781 results about "Catechol" patented technology

The invention discloses a high-viscosity activated rubber powder grafted functionalized block copolymer composite modifier and preparation thereof, composite modified asphalt and preparation and application thereof, and belongs to the technical field of modified asphalt. The composite modifier disclosed by the invention is formed by grafting catechol / polyamine modified aminated rubber powder and an epoxidized block copolymer. A catechol / polyamine group and an amino group are subjected to a condensation reaction to jointly modify the surface of the rubber powder, so that the surface of the rubber powder has rich functional groups and active sites, the rubber powder and an epoxidized block copolymer are subjected to a chemical crosslinking reaction in the later period, and the effect of enhancing the full performance of asphalt by the composite modifier is achieved; the problems that the composite modifier and the modified asphalt are prone to agglomeration, poor in compatibility and the like are solved. A self-healing mixture prepared from the composite modified asphalt and a self-healing material together has synergistic effects of the composite modified asphalt and the self-healing material, so that the pavement performance and the use quality are effectively improved, the service life of a road is prolonged, the energy loss is reduced, and the composite modified asphalt has application value in the field of roads.

The invention belongs to the technical field of biomedical materials, and particularly relates to adipose-derived mesenchymal stem cell loaded conductive hydrogel and a preparation method and application thereof, the preparation method comprises the following steps: step S1, after hyaluronic acid is subjected to oxidation treatment, dopamine is grafted to oxidized hyaluronic acid, and oxidized hyaluronic acid-dopamine is obtained; step S2, carrying out amination treatment on gelatin to obtain aminated gelatin; s3, mixing the oxidized hyaluronic acid-dopamine with the aminated gelatin, and carrying out Schiff base crosslinking, so as to obtain hydrogel; and step S4, loading the adipose tissue-derived stromal cells by using the hydrogel. Dopamine is grafted on an oxidized hyaluronic acid macromolecular chain through amidation reaction, the hydrophilicity and the electrical property of the macromolecular chain are improved, a catechol structure is provided to provide possibility for iron ion coordination, the tissue adhesion, the injectability, the mechanical property and the electrical conductivity of the hydrogel are improved, and the hydrogel can be applied to the field of biomedical materials. After being applied to a spinal cord injury rat model, the functional recovery can be promoted.

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 a double-layer dressing for promoting wound healing and inhibiting scars and a preparation method and application thereof.The double-layer dressing comprises a hydrogel layer and a piezoelectric film layer compounded on the hydrogel layer, and the piezoelectric film layer is prepared by mixing an organic piezoelectric material, a ferroelectric material and an organic solvent and then conducting an electrostatic spinning technology; the hydrogel layer is formed by curing a methacrylic anhydride acellular extracellular matrix, methacrylic anhydride catechol chitosan and conductive nanoparticles under the action of a curing agent. The lower skin contact layer of the double-layer dressing is the hydrogel layer, so that the directional growth of fibroblasts is favorably induced; the upper dressing is a piezoelectric material composite ferroelectric material, is beneficial to piezoelectric stimulation re-induction function recovery after final skin repair and guidance of directional growth of wound cells, and has good skin wound induction repair and scar inhibition effects.

The invention discloses a method for detecting antioxidants and polyphenols in food by constructing a colorimetric sensing array based on monatomic iron nano-enzyme, and belongs to the field of nanotechnology and colorimetric sensing. The traditional monatomic nano enzyme shows limited enzyme-like activity and substrate specificity, and is difficult to meet the comprehensive requirements of detecting various antioxidants and polyphenols in food. In the research, a novel nano-enzyme system (sdsFeN (at) G) of monatomic iron nano-enzyme is developed. The SdsFeN (at) G shows excellent enzymatic activity, and a three-channel colorimetric sensing array is constructed by utilizing inhibition of different antioxidants and polyphenols on oxidation of three chromogenic substrates, so that simple, convenient and reliable identification and detection of five substances (tert-butylhydroquinone, butylated hydroxyanisole, propyl gallate, catechol and hydroquinone) in food are realized.

