1944 results about "Calcium carbonate" patented technology

The invention belongs to the technical field of sandy soil reinforcement, and relates to a sandy soil reinforcement method combining modified chitosan film coating and cementation with biomimetic mineralization and application, the sandy soil reinforcement method comprises the following steps: S1, chitosan is subjected to swelling, alkalization, carboxymethylation and refining treatment to obtain modified chitosan; s2, respectively preparing a calcium chloride solution and a sodium carbonate solution with the same concentration; a calcium chloride solution is a cementing solution A; adding modified chitosan into a sodium carbonate solution, and uniformly stirring to form a cementing solution B; s3, the cementing liquid A is sprayed to the sandy soil, then the cementing liquid B is sprayed, and primary cementing is completed; carrying out circulating cementing for 5-20 times according to the spraying mode; and then air drying is conducted to complete sandy soil reinforcement. According to the invention, the agglomeration among calcium carbonate particles is enhanced by utilizing the cementing, film covering, mineralized crystal form adjusting and filling coupling effects of the modified chitosan, so that the calcium carbonate particles form effective cementing connection among sand particles, thereby improving the mechanical properties of the sand.

The invention discloses silencing and mildew-proof organic silica gel as well as a preparation method and application thereof, and belongs to the technical field of organic silicon binding material polymers. Comprising the following components in parts by weight: 35-45 parts of nano calcium carbonate, 32-40 parts of hydroxyl-terminated polysiloxane, 5-9 parts of silencing powder, 0.5-2.5 parts of glass fiber powder, 5-9 parts of a hyperbranched polymer, 2-5 parts of a hydrophobic surface modifier, 1.5-3 parts of color paste, 1-2 parts of a water-based coupling agent, 1-2 parts of a cross-linking agent, 0.5-2.5 parts of a mildew preventive, 0.4-2 parts of a composite titanide and 0.4-0.7 part of nano silver powder. According to the invention, the nano silver powder and the mildew preventive are compounded, and an inorganic sterilization system is combined, so that broad-spectrum environment-friendly bacteriostasis is realized, and high-humidity long-acting protection is met; the powder is subjected to hydrophobic treatment, moisture is blocked, and high adhesion is kept; silencing powder serves as a core, a sound absorption network is cooperatively formed, the noise reduction capacity is improved, and the device is suitable for multiple scenes.

The invention discloses a high-temperature dechlorinating agent for removing hydrogen chloride gas and a preparation method of the high-temperature dechlorinating agent, and belongs to the technical field of dechlorinating, and the preparation method of the high-temperature dechlorinating agent for removing the hydrogen chloride gas comprises four steps of preparing sepiolite-loaded active calcium powder, preparing copper-aluminum coated calcium carbonate whiskers, forming and roasting. According to the high-temperature dechlorinating agent for removing the hydrogen chloride gas, the penetration chlorine capacity is 78.5 to 81.7 percent, the crushing strength is 142 to 160N. Cm <-1 >, and the abrasion rate is 0.8 to 1.2 percent.

The invention discloses an amino acid-amide-saccharide composite leaching agent and application thereof, and belongs to the technical field of industrial solid waste recycling and carbon dioxide capture and utilization, the composite leaching agent is formed by compounding a main leaching agent amino acid, an auxiliary leaching agent amide compound and an auxiliary chelating agent saccharide or a derivative thereof. According to the method, through the synergistic effect of the amino acid, the amide and the saccharide chelating agent, the calcium ions in the calcium-containing solid waste can be efficiently and highly selectively leached under the mild condition without additional acid. According to the composite system, through multiple coordination and spatial screening effects, the leaching selectivity of calcium ions can reach 99.5% or above, and dissolution of impurities is effectively inhibited; the zwitterionic characteristics of amino acid and the coordination of amide are utilized to realize proton self-sufficiency in the system and simplify the process; all the components have good biocompatibility and are green and environment-friendly; the composite system can also be used as a crystal modifier to induce high-purity calcium carbonate.

