100 results about "Sodium Bentonite" patented technology

The application relates to the technical field of building materials, and discloses a permeable crystalline self-healing waterproof material for concrete self-waterproofing, which is prepared from the following raw materials in parts by weight: 20-30 parts of sodium-based bentonite, 20-50 parts of sodium methyl silicate, 4-6 parts of a penetrating agent, 8-12 parts of a sulphoaluminate cement, 15-18 parts of a silicone zirconium, and 2-5 parts of a complexing agent; the complexing agent is composed of 2-[3-(4-pentylphenyl)prop-2-enylamino]benzoic acid and sodium ethylenediaminetetraacetate. The above technical scheme solves the problem of low mechanical performance and waterproofness of concrete in the prior art.

The invention belongs to the technical field of oil field gas channeling plugging agents, and discloses a high-molecular pre-crosslinked gel particle plugging agent suitable for a carbon dioxide drive oil reservoir and a preparation method of the high-molecular pre-crosslinked gel particle plugging agent. The raw materials comprise an acrylamide monomer, sodium bentonite, an acrylic monomer, an acid-resistant functional monomer, a temperature-resistant and salt-resistant functional monomer, a first cross-linking agent, a second cross-linking agent, an initiator, an inorganic reinforcing agent, an antioxidant and water. The prepared acid-resistant gel particle is good in temperature resistance, salt resistance and acid resistance and long in effective period of action, the viscosity of a system is increased after the particle swells for a certain time, the plugging capacity is enhanced, and the acid-resistant gel particle can be used as an excellent CO2 drive reservoir gas channeling plugging agent and is used for plugging a heterogeneous formation with developed micro-cracks.

The invention discloses a green and environment-friendly superfine bentonite anticorrosive coating and a preparation process thereof. The anticorrosive paint is prepared from 40 to 70 parts of water-based film forming matter, 0.3 to 3.0 parts of composite bentonite, 1.0 to 8.0 parts of a green corrosion inhibition system, 2.0 to 12.0 parts of an auxiliary agent, 0.30 to 0.40 part of a surface modifier, 10 to 30 parts of deionized water and 0.5 to 5 parts of a cosolvent. The composite bentonite is prepared by compounding sodium bentonite, nano titanium dioxide and a natural antibacterial extract according to the mass ratio of 100: (3-5): (0.3-2.0); the green corrosion inhibition system is formed by compounding molybdate, an organic corrosion inhibitor and a silane co-condensation compound. The preparation process comprises four key steps of preparation of a composite bentonite suspension, surface functionalization treatment, gradient shearing dispersion and coating blending. The salt spray resistance of the anticorrosive paint can reach 1150 hours, the VOC content is as low as 35 g / L, the antibacterial rate of the natural antibacterial extract is 97.2%, and the anticorrosive paint has excellent anticorrosive performance and green and environment-friendly characteristics.

The invention relates to a salt core production method, which comprises: stirring industrial salt, sodium bentonite, sodium water glass and absolute ethyl alcohol, taking out, placing into a drying furnace, carrying out thermal insulation, cooling, crushing, and screening with a screen; pouring the mixed salt into a lower mold cavity of the mold, pressing by an upper mold, lifting the upper mold, and ejecting the green body by a lower mold core; the green body is put into a sintering furnace for heat preservation, and then the cooked body is taken out for cooling; turning the cooked blank by using a forming cutter, and drilling after turning is completed; putting the salt core into a sintering furnace for heat preservation and then taking out; and packaging and storing the qualified products in a sealing bag. The method has the beneficial effects of low cost, simple and stable process, high product percent of pass and the like. Compared with a pure salt core, the salt core has the advantages of higher strength, better processability, fewer appearance defects and higher rate of finished products. The raw materials are simple, the product processability is better, and meanwhile the requirements for water solubility and low gas forming amount of aluminum alloy castings are met.

