123results about How to "Improve brittleness" patented technology

The invention relates to a high-strength complex-phase hot-rolled wire rod for a 2100MPa bridge cable and a manufacturing method of the high-strength complex-phase hot-rolled wire rod, and the manufacturing method comprises the following steps: rolling and spinning C-Si-Mn-Cr-Mo chemical components into a wire rod, and carrying out online molten salt tail end quenching isothermal treatment, so that the wire rod firstly passes through front-section molten salt and is cooled at a cooling speed of more than or equal to 35 DEG C / s to enter a sorbite phase region from an austenite state; the method comprises the following steps of: controlling part of austenite to be converted into sorbite, cooling to a bainite phase through rear-section molten salt, carrying out end quenching, controlling bainite phase change, carrying out isothermal tempering to remove stress, and finally carrying out roller way slow cooling to prepare a complex-phase structure comprising tempered sorbite and tempered bainite, so that abnormal structures of network carbides and martensite can be effectively controlled; the high-strength composite phase structure control and plasticity matching are achieved, the tensile strength is 1530-1560 MPa, the percentage reduction of area is 30%-35%, and the method is suitable for manufacturing 2100 MPa-grade ultrahigh-strength bridge cables with large drawing amount and beneficial to reducing the risk of wire breakage.

The invention relates to the technical field of epoxy resin composite materials, in particular to an epoxy resin-based composite material and a preparation method thereof. The epoxy resin-based composite material comprises modified carbon fibers and an epoxy resin base material impregnated on a modified carbon fiber matrix, and the epoxy resin base material comprises the following raw materials in parts by weight: 80-100 parts of epoxy resin, 4-18 parts of a toughening elastomer, 24-45 parts of a curing agent and 1-3 parts of an accelerant. The carbon fibers are subjected to surface grafting hyperbranched molecular modification, so that the interface action between the modified carbon fibers and an epoxy resin matrix can be remarkably enhanced, and meanwhile, the high strength and high temperature-resistant stability of the carbon fibers are utilized, so that the epoxy resin-based composite material has good toughening, reinforcing and temperature resistance improving effects.

The invention relates to the technical field of epoxy resin coatings, and discloses an inorganic composite nano anticorrosive coating material and a preparation method thereof. The inorganic composite nano anticorrosive coating material comprises a component A, a component B and a component C, wherein the component C is obtained by mixing a functional modified inorganic composite nano material and aluminum sorbate; the component A is obtained by mixing modified epoxy resin, a defoaming agent and an anti-settling agent, and the component B comprises a polyamide curing agent. The inorganic composite nano anticorrosive coating material disclosed by the invention has excellent toughness, wear resistance, corrosion resistance, antibacterial and antifouling properties and ultraviolet resistance.

The invention relates to the field of flame retardants, and provides a sepiolite-based flame retardant and a preparation method thereof, the sepiolite-based flame retardant comprises the following raw materials by weight: 30-50 parts of antimony trioxide, 10-20 parts of modified sepiolite, 4-10 parts of a heat stabilizer, 10-20 parts of methyl silicone oil, and 0.5-4 parts of a dispersant. The sepiolite-based flame retardant provided by the invention has good flame retardance and smoke suppression performance, and has better commercial application value.

The invention belongs to the technical field of building materials, and particularly relates to magnesium oxychloride cement mortar containing polyaluminum chloride water purifier waste residues as well as a preparation method and application of the magnesium oxychloride cement mortar. The magnesium oxychloride cement mortar containing the polyaluminum chloride water purifying agent waste residues is prepared from the following components in parts by mass: 45 to 55 parts of magnesium oxychloride cement and gypsum, 100 to 150 parts of the polyaluminum chloride water purifying agent waste residues, 0 to 3.6 parts of citric acid, 0 to 14 parts of styrene-acrylic emulsion, 130 to 170 parts of river sand and 160 to 200 parts of water, the magnesium oxychloride cement is prepared from 480 to 520 parts of magnesium oxide and 190 to 320 parts of magnesium chloride hexahydrate. The magnesium oxychloride cement mortar containing the polyaluminum chloride water purifying agent waste residues can be used as a cement-based pavement patching material, a large amount of polyaluminum chloride water purifying agent waste residues can be consumed, the problem of environmental pollution caused by the waste residues is effectively solved, the water resistance of the magnesium oxychloride cement mortar can be effectively improved, and efficient resource utilization of industrial solid waste is achieved.

