdoor full package imitation wood composite board and preparation method thereof, relate to polyurethane composite board technical field, the full package imitation wood composite board includes base board, and the polyurethane material of setting in the lower surface and the four around of base board, and the resin material of setting in upper surface.Its preparation method includes the following steps: pouring polyurethane material in the silica gel mould after surface treatment, place base board, mould pressing, make the polyurethane material with wood texture around and lower surface of base board composite, obtain intermediate product A;Resin material is rolled on the upper surface of intermediate product A, and is dried, to obtain full package imitation wood composite board;The silica gel mould after surface treatment is prepared by transferring real solid wood board texture.

The invention relates to the technical field of polymethyl methacrylate, and discloses a flame-retardant polymethyl methacrylate material and a preparation method thereof.The flame-retardant polymethyl methacrylate material is obtained by reacting polymethyl methacrylate, a hydroxyl-terminated flame retardant and p-toluenesulfonic acid. The linear polymethyl methacrylate is crosslinked into a three-dimensional network structure, so that the crosslinking degree between molecular chains is enhanced, the molecular chains are not easy to slip under stress, good structural stability is maintained, and the polymethyl methacrylate has high tensile strength and bending strength. The flame retardant contains piperazine rings and phosphate structures, forms an intumescent flame-retardant system, generates phosphoric acid substances, nitrogen and other gases during combustion, promotes dehydration of a matrix to form an intumescent carbon layer, isolates oxygen, prevents heat conduction, inhibits the combustion process, remarkably reduces the peak value of the heat release rate and the total heat release amount, and has excellent flame-retardant performance.

The application belongs to the field of high polymer materials, and particularly discloses a modified basic magnesium carbonate and a PA12 composite material and a preparation method thereof.The preparation method of the modified basic magnesium carbonate comprises the following steps: adding sodium carbonate and magnesium chloride into a sodium hydroxide solution to perform a water bath reaction to obtain the basic magnesium carbonate; adding the basic magnesium carbonate and acrylic acid into deionized water to perform a water bath reaction to obtain acrylic acid modified basic magnesium carbonate; and adding the acrylic acid modified basic magnesium carbonate, glycidyl methacrylate and an initiator into an organic solvent aqueous solution to perform a water bath reaction to obtain the modified basic magnesium carbonate.The modified basic magnesium carbonate prepared by the application can decompose and absorb heat at high temperature, release water vapor and carbon dioxide and other non-combustible gases, dilute the oxygen concentration on the surface of the combustion object, and reduce the temperature of the combustion area, so as to play a role in flame retardation.In addition, the magnesium oxide produced by decomposition covers the surface of the material to form a protective layer, and further prevents the combustion.

The application discloses a kind of thermosetting resin materials for semiconductor chip sealing and preparation method thereof, it is related to epoxy resin technical field.The thermosetting resin materials for semiconductor chip sealing, including the following weight fraction raw materials: epoxy resin 50-60 parts, modified benzo-oxazin 10-15 parts, toughening agent 4-6 parts, inorganic filler 250-300 parts, silane coupling agent 10-15 parts, release agent 1-2 parts, curing agent 25-30 parts, curing accelerator 0.5-0.8 parts;The thermosetting resin materials for semiconductor chip sealing prepared by the application has excellent spiral flow length, bending strength, thermal conductivity, glass transition temperature and lower water absorption.

This invention belongs to the technical field of plastic packaging bottles, specifically relating to a bio-based degradable cosmetic plastic packaging bottle and its preparation method. The packaging bottle is prepared from the following raw materials in parts by weight: 60-80 parts of compounded polylactic acid; 10-25 parts of polybutylene adipate terephthalate; 10-20 parts of modified bamboo powder; 2-8 parts of epoxidized soybean oil; 1-2 parts of anti-hydrolysis agent; 0.1-0.5 parts of antioxidant; and 0.1-0.5 parts of opening agent. The packaging bottle prepared by this invention simultaneously possesses high tensile strength, elongation at break, flexural strength, and notched impact strength, and exhibits excellent weather resistance.

This utility model discloses an interventional puncture needle, relating to the field of medical device technology. It includes a needle hub and a needle tube. One end of the needle tube is fixedly connected to the needle hub, and the other end is the puncture end. The outer wall of the needle tube is provided with three sections of composite texture. The outer wall of the puncture end of the needle tube has a double-helix cross-shaped groove. The outer wall of the middle section of the needle tube has a reverse-interlaced variable-pitch spiral pattern. The outer wall of the section of the needle tube near the needle hub has a wavy groove. The double-helix cross-shaped groove, the reverse-interlaced variable-pitch spiral pattern, and the wavy groove on the outer wall of the needle tube can generate obvious echo signals under the action of ultrasound. These echo signals form a clear imaging effect in the ultrasound image, significantly improving the clarity and stability of ultrasound imaging. Furthermore, the wavy groove can reduce needle tip stress and improve the bending strength of the needle tube, providing a more precise and safer tool for interventional medical treatment.

