71 results about "Crosslinking reagent" patented technology

The application provides a flexible plugging agent for offshore oil and gas drilling fluid and a preparation method and application thereof, and belongs to the technical field of offshore oil and gas drilling and production. The plugging agent is prepared from the following raw materials: styrene, N-phenylmaleimide, 2-acrylamido-2-methylpropanesulfonic acid, sodium p-styrenesulfonate, 2-methacryloyloxyethylphosphorylcholine, a crosslinking agent, an initiator, a hydrophilic emulsifier, an oleophilic emulsifier and water. The plugging agent has excellent structural stability, heat resistance, salt resistance and hydration stability, has good adaptability to a low-density drilling fluid system, has a flexible deformation capacity, can effectively enter a complex leakage passage to achieve effective plugging, and can maintain the integrity and stability of a plugging layer under drilling fluid circulation shearing, temperature fluctuation and complex downhole conditions, thereby having applicability in a high-temperature and high-pressure drilling environment.

This utility model belongs to the field of oil and gas extraction technology, and discloses a measuring device and a rotational rheometer for detecting the salt resistance of crosslinking agents. The measuring device for detecting the salt resistance of crosslinking agents includes a housing, a cover, a rotating assembly, and a liquid injection assembly. The housing is fitted into a supporting groove and has a communicating receiving chamber and a liquid injection channel, the liquid injection channel being located on the side wall of the housing. The cover is detachably fastened to the housing and has a through hole. The rotating assembly is located in the receiving chamber, and one end is rotatably mounted vertically in the through hole. The rotating assembly is connected to the output end of the rotational drive mechanism of the rotational rheometer. The liquid injection assembly includes a storage container, a liquid injection pipeline, and a liquid injection mechanism. One end of the liquid injection pipeline is connected to the storage container, and the other end is connected to the liquid injection channel. The storage container is used to store brine, and the liquid injection mechanism is located on the liquid injection pipeline. Using this measuring device to detect fracturing fluids can reduce the workload of workers and improve work efficiency.

The application discloses a low-smoke halogen-free insulating material and a preparation method and application thereof, and relates to the field of cable materials. The low-smoke halogen-free insulating material comprises ethylene-vinyl acetate copolymer, polyethylene, modified flame retardant, polydopamine-coated ceramic oxide, antioxidant, crosslinking agent and processing aid, and the modified flame retardant is a flame retardant treated by bis(dioctyloxyphosphato) ethylene titanate. The application uses the modified flame retardant with low filling amount and the polydopamine-coated ceramic oxide to synergistically improve the flame-retardant and smoke-suppressing performance of the insulating material. The modified flame retardant is decomposed to generate oxides under heat to form an oxygen-blocking dense physical barrier. The polydopamine-coated oxides are heated to form a tough and stable heat-insulating ceramic-carbon composite layer. The modified flame retardant with low filling amount improves the compatibility and processing performance of the matrix, and comprehensively improves the flame retardation and mechanical strength of the material.

The application belongs to the technical field of starch chemical modification, and particularly relates to a preparation method of acetylated distarch phosphate. The method comprises the following steps: mixing starch with a deep eutectic solvent composed of choline chloride, glycerol and a small amount of water, adding a phosphate crosslinking agent and a delayed-release alkalizing agent for crosslinking reaction after pH adjustment, performing acetylation reaction by adding acetic anhydride or vinyl acetate after cleaning by alcohol solvent replacement, and finally obtaining the product through neutralization, washing, dehydration and drying. The process utilizes the deep eutectic solvent to control water activity and particle structure, and combines the slow-release alkali source to maintain a stable reaction environment, so that the crosslinking and acetylation are uniformly carried out, and the side reactions and residual salt load are effectively reduced. The obtained acetylated distarch phosphate has stable substitution degree, uniform particle structure and excellent performance in freeze-thaw stability, and is suitable for multiple fields such as papermaking, textile and oil field additives.

