21results about How to "Control mechanical properties" patented technology

The invention provides a polyurethane material with ionic interaction and a preparation method thereof, and relates to the technical field of polyurethane materials. The preparation method comprises the following steps: mixing polyol, diisocyanate, an organic solvent and a catalyst, and carrying out prepolymerization reaction to obtain an isocyanate-terminated polyurethane prepolymer; the isocyanate-terminated polyurethane prepolymer and a chain extender are mixed for a chain extension reaction, and a chain extension product is obtained; mixing the chain extension product with an end-capping reagent, and carrying out an end-capping reaction to obtain a polyurethane material with ionic interaction; the end-capping agent has a hydroxyl group and a positive ion group. According to the invention, ionic groups are introduced into a molecular structure, and ionic bonds are formed among polyurethane molecular chains, so that the polyurethane material with ionic interaction is obtained. The polyurethane material provided by the invention not only shows excellent mechanical properties (high strength, high toughness and high stretchability), but also has excellent heat resistance, and is expected to be applied to extreme conditions or complex environments.

The invention relates to a high-entropy alloy with excellent creep property and a preparation method thereof. The alloy is expressed as FeaCobCrcNidTapAlqMn by atomic mole percentage, and 10 < = a < = 20, 20 < = b < = 25, 10 < = c < = 20, 25 < = d < = 35, 5 < = p < = 10, 0 < = q < = 8, and 0 < = n < = 5. The preparation method comprises the steps that all the raw materials are taken according to the designed components, then smelting is conducted under the protective atmosphere, and after solid solution water quenching treatment, hot rolling treatment and secondary solid solution treatment are conducted, heat preservation is conducted at the temperature of 750-950 DEG C, and then quenching is conducted. The product is obtained by reasonably regulating and controlling components and performing thermal deformation and thermal treatment processes. Under the high-temperature creep condition of 750 DEG C / 350 MPa, the service life of the obtained product reaches up to 1245 h and is far longer than that of similar products, the room-temperature tensile strength is larger than 1.5 GPa, the bottleneck that a Laves type eutectic high-entropy alloy does not have room-temperature tensile plasticity is broken through, and wide engineering application prospects are achieved.

The invention discloses a PBAT foam material and a preparation method thereof.The preparation method specifically comprises the steps that terephthalic acid and adipic acid are blended with 1, 4-butanediol to obtain PTA / BDO slurry and AA / BDO slurry, the PTA / BDO slurry and the AA / BDO slurry are esterified respectively, and two oligomers are obtained; the preparation method comprises the following steps: mixing the two oligomers, further esterifying to obtain a PBAT oligomer, carrying out polycondensation on the PBAT oligomer, pelletizing, drying to obtain PBAT particles, carrying out vacuum drying, manufacturing a plate, and foaming. The PBAT foaming material with different mechanical properties (strength and hardness) can be prepared by regulating and controlling a PBAT synthesis process, changing the sequence structure and distribution of different chain segments on a PBAT molecular chain and combining a supercritical carbon dioxide solid foaming processing technology, so that the PBAT foaming material is suitable for cushion packaging materials under different packaged articles and different transportation and storage environment conditions.

The invention discloses a corrosion-resistant graphene-modified epoxy resin floor paint and a preparation method thereof. The preparation method comprises, by weight, adding 0.5 to 5 parts of modified graphene oxide to 30 to 60 parts of a curing agent to obtain a mixture; mixing the mixture, 80 to 120 parts of a waterborne epoxy resin, 20 to 30 parts of a pigment filler, 1 to 2 parts of a leveling agent, 0.5 to 1 part of a defoaming agent, and 0.5 to 1 part of a dispersant to obtain the corrosion-resistant graphene-modified epoxy resin floor paint. The invention adds modified graphene oxide to the epoxy resin floor paint to obtain the corrosion-resistant graphene-modified epoxy resin floor paint, and the corrosion-resistant graphene-modified epoxy resin floor paint coating also has a strong anti-corrosion ion protection effect when immersed in seawater for a long time; at the same time, the mechanical properties of the corrosion-resistant graphene-modified epoxy resin floor paint coating can be regulated by adjusting the amount of modified graphene oxide added.

