5068 results about "Acrylamide" patented technology

A fireproof magnesium oxide board is prepared by mixing the following raw materials, the raw material names and weight parts are as follows: 80-100 parts of magnesium oxide; 20-30 parts of anhydrous magnesium chloride; 10-20 parts of modified expanded vermiculite foaming agent; 20-30 parts of aluminum silicate fiber; 5-10 parts of sawdust; 10-15 parts of fly ash; 8-12 parts of glass magnesium board crushed powder; 1.5-5 parts of non-woven fabric; 10-20 parts of water; wherein the modified expanded vermiculite is prepared by the following steps: (1) Vermiculite is incompletely expanded and calcined; (2) acrylic acid monomer, sodium hydroxide, acrylamide monomer, initiator potassium persulfate, crosslinking aid pentaerythritol polyglycidyl ether, incompletely expanded vermiculite, and water are taken, stirred evenly and ultrasonically dispersed to obtain a first reaction solution, which is placed in a reactor for reaction to obtain a gel material; (3) the gel material is preliminarily crushed and dried, and then further crushed in a ball mill to obtain a fire-resistant expanded vermiculite with water absorption performance.

The invention relates to the technical field of fracturing fluids, and discloses a preparation method of a temperature-resistant and salt-resistant fracturing fluid, which comprises the following steps: carrying out polymerization reaction on acrylamide, acrylic acid and an acrylamide sulfonic acid monomer to obtain a polymer thickening agent, and compounding the polymer thickening agent with a cross-linking agent, a clay stabilizer and the like to obtain the temperature-resistant and salt-resistant fracturing fluid. The polymer thickening agent contains long-chain alkyl, a physical cross-linked spatial network structure can be formed through a hydrophobic association effect, the hydrodynamic volume is increased, a good tackifying effect is achieved, and after high-speed shearing, the long-chain alkyl can be cross-linked again to form a spatial network structure, so that a solution still keeps very high apparent viscosity, and the viscosity of the solution is improved. Good anti-shearing performance is realized. The acrylamide sulfonic acid monomer contains a sulfonate group and is used as a temperature-resistant and salt-resistant monomer, so that the polymer thickening agent has good temperature resistance and salt resistance, and the fracturing fluid still keeps relatively high apparent viscosity after being subjected to high-temperature heat treatment and in formation water with high salinity.

The invention discloses a self-crosslinking temperature-resistant salt-resistant emulsion type fracturing fluid thickening agent and a preparation method thereof, and belongs to the technical field of oilfield chemistry. The raw materials adopted by the invention comprise 30 to 50 parts of an oily solvent, 15 to 25 parts of deionized water, 10 to 20 parts of acrylamide, 5 to 10 parts of acrylic acid, 2 to 4 parts of 2-acrylamido-2-methylpropanesulfonic acid, 0.05 to 0.2 part of a crosslinking monomer, 0.5 to 1 part of a quaternary ammonium salt type hydrophobic association monomer, 4 to 8 parts of an emulsifier and 1 to 2 parts of a phase inversion agent. The self-crosslinking emulsion is formed through water phase-oil phase mixing, high-speed emulsification, low-temperature initiation polymerization and phase inversion treatment. Based on physical-chemical double-crosslinking temperature control cooperation, a salt-resistant-hydrophobic double-shielding mechanism and an integrated design without an exogenous crosslinking agent, the contradiction between the temperature-resistant and salt-resistant performance of a traditional thickening agent and the process complexity is broken through, and a technical support is provided for efficient development of high-temperature and high-salt oil and gas reservoirs.

The invention relates to the field of oil well opening and killing fluid production, in particular to a solid-free well killing fluid for shale oil reservoir and a preparation method of the solid-free well killing fluid. The solid-free well killing fluid for the shale oil reservoir comprises the following raw materials in parts by mass: 50-70 parts of water, 10-30 parts of a density regulator, 3-6 parts of a copolymer tackifier, 1-3 parts of a dispersant, 3-7 parts of a filtrate reducer and 2-4 parts of a corrosion inhibitor. The copolymer tackifier is obtained by initiating copolymerization by taking acrylamide, a quaternary ammonium salt-containing monomer, an unsaturated silane coupling agent and polyethylene glycol diacrylamide as monomer free radicals, and the dispersing agent comprises gas-phase nano silicon dioxide and a fluorine-containing surfactant. Through reasonable compatibility of all the components in the formula, especially the copolymer tackifier, the effect that one agent has multiple functions is achieved, and meanwhile the high temperature resistance, the corrosion inhibition performance and the clay stability of the well killing fluid are improved.

