48results about How to "Improve interfacial bond strength" patented technology

The invention provides an epoxy modified cement-based material, the epoxy modified cement-based material comprises an organic phase structure and inorganic crystals, and the inorganic crystals are radially distributed on the surface of the organic phase structure; the organic phase structure is a spherical or sphere-like structure with the diameter of 3-15 microns; the inorganic crystal is of a needle-shaped, rod-shaped or sheet-shaped structure with the length being 0.3-3 microns and the diameter being 0.05-0.5 microns. The epoxy modified cement-based material disclosed by the invention shows good adhesion and dispersion resistance under water or in a humid environment, can realize rapid underwater construction, and keeps stable performance for a long time under harsh conditions such as a marine environment and a humid environment; the engineering requirements of multiple fields such as building structure repairing, underwater repairing, rapid first-aid repair, ocean protection and road and bridge engineering are met, and the integration of high strength, high toughness, strong interface bonding and long-acting durability is realized.

The invention discloses a polypropylene film suitable for a film lamination method and a preparation method of the polypropylene film. The polypropylene film comprises the following components in parts by weight: 85.6-91.85 parts of polypropylene; 4-7 parts of long-chain branched polypropylene; 4-7 parts of a compatibilizer; 0.05 to 0.1 part of a nucleating agent; and 0.1 to 0.3 part of an antioxidant. Firstly, polypropylene is selected, so that the wettability of a melt to carbon fibers is effectively improved, and the filling defect caused by high viscosity of a traditional material is overcome; and secondly, the compatibilizer is introduced to form firm chemical bonding with the fiber surface, so that the interface bonding strength is greatly enhanced. And finally, by combining a precise extrusion and casting process, the prepared polypropylene film is uniform in thickness, excellent in interface performance and suitable for a film lamination method.

The application discloses a kind of optical cable surface modification method, modified optical cable and concrete monitoring system.The optical cable surface modification method includes the following steps: surface roughening treatment is carried out to the coating layer of optical cable, and surface roughened optical cable is obtained;Nanometer material dispersion liquid is coated to the surface of surface roughened optical cable, and modified optical cable is obtained after solidification treatment.The application constructs micro-nano rough structure on the surface of optical cable coating layer by the synergistic modification strategy of "surface roughening+nanometer material loading", and loads active nanometer material, so that modified optical cable can induce hydration product to be generated densely at interface after being buried in concrete, significantly improve interface bonding strength, reduce interface porosity and thermal resistance, so that high-precision sensing and long-term monitoring stability of stress, strain and temperature are realized.

The present application relates to the technical field of ceramic coating, especially to a micro-nano structure ceramic coating and its application on the reaction furnace of zircon sand boiling chlorination method, aiming at solving the problems of weak bonding force between the existing protective coating and the substrate, poor thermal shock resistance and easy failure in long-term high-temperature chlorine environment; the present application constructs a nano-wire reinforced micro-nano structure transition layer on the surface of porous corundum brick substrate in situ, and sequentially constructs a lanthanum phosphate bonding layer and a yttrium stabilized zirconium oxide barrier layer on the transition layer; the design utilizes the mechanical anchoring effect of micro-nano structure and the strong chemical bonding ability of lanthanum phosphate to realize the firm combination of the coating and the substrate; the dense characteristics of the zirconium oxide layer provide ultimate protection; the method significantly improves the overall anti-peeling ability and long-term corrosion resistance of the coating system.

The present application relates to the technical field of resin, in particular to a conductive polypropylene composite material and a preparation method thereof.In view of the problems of poor processing fluidity, easy shear damage of conductive network and deterioration of mechanical properties caused by high filling of conductive filler in the prior art, the present application realizes the low volume resistivity, high melt flow rate and excellent mechanical toughness by the solid phase pre-coating technology, and effectively balances the conductivity, processability and strength.