The present application belongs to the field of advanced coating and preparation, and particularly relates to a high-transparent and scratch-resistant multifunctional antistatic coating and a preparation method thereof. The present application provides a high-transparent and scratch-resistant antistatic coating, raw materials of the antistatic coating comprising fluorion-containing silsesquioxane monomer, functional monomer and catalyst; wherein the functional monomer is a crosslinking agent or an anti-crystallization agent. The coating obtained by the present application has a light transmittance of >98% (550 nm); a surface pencil hardness of greater than 9H, no scratches after more than 1000 times of steel wool rubbing; a surface resistivity of about 10 8 ~10 9 Ω / sq, and a fast electrostatic discharge rate.

The invention discloses a method for constructing an aluminum oxide and boron nitride fiber skeleton aerogel material based on a super-concentrated emulsion, which comprises the following steps: 1, mixing boron source micromolecules, nitrogen source micromolecules and a solvent, performing low-temperature treatment to obtain a boron nitride precursor, and performing freeze drying and high-temperature pyrolysis to obtain boron nitride aerogel; 2, dispersing alumina fibers into a polyethyleneimine aqueous solution to obtain modified alumina fibers, and dispersing the modified alumina fibers and boron nitride aerogel into a polyvinyl alcohol aqueous solution to obtain a super-concentrated emulsion; and 3, carrying out freeze drying and high-temperature pyrolysis on the ultra-concentrated emulsion. Through an ultra-concentrated emulsion template method, the boron nitride aerogel and the modified alumina fiber are subjected to wet chemical supramolecular assembly, construction and weaving of a micro-nano-scale three-dimensional framework are carried out, mutual interpenetration and winding are carried out to form a composite three-dimensional porous network structure, and the composite three-dimensional porous network structure has excellent flexibility, robustness, ultra-low temperature resistance and ultra-high temperature resistance; the material is suitable for the fields of new energy battery module thermal insulation materials, nuclear industry and aerospace.

This invention discloses a method for preparing and applying an antibacterial composite coating based on quaternized zinc oxide nanoparticles. The preparation method includes: grafting quaternary ammonium salt compounds onto the surface of zinc oxide nanoparticles to prepare synergistic antibacterial nanoparticles; modifying the substrate surface by co-deposition of dopamine and polyethyleneimine to introduce active functional groups; and spraying or dipping the quaternized zinc oxide nanoparticles onto the modified substrate surface to obtain the antibacterial composite coating. This novel antibacterial material preparation scheme can integrate the advantages of zinc oxide nanoparticles and quaternary ammonium salts, while solving key technical problems such as nanoparticle aggregation, weak interfacial bonding, and limited antibacterial efficiency. It is of great significance for promoting the upgrading of hygiene and safety in the fields of medicine, food, and building materials.

The application discloses a 3D-printable all-inorganic perovskite flexible light-emitting gel and a preparation method and application thereof, and relates to the technical field of perovskite. The method comprises the following steps: dissolving cesium bromide in water to obtain a cesium bromide aqueous solution; adding photo-curing precursor components into the cesium bromide aqueous solution in a certain proportion, and stirring uniformly to obtain a photo-curing precursor mixed solution; obtaining a photo-curing composite hydrogel; obtaining a flexible high polymer gel containing cesium bromide; and performing a spontaneous crystallization reaction, and then performing heat treatment on the gel to remove residual solvents. The perovskite precursors with large solubility difference are introduced into the photo-curing base material in two steps, respectively, so that the compatibility problem of the perovskite and the flexible base material precursor is solved.