The application discloses a kind of SBS modified asphalt based on TAIC-MMA copolymer regeneration and preparation method thereof, belong to road engineering material field, include: S1: after aging asphalt is preheated at 135 ℃, under the first shear condition, incorporate ESO, continue 10-15min to induce nucleophilic ring-opening reaction of epoxy group in ESO and carbonyl in aging asphalt;S2: continue to incorporate TAIC / MMA mixture under the second shear condition, after stirring at 135 ℃ for 20 minutes, initiator BPO is added, continue to stir to make the free radical produced by decomposition of BPO initiate in-situ copolymerization and dynamic crosslinking reaction of TAIC and MMA;S3: the mixture obtained in S2 is carried out heat swelling at 70 ℃, namely obtained.The application uses ESO as colloidal stabilizer, uses triallyl isocyanurate as the crosslinking agent of SBS network structure reconstruction, uses the ester group side chain in MMA to enhance the interfacial compatibility with asphalt matrix by steric hindrance effect, by molecular level synergistic effect, finally realize the comprehensive promotion of aging asphalt cement rheological property, durability and mechanical property.

This invention belongs to the field of biomaterials technology and discloses a two-component in-situ crosslinking agent, a biodegradable two-component hydrogel, and their applications. The two-component in-situ crosslinking agent disclosed in this invention has injectability and rapid gelation properties. The hydrogel formed after crosslinking has a low self-swelling rate, good elasticity, and is not easily crushed. It also has a suitable metal ion slow-release cycle and degradation cycle for preventing tissue adhesion or tissue repair. It is especially suitable for high-risk areas of postoperative adhesion such as the uterine cavity, abdominal cavity, and joints, and can also promote tissue regeneration.

This invention belongs to the field of drilling engineering technology, specifically relating to a nanofiber-reinforced foam system for foam drilling fluid and its preparation method. The nanofiber-reinforced foam system for foam drilling fluid includes a gas phase and a liquid phase. The liquid phase comprises the following raw material components by mass percentage: 0.3-0.8 wt% foaming agent, 0.3-1.0 wt% nanofibers, and the balance being water. The foaming agent is prepared by in-situ polymerization of sodium isomeric tridecyl alcohol polyoxyethylene ether carboxylate and fatty acid methyl ester ethoxylate, followed by the introduction of hydrophilic monomers and crosslinking agents, using ammonium persulfate as an initiator. This invention's system exhibits high temperature and high salinity resistance, strong foam stability, and solves the problems of poor stability, insufficient temperature and salt resistance, high cost, and poor environmental performance of existing foam drilling fluids, achieving intelligent matching of foam performance with formation conditions.

The application relates to the technical field of repairing materials, and particularly discloses a quick repairing material for a mine conveying belt and a preparation method thereof. The quick repairing material for the mine conveying belt comprises components A and B, and the preparation raw materials of the component A include the following components in parts by weight: polyether polyol 30-50 parts and diphenyl methane diisocyanate 45-80 parts; the preparation raw materials of the component B include the following components in parts by weight: terminal amino polyether 30-50 parts, chain extender 20-40 parts, crosslinking agent 5-10 parts, modified flame retardant 5-10 parts, antistatic agent 1-5 parts and auxiliary agent 1-5 parts; wherein the flame retardant is one of a metal organic framework flame retardant, a metal organic framework flame retardant modified by a phosphorus-based flame retardant and a metal organic framework flame retardant modified by a reaction type DOPO-based flame retardant. The spraying type quick repairing material provided by the application can ensure the physical and chemical properties of the material, and improve the flame retardant property and stability of the material.

This application discloses an aerogel interfacial evaporator, its preparation method, and its applications. The preparation method includes: taking chitosan and preparing a chitosan solution; mixing anionic polyelectrolytes and a structural stabilizer to prepare a mixed solution; slowly adding the mixed solution dropwise to the chitosan solution to form a composite solution; adding a photothermal conversion material to the composite solution to form a suspension; injecting the suspension into a pre-cooled mold and freezing the mold to solidify the suspension; subsequently, vacuum drying the solidified suspension to obtain an aerogel with a porous structure; immersing the aerogel with the porous structure in a solution containing a crosslinking agent for reaction; after crosslinking is completed, cleaning and drying the aerogel to obtain the aerogel interfacial evaporator. The aerogel interfacial evaporator disclosed in this application has multiple effects, such as improving evaporation efficiency, inhibiting salt crystallization, and enhancing evaporator stability, and has broad application prospects in seawater desalination, wastewater treatment, and other fields.