The invention relates to the technical field of preparation of concrete, in particular to LC3-basalt fiber regenerated block concrete and a preparation method thereof.The preparation method comprises the following preparation steps that S1, LC3 cement, regenerated blocks, natural sand and gravel are poured into a stirrer to be subjected to uniform dry mixing, and a dry mixture is obtained; s2, adding water, a modified water reducer and a performance modifier into the dry mixture, performing wet mixing, uniformly scattering modified basalt fibers during wet mixing, and performing uniform stirring to obtain a wet mixture; and S3, pouring the wet mixture into a test mold, standing at room temperature, demolding, and curing for 26-28 days to obtain the LC3-basalt fiber regenerated block concrete. Through the synergistic effect of the modified basalt fiber, the modified water reducer and the performance modifier, the compressive strength, the strength retention rate after high temperature and the tensile strength of the concrete are remarkably improved, and chemical activation and densification after the regenerated block is added are achieved.

This invention discloses a self-healing, anti-corrosion, and cooling coating and its preparation method. The preparation method includes: TiO2 surface activation treatment; in-situ construction of a mesoporous silica shell and loading of a corrosion inhibitor; surface silane modification; and coating and curing after blending the obtained filler with resin and curing agent. The coating consists of a polymer resin matrix and a multifunctional core-shell nanocomposite material uniformly dispersed therein; the composite material has a three-level structure of core-shell-interface layer: titanium dioxide as the core, mesoporous silica loaded with corrosion inhibitor as the functional shell, and a silane coupling agent as the interfacial compatibility layer. Through multi-level structural design, this invention enables a single filler to simultaneously achieve high solar reflectance, high infrared emission, and intelligent release of corrosion inhibitors. The coating combines a physical barrier, active corrosion prevention, and radiation cooling triple protection mechanism, and can be widely used for long-term protection of outdoor metal or non-metal substrates.

The invention relates to the technical field of composite electroplating, in particular to an electroplating method for preparing a high-wear-resistance self-lubricating plating layer, which comprises the following steps: firstly, carrying out pretreatment of oil removal and acid pickling activation on a metal workpiece; then preparing a nano composite nickel plating solution in which a nickel plating basic solution contains a nano particle composite phase subjected to pre-dispersion treatment, and the total concentration of composite particles is 10-60g / L; then the dispersion stability of the nano-composite nickel plating solution is maintained in a circulating filtration and mechanical stirring combined mode, and the pretreated workpiece is electroplated; and finally, after electroplating is completed, the workpiece is cleaned and dried. According to the electroplating process for preparing the nickel-based composite coating with high wear resistance and low friction coefficient, the pulse current is adopted, and the high instantaneous current density and turn-off time of the pulse current are utilized, so that desorption and rearrangement of adsorbed particles are facilitated, uniform embedding of the particles is promoted, nickel matrix crystal grains are refined, and the compactness and comprehensive mechanical properties of the coating are further optimized.

This invention relates to the field of brass material technology, specifically a high-strength, high-toughness brass material and its preparation method. A porous oxide film is pre-formed on the brass surface through plasma electrolytic oxidation. A double-bonded silver-loaded graphene oxide-doped oxide film is then constructed on the brass surface. A photocurable sealing coating is then prepared for sealing. In the photocurable sealing coating, double-bonded silver-loaded graphene oxide and modified MXene are introduced as fillers. MXene is first thiolated with 3-mercaptopropyltriethoxysilane, and then grafted with a double-bonded dibenzimidazole ring derivative via photo-clicking to obtain modified MXene. A vinyl-terminated polyurethane is used as a crosslinking agent, and a complex crosslinking network is constructed using a blend of o-phenylphenoxyethyl acrylate, butyl acrylate, glycidyl methacrylate, and octadecyl acrylate as acrylic monomers. A diluent and solvent are introduced to extend the service life of the brass material.

