114results about How to "Improve interfacial adhesion" patented technology

The invention provides a high-temperature-resistant carbon fiber reinforced phenolic resin composite material and a preparation method thereof. The preparation method comprises the following steps: firstly, carrying out high-temperature oxidation treatment on carbon fibers; secondly, carrying out surface modification on the carbon fibers by using a chemical modifier; then mixing the modified carbon fiber, an antioxidant and a dispersing agent to prepare slurry; performing vacuum filtration on the prepared slurry, and drying to obtain a carbon fiber blank; preparing a phenolic resin infiltration solution, and impregnating the carbon fiber blank with the phenolic resin infiltration solution; and finally, carrying out mold pressing and curing to obtain the high-temperature-resistant carbon fiber reinforced phenolic resin composite The preparation method is simple in required equipment, convenient to operate, stable in process, high in production efficiency and suitable for large-scale industrial production. According to the high-temperature-resistant carbon fiber reinforced phenolic resin composite material prepared by the preparation method, the bonding property between the carbon fiber and the phenolic resin is improved, certain toughness and strength are provided, and meanwhile, the high-temperature-resistant carbon fiber reinforced phenolic resin composite material has the advantages of ablation resistance, good oxidation resistance in a high-temperature environment and the like.

The invention relates to the technical field of composite materials, in particular to fiber sizing liquid, a polyether-ether-ketone composite material and a preparation method of the polyether-ether-ketone composite material, and the fiber sizing liquid comprises low-molecular-weight polyaryletherketone containing imide side groups, carbon nanotubes and the like; the composite material is obtained by carrying out heat treatment on fibers, re-sizing the fibers by adopting the sizing liquid, and then carrying out melt extrusion on the fibers and polyether-ether-ketone. The sizing liquid provided by the invention can effectively improve the compatibility between fibers and PEEK, so that the mechanical properties of the composite material are obviously improved.

The invention relates to the technical field of cement-based anticorrosive materials, and particularly discloses a modified magnesium phosphate cement anticorrosive material as well as a use method and application thereof. The anticorrosive material comprises the following components in parts by weight: 100 parts of modified magnesium phosphate cement, 3-15 parts of a retarder, 1-10 parts of an epoxy resin glue solution, 0.5-5 parts of metakaolin and 15-20 parts of water. The modified magnesium phosphate cement comprises dead burned magnesium oxide and modified phosphate in a mass ratio of (1-4): 1. The modified phosphate is prepared from the following raw materials: nano aluminum oxide, sodium citrate and phosphate in a mass ratio of (0.5-1.5): (0.5-1.5): (20-25). The epoxy resin glue solution comprises uncured epoxy resin glue and a curing agent. The anti-corrosion material provided by the invention has the technical advantages of strong adhesive property and excellent anti-corrosion property, and can better provide protection for a steel structure serving in a marine environment.

The invention provides an electric heating fabric and a preparation method and application thereof.The electric heating fabric comprises fiber cloth, an electric heating film is arranged on the surface of one side or two sides of the fiber cloth, the electric heating film has a wave-transparent function and is formed by curing conductive slurry, and the conductive slurry comprises resin, a dispersing agent, a carbon material, a functional compound and a solvent; the functional compound comprises a nitrogen-containing compound and / or an acidic compound; the specific functional compound is added into the preparation raw materials of the electric heating film, and the interface bonding performance between the electric heating film and the composite material is effectively improved by utilizing the cross-linking reaction between the functional compound and the resin in the composite material; therefore, the long-term stability and reliability of the obtained electric heating fabric and the integrated composite material thereof in an extreme use environment can be ensured, and the electric heating fabric has a wave-transparent function and is suitable for being applied to the surface of an aircraft.