The invention discloses a pectin / titanium pillared bentonite composite adsorption material and a preparation method thereof, and belongs to the technical field of wastewater treatment. According to the method, sodium bentonite is used as a matrix, tetrabutyl titanate is used as a titanium source, titanium pillared bentonite is prepared through a sol-gel method, then the titanium pillared bentonite is compounded with a pectin solution, and the pectin / titanium pillared bentonite composite adsorption material is prepared. The problems that natural bentonite swells when encountering water and solid-liquid separation is difficult are solved through titanium pillared modification, and the specific surface area of the bentonite is increased from 21.22 m < 2 > / g to 116.23 m < 2 > / g; the material is endowed with excellent heavy metal complexation and flocculation performance through pectin compounding, the maximum adsorption capacity of the prepared pectin / titanium pillared bentonite composite adsorption material to Hg (II) reaches 31.40 mg / g, the flocculation settling time is shortened by 90% or above compared with natural bentonite, and the material has photocatalytic reduction performance. The invention has the advantages of wide raw material source, simple preparation process, low cost and no secondary pollution, and has wide application prospect in the field of heavy metal wastewater treatment.

This invention relates to the field of casting technology, specifically to a process for preparing easily collapsible clay sand and low-alloy steel bucket tooth shell molds using waste sand as raw material. The process is characterized by a formula comprising the following parts by weight: 90-110 parts recycled waste sand, 1-6 parts binder, 2-12 parts collapsing liquid, 0.2-2 parts thermal conductive agent, and 2-6 parts water. The binder is sodium-based bentonite, the collapsing liquid is a CH28 type aqueous solution, and the thermal conductive agent is magnesium peroxide. This invention is environmentally friendly, activating the effective binding capacity of bentonite, thus reducing the amount of bentonite added by 50%, while achieving 100% complete collapsibility of the low-alloy steel bucket tooth shell mold. It exhibits excellent collapsibility performance and achieves 95% recycling of waste sand, significantly reducing solid waste emissions and new sand consumption, saving new sand costs, and making a significant contribution to environmental and resource protection.

The utility model relates to the field of ecological restoration blankets, in particular to an integrated nutrient vegetation blanket device which comprises a blanket body, the blanket body comprises a hemp net layer, a mixed seed belt layer, a fiber material layer, a nutrient medium layer, a natural sodium bentonite layer and a filament machine-made geotextile layer, the hemp net layer is an upper layer and used for resisting external erosion, and the mixed seed belt layer is a lower layer and used for resisting external erosion. The mixed seed zone layer is the second layer, the mixed seed zone layer is provided with indigenous vegetation seeds, the limiting material layer is the third layer, through the synergistic effect of the materials of all the layers, comprehensive optimization of the vegetation growth environment is achieved, the vegetation recovery efficiency and success rate are improved, and the method has good application prospects in the fields of urban landscaping, barren mountain treatment, ecological restoration and the like. The device can exert excellent effects, the hemp net layer serves as the upper layer, good air permeability is guaranteed, external erosion such as wind and rain is effectively resisted, and a stable protection environment is provided for vegetation growth.

The application relates to the technical field of cat litter preparation, and discloses a mixed cat litter with antibacterial and color indicating functions and a preparation method thereof. The components of the mixed cat litter are mixed anthocyanins, sodium bentonite, taros, and honeysuckle in a mass ratio of 0.5-1.5:4:4:0.5-1.5. The mixed anthocyanins are a mixture of black carrot anthocyanins and camphor tree fruit anthocyanins in a mass ratio of 1:1. The cat litter prepared by the application has the functions of indicating the PH of cat urine, strong antibacterial function and strong color indicating function.

The invention particularly discloses a method for increasing the aluminum-silicon ratio through coal gangue anoxic roasting and application of the method, and relates to the technical field of solid waste resource utilization, and the method comprises the steps that coal gangue with the initial aluminum-silicon ratio being 0.8-1.0 is crushed; an assistant A and an assistant B are added into the coal gangue, and the assistant A is prepared by mixing vermiculite powder and a cetyltrimethylammonium bromide solution, performing ultrasonic treatment for 30 minutes, and then compounding and calcining with sodium bentonite; the assistant B is prepared by mixing a borax solution and a cerous nitrate solution, evaporating and crystallizing, drying and grinding; a double-helix conical mixer is adopted for mixing, and 0.5% of deionized water is sprayed; sealing the mixture, introducing nitrogen, and maintaining the residual oxygen content lt; the invention discloses an aluminum-rich material with the aluminum-silicon ratio of 3-5.5, the method comprises the following steps of: heating coal gangue to 400 DEG C at the temperature of 2% under normal pressure, preserving heat, roasting at the speed of 8 DEG C / min, cooling to 200 DEG C, performing coarse crushing and alkali dissolution, filtering, washing, drying and micronizing by jet milling to obtain the aluminum-rich material with the aluminum-silicon ratio of 3-5.5, the method can also be applied to preparation of mullite bricks, 4A molecular sieves and porous ceramic filter materials, the process is simple, the cost is low, and high-valued utilization of the coal gangue is realized.

