1487 results about "Polyurea" patented technology

The invention belongs to the technical field of composite coatings, and particularly relates to a corrosion-resistant and ultraviolet-resistant protective coating for wind power generation equipment and a preparation method thereof.The corrosion-resistant and ultraviolet-resistant protective coating for the wind power generation equipment is prepared from, by mass, 40-60 parts of gradient fluorosilicone modified polyurethane resin, 5-12 parts of core-shell type ZnO-coated MOFs composite particles, 1-3 parts of a curing agent, 1-3 parts of a curing agent and 1-3 parts of a curing agent. According to the invention, the problems of poor ultraviolet resistance, poor weather resistance, poor corrosion resistance, poor corrosion resistance, poor corrosion resistance, poor corrosion resistance, poor corrosion resistance and the like in the existing coating and the preparation process thereof are well solved; the shielding layer is single and incapable and has a poor self-repairing effect; and the coating toughness of an epoxy resin system is insufficient and cannot adapt to fatigue deformation of equipment under a vibration working condition.

The invention relates to the technical field of sole processing, in particular to a sole composite processing method, which comprises the following steps: according to the rigidity requirement of an arch support area, preparing high-density slurry in which silicon nitride ceramic powder accounts for 30-40%, forming # imgabs0 # crystal phase through microwave-assisted sintering, and controlling the porosity to be 10-20%; according to the energy rebound requirement of the forefoot buffer area, graphene oxide / carboxymethyl cellulose aerogel powder is added into the slurry until the concentration is 25%, and the porosity is increased to 40-60% by combining the honeycomb porous network design; a nano silicon dioxide reinforcing agent is introduced into a wear-resistant area of the heel to 15%, a diamond-like carbon coating is formed through plasma surface treatment, and the porosity is limited to be 5-15%. According to the invention, silane is encapsulated by adopting polyurea microcapsules, and is released only when the material is damaged, so that dynamic self-repairing is realized, the shoe sole is endowed with dynamic repairing capability, and the service life is prolonged.

The invention discloses an MXene-based coating with a near-infrared light induction interaction effect and a preparation method of the MXene-based coating, and relates to the technical field of coatings. The preparation method comprises the following steps: a nano microcapsule and MXene powder are subjected to in-situ growth to form a composite dispersion liquid, the nano microcapsule is of a core-shell structure, a shell layer material is selected from at least one of polyaniline, polyurea, polyurethane, polyacrylate and silicon dioxide, a core contains a functional substance, and the surface of the core contains a porous material. The functional substances are selected from at least two of a corrosion inhibitor, a fluorescent indicator and a lubricant; adding a thermal reversible coating containing dynamic covalent bonds and a curing agent into the composite dispersion liquid, and uniformly mixing to form a homogeneous coating; and spraying the homogeneous coating on the surface of a base material, and curing to obtain the coating. The coating is high in mechanical strength, has a near-infrared light triggered self-repairing function, is high in self-repairing rate, and can realize multiple functions such as fluorescence labeling, corrosion early warning and lubrication coordinated regulation and control.

A thermoplastic polyurea comprising an aliphatic diamine unit (A) that has a linear aliphatic hydrocarbon group and an aliphatic diamine unit (B) that has a C7-12 methyl-branched aliphatic hydrocarbon group on the main chain.

The invention provides a self-repairing hydrated salt phase change microcapsule as well as a preparation method and application thereof, and belongs to the field of phase change materials. The preparation method comprises the following steps: preparing a hydrated salt phase change material and sorbitol into eutectic melt by adopting a melting method; strontium carbonate, sorbitol grafted nano titanium dioxide, SiO2-coated silicone rubber microspheres, hollow Al2O3 microspheres, tannic acid microcapsules, alpha-zirconium phosphate, melamine polyphosphate, diethyl aluminum hypophosphite, carboxylated multi-walled carbon nanotubes, polydopamine modified boron nitride nanosheets and hydrophilic fumed silica are added into the eutectic melt, and blending is performed to obtain a core material; The preparation method comprises the following steps: adding strontium carbonate, sorbitol grafted nano titanium dioxide, SiO2-coated silicone rubber microspheres, hollow Al2O3 microspheres, tannic acid microcapsules, alpha-zirconium phosphate, melamine polyphosphate, diethyl aluminum hypophosphite, carboxylated multi-walled carbon nanotubes, polydopamine modified boron nitride nanosheets and hydrophilic fumed silica into the eutectic melt; bio-based polyurethane-polyurea is used as a shell material, the core material is coated in the shell to prepare the microcapsule, and the temperature of the coating operation is not higher than the phase change temperature of the hydrated salt phase change material; the surface is coated with a super-hydrophobic coating. According to the invention, a solid filler system is constructed, and a low-temperature preparation process is combined, so that the phase-change microcapsule with high performance, high reliability and high safety is developed.