The invention discloses low-carbon flow-state solidified soil for a seasonal frozen region. The low-carbon flow-state solidified soil comprises soil, a curing agent and water, the dosage of the curing agent is 15-20% of the mass of the dry soil; the water content is 40-60% of the dry mass of the soil and the curing agent; the soil comprises sludge and building residue soil, and the sludge accounts for 20-40 parts by weight, and the building residue soil accounts for 60-80 parts by weight; the curing agent is prepared from the following components in parts by weight: 40 to 60 parts of phosphogypsum, 10 to 15 parts of mixing plant waste slurry, 20 to 40 parts of steel slag, 5 to 10 parts of quick lime, 0.5 to 1.2 parts of glycerol, 0.2 to 0.6 part of hydroxypropyl methyl cellulose and 1 to 1.5 parts of water reducing agent; according to the invention, various technical problems of insufficient anti-freezing performance, unstable fluidity, long setting time, insufficient early strength, large shrinkage deformation, easy generation of segregation and bleeding and the like of the existing fluid-state solidified soil are solved, and meanwhile, more low-carbon environment-friendly raw materials are introduced, so that multi-aspect improvement of the performance of the fluid-state solidified soil and maximization of environment-friendly benefits are realized; and a more reliable and efficient solution is provided for earthwork such as foundation pit backfilling.

The invention provides a lightweight insulation composite cross arm. The lightweight insulation composite cross arm comprises an insulation core rod, a filler filled in the insulation core rod and an insulation umbrella skirt located outside the insulation core rod, the structure of the insulating core rod is a pipe body formed by modified continuous basalt fibers which are spirally arranged in multiple layers, and resin is adhered to the surfaces of the modified continuous basalt fibers; the structure of the modified continuous basalt fiber is as follows: basalt fiber chips are connected to the surface of the continuous basalt fiber through silica sol; the resin comprises the following raw materials: 100 parts of epoxy resin, 1-5 parts of a silane coupling agent, 5-8 parts of an auxiliary agent, 8-10 parts of basalt fiber chippings, 20-30 parts of a curing agent and 30-50 parts of a solvent. According to the invention, the continuous basalt fibers are modified by the basalt chips, and the basalt chips are used as a bridge, so that the interaction between the continuous basalt fibers and a resin matrix is increased, and the bending modulus and bending strength of the insulating core rod are improved.

The invention discloses green low-carbon high-rutting-resistance asphalt concrete and a preparation method thereof, and relates to the technical field of asphalt concrete. The technical scheme is as follows: RAP accounts for 30-40% of the mass of a new aggregate, 53-65 parts of the new aggregate, 3.2-4.1 parts of new asphalt, 4-6 parts of mineral powder, 0.3-0.4 part of high-density oxidized polyolefin, 0.05-0.1 part of a drying agent, 0.05-0.1 part of a lead salt stabilizer, 0.05-0.1 part of an auxiliary agent, 1.5-3 parts of reactive polyurethane, 3-6 parts of a polyester modifier, 0.5-2 parts of a silane coupling agent, 0.1-0.5 part of an antioxidant and 0.5-2 parts of a dispersing agent. Through the synergistic effect of high-density oxidized polyolefin and reactive polyurethane, the performance of aged asphalt in RAP is improved, the rutting resistance of asphalt concrete is improved, VOC emission is reduced, the sustainability of the material is enhanced, the long-term durability is improved, and the service life of a road is prolonged.

The invention provides a solid air entraining agent suitable for a plateau low-pressure area as well as a preparation method and application of the solid air entraining agent. The preparation method of the solid air entraining agent suitable for the plateau low-pressure area comprises the following steps: (1) cleaning the rubber powder aggregate; (2) uniformly mixing the rubber powder aggregate with carbon nanotubes and nano zinc oxide to obtain a solid mixture; (3) mixing the solid mixture with a modified solution to obtain a mixture; (4) performing ultrasonic treatment on the mixture, and performing mechanical stirring, solid-liquid separation and drying after ultrasonic treatment to obtain modified rubber powder aggregate; and (5) carrying out heat treatment on the modified rubber powder aggregate to obtain the solid air entraining agent suitable for the plateau low-pressure area. When the solid air entraining agent suitable for the plateau low-pressure area is applied to concrete, the concrete can have excellent anti-freezing performance, the service life of a concrete structure in the plateau low-pressure area can be remarkably prolonged, and the maintenance cost can be reduced.