The invention provides a low-temperature-impact-resistant food packaging material and a preparation method and application thereof.The low-temperature-impact-resistant food packaging material is prepared from, by mass, 100 parts of polylactic acid, 1-10 parts of modified layered double hydroxide and 5-40 parts of hyperbranched polyester; wherein the modified layered double hydroxide is obtained by treating layered double hydroxide with a composite anionic surfactant and then treating the treated layered double hydroxide with an organic cationic compound with a long alkyl chain; the composite anionic surfactant comprises a first anionic surfactant and a second anionic surfactant; wherein the first anionic surfactant comprises sodium dodecyl sulfate; the second anionic surfactant comprises a sulfonate anionic surfactant containing an amido bond and a catechol structure. Through the formula design, the impact toughness of the material at low temperature can be improved while the mechanical property of polylactic acid is maintained, and the material can be suitable for the field of food packaging.

The invention belongs to the field of compositions of biomedical materials and high-molecular compounds, and provides hydrogel capable of regulating and controlling the redox steady state of a microenvironment as well as a preparation method and application of the hydrogel. A macromolecular network of the hydrogel capable of regulating and controlling the redox steady state of the microenvironment is formed by catechol modified hyaluronic acid, carboxylated chitosan, oxidized dextran and iron ions through a hybridization cross-linking reaction; under physiological conditions, catechol groups in the hydrogel can be subjected to an autoxidation reaction to generate H2O2, and meanwhile, iron ions coordinated on the catechol groups in the hydrogel can catalytically decompose H2O2 into water and oxygen, so that the level of active oxygen in a microenvironment is adjusted. The hydrogel disclosed by the invention can realize bidirectional regulation and control on active oxygen in a pathological microenvironment after myocardial infarction, so that the redox steady state of the pathological microenvironment after myocardial infarction is maintained, and the regeneration and repair capacity of an existing hydrogel material with antioxidant capacity on myocardial tissues after myocardial infarction is improved.

The invention discloses an alkali-free accelerator and a preparation method and application thereof in the technical field of concrete additives, and the alkali-free accelerator provided by the invention comprises the following components in percentage by mass: 40%-50% of aluminum sulfate, 10%-15% of magnesium sulfate, 0.2%-0.6% of diethanol amine, 0.5%-1% of catechol-4-ammonium sulfonate, 5%-10% of a stabilizer and the balance of water. The stabilizer comprises silicate dispersion liquid and silica sol. The alkali-free accelerator provided by the invention can be used for spraying concrete, the mixing amount of the alkali-free accelerator is generally 4-6% of the mass of cement, the alkali-free accelerator is good in rapid setting effect and has excellent early and later compressive strength, and meanwhile, the alkali-free accelerator has relatively excellent stability.

The invention provides an interface-enhanced regenerated bone scaffold for sustained-release medicines as well as a preparation method and application of the interface-enhanced regenerated bone scaffold, and belongs to the technical field of bone tissue engineering. According to the invention, polycaprolactone and hydroxyapatite are taken as matrix components of the regenerated bone scaffold, so that the regenerated bone scaffold has mechanical strength matched with a host bone and good biocompatibility; the polydopamine coating is loaded on the surface and internal pores of the regenerated bone scaffold matrix, surface functional modification is easy to perform, and a catechol structure in the polydopamine coating can perform coordination binding with metal ions in MOFs, so that the falling rate of MOFs particles is reduced, and the MOFs particles are uniformly and stably distributed; the MOFs particles are used for loading the eucommia ulmoides extract, safety and non-toxicity are achieved, the eucommia ulmoides extract is encapsulated in the MOFs particles, the stability of the eucommia ulmoides extract can be improved, and a better drug release effect and a better bone regeneration promoting effect are achieved.