The invention relates to a directional grouting method and system based on ionic electromigration response. The method comprises the following steps: preparing ion modified slurry containing an electric ionic surfactant; constructing a geoelectric field in the stratum target area; the ion modified slurry is injected into a stratum target area at preset pressure, charged ions in the ion modified slurry are directionally migrated in the potential gradient direction under the action of a ground electric field, and then the slurry is driven to integrally and precisely move towards the preset target area. The technical limitation that the diffusion direction of traditional grouting in a complex stratum is uncontrollable is broken through, centimeter-level directional migration of the slurry in an underground space is achieved, and meanwhile the sodium bentonite component in the system maintains the dispersion stability of the slurry through the physical-chemical synergistic effect; the coupling effect of an ion channel formed by the layered silicate structure and an electric field synergistically strengthens the electroosmosis migration power, so that the dual technical breakthrough of slurry directionality and stability is achieved.

An absorbent composition includes composite granules formed from at least diatomaceous earth and sodium bentonite. The diatomaceous earth can include greater than 50 weight % of the composition, based on the total weight of the composition, and a weight ratio of the diatomaceous earth to the sodium bentonite can be within a range of from 51:49 to 95:5. The individual particles of diatomaceous earth composed of the composite granules have a d90 particle size of 500 μm or smaller and the individual particles of sodium bentonite composed of the composite granules have a d90 particle size of 250 μm or smaller.

The invention belongs to the technical field of shield under-pressure bin opening, and particularly provides a composite clay mixed solution and application thereof, and the composite clay mixed solution is prepared from bentonite slurry, methyl cellulose and slaked lime; the bentonite slurry is obtained by mixing a bentonite solution and a sodium silicate solution, and the bentonite solution is obtained by mixing water and sodium bentonite. According to the composite clay mixed solution provided by the invention, methyl cellulose and slaked lime are introduced to synergistically enhance a system; specifically, methyl cellulose (MC) is used as a non-ionic thickening agent, and methoxyl (-OCH3) on a molecular chain of the methyl cellulose (MC) improves the consistency of a system through hydrogen-bond interaction. MC with the viscosity of 4000 mPa.s is selected in an experiment, and the addition amount of the MC is 0.3%-0.5% of the mass of the bentonite; the slaked lime and SiO2 in the bentonite are subjected to a pozzolanic reaction, and the shear strength of the system can be increased to 2.8 kPa within 6 h through the reaction.

The present application relates to the technical field of lubricating oil, and particularly relates to a high-temperature corrosion resistant lubricating oil and a preparation method thereof.The raw materials of the high-temperature corrosion resistant lubricating oil include, by mass fraction, base oil 130-190 parts, extreme pressure anti-wear agent 1-5 parts, amino-modified graphene 1-5 parts, antirust agent 0.1-1 part, antioxidant 1-3 parts, defoaming agent 0.1-1 part, trioctyl trimellitate 5-15 parts, sodium lignosulfonate 1-5 parts, and sodium bentonite 1-5 parts.The high-temperature corrosion resistant lubricating oil can not only meet the use requirements of bearings under the working conditions of high speed, high temperature and heavy load, effectively improve the anti-wear and friction-reducing properties of the lubricating oil under high temperature, but also has a simple preparation method and is suitable for large-scale popularization and application.