The present invention provides a supramolecular hot melt adhesive. The present application also provides a method for preparing a supramolecular hot melt adhesive, comprising the steps of: A) dissolving a diol oligomer or diamine oligomer in a solvent, and reacting the mixture with diisocyanate under the action of a catalyst to obtain an initial reactant; B) mixing 2-amino-4-hydroxyl-6-methylpyrimidine, the initial reactant and a solvent for reaction; C) reacting the reactant obtained in step B) with a multifunctional crosslinking agent to obtain the supramolecular hot melt adhesive. The preparation method of the present invention constructs a supramolecular material with excellent strength, toughness and self-healing ability by a synergistic effect of multiple hydrogen bonds between carbamate or ureido group and pyrimidine group. The effective control of performance of materials can be realized by changing the chemical composition of supramolecular arms, the content of single-capping agent and the functionality of cross-linking agent.

This invention provides a modified crosslinking agent and a fast-curing, heat-resistant, alcohol-free silicone sealant, along with its preparation method. The invention uses a triaminobenzene-containing compound substrate and isocyanate-based trimethoxysilane as raw materials to synthesize a modified alkoxy crosslinking agent containing three urea groups. This crosslinking agent is then combined with α,ω-dihydroxypolydimethylsiloxane, inorganic fillers, a crosslinking agent, a catalyst, and a coupling agent in an alcohol-based system to prepare an alcohol-free silicone sealant. Compared to existing systems, the silicone sealant prepared using this invention exhibits improved curing depth and heat resistance while maintaining good mechanical properties, with a partial increase in mechanical strength. This addresses, to some extent, the increasing demands for heat resistance and curing speed in industrial and construction sectors for silicone sealants, expanding the application scenarios of alcohol-free silicone sealants and significantly improving their application performance and service life in high-temperature environments.

This invention provides a formaldehyde-free flame-retardant solid wood composite flooring and a modified lignin-based flame-retardant adhesive. The flame-retardant adhesive comprises 20-30 parts by weight of ethanol lignin, 20-30 parts by weight of hydroxide, 10-20 parts by weight of phytate, 30-60 parts by weight of crosslinking agent, 30-50 parts by weight of high-temperature soybean meal powder, and 0.1-0.2 parts by weight of tackifier. The invention also provides a preparation method. First, amino-rich hydroxide and phytate are grafted onto ethanol lignin to obtain hydroxide / phytate ethanol lignin. Next, the obtained hydroxide / phytate ethanol lignin is mixed with the crosslinking agent and high-temperature soybean meal powder. Finally, the tackifier is added, and the mixture is mechanically stirred to prepare the modified lignin-based flame-retardant adhesive. The flame-retardant adhesive provided by this invention is formaldehyde-free, exhibits excellent flame-retardant properties, good coating performance, good water resistance, and great application potential.

The application discloses an environment-friendly anti-dissolution gel foam extinguishing agent, which is composed of a foaming agent, a gelling agent, a crosslinking agent and a flame retardant, wherein the foaming agent is alkyl polyglycoside APG0810, the gelling agent is kappa-carrageenan, the crosslinking agent is gluconolactone, and the flame retardant is tributyl phosphate. Compared with existing foam extinguishing agents, the anti-dissolution gel foam extinguishing agent has longer storage stability, fewer component types, better anti-dissolution and better extinguishing performance. In addition, the anti-dissolution gel foam extinguishing agent has lower manufacturing cost, simple preparation process and is more convenient for large-scale industrial production.