The invention relates to the technical field of electrochromic devices, in particular to an interface-enhanced gel-based electrochromic device and a preparation method thereof. The interface enhanced gel-based electrochromic device comprises a bottom electrode layer, a first modification layer, a gel electrolyte layer, a second modification layer, an electrochromic layer and a top electrode layer which are arranged in sequence, wherein the first modification layer and the second modification layer are independently modification layers based on catechol or derivatives thereof. According to the interface-enhanced gel-based electrochromic device, the excellent ion migration characteristic of the hydrogel electrolyte is utilized, and the strength and toughness of the electrolyte can be improved. The gel electrolyte layer based on the structure provided by the invention has excellent interface bonding force, and is convenient for ions to quickly migrate under the driving of an external field, so that the electrochromic device has excellent cycling stability.

The invention discloses a triggering probiotic-drug conjugate and a preparation method and application thereof, and belongs to the technical field of oral drug delivery systems, the triggering probiotic-drug conjugate comprises probiotics, an adhesive inner layer formed by coordination of tannic acid and Fe < 3 + >, and an outer layer formed by pterostilbene-phospholipid bridged by ROS-responsive thioether bonds and cholesterol; the inner layer coats the surfaces of the probiotics through coordination, and the outer layer coats the outer part of the inner layer through self-assembly. An outer lipid layer is decomposed under high-concentration ROS in an inflammation colon area, and probiotics coated with pterostilbene and a tannic acid layer are released. Pterostilbene relieves inflammation and rebuilds a pathological microenvironment, and catechol groups in a tannic acid layer and the surface of the intestinal tract generate multiple interactions to promote planting of probiotics. In UC mouse models, the conjugates exhibit enhanced therapeutic effects by inhibiting inflammation, restoring intestinal barrier function, and improving intestinal microbiota homeostasis. The invention has important transformation potential in clinical application of gastrointestinal diseases.

The invention relates to the technical field of adhesives, and provides a wet state maintaining type vegetable protein adhesive as well as a preparation method and application thereof. The hyperbranched catechol polymer adhesive filler disclosed by the invention is prepared by carrying out ring-opening reaction on epoxy groups of neopentyl glycol diglycidyl ether and pentaerythritol tetraglycidyl ether and amino groups of dopamine hydrochloride. Meanwhile, the vegetable protein adhesive is prepared from vegetable protein, a cross-linking agent and the adhesive filler according to a certain proportion. According to the adhesive filler and the corresponding vegetable protein adhesive, the defect that in the prior art, a bio-based adhesive, especially a vegetable protein adhesive, is poor in product performance due to poor moisture retention can be overcome.

The invention discloses a method for rapidly adsorbing heavy metal ions by a sulfydryl-functionalized non-woven fabric, relates to preparation of the sulfydryl-functionalized non-woven fabric and heavy metal adsorption application, and belongs to the technical field of functional materials and environmental protection. A catechol derivative, an oxidizing agent, a sulfur-containing coupling agent and the like are prepared into a reaction solution according to a certain proportion, then the non-woven fabric is immersed into the reaction solution for surface modification, the sulfydryl-functionalized non-woven fabric is prepared through reduction, and finally the sulfydryl-functionalized non-woven fabric is applied to adsorption and removal of heavy metal ions in water. The method has the advantages of being mild in condition, high in reaction speed and short in preparation period, the operation process is simple, universality is achieved, and the prepared functional material has the advantages of being good in heavy metal ion adsorption effect, good in functional modification layer stability and the like.

The invention discloses a high-performance modified resin material and a preparation method thereof, and belongs to the technical field of resin composite material preparation. The high-performance modified resin material is prepared from a main agent, a curing agent and nano filler, the main agent is prepared from 70 to 100 parts of bisphenol epoxy resin, 20 to 40 parts of dopamine modified epoxy resin, 5 to 15 parts of diglycidyl ether, 3 to 15 parts of flame retardant, 0.3 to 1 part of anti-settling agent, 0.05 to 0.3 part of defoaming agent and 0.1 to 0.5 part of pigment; the curing agent is prepared from the following components in parts by weight: 15-35 parts of a rapid curing agent, 10-30 parts of a toughening curing agent, 5-15 parts of a dopamine modified amine curing agent, 0.5-3 parts of an accelerant and 0.1-0.5 part of an antioxidant; and the nano filler is nano-particle coated PDA (potato dextrose agar). Amino of dopamine reacts with epoxy group, catechol is oxidized to generate a quinoneform structure, thiol-epoxy click reaction is catalyzed, and the material can be rapidly cured at low temperature; a flexible chain (-S-CH-CH-) of polymercaptan and a polyether chain of amine-terminated polyether are synergistically toughened, so that the toughness and impact resistance of the material can be improved.