This invention relates to the field of bentonite waterproofing blanket technology, specifically a sodium-based bentonite waterproofing blanket with anti-wrinkle design. The blanket includes a main body with an integrated anti-wrinkle structure at its joint end, comprising: a tenon-and-mortise positioning strip, a tension-distributed reinforcing bar, a limiting frame, an anti-warping edge, and a buffer transition layer. By providing this integrated anti-wrinkle structure at the joint end of the main body, the tenon-and-mortise positioning strip enables interlocking and positioning constraints between adjacent waterproofing blankets. The tension-distributed reinforcing bar balances the multi-directional tension during the laying process, while the limiting frame restricts the displacement and scattering of sodium-based bentonite at the joint. Combined with the anti-warping edge on the outer side of the joint end to constrain edge deformation, and the buffer transition layer to coordinate the stress at the connection points of each component, the functional structures work together to constrain the displacement and deformation of the joint area of ​​the waterproofing blanket.

The invention discloses a cement-loaded multi-scale silicon source composite anti-seepage grouting material and a preparation method thereof, and belongs to the field of geotechnical engineering anti-seepage grouting materials. The grouting material is prepared from ordinary Portland cement, micron-scale rice hull ash, nano-scale nano silicon dioxide and sodium bentonite. The rice hull ash reacts with the volcanic ash through physical filling to optimize micron-sized pores; nano-scale pores are filled with nano-silicon dioxide, cement hydration is accelerated, and the nano-silicon dioxide and the nano-silicon dioxide synergistically optimize the pore structure and promote densification of C-S-H gel. The sodium bentonite can retain water, thicken and improve the stability of the slurry. The cross-scale synergistic effect of the multi-scale silicon sources constructs a multi-level compact filling structure from nanometer to micrometer and a multi-level hydration reaction enhancing system in the grouting material, the compactness and anti-seepage performance of the material are remarkably improved, and the grouting material is suitable for engineering fields such as water conservancy dams, tunnels, deep mines, landfills and the like with extremely high anti-seepage performance requirements.

The invention belongs to the cross technical field of battery recovery and clay mineral modification, and particularly relates to a preparation method of an adsorbent for titanium metal in battery recovery leachate, the prepared adsorbent and application, and the preparation method comprises a three-step integrated modification process of sodium bentonite preparation through sodium modification pretreatment, iron pillared modification and titanium-based functional modification. The titanium metal adsorption function under the scene of the lithium iron phosphate battery acid leaching solution (pH = 0.8-1.5) is adapted, and the core problems that an existing adsorbent is low in titanium selectivity, the structure is prone to collapse under the strong acid environment, and active sites are prone to failure are effectively solved.

The present application aims at the pain points of subgrade settlement, pavement cracking and green maintenance difficulties caused by strong loess collapsibility and easy cracking and failure of traditional rigid anti-seepage layer in central median strip of loess area, and constructs an integrated collaborative anti-seepage structure of "base soil improvement layer + flexible composite anti-seepage core layer + gap self-repairing sealing layer + ecological drainage buffer layer". The structure takes sodium bentonite as the core functional material, utilizes its multiple characteristics of swelling when encountering water, thixotropic sealing, flexible anti-cracking and ion exchange to improve soil, realizes the modification of anti-collapsibility of base loess and the physical and chemical double blocking of subsurface water infiltration. The ecological drainage buffer layer can not only quickly dredge accumulated water, but also can bear green vegetation, realizing the integration of engineering protection and ecological landscape. The present application has stable structure, seepage self-repairing function, convenient construction and green durability, and can long-effectively solve the seepage and collapsibility diseases of central median strip of expressway in loess area, and has great value for improving the durability of highway and road environment.

The application discloses a kind of phosphogypsum road base water stable material and its construction method, by weight fraction, including calcined phosphogypsum 300~2000 parts, cement clinker 300~2000 parts, limestone 50~500 parts, toughening agent 1~10 parts, high-strength water-resistant agent 10~200 parts, sodium bentonite 50~100 parts, glass fiber 1~10 parts;The high-strength water-resistant agent is magnesium chloride, magnesium oxide, dimethyl chlorosilane is added with 1:1:0.05~0.5, the toughening agent is polyvinyl alcohol and EVA is mixed with 1:0.5~1 to form.The water stable material produced by using industrial by-product phosphogypsum calcined building gypsum as raw material has strong water resistance, high compressive strength and surface hardness, and is resistant to cracking caused by expansion;After premixing at construction site, road construction is carried out, the setting time meets the construction requirements, the water-soluble fluorine ion concentration of road surface is less than 3.50mg / L, water-soluble phosphorus pentoxide is not detected, the liquid leached under rainwater washing has no environmental pollution, the water stable material of the application enables the engineering of solid waste to be batched, and realizes the maximum resource utilization of phosphogypsum.