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.

This application relates to a metal-based carbon fiber composite material, its preparation method, and metal-based carbon fiber products. The preparation method includes: mixing chromium powder, titanium powder, tungsten powder, nickel powder, carbon fiber, and a binder, and then pressing the mixture to prepare a metal-based carbon fiber composite green body; sintering the metal-based carbon fiber composite green body to prepare a matrix; and depositing carbon on the surface of the matrix using chemical vapor deposition to prepare the metal-based carbon fiber composite material. After sintering, the chromium powder, titanium powder, tungsten powder, nickel powder, and carbon fiber produce chromium carbide, titanium carbide, tungsten carbide, and nickel carbide. The chromium powder, titanium powder, tungsten powder, and nickel powder undergo a solid solution reaction to form a carbide alloy, and the carbides and carbide alloys intertwine. Further carbon deposition on the surface of the matrix using chemical vapor deposition is then performed. The interaction of these steps simultaneously improves the compressive strength, flexural strength, and Vickers hardness of the metal-based carbon fiber composite material.

This invention relates to the field of metallic materials technology, specifically disclosing a lightweight, high-strength seamless steel pipe for fitness equipment and its manufacturing process. The manufacturing process for the lightweight, high-strength seamless steel pipe for fitness equipment includes the following steps: 1. Normalizing a high-strength low-alloy steel pipe to obtain a pre-treated steel pipe; 2. Polishing the surface of the pre-treated steel pipe to obtain a polished steel pipe; 3. Spraying a protective liquid onto the surface of the polished steel pipe and drying it to obtain a pre-protected steel pipe; 4. Heating the pre-protected steel pipe to 100-105℃, holding it at that temperature for 20-30 minutes, and allowing it to cool naturally to obtain the lightweight, high-strength seamless steel pipe for fitness equipment. The protective liquid includes: solvent, water-based acrylic resin, film-forming aid, filler, coupling agent, processing aid, and modifier; the modifier is a compound of guar gum, guar gum, and jujube gum. This invention has the advantage of further improving the corrosion resistance of the lightweight, high-strength seamless steel pipe.

This invention relates to a heat transfer protective film for metal corrosion protection, comprising a heat-resistant layer coated on one side of a base film, and an adsorption layer, a strong anode layer, and a weak anode layer sequentially coated on the other side of the base film. Sacrificial anode cathodic protection is an effective method for metal corrosion protection, while heat transfer technology transfers graphic coded information onto a substrate using a heat transfer printer or similar method. Because the coating can be prepared in advance, it can form heat transfer protective films with multiple functions. By preparing an anode coating containing an active metal, coating it as a heat transfer protective film, and then transferring it onto a metal substrate, the sacrificial anode material protects the cathode metal while imparting graphic coded information to the metal substrate. This represents a new metal corrosion protection mode that adapts to the development of the information age.

This invention discloses a continuous glass fiber reinforced polypropylene material and its preparation method, belonging to the field of high-performance polypropylene technology. The material, by weight, comprises: 70-80 parts polypropylene; 15-30 parts modified continuous glass fiber; 5-10 parts hollow glass microspheres; 1-2 parts polyolefin elastomer; and 0.5-2 parts reaction aid. The beneficial effects of this invention are: it prepares a high-strength, high-rigidity, and excellent impact-resistant modified polypropylene material; the continuous glass fiber is modified with a silane coupling agent, one end of which chemically reacts with the silanol groups on the surface of the glass fiber / microspheres, while the other end physically entangles or becomes compatible with the polypropylene matrix; thereby achieving uniform distribution and optimizing the performance of the composite material, significantly improving the tensile strength, notched impact strength, and flexural strength of the material.

The invention relates to an anti-bending leakage coaxial cable which comprises an inner conductor layer, an insulating medium layer, an outer conductor layer and a sheath which are sequentially arranged from inside to outside, and further comprises a plurality of buckles. According to the bending-resistant leakage coaxial cable, in the production process of the outer conductor layer, the buckle can directly utilize self elastic deformation to be arranged on the outer side of the outer conductor layer in a sleeving mode, the bending-resistant strength of the section where the leakage hole is located is enhanced, and the bending-resistant leakage coaxial cable has very high feasibility in technology. When the leaky coaxial cable is laid, the leaky coaxial cable is preferentially bent at a position far away from the buckle when encountering a 90-degree turning laying space, and the deformation of the leaky coaxial cable at the position where the buckle is located is relatively small, so that the deformation of the outer conductor layer and the corresponding inner conductor layer at the section where the leakage hole is located is remarkably reduced, and the signal transmission performance is prevented from being attenuated. In a laying environment represented by an underground garage, the leaky coaxial cable has good local bending resistance when being laid at a large number of turns, and the signal transmission performance is guaranteed.