The invention relates to the technical field of building materials, and discloses an ardealite-based cementing material and a preparation method thereof, and the ardealite-based cementing material comprises the following component materials: 70-90% of ardealite; 1%-15% of waste slag; 3%-10% of fly ash; 1%-10% of a nano modifier; the ardealite is pretreated, so that the moisture content of the ardealite is less than or equal to 5%, the particle size distribution of the ardealite is adjusted to be 3-5 [mu] m in a D90 range, and the nano modifier comprises but is not limited to a silane coupling agent, graphene oxide nano particles and a composition of the silane coupling agent and the graphene oxide nano particles. The ardealite, the waste slag, the fly ash and other industrial wastes are used as main raw materials, so that efficient resource utilization of solid wastes is realized, the problems of environmental pollution and land occupation caused by solid waste stockpiling are reduced, the requirements of circular economy and sustainable development are responded, and meanwhile, the preparation process of the material is low in energy consumption, less in pollution and suitable for industrial production. And a low-carbon and environment-friendly solution is provided for the building industry.

The invention provides composite aramid paper and a preparation method thereof. The preparation method comprises the following steps: preparation of a heterocyclic aramid stock solution: mixing p-phenylenediamine, a diamine monomer containing a heterocyclic structure and terephthaloyl chloride in a solvent for polymerization to obtain the heterocyclic aramid stock solution; preparing heterocyclic aramid nanofibers: diluting the heterocyclic aramid stock solution with a solvent, mixing the diluted heterocyclic aramid stock solution with a poor solvent, stirring, shearing, dispersing, and cleaning to obtain the heterocyclic aramid nanofibers; preparation of mixed slurry: mixing and pulping para-aramid and the heterocyclic aramid nanofiber to obtain the mixed slurry; and papermaking of the composite aramid paper: performing papermaking on the mixed pulp to obtain the composite aramid paper. And papermaking of the composite aramid paper: performing papermaking on the mixed pulp to obtain the composite aramid paper. According to the method, the heterocyclic aramid nanofiber is introduced into the para-aramid paper, so that the interface bonding problem of the para-aramid paper can be improved, and the internal bonding strength, the mechanical property and the electrical insulating property of the para-aramid paper are improved.

The invention discloses a fiber reinforced composite material with a strain-damage self-sensing function and a preparation method of the fiber reinforced composite material. The fiber reinforced composite material comprises the following components: 0.1-0.5 part of dopamine; 0.1 to 1 part of a hydroxylated multi-walled carbon nanotube; 3-5 parts of nano titanium dioxide; 20 to 60 parts of acetone; 20 to 80 parts of absolute ethyl alcohol; 80 to 120 parts of deionized water; 1-10 parts of polyethylene glycol; 0.1 to 2 parts of ammonia water; 0.1 to 1 part of polyvinylpyrrolidone; 1-3 parts of a silane coupling agent; 60-80 parts of unidirectional fiber cloth; 1 to 5 parts of polycaprolactone (PCL); according to the preparation method disclosed by the invention, the service life of the resin-based composite material can be prolonged, the material is endowed with intelligent self-sensing and self-healing functionalization, and meanwhile, the fiber-reinforced composite material can sense the occurrence and development of damage through resistance change by utilizing the high electric conduction and heat conduction characteristics of the multi-walled carbon nanotubes; the damage is monitored in real time, the relation between the damage and the resistance change can be deeply understood, and the maintenance period is shortened.

The invention discloses a polyvinylidene fluoride based dielectric composite material which comprises a polyvinylidene fluoride based polymer, a thermotropic liquid crystal polymer, modified molybdenum disulfide and maleic anhydride grafted modified polypropylene, and the thermotropic liquid crystal polymer comprises at least one of Xydar, Vectra, Ueno and Rodrn. According to the polyvinylidene fluoride-based dielectric composite material disclosed by the invention, the thermotropic liquid crystal polymer is introduced into the composite material and acts together with the polyvinylidene fluoride-based polymer, the maleic anhydride grafted modified polypropylene and the modified molybdenum disulfide in the composite material, so that the tensile strength and the processability of the composite material are improved; and the dielectric constant and dielectric strength of the composite material are improved, and the dielectric loss is reduced.