The invention discloses a coating device for preparing a sodium bentonite waterproof blanket, and relates to the technical field of coating, the coating device comprises a bottom plate, the top of the bottom plate is fixedly connected with two side plates, a discharging roller, a material blocking roller, a coating roller, a material conveying roller and a material receiving roller are rotatably connected between the two side plates, the material blocking roller is located between the material receiving roller and the discharging roller, and the material blocking roller is located between the material receiving roller and the discharging roller. The material conveying roller is located above the coating roller, the coating roller is located over the material blocking roller, one end of the material conveying roller, one end of the coating roller, one end of the material blocking roller, one end of the material discharging roller and one end of the material receiving roller are jointly provided with a transmission structure, and a drying structure is arranged between the two side plates. Even if the raw materials flowing out of the material leaking groove are uneven due to vibration of a machine, the raw materials on the surface of the material conveying roller can evenly flow to the surface of the coating roller in the attached state of the material conveying roller and the coating roller, and therefore the uniformity of the coating roller in the coating process is not affected by vibration.

The invention relates to the technical field of deodorization products, in particular to deodorization slow-release fragrance particles and a preparation method thereof. Comprising the following raw materials in parts by weight: 40-60 parts of natural zeolite, 10-20 parts of natural sodium bentonite, 10-20 parts of diatomite, 10-20 parts of attapulgite, 2-5 parts of quaternary ammonium salt, 2-5 parts of plant extract and 2-5 parts of fragrance microcapsules. The preparation method comprises the following steps: step 1, weighing all the raw materials in parts by weight; step 2, uniformly mixing natural zeolite, bentonite, diatomite and attapulgite in a dry manner, and putting the mixture into a granulation pot; step 3, slowly adding water into the granulation pot according to the mass ratio of the raw materials to the water of 10: (2.5-4), and slowly operating to form the mixture; step 4, adding quaternary ammonium salt, plant extract and fragrance microcapsules, continuously operating, and controlling the particle size to be 1-4mm; and step 5, drying at the temperature of 80-100 DEG C for 15-30 minutes or drying at the temperature of 45-60 DEG C for 180-240 minutes to obtain finished product particles. The plant extract is a soybean-based odor neutralizer.

This invention relates to the field of bentonite preparation technology, and in particular to an organically modified bentonite and its preparation method, comprising the following steps: (a) pretreatment of natural bentonite by sulfuric acid acidification and whitening; (b) sodium carbonate sodiumization to obtain sodium-based bentonite; (c) dispersion of sodium-based bentonite in anhydrous ethanol, addition of 3-aminopropyltriethoxysilane (APTES) and polyethylene glycol diacrylate (PEGDA), and reflux reaction at pH=4.0 to achieve silanization intercalation; (d) addition of 5% template agent, and hydrothermal construction of mesoporous-macroporous hierarchical channels at 120℃; (e) elution of template agent with ethanol / water mixed solvent, and drying and pulverizing to obtain the finished product. This method overcomes the defects of traditional bentonite in low mass transfer efficiency and insufficient macromolecular adsorption capacity, and can increase the adsorption capacity for organic pollutants by more than 40%, while enhancing the structural stability under high temperature and acidic environments.

This application discloses a method for preparing a waterproof and breathable membrane for outdoor clothing, relating to the field of clothing and apparel technology. The method includes the following steps: Step 1, spinning solution preparation: mixing and stirring a polymer resin with a solvent to prepare a spinning solution; Step 2, electrospinning: introducing the spinning solution obtained in Step 1 into an electrospinning machine, and obtaining a waterproof and breathable membrane preform through the spinning process; wherein the polymer resin includes TPU or PU, maleic anhydride-grafted chitosan and / or modified high-sodium bentonite, and phase change temperature-regulating microcapsules, and the maleic anhydride-grafted chitosan and / or modified high-sodium bentonite account for 3-12% of the mass of the polymer resin, and the phase change temperature-regulating microcapsules account for 20-42% of the mass of the polymer resin. This application achieves efficient and intelligent temperature control by combining maleic anhydride-grafted chitosan and phase change temperature-regulating microcapsules, thereby improving the compatibility of the phase change temperature-regulating microcapsules in the polymer resin and uniformly dispersing them in the polymer resin.

