10results about How to "Improve physical and mechanical properties" patented technology

The application discloses a kind of based on multiple-source solid waste's improved red sandstone roadbed filler and mix proportion optimization method, belong to the field of red sandstone filler green low carbon improvement.Improved red sandstone roadbed filler is red sandstone as improved matrix, with match calcium carbide slag, rice husk ash, fly ash as cementing component preparation, wherein calcium carbide slag provides calcium source and alkaline environment, rice husk ash provides silicon source, fly ash provides aluminum source, three reactions occur in alkaline environment and generate abundant cementing products, realize red sandstone improvement.At the same time, with three cementing component contents as design variable, with bearing ratio, unconfined compressive strength, water stability coefficient as road evaluation index, construct road performance response model, through multi-index optimization, clear cementing component optimization ratio range.The method can exert the synergistic effect of multiple-source solid waste chemical composition, can be optimized according to different application scene performance requirements Ratio, realize red sandstone efficient improvement and multiple-source solid waste high-value utilization, with economic benefit and environmental benefit.

This invention provides a method for preparing a mixed-grain cold heading die material and the mixed-grain cold heading die material itself. The method involves mixing two types of powders with different grain sizes—WC powder, Co powder, and Cr2C3 powder—with paraffin wax. The mixture is then subjected to wet milling in a ball mill, drying and sieving, pressing, dewaxing and pressure sintering, and rapid cooling to obtain a high-performance mixed-grain cold heading die material. This preparation method is simple, requires no special equipment, has low production costs, and has broad application prospects.

The present application relates to a kind of environment-friendly flame-retardant cold-pressing adhesive and its preparation method.The raw materials of the environment-friendly flame-retardant cold-pressing adhesive include 14-21 parts of modified hydrosol, 5-15 parts of magnesium sulfate, 25-35 parts of magnesium chloride, 95-105 parts of magnesium oxide and 0.001-0.01 parts of boric acid by weight.The modified hydrosol is prepared by oxidation crosslinking reaction of propylene hard monomer and hydrosol precursor in the presence of oxidant and crosslinking agent.The adhesive obtained by compounding modified hydrosol with magnesium oxychloride and magnesium oxysulfate inorganic glue has the advantages of high mechanical and bonding strength, good water resistance, and good flame-retardant effect.The modified hydrosol provided by the present application has crosslinking network and abundant hydroxyl and carboxylic acid groups, which gives the adhesive excellent permeability and bonding strength.Magnesium oxychloride inorganic glue enhances the mechanical strength of the adhesive, and magnesium oxysulfate inorganic glue enhances the water resistance of the adhesive.The present application also relates to a plywood containing the above-mentioned environment-friendly flame-retardant cold-pressing adhesive and its preparation method.

This invention relates to the field of building materials technology, and discloses a recycled aggregate concrete prepared from construction solid waste and its preparation method. The raw materials of the concrete include ordinary Portland cement, recycled coarse aggregate, natural fine sand, chemically targeted modification bags, quicklime powder, inducing water, and conventional mixing water. The preparation method is as follows: Dry recycled coarse aggregate containing old mortar is mixed with chemically targeted modification bags in a dry state, and then inducing water is sprayed evenly to allow the effective components to penetrate into the pores of the aggregate. Subsequently, quicklime powder is added, utilizing its exothermic effect to stimulate the modification bags to form micro-expansion crystalline precipitates within the pores, physically sealing micro-cracks in situ. Finally, cement, sand, and mixing water are added and homogenized to form the concrete. This invention effectively reduces the water absorption rate of recycled coarse aggregate and improves its strength, ensuring the overall workability and mechanical properties of the concrete, and achieving efficient and low-cost resource conversion of construction solid waste.

The application discloses a deep grouting plugging device for a building pile foundation in a karst site with water, which comprises a water pressure plug, a plurality of grouting units are arranged on the side of the water pressure plug, a smooth grouting unit is arranged below the water pressure plug, and the smooth grouting unit comprises, from bottom to top, a scraper assembly, a supplementary grouting assembly and a smoothing assembly. The grouting unit comprises a convex lens-shaped capsule, the capsule is filled with cement slurry, and a grouting needle tube extending in the horizontal direction is arranged at the center position of the capsule. The smooth grouting unit can effectively clean the burrs on the hole wall, provide the cement slurry to cover the hole wall and smooth the hole wall, so that the hole wall is smoother, the grouting unit can comprehensively grout the rock-soil body around the hole wall, and the strength, compactness and impermeability of the rock-soil body are improved. The technical problem that the plugging effect is poor due to the burrs on the rough hole wall and the loose rock-soil body around the hole wall in the prior art is solved.