The invention discloses high-strength heat-resistant green concrete and a preparation method thereof, and the high-strength heat-resistant green concrete comprises the following raw materials by weight: 600-750 parts of cement; 1000 to 1250 parts of sand; 1300 to 1450 parts of broken stone; 130 to 150 parts of fly ash; 65 to 85 parts of silica fume; 180 to 200 parts of water; 27-35 parts of a water reducing agent; 26 to 33 parts of an exciting agent; 6-10 parts of a defoaming agent; 21-29 parts of a shrinkage reducing agent; 20 to 28 parts of steel fiber; 30 to 50 parts of titanate coupling agent modified glass beads; and 45-75 parts of graphene modified potassium titanate whiskers. The high-strength heat-resistant green concrete provided by the invention has the advantages of high compressive strength, good heat resistance and better anti-cracking effect.

The invention discloses a molecular sieve-based flame-retardant material and a preparation method thereof, the molecular sieve-based flame-retardant material comprises a hollow molecular sieve and a flame retardant, the hollow molecular sieve is a hollow structure with micropores, and the flame retardant is coated or embedded in the micropores and the hollow structure of the hollow molecular sieve and / or the crystal surface of the hollow molecular sieve; the preparation method comprises the following steps: C1, introducing a flame retardant into the hollow molecular sieve through a dipping or dissolving method, so that the flame retardant is partially adsorbed in micropores and / or on the surface of the hollow molecular sieve; c2, mixing a hollow molecular sieve containing a flame retardant with the crystallization solution, and carrying out a hydrothermal heavy crystallization reaction at 120-180 DEG C; c3, after the re-crystallization reaction is finished, separating the sample in a filtering or centrifuging manner, cleaning the sample with deionized water, and removing an unreacted crystallization solution; and C4, drying the sample separated in the step C3 to obtain the molecular sieve-based flame-retardant material. The heat stability and the flame-retardant effect are improved.

This invention provides an antistatic and privacy-protecting polarizing film and its preparation process, belonging to the field of polarizing film preparation technology. The preparation process includes the following steps: preparation of an antistatic agent; preparation of a modified adhesive; preparation of a composite polarizing film; and preparation of the polarizing film. This invention introduces an antistatic agent and POSS-modified graphene oxide into the modified adhesive, making the adhesive layer a conductive medium connecting multiple layers such as the polarizing film (PVA), TAC layer, and privacy film, forming a cross-layer conductive path. This avoids static electricity accumulation at the interface, improving the antistatic effect. Boric acid is first used to crosslink the PVA film, followed by glyoxal crosslinking, achieving long-term reliability of the polarizing film under high temperature and high humidity environments.

The invention discloses a PLA (polylactic acid) laminated composite material as well as a preparation method and application thereof, and belongs to the technical field of laminated paper. 20 to 30 parts of a bio-based toughening component; 15 to 25 parts of cationized filler; 2-4 parts of a heat-resistant compatilizer; 1 part of a nucleating agent TMC-300; the heat-resistant compatibilizer is a terpolymer formed by norbornene imide, 1, 6-hexanediol diacrylate and glycidyl methacrylate, according to the PLA lamination composite material provided by the invention, through the synergistic effect of the heat-resistant compatibilizer and the cationization filler, an organic-inorganic dual-reinforcement system is constructed, the material body performance is enhanced, the heat-resistant compatibilizer and the cationization filler are combined, and the heat-resistant compatibilizer and the cationization filler are combined, so that the heat-resistant compatibilizer and the cationization filler are combined, and the heat-resistant compatibilizer and the cationization filler are combined. And the interface bonding strength of the lamination layer and the paper is improved, and finally, the full-biodegradable lamination material with high heat resistance, excellent flexibility and firm interlayer bonding force is prepared and is suitable for preparing heat-resistant lamination paper products.