This invention discloses a method for preparing high-manganese steel plates by hot rolling after surface infiltration of TiC using a lost foam casting process. This invention combines lost foam casting, TiC infiltration, hot rolling, and water quenching. TiC particles are used as the reinforcing phase, and a coating is prepared using a special silica sol refractory binder and sodium-based bentonite suspending agent. Key processes include drying the TiC coating layer, re-drying after applying the lost foam refractory coating, negative pressure casting, hot rolling, and water quenching. Nickel and copper alloying elements are introduced into the matrix to achieve a good match between the infiltrated layer and the matrix. Through the synergistic effect of the components and processes, this invention enables the plate to possess both high surface wear resistance and matrix toughness. The infiltrated layer has a stable bond, and the process is highly controllable, thus improving the performance and service life of high-manganese steel plates under wear-resistant conditions.

The application discloses a high-efficiency wastewater mercury removal agent and a preparation method thereof, belongs to the field of wastewater mercury removal, and comprises 20-50 parts of inorganic particles, wherein the inorganic particles are at least one of bentonite, zeolite or molecular sieve, the surface of the inorganic particles is chemically modified by using 1-5 parts of a silane coupling agent, and then the surface is adsorbed by 1-10 parts of an organic thioamide reagent; the bentonite is calcium-based bentonite or sodium-based bentonite with a blue absorption capacity of 40-50 g / 100 g and an expansion ratio of 20-40, the zeolite is clinoptilolite or mordenite, and the molecular sieve is 3A or 4A molecular sieve; the silane coupling agent is at least one of gamma-aminopropyl triethoxysilane, gamma-glycidyl ether oxygen propyl trimethoxysilane, methacryloyl trimethoxysilane, 2-(3,4-epoxy cyclohexyl) ethyl trimethoxysilane and 3-mercapto propyl trimethoxysilane; and the organic thioamide reagent is one or both of thiosemicarbazide and dithizone.

The invention relates to the technical field of bentonite composite materials, in particular to an environment-friendly bentonite composite material and a preparation method thereof, and the environment-friendly bentonite composite material comprises the following components: sodium bentonite, modified montmorillonite and composite microspheres. When Ca < 2 + > invades, sodium carboxymethyl cellulose adsorbed between modified montmorillonite layers delays the diffusion rate of Ca < 2 + > to the layers, meanwhile, a gamma-PGA / Ca < 2 + > cross-linked coating on the outer layer of the composite microsphere releases Na < + > and sodium polyphosphate stored inside, and polyphosphate radicals and PDA-EDTA jointly chelate and fix Ca < 2 + >. Na < + > released by the composite microspheres is captured by crown ether of the modified montmorillonite in a high-selectivity manner, and Na < + > is supplemented between layers. The PDA-EDTA coating can enhance the interface stability, interface anchoring is formed between the outer surface of the modified montmorillonite and a sodium carboxymethyl cellulose chain segment, and a sodium carboxymethyl cellulose chain is prevented from falling off under flushing of percolating fluid.

The invention relates to a method for producing ferroboron pellets by precisely adjusting the roasting temperature, and belongs to the technical field of metallurgy. The method comprises the steps that magnetite powder and paigeite powder are mixed, and a pre-ingredient is obtained; mixing the pre-prepared material with sodium bentonite to obtain a mixed material; sequentially carrying out drying and screening treatment on the mixed material; carrying out compression molding on the screened mixed material to obtain a cylindrical sample; the 5% shrinkage rate temperature T5 and the 10% shrinkage rate temperature T10 of the cylindrical sample are obtained; acquiring a 5% shrinkage rate temperature T5 reference and a 10% shrinkage rate temperature T10 reference of the standard sample; and comparing the shrinkage rate temperature of the standard sample with the shrinkage rate temperature of the cylindrical sample, and adjusting the roasting temperature during production of the ferroboron pellets based on a comparison result. According to the method, accurate adjustment of the roasting temperature is achieved, and the produced ferroboron pellets are low in cost, stable in performance and suitable for a blast furnace ironmaking process.

