428results about How to "Improve the interface binding force" patented technology

The invention belongs to the technical field of polymer plastic materials, and particularly relates to a high-temperature-resistant anti-corrosion polytetrafluoroethylene material and a preparation method thereof. The polytetrafluoroethylene is prepared from the following raw materials in parts by weight: 50 to 60 parts of polytetrafluoroethylene, 5 to 10 parts of fluorinated modified graphene oxide, 3 to 5 parts of aluminum powder, 5 to 8 parts of modified silicon carbide fiber, 3 to 5 parts of silane modified nano silicon dioxide, 2 to 3 parts of polyphenylene sulfide, 2 to 3 parts of polyimide, 0.5 to 0.8 part of dispersing agent and 0.5 to 1 part of antioxidant. The heat conduction performance and the interface bonding force are improved through the fluorinated modified graphene oxide, the impact resistance and the wear resistance are enhanced through the silicon carbide fibers, and the corrosion resistance and the wear resistance are improved through the aluminum powder; silane modified silicon dioxide enhances the mechanical property of the composite material by improving the dispersity of the filler, and PPS and PI interact with the surface of the filler through polar groups in molecular chains, so that the interface strength is improved, and the toughness and the thermal stability are improved.

The invention relates to the technical field of building materials, and particularly discloses high-strength lightweight concrete containing hollow glass beads and a preparation method of the high-strength lightweight concrete. The high-strength lightweight concrete containing the hollow glass beads is prepared from cement, fly ash, carbon fiber grafted hollow glass beads, lightweight sand, deionized water, polypropylene fiber grafted rubber particles and a water reducing agent according to the mass ratio of (58-75): (25-38): (45-65): (20-40): (42-55): (35-55): (5-12) through mixing, mold filling, vibration molding, covering and demolding. The addition amount of the hollow glass beads is strictly controlled, the influence on the overall strength of the concrete is avoided, the density and weight of the concrete are reduced due to the addition of the light sand and the hollow glass beads, the compactness and integrity of the concrete are improved due to the synergistic effect of the two added fibers, and the raw materials have excellent cohesiveness; the concrete can effectively absorb and disperse stress, and has the advantages of excellent strength, light weight, good durability and excellent comprehensive performance.

The invention provides a preparation method of a high-temperature-resistant antioxidant chopped carbon fiber reinforced ceramic-based composite material, and relates to the field of ceramic-based composite material preparation, and the preparation method comprises the following steps: S1, selection and surface treatment of reinforced fibers: selecting chopped carbon fibers as a reinforced material, and carrying out surface modification treatment on the chopped carbon fibers to obtain the reinforced fibers; according to the present invention, the surface modification treatment is performed on the short carbon fiber, and particularly the SiC coating is coated on the fiber surface by using the chemical vapor deposition (CVD) method, such that the oxidation resistance of the carbon fiber under the high temperature condition is effectively improved. The coating enhances the stability of the fiber, reduces the oxidation loss of the fiber at high temperature, enhances the interface bonding force between the fiber and the ceramic matrix, and avoids stripping or interface failure in a high-temperature environment, thereby ensuring the overall stability and service life of the material.

The invention belongs to the technical field of material preparation, and aims to solve the problems of interface separation and weak oxidation resistance under complex working conditions caused by insufficient interface bonding force of the existing carbon / carbon composite material. In order to achieve the purpose, the invention provides a carbon / carbon composite material and a preparation method thereof. The carbon / carbon composite material comprises the following components in percentage by mass: 40%-55% of polyacrylonitrile-based carbon fibers, 10%-25% of pitch-based carbon fibers, 8%-20% of nano silicon dioxide grafted carbon fibers, 8%-20% of biological pitch, 8%-15% of nano graphene modified phenolic resin, 3%-6% of silicon carbide whiskers, 2%-4% of zirconium boride nanoparticles, 2%-4% of graphitized carbon fibers and 1%-3% of a natural plant extract antioxidant. The carbon / carbon composite material provided by the invention can provide stable interface bonding force and remarkable oxidation resistance, so that the structural integrity and mechanical property stability of the material when bearing various complex stresses such as stretching, compression, bending, shearing and the like are guaranteed, and the application range of the material in the field of high-temperature oxidation resistance is widened.