The invention discloses an injectable tissue adhesive and application thereof, and belongs to the technical field of tissue adhesives. The tissue adhesive is mainly formed by compounding a hydrophilic polymer and a block polymer, wherein the hydrophilic polymer is selected from at least one of polyethylene glycol, polyvinyl alcohol, gelatin, hyaluronic acid, alginic acid and chitosan; the block polymer is poloxamer; the hydrophilic polymer is composed of more than two types of hydrophilic polymers with molecular weights, the poloxamer is composed of more than two types of poloxamers, the hydrophilic polymer and the block polymer are covalently connected through a cross-linking group, and the adhesion time of tissues is remarkably prolonged through matched use of the hydrophilic polymer and the block polymer. The tissue adhesive disclosed by the invention has excellent adhesion performance, and can be used as a wound sealing dressing, a tissue anti-adhesion material and an implanted instrument coating in the field of biomedicine.

This invention discloses a self-healing elastomer, belonging to the field of new materials technology. The invention utilizes a one-pot method to prepare the elastomer using hydroxyl-terminated prepolymers, isocyanates, chain extenders, metal ions, and crosslinking agents. The elastomer contains a rich multi-dynamic network of H bonds, metal coordination bonds, and disulfide bonds, resulting in a self-healing elastomer. This invention reduces the difficulty of preparation and improves the excellent properties of polyurethane elastomers, such as heat resistance and solvent resistance, through crosslinking. Simultaneously, it can achieve rapid self-healing at a low temperature of -10℃ and exhibits good mechanical properties.

The invention relates to the technical field of rock-like materials, and discloses a ceramsite-gypsum solid waste system rock-like similar material as well as a preparation method and application thereof, and the ceramsite-gypsum solid waste system rock-like similar material is prepared from desulfurized gypsum, water-absorbing ceramsite, a retarder and water; the mass ratio of the desulfurized gypsum to the water-absorbing ceramsite to the retarder is (200-400): (5-50): (0.5-0.9); the mass ratio of the water to the desulfurized gypsum is (0.43-0.47): 1; the water-absorbing ceramsite is obtained by soaking ceramsite with water. By limiting the mass ratio of the water to the desulfurized gypsum and the mass ratio of the desulfurized gypsum to the water-absorbing ceramsite, the low-strength and high-brittleness material with the simulation strength not exceeding 3 MPa and the brittleness index of 0.15-0.23 is obtained, the brittle failure characteristic is shown, the requirement for the low-strength and high-brittleness similar material is met, and the low-strength and high-brittleness material can be widely applied to the field of building materials. The problems that a hard rock similar model test material prepared in the prior art is high in strength and low in brittleness index are effectively solved.

The invention provides a quercetin-based polyurethane material, a novel metal-ligand coordination cross-linked polyurethane material and a preparation method and application of the quercetin-based polyurethane material and belongs to the technical field of polyurethane materials, and the structural formula of the novel metal-ligand coordination cross-linked polyurethane material is shown in the specification. The preparation method comprises the following steps: adding diisocyanate into a completely molten dihydric alcohol oligomer system, and reacting to obtain an isocyanate-terminated prepolymer; adding a quercetin solution into the prepolymer system, and reacting to obtain a quercetin-based polyurethane solution; and adding a metal ion solution into the quercetin-based polyurethane solution system, and volatilizing the solvent after the reaction to obtain the novel metal-ligand coordination cross-linked polyurethane material. According to the invention, oligomer dihydric alcohol is taken as a soft segment, quercetin is taken as a chain extender, and a polyurethane material containing quercetin in a main chain and a metal-ligand coordinated cross-linked polyurethane material are synthesized by a one-pot method; wherein the metal ions are used as cross-linking points to be connected with a polyurethane main chain, so that a more flexible network structure is formed.

The invention relates to a two-component liquid crystal polymer resin material and a preparation method thereof, and belongs to the technical field of intelligent polymer materials. The obtained liquid crystal polymer resin has the characteristics of simple preparation steps and rapid reaction, and a liquid crystal elastomer sample can be prepared only by mixing two components for reaction and then stretching and illuminating without removing a solvent. And the whole process only needs several hours at the fastest speed, so that the production efficiency is greatly improved. The two-component liquid crystal polymer resin material comprises a component A and a component B, the component A is a liquid crystal oligomer which is prepared by reacting a diacrylate-terminated liquid crystal monomer, a dithiol chain extender and a catalyst; the component B comprises a dithiol chain extender, a cross-linking agent, a catalyst and a photoinitiator.