The invention relates to the technical field of adhesives and pouring sealants, and particularly discloses a high-thermal-conductivity and high-temperature-resistant epoxy resin pouring sealant with cold and hot impact resistance, which comprises 100 parts of organic silicon modified epoxy resin with the epoxy value of 0.450-0.550 eq / 100g and the viscosity of 3000-25000mPa. S at 25 DEG C; the capsule wall material is a polyurea-silicon dioxide compound, and the wall thickness of the capsule wall material is 0.5-2 microns; 600 to 1000 parts of surface modified composite heat conduction powder; the core layer is made of nitrile rubber, the shell layer is made of polysiloxane, and the shell layer accounts for 10-30 wt%; through the synergistic effect of the surface modified composite heat-conducting powder and the core-shell structure elastomer, the mechanical strength of the material is remarkably improved while high heat conductivity is guaranteed, and compared with a traditional system, the heat-conducting property and the tensile strength are improved.

The invention provides a modified single-component polyurea waterproof coating as well as a preparation method and application thereof and a hydraulic concrete protective coating structure, and relates to the technical field of hydraulic concrete protection. The modified single-component polyurea waterproof coating provided by the invention is prepared from the following raw materials by mass: polytetrahydrofuran polyol, polyether triol, fluorine-containing polyether polyol, FEVE type fluorocarbon resin, organic silicon polyether glycol, a water repellent agent, isocyanate, a defoaming agent, a diluent, a dispersing agent, a catalyst, a latent curing agent, a coupling agent, a water removal agent, a pigment filler, a thixotropic agent and a plasticizer. The modified single-component polyurea waterproof coating has excellent comprehensive mechanical properties, anti-icing adhesion performance and ice pulling resistance, and the problem of freezing injury is thoroughly solved; the surface roughness is low, the hydrophobicity is high, and resistance and roughness are reduced; the water resistance is high; the coating is high in adhesive force. The modified single-component polyurea waterproof coating is applied to cold region hydraulic concrete anti-freezing damage protection engineering, and the long-term operation protection performance is good.

The invention relates to a preparation method of fluorine-free antifouling bio-based polyurea coating resin with high wear resistance, and belongs to the technical field of high polymer materials. According to the method, polydimethylsiloxane (PDMS) is locked in a polyurea matrix through an interpenetrating network polymerization (IPN) technology, and the environment-friendly coating is prepared by combining a bio-based raw material castor oil (CO) and benzene-free isocyanate. The preparation method comprises the specific steps of prepolymer preparation, mixing of polyaspartic acid ester and PDMS, vacuum defoaming and curing forming. The obtained coating does not contain fluorine compounds and volatile organic solvents (VOCs), and has high hydrophobicity (the water contact angle is larger than or equal to 105 degrees), wear resistance (the Taber wear index is smaller than or equal to 0.1558) and excellent mechanical performance (the tensile strength is 16.64-20.69 MPa). By adjusting the content of PDMS (X value is 10-25%), the hardness (69D-77D), surface energy (26.0-27.8 mJ.m <-2 >) and other properties of the coating can be regulated and controlled, and the coating is suitable for antifouling scenes such as building walls and industrial equipment, and has remarkable environmental protection advantages and application prospects.