The invention relates to a flexible aqueous binder for a lithium battery negative electrode and a preparation method thereof. The preparation method comprises the following steps: firstly, preparing a flexible polyurethane prepolymer containing vinyl by taking hydroxyl-terminated polybutadiene, isocyanate and hydroxyl acrylate as main raw materials; vinyl-containing compounds such as water-soluble acrylic acid (salt) or acrylamide, oil-soluble acrylic ester or acrylonitrile and the like are used as monomers and are combined with a flexible polyurethane prepolymer to prepare the negative water-based binder with flexible cross-linking points through free radical polymerization. The aqueous binder prepared by the technical method provided by the invention can realize point-to-point and point-to-line bonding modes with a pole piece active substance on a microstructure, so that the bonding strength of the active layer material and a copper foil is improved on the premise of not influencing the electrolyte resistance of the binder; and the flexibility of the negative pole piece and the subsequent processing stability are obviously improved.

The invention provides a modified coal gangue-based large-flow-state grouting and water plugging material and a preparation method thereof. Comprising 80-90 parts of a coal gangue sample, 1-5 parts of Portland cement, 1-5 parts of sulphoaluminate cement, 0.51-3 parts of a polycarboxylic acid water reducing agent, 1-4 parts of cellulose ether with the viscosity of 200w, 0.1-5 parts of a calcium oxide expanding agent, 0.5-5 parts of a plastic expanding agent, 0.5-1 part of redispersible latex powder, 0.5-5 parts of polyacrylamide with the molecular weight of 1000 and water, and the water-material ratio is 0.4. According to the modified coal gangue-based large-flow-state grouting and water plugging material and the preparation method thereof, the cement consumption can be remarkably reduced, the cost is reduced, the utilization rate of solid wastes (such as coal gangue) is increased, and the material has good flow-state performance and adjustable setting time; the method is suitable for deep and large shaft surrounding rock water seepage treatment in coal mining and other mine engineering.

The invention relates to the technical field of papermaking, in particular to a papermaking filler wrapping agent and a preparation method and application thereof. The papermaking filler wrapping agent comprises a cationic polyester polyacrylamide emulsion and a high molecular weight water-soluble polymer. The papermaking filler wrapping agent has the advantages that the papermaking filler wrapping agent is insensitive to shearing action, the retention rate of filler such as calcium carbonate is high, the paper strength is not reduced, and produced paper products are good in batch stability.

The invention belongs to the technical field of crop genetic breeding, and relates to a linked molecular marker of a peanut hypocotyl elongation related gene locus, an identification method and application of the linked molecular marker. The primer pair is C2-15-F / R, and the sequence of the primer pair is as shown in SEQ ID NO. 1 and SEQ ID NO. 2; by designing an InDel marker C2-15, the peanut hypocotyl length character can be quickly distinguished by using a primer to amplify a target band and using polyacrylamide gel electrophoresis detection. The identification method is more accurate and convenient, has good repeatability, can efficiently distinguish the phenotype and genotype of an individual, shortens the experiment process, has the advantages of simple and feasible operation steps and the like, and saves expenditure. The method disclosed by the invention has important application value in the breeding work aspects such as peanut hypocotyl elongation character related gene positioning, genotype typing and later cultivation of excellent peanut varieties.

The invention relates to the field of zinc ion batteries, in particular to a disaccharide eutectic gel electrolyte and a preparation method and application thereof. The preparation method of the disaccharide eutectic gel electrolyte comprises the following steps: firstly, adding disaccharide, choline compounds and zinc sulfate into deionized water, heating and uniformly stirring, then adding a polyacrylamide monomer as well as a thermal initiator and a cross-linking agent which are adaptive to a polymerization reaction with the monomer, and carrying out thermal initiation to form the disaccharide eutectic gel electrolyte. According to the invention, two additives, namely disaccharide and choline, are ingeniously introduced into the traditional gel electrolyte, and the two additives can form the stable disaccharide eutectic gel electrolyte together in the heating and stirring process. According to the innovative strategy, a polyacrylamide hydrogen bond network is enhanced, the cycle performance of the gel electrolyte battery is greatly improved, the configuration entropy of the system is increased due to introduction of the multi-component additive, the problem that an existing gel zinc battery is low in cycle performance is solved, and application of the gel zinc battery in a harsh temperature environment becomes possible.