This invention discloses a bifunctional small-molecule PEG-modified recombinant humanized collagen and its preparation method. The method includes the following steps: preparing a borate buffer solution containing sodium cyanoborohydride, pH 7.5-8.5; dissolving lyophilized recombinant collagen powder in the buffer solution to obtain a substrate solution; adding crosslinking agent powder to the substrate solution according to a molar ratio of free lysine to crosslinking agent of 1:(1.5-4.0); the crosslinking agent is a bifunctional small-molecule PEG with PEG as the backbone and groups at both ends that can couple with the amino groups of collagen; reacting at 4°C in the dark for 2-5 hours. This invention not only overcomes the bottleneck of anti-enzymatic stability but also transforms recombinant humanized collagen into a multi-arm macromolecular crosslinking substrate with highly active groups on its surface, providing key chemical bonding sites for its subsequent targeted coupling or anchoring to polymer networks such as hydrogels.

The application discloses a kind of lignin porous microspheres loaded with metal nanoparticles and its preparation method and application.The alkali lignin solution is mixed with crosslinking agent, chain extender homogeneous aqueous solution as water phase, mixed with internal oil phase containing surfactant, emulsified, and O / W primary emulsion is formed;Then the primary emulsion is mixed with external oil phase containing surfactant, emulsified, and O / W / O type complex emulsion is obtained;Then the crosslinking reaction is completed under ultrasonic, and after the reaction is finished, the oil phase is removed, and after washing, lignin porous microspheres are formed;Finally, the lignin porous microspheres are suspended and dispersed in the aqueous solution containing metal ions, and after heating or ultrasonic reaction, the lignin porous microspheres loaded with metal nanoparticles are obtained by separation and drying.The application has good balling effect, controllable particle size, rich surface and internal pore;The microspheres have good biocompatibility, biodegradability, better catalytic performance, and are suitable for bed layer catalysis, and have great application potential.

The application discloses a preparation method and application of microneedles for repairing radioactive skin damage, and adopts a physical crosslinking method to prepare the microneedles, thereby avoiding residues of organic solvents and small molecule crosslinking agents and having good biocompatibility and degradability. The microneedles can penetrate the cuticle of the skin to accurately deliver drugs to the epidermis, rapidly gel in the skin and realize programmed release of the drugs: firstly, mangiferin is released to remove active oxygen generated by radiation burst and prevent oxidative DNA damage; and then, keratin nanoparticles are continuously released to inhibit inflammatory reactions by regulating the NF-kappa B signal pathway, simultaneously play an anti-apoptosis role and up-regulate the expression of cell keratin, thereby promoting barrier reconstruction and hair follicle regeneration. The microneedle system realizes early-stage antioxidant prevention, late-stage anti-inflammatory and anti-apoptosis and regeneration-promoting phased synergistic treatment, has the effects of removing active oxygen, inhibiting inflammation, resisting cell apoptosis and promoting epidermal regeneration, and can significantly improve the repair efficiency of radioactive skin damage.

The application relates to the technical field of medical materials, and discloses a hemostatic gel and a preparation method thereof. The hemostatic gel provided by the application comprises the following raw materials in parts by weight: modified chitosan 20-40 parts, hydrated gelatin particles 35-45 parts, fatty acid salt vesicles 5-20 parts, and a crosslinking agent 1-5 parts. The hemostatic gel takes modified chitosan as the main body, combines the hydrated gelatin particles and the fatty acid salt vesicles to form a ternary synergistic system, and is matched with the crosslinking agent, so that the uniformity and mechanical stability of the gel are ensured, the problem of insufficient hemostatic efficiency caused by single component of a traditional hemostatic agent is overcome, and the hemostatic gel has good biocompatibility and degradability, and is especially suitable for a hemostatic application scene of bleeding in a narrow anatomical space or a high-risk part.

This invention relates to a dopamine hydrochloride-modified sodium alginate hydrogel, its preparation method, and its application. The preparation method of the dopamine hydrochloride-modified sodium alginate hydrogel includes: 1) dissolving sodium alginate in water, adding EDC and NHS, and stirring until the carboxyl groups of sodium alginate are activated; 2) adding dopamine hydrochloride and stirring at room temperature until the reaction is complete; 3) adding excess ethanol to the reaction mixture, centrifuging to precipitate, and lyophilizing to obtain dopamine-modified alginate; 4) dissolving the dopamine-modified alginate in a buffer solution with pH 6.5-7.5, adding a crosslinking agent, stirring evenly, and then allowing it to stand at 4°C for crosslinking; 5) washing the crosslinking product with a buffer solution to obtain the dopamine hydrochloride-modified sodium alginate hydrogel. This preparation method simplifies experimental steps and shortens experimental time while increasing the actual degree of substitution of dopamine hydrochloride to 54.3%.