The invention relates to a feeding self-healing agent, a preparation method thereof and application of the feeding self-healing agent in a self-adjusting cement-based material, and belongs to the technical field of civil engineering materials. In order to solve the problems of single function, uncontrollable reaction process and the like of the existing self-adjusting admixture for concrete, the invention provides a feeding self-healing agent. The expanding agent comprises the following components: a magnesium oxide type expanding agent and / or a calcium oxide type expanding agent, sodium bentonite and / or calcium bentonite, polyacrylamide and / or a sodium acrylate-acrylamide copolymer, and sodium alginate and / or calcium alginate. The self-adjusting cement-based material prepared from the feeding self-healing agent has the synergistic effect of shrinkage compensation and crack self-repairing, the volume stability of concrete can be remarkably enhanced, the durability of the concrete can be greatly improved, the concrete cracking problem can be effectively solved, the service life of an engineering structure can be prolonged, and the maintenance cost of the whole life cycle can be reduced; therefore, continuous economic value and social benefit are created.

The invention belongs to the technical field of building materials, and particularly relates to accelerator-free sprayed concrete as well as a preparation method and application thereof. According to the technical scheme, the accelerator-free sprayed concrete is prepared from cement, fly ash, silica fume, slag powder, sodium bentonite, stone powder, fine aggregate, coarse aggregate, an early strength agent, a viscosity modifier, an air entraining agent and a water reducing agent. The preparation method comprises the following steps: S1, dry-mixing the stone powder, the fine aggregate, the cement, the fly ash, the silica fume, the slag powder and the sodium bentonite to obtain a dry material; s2, dissolving an air entraining agent, an early strength agent and a viscosity modifier in water to obtain mixing water, putting the mixing water and a water reducing agent into the dry material, and stirring to form mortar; s3, the coarse aggregate is put into the mortar and stirred, a concrete mixture is obtained, spraying construction is carried out, and after spraying construction is carried out on the concrete mixture, the accelerator-free sprayed concrete is formed. The main purpose of the invention is to provide a new choice for the accelerator-free sprayed concrete and the preparation method thereof.

The application discloses a kind of salt fog resistant nano organic clay rheological agents and preparation method thereof.The rheological agent includes boehmite 8-15 parts, sodium bentonite 24-60 parts, quaternary ammonium salt 20-40 parts, silane coupling agent 1.5-4.8 parts, structure directing agent 1.5-4.5 parts, dispersant 0.1-0.3 parts by weight fraction.Preparation method includes boehmite nanocrystal hydrothermal synthesis, bentonite ultrasonic-high pressure homogenization synergistic exfoliation, quaternary ammonium salt ion exchange intercalation modification, in-situ composite assembly, silane coupling agent surface modification and product forming and other key steps.By the layered structure of boehmite nanocrystal and bentonite sheet layer form synergistic composite, after silane coupling agent chemical bonding modification, build stable organic-inorganic composite structure.The rheological agent shows excellent rheological regulation performance, salt fog corrosion resistance and environmental adaptability, suitable for harsh environment such as marine engineering rheological regulation application.

This invention discloses a method for treating bisphenol A type epoxy resin wastewater using calcium-based bentonite. The method includes the following steps: centrifuging bentonite powder N times (N=2~3) according to a centrifugation treatment method, collecting the calcium-based bentonite suspension and calcium-based bentonite; mixing the calcium-based bentonite suspension with the bisphenol A type epoxy resin wastewater, adding calcium-based bentonite to obtain a mixed solution; stirring the mixed solution at 50~90 °C, allowing it to stand, and centrifuging to obtain organically modified sodium bentonite with industrial application value and purified wastewater with COD emission levels meeting standards. This method significantly reduces the COD content of bisphenol A type epoxy resin wastewater, meeting the direct COD emission standard in the Chinese national standard GB 31572-2015 "Emission Standard of Pollutants for Synthetic Resin Industry". It requires no chemical modification agents, causes no secondary pollution, has mild reaction conditions, a simple process flow, and low production costs.