The invention discloses a wearable medical monitoring equipment electrode which is composed of a layered structure and comprises a transparent flexible substrate layer which is made of a biocompatible flexible polymer material and is used for providing flexible support and isolating a metal electrode from the skin; the metal grid copper transparent electrode layer is formed on the surface of the transparent flexible substrate layer through a yellow light etching micro-nano processing technology; the conductive gel layer uniformly covers the surface of the metal grid copper electrode layer; the encapsulation layer is formed by spin-coating a polymethyl methacrylate solution on the surface of the conductive gel layer and forming a transparent protection layer after curing; the gradient line width bionic honeycomb-shaped copper grid design is adopted, the light transmittance is kept, meanwhile, the collection efficiency of physiological electric signals is remarkably improved, signal transmission loss is reduced, through the polyacrylamide and nanocellulose composite gel formula and micro-channel dynamic humidity adjustment, signal stability under long-term wearing is ensured, and the application range is wide. The problem of signal distortion caused by dryness of traditional gel is solved.

The invention belongs to the technical field of drilling fluid, and particularly relates to a free radical polymerization water-based drilling fluid composition and a preparation method thereof. The invention relates to a core-shell composite particle-containing water reducer which comprises deionized water, salts (NaCl / KCl), alkalis (Na2CO3 and NaOH), barium sulfate and core-shell composite particles X. The particle is composed of a silicon dioxide core and a polymer shell layer, and the shell layer is formed by free radical copolymerization of acrylamide, 2-acrylamido-2-methylpropanesulfonic acid and acrylic acid and is covalently connected with the core through silanization treatment. Under the conditions of high salinity, strong alkali and high solid phase weighting, the drilling fluid simultaneously realizes the following effects: (1) high-density bearing and low-viscosity pumpability are realized; (2) compact plugging and water loss reduction and low formation damage flowback can be realized; and (3) stable rheology rock carrying, lubrication and friction resistance reduction. The problem that three aspects of performance are difficult to consider in the prior art is solved, and the drilling fluid is suitable for drilling of deep wells, ultra-deep wells and complex stratums and has remarkable industrial application value.

The invention provides loofah sponge nanocellulose hydrogel and a preparation method thereof.The preparation method comprises the following steps that anhydrous citric acid, choline chloride and water are mixed to react, and a ternary eutectic solvent is obtained; dispersing loofah sponge purified cellulose in a ternary eutectic solvent, washing and filtering a product to be neutral, dispersing the product in water, and performing ultrasonic treatment to obtain loofah sponge nanocellulose turbid liquid; dissolving sodium lignin sulfonate and lithium chloride in a sodium hydroxide solution to obtain a precursor solution; mixing the loofah sponge nanocellulose suspension with water, polyacrylamide, ammonium persulfate and N, N-methylene bisacrylamide, pouring the precursor solution into the loofah sponge nanocellulose suspension, uniformly stirring the mixture, pouring the mixture into a mold, and sealing the mold; and forming to obtain the loofah sponge nanocellulose hydrogel. The invention also provides an application of the hydrogel. The hydrogel disclosed by the invention has excellent biocompatibility, mechanical property and conductivity, has a wide application prospect in the field of flexible electronics, and is simple in preparation process, low in cost, green and environment-friendly.

The present invention relates to a flexible iron aluminate cement-based supercapacitor and a preparation method thereof. The flexible iron aluminate cement-based supercapacitor is assembled with rGO / Ni as the positive electrode, rGO@α-Fe2O3 spindle / Ni as the negative electrode, and polyacrylamide-cement-emulsion-latex powder-water-KOH as the flexible cement-based solid electrolyte. Compared with the prior art, the flexible energy storage cement-based material, as a new type of building material integrating structure / function, realizes the integration of flexible lightweight design and functional technology. Its flexible characteristics can closely fit complex-shaped buildings and have good adaptability to special-shaped curved building structures. At the same time, a non-destructive construction process can also be adopted, and the energy storage function can be imparted to the existing structure by an external pasting method, so that the energy storage function can be imparted without structural reconstruction.