The embodiment of the invention relates to a zein / polyoxyethylene / dihydroquercetin nanofiber preservative film as well as a preparation method and application thereof, and belongs to the technical field of bio-based polymer composite materials. The preparation method of the zein / polyoxyethylene / dihydroquercetin nano-fiber preservative film comprises the following steps: dissolving zein in an acetic acid solution, then adding polyoxyethylene to obtain a zein / polyoxyethylene blended solution, and adding the zein / polyoxyethylene blended solution into the acetic acid solution to obtain the zein / polyoxyethylene / dihydroquercetin nano-fiber preservative film. Adding dihydroquercetin into the zein / polyoxyethylene blended solution, and uniformly mixing to obtain a spinning solution; the spinning solution is subjected to solution blowing and pressing spinning process treatment. The nanofiber preservative film provided by the embodiment of the invention has good hydrophobicity and oxidation resistance, and also has the advantages of good flexibility, hydrophobicity, oxidation resistance, antibacterial activity, biocompatibility, environmental protection, degradability and the like.

The invention relates to the technical field of nylon materials, and discloses a low-moisture-absorption nylon composite material and a preparation method thereof. The nylon composite material prepared by the invention is prepared from the following raw materials in parts by weight: 40-50 parts of nylon 66, 35-55 parts of modified nylon 6, 25-35 parts of reinforcing filler, 0.5-2 parts of a lubricant and 0.5-1 part of an antioxidant, the nylon 66 / modified nylon composite material is prepared by taking nylon 66 and modified nylon 6 as substrate materials, adding auxiliaries such as reinforcing filler, mixing, extruding and granulating, the modified nylon 6 is introduced, so that the toughness of the composite material is improved, and the water absorption rate is reduced; due to the introduction of the reinforcing filler, the synergistic effect of halloysite and boron nitride can be utilized, the flame retardant property of the composite material is improved, and the water absorption rate is further reduced.

The invention provides an aluminum-vanadium-niobium-chromium intermediate alloy as well as a preparation method and application thereof. The aluminum-vanadium-niobium-chromium intermediate alloy comprises the following components in percentage by mass: 15%-22% of V, 1%-7% of Nb, 5%-11% of Cr and the balance of Al and inevitable impurities. The preparation method of the aluminum-vanadium-niobium-chromium intermediate alloy comprises the following steps: firstly, respectively preparing three binary intermediate alloys, namely primary alloys, by utilizing an aluminothermic reduction method; then, the primary alloy is refined through vacuum induction melting, and a secondary alloy is obtained; and finally, the secondary alloy and metal aluminum are subjected to vacuum induction melting, and the aluminum-vanadium-niobium-chromium intermediate alloy is prepared. The aluminum-vanadium-niobium-chromium intermediate alloy has the advantages of being uniform in component, low in element segregation and low in impurity content, and has very good application prospects and large-scale industrial popularization potential in the field of titanium alloy production through the additive manufacturing technology.