The invention relates to a corrosion-resistant magnetically soft alloy, in particular to a high-chromium high-plasticity corrosion-resistant magnetically soft alloy and a preparation method of a bar of the high-chromium high-plasticity corrosion-resistant magnetically soft alloy. Comprising the following steps: proportioning: weighing 2.2-2.8% by weight of silicon and 0.3-0.6% by weight of manganese as alloying raw materials; the method comprises the following steps: weighing 0.005 to 0.008 percent of carbon and 0.8 to 1.2 percent of aluminum as a deoxidizing and desulfurizing agent; 19.0-21.0% of chromium and the balance iron are weighed to serve as smelting raw materials; and vacuum melting, molten steel deoxidation, desulfurization and alloying, primary forging, secondary forging and heat treatment are conducted, and the high-chromium high-plasticity corrosion-resistant magnetically soft alloy bar is manufactured after heat treatment is completed. By increasing the content of chromium in the corrosion-resistant magnetically soft alloy and introducing the aluminum element, the corrosion resistance, plasticity, resistivity and magnetic performance of the corrosion-resistant magnetically soft alloy are improved.

The present invention provides a modified polypropylene foam material and a preparation method thereof. The modified polypropylene resin composition comprises the following raw materials: polypropylene, terminal hydroxyl polybutadiene, a curing agent, a crosslinking modifier, a foaming agent, a lubricant, and an antioxidant; wherein the curing agent is a polyisocyanate curing agent; and the crosslinking modifier is a multi-arm star polymer crosslinking modifier. The modified polypropylene resin composition of the present invention has a significantly improved temperature resistance while improving the hardness of the material, has excellent thermal stability, and has broad application prospects.

The invention discloses a large-area surface multistage complex microstructure composite forming device which comprises an electric field auxiliary micro-rolling forming mechanism and an electric field auxiliary micro-die forming mechanism, the electric field auxiliary micro-rolling forming mechanism comprises a pulse power source, a feeding mechanism, a roughing roller, a finishing roller and a discharging mechanism, and the feeding mechanism, the roughing roller, the finishing roller and the discharging mechanism are sequentially arranged in the conveying direction. The electric field assisted micro die forming mechanism comprises a die pressing mechanism and pressure equipment located above the die pressing mechanism, the die pressing mechanism comprises a male die and a blank groove formed below the male die, and a plurality of microstructures are formed in the bottom end of the male die. According to the forming device, the rough roller, the finish roller and the pulse power source are arranged on the electric field auxiliary micro-rolling forming mechanism, the surface of a material is subjected to rolling forming twice under the heating condition, a basic structure is obtained, then the material is subjected to multi-stage complex microstructure forming through the male die, and the material is subjected to multi-stage complex microstructure forming. The method is suitable for the technical field of machining and plastic micro-forming.

The invention discloses a wide-temperature-range self-healing SiC fiber reinforced multiphase matrix composite material and a preparation method thereof, and particularly relates to the field of SiC composite materials. Comprising a SiC fiber preform, a BN interface phase, a first SiC matrix and an alternating matrix are sequentially deposited on the SiC fiber preform, the alternating matrix is coated with a SiAlBCN matrix, and the alternating matrix comprises a B4C matrix, a BN matrix and a second SiC matrix which are sequentially deposited. The preparation method comprises the following steps: firstly depositing a BN interface phase and a first SiC matrix in a SiC fiber preform, then circularly depositing a B4C matrix, a BN matrix and a second SiC matrix, and finally dipping and cracking the composite material obtained by deposition to obtain the SiC fiber reinforced multiphase matrix composite material. And good oxidation resistance can be achieved within the wide temperature range of 900-1500 DEG C.