The invention discloses a high-strength moisture-proof gypsum board and a preparation method thereof, and relates to the technical field of gypsum board preparation. The high-strength moisture-proof gypsum board is prepared by dipping the surface paper in the composite dipping liquid and then pouring the surface paper and the gypsum core with the waterproof agent, the composite dipping liquid comprises the methoxy vinyl ether copolymer and the epoxy polyoxymethylene dimethyl ether, and the methoxy vinyl ether copolymer is 2, 3, 5-trimethyl-1, 3-pentanediol monoisobutyrate. According to the present invention, epoxy polyoxymethylene dimethyl ether is prepared by reacting 2, 4-dimethoxymethoxyphenylacetic acid with 2-hydroxyethyl vinyl ether, and the epoxy polyoxymethylene dimethyl ether is prepared by terminating polyoxymethylene dimethyl ether with allyl and then reacting with phthalimide hexperoxy acid, such that the waterproofness and the mechanical property of the gypsum board are improved; the waterproof agent is prepared by reacting hydrogen-containing silicone oil and fluorine-containing hyperbranched amide polyurea urethane, so that the moisture resistance and bonding strength of the gypsum board surface paper are enhanced, and additional mechanical support is provided for the gypsum board.

Provided is a thermoplastic polyurea that has a number average molecular weight of from more than 5,000 to 50,000, and the number average molecular weight and the amine value satisfy formula (1). Formula (1): 2.0≤(number average molecular weight×amine value [μmol / g] / 106≤4.0

The invention discloses an aluminum substrate UV matt finish paint and a preparation process thereof, and relates to the technical field of paints.The aluminum substrate UV matt finish paint is prepared from, by mass, 10%-20% of modified polyurethane acrylate, 25%-32% of high-functionality aliphatic polyurethane acrylate, 18%-30% of special modified epoxy acrylate resin, 0.5%-2% of dispersing agent, 0.1%-0.5% of defoaming agent, 1%-3% of anti-settling powder and the balance water. The paint is prepared from the following components in percentage by weight: 10 to 15 percent of magnesium silicate mineral, 1 to 10 percent of matting powder, 0.2 to 1 percent of 1-hydroxycyclohexyl phenyl ketone, 0.5 to 3 percent of trimethylbenzoyl-diphenyl phosphine oxide, 1 to 3 percent of acrylate flatting agent, 0.2 to 1.2 percent of polyurea modified polyurethane rheological agent and 5 to 15 percent of trimethylolpropane triacrylate. According to the UV matte finishing paint disclosed by the invention, through compounding of ternary resin and enhancement of nano silicon dioxide, a rigid and tough cross-linked network is constructed, a paint film is free of cracks when being bent at 180 degrees, the adhesive force reaches grade 0, and a coating is resistant to acid and alkali etching liquid and free of corrosion by cooperating with a silane coupling agent and a light stabilization system, and the color difference is delta Elt after the UV matte finishing paint is subjected to high temperature of 260 DEG C; and 1.5, the anti-yellowing performance is excellent.

The invention relates to the field of petroleum and natural gas extraction, and discloses a self-adaptive temporary plugging agent for plugging irregular holes and a preparation method and application thereof. The temporary plugging agent comprises a flexible material and a ductile material layer wrapping the flexible material. Wherein the tough material layer is made of polyurea, and the thickness of the tough material layer is larger than or equal to 0.5 mm. The temporary plugging agent is of a double-layer structure which is soft inside and tough outside, the inner layer is made of a flexible material and can deform easily, the outer layer is made of a tough material, the bottom hole pressure is within the compressive strength of the temporary plugging agent, and a tough material wrapping layer can deform sufficiently along with the flexible material of the inner layer and cannot be damaged.

The invention belongs to the technical field of functional finishing of textiles, and particularly relates to microcapsule emulsion with a pH indicating function, preparation of the microcapsule emulsion and application of the microcapsule emulsion in a textile finishing agent. The invention provides a preparation method of a microcapsule emulsion with a pH indication function, which comprises the following steps: reacting isocyanate with polyol to obtain a polyurethane prepolymer, mixing and dissolving the polyurethane prepolymer with a pH indicator solution, an acrylate monomer and an initiator to obtain an oil phase, and taking an aqueous solution of a polymer emulsifier as a water phase; then mixing and emulsifying the oil phase and the water phase, adding a chain extender, heating to carry out chain extension reaction, cross-linking to a certain degree to form a polyurethane-polyurea-polyacrylate hybrid shell layer on an oil-water interface, and coating a core material pH indicator to obtain the microcapsule emulsion with the pH indication function. According to the invention, the pH indicator is coated in the form of microcapsules for the first time, and industrial production and processing can be carried out.