The application provides a graphene oxide hydrogel for treating rotator cuff injury and a preparation method thereof, and relates to the technical field of medical materials. The preparation method comprises the following steps: uniformly dispersing graphene oxide into water to form a graphene oxide suspension; dissolving a water-soluble synthetic high-molecular skeleton material in water to obtain a skeleton material solution, and then adding a pore-forming auxiliary agent to form a mixed solution after dissolution; and sequentially adding the graphene oxide suspension, an anion crosslinking agent and a solution stabilizer into the mixed solution, and then uniformly mixing, cooling to room temperature, low-temperature freezing and freeze-drying to obtain the graphene oxide hydrogel. In-vivo evidence is provided, which proves for the first time that the above material can promote microfracture treatment of rotator cuff injury and significantly enhances tendon-bone healing in a rat model. A transformable combination strategy is verified, which directly solves the limitation of microfracture lacking of a support, and provides a promising method for improving rotator cuff repair.

This invention relates to a method for preparing iodine adsorbent materials using chromium leather scraps. The method uses chromium leather scraps as raw material, which are activated with alkali at 20-60°C for 2-10 hours. Then, a nitrogen-containing modifier and a dialdehyde crosslinking agent are added to the activated chromium leather scrap dispersion, and the mixture is stirred at 20-60°C for 4-12 hours. After filtration and drying, the iodine adsorbent material is obtained. This method grafts nitrogen-containing groups onto the collagen fibers of chromium leather scraps via a Schiff base reaction using a dialdehyde crosslinking agent, endowing them with a large number of active sites, giving them good adsorption capacity and stability, and enabling efficient adsorption in various iodine pollution scenarios (gaseous iodine, aqueous iodine). This method not only solves the problem of chromium leather scrap disposal but also provides a low-cost solution for the treatment of radioactive iodine pollution, aligning with the circular economy and green development concept of "using waste to treat waste." The process of this invention is simple, with no toxic reagent emissions, readily available and inexpensive raw materials, and is easy to scale up.

The application discloses a kind of super-sensitive dual-response fluorescence imine materials and its preparation method and application in gaseous iodine fluorescence detection, comprising: using anhydrous ethanol to soak sponge matrix, ultrasonic oscillation, wash impurities, dry.The dialdehyde monomer and azo type diamine monomer are added in organic solvent, oscillation after mixing, to obtain precursor solution;Crosslinking agent dissolved in organic solvent is added to precursor solution, ultrasonic constant volume, shake uniformly after standing, to obtain functional reagent;Sponge matrix is soaked in functional reagent, ultrasonic extrusion expels bubble in sponge matrix, and the sponge matrix soaked in functional reagent is dried, to obtain super-sensitive dual-response fluorescence imine material.The super-sensitive dual-response fluorescence imine material prepared by the application has super-sensitive dual-switch response for gaseous iodine fluorescence detection, can realize ultrafast early warning and quantitative detection to gaseous iodine leaked in nuclear energy utilization process, is portable and easy to operate, and has great commercial value.

This invention provides a copper-bismuth catalyst with both high activity and wear resistance, its preparation method, and its application, belonging to the field of catalyst material technology. The invention first prepares a copper-bismuth precursor I and a second precipitate, which are then mixed with trace amounts of inorganic seeds and subjected to a second aging process. The inorganic seeds serve as anchoring points for crosslinking, guiding the selective binding of subsequent inorganic composite crosslinking agents. This facilitates the formation of a three-dimensional structure—a core-shell structure, inorganic seeds, and a crosslinking network—as a support system, improving the mechanical stability of the prepared copper-bismuth catalyst, resulting in copper-bismuth precursor II. This precursor is then mixed with deionized water, followed by slurrying and spray granulation to obtain the initial catalyst product. This product is then impregnated in an inorganic composite crosslinking agent solution and subjected to low-temperature crosslinking, resulting in a solidification reaction. This constructs the copper-bismuth catalyst with a gradient structure of "dense surface + porous interior," ensuring high activity while further improving wear resistance.