The invention relates to an integrated tower type circulating flow reactor with a separation function, which is applied to mass and heat transfer processes among gas, liquid and solid phases in fine chemical engineering, drug intermediates and the like, the upper part of the reactor is of a three-stage circulating flow structure, and an outer sleeve (7) of each stage is divided into an inner ascending circulating area and an outer descending circulating area by an inner net (5); the inner sleeve (5) is connected with the outer sleeve (7) through a bolt (6); a breather pipe (1), a gas distributor (2), a liquid collector (3), a solid collector (4), an inner sleeve (5), a bolt (6) and a gas outlet pipe (8) are sequentially arranged on the tower body from bottom to top; the interface and the external pipeline are sequentially a gas inlet gas supplementing pipe (a), a gas circulating pipe (c), a liquid discharging pipe (e), a liquid inlet pipe (d), a solid feeding pipe (f) and an exhaust pipe (b) from bottom to top; the liquid collector (3) is positioned in the middle of the equipment and between the liquid inlet pipe (d) and the liquid discharge pipe (e); the gas supplementing pipe (a) is connected with the gas circulating pipe (c) through the drainage ejector (9), and circulating gas is drained through supplementing gas. The integrated circulating flow reactor with the separation function is applied to the processes of fine chemical engineering, drug intermediate production and the like, integration of vapor-liquid-solid circulating fluidization and separation is achieved, the design and manufacturing cost is reduced, and the gas utilization rate is increased; and the problems of high energy consumption and many dead zones of the original stirred tank reactor are solved, and the heat and mass transfer efficiency is improved.

The application discloses a preparation method of a self-reinforced and self-repairing polyurethane film suitable for an ocean extreme environment, and the preparation steps are as follows: reacting diisocyanate, high-molecular dihydric alcohol, 1,1'-ferrocene dimethyl alcohol, dibutyl tin dilaurate and a small-molecule chain extender to prepare a polyurethane with a force response function; reacting diisocyanate, high-molecular dihydric alcohol, a chain extender containing a carboxyl group or a catechol group and a small-molecule chain extender to prepare a polyurethane with a metal ion coordination function; and blending the polyurethane with the force response function and the polyurethane with the metal ion coordination function at a mass ratio of 1:1 to 1:2 to prepare the self-reinforced and self-repairing polyurethane film suitable for the ocean extreme environment. The mechanical properties and the self-repairing properties of the polyurethane film can be regulated by adjusting the amount of the chain extender containing the carboxyl group or the catechol group, and the mechanical properties of the polyurethane film prepared by the application can be improved in a self-crosslinking reaction process caused by repeated mechanical force.

The application discloses a kind of tri-block polyester materials and its synthesis method and application.The application belongs to the field of block polyester materials and synthesis.The application is to solve the technical problem that random transesterification leads to random sequence.The application utilizes the difference between different polymers in transesterification capacity, and synthesizes tri-block copolymer by sequential transesterification reaction, realizes the recycling of waste polyester materials, reduces plastic pollution caused by large use of polyester materials to a certain extent, realizes the recycling of plastic, and provides a method for synthesizing new materials.The application is suitable for recycling of polyester products.The obtained tri-block copolymer can be used as thermoplastic elastomer after chain extension.

The present application relates to a kind of for polytetrafluoroethylene cable wrapping tape oil, polytetrafluoroethylene cable wrapping tape and its preparation method.The oil is multi-component oil, including oil A, oil B and oil C;The oil A is C5~C6 hydrocarbon, and the distillation range is 30~80 ℃;The oil B is C7~C9 hydrocarbon, and the distillation range is 100~150 ℃;The oil C is mainly C 10 ~C 12 Hydrocarbon, and the distillation range is 160~200 ℃.The oil for polytetrafluoroethylene cable wrapping tape provided by the present application contains three kinds of oil A, B and C with different distillation range, so that the solvent system has a wide boiling range, and different components of the oil can be removed in stages during the preparation of polytetrafluoroethylene cable wrapping tape, ensuring the smooth progress of subsequent stretching and molding, and the obtained polytetrafluoroethylene cable wrapping tape is uniform, easy to sinter, and has good mechanical properties.