The invention discloses a polyurethane coating and a preparation method thereof, and belongs to the technical field of antibacterial coatings. The preparation method of the polyurethane coating comprises the following steps: carrying out acyl chloride substitution reaction on a phenolic substance and a chlorine donor to obtain an intermediate reactant, and carrying out conjugate addition reaction on the intermediate reactant and an amine substance with hydroxyl groups at two ends to obtain antibacterial diol; reacting the antibacterial diol with isocyanate to obtain a polyurethane coating; the phenolic substance is selected from at least one of thymol, carvacrol, paeonol, catechol and theaflavin. The antibacterial coating is applied to the aspect of an antibacterial coating of a food contact part, the problem that the antibacterial property of an existing antibacterial coating is difficult to last is solved, and the antibacterial coating has the synergistic antibacterial effect of killing and defending bacteria.

The invention provides a Ni-molybdenum oxide / Nb2O5 nano composite catalyst as well as a preparation method and application thereof, and belongs to the technical field of catalysts. The catalyst precursor is prepared by adopting an excessive impregnation method, then the Ni-molybdenum oxide / Nb2O5 nano-composite catalyst is prepared by adopting a hydrogen reduction treatment method, active components in the catalyst are uniformly loaded, and the catalyst has excellent self-hydrogen hydrothermal catalytic performance. The Ni-molybdenum oxide / Nb2O5 nano composite catalyst prepared by the invention can minimize the dissociation energy of a C-O bond, promote the breakage of the C-O bond, enable the reaction to be carried out in a forward direction, and realize high-value conversion of guaiacol to catechol under mild reaction conditions without exogenous hydrogen.

The invention discloses a full-bio-based adhesive based on epoxidized soybean oil and a preparation method of the full-bio-based adhesive. Specifically, according to the method, epoxidized soybean oil is taken as a reaction substrate, citric acid is taken as a nucleophilic reagent to open an epoxy ring of the epoxidized soybean oil, tannic acid is taken as a catechol-like compound to provide adhesion performance after cross-linking polymerization, and a bio-based cross-linked network structure with excellent adhesion performance is constructed. The environment-friendly adhesive is researched and developed on the basis of full bio-based raw materials, and has the remarkable characteristics of no toxicity, reproducibility, environment friendliness and the like. The adhesive adopts an efficient one-pot synthesis process, the preparation process is simple and convenient, and industrial mass production is easy to realize. And the performance is excellent, the tensile strength and long-term stability are excellent, and due to the outstanding water resistance and mildew-proof performance, the coating stands out of similar products. In addition, the product is wide in raw material source and obvious in cost advantage, and has high performance and economic benefits.

The invention discloses a waterproof pressure-sensitive adhesive tape and a production process thereof, and relates to the technical field of pressure-sensitive adhesives. The production process of the waterproof pressure-sensitive adhesive tape at least comprises the following steps: uniformly stirring 2-ethylhexyl acrylate, n-butyl acrylate, methyl methacrylate, acrylic acid, hydroxyethyl acrylate, a polymerizable catechol monomer and a solvent, and adding an initiator to react to obtain an acrylate copolymer solution; uniformly mixing fluorine-containing side chain diisocyanate and a catalyst, and dropwise adding the mixture into the acrylate copolymer solution for reaction to obtain a pressure-sensitive adhesive; mixing the pressure-sensitive adhesive solution with a curing agent, defoaming, coating on a base film, drying and curing to obtain the waterproof pressure-sensitive adhesive tape. The waterproof pressure-sensitive adhesive tape prepared by the invention has the characteristics of strong viscosity and good waterproofness.