The invention discloses a preparation method of a rubber waterstop material with a low compression set rate, which comprises the following steps: firstly, carrying out blending reaction on hydroxyl silicone oil and boric acid to obtain liquid polyborosiloxane; the preparation method comprises the following steps: adding liquid polyborosiloxane and natural rubber into an internal mixer according to a ratio, and carrying out internal mixing to obtain a mixture; adding zinc oxide, an anti-aging agent, stearic acid and an anti-tearing agent into the obtained mixture, and continuously mixing; continuously adding kaolin talcum powder, calcium carbonate, calcium oxide, white carbon black, N550, N330 and KH550, and internally mixing again to obtain a preform; adding a vulcanization accelerator and a vulcanizing agent into the preform, and continuously mixing to obtain a rubber material to be vulcanized; and vulcanizing and forming the rubber material to be vulcanized to prepare the rubber water-stop belt material with the low compression set rate. According to the invention, the compression set rate of the rubber material can be reduced while the tensile strength, elongation, tear resistance and other properties of the rubber are not sacrificed, so that the product performance is enhanced.

The invention discloses self-repairing concrete based on modified carbon fibers and a preparation method thereof, and belongs to the technical field of building materials. An existing concrete crack repairing technology has two major problems that bonding between carbon fibers and a matrix is poor, and the repairing effect is limited; microbial self-repairing and nutrient adding can reduce the strength of the concrete. According to the solution provided by the invention, firstly, the surface of the carbon fiber is modified by an MICP method to form a stable three-dimensional calcium carbonate coating layer, so that the surface roughness is enhanced, the interface bonding capacity of the carbon fiber and a gelling matrix is greatly improved, and the carbon fiber is stably attached to an interface; then, the modified carbon fibers and concrete raw materials are accurately mixed according to a specific proportion, and the high-strength and good-crack-resistance self-repairing concrete is prepared. When cracks are generated, the carbon fibers limit crack propagation with high strength and high ductility, and surface microorganisms generate calcium carbonate through physiological reaction to fill the cracks; the strength, crack resistance and self-repairing capacity of a concrete structure are improved, the service life is prolonged, and the concrete is suitable for a hydraulic concrete structure in a complex environment and wide in application prospect.

The invention discloses a water-based single-component super-amphiphobic refrigeration coating, a coating and a preparation method of the coating, and relates to the technical field of coatings. 20-35 parts of a second filler; 5-10 parts of a third filler; 20-35 parts of a film-forming substance, 1-9 parts of an auxiliary agent and 3-50 parts of water; the first filler comprises fluorine-containing silane modified fumed silica; the second filler comprises at least one of long-chain silane modified precipitated barium sulfate, long-chain silane modified calcium carbonate and long-chain silane modified hollow glass beads; the third filler comprises an infrared emission filler treated by an organic silicon modifier. By modifying the filler, the purposes of stable dispersion and functional synergy of low-surface-energy substances and high-proportion inorganic nano filler in a water-based system are achieved.

The invention provides dust-free antibacterial deodorant bentonite cat litter and a preparation method thereof, and belongs to the technical field of cat litter. Firstly, a certain amount of sodium bentonite, baking soda and calcium carbonate are used for preparing bentonite cat litter, then polyvinyl alcohol and sodium carboxymethyl cellulose which have the film forming property, polyhexamethylene guanidine hydrochloride which has the bactericidal property and soybean ethyl sulfate morpholine which has the deodorization function are used for preparing the bentonite cat litter; the components are compounded to obtain a functional dust suppressant with antibacterial, deodorant and film-forming effects, the functional dust suppressant is sprayed and coated on the surface layer of the bentonite cat litter, so that the prepared dust-free antibacterial and deodorant bentonite cat litter is remarkable in deodorant and antibacterial effects and good in wear resistance, and a layer of water-soluble film is formed on the surface of the dust suppressant after the functional dust suppressant is sprayed for dust suppression treatment, so that the dust suppression effect is good. The bentonite cat litter has the advantages that the structure and the film-forming property of the surface layer of the bentonite cat litter are improved, the hardness and the wear resistance of the surface are improved, the dust suppression effect of the cat litter is obviously improved, dust is extremely low under simulated falling and transportation conditions, and the cat litter has excellent water absorption and caking performance.