The invention relates to the technical field of waste rubber recovery, in particular to a method for preparing a rubber compound by recycling waste rubber and the prepared rubber compound. The high-shear mechanical desulfurization technology is combined, the desulfurization efficiency is further improved through the synergistic effect of various components in the compound auxiliary, and meanwhile the plasticity of the waste rubber and the compatibility of the waste rubber and new rubber are enhanced. The method not only can effectively destroy the cross-linked structure of the waste rubber, but also can be used for preparing a high-performance rubber compound product by mixing the waste rubber with a new rubber material through a subsequent mixing process, and is widely applied to manufacturing high-strength and wear-resistant rubber products, such as solid tires and the like.

The invention provides magnesium phosphate cement-based concrete. The magnesium phosphate cement-based concrete is prepared from the following raw materials in parts by weight: 10-20 parts of phosphate, 30-50 parts of active magnesium oxide, 0.5-3 parts of a retarder, 5-15 parts of a mineral admixture, 0.5-4 parts of a functional additive, 20-30 parts of fine aggregate, 2-5 parts of reinforced fibers and 10-28 parts of water. The invention also provides a preparation method of the magnesium phosphate cement-based concrete. The magnesium phosphate cement-based concrete provided by the invention has a multi-layer anti-corrosion barrier, a compact microstructure, an intelligent ion barrier and good environmental adaptability, and can meet the use requirements in complex and severe environments.

The invention discloses a hydrogen evolution electrode for an AEM electrolytic cell cathode and a preparation method thereof, the electrode sequentially comprises a substrate net, a metal bottom layer and a catalyst layer, the substrate net is selected from a stainless steel net or a nickel net, the metal bottom layer is formed on the substrate net through physical vapor deposition, and the material is selected from Ni, Ti, alloys thereof or oxides thereof; the catalytic layer is deposited on the metal bottom layer through physical vapor deposition and sequentially comprises a catalytic bottom layer, a catalytic middle layer and a catalytic outer layer, and the porosity is gradually increased. The preparation method comprises the following steps: roughening the acid etching surface of a substrate net, forming a metal bottom layer on the substrate net through physical vapor deposition, sequentially forming a catalytic bottom layer, a catalytic middle layer and a catalytic outer layer on the surface of the metal bottom layer through physical vapor deposition to obtain a catalytic layer, and performing post-treatment on the catalytic layer through plasmas doped with elements to form a porous network structure. And the corrosion resistance and the catalytic effect of the AEM electrolytic cell cathode in an alkaline environment are greatly improved.

The invention belongs to the field of high polymer materials, and discloses a surface flame-retardant compatibilization glass fiber reinforced PPE / PS alloy material and a preparation method thereof, the alloy material comprises the following raw materials by weight: 10-84.98% of bulk flame-retardant MPPE resin; 5-35% of polystyrene resin; 10 to 40% of flame-retardant glass fiber; 0.01 to 10% of a flame retardant; 0.01 to 2% of a synergistic flame retardant; and 0-3% of other auxiliary agents. The prepared PPE / PS alloy material has excellent mechanical properties, processability and flame retardance, and can be used in the fields of household appliances, electric appliances, automobiles, optical fiber parts and the like.

The invention belongs to the technical field of CPVC pipe preparation, and provides a high-strength toughened CPVC pipe and a preparation method thereof. Firstly, butadiene and divinyl benzene are copolymerized to form a high-crosslinking structure, rigid support is provided, butyl methacrylate and acrylonitrile are copolymerized, flexibility and polarity are adjusted, interface bonding force is enhanced, and acrylic acid, epoxy acrylate and ethyl methacrylate are copolymerized to optimize compatibility with a matrix; secondly, through copolymerization of monomers such as 2-sulfonic acid ethyl methacrylate, polyethylene glycol methacrylate and dimethylacryloyloxyphosphonic acid, the polarity and flexibility of the compatilizer are adjusted, and the interface bonding strength of the compatilizer to a CPVC matrix and a modified elastomer is improved, so that the mechanical property of the composite material is remarkably improved; finally, nano SiO2 is subjected to surface modification through a silane coupling agent, so that the dispersity of the inorganic filler and the binding force with a matrix are improved, and the rigidity and the thermal stability of the composite material are enhanced.