The invention provides a modified epoxy resin water permeable brick and a preparation method thereof. The modified epoxy resin water permeable brick is prepared from the following raw materials in parts by weight: 95 to 105 parts of aggregate, 8 to 15 parts of modified epoxy resin, 1 to 3 parts of curing agent, 5 to 8 parts of composite filler, 0.1 to 0.3 part of exciting agent, 2 to 4 parts of self-repairing component and 1 to 3 parts of diluent. According to the water permeable brick, through the synergistic effect of the organic silicon modified epoxy resin and the special curing agent, the anti-aging performance of the material is improved. The introduced Si-O-Si bond can effectively resist the attack of ultraviolet photons; long-chain alkyl in the curing agent forms a compact physical barrier layer, so that oxygen and moisture permeation is greatly slowed down, the water permeable brick can effectively resist pulverization, yellowing and embrittlement in long-term outdoor use, the compressive strength and the water permeability coefficient of the water permeable brick can still keep an extremely high retention rate after long-term use, the service life is remarkably prolonged, and the water permeable brick is suitable for popularization and application. The industrial pain point that a traditional resin-based water permeable brick is easy to age is solved.

The present invention belongs to the technical field of polyurethane elastomers, and more particularly to a highly conductive thermoplastic polyurethane elastomer and a preparation method thereof. By weight, the raw materials for preparing the highly conductive thermoplastic polyurethane elastomer include the following components: 15-70 parts of diisocyanate, 30-80 parts of polyol, 3-18 parts of chain extender, 1-40 parts of metal oxide in-situ modified carbon nanofibers, 0.5-5 parts of catalysts, and 1-7 parts of other additives. The present invention introduces metal oxides in-situ into carbon nanofibers to synergistically improve the conductivity of the material. In addition, the nanofibers obtained by electrostatic spinning technology have excellent specific surface area, mechanical properties, and good interfacial adhesion with a polymer matrix, which can significantly improve the mechanical properties of the polymer.

The application discloses an ultrahigh-molecular-weight polyethylene silicon nano wear-resistant composite pipe and a preparation method thereof, and relates to the technical field of ultrahigh-molecular-weight polyethylene composite pipes. The ultrahigh-molecular-weight polyethylene silicon nano wear-resistant composite pipe is prepared from the following raw materials in parts by mass: 70-85 parts of ultrahigh-molecular-weight polyethylene, 5-15 parts of silicon nano particles, 3-6 parts of maleic anhydride grafted polyethylene, 0.1-1.2 parts of a silane coupling agent, 1-3 parts of a wear-resistant reinforcing agent, 0.3-1.5 parts of a lubricant and 0.3-1 part of an antioxidant. The surface of the silicon nano particles is modified by using a specific silane coupling agent, and the silicon nano particles are effectively combined with the ultrahigh-molecular-weight polyethylene matrix, so that the dispersibility of the nano particles in the polymer matrix is solved, and the wear resistance and the mechanical properties of the pipe are remarkably improved.

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

The invention discloses a novel synergistic concrete additive. A preparation method comprises the following steps: 1) preparing modified zirconium oxide; 2) obtaining a mixture; (3) stirring and mixing 10-20 parts by weight of modified zirconium oxide in the step (1), 8-14 parts by weight of a water reducing agent and 6-9 parts by weight of an expanding agent at the stirring speed of 30r / min-40r / min, adding 5-9 parts by weight of waste residues in the stirring process, and stirring for 20-30 minutes to obtain a synergist; after the concrete modifier is used, the corrosion resistance and the wear resistance of concrete are improved, the interface bonding degree with powder such as cement is improved, the compactness of an interface structure is increased, formation of cracks is inhibited, and the durability of the concrete is improved; and the modified zirconium oxide is used, so that the impact and abrasion resistance of the concrete is improved, and the strength, the impermeability and the freezing resistance are improved.

The invention relates to the technical field of composite current collector production, in particular to an adapter welding method of a composite current collector. According to the invention, the outer side of the blank area of the composite current collector is folded inwards to form the folded B-surface metal layer, so that the folded blank area is obtained; and covering the turned blank area with a transfer metal foil, and welding in a pole piece welding area, so that the A-surface metal layer of the composite current collector, the turned B-surface metal layer and the transfer metal foil are welded together to obtain the composite current collector after transfer welding. According to the invention, the A / B surface metal layer of the composite current collector is conducted only by adopting the single-surface metal foil, so that the waste of the foil is reduced, and meanwhile, the resistance performance is better than that of a transfer welding scheme without using the metal foil.