The invention relates to the technical field of shield tunnel construction, and discloses a shield tunnel segment joint waterproof material and a waterproof structure, the shield tunnel segment joint waterproof material comprises a component A and a component B; the component A comprises the following component: 30-40 parts of liquid polysulfide rubber; 5 to 10 parts of a fluorinated polyurethane prepolymer; 1-5 parts of a silane coupling agent; 3-5 parts of fumed silica; 8-15 parts of hollow glass beads; 10 to 15 parts of nano calcium carbonate; 0.5 to 2 parts of polytetrafluoroethylene micro powder; 0.1 to 1 part of ettringite; the component B comprises the following component: 1-5 parts of manganese dioxide; and 5 to 10 parts of dioctyl phthalate. By utilizing the characteristics that the sealing gasket has excellent fluidity during injection and can be automatically cured into a high elastomer within a set time, a pre-installed sealing gasket can be replaced by adopting an innovative injection process, and the construction difficulty faced by high-precision shield segment assembly in a high-water-pressure environment is effectively solved.

The invention relates to the technical field of cables, and provides a high-toughness corrosion-resistant medium-voltage power cable, which comprises a conductor, and an insulating layer, a shielding layer, an armor layer and a sheath layer which are sequentially arranged outside the conductor, the sheath layer comprises the following components in parts by weight: 70-100 parts of polyvinyl chloride, 30-40 parts of nitrile rubber, 10-15 parts of a flame retardant, 15-20 parts of a plasticizer, 1-3 parts of an antioxidant, 5-10 parts of a filler, 2-4 parts of a heat stabilizer, 1-3 parts of a compatilizer and 0.5-2 parts of a cross-linking agent; the filler is prepared from the following raw materials in parts by weight: 100 parts of calcium carbonate, 20 to 24 parts of 2-ethylhexyl acrylate and 6 to 10 parts of acrylic acid. According to the technical scheme, the problem of poor corrosion resistance of the medium-voltage power cable in the prior art is solved.

The invention relates to a waterproof sealing gasket material for a shield tunnel and a preparation method of the waterproof sealing gasket material. The preparation method comprises the following steps: plastifying raw rubber to obtain plastified raw rubber; the preparation method comprises the following steps: stirring and mixing plasticated raw rubber, carbon black N550, calcium carbonate, paraffin oil, zinc oxide, stearic acid, calcium oxide, an anti-aging agent and an organic magnesium compound, mixing in a mixing mill, and cooling to room temperature to obtain a mixture I; stirring and mixing the mixture I, modified NPE particles and an accelerant, mixing, and cooling to room temperature to obtain a mixture II; uniformly mixing the mixture II and sulfur in a mixing mill, vulcanizing at high temperature, and standing at room temperature for 24 hours to obtain the waterproof sealing gasket material. According to the waterproof sealing gasket material, the modified NPE particles of the core-shell structure are added, the compatibility of a water-swelling material and non-polar rubber is improved, the organic magnesium compound is added as a multifunctional auxiliary agent, the interface bonding, vulcanization network and flame retardant performance are synergistically improved, and the waterproof sealing gasket material has good waterproof performance. The prepared sealing gasket material has excellent mechanical properties, heat aging resistance, compression set resistance and flame retardance.

The invention discloses a self-repairing synchronous grouting material and a preparation method thereof, and belongs to the technical field of grouting materials. The self-repairing synchronous grouting material comprises a cement base material, a microbial capsule and chitosan calcium salt, the concrete comprises the following raw materials in parts by mass: 7-12 parts of Portland cement, 20-28 parts of fly ash, 40-55 parts of quartz sand, 20-30 parts of water, 2-7 parts of bentonite, 1-5 parts of microbial capsules and 1-5 parts of chitosan calcium salt. The self-repairing synchronous grouting material disclosed by the invention is combined with a microorganism self-repairing technology, and mineral substances such as calcium carbonate and the like can be generated through metabolic activity of microorganisms when the material has cracks, so that the cracks are automatically filled, and expansion of the cracks on the surface of a concrete material can be effectively prevented; the grouting material can continuously repair microcracks caused by environmental changes or construction stress in the long-term use process, and the integrity and stability of the structure are kept.