The invention relates to the technical field of hydrogel, in particular to attapulgite-based hydrogel and a preparation method thereof. The hydrogel is prepared by polymerizing an alkenyl monomer and modified attapulgite, and the modified attapulgite is obtained by modifying attapulgite with branched acrylate quaternary ammonium salt. The hydrogel shows excellent water absorption, water retention and mechanical properties. The water absorption rate reaches up to 292%, the water retention capacity is excellent in the low-humidity environment, water can be kept for a long time in the drought or low-humidity environment, the continuous water supply capacity is remarkably improved, and the water retention agent is suitable for the fields of agriculture, soil improvement and ecological restoration.

The invention relates to the technical field of silica gel sheets, in particular to a high-strength wear-resistant heat-conducting composition and a preparation method and application of a silica gel sheet. The invention discloses a high-strength wear-resistant heat-conducting composition which comprises the following components in parts by weight: 1-5 parts of methyl vinyl silicone rubber; 15 to 20 parts of vinyl silicone oil; 2-10 parts of white carbon black; 0.5-1 part of a first coupling agent; 50-70 parts of a heat conducting filler; 0.1 to 0.2 part of a chain extender; 5-10 parts of a cross-linking agent; 0.01 to 0.02 part of a catalyst; and 0.01 to 0.05 part of a polymerization inhibitor. According to the silica gel sheet provided by the invention, the binding force between the filler and the silica gel matrix is enhanced through the high heat conduction characteristic of the heat conduction filler powder and the treatment of the coupling agent, so that the overall heat conduction performance of the material is improved. Meanwhile, by controlling the particle size and the shape of the filler and adopting methods such as ball milling treatment, the mechanical property of the material is ensured, and the stable performance can be kept in long-time use.

The invention relates to a super-hydrophobic antifouling self-cleaning coating and a preparation method thereof. The coating comprises the following components in parts by weight: 20-50 parts of fluorocarbon resin; 1-10 parts of modified graphene oxide; 1 to 10 parts of modified nano silicon dioxide; 5-15 parts of a curing agent; 1-5 parts of a dispersant; 1-5 parts of a leveling agent; 1-5 parts of a defoaming agent; 30 to 60 parts of a solvent; the modified graphene oxide is prepared by modifying graphene oxide with gamma-methacryloxy propyl trimethoxy silane, and the modified graphene oxide is prepared by modifying graphene oxide with gamma-methacryloxy propyl trimethoxy silane; the modified nano silicon dioxide is prepared by modifying silicon dioxide through octyl triethoxy silane and nonafluorohexyltriethoxy silane. Compared with the prior art, the coating obtained by the invention has the advantages of excellent adhesive force, super-hydrophobicity, strong cleaning capability, difficulty in causing pollution, excellent acid resistance, alkali resistance and salt spray resistance, and can be applied to places such as buildings, cross-sea bridges, ships and the like which are eroded by rainwater for a long time and corroded by seawater.

The invention relates to the field of environment-friendly materials, and particularly discloses modified waste rubber powder with a temperature-sensitive characteristic and a preparation method and application thereof.The preparation method of the modified waste rubber powder comprises the following steps that S1, waste rubber powder pretreatment is conducted, specifically, after waste rubber powder is cleaned to remove impurities, the waste rubber powder is soaked in a sodium hydroxide solution and then washed and dried, and pretreated waste rubber powder is prepared; s2, mixing the pretreated waste rubber powder with a dilute sulphuric acid solution, and drying to obtain primarily modified waste rubber powder; s3, mixing and dispersing the primarily modified waste rubber powder and carboxylated nano silicon dioxide, performing pressurized dipping treatment in a modification solution, and drying to obtain modified waste rubber powder; the modified liquid is mainly prepared from PAMAM (Polyamidoamine), polyisopropylacrylamide, genipin, polyvinyl alcohol and hydroxypropyl beta-cyclodextrin; the invention also discloses the modified waste rubber powder prepared by adopting the method and application of the prepared modified waste rubber powder in a concrete material. According to the invention, the waste rubber powder is modified so as to improve the strength and durability of concrete applied with the waste rubber powder.