The invention relates to the technical field of building materials, and discloses artificial coarse aggregate and a preparation method thereof. The artificial coarse aggregate is prepared from the following raw materials in parts by weight: 100 parts of sea sand; 12 to 20 parts of a binder; 0.06 to 0.18 part of a coalescing agent; 12 to 20 parts of water; wherein the binder is an acrylate copolymer emulsion with the solid content of 50%, and the coalescing agent is propylene glycol monobutyl ether. The preparation method comprises the steps of raw material pretreatment and mixing, adhesive solution preparation, rolling agglomeration granulation, curing maintenance, screening and the like. By controlling the particle size grading of the sea sand, the use amount of the binder and process parameters, the prepared artificial coarse aggregate is in an irregular polygonal form, has a rough and porous surface, has proper bulk density, cylinder compressive strength and water absorption, and can meet the use requirements of C25-C35 grade lightweight concrete. According to the method, efficient utilization of sea sand resources is achieved, the process is simple, energy consumption is low, and the method has good engineering application prospects.

The invention discloses an efficient environment-friendly curing agent for marine soft soil and a preparation method and application thereof, and belongs to the technical field of soft soil curing. The salt-resistant concrete comprises the following components in percentage by mass: 55%-70% of a core gel system, 8%-15% of a composite excitation system, 5%-10% of a salt-resistant modification system and 10%-20% of a reinforced filling system, the core gelling system is composed of steel slag micro powder, slag powder and desulfurized gypsum; the composite excitation system is composed of modified fly ash and a composite alkali activator; the salt-resistant modification system is composed of a chitosan grafted acrylamide copolymer and zeolite powder; the reinforced filling system is composed of polypropylene fibers, nano calcium carbonate and construction waste regenerated micro powder. The curing agent is a special curing agent system for marine soft soil with strong adaptability, high curing efficiency, good durability and essential environmental protection.

This invention belongs to the field of inorganic cementitious materials technology, and discloses a magnesium oxysulfate gel modifier and its modified gel preparation method. The modified magnesium oxysulfate gel contains silica fume, organosilicon waterproofing powder, humic acid, functional additives, nanocomposite particles, sucrose, and ethylene glycol monobutyl ether. After modification, the mechanical strength of the magnesium oxysulfate gel is improved, and its fire resistance, environmental resistance, and antibacterial properties fully meet the standards, solving the pain points of traditional magnesium oxysulfate materials. It can be used in building components such as fireproof door core panels, firewalls, and fireproof partitions. Fireproof door panels made using the modified gel achieve a fire resistance limit of Class A, with improved interfacial bonding strength, excellent impact resistance and weather resistance, and are suitable for multiple scenarios. The entire process is free of VOCs exceeding the standard, and combustion produces no toxic gases, meeting green building material standards and contributing to the development of ultra-low energy consumption buildings. It is suitable for low-temperature and frigid regions, high-temperature industrial environments, high-humidity antibacterial scenarios, and projects with high environmental protection requirements. It constructs a four-dimensional innovation system of "nanoparticle micro-enhancement - functional additive environmental adaptation - traditional component performance optimization - door panel structure synergy", realizing integrated performance improvement of "materials - core panels - door panels".

The application discloses a high water pressure resistant, low temperature flexible waterproof and moisture permeable composite fabric and a preparation method thereof. The modified nano silicon dioxide has a nano scale effect, can efficiently shield ultraviolet radiation, and has chemical stability, endowing the material with inherent ability to resist external salt corrosion, and builds a double barrier of resistance to ultraviolet and salt corrosion in the fiber. The micro-nano surface topology of the pine needle shell layer increases the effective exposed area of the modified nano silicon dioxide, optimizes the functional interface, and the axial hollow cavity forms a stress buffer channel in the fiber, reduces the damage of external mechanical stress to the modified nano silicon dioxide dispersion structure to maintain uniform distribution. The high efficiency shielding and chemical resistance of the modified nano silicon dioxide resist ultraviolet penetration and salt erosion, and the micro-nano structure and hollow cavity of the pine needle shell layer maintain low temperature flexibility, and realize the balance of high water pressure resistance, waterproof and moisture permeability and resistance to ultraviolet and salt corrosion.