A flame-retardant laminated solid wood composite floor and a manufacturing method therefor. The manufacturing method comprising: first reacting dopamine hydrochloride with acryloyl chloride to generate a dopamine acrylamide monomer; by means of a double bond in the dopamine acrylamide monomer, carrying out a click reaction with a phosphate monomer containing a sulfydryl group, so as to introduce a catechol group into a side chain of the phosphate monomer and obtain a flame-retardant monomer containing the double bond; and then mixing pentaerythritol tetra(3-mercaptopropionate), pentaerythritol triacrylate, perfluorodecanethiol and the flame-retardant monomer containing the double bond to obtain a photocurable coating material. The coating material is photocured after being coated on the surface of a wood veneer, thus effectively improving the flame-retardant performance of the wood veneer; moreover, the adhesion between the coating layer and the wood veneer is excellent. The wood veneers are laminated in multiple layers, are glued and assembled into a layered structure, and then hot-pressed to form the solid wood composite floor, thus improving the comprehensive performance.

The invention relates to the technical field of oil and gas field exploitation, and discloses a drag reducer for a multifunctional fracturing fluid and a preparation method thereof.The preparation method of the drag reducer for the multifunctional fracturing fluid comprises the steps that acrylic acid, acrylamide, 2-acrylamido-2-methylpropanesulfonic acid and modified itaconic acid are added into deionized water, stirring and mixing are conducted, and the drag reducer for the multifunctional fracturing fluid is obtained. Nitrogen is introduced for 30-40 min to remove oxygen, then azobis (isobutylamidine) hydrochloride is added, the mixture is stirred to react for 48-72 h at the temperature of 45-50 DEG C, and a polymer solution is obtained; and directly and uniformly mixing the polymer solution, the compatilizer and the modified nano silicon dioxide, and reacting in a magnetic stirrer at 60-70 DEG C for 1.5-2 hours to obtain the drag reducer for the multifunctional fracturing fluid. The drag reducer has a good drag reduction effect, and the hydrophobicity, the temperature resistance, the salt resistance and the shear resistance are improved.

The invention discloses a composite water purifying agent based on polyaluminum ferric sulfate. The preparation process comprises the following steps: 1, reacting ferrous sulfate heptahydrate, aluminum sulfate, sodium chlorate, phosphoric acid and the like to prepare a polyaluminum ferric sulfate solution; 2, mixing the modified polyacrylamide solution with the polyaluminum ferric sulfate solution for reaction to obtain a composite system; and step 3, adding acidic ochre soil into the composite system to obtain the composite water purifying agent. The preparation method has the beneficial effects that a modified monomer is prepared through organic synthesis, and the modified monomer is copolymerized with monomers such as acrylamide to prepare modified polyacrylamide; then, the organic polymer is compounded with a polyaluminum ferric sulfate solution and acidic ochre soil, and an inorganic-organic-mineral ternary water purification system is constructed; the composite water purifying agent has the high-efficiency electricity neutralization capability of an inorganic flocculating agent, the bridging flocculation effect of organic macromolecules and the adsorption performance of minerals, and shows excellent flocculation and sedimentation effects and pollutant removal capability.

The invention discloses a preparation method of a cell inflammatory factor adsorbent, which comprises the following steps: mixing styrene, divinyl benzene and hydroxyethyl acrylate, and adding a pore-foaming agent and mesoporous SiO2 nano powder to prepare a porous microsphere carrier; the preparation method comprises the following steps: mixing chitosan and poly (N-isopropylacrylamide) in an acetic acid solution to obtain a temperature-sensitive chitosan hydrogel precursor solution; the preparation method comprises the following steps: activating the surface of a porous microsphere carrier by using 1-ethyl-(3-dimethylaminopropyl) carbodiimide and N-hydroxysuccinimide, mixing the activated porous microsphere carrier and a temperature-sensitive chitosan hydrogel precursor solution to obtain a water phase, and assembling, washing and drying in an oil phase to obtain the cell inflammatory factor adsorbent. Through the design of the core-shell structure and the addition of the mesoporous SiO2 nano powder, the temperature response characteristic and the recyclable characteristic are given to the cell inflammatory factor adsorbent, the adsorption capacity of cell factors is also improved, and a new solution is provided for physical adsorption of the cell inflammatory factors.