The invention relates to the technical field of polyurethane, and discloses a high-conductivity carbon nanotube modified polyurethane fiber membrane, which is characterized in that carbon nanotubes react with 1, 4-butanediamine to obtain aminated carbon nanotubes, 2, 4-toluene diisocynate reacts with polytetrahydrofuran ether glycol to form a polyurethane precursor, and the polyurethane precursor further reacts with 2, 2-dimethylolpropionic acid, 2, 2-dimethylolpropionic acid, 2, 2, 2-trimethyl-1, 3-pentanediol, 2, 2, 4-trimethyl-1, 3-pentanediol, 2, 2, 4-trimethyl-1, 3-pentanediol, 2, 2, 4-trimethyl-1, 3-pentanediol, 2 4-dihydroxyanisole reacts with N-methyldiethanolamine to obtain aldehyde polyurethane, the aldehyde polyurethane reacts with the aminated carbon nanotubes to finally obtain the composite fiber membrane, the interface bonding force of the carbon nanotubes and the polyurethane is enhanced through connection of chemical bonds, and when the composite fiber membrane is subjected to external force, stress passes through chemical cross-linking points, so that the composite fiber membrane is formed. The stress is transferred to the carbon nano tube from the polyurethane matrix, the carbon nano tube can absorb and transfer the stress, and the carbon nano tube can form a conductive network, so that the conductivity of the polyurethane is improved.

The invention relates to the technical field of fibers, in particular to a PTT / PA eccentric core-sheath composite fiber and a preparation method thereof. The comprehensive performance of the fiber is remarkably improved through eccentric structure design and introduction of an alkyl chain into a PA sheath layer to modify PA. The composite fiber is composed of a PTT core layer and a PA sheath layer, the sheath layer contains alkyl chain modified PA, and the fiber shows excellent breaking strength, curling performance and thermal stability. The eccentric structure effectively disperses stress, brittle fracture is avoided, meanwhile, the alkyl chain modified PA enhances the flexibility and interface bonding force of a molecular chain, and the dimensional stability and thermal stability of the fiber are improved. The invention is suitable for the fields of clothing, home textiles and high-temperature industrial fibers, and meets the requirements of high strength, high elasticity and high-temperature stability.

The invention belongs to the technical field of materials, and particularly relates to a carbon fiber pretreatment method, a carbon fiber pretreatment product and application of a fully-wound gas cylinder. According to the technical scheme, the carbon fibers are subjected to pretreatment and plasma treatment, the surface activity of the carbon fibers is remarkably enhanced, and the interface bonding force between the carbon fibers and a resin matrix is improved by 30%-50%. The durability of the gas cylinder sample in a fatigue test is improved by more than 20%, and the phenomena of interface stripping and layering are avoided. And according to the requirements of the actual application environment, the technical scheme can flexibly adjust parameters such as treatment gas, time and power, and the optimal performance is realized.

The invention relates to a shape memory polyimide composite material with a spider-silk-like microstructure and a preparation method and application thereof. According to the method, the composite material is designed by coupling the spider-silk-like microstructure, shape memory polyimide, a flame retardant and an electromagnetic shielding two-dimensional intercalation compound. Conductive polyaniline and transition metal carbon / nitride are subjected to an intercalation reaction to prepare a Ti3C2Tx-coated PANI intercalation compound, then the Ti3C2Tx-coated PANI intercalation compound is compounded with SMPI to serve as a spider-silk-like microstructure to enhance the mechanical strength and electromagnetic shielding performance of a resin matrix, and when the thickness of the SMPI composite material is 100 micrometers, the electromagnetic shielding effectiveness of the SMPI composite material in the X wave band exceeds 25 dB, and 99% or above of incident microwaves are effectively shielded. In addition, the flame retardant grade of the composite material reaches V0 grade, the limit oxygen index is 39.1%, the composite material also has high temperature resistance and shape memory characteristics, the shape fixation rate is 96%, and the shape recovery rate is 97%. The composite material not only can eliminate electromagnetic interference, but also can resist flame, can be automatically deformed, and is applied to the fields of self-adaptive deformation thermal management electromagnetic shielding devices, intelligent wearable equipment and the like.