The application provides a polymethyl methacrylate product and a preparation method thereof. The preparation method of the polymethyl methacrylate product comprises the following steps: S1. mixing a resin matrix, a toughening agent, an antioxidant and a light stabilizer to obtain a mixture; the resin matrix comprises a polymethyl methacrylate resin; the toughening agent comprises a core-shell structure toughening agent and a polyester-based toughening agent; the core-shell structure toughening agent comprises a core and a shell layer; the core comprises polybutyl acrylate, and the shell layer comprises polymethyl methacrylate; S2. melt blending, extruding and granulating the mixture, and drying, injection molding, cooling and annealing. In the application, the core-shell structure toughening agent and the polyester-based toughening agent can synergistically improve the toughening effect.

The invention belongs to the technical field of light building materials, and particularly relates to a preparation method of normal-temperature mixed asphalt concrete. The preparation method of the normal-temperature mixed asphalt concrete comprises the following steps: uniformly mixing 90-100 parts by weight of aggregate, 10-20 parts by weight of limestone mineral powder and 6-12 parts by weight of a fiber material at room temperature, then adding 2-4 parts by weight of a polycarboxylic acid water reducer and 1-5 parts by weight of water, stirring for 20-30 minutes, then adding 20-30 parts by weight of carboxylated cationic emulsified asphalt, and stirring at normal temperature to obtain a mixture; and pouring the mixture to obtain the normal-temperature mixed asphalt concrete. According to the invention, the dynamic stability is effectively improved while good splitting strength is ensured, and the method can be applied to light building materials.

The invention discloses a preparation method for constructing a multistage micro-nano heterostructure based on combination of a laser melting deposition process and a laser shock peening means, which comprises the following steps of: printing by using dry TC4 alloy powder, accumulating a printed TC4 metal printing layer to form a TC4 metal micron layer, performing low-power laser shock peening on part of the TC4 metal micron layer to form a TC4 metal submicron layer, and forming the multistage micro-nano heterostructure. A TC4 metal printing layer is printed on the submicron layer and subjected to high-power laser shock peening to form a TC4 metal nano layer, a TC4 metal printing layer is printed on the nano layer and subjected to low-power laser shock peening to form a TC4 metal submicron layer, printing and cyclic operation are continued on the submicron layer to form a sample, and the sample is obtained through annealing treatment. According to the preparation method disclosed by the invention, a micron layer-nano sandwich composite layer-micron layer multi-stage micro-nano heterostructure is formed, crack propagation is effectively hindered, and the elongation of the material is improved, so that alloy strength and plasticity synergistic strengthening is realized.

The invention provides a carbon fiber sizing method, and belongs to the technical field of carbon fibers, the carbon fiber sizing method comprises the following steps: S1, providing a waterborne epoxy-polyurethane hyperbranched sizing agent; s2, diluting the sizing agent with deionized water until the concentration of the sizing agent is 1.5 wt%-3.5 wt%; s3, enabling the carbon fiber to be in contact with the diluted sizing agent, and performing sizing coating; and S4, the carbon fibers coated with the sizing agent are subjected to drying and heat treatment, and a sizing agent coating is formed on the surfaces of the carbon fibers. According to the invention, an epoxy-polyurethane hybrid system and a hyperbranched structure are combined, and a double-reaction-activity bridging agent is combined, so that the rigidity and high reaction activity of epoxy resin and the flexibility and toughness of polyurethane are combined through molecular design, and a hyperbranched interpenetrating network structure is constructed; effective improvements are achieved in the aspects of solving the surface inertia of the carbon fiber and improving the balance between the interface bonding strength and toughness of the composite material.

This invention discloses an organo-bentonite flame retardant synergist and its preparation method, belonging to the field of flame retardant materials technology. The preparation method includes: preparing calcium-based bentonite into a slurry, adding sodium carbonate for sodium purification; subjecting the purified slurry to high-pressure homogenization and flake removal; adding an organic modifier composed of octadecyl quaternary ammonium salt and dioctadecyl quaternary ammonium salt to the flaked slurry for intercalation modification, drying and dispersing; and adding end-functionalized polysiloxane to the organo-bentonite powder for surface coating treatment, thus obtaining the final product. The organo-bentonite flame retardant synergist prepared by this invention has a nanoscale layered structure and excellent compatibility with polyolefin matrices. When this synergist is combined with aluminum hydroxide for use in polyolefin composites, it can reduce processing torque, increase tensile strength, improve the limiting oxygen index to achieve UL-94V-0 rating, and simultaneously promote the formation of a continuous and dense expanded char layer, effectively inhibiting dripping.