Hydroformylation process by reaction between at least one alkene and a gaseous mixture comprising at least carbon monoxide and dihydrogen in the presence of porous catalytic capsules dispersed in at least one organic liquid phase L1. Said porous catalytic capsules, formed from a Pickering emulsion, consist of a liquid core comprising at least one liquid phase L2 comprising at least said hydroformylation catalyst and a porous crust formed by solid particles crosslinked by a crosslinking agent.

The present application relates to a kind of color low hardness high flame-retardant ethylene-propylene-diene rubber blend and its preparation method, belong to rubber material technical field.The blend includes by mass fraction:ethylene-propylene-diene rubber 50-85 parts, liquid chlorinated polyethylene 10-35 parts, white carbon black 15-25 parts, coupling agent 1-2 parts, phosphorus-nitrogen composite flame retardant 60-100 parts, peroxide vulcanizing agent 2-5 parts, auxiliary crosslinking agent 1-4 parts and titanium dioxide 2-6 parts.The liquid chlorinated polyethylene and ethylene-propylene-diene rubber form co-crosslinking network under peroxide vulcanizing agent;The composite flame retardant is compounded by ammonium polyphosphate and melamine cyanurate;The surface modification of white carbon black and coupling agent occurs in the mixing process.The preparation method includes one-stage mixing, two-stage mixing and vulcanization.The blend realizes high flame retardancy while maintaining low hardness and high elasticity, and can be applied to mining products, electronic appliances and rail transportation field.

This application provides a method for producing xylan preparations, comprising the following steps: S1, mixing xylanase, a composite carrier, and a buffer solution to obtain a first mixture; S2, mixing the first mixture, a polypeptide, and an organosilane to obtain a xylanase preparation; the method for preparing the composite carrier comprises the following steps: S01, mixing polyurethane, carbon fiber oxide, and a solvent, collecting the solid phase to obtain a first precursor; mixing chitosan solution and copper salt, then adding a pore-forming agent, an emulsifier, and a crosslinking agent for crosslinking to obtain a second precursor; mixing the second precursor, ferrous salt, ferric salt, and water to obtain a third precursor; mixing the third precursor and EDTA salt solution, eluting, and freeze-drying to obtain a fourth precursor; S02, mixing the first precursor, the fourth precursor, dopamine hydrochloride, and an ethanol solution, collecting the solid phase, drying, and obtaining the composite carrier. The xylan preparation obtained by this application has good stability.

The application discloses a kind of full biological base aerogel material and its preparation method and application, belong to the technical field of drug carrier material.The preparation method provided in the application is as follows: microcrystalline cellulose is dissolved in solvent, to obtain homogeneous cellulose solution;Amino reagent and sulfonating reagent are added to the homogeneous cellulose solution to carry out grafting reaction, to obtain double functional group modified cellulose solution;Biobased crosslinking agent is added to the double functional group modified cellulose solution to carry out crosslinking reaction, to obtain hydrogel;The hydrogel is replaced by solvent and dried, that is, obtained.The application uses full biological base component throughout, meets the biological safety standard of medical drug carrier, process step is simple, convenient to operate, the obtained aerogel has pH response characteristic, can inhibit the early release of drug in gastric juice and realize effective release in intestinal environment, improves the target delivery efficiency and availability of drug.

A method of introducing cavitation downhole includes creating cavitation nuclei, introducing cavitation nuclei to a drilling fluid, delivering the drilling fluid downhole, and activating an acoustic source downhole. A method of preventing lost circulation includes introducing cavitation nuclei downhole, introducing lost circulation materials downhole where the lost circulation materials include a resin and microcapsules of a crosslinking agent, activating an acoustic source which may induce cavitation; and rupturing the microcapsule of the crosslinking agent to prevent lost circulation.