This application relates to the technical field of fiberglass reinforced plastics (FRP), and in particular to an unsaturated polyester resin for FRP, a method for preparing the same, and FRP. The unsaturated polyester resin comprises the following raw materials in parts by weight: diols: neopentyl glycol 22-30 parts, 2,2-diallyl bisphenol A 2-4 parts, and bisphenol fluorene 5-9 parts; diacids: isophthalic acid 5-15 parts, terephthalic acid 5-15 parts; acid anhydrides: phthalic anhydride 3-15 parts, maleic anhydride 5-17 parts; toughening agent: double-ended hydrogen-capped silicone oil 5-9 parts; platinum catalyst: the amount of platinum catalyst added is 30-150 ppm of the total mass of 2,2-diallyl bisphenol A and double-ended hydrogen-capped silicone oil; diluent 25-45 parts; polymerization inhibitor 0.01-0.06 parts. It has the advantage of improving the hardness and toughness of the unsaturated polyester resin, thus enhancing its corrosion resistance.

This invention discloses a method for preparing oriented long fiber reinforced polyimide foam material, comprising: adding fatty alcohol, aromatic dianhydride and end-capping agent to a solvent for esterification reaction; adding diamine to continue the reaction; drying to remove solvent and obtain RTM-type foamable precursor; mixing and extruding linear thermoplastic polyimide resin with RTM-type foamable precursor, uniformly distributing long fibers on the inner wall of a custom die head, achieving tight encapsulation of oriented long fibers during extrusion; cutting the material to a fixed length and completing volumetric foaming in a foaming mold. This invention also discloses an oriented long fiber reinforced polyimide foam material, using long fibers as reinforcement and a mixed extrudate of linear thermoplastic polyimide resin and RTM-type foamable precursor as the matrix, which improves the flexural strength, compressive strength and toughness of the polyimide foam material, and can be applied to foam sandwich materials in the aerospace field, radar dome sandwich materials, etc.

The application relates to the technical field of ceramic preparation, and provides a preparation method of high-thermal-conductivity aluminum nitride ceramic, which solves the problems of relatively poor thermal conductive performance and bending strength of the aluminum nitride ceramic prepared by the prior art; the method comprises the following preparation steps: 1) raw material preparation; 2) ball milling mixing; 3) preheating reduction; and 4) hot-pressing sintering.

The utility model provides a kind of glass lining paper, which is a non-woven fabric with a predetermined bending strength. The glass lining paper is a non-woven fabric with a thickness of 60 μm or more and 160 μm or less. For a first test piece cut from the non-woven fabric to 20 mm x 150 mm, the sag length is 70 mm or less when measured by the stiffness measurement method specified in the B method of JIS-L1096-2010, with a protruding length of 100 mm. With this structure, a glass lining paper formed from a non-woven fabric with a predetermined bending strength can be provided that suppresses the thickness of the glass when laminated. This can suppress the generation of particles when the glass lining paper is laminated, and the glass using the glass lining paper can not only maintain cleanliness, but also handle the laminate laminated in a longitudinal orientation.

This invention provides an ultra-thin metal composite panel, comprising a metal plate body, with hot-dip galvanized steel plates disposed on the outer side of the metal plate body. Toughness composite units are located between the hot-dip galvanized steel plates to enhance the toughness of the metal plate body. A ceramic coating is disposed on the outer side of each hot-dip galvanized steel plate. The ultra-thin metal composite panel of this invention effectively ensures the overall strength of the metal plate body while increasing its bending strength and impact resistance, thereby enhancing its impact resistance and effectively reducing the inconvenience caused to users by impact-induced damage.

This invention provides a core-shell nanoparticle-modified epoxy resin and its preparation method, relating to the field of functional polymer materials technology. The method includes the following steps: preparing SiO2 nanoparticles using the Stöber method; in-situ polymerization of dopamine on the surface of the obtained SiO2 nanoparticles via molecular self-polymerization to prepare core-shell nanoparticles SiO2@PDA; using TDE-85 type epoxy resin as the matrix and core-shell nanoparticles SiO2@PDA as the modifier, preparing SiO2@PDA / EP modified epoxy resin by solution blending. The core-shell nanoparticles prepared by this invention not only have good interfacial bonding with the epoxy resin matrix but also exhibit a synergistic effect of scattering and absorbing ultraviolet light. The prepared SiO2@PDA / EP modified epoxy resin exhibits superior toughness, higher flexural strength, and excellent ultraviolet shielding performance.