The application provides a carbon fiber liquid-phase oxidation device and a carbon fiber production system, and belongs to the technical field of carbon fiber manufacturing. The carbon fiber liquid-phase oxidation device comprises an oxidation tank and a conveying unit. An oxidation tank liquid inlet is arranged on a first side wall of the oxidation tank, and an oxidation tank liquid outlet is arranged on a second side wall opposite to the first side wall of the oxidation tank. The oxidation tank liquid inlet and the oxidation tank liquid outlet are respectively located at two ends in the length direction of the oxidation tank, and are communicated by a circulating pump. The conveying unit is configured to convey the carbon fiber along the length direction of the oxidation tank, and to immerse the carbon fiber in the oxidizing solution in the oxidation tank during the conveying process. The carbon fiber liquid-phase oxidation device can effectively improve the problem of poor uniformity of the concentration of the oxidizing solution, so as to obtain a good surface pretreatment effect, and then make the carbon fiber after the sizing treatment have excellent interfacial bonding strength with the resin matrix.

The invention discloses a phase-convertible physical and chemical hybrid cross-linked high-silica resin-based composite material and a preparation method thereof. The material is subjected to primary transformation (50-100 DEG C): a crystalline region in a resin matrix is melted, a large amount of hydrogen bonds are dissociated, the modulus of the material is remarkably reduced, the material becomes flexible, and shape memory, small-scale damage repair (such as recess recovery) or interlayer welding can be carried out. And advanced transformation (gt; 130 DEG C): dynamic covalent bonds (such as ester exchange and DA reverse reaction) start to activate to realize topological rearrangement. And at the temperature, the whole composite material part can be subjected to large-scale remodeling and recycling. 500 DEG C in high-temperature service: when meeting open fire or an ultrahigh-temperature environment, the resin matrix is quickly carbonized, and forms a compact Si-O-C ceramic protection layer together with the high-silica reinforcement, so that excellent ablation resistance and heat insulation performance are achieved. The intelligent network provides a favorable molecular structure basis for active ceramic forming at high temperature.

The application relates to a method for improving the performance of lithium batteries by in-situ growth of carbon nanofibers on a silicon-carbon negative electrode through plasma induction, and belongs to the technical field of new materials and functional materials. The silicon-carbon negative electrode material is subjected to surface activation through plasma pretreatment technology, and then carbon nanofibers are in-situ grown through chemical vapor deposition to construct a three-dimensional conductive network structure. The plasma-assisted chemical vapor deposition technology is adopted, the silicon-carbon surface activated by plasma is used as a substrate, and in-situ growth is carried out to obtain uniformly distributed carbon nanofibers, so that a three-dimensional conductive composite structure closely combined with silicon-carbon particles is formed, and the high-rate cycle stability of the lithium ion battery is effectively improved.

This invention provides a composite cementitious material with high rheological properties, its preparation method, and concrete, comprising an active admixture, 40%–60% ordinary Portland cement, 20%–35% modified marble powder, and 0.8%–2% functional admixtures. The modified marble powder is obtained by surface modification treatment of marble powder with a silane coupling agent and a polycarboxylate superplasticizer, effectively solving the problem of marble powder agglomeration and ensuring uniform dispersion in the cementitious system. This significantly optimizes the rheological properties of the paste, improving fluidity and pumpability. The synergistic effect of cellulose ether and air-entraining agent in the functional admixtures further enhances the material's water retention and anti-segregation stability. The cementitious material prepared by this invention possesses both excellent mechanical properties and durability, and the concrete prepared with it exhibits good workability, dense structure, and reliable long-term performance. Simultaneously, this technology achieves high-value-added resource utilization of marble waste, reduces cement consumption and carbon emissions, and aligns with the direction of green building materials and sustainable development.