The invention belongs to the technical field of cutter materials, and particularly relates to a nano-composite coating hard alloy cutter for intermetallic compound / high-temperature alloy machining and a preparation method of the nano-composite coating hard alloy cutter. An intermetallic compound / high-temperature alloy is a novel key material for aero-engines, is a difficult-to-process material, has high red hardness and good wear resistance, is easy to generate brittle fracture at high temperature, and is easy to generate thermal expansion and deformation in the processing process. Lanthanum-doped tungsten carbide and modified nickel powder are matched with other raw materials to prepare a novel hard alloy matrix, a boron nitride composite material and magnetic chitosan in the coating are matched, the hard alloy cutter is prepared, through the combined action of multiple components, the bending strength and hardness of the cutter material are effectively improved, and the service life of the cutter material is prolonged. Therefore, the good binding force between the coating and the matrix is enhanced.

The invention relates to modified polyamide particles as well as a preparation method and application thereof, and belongs to the technical field of polyamide particles. The modified polyamide particle comprises the following components: polyamide resin, a modified composite filler, a compatibilizer, an antioxidant and a lubricant. The preparation method comprises the following steps: banburying and mixing the polyamide resin, the compatibilizer, the antioxidant and the lubricant, adding the mixture into a double-screw extruder from a main feeding port, adding the modified composite filler from a side feeding port, and carrying out melt extrusion, cooling and pelletizing to obtain the modified polyamide particles. Zirconium oxide is generated on glass fibers, more silane coupling agents are grafted in combination with a tetramethylammonium hydroxide and ethidene diamine compound catalyst, the interface bonding force between the composite filler and polyamide is increased, the surface of the composite filler is modified through syringaldehyde, the compatibility with a polyamide system is increased, and meanwhile, the composite filler can be used for preparing the composite filler. The modified polyamide particles can react with acid anhydride in a styrene-maleic anhydride copolymer, and the mechanical strength of the modified polyamide particles can be improved.

The invention relates to the technical field of self-cleaning coatings, in particular to a two-component inorganic super-hydrophilic self-cleaning coating and a preparation method and application thereof.The preparation method comprises the following steps that 1, gamma-aminopropyltriethoxysilane is dissolved in an ethanol water solution, then titanium dioxide sol is added, stirring reaction is conducted for 2-4 h at the temperature of 40-50 DEG C, and modified titanium dioxide sol is obtained; (2) dispersing nano-montmorillonite in ethanol, then adding tea polyphenol, and performing ultrasonic dispersion for 0.5-1 hour to obtain a modified nano-montmorillonite suspension; (3) mixing a cerium nitrate solution with the alumina sol, then adding the modified montmorillonite suspension, and uniformly mixing to obtain composite alumina sol; and (4) mixing and cross-linking the prepared modified titanium dioxide sol and composite aluminum oxide sol to obtain the self-cleaning coating. The long-acting super-hydrophilic self-cleaning coating provided by the invention has the advantages of excellent self-cleaning capability, stable and long-acting super-hydrophilicity, wear resistance and antistatic effect.

The invention relates to the technical field of building materials, in particular to magnesium oxide carbonized foundation solidified soil and a preparation method and application thereof.Soil is adopted as filler, active magnesium oxide is adopted as a cementing material, and meanwhile microorganisms capable of generating carbonic anhydrase are added, so that the carbon sequestration capacity is improved; and a self-developed reinforcing agent is added to reinforce the solidified soil, so that the carbon dioxide absorption amount is synergistically improved, and the prepared solidified soil is high in mechanical property and carbon sequestration capacity and can be used as a foundation raw material for construction.

The invention relates to the technical field of coating preparation, and provides a polyurethane conformal coating preparation method which comprises the following steps: S1, inputting requirements of a conformal coating product and used environmental conditions into a weighing module by an operator, and triggering the weighing module to automatically adjust the ratio of raw materials; s2, sequentially adding the weighed polyurethane resin, curing agent, diluent and assistant into a mixing module, mixing to form a mixed raw material, and collecting state data in the mixing process; s3, obtaining the state data through an evaluation module, and carrying out the evaluation to form an evaluation result; s4, if the mixing qualified threshold value is met, heating the mixed raw material through a heating module; s5, transferring the heated mixed raw material into a reaction kettle to form a reaction raw material; s6, rapidly cooling the reaction raw materials to room temperature, and removing impurities to obtain a conformal coating mother solution; and S7, adding the pretreated nano filler into the mother liquor of the conformal coating, and adding a multi-interface reinforcing agent to form a conformal coating product.