The invention discloses a liquid nitrogen freezing and carbon dioxide blasting combined anti-reflection device and method. The device comprises a freezing pipe and an anti-reflection assembly. The anti-reflection assembly is mounted on the inner side of the freezing pipe; the anti-reflection assembly comprises a flexible air bag, an excitation device and a sealing positioning ring; the sealing positioning ring sleeves the outer side of the flexible air bag, and the flexible air bag is provided with an extension section; an end socket is mounted outside the sealing positioning ring in a sleeving manner, and the sealing positioning ring fixes the extension section on the end socket; the exterior of the end head is fixedly connected with the freezing pipe; the excitation device is arranged in the flexible air bag; and a firing line is mounted on the excitation device. The mechanical property of the coal body is optimized and improved through liquid nitrogen freezing, so that the mechanical strength of the coal body is enhanced, the brittleness is greatly improved, and then CO2 phase change blasting is performed to crack the coal seam; for a low-permeability soft coal seam, hole collapse caused by soft coal in single blasting is avoided, more cracks can be generated in the coal seam after CO2 blasting, the fracturing and permeability increasing effects are greatly improved, and a good promoting effect is achieved on gas extraction.

The invention discloses a method for preparing a silk fibroin-based electrostatic spinning composite nanofiber membrane, comprising the following steps: S1, obtaining silk fibroin; S2, preparing a spinning solution with a silk fibroin and a modifier; the modifier is one or more of carvacrol, chitosan or chitosan quaternary ammonium salt; S3, preparing a nanofiber membrane by electrostatic spinning. The nanofiber membrane has a high antibacterial rate, high water permeability, good biocompatibility, excellent food preservation performance and excellent biodegradability.

The invention discloses furfuryl alcohol / acrylamide composite modified wood and a preparation method thereof, and belongs to the field of modified wood. The invention aims to solve the problems that the toughness is reduced and the dimensional stability is relatively low after wood is modified by furfuryl alcohol at present. The furfuryl alcohol / acrylamide composite modified wood is obtained after wood is modified by utilizing a furfuryl alcohol / acrylamide modifier; the furfuryl alcohol / acrylamide modifier is prepared from furfuryl alcohol, maleic anhydride, borax, acrylamide and a solvent. The method comprises the following steps: 1, weighing; 2, preparing a furfuryl alcohol oligomer; 3, uniformly mixing the furfuryl alcohol oligomer with the weighed acrylamide; fourthly, the wood is soaked in a furfuryl alcohol / acrylamide modifier, and then vacuum and pressurization treatment is conducted; and 5, heating, curing and drying. The invention is used for furfuryl alcohol / acrylamide composite modified wood and preparation thereof.

The invention relates to the technical field of epoxy adhesives, in particular to a room-temperature-curing high-temperature-resistant heat-conducting epoxy adhesive and a preparation method thereof. Comprising a component A and a component B. The component A comprises, by weight, 60-135 parts of epoxy resin, 10-30 parts of a flexibilizer, 30-85 parts of a filler and 2-15 parts of an auxiliary agent, and the component B comprises, by weight, 40-90 parts of an amine curing agent, 10-30 parts of high-temperature-resistant resin, 30-60 parts of a filler and 2-12 parts of an additive. The epoxy resin comprises bisphenol A epoxy resin, novolac epoxy resin, polyurethane modified resin and multifunctional epoxy resin. The product has good mechanical properties and excellent temperature resistance, and the toughening agent and the resin powder are reasonably matched to ensure that the product has excellent impact resistance and temperature resistance. A plurality of amine curing agents are reasonably matched, so that the product can be cured at room temperature and used at high temperature, and meanwhile, the temperature resistance of the product is further improved by adding the high-temperature-resistant resin.

The invention discloses a polyether-ether-ketone-inorganic hybrid modified water-based fluorocarbon floor coating with long and super weather resistance and a preparation method of the polyether-ether-ketone-inorganic hybrid modified water-based fluorocarbon floor coating, and belongs to the field of coatings. The coating comprises a component A and a component B, wherein the component A comprises a water-based fluorocarbon modified polyhydroxy acrylic emulsion, a polyether-ether-ketone modified inorganic silicate aqueous dispersion, yttria-stabilized zirconia composite aluminum oxide mixed slurry and other auxiliaries. And the component B comprises an HDI hydrophilic organic silicon modified polyisocyanate curing agent, an HDI hydrophobic isocyanate curing agent and the like. According to the invention, the high inertia and mechanical properties of the organic high polymer can be highlighted, and the adhesiveness of the organic high polymer to a lower coating film is further improved.