The invention provides a carbon fiber reinforced polyether-ether-ketone self-lubricating composite material and a preparation method and application thereof.The preparation method comprises the steps that carbon fiber serves as an anode, voltage is applied to an electrolyte solution, electrochemical oxidation treatment is conducted, hydroxylated carbon fiber is obtained, the hydroxylated carbon fiber and 2-amino-5-nitrobenzothiazole are mixed, and the carbon fiber reinforced polyether-ether-ketone self-lubricating composite material is obtained. Adding an anhydrous modified reaction solvent, and reacting at 25-40 DEG C for 4-10 hours to obtain modified carbon fibers; and melting and granulating the self-lubricating composite material: mixing the modified carbon fiber, polyether-ether-ketone, a lubricant and an auxiliary agent in a high-speed mixer for 10-20 minutes, extruding by using a double-screw extruder, cooling, and granulating to obtain the carbon fiber reinforced polyether-ether-ketone self-lubricating composite material. The carbon fiber reinforced polyether-ether-ketone self-lubricating composite material is applied to self-lubricating mechanical parts. According to the self-lubricating composite material, the self-lubricating performance is improved, the interface bonding energy between the carbon fibers and the polyether-ether-ketone is enhanced, and the self-lubricating composite material has good mechanical performance.

The present application relates to the technical field of road engineering pavement materials, in particular to a composite asphalt regenerant, a preparation method, a use method and an application thereof.The regenerant comprises, by mass percentage, 30-70% of aromatic component oil, 15-50% of hydrogenated base oil, 5-10% of a curing accelerator, 3-10% of a low-temperature stabilizer, 0.5-3.0% of an antioxidant, 0.5-5.0% of a diluent and 1-5% of an ammonium ion stabilizer.The present application significantly reduces the viscosity of the regenerant through multi-component synergy, realizes normal-temperature construction in all seasons, effectively restores the penetration and softening point of aged asphalt, delays secondary aging through the synergy of the antioxidant and the ammonium ion stabilizer, and simultaneously enhances the low-temperature crack resistance and initial strength of the recycled mixture, and is suitable for plant-mixed hot recycling, in-place hot recycling and cold recycling processes.

The present application relates to the technical field of aerated concrete preparation, and particularly relates to a method for preparing electrically conductive aerated concrete by using porous carbonized recycled aggregate and the aerated concrete. The process method first places pre-wetted recycled aggregate in a pressurized carbonization kettle, and industrial waste gas with CO2 concentration greater than or equal to 20% is introduced to react for 2-3 hours at 0.5-0.7 MPa and 60-70 DEG C to produce porous carbonized recycled aggregate. Then the porous carbonized recycled aggregate is dry-mixed with gel material, gypsum, conductive carbon black and reinforcing fibers, and then mixing water containing water reducing agent (water aggregate ratio 55-60%) is added to stir into base mortar. Then aluminum paste suspension is added to the mortar, and after stirring to start aeration, the mortar is poured into a mold. After 2-3 hours of static aeration, the mold is finally autoclaved and dried for 6-8 hours to obtain the electrically conductive aerated concrete. Through aggregate pretreatment strengthening, orderly dispersion of the conductive phase and hierarchical curing control, the present application can effectively solve the contradiction between light weight, high strength, electrical conductivity and durability, and provide a multifunctional green building material solution for airport construction.

The invention belongs to the technical field of road and bridge paving materials, and discloses an anti-rutting epoxy asphalt toughening additive. The formula comprises the following components in parts by weight: 40 parts of solid epoxy resin, 35 parts of a latent polyester curing agent, 5 parts of an ultra-high molecular weight epoxy toughening agent, 20 parts of a water damage resistant improver, 100 parts of hard asphalt particles, 2 parts of an antioxidant, 5.5 parts of a silane coupling agent, 6 parts of nano silicon dioxide, 0.1 part of a curing accelerator, 0.5 part of a light stabilizer and 1 part of a lubricating separant. In the formula, solid epoxy reacts with a latent polyester curing agent to form a three-dimensional rigid structure, and the three-dimensional rigid structure is matched with oxidized asphalt particles and nano silicon dioxide, so that the high-temperature stability and the pressure resistance are remarkably improved, and ruts are inhibited from the source; the ultra-high molecular weight epoxy flexibilizer can prolong the molecular chain segment of a cross-linking point, and is combined with the curing accelerator to regulate and control the reaction rate, so that the low-temperature crack resistance and fatigue resistance are enhanced while the strength is ensured.