The invention discloses a polyphenol modified carbon fiber reinforced sulfonated polyetheretherketone composite material and a preparation method thereof, and belongs to the field of polymer composites.The preparation method comprises the steps that a resin matrix and filler are filled into a mold to be sintered, the resin matrix is sulfonated polyetheretherketone, the filler comprises modified carbon fibers and nano-silicon dioxide, and the modified carbon fibers and the nano-silicon dioxide are sintered to obtain the polyphenol modified carbon fiber reinforced sulfonated polyetheretherketone composite material; the modified carbon fiber is prepared by taking carbon fiber, catechol and polyethyleneimine as raw materials in a Tris buffer solution. The hydration lubrication performance of a resin matrix is improved through sulfonated polyetheretherketone, the hydrophilic property is enhanced, a polyphenol coating is formed through self-polymerization reaction on the surfaces of the carbon fibers, the adhesion performance of the surfaces of the fibers is improved through the pi-pi stacking effect, and the interface bonding force between the carbon fibers and the modified resin matrix is enhanced; the nano silicon dioxide is introduced to modify the matrix of the composite material, so that not only is the overall wettability of the material optimized, but also the mechanical property and the wear resistance are effectively improved, and the final composite material has the characteristics of high strength and low friction.

The invention relates to the technical field of solid-state batteries, and provides a positive plate, a preparation method thereof and a solid-state battery. The positive plate comprises a positive current collector and a positive active material layer arranged on at least one side surface of the positive current collector; the positive electrode active material layer comprises a nickel-containing positive electrode active material, a solid electrolyte, a conductive agent and a binder; the binder comprises a first binder and a second binder; the first binder comprises polymer nanofibers, and the length-diameter ratio of the polymer nanofibers is 30-90; the mass ratio of the first binder in the positive active material layer is 0.8%-5%; the second binder includes a catechol group-containing polymer. According to the invention, the first binder and the second binder are combined for use to form a tough composite adhesion system, so that the adhesion of the positive plate is remarkably improved, and the high and low temperature performance and flexibility of the solid-state battery are improved.

The invention discloses conductive structural color hydrogel for MI monitoring and treatment as well as a preparation method and application of the conductive structural color hydrogel. Comprising a conductive nano-material, and the conductive nano-material has a catechol group; an HPC cholesteric liquid crystal; a matrix material; a cross-linking agent; the conductive structural color hydrogel is formed through physical and / or chemical interaction among the conductive nano material, the HPC cholesteric liquid crystal, the matrix material and the cross-linking agent. The conductive structural color hydrogel has enhanced electromechanical response and force-induced discoloration response characteristics, has a photoelectric double-signal sensing function, can accurately and visually monitor mechanical stimulation in real time, can be used as a flexible sensing material, is used for preparing products capable of realizing visual feedback and digital feedback of mechanical stimulation, and has wide application prospects. And the hydrogel can be used for preparing a product for compensating and / or repairing electrical conduction of biological tissues, especially can be used for preparing a conductive structural color hydrogel patch for monitoring and / or treating myocardial infarction (MI), and has a wide application prospect.

The application discloses a mussel-inspired multifunctional double-network crosslinked hydrogel wound dressing. A hydrogel network formed by dynamic covalent crosslinking between carboxymethyl chitosan and oxidized sodium alginate is utilized; further, a natural antioxidant, gallic acid, with a catechol structure is introduced to enhance the tightness of the hydrogel network combination and endow the hydrogel with certain adhesion and antioxidant properties; finally, a mussel adhesive fluid containing catechol and iron is imitated to have strong tissue adhesion behavior under alkaline conditions, which is suitable for dynamic wound treatment, so as to prepare a mussel-inspired multifunctional double-network crosslinked hydrogel wound dressing. In addition, catechol-Fe 3+ Metal coordination also shows strong antibacterial effect, and under the irradiation of near-infrared light, light energy can be converted into heat energy for preventing and treating wound infection, shortening wound closure time and preventing scar formation.