The invention belongs to the technical field of epoxy resin, and particularly relates to a hyperbranched polysiloxane flexibilizer, a preparation method thereof and application of the hyperbranched polysiloxane flexibilizer in preparation of an epoxy resin matrix of a glass fiber reinforced plastic pipeline. The preparation method comprises the following steps: carrying out addition reaction on hydroxyl-terminated polyether modified silicone oil and toluene diisocynate to prepare an intermediate, and then reacting with a chain extender diethanol amine to obtain the hyperbranched polysiloxane toughening agent containing amino groups. The flexibilizer provided by the invention is of a hyperbranched three-dimensional structure, molecules have Si-O-Si flexible chain segments, and molecular chains contain amino groups, so that the flexibilizer has excellent compatibility with epoxy resin, can effectively improve the brittleness of an epoxy resin cross-linked network and improve the impact resistance of the resin, and has small influence on the tensile strength and heat resistance of the resin. The epoxy resin containing the toughening agent can be used for manufacturing the glass fiber reinforced plastic pipeline for an oil field, and the toughness of the existing glass fiber reinforced plastic pipeline is effectively improved.

The invention discloses a high-adhesion overweight anticorrosive paint technology, the overweight anticorrosive paint is composed of a component A and a component B. The component A comprises the following raw materials by weight: 40-60 parts of epoxy resin, 5-10 parts of modified polyarylene ether nitrile, 1-15 parts of a diluent, 1-10 parts of a functional filler, 1-15 parts of a pigment, and 0.1-3 parts of an auxiliary agent; the component B comprises the following raw materials in parts by weight: 5-25 parts of a polyamide epoxy curing agent, 5-25 parts of a phenolic aldehyde amine epoxy curing agent and 0.1-3 parts of an accelerant. Through reasonable combination of special molecular structure design and functional filler, a compact, dry and stable protective layer can be formed, and the adhesive force between the coating and a base material is remarkably improved, so that long-term effective protection is provided for a metal structure.

The invention is suitable for the technical field of 3D printing, and particularly relates to a method for producing a CF-PPS wire rod with high heat resistance and high dimensional stability, and the method comprises the following steps: carrying out surface modification treatment on carbon fibers to obtain pretreated carbon fibers; the preparation method comprises the following steps: uniformly mixing polyphenylene sulfide, a glycidyl methacrylate grafted modified ethylene-octylene copolymer flexibilizer and glass beads, and putting the mixture into mixing equipment; putting the pretreated carbon fibers into the mixing equipment; feeding plastic is regulated and controlled to control the content of the carbon fibers, extrusion molding is carried out, granulation treatment is carried out, and the carbon fiber reinforced polyphenylene sulfide composite granules are obtained; and extruding and drawing the carbon fiber reinforced polyphenylene sulfide composite granules by a single screw to obtain the CF-PPS wire. The brittleness of polyphenylene sulfide can be improved, the interlayer bonding force of a printed piece can be improved, the prepared wire rod has the characteristics of being tough and not prone to brittle fracture, and the printed piece is low in shrinkage rate, not prone to warping and good in interlayer bonding performance.

This invention relates to the field of polymer material synthesis technology, specifically to a modified PVB resin and its preparation method. The invention introduces a fluorinated acetal monoaldehyde derivative containing fluorine into the PVB resin. This derivative is mixed with n-butyraldehyde and glyoxal, thereby undergoing an acetalization reaction with the 1,3-o-diol structure of the PVB molecular chain, incorporating the fluorinated side link into the PVB molecular chain. Utilizing the high electronegativity and high C-F bond energy of fluorine atoms, it shields against the intrusion of external corrosive media, inhibits oxidative yellowing, and improves weather resistance. Furthermore, the invention introduces glyoxal as a crosslinking agent, containing dialdehyde groups, which can react between adjacent polyvinyl alcohol segments, causing slight crosslinking between the originally linear PVB resin segments, improving the resin's shielding performance, further reducing the intrusion of external corrosive media, and enhancing the stability of the PVB resin.