The invention relates to a preparation method and an application method of a corrosion inhibitor intercalated LDH / MoS2 synergistically enhanced corrosion-resistant polyurea coating. The preparation method comprises the following steps: preparing corrosion inhibitor intercalated LDH by adopting a hydrothermal method; preparing a corrosion inhibitor intercalation LDH / MoS2 heterostructure by combining a hydrothermal method with an in-situ growth mode; preparing a polyurea matrix; and mixing the corrosion inhibitor intercalation LDH / MoS2 heterostructure into the polyurea matrix, and carrying out dispersing and defoaming treatment on the corrosion inhibitor intercalation LDH / MoS2 heterostructure. According to the preparation method, a corrosion inhibitor intercalation LDH / MoS2 heterostructure composite filler is constructed in situ in a polyurea matrix, efficient synergy of an active protection mechanism and a passive physical barrier is achieved, high compatibility of a filler system and the polyurea matrix is ensured, and finally the polyurea composite coating with excellent long-acting corrosion resistance and excellent comprehensive performance is obtained. And the long-acting protection requirement in an extremely severe environment is met.

The invention provides a diaphragm and a preparation method thereof, and a lithium ion battery, the diaphragm comprises a base membrane, a composite ceramic coating and an interface layer, the composite ceramic coating contains inorganic ceramic particles and organic microcapsule particles, the organic microcapsule particles comprise a core material with a melting point range of 55-65 DEG C and a polymer shell coating the surface of the core material, and the polymer shell is coated on the surface of the core material. The polymer shell is selected from at least one of polyurethane, polyurea, polyamide and polycarbonate, the interface layer is formed by depositing an interface modification polymer on the surface of the composite ceramic coating, and the interface modification polymer is selected from at least one of polycatechol derivatives, polyaniline, polyvinyl pyridine, polyacrylic acid and polyacrylamide. The core material in the organic microcapsule particles is melted when heated to trigger hole closing at the initial stage of thermal runaway at 60-80 DEG C, the hole closing rate can reach 92%, the hole closing response time is shortened by 30%, and the porous structure of the interface layer can enhance the liquid absorption rate.

The invention relates to the technical field of preparation of viscose fibers, in particular to a preparation method of viscose fibers based on wormwood essential oil / paraffin double-layer microcapsules, which comprises the following preparation steps: S1, preparing the wormwood essential oil / paraffin double-layer microcapsules; s2, preparing a microcapsule spinning solution; s3, spinning and forming. According to the invention, the wormwood essential oil is coated in the double-layer microcapsule, so that the natural antibacterial property of the wormwood essential oil is fully exerted. Main active components (such as eucalyptol and flavonoid compounds) of the wormwood essential oil are continuously released through a microcapsule slow release mechanism, and growth of common pathogenic bacteria such as escherichia coli and staphylococcus aureus is remarkably inhibited. Meanwhile, due to the double-layer structure (the polyurethane inner shell and the polyurea outer shell) of the microcapsule, volatilization and oxidation of the wormwood essential oil in the spinning process are effectively avoided, and the long-acting antibacterial effect is ensured.

The invention relates to the technical field of cables, and discloses an anti-ultraviolet outdoor cold-resistant power cable adapting to day and night temperature difference. The device is provided with the polyurea sealing micro-capsules, the hexagonal cells, the micro-capsule elastic pieces and the stretching structures, in a low-temperature environment, the polyurea sealing micro-capsules contract, at the moment, the micro-capsule elastic pieces lose supporting force and begin to release elastic potential energy, the hexagonal cells deform and begin to expand outwards, and when the hexagonal cells expand outwards, the trough positions of the stretching structures are pushed to expand outwards; the stretching structure is gradually stretched into a cylindrical outline from a corrugated shape, under the external expansion action of the hexagonal cells and the stretching structure, the cable sheath layer is promoted to actively expand to offset shrinkage stress, the problem of low-temperature embrittlement is effectively avoided, meanwhile, the design of the corrugated structure is used for coping with axial shrinkage of the cable sheath layer, and the tensile strength of the cable sheath layer is improved. The cable is divided into a plurality of independent units by the cable separation rings, the overall axial shrinkage is decomposed into local small-amplitude shrinkage of each unit, and cable distortion and cable insulation layer cracking caused by shrinkage stress accumulation are avoided.