The invention relates to an oxidase response type molecular probe as well as a preparation method and application thereof, and belongs to the technical field of medical imaging. Aiming at the problem that the inflammation activity is difficult to accurately evaluate in the prior art, the invention provides a molecular imaging probe capable of responding to the activity of in-vivo myeloperoxidase (MPO), and the molecular imaging probe can be used for real-time and non-invasive imaging monitoring of the activity of the in-vivo MPO, so that the activity of the inflammatory reaction of a focus is accurately evaluated. The invention provides a chelating agent with structural characteristics of a chelating unit and an enzyme response unit, and is characterized in that the enzyme response molecular probe is constructed by taking rigid framework cyclohexanediamine (CDTA) as a transition metal chelating unit and taking electron-rich functional groups (such as phenol, catechol or 5-hydroxytryptamine) as the enzyme response unit. The probe is chelated with paramagnetic metal (such as Mn < 2 + >) for magnetic resonance imaging (MRI) or radioactive metal (such as 68Ga) for positron emission tomography (PET), so that specific response to MPO activity is realized. The dynamic stability of the probe is remarkably improved; after the MPO is responded, the relaxation efficiency is improved by 2-3 times, and the sensitivity is optimized; the cytotoxicity is low; in an acute pancreatitis model, the MRI contrast noise ratio (delta CNR) reaches 77.39 + / -7.04 and is 4.2 times that of a control group, the PET uptake rate is remarkably improved, bimodal imaging is supported, and accurate positioning and quantitative evaluation of the inflammation activity are achieved.

The invention discloses a preparation method and application of a water-based mixed binder, and relates to the technical field of water-based binders. The water-based mixed binder is obtained by mixing and compounding a water-based polyurethane emulsion and polyvinylidene fluoride. Wherein in the preparation process of the waterborne polyurethane emulsion, amino-terminated polyacrylic acid-catechol is added to serve as a chain extender for use, the amino-terminated polyacrylic acid-catechol is prepared by initiating polymerization of 4-allyl catechol, alkenyl siloxane and an acrylic monomer, and after polyacrylic acid-catechol is prepared, the amino-terminated polyacrylic acid-catechol is added to serve as a chain extender for use; and carrying out an ultraviolet irradiation click reaction on the obtained product and mercaptoacetic acid ethanolamine ester. The waterborne polyurethane emulsion prepared by the invention can greatly improve the electrochemical performance of the lithium battery, and especially has a great improvement effect on the peel strength, the cycle discharge specific capacity and the coulombic efficiency of the lithium battery.

The application relates to a dry powder drag reducer for fracturing fluid and a preparation method thereof, and belongs to the technical field of drag reducers; the dry powder drag reducer is copolymerized and modified by preparing a polymerizable modifier, aromatic rings and sulfonic acid ion structures are introduced into the dry powder drag reducer, the high-temperature resistance and salt resistance of the dry powder drag reducer are effectively improved, in addition, the modified dry powder drag reducer structure also has a catechol structure, can form a stable five-membered ring borate with a boron crosslinking agent, and the dry powder drag reducer can be mixed with a guar gum drag reducer when the boron drag reducer is used, so that the problem of poor sand carrying capacity of the dry powder drag reducer is effectively solved.

The invention discloses a catechol side group-containing polylysine derivative as well as a preparation method and application thereof. The preparation method comprises the following steps: (1) dissolving catechol acid in an organic phase, firstly adding NHS, stirring and dissolving until the materials are uniformly mixed, then adding EDC.HCl, and stirring and reacting to obtain a catechol-NHS intermediate solution; (2) dissolving polylysine or a salt thereof in a water phase, and adjusting the pH value to 6.0-7.0 by using an alkaline solution to obtain a solution of polylysine or a salt thereof; and (3) adding the intermediate solution obtained in the step (1) into the polylysine or the salt solution thereof obtained in the step (2), and maintaining the pH value of the reaction system at 5.0-6.0 by using an alkaline solution to obtain the catechol side group-containing polylysine derivative. The preparation method is short in reaction time and mild in reaction condition, and the obtained product is high in grafting rate and high in raw material conversion rate and has a good application prospect in the aspects of tissue adhesives and the like.