The invention relates to the technical field of coal mining, in particular to a cage type resistance-increasing large-deformation anchor rod and a using method thereof. The anchor rod comprises an anchor rod body, a guide rod, a cage pipe and a limiting piece, the anchor rod body comprises an anchoring section located at the front end of the anchor rod body and a threaded section located at the tail end of the anchor rod body and connected with the anchoring section, and the threaded section is provided with threads. The radial size of the cage pipe is increased by pushing the first push key, so that expansion of the cage pipe is realized, the anchoring agent is anchored in a pressed state, hole wall cracks and cavities are tightly filled, the interface bonding strength of the anchor rod body and the anchoring agent and the interface bonding strength of the anchoring agent and the hole wall are greatly enhanced, three-body two-interface damage is reduced from the source, and the service life of the anchor rod body is prolonged. The bottleneck of traditional anchor rod anchoring force improvement is broken through. When the anchoring force reaches the limit, no matter whether the anchor rod body is separated from the anchoring agent or the anchoring agent is separated from the hole wall of the anchoring drill hole, the cage pipe can further expand in the radial direction along with the movement of the anchor rod body, the extrusion force between the cage pipe and the hole wall is continuously increased, extra axial resistance is provided, and sudden failure of a supporting system is avoided.

The invention discloses light-cured piezoelectric ceramic slurry and a preparation method and application thereof.According to the light-cured piezoelectric ceramic slurry, two-functional-group aliphatic polyurethane acrylate, hexanediol diacrylate and trimethylolpropane triacrylate are compounded, a phosphate hyperdispersant is combined, firm chemical anchoring can be formed with modified barium titanate, and the piezoelectric ceramic slurry can be applied to light-cured piezoelectric ceramics. In addition, a curing system composed of low-viscosity active monomer hexanediol diacrylate, high-crosslinking-density trimethylolpropane triacrylate and a visible light initiator is adopted, the curing system is matched with the light absorption characteristic of modified barium titanate, and therefore the light absorption property of the modified barium titanate is improved. And enough penetration depth and interlayer binding force are ensured. A DLP technology is adopted to accurately print a ceramic green body framework at one time, a barium titanate ceramic framework with a complete structure and high density is obtained after degreasing and sintering, the 3-3 type piezoelectric composite material with controllable precision is prepared, the reflection loss of sound waves is reduced, and the quality of the material is further ensured.

The invention discloses an outer surface coating material of a composite material, and aims to provide a surface treatment method of a polyethersulfone modified composite material, which is convenient to prepare and suitable for low-cost large-scale preparation, and the coated material has better performance. GO coats SCF to form a coating body of the SCF, and the coating body is mixed with PES to form a multi-stage enhanced interface structure, so that the comprehensive performance of the composite material is comprehensively and remarkably improved on the whole, and GO can be massively prepared at relatively low cost, so that the finished product is easily available in raw materials, simple and convenient in process and suitable for low-cost large-scale production; and various performance detections are performed on the finished product, so that the reliability and consistency of the performance of the final product are ensured, and the method is suitable for the technical field of composite material surface treatment.

The invention relates to the technical field of civil engineering materials, in particular to modified steel fiber concrete and a preparation method thereof, and the concrete comprises the following raw material components in parts by weight: 350-450 parts of cement; 30 to 50 parts of fly ash; 80 to 120 parts of slag; 20 to 25 parts of silicon powder; 1100 to 1200 parts of stone; 130 to 150 parts of water; 1.0 to 1.8 parts of a water reducing agent; 15 to 20 parts of modified steel fiber; and 0.8 to 1.2 parts of polypropylene fiber. The caffeic acid molecules and the surface of the steel fiber form strong chemical interaction, a traditional physical bonding mode is fundamentally changed, the interface bonding strength and the mechanical property of a concrete matrix are improved, and a compact modified film is formed to enhance durability. Therefore, the problems of environmental pollution, poor cement matrix compatibility and the like are solved.