The invention belongs to the technical field of vehicle protection materials, and particularly relates to a coating for an explosion-proof vehicle. The coating is composed of an adhesion bottom layer, an energy-absorbing middle layer and an anti-impact outer layer, wherein the adhesion bottom layer contains epoxy resin and flaky zinc powder / mica powder, and a laminated shielding structure is formed to improve the adhesion force to be larger than or equal to 8 MPa; the energy-absorbing middle layer is a composite material of modified nano silicon dioxide / polyethylene glycol-based STF and silanized aramid fiber, the viscosity of the energy-absorbing middle layer is sharply increased by more than 50 times at the strain rate of 500s <-1 >, and 65% of explosion impact energy can be absorbed; the anti-impact outer layer adopts a polyurea elastomer to wrap gradient distribution silicon carbide microspheres, pyramid-shaped protrusions are designed on the surface, the fragment defense speed reaches 430 m / s, and the shock wave reflection dispersion is increased by 50%. The whole anti-explosion coating passes UL94V-0 certification through a synergistic flame-retardant system, the chemical protection and self-cleaning capacity is improved through a super-hydrophobic surface layer, and the problems that a traditional anti-explosion coating is poor in adhesive force, weak in composite threat resistance and insufficient in environmental adaptability are solved.

The invention belongs to the technical field of repairing refrigeration spraying materials, and particularly discloses a daytime passive radiation refrigeration polyurea composite spraying material with a structure repairing function and a preparation method of the daytime passive radiation refrigeration polyurea composite spraying material. And preparing the spraying material with certain flowability. The porous composite polyurea repairing radiation refrigeration spraying material is synthesized by utilizing the multi-graded micron hollow glass beads, has a multi-stage pore structure, and can optimize the pore size grading, so that the spraying material has high daytime radiation refrigeration power and excellent structure repairing capability at the same time.

The invention relates to the technical field of bearing lubricating grease, and particularly discloses a high-temperature-resistant lubricant composition and a preparation method thereof. The high-temperature-resistant lubricant composition comprises the following raw materials in parts by weight: 90-110 parts of base oil, 30-35 parts of a thickening agent, 2-3.5 parts of modified nanoparticles, 0.5-1.5 parts of an antioxidant, 1-3 parts of an antirust agent and 0.5-1 part of a friction modifier, the thickening agent comprises polyethylene glycol, modified polyurea lubricating grease and a surfactant according to a mass ratio of 1: (0.3-0.5): (0.1-0.15); the modified nano particles are brominated-1-hexadecyl-3-methylimidazolyl ionic liquid modified nano particles, and the nano particles comprise carbon nano particles and nano tungsten disulfide in a mass ratio of (2-3): 1. The lubricating grease composition provided by the invention has the advantages of good nanoparticle dispersibility, strong high temperature resistance, and excellent oxidation stability and antifriction and antiwear properties.

The invention discloses an underground gas storage steel lining anticorrosive coating and a preparation method thereof, and belongs to the technical field of underground gas storage. The coating sequentially comprises a protective layer, a buffer layer, an impermeable layer and a wear-resistant layer from the surface of a steel lining to the outside; the protective layer is epoxy zinc-rich primer dispersed with microcapsules, each microcapsule comprises a shell layer and a core material wrapped by the shell layer, and the core material is composed of a corrosion inhibitor, a repairing agent and a surface modifier; the buffer layer is made of a polyurea elastomer, and the impermeable layer is made of a fluorocarbon resin / silanized graphene composite material; and the wear-resistant layer is made of an epoxy-organic silicon hybrid resin material reinforced by a SiC / Al2O3 composite filler. The anticorrosive coating for the steel lining of the underground gas storage has a self-repairing function, coating cracking caused by deformation of a base material can be avoided, the comprehensive anticorrosive performance is high, and the requirement for the high-pressure, high-humidity, high-low-temperature and dynamic-load composite environment is met.