The invention discloses a tundish cover castable, and relates to the technical field of tundish refractory materials. The tundish cover castable is prepared from the following raw material components in percentage by mass: 7.8 to 9.6 percent of alumina of 8 to 5mm, 2.6 to 4.3 percent of alumina of 5 to 3mm, 2.6 to 4.3 percent of alumina of 1 to 0mm, 17.4 to 20.8 percent of alumina of 200 meshes, 9.6 to 13 percent of mullite of 5 to 3mm, 22.6 to 26 percent of mullite of 3 to 1mm, 9.6 to 13 percent of mullite of 1 to 0mm, 7 to 8.7 percent of mullite of 200 meshes, 2.6 to 3.5 percent of composite binding agent, 0.8 to 1.7 percent of aluminum silicate, 0.05 to 0.07 percent of SiC nanowire, 0.2 to 0.3 percent of aluminum titanate and the balance of water. The invention discloses a tundish cover castable which comprises the following components in percentage by weight: 0.4-0.7% of alumina micro powder, 0.08-0.11% of sodium tripolyphosphate, 2.6-3.5% of silica fume, 0.87% of steel fiber and 1.3-1.7% of high-alumina cement. Compared with a traditional process, the tundish cover castable has the advantages that the overall performance of the tundish cover castable is remarkably improved, the breaking strength and compression strength of the castable are effectively enhanced, the service life is remarkably prolonged, and the production cost is reduced. And the production cost is greatly saved, and the economical efficiency and the operation rate of continuous casting operation are improved.

The invention belongs to the technical field of polytetrafluoroethylene microporous membranes, and relates to an Al2O3 / PTFE composite microporous membrane and a preparation method and application thereof.The Al2O3 / PTFE composite microporous membrane is composed of Al2O3 nanoparticles and PTFE resin, the porosity is 65%-95%, the thickness is 3-25 microns, the average pore size is 0.10-1.5 microns, the transverse and longitudinal tensile strength is larger than or equal to 20 MPa, and the water contact angle is smaller than or equal to 90 degrees. According to the invention, the Al2O3 / PTFE composite microporous membrane is endowed with good surface wettability and excellent mechanical property by utilizing self-humidifying and in-situ reinforcement of Al2O3 nanoparticles, and the Al2O3 / PTFE composite microporous membrane is mainly applied to a reinforcing material of a proton membrane. The preparation process is simple, and industrial popularization is easy to realize.

The invention discloses a high-toughness biodegradable material for film blowing forming and a preparation method of the high-toughness biodegradable material, and belongs to the technical field of biodegradable materials. Comprising 50-60 parts of polyethylene, 8-16 parts of poly (butylene adipate / terephthalate), 6-12 parts of polylactic acid, 4-9 parts of self-made nano silicon dioxide modified lignin, 3-8 parts of modified nano calcium carbonate, 1-2 parts of a plasticizer, 3-5 parts of a compatilizer, 0.2-1 part of a lubricant, 0.3-1.5 parts of carbon black and 0.2-0.8 part of an antioxidant. According to the material for film blowing forming, the self-made nano silicon dioxide modified lignin and the modified nano calcium carbonate are compounded for use, so that the material has ultrahigh toughness, and by adding the poly (butylene adipate-co-terephthalate), the polylactic acid and the lignin, the positive effect on the biodegradability of the material is achieved; therefore, a relatively good biodegradation effect is achieved.

The invention relates to a polyamide composite membrane containing a middle layer and a preparation method of the polyamide composite membrane. The polyamide composite membrane comprises a polyborosiloxane-based porous polymer substrate, a modified polyimide middle layer and a polyamide separation layer, a modified polyimide intermediate layer is loaded on the surface of the porous polymer substrate, and a polyamide separation layer is loaded on the surface of the modified polyimide intermediate layer. The polyborosiloxane-based porous polymer substrate and the modified polyimide intermediate layer have better compatibility, interface defects can be reduced, the overall performance of the membrane can be improved, moreover, the polyborosiloxane-based porous polymer substrate also has a self-healing characteristic, and after the polyborosiloxane-based porous polymer substrate is damaged, the self-healing property of the polyborosiloxane-based porous polymer substrate is improved. Fractured connection can be repaired without external stimulation (such as light and heat), and self-repairing of the substrate is achieved.