The invention relates to the technical field of fluid-state solidified soil, and particularly discloses high-fluid-state solidified soil and a preparation method thereof. The high-flow-state solidified soil is prepared from the following raw materials in parts by weight: 1100 to 1200 parts of recycled aggregate, 700 to 800 parts of river sand, 100 to 130 parts of a curing agent, 18 to 22 parts of a polycarboxylic acid water reducing agent, 75 to 85 parts of solidified soil repairing microcapsules and 55 to 95 parts of water, the solidified soil repairing microcapsule is prepared by taking polylactic acid and nano calcium carbonate grafted polyethylene glycol as composite membrane materials, and wrapping and forming sulphoaluminate cement paste through an emulsification-solidification method. The solidified soil repairing microcapsules are introduced into the solidified soil, pores in an interface transition area can be filled, micro cracks can be repaired, and the durability of the solidified soil is improved.

Processes and apparatuses for degrading PFAS into calcium fluoride, carbon dioxide, and water. PFAS are heated and introduced to a calcium base which will degrade the PFAS. The PFAS may be in a stream that is a PFAS enriched stream formed by desorbing the PFAS from an adsorbent which removed the PFAS from a contaminant stream. The PFAS may be desorbed in the presence of the calcium base. The calcium base may be calcium hydroxide, calcium oxide, calcium carbonate, or combinations thereof.

The invention discloses bi-crosslinking self-reinforced hydrogel based on endogenous glucose in-situ initiation as well as a preparation method and application of the bi-crosslinking self-reinforced hydrogel, and relates to the technical field of biomedical materials. The double-crosslinking self-enhanced hydrogel is prepared from the following components in concentration: 1 to 3 weight percent of hyaluronic acid-tyramine, 0.8 to 1.2 weight percent of sodium alginate, 1 to 100 mmol / L of calcium carbonate, 0.0001 to 10 U / mL of horse radish peroxidase, 20 to 40 U / mL of glucose oxidase and the balance of ultrapure water. The invention also discloses an application of the double-crosslinking self-reinforced hydrogel in preparation of a filling and repairing product for soft tissue defects. The hydrogel disclosed by the invention can be filled in a tissue defect part in an injection manner, glucose in body fluid is utilized to initiate crosslinking in situ to form the hydrogel with excellent mechanical properties and long-term stability, and meanwhile, the hydrogel is good in biocompatibility and relatively high in application value.

The invention relates to a starch pore-enlarging type high-chlorine-capacity long-acting high-temperature dechlorinating agent and a preparation method thereof, and belongs to the technical field of dechlorinating, the starch pore-enlarging type high-chlorine-capacity long-acting high-temperature dechlorinating agent comprises the following raw materials: complexing coating calcium hydroxide, modified hydroxyapatite, a composite inorganic adhesive, reinforcing and toughening whiskers, a composite pore-forming agent, a composite synergist, nano calcium carbonate and water; according to the starch reaming type high-chlorine-capacity long-acting high-temperature dechlorinating agent obtained by the invention, the breakthrough chlorine capacity is 40.9 to 44.9 percent, the crushing strength is 139 to 151N. Cm <-1 >, and the abrasion rate is 0.8 to 1.5 percent.

The invention belongs to the technical field of biomedical materials, and discloses pH-responsive injectable hydrogel as well as a preparation method and application thereof. Comprising the following steps: (1) dissolving sodium alginate in water to form a uniform solution; (2) adding a fat-soluble small molecule drug and Fe3O4 nanoparticles into the solution, carrying out high-speed shearing dispersion under an ice-water bath condition to form a drug / nano composite system, and standing; and (3) sequentially adding a calcium carbonate suspension and glucolactone into the drug / nano composite system, uniformly stirring, and incubating until the mixture is completely cured to obtain the pH-responsive injectable hydrogel. The hydrogel obtained by the invention not only has excellent injectability and pH response release performance, but also can remarkably improve the loading efficiency of fat-soluble drugs, and provides a new technical approach for realizing local anti-tumor treatment.