The invention provides a method 100 for separating different polymeric spectacle lens materials in a mixture comprising at least two different polymeric spectacle lens materials by separating at least one polymeric spectacle lens material of the at least two different polymeric spectacle lens materials by using their different physical behavior and / or chemical behavior, wherein the at least two different polymeric spectacle lens materials are selected from the group consisting of polyallyl carbonate, polyurea, polyurethane, polyurethane / polyurea, polycarbonate, polyepisulfide and polythiourethane. The invention further provides a method for separating at least one polythiourethane from a mixture comprising at least two different polythiourethanes by thiolysis.

The invention belongs to the technical field of intelligent traffic, and provides a distributed optical fiber road sensor on-site manufacturing and road risk monitoring and early warning method. Comprising the steps of optical fiber unit manufacturing, concave shallow slot cutting, sensor construction, data acquisition, road surface state data conversion, scattered light time domain signal interval division, frequency domain conversion and filtering processing, multi-mode feature extraction and road surface condition recognition. According to the invention, the concave shallow slot is cut at the edge of the road, and the flat ribbon-shaped optical fiber unit is fixed in the shallow slot by using polyurea, so that the multifunctional distributed optical fiber road sensor which is integrated with the road surface, high in sensitivity, small in size, simple to install, convenient and rapid to maintain and repair and low in cost is constructed; through a zero crossing point and a noise threshold value, normal time domain signal interval judgment is optimized, and the effect of subsequent filtering processing is improved; a road surface condition identification data model is constructed through a multi-modal fusion technology, and the identification precision of multiple road surface abnormal conditions and the positioning precision of abnormal events are improved.

The invention discloses a double-shell-layer fire extinguishing microcapsule. The double-shell-layer fire extinguishing microcapsule comprises a core material, a first shell layer and a second shell layer, wherein the core material is coated with the first shell layer, and the first shell layer is coated with the second shell layer. By optimizing the components of the core material, reducing the volatility of the core material, improving the coating rate and arranging the double-layer microcapsule structure, the first shell layer can be formed under the low-temperature condition and is excellent in compactness, escape of the core material in the reaction can be effectively reduced, the coating rate and the yield of the microcapsule are further improved, and after full crosslinking, the product yield is improved. The second shell layer can further improve the mechanical performance of the microcapsule, the hydrophobicity and compactness of the second shell layer are beneficial for preventing polyurea and melamine resin from absorbing water and deliquescing and preventing formaldehyde harmful substances from being continuously released, the safety of the microcapsule is improved, and the microcapsule has a wider application scene and can quickly respond to the fire temperature.

An aqueous pretreatment liquid for inkjet printing comprises resin particles having an average diameter of 1 [mu] m or less and comprising a first polymer and a second polymer, and a fixing agent, the first polymer is a polymer selected from the group consisting of polyureas, polyurethanes, polyamides, polyesters, polycarbonates, polysulfonamides, polyamides, polysulfonamides, melamine-based polymers, silica-based sol-gel polymers, and combinations thereof, and the second polymer is a polyoxyalkylene graft polymer obtained by polycondensation or addition polymerization, the polyoxyalkylene graft has a number average chain length of 20 or more oxyalkylene units. The pre-treatment liquid is useful for inkjet printing on packaging materials such as cardboard or corrugated cardboard.

The invention discloses a chlorine salt corrosion resistant prestressed concrete solid square pile and a construction method thereof, a cementing material of a pile body concrete body of the square pile comprises a mineral admixture accounting for 50%-70% of the total mass of the cementing material, and the cementing material adopts Portland cement; sacrificial anode blocks electrically connected with the main reinforcements are embedded in the pile body concrete body. The pile body concrete body is doped with a composite corrosion-resistant and rust-resistant agent; the outer surface of the pile body concrete body is coated with polyurea waterproof paint or epoxy seal primer. An electromigration type corrosion inhibitor and a microcapsule containing bacillus are doped into the pile body concrete body; the prestressed main reinforcements are steel reinforcements with anti-corrosion coatings; and fiber bragg grating sensors are pre-embedded around the prestressed main reinforcements. The mixing proportion of the concrete body of the pile body is specially designed for fixing and blocking chloride ions, an inapplicable sulfate-resistant cement scheme is abandoned, and the chlorine salt resistance is improved from the source of materials.