The invention relates to the technical field of sandwich composite materials, and discloses a web-reinforced sandwich composite structure prepared by using a thermal expansion compression molding process and a method of the web-reinforced sandwich composite structure. Firstly, a light core (hard foam, balsa wood, honeycombs and the like) is cut into a required shape, an expandable foam prepreg film is cut according to a designed web structure, the interior and exterior of the web structure and the outer contour of the whole product are coated with expandable foam glue, then composite prepreg is laid on the product according to design requirements, and the composite prepreg is formed. And the web plate reinforced sandwich composite material structure is formed by utilizing internal expansion force generated by limited foaming in a thermal expansion foam pre-impregnated glue film mold. The maximum expansion force of the thermal expansion compression molding process can be maintained after the epoxy resin gel point, so that the performance of the web reinforced sandwich composite material is fully ensured, and the structural performance of the prepared web is enhanced.

The invention relates to a high-temperature-resistant high-toughness epoxy adhesive film and a preparation method thereof, and belongs to the technical field of epoxy adhesive films. The high-temperature resistance and mechanical strength of the filler are remarkably improved by calcining a mixture of magnesium phosphate, glucose and montmorillonite at a high temperature, filler agglomeration is reduced by a carbonaceous film formed by carbonizing glucose, and the dispersity and compatibility are improved; after the carbon fibers are pretreated by nitric acid, the interface bonding force between the carbon fibers and the resin matrix and the calcined montmorillonite is enhanced, and the overall toughness of the composite filler is improved; and the composite filler forms a skeleton structure in a resin matrix, so that the toughness and high temperature resistance of the epoxy adhesive film are effectively improved. Besides, the polyamic acid is added into the epoxy resin, and the high temperature resistance and toughness of the epoxy resin are further improved through the formation of a semi-interpenetrating network structure or chemical bond action by utilizing the characteristic that a polyamic acid molecular chain segment can maintain relatively good mechanical properties at high temperature; the prepared epoxy adhesive film is suitable for various application scenes with high-temperature and high-toughness requirements.

The invention relates to the technical field of superhard composite materials, in particular to a manufacturing method of a superfine diamond compact, which is characterized by comprising the following steps: S1, raw material selection and pretreatment: diamond particles: selecting high-purity diamond powder with the particle size of 0.1-1 mu m; a hard alloy, such as a cobalt-based alloy, is adopted as a matrix material; nanoscale ceramic particles such as silicon nitride and aluminum oxide are added to serve as the reinforcing materials, gaps between the base body and the diamond particles are filled, and the compactness of the materials is improved; and S2, diamond particle uniform distribution treatment is conducted, specifically, a mechanical stirring and ultrasonic dispersion combined method is adopted, the diamond particles and the matrix powder are fully mixed, the matrix powder and the diamond particles are stirred at a low speed through mechanical stirring, and the particles are preliminarily dispersed. And the uniformity is improved: mechanical stirring, ultrasonic dispersion and electrostatic dispersion are combined, so that the distribution uniformity of diamond particles in a matrix is remarkably improved.

The invention provides a diamond and negative expansion particle reinforced aluminum matrix composite and a preparation method, and belongs to the technical field of composites. The aluminum-based composite material is composed of a diamond phase and a negative thermal expansion phase which are dispersed in an aluminum matrix. The average particle size of the diamond phase is 10-1000 [mu] m, and the ratio of the average particle size of the diamond phase to the average particle size of the negative thermal expansion particles is 10-20; the particle size of the negative thermal expansion particles adjacent to the diamond phase is smaller than that of the negative thermal expansion particles away from the diamond phase. The diamond and negative expansion particle reinforced aluminum-based composite material with excellent thermophysical performance is obtained by regulating and controlling the volume fraction of the diamond and the negative expansion particles, the thermal expansion coefficient matched with a semiconductor material is prepared through a collaborative optimization strategy, and the diamond and negative expansion particle reinforced aluminum-based composite material is applied to the field of electronic packaging heat dissipation materials.