The invention discloses a toughened waterproof gypsum composition and a preparation method thereof. The toughened waterproof gypsum composition comprises the following components in parts by weight: 80-250 parts of gypsum powder, 54-150 parts of heavy calcium carbonate powder, 60-95 parts of talcum powder, 75-175 parts of light calcium carbonate powder, 80-105 parts of ash calcium powder, 15-55 parts of melamine powder, 25-65 parts of cellulose, 35-85 parts of a retarder, 70-95 parts of a water repellent and 70-95 parts of a toughening agent. A proper amount of a water repellent and a flexibilizer are added in the preparation of the gypsum composition, the water repellent is organic silicon hydrophobic powder, and the organic silicon hydrophobic powder is ternary fine particles and is composed of a powder carrier, a colloid coating material and an organic silicon active component easy to disperse. The colloid wrapping material can stably preserve the active components in the powder and can be timely released after water is added, the dispersity of the organic silicon hydrophobic powder in water is good, and the hydrophobic performance of the material can be improved; and the flexibilizer is used for improving the brittleness of the gypsum and improving the impact resistance of the gypsum.

The present application relates to a kind of environment-friendly water-based phenolic resin anticorrosive coating and its preparation process, belong to the field of coating technology.The coating is made of water-based phenolic resin emulsion, hyaluronic acid-lysine composition load nano SiO2-ZnO composite filler, synergistic anticorrosive filler, wetting dispersant, film forming aid, leveling thickener, defoaming agent and deionized water.The superhydrophilic of hyaluronic acid fundamentally solves the dispersion and storage stability problem of phenolic resin in aqueous phase, and the amino group of its lysine side chain can also chemically bond with resin during curing, significantly enhancing the adhesion, flexibility and interfacial bonding strength of coating.At the same time, nano SiO2, ZnO and synergistic anticorrosive filler construct a multiple synergistic anticorrosive network of physical shielding, sacrificial anode and chemical passivation, achieving long-term active protection.The whole system uses water as medium, selects bio-based raw materials and low VOC additives, and the environmental protection is outstanding.

The invention belongs to the technical field of refractory materials, and particularly relates to a high-thermal-conductivity refractory castable and a preparation method thereof. The high-thermal-conductivity refractory castable comprises the following components in parts by weight: 50-60 parts of silicon carbide; 10 to 15 parts of white corundum; 5-8 parts of pure calcium aluminate cement; 3-5 parts of modified graphite fiber; 2-3 parts of silica powder; 1-2 parts of a binding agent; 0.3 to 0.5 part of a water reducing agent; the high-thermal-conductivity refractory castable prepared by the invention has good thermal conductivity, mechanical properties and high-temperature dimensional stability, and is suitable for filling and repairing high-thermal-conductivity parts.

The invention discloses a sulfur-free FR-4 copper-clad plate and a preparation method thereof, and belongs to the technical field of copper-clad plates. The copper-clad plate is prepared from sulfur-free epoxy resin, a sulfur-free curing agent, a sulfur-free flame retardant, organic silicon hybrid macromolecules, tetrafunctional epoxy resin, linear phenolic resin, microencapsulated ammonium polyphosphate, melamine cyanurate, surface grafting modified boehmite nanorods and filler. Through the design of a sulfur-free system, the sulfur content of the product is lower than 50 ppm, and the problems of contact resistance increase, unstable signal transmission and the like caused by sulfide migration of a traditional FR-4 copper-clad plate in a high-temperature and high-humidity environment are thoroughly solved. Meanwhile, the organic silicon hybrid macromolecules and the high-functionality epoxy resin have a synergistic effect, so that the balance of high glass transition temperature and high toughness is realized. The copper-clad plate has excellent dielectric property, flame retardant property and long-term reliability, and meets the development requirements of high reliability and high performance of electronic products.