A method of making an absorbent structure including mixing ultra-high molecular weight (“UHMW”) glyoxalated polyvinylamide adducts (“GPVM”) and / or high molecular weight (“BMW”), glyoxalated polyacrylamide and / or high cationic charge glyoxalated polyacrylamide (“GPAM”) copolymers and high molecular weight (“BMW”) anionic polyacrylamide (“APAM”) with the furnish during stock preparation of a wet laid papermaking process.

The invention discloses a composite polyacrylamide flocculant based on a nano core-shell structure as well as a preparation method and application of the composite polyacrylamide flocculant. The composite polyacrylamide flocculant is a core-shell structure composite material which takes inorganic nanoparticles grafted with carbon-carbon double bonds on the surface as a core and takes a polyacrylamide copolymer as a shell; the polyacrylamide copolymer is prepared from the following components in parts by mass: 70 to 90 parts of acrylamide, 10 to 30 parts of functional monomer and 0.1 to 1.0 part of cross-linking agent. The basic conception of the flocculating agent provided by the invention is that the structural design of inorganic nano core-organic polymer shell is adopted, PAM molecular chains firmly grow on the surfaces of nano particles in a chemical grafting manner, high dispersion and functional synergy of nano units are realized, and the obtained product has the characteristics of high flocculation speed, dense floc, high removal efficiency and the like, and has a wide application prospect. The method is especially suitable for deep treatment of difficult-to-treat industrial wastewater such as oil-containing wastewater, dye wastewater and heavy metal wastewater.

The invention belongs to the technical field of battery dressings, and particularly relates to a wearable magnesium battery self-powered dressing for chronic wound healing and a preparation method and application thereof. A flexible conductive carbon cloth coated with a viologen-based covalent organic framework material is used as a battery positive electrode, a magnesium sheet is used as a negative electrode, polyacrylamide hydrogel is used as a solid electrolyte, and the flexible wearable self-powered dressing is assembled. The formed electrode can effectively input electrical stimulation to the wound surface, the dressing can simulate an endogenous electric field in the wound, induce migration of fibroblasts, regulate the immune microenvironment of the wound and inhibit inflammatory response, polyacrylamide is used as gel electrolyte, and the dressing has good hygroscopicity, can absorb exudate at the wound surface and keep a wet healing environment, and can be applied to the wound healing. The chronic wound healing of the rat is effectively promoted. The self-powered dressing prepared by the invention provides a reliable electrotherapy method for chronic wound healing.

The invention relates to the technical field of concrete, and particularly discloses super-retarded concrete for an ultra-large pile and a preparation method of the super-retarded concrete. The super-retarding concrete for the ultra-large pile is prepared from the following raw materials in parts by mass: 320 to 400 parts of a cementing material, 1820 to 1960 parts of aggregate, 20 to 28 parts of an inorganic-organic hybrid retarding reinforcing agent, 7.2 to 11.6 parts of a polycarboxylate superplasticizer and 85 to 98 parts of water, the inorganic-organic hybrid delayed coagulation enhancer is prepared by carrying out in-situ free radical polymerization reaction on a hydroxyl acrylate monomer, acrylamide and nano silicon dioxide. According to the inorganic-organic hybrid retarding reinforcing agent, a hybrid substance is formed through a chemical bond, an organic phase is chelated with calcium ions to realize retarding and does not excessively inhibit cement particles, inorganic phase nano silicon dioxide has no agglomeration risk, gaps are filled, a stable product is generated to resist alkali erosion, and the super retarding performance and the long-term strength of concrete are both considered; and the service life of the ultra-large pile is prolonged.

The invention discloses an all-solid-state composite dry conductive agent and a preparation method thereof, and belongs to the technical field of batteries. The all-solid-state composite dry conductive agent is prepared by the following steps: uniformly mixing carbon nanotubes, high-dispersion carbon black and graphene to obtain a primary mixture; then preparing a uniformly dispersed glue solution from the composite dispersant and water; and then adding the primary mixture into the glue solution, uniformly mixing, sanding, homogenizing, drying and crushing to obtain the product, the high-dispersion carbon black is obtained by oxidizing carbon black to form active groups such as carboxyl and hydroxyl on the surface of the carbon black, halogenating acyl and then reacting with lithium 2, 5-diaminobenzene sulfonate. The preparation method comprises the following steps: grafting histidine ester into carboxymethyl cellulose by using propylene glycol diglycidyl ester as a cross-linking agent, then introducing allyl-1, 3-sultone, then copolymerizing with lithium 2-acrylamido-2-methylpropanesulfonate and 3-aminobenzoic acid allyl ester protected by fluorenylmethoxycarbonyl, and then deprotecting to obtain the composite dispersant.