The invention relates to the technical field of plastics, and provides a phenolic moulding plastic and a preparation method thereof, the phenolic moulding plastic comprises the following components by weight: 30-50 parts of phenolic resin, 4-7 parts of a curing agent and 3-6 parts of composite fiber; wherein the composite fibers are glass fibers coated with polyurea nanofibers on the surfaces. The polyurea nanofibers are coated on the surfaces of the glass fibers to obtain the composite fibers, good physical and chemical properties of the glass fibers are reserved, meanwhile, the polyurea nanofibers are coated on the surfaces of the glass fibers to form a protective layer, so that the properties of the phenolic moulding plastic can be enhanced, and the polyurea nanofibers are coated on the surfaces of the glass fibers to form a protective layer. The interface adaptability of the glass fiber and the phenolic resin can be optimized, and effective stress transfer can be formed between the composite fiber and the phenolic resin through good interface bonding, so that the strength of the phenolic molding plastic can be improved.

The invention relates to the technical field of membrane separation and water treatment, in particular to an anti-pollution polyurea composite reverse osmosis membrane as well as a preparation method and application thereof. According to the preparation method, a polyamine monomer of a water phase solution and an aromatic polyisocyanate monomer of an organic phase solution are used for constructing a polymerization reaction system to form a urea bond structure, and terminal sealing treatment is cooperatively performed on a polyurea selection layer, so that the compact, flat and hydrophilic polyurea selection layer can be prepared. And the preparation method is simple, mild in condition, low in energy consumption, robust in process, wide in parameter window and suitable for large-scale production. The prepared anti-pollution polyurea composite reverse osmosis membrane has excellent anti-pollution performance and separation performance, can achieve excellent balance between maintenance of initial flux and long-term stability, and has excellent anti-pollution performance and separation performance. The reverse osmosis membrane shows low irreversible pollution rate and good cleaning recoverability to organic / inorganic typical sewage plugging substances, can well meet industrial requirements, and has a good application prospect.

The invention relates to the technical field of polymer composite materials, in particular to an explosion-proof and impact-resistant polymer coating material for an aircraft shell. The coating is prepared from aliphatic polyurethane acrylate, cycloaliphatic epoxy resin, nano silicon dioxide, polyethylene glycol, polyurea microcapsules, dicyclopentadiene resin, a Grubb catalyst, graphene oxide, polysulfide rubber and the balance of auxiliary materials. According to the invention, aliphatic polyurethane acrylate is used as a flexible matrix, so that the risk of hydrolysis of aromatic isocyanate is avoided. The dicyclopentadiene resin is subjected to in-situ ring opening polymerization in the presence of a Grubbs catalyst and cooperates with the hydrophobic nano silicon dioxide to block water. The polyurea microcapsules are broken by impact to release silicone oil, and cracks are filled immediately to reduce friction. And a water molecule permeation path is prolonged by the mica powder sheet layer. And the epoxy-polyurethane network realizes micro-crack self-repairing through dynamic ester bond exchange, so that the anti-explosion and anti-impact functions of the coating and the structural stability of an aircraft shell in an extreme environment are guaranteed.

The invention relates to the technical field of anti-corrosion coatings, in particular to a composite anti-corrosion coating for a medium heavy-duty anti-corrosion environment and a preparation method of the composite anti-corrosion coating. According to the technical scheme, the composite anti-corrosion coating for the medium heavy anti-corrosion environment comprises the following components in percentage by mass: a bottom coating component, a middle transition layer component and a surface coating component, and the mass ratio of the bottom coating component to the middle transition layer component to the surface coating component is 33: 17: 50; the durability is improved through multi-dimensional material innovation, a fluorocarbon resin modified waterborne epoxy system is adopted for the bottom coating, and a nano graphene directional arrangement technology is combined, so that a labyrinth effect is formed, and a corrosion medium is blocked; a solvent-free polyurea and microcapsule self-repairing system is introduced into the surface coating, so that automatic repairing after damage is realized; the middle transition layer enhances the interlayer barrier function through the oriented graphene composite material, and the three layers cooperate to construct a compact protection network, so that the medium permeation path is obviously delayed, and the full-life-cycle maintenance cost is greatly reduced.