The invention relates to a base metal high-voltage multilayer ceramic dielectric capacitor and a preparation method, the base metal high-voltage multilayer ceramic dielectric capacitor is formed by stacking and firing dielectric layers, and each dielectric layer comprises a dielectric layer and an electrode printed on the dielectric layer. The dielectric layer comprises the following raw materials: a BMYT main matrix, an NN material, magnesium oxide, manganous-manganic oxide, zirconium dioxide, calcium carbonate, strontium carbonate and rare earth oxide; through the raw material composition and the preparation method of the ceramic dielectric capacitor, the prepared ceramic dielectric capacitor has excellent performances of high dielectric constant, high voltage resistance, stable dielectric-temperature characteristic curve, low loss, high insulation resistance, long-term high-voltage reliability and the like under the condition of high dielectric thickness (30 microns before firing).

The invention discloses a natural gas hydrate generation accelerant containing amino acid and nano calcium carbonate as well as a preparation method and application of the natural gas hydrate generation accelerant, and belongs to the technical field of natural gas hydrates. The problems of low natural gas hydrate forming rate, low gas storage density, low natural gas recovery efficiency, poor environmental protection property and the like in the prior art are solved. The accelerant is obtained by taking a hydrophobic amino acid solution as a base solution, adding nano calcium carbonate into the base solution and adjusting or not adjusting the pH value. By regulating and controlling the type and the concentration of a base solution in the accelerant, the hydrate formation rate and the gas storage density are improved, and the induction time of hydrate generation is shortened; nanoparticles in the accelerant are small in particle size and large in specific surface area, so that disturbance and convective heat transfer of the accelerant are enhanced; in addition, the chemical components of the nanoparticles in the accelerant and the main component of the seabed sediment with a large amount of natural gas hydrate in the nature are calcium carbonate, the environmental risk is reduced, and the calcium carbonate and hydrophobic amino acid are wide in source and environmentally friendly.

The invention relates to a method for preparing thick mud from shield siltstone slag to prevent slurry loss, and belongs to the technical field of urban underground engineering construction. The method for preparing thick mud from shield siltstone slag to prevent slurry loss comprises the following steps: preparation of slurry: taking bentonite slurry as base slurry, and then adding waste weathered rock powder, calcium carbonate, sodium carbonate, xanthan gum or electropositive gel to prepare plastic flowing slurry, so that the slurry reaches certain density and viscosity; in the tunneling process of the shield tunneling machine, prepared slurry is injected out of a shield shell through a plurality of grouting holes in the radius direction and formed in the circumferential direction of the shield shell of the shield tunneling machine, and the slurry is diffused along the surface of the shield shell and fills gaps of a shield body within a certain range; according to the method, the waste soil generated by the shield tunnel can be effectively utilized, the moisture content and fluidity of the cabin soil are controlled, meanwhile, shield tail cement grout is prevented from entering the cutterhead and the soil cabin to threaten construction safety, operation is easy and economical, and the construction efficiency is improved.

The invention belongs to the technical field of coal chemical industry grey water treatment, and particularly relates to an advanced treatment method and system for coal chemical industry grey water circulating water. The method integrates pretreatment, complexing cracking, fractional crystallization and deep deamination, and is characterized in that a chelating structure of an organic phosphorus dispersing agent and calcium and magnesium ions is thoroughly destroyed through an advanced reduction-advanced oxidation combined process, target ions are released, and the core problems that hardness removal is hindered and phosphorus pollution is caused are solved; then, calcium and magnesium are respectively converted into calcium carbonate and magnesium ammonium phosphate particles for resource recovery by utilizing a secondary crystallization technology, so that the bottlenecks of high alkali liquor consumption and salt accumulation of a traditional high-pH magnesium ion precipitation method are broken through; and finally, the residual ammonia nitrogen is deeply removed by adopting a pollution-resistant PTFE hydrophobic membrane, so that the residual ammonia nitrogen is efficiently and stably removed, and the problem that a traditional polypropylene material membrane system is easy to pollute and block, easy to oxidize and difficult to apply to the field is solved.