The utility model discloses an adjustable cutting device for polyethylene particle production, and relates to the field of polyethylene particle production, the adjustable cutting device comprises a working table top, one side of the top of the working table top is provided with a feed opening, four legs of the bottom of the working table top are fixedly provided with supporting table legs, the bottoms of the supporting table legs are provided with positioning suckers, and the positioning suckers are fixedly arranged on the working table top. Auxiliary supporting legs are mounted below the four edges of the supporting table legs; a cutting mechanism is arranged on one side of the top of the working table, polyethylene is cut into particles through the cutting mechanism, and meanwhile the sizes of polyethylene particles can be adjusted through the cutting mechanism; a cooling mechanism is arranged on the other side of the top of the working table top, the cooling mechanism cools polyethylene, the polyethylene is cut by designing the cutting mechanism, the polyethylene is uniformly cut into particles with small specification difference, the uniformity and quality of the size of the cut particles are ensured, and meanwhile, the size of the particles is changed by adjusting the position of an adjusting plate.

The invention relates to the technical field of neodymium-iron-boron magnetic steel, in particular to high-strength neodymium-iron-boron magnetic steel and a preparation method, according to the technical scheme, the high-strength neodymium-iron-boron magnetic steel is composed of RE-M-T-B rare earth compounds and comprises a main phase and a grain boundary phase, RE is selected from one or two or more of La, Ce, Ho, Gd, Pr, Nd, Dy and Tb; m is selected from one or two or more of Al, Cu, Zn, Sn, Ga, Nb, V, W, Ti, Ni, Zr and Mn; t is selected from one or two of Fe and Co; wherein RE is not less than 13.5% and not more than 15.5%, M is not less than 0.6% and not more than 1.2%, and B is not less than 5.5% and not more than 6.4%. According to the neodymium iron boron magnetic steel prepared by the method, the defects such as holes are reduced, the magnet is more compact, the grain boundary phase is well distributed, better toughness is achieved, and the strength and comprehensive performance of the neodymium iron boron magnetic steel are improved.

The invention discloses a continuous and high-repetition-frequency nanosecond pulse laser pore-forming method, which comprises the following steps of: focusing laser on the surface of a metal material in a low-pressure environment, and continuously adding high-repetition-frequency nanosecond pulse laser in a continuous laser irradiation process so as to increase the removal rate of the material. Compared with an existing continuous laser drilling technology, the continuous laser drilling method has higher machining efficiency, the area of a recast layer can be reduced by 50% or above, and the continuous laser drilling method can be used for machining thicker metal plates.

The present invention relates to the technical field of polymer composite materials, and specifically discloses a straw fiber modified wood plastic composite material. In the present invention, the straw fiber modified wood plastic composite material includes the following raw materials in parts by mass: 100 parts of polypropylene resin, 25-35 parts of flame retardant modified straw fiber, 3-5 parts of maleic anhydride grafted polypropylene, 12-20 parts of synergist, 1-3 parts of antibacterial agent, 1-1.5 parts of stabilizer and 1-3 parts of lubricant, wherein the flame retardant modified straw fiber is prepared from straw fiber powder, basalt fiber and organic flame retardant 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide, and the straw fiber renewable resources are recycled in the present invention, which improves its added value and has significant ecological and environmental benefits. Through chemical grafting, each raw material has good dispersibility and compatibility, and the obtained composite material exhibits excellent mechanical properties and flame retardant properties.

The invention relates to the field of polycarbonate films, in particular to an antibacterial polycarbonate film and a preparation process thereof. The invention discloses an antibacterial polycarbonate film, which is prepared from the following raw materials in parts by weight: 100 to 150 parts of isosorbide polycarbonate, 5 to 8 parts of cross-linking agents, 10 to 15 parts of sol type antibacterial agents, 1 to 3 parts of antioxidants and 2 to 4 parts of flatting agents. The chitosan type antibacterial agent is subjected to TiO2 sol treatment to obtain a sol type antibacterial agent. The antibacterial polycarbonate film prepared by the invention has high transparency, good mechanical property and excellent sterilization function through the combined action of isosorbide polycarbonate, the cross-linking agent, the sol-type antibacterial agent, the antioxidant and the flatting agent.