The present invention provides a method for preparing a micro-nano inorganic particle PP composite material, comprising the following steps: mixing PP granules, micro-nano inorganic particles and a dispersant; adding them into a twin-screw extruder for melt blending, extrusion and granulation to obtain granules; drying the granules, and then injection molding them using an injection molding machine. The present invention uses micro-nano inorganic particles to enhance the mechanical properties of PP materials. The micro-nano inorganic particle matrix is ​​a micro-crosslinked structure obtained by carbonizing starch and formed by interconnecting microgel particles through physical forces. Then, by doping spiral fibers, a network interpenetrating three-dimensional structure is formed, and the stability of the micro-crosslinked structure is further enhanced. When the material is subjected to a load, the stress is first borne by the three-dimensional structure, then propagated to the carbonized spiral fibers, and finally evenly distributed in the microgel particles, thereby reducing stress concentration and improving the material's fracture resistance.

The invention discloses a high-diffusivity micro-fractured rock mass interface reinforcing grouting material and a preparation method thereof, and relates to the field of underground engineering fractured rock mass reinforcement, the grouting material comprises the following raw material components: a cementing material, an interface reinforcing agent and a modification additive; wherein the cementing material comprises the following components: superfine Portland cement; the interface reinforcing agent is prepared from the following raw material components: alkyl tertiary amine dihydric phosphate, beta-hydroxyalanine, 4-cyano valeric acid, tetrahydrofuran and ammonium chloride. The interface reinforcing agent is used for modifying the grouting material, when cement particles are blocked by micro-cracks, interface reinforcing components can further permeate into the micro-cracks, the diffusion performance of the grouting material is improved, and the problem that in the prior art, cement and other turbid liquid type grouting materials are poor in diffusivity in micro-crack rock mass is solved.

This invention relates to the field of reinforcement materials technology, specifically to reactive low-temperature reinforcement materials for mining, their preparation methods, and applications. The reactive low-temperature reinforcement material for mining comprises component A and component B. Component A consists of polyester polyol, polyether polyol, silane coupling agent, and catalyst; component B consists of prepolymer and additives. The prepolymer is obtained by reacting polyether polyol b with polymethylene polyphenyl polyisocyanate. Polyether polyol b has a functionality of 3.1 and a hydroxyl value of 207 mg KOH / g, and is a polyether polyol polymerized with propylene oxide using maltitol, trimethylolpropane, hydroquinone, and triethylene glycol as initiators. The material prepared by this invention is primarily reactive in structure and flame-retardant, avoiding the impact of adding large amounts of additive flame retardants on material strength. The resulting material exhibits high compressive strength, low internal heat of reaction, and good flame-retardant properties.

The invention discloses a method for preparing high-strength engineering plastic from recycled PA66 plastic and application of the high-strength engineering plastic, and relates to the technical field of chemical engineering. The method at least comprises the following steps: warehousing and homogenizing the recycled PA66 plastic; crushing the homogenized PA66 plastic, uniformly premixing the crushed PA66 plastic with a chain extender and an antioxidant, and performing a first extrusion process to obtain rPA66; putting part of the rPA66, the antioxidant, the lubricant, the compatibilizer, the black sand and the light stabilizer into a high-speed mixer, and uniformly mixing to obtain a premix; and performing a second extrusion process on the premix, the modified carbon fiber and the remaining rPA66 to obtain the high-strength engineering plastic prepared from the recycled PA66 plastic, wherein the modified carbon fiber is obtained by modifying a silane coupling agent, carbon nanotubes and polyvinyl alcohol. The high-strength engineering plastic with excellent mechanical properties is obtained by modifying the carbon fibers through the grafted silanized carbon nanotubes and the polyvinyl alcohol to serve as a reinforcing agent for recycling the PA66 and cooperating with an optimized side feeding and fiber adding process.