The invention relates to the technical field of lithium battery negative electrode binders, in particular to a two-component negative electrode binder and a using method thereof.The two-component negative electrode binder comprises a component A and a component B. The component A is formed by copolymerization of acrylamide substances, fluorinated acrylate substances and acrylic acid, and the component B is formed by copolymerization of fluorinated acrylate substances and acrylic acid. The component B is formed by copolymerizing acrylic acid, acrylate, a fluorinated acrylate substance, an acrylamide substance and sulfydryl acrylate, and the component A accounts for 30wt%-70wt% of a mixture of the component A and the component B during use; when the adhesive is used for preparing the negative electrode slurry, a glue solution A and a glue solution B are prepared respectively, the glue solution A is added after the solid raw materials are subjected to dry mixing, the glue solution B is added after the solid raw materials are fully stirred, and finally the leveling aid is added. The two-component negative electrode binder provided by the invention has both rigidity and softness, strong binding power with a main material, strong self-adaptive expansion capability, high release force retention rate after long circulation, and good interface stability.

The invention provides a diaphragm and a preparation method thereof and a lithium ion battery, the diaphragm comprises a base membrane layer and a composite functional layer, the composite functional layer comprises hydrophobic SiO2 aerogel modified by a hydrophobic agent, a conductive ion polymer and a solid electrolyte, and the composite functional layer respectively accounts for 3-12wt%, 0.5-1.0 wt% and 0.5-1.5 wt% of the total mass of the diaphragm; the hydrophobic agent comprises trimethylchlorosilane, hexamethyldisilazane, perfluorooctyltriethoxysilane, polyvinylidene fluoride, polydimethylsiloxane and the like, the conductive ionic polymer comprises polyvinylpyrrolidone, lithium polymethacrylate, lithium polystyrene sulfonate, polyacrylamide and the like, and the solid electrolyte comprises lithium lanthanum titanium oxide, lithium lanthanum zirconium oxide, lithium lanthanum zirconium tantalum oxide and the like. The wettability is improved by the high porosity of the hydrophobic SiO2 aerogel, the stability and strong conductivity of a physical conductive network of the solid electrolyte and the ion affinity and amphoteric binding capacity of the conductive ion polymer are optimized, the electrochemical performance and thermal stability of the interface are optimized, and comprehensive optimization of the thermal-electric-interface performance of the diaphragm is realized through combination.

The application discloses a preparation method of a resistance / capacitance dual-response MXene-based hydrogel flexible sensor, and the hydrogel flexible sensor is prepared by combining a microstructure hydrogel prepared from polyacrylamide, gelatin and MXene with an interdigital electrode. The hydrogel flexible sensor can simultaneously detect resistance response signals and capacitance response signals. The detected resistance and capacitance signals are complementary to each other, the single response signal mode of the flexible sensor is widened, the mutual calibration of the same group of data is realized, and the detection precision of the flexible sensor is improved. The MXene-based hydrogel flexible sensor is applied to the detection of human biological signals, for example, carotid artery pulse detection and radial artery pulse detection.

The invention provides a modified chitosan flocculant for slime water treatment. The modified chitosan flocculant is prepared from the following raw materials: chitosan, dimethyl diallyl ammonium chloride, acrylamide, acetic acid and potassium persulfate. The invention also provides a preparation method of the modified chitosan flocculant for slime water treatment. The preparation method comprises the following steps: dissolving chitosan in a dilute acetic acid solution with the mass concentration of 60%, and stirring; adding acrylamide and dimethyl propyl chloride cyclic amine into the mixed solution, uniformly stirring, adding a potassium persulfate solution with the mass concentration of 4%, and introducing nitrogen for 20 minutes; then carrying out microwave reaction, and cooling to room temperature after the reaction is completed; adding absolute ethyl alcohol, centrifuging for 10 minutes, taking out, and continuously soaking in absolute ethyl alcohol for 12 hours, so as to obtain a final insoluble substance which is a graft polymer CS-g-ADM; and drying the polymer in a drying box at 105 DEG C until no weight loss occurs, and then grinding and storing. The flocculating agent disclosed by the invention has relatively good flocculability.