The object of the present invention is to provide a novel oil composition suitable for use in chocolate products that is substantially free of lauric acid. An oil composition satisfying the following (a) and (b): (a) The weight ratio (P2Po / P2M) of the content of a triglyceride (P2Po) bonded to two palmitic acids (P) and one palmitoleic acid (Po) relative to the content of a triglyceride (P2M) bonded to two palmitic acids (P) and one monounsaturated fatty acid (M) having 16 to 24 carbon atoms is 0.04 or more; (b) The content of a triglyceride (S3) bonded to three saturated fatty acids (S) having 16 to 24 carbon atoms is 1.5 to 13% by weight.

The invention relates to the technical field of coatings, in particular to an environment-friendly insulating coating for a sodium power battery and a preparation process of the environment-friendly insulating coating. The invention relates to an environment-friendly insulating coating for a sodium power battery. The environment-friendly insulating coating comprises the following components: modified epoxy acrylate resin, polyurethane resin, a free radical initiator, a cationic initiator, nano silicon dioxide, nano aluminum oxide, glass beads, a flatting agent, a defoaming agent, an anti-settling agent and a light stabilizer. The core-shell structure micro-nano rubber particles are used for modifying the epoxy acrylate resin, the flexibility and impact resistance of a cured coating are improved, the advantages of free radical curing and cation curing are combined, the shrinkage rate in the free radical curing process is reduced, the surface hardness of the coating is improved, dual-initiator systems are mutually balanced, and the curing performance of the coating is improved. According to the present invention, the rapid curing is achieved while the good mechanical property and the good adhesion are maintained, the formula is optimized, the matrix resin material, the filler and the auxiliary agent are selected, the solid component ratio is increased, the VOC emission is reduced, and the environmental protection is provided.

The invention provides a preparation method of polyurethane modified phenolic aerogel and the prepared polyurethane modified phenolic aerogel. The preparation method comprises the following steps: S1, preparing a polyurethane prepolymer terminated by a phenol ring; s2, mixing the phenol ring-terminated polyurethane prepolymer with phenolic resin to prepare a mixed solution, and adding a curing agent to carry out gel reaction to prepare polyurethane modified phenolic resin gel; s3, a liquid phase in the polyurethane modified phenolic resin gel is removed, and the polyurethane modified phenolic resin aerogel is obtained. According to the preparation method disclosed by the invention, a phenol ring is introduced into a polyurethane prepolymer as an end group to obtain a phenol ring-terminated polyurethane prepolymer, and then the phenol ring-terminated polyurethane prepolymer is mixed with phenolic resin to prepare the aerogel, so that the problem that polyurethane cannot be effectively introduced into a phenolic resin system is solved, and the preparation method has the characteristics of simple process, short period and suitability for industrial production; and the prepared aerogel has good mechanical properties.

The invention discloses a finely separated waste asphalt mixture fine material prefabricated building block and a preparation method thereof, and belongs to the technical field of road engineering.The preparation method comprises the following steps that an asphalt pavement recycled material is refined through refining equipment, and vibratory screening is performed to obtain an asphalt pavement recycled material fine material; detecting the mass of the aged asphalt in the fine asphalt pavement reclaimed material through a combustion method; placing the fine asphalt pavement recycled material in a drying oven for preheating and heat preservation, after preheating and heat preservation are finished, placing the fine asphalt pavement recycled material in a mixing pot for heating and mixing, and adding a regenerant according to the mass of the aged asphalt for continuous mixing, so as to obtain a regenerated asphalt mixture after preheating and heat preservation are finished; and loading the regenerated asphalt mixture into a mold, loading and molding to obtain the finely separated waste asphalt mixture fine material prefabricated building block. According to the invention, full utilization and high-value recovery of the fine aggregate of the recycled asphalt mixture can be realized.