The utility model discloses grinding equipment for producing calcium carbonate powder, which comprises a rack, a shell and a driving part which are arranged on the rack, and a grinding mechanism arranged in the shell, the grinding mechanism comprises a grinding disc, a grinding roller assembly and a rotating main shaft, the grinding disc is rotatably arranged in the shell, the rotating main shaft vertically penetrates through the grinding disc, and the grinding roller assembly is arranged in the shell. A star rack is fixed at the top end of the rotating main shaft, the grinding roller assembly is mounted on the star rack and extends into the grinding disc, a large gear ring is fixedly arranged at the bottom of the grinding disc, a sun gear is fixedly arranged on the rotating main shaft, a planet carrier is fixedly arranged in the shell, and a planet gear meshed with the sun gear and the large gear ring at the same time is arranged on the planet carrier. The grinding disc is driven to rotate reversely while the grinding roller assembly is driven to rotate through the driving piece, the relative movement speed between the grinding disc and the grinding roller assembly is increased, shearing, extruding and grinding effects on materials are more complex and stronger, distribution is more uniform, and the grinding efficiency and the product fineness are improved.

The invention discloses a hydrothermal passivation method for a calcium carbonate film layer on the surface of a magnesium alloy, and belongs to the technical field of magnesium alloy surface treatment.The hydrothermal method is adopted for conducting passivation treatment on the magnesium alloy coated in a water bath, a new compact layer is formed under an original calcium carbonate deposition film with defects, and internal passivation of the coated magnesium alloy is achieved. And the corrosion resistance of the coated magnesium alloy is obviously enhanced.

The invention relates to the technical field of high polymer materials, and discloses a PVC (polyvinyl chloride) pipe for communication wiring and a preparation method thereof, and the pipe is prepared from polyvinyl chloride resin, a calcium-zinc composite heat stabilizer, stearic acid, polyethylene wax, maleic anhydride grafted polyethylene, an acrylate processing aid, nano calcium carbonate and an active lubricating precursor. The active lubricating precursor is a mixture formed by compounding amino-terminated polysiloxane and zinc stearate through heating and swelling. The preparation method of the PVC pipe for communication wiring comprises the steps of pre-preparation of the active lubricating precursor, multi-stage temperature-control high-speed mixing and reactive extrusion molding. Through in-situ chemical reaction of amino-terminated polysiloxane and maleic anhydride grafted polyethylene in the extrusion process, chemical anchoring of lubricating molecules is realized, the problem of precipitation of a lubricant is solved, and meanwhile, the lasting smoothness, impact strength and dimensional stability of the inner wall of the pipe are improved by cooperating with nano calcium carbonate.

The invention provides a soilless phase reservoir protection water-based drilling fluid as well as a preparation method and application thereof, and belongs to the technical field of drilling fluids. The drilling fluid is prepared from the following raw materials in parts by mass: 100 parts of water, 0.2-0.4 part of a first pH regulator, 1-3 parts of a deoxidant, 0.1-0.4 part of a tackifying and shear strength improving agent, 2-4 parts of a filtrate reducer, 4-6 parts of magnesium-aluminum hydrotalcite, 4-6 parts of micro-nano aluminum oxide, 4-6 parts of superfine calcium carbonate, 4-6 parts of a lubricant, 1-2 parts of a corrosion inhibitor and 70-660 parts of an inorganic salt weighting agent. The drilling fluid disclosed by the invention is excellent in high-temperature resistance, good in rheological property and excellent in filtrate loss reduction performance; the drilling fluid disclosed by the invention can be prepared into saturated CaCl2 and saturated CaBr2 systems, does not contain barite and clay, is high in mud cake acid solubility, has permeability recovery of more than 72% after plugging, is good in reservoir protection, and has potential of on-site large-scale application.