This invention discloses a novel double-layer pipe roof reinforcement device and its implementation method. The pipe roof consists of two layers arranged in a staggered pattern. A movable sleeve is installed inside the pipe roof, and several steel nails that can pass through the pipe roof are fixed on the sleeve and inserted into the soil under grouting pressure. This effectively expands the reinforcement range of the pipe roof, enhances the self-bearing capacity of the surrounding rock, and achieves a significant reinforcement effect. Furthermore, this invention also discloses an implementation method for using this double-layer pipe roof reinforcement device, including: Step 1: Construction preparation; Step 2: Measurement and layout; Step 3: Installing measuring water pipes or sensors and installing impact drilling tools on the pipe roof steel pipes; Step 4: Installing the first section of steel pipe and starting the drilling rig; Step 5: After advancing 0.5m, verifying the construction parameters and adjusting them before continuing drilling; Step 6: Verifying the pipe roof construction parameters and checking the borehole formation; Step 7: Installing grouting pipes at the ends and filling the pipe roof steel pipes with cement grout; Step 8: Sealing the borehole.

The application discloses a kind of high-performance composite board and its preparation method, application, belong to high-performance material technical field.The high-performance composite board of the application includes top plate, bottom plate and the aluminum honeycomb core being arranged between the top plate and the bottom plate, aluminum honeycomb core includes the following mass percentage of elements:Zn:4.3%~5.5%, Mg:2.0%~2.5%, Cu:0.8%~1.2%, Zr:0.15%~0.23%, Mn:0.02%~0.06%, rare earth element:0.12%~0.3%, Ti:0.02%~0.04%, Si:0.3%~0.7%, Fe≤0.15%, impurity element≤0.01%, the balance is Al.The board is prepared by the way of combining wood material and aluminum alloy material, not only maintains the appearance and performance of wood, but also has the high strength and corrosion resistance of aluminum alloy material, the overall mechanical property is more excellent, not easy to crack, can also improve the sound insulation effect of composite board, endow product with higher value.

This invention relates to the technical field of solid waste recycling, and discloses a method for preparing building materials based on multi-source solid waste and a high-strength insulation board. The method for preparing building materials based on multi-source solid waste includes the following steps: pretreatment of oil shale slag, pretreatment of ammonia-alkali white mud and kitchen shell waste, pretreatment of waste photovoltaic panels, pretreatment of ferrosilicon manganese slag, pretreatment of lead-zinc slag and vanadium-titanium ore slag, pretreatment of fly ash and coal gangue, pretreatment of waste aerated concrete, preparation of ultra-high performance concrete, preparation of foamed concrete, etc. The high-strength insulation board includes a polyurethane board in the middle layer, and foamed concrete board layers and ultra-high performance concrete board layers are arranged sequentially on both sides of the polyurethane board. A steel grid mesh is set between the foamed concrete board layers and the ultra-high performance concrete board layers. The foamed concrete board layers are formed by pouring the prepared foamed concrete, and the ultra-high performance concrete board layers are formed by pouring the prepared ultra-high performance concrete.

This invention discloses a coating solution for preparing high-temperature resistant and high-thermal-conductivity epoxy-based conductive films, its preparation method, and its application. By weight, it comprises the following raw material components: 70-85 parts liquid epoxy resin, 15-30 parts solid epoxy resin, 5-35 parts latent curing agent, 0.5-5 parts accelerator, 300-600 parts conductive filler, 15-30 parts thermoplastic resin, 0.5-2 parts coupling agent, and 30-60 parts solvent. The thermoplastic resin is a phenoxy resin with a special chemical structure and a molecular weight of 20,000-65,000 g / mol. This invention, by introducing a high-temperature resistant thermoplastic resin into the coating solution formulation, enables the prepared conductive film product to possess excellent comprehensive properties such as toughness, adhesion characteristics, and high-temperature stability.

The invention provides a preparation method of a sepiolite-modified flame-retardant E0-grade medium-density fiberboard, which comprises the following steps: step 1, fiber preparation: carrying out cooking and hot grinding defibrating on a wood raw material to obtain wood fibers; step two, preparing modified sepiolite: a, carrying out acid activation treatment on sepiolite to remove impurities and increase the specific surface area; b, carrying out magnesium ion loading treatment on the sepiolite subjected to acid activation; c, carrying out organic surface modification treatment on the sepiolite loaded with the magnesium ions to improve the compatibility of the sepiolite with an adhesive and the binding force of the sepiolite with wood fibers so as to obtain modified sepiolite; step 3, sizing and drying the fibers; according to the invention, sepiolite subjected to acid activation and organic modification is introduced into a urea resin system, so that on the basis of keeping the feasibility of the original process, the free formaldehyde release amount of the board is greatly reduced, and the formaldehyde release amount of the obtained medium-density fiberboard can be stably controlled to be less than or equal to 0.05 mg / m and meets and is superior to the E0-level environmental protection level requirement.