The invention relates to a dry powder drag reducer for fracturing fluid and a preparation method thereof, and belongs to the technical field of drag reducers. The dry powder drag reducer is subjected to copolymerization modification by preparing the polymerizable modifier, an aromatic ring and sulfonic acid ion structure is introduced into the dry powder drag reducer, the high temperature resistance and salt resistance of the dry powder drag reducer are effectively improved, in addition, the modified dry powder drag reducer structure further has a catechol structure, and the modified dry powder drag reducer has a good application prospect. The dry powder drag reducer can form stable five-membered ring boric acid ester with a boron cross-linking agent, when the boron drag reducer is used, the dry powder drag reducer can be mixed with a guar gum drag reducer for use, and the problem that the dry powder drag reducer is poor in sand carrying capacity is effectively solved.

The invention discloses a bio-based polymer emulsion as well as a preparation method and application thereof, and belongs to the technical field of aqueous polymer emulsions. The emulsion comprises an aqueous continuous phase, bio-based polymer particles, a stabilizing system, and a bionic catechol adhesion component. Specific modified starch is innovatively utilized for assistance, and a bionic adhesion shell layer is constructed on the surface of a bio-based polymer core in situ. Compared with similar products in the market that adhesion to inert substrates can be improved only by adding a large amount of tackifying components, the scheme has the advantages that excellent dry and wet adhesion can be realized on the surfaces of difficult-to-adhere substrates such as polypropylene and polyethylene only by constructing an extremely thin interface functional layer, and the functionalization efficiency and economical efficiency of the bio-based material are greatly improved. Meanwhile, the system effectively overcomes the industrial problem that the high-solid-content emulsion is easy to settle, has excellent storage stability and construction adaptability, and conforms to the development trend of sustainable barrier packaging and high-performance water-based coatings in the future.

The invention provides a multi-walled carbon nanotube paste electrode based on gold nanoparticles and C60 modification as well as a preparation method and application thereof, and belongs to the technical field of electrochemical sensors. The preparation method comprises the following steps: firstly, modifying fullerene C60 on the surface of a carbon nanotube paste electrode (MWCNTPE) to form C60 / MWCNTPE, then loading gold nanoparticles on the surface of the C60 / MWCNTPE, and finally constructing the AuNPs / C60 / MWCNTPE composite electrode. The prepared composite electrode is used for environmental estrogen detection, especially for simultaneous detection of hydroquinone, catechol and bisphenol A. The method has the advantages of high sensitivity and low detection limit, can solve the problem that hydroquinone and catechol isomeride are difficult to separate through the detection capability, has the advantages of simplicity and convenience in operation and low cost, and has good practical applicability, stability and reproducibility.

The invention relates to the technical field of fabrics, in particular to a cool-feeling long cilia strip and a preparation method thereof.The cool-feeling long cilia strip is composed of cool-feeling fibers and a long cilia strip base material and is characterized in that the cool-feeling fibers comprise a core layer, a functional skin layer and an outer thin skin layer; the functional skin layer is prepared from the following components: a sulfonated copolyester matrix, catechol grafted master batch, surface modified zeolite nano powder, an anti-hydrolysis agent and an antioxidant, and the functional skin layer also contains introduced Zn < 2 + > and Mg < 2 + >. Zn < 2 + > and Mg < 2 + > which are stably combined on anchoring points of sulfonated copolyester are subjected to hydration endothermic reaction when being in contact with water, so that a cool feeling is generated; the surface modified zeolite nano powder synergistically enhances moisture absorption and water temporary storage by virtue of the specific surface area, and continuously provides water for an ionized hydration reaction to prolong and amplify a cool feeling effect; the catechol grafting structure endows the fiber with antibacterial performance, and long-term stability of the structure is ensured through an interface enhancement effect. And the outer layer hydrophilic polyester is matched, so that the product has comfort, durability and functionality.