This invention relates to a low-flow FR-4 copper-clad laminate and its preparation method, belonging to the field of copper-clad laminate manufacturing technology. The copper-clad laminate includes a reinforcing material layer, a resin composition layer, and a copper foil layer. The resin composition comprises an epoxy resin main system, bismaleimide resin, a latent curing agent system, a rheology control agent, a reactive diluent, fillers, and additives. This invention achieves precise control of resin flow during lamination by constructing a high-crosslink density skeleton using a high-rigidity resin and bismaleimide resin, forming a thixotropic network with nano-silica and organically modified montmorillonite, and using benzoxazine and carboxyl-terminated nitrile butadiene rubber to synergistically reduce internal stress. The preparation method includes resin solution preparation, step-by-step pre-curing to obtain a prepreg, and segmented pressurization and heating lamination molding. The product of this invention possesses excellent anti-flow properties, high bonding strength, and good heat resistance, making it suitable for the lamination manufacturing of multilayer printed circuit boards with multiple layers.

The invention discloses a conductive adhesive for epoxy FOG-ACF as well as a preparation method and application of the conductive adhesive, and belongs to the technical field of electronic packaging materials. The preparation method of the conductive adhesive comprises the following steps: performing ultrasonic dispersion on conductive particles to form a suspension, and performing high-speed shearing pretreatment on fumed silica to form slurry; performing planetary stirring, mixing and dispersing on the suspension, the slurry, a polar modified cross-linked polymer prepared by a specific method, epoxy resin, a silane coupling agent, a dispersing agent, a filler and a curing agent, and finally defoaming and filtering to obtain a finished product. The polar modified cross-linked polymer is synthesized by carrying out free radical copolymerization reaction on a polyhydroxy acrylate intermediate and a polyurethane acrylate intermediate, wherein the polyhydroxy acrylate intermediate is prepared by carrying out ring opening esterification on an acrylic monomer and a polyfunctional group epoxy compound, and the polyurethane acrylate intermediate is prepared by carrying out polyurethane treatment on a hydroxyl-containing acrylate monomer and diisocyanate.

The application discloses a kind of low additional water full recycled concrete based on recycled fine aggregate wet packing gradation optimization and preparation method thereof, belong to building material technical field.The application is classified into three intervals by natural gradation recycled fine aggregate, after pre-wetting to saturated surface dry state, the wet loose bulk density under each mass proportion combination is determined, and the highest density is selected as the optimal artificial gradation;60% of the saturated surface dry water absorption of all recycled aggregates is determined as additional water;cement, recycled fine aggregate, recycled coarse aggregate, initial water and water reducing agent are used to prepare by using the layered feeding process of "cement pre-mixing→ neat paste preparation→ coarse aggregate→ fine aggregate".The obtained concrete has a slump of 160-190mm, a 28-day compressive strength of 25-40MPa, good fluidity, can meet the construction requirements of conventional concrete structure, and does not need chemical modification, low cost, suitable for building solid waste large-scale utilization.

This invention discloses a multi-temperature linkage temperature-controlled aluminum nitride heater and its preparation method, belonging to the field of semiconductor ceramic technology. The heater includes an aluminum nitride ceramic substrate and a supporting base. A double-layer heating electrode is stacked on the ceramic substrate, wherein the second heating electrode layer adopts a zoned conductive circuit, dividing the temperature zones from the inside out into a center, inner ring, and outer ring. The inner and outer rings can be further subdivided into multiple independent sector-shaped zones and powered independently. A ceramic thermal resistor is built into the bottom of each temperature zone, insulated from the circuit, and works in conjunction with a PID controller to achieve zoned closed-loop temperature control. This invention solves the problems of poor temperature uniformity, localized overheating, and external temperature measurement lag in single-layer heating by using a double-layer heating synergy and a built-in temperature measurement structure, significantly improving temperature control accuracy and temperature uniformity. Simultaneously, a special aluminum nitride-based solder is used to connect the substrate and the base, resulting in good thermal expansion matching, high interface strength, excellent airtightness, and the ability to withstand high temperatures and thermal cycling shocks, adapting to the requirements of high-end semiconductor processes.