The invention relates to the field of fire resistance, in particular to a composite fiber reinforced refractory brick and a preparation method thereof.The composite fiber reinforced refractory brick is prepared from, by weight, 70-80 parts of mullite, 40-50 parts of quartz, 20-30 parts of alumina, 40-60 parts of magnesium aluminate spinel fine powder, 5-10 parts of silicon carbide powder, 1-5 parts of composite fibers and 0.5-1 part of sodium tetrapolyphosphate; wherein the composite fiber is composed of modified zirconium oxide fiber and magnesium metal fiber. According to the preparation method, zirconium oxide fiber dispersion liquid, hydroxyethyl methylacrylate and N, N-methylene acrylamide are subjected to cross-linking polymerization under the action of a silane coupling agent, an initiator and an emulsifier, macromolecular chains are loaded on the surfaces of zirconium oxide fibers, the macromolecular chains are taken as cross-linking points, the zirconium oxide fibers are mutually linked to form a cross-linked polymer, and the zirconium oxide fibers are uniformly dispersed in the cross-linked polymer. The two-dimensional zirconium oxide fibers are constructed into a three-dimensional network structure, and the modified zirconium oxide fibers are prepared. The composite fiber can significantly enhance the strength and mechanical toughness of the refractory brick.

The invention discloses a hydrogel wound dressing with a synergistic healing promoting function as well as a preparation method and application thereof. The preparation method comprises the following steps: 1, dissolving oxidized methacrylated hyaluronic acid and dopamine in deionized water to obtain a solution A; the preparation method comprises the following steps: dissolving N-isopropylacrylamide, a photoinitiator 2-hydroxy-2-methyl-1-(4-(2-hydroxyethoxy) phenyl)-1-acetone and a cross-linking agent N, N '-methylene bisacrylamide in deionized water to obtain a solution B; 2, mixing the solution A and the solution B to obtain a pre-gel solution; or dissolving polyphenylboronic acid ester nanoparticles or polyphenylboronic acid ester-kaempferol with deionized water to obtain a solution C, and mixing the solution C with the solution A and the solution B to obtain a pre-gel solution; and 3, injecting the pre-gel liquid into a mold, and illuminating to obtain the hydrogel wound dressing loaded with the nanoparticles. The hydrogel disclosed by the invention can be used for effectively solving various problems in a wound healing process and promoting rapid and high-quality healing of a wound.

The invention relates to the technical field of molecular markers, in particular to an Indel molecular marker related to yellow leaves of a melon seedling growing point and application of the Indel molecular marker. The invention explores a key candidate gene MELO3C016136 for controlling the leaf color of the growth point of the muskmelon seedling, and develops an Indel molecular marker ygp2 for identifying the leaf color change of the growth point of the muskmelon seedling based on the key candidate gene MELO3C016136. The molecular marker ygp2 can be used for identifying the leaf color change character of the growth point of the muskmelon seedling, only one-time PCR amplification and polyacrylamide gel electrophoresis need to be carried out on the DNA of the plant to be detected, the identification result is reliable, the genotype of the target plant can be simply and conveniently identified, and the genotype identification result is completely consistent with the leaf color phenotype of the growth point of the seedling; important technical support is provided for creating new muskmelon germplasm with yellow seedling growing point leaves.

The invention belongs to the technical field of bottom plate mudstone treatment, and particularly relates to a rapid reinforcing material and method for bottom plate mudstone. The rapid reinforcing material for the bottom plate mudstone comprises the following components in parts by mass: a material A: 40-60 parts of sulphoaluminate cement, 15-40 parts of Portland cement and 1-2 parts of a naphthalene water reducer, and further comprises an initiator, a cross-linking agent and a redox agent; and a material B: 80-100 parts of gypsum, 10-30 parts of acrylamide and 2-4 parts of an aluminate coupling agent. According to the rapid reinforcing material for the bottom plate mudstone, the on-site argillization bottom plate can be hardened on site, a bottom plate hardening layer meeting the bearing condition is formed, the labor cost and the time cost caused by cleaning of bottom plate argillization substances are reduced, the passing smoothness is guaranteed, the project progress is accelerated, and the project benefits and the economic benefits are improved.