86results about How to "High swelling rate" patented technology

The invention relates to a porous temperature-sensitive hydrogel slow release formulation and a preparation method thereof. The preparation method comprises the steps of taking poly(N-isopropylacrylamide) porous temperature-sensitive hydrogel as a carrier, loading drugs in the hydrogel, thereby realizing controlled release of the drug by utilizing the temperature sensitivity characteristic of the poly(N-isopropylacrylamide). When the temperature is lower than the LCST (Lower Critical Solution Temperature) of the hydrogel, the drug release is slow, and when the temperature is higher than the LCST, the release speed is accelerated. The preparation method can be used for preparing temperature-sensitive sustained-release pesticide and insecticide, the drug use frequency can be reduced by utilizing the temperature-sensitive sustained-release property, and the effects of improving the pesticide effect and reducing the toxicity can be achieved. The porous temperature-sensitive hydrogel sustained-release inhibitor is fast to react, and simple in technique, has good temperature-sensitive characteristic and sustained-release property, is convenient to use, safe and efficient, thereby having wide application prospects.

The invention belongs to the field of materials of lithium ion batteries, and particularly relates to a negative electrode of the lithium ion battery and a preparation method thereof. The negative electrode of the lithium ion battery comprises a current collector and negative electrode paste for coating the current collector, wherein the negative electrode paste comprises the following dry ingredients by weight percent: 92-99% of active material and 1-8% of an adhesive; the active material is graphite or graphite alloy; the adhesive is waterborne multi-component copolymerization emulsion. The waterborne multi-component copolymerization emulsion is used for replacing conventional butadiene styrene rubber and serves as the adhesive for the lithium ion battery, so that the more excellent adhesive performance is realized in comparison with the adhesive performance of a conventional adhesive, and meanwhile, the prepared battery has prominently excellent performances such as good low temperature characteristics, low circulation expansion rate, good long cycling performance and relatively excellent processing characteristics; the negative electrode prepared by using the method has relatively small impedance and relatively good dynamic performance and is capable of effectively solving the problem of risk of separation of lithium in the lithium ion battery at low temperature; the prepared battery has the characteristics of safety, reliability and long cycle life.

The invention discloses a joint lubricating material and a preparation method thereof. The material is covalent crosslinked O-carboxymethyl chitosan hydrogel, wherein the gelation time is 0.5-10min, the water content is higher than 70%, and the water retention rate is higher than 65%; and the material is prepared by carrying out gelation reaction between O-carboxymethyl chitosan of which the degree of deacetylation is greater than 25% and glutaric dialdehyde. The prepared covalent crosslinked O-carboxymethyl chitosan hydrogel has good biocompatibility, can serve as a joint lubricating agent, is suitable for local injection of joints, and can enable the joints to keep certain capacity and elastic properties within certain time so as to promote cartilage tissue repair.

The invention discloses a ceramsite concrete slab. The ceramsite concrete slab per cubic meter mainly comprises the following raw materials: 380-410kg of cement, 790-900kg,coal ash or furnace clinker, 173-180kg of ceramsite, 115-120kg of water and a wire mesh. The ceramsite concrete slab provided by the invention has high strength, freezing resistance and anti-swelling efficiency and can be used as an outer wall of a building; the ceramsite concrete slab can be made into a small size so as to meet the break joint requirement during installation, is suitable for strength during installation and rigidity requirement of the wall space and has wide applicable range; the ceramsite concrete slab achieves the anti-seismic effect in the structure, has low density, is light in mass, and has convenience in transportation and field cutting installation; and the ceramsite concrete slab has good heat preservation effect and sound insulation effect and can realize the self heat preservation function.

The invention provides a process for preparing aqueous gel comprising the following steps, mixing and dissolving alkene group monomer, cross linking agent and initiating agent by the ratio of 100:2-50:0.2-1:1-10, using microwave having a frequency of 2450MHz or frequency changed microwave of 300MHz-300GHz for radiation to the reaction system.

The invention relates to a maca dietary fiber as well as a preparation method and application thereof. The maca dietary fiber is prepared by processing maca root or maca residue as a raw material according to an enzymatic method or an acid-alkali method. The prepared maca dietary fiber is high in dietary fiber content, swelling rate, water holdup rate, oil holdup rate, glucose adsorption rate and glucose block rate, and can be used as a food additive, a functional health food or the like; meanwhile, the preparation method is simple and convenient in technique, and suitable for industrial production; waste recycling is realized, and the application value is important.

This invention relates to nanometer hydrogel stuff and its preparation method. This nanometer hydrogel stuff adopt method of intercalation and reversible addition - rupture chain transfer free radical polymerization, add monomer, initiator, cross-linking agent, chain transfer agent and montmorillonite all to organic solvent system, at presence of initiator, obtain nanometer structure hydrogel stuff. This hydrogel can reach swelling balance in 2 hours; can reach de- swelling balance in 20 minutes. The swelling rate of this invention is 400 to 700 percent.

The invention discloses a method for preparing a nano-fiber dressing by virtue of an electrospinning method. The preparing method comprises the following steps: preparing a 0.1g / mL type I collagen solution by taking hexafluoroisopropanol as a solvent, and adding lidocaine, so that outer spinning liquid is obtained; preparing a 0.2g / mL polycaprolactone solution by taking dichloromethane as a solvent, and adding mupirocin, so that inner spinning liquid is obtained; and adding the outer spinning liquid and the inner spinning liquid into two injectors, connecting the two injectors by virtue of a coaxial needle, so that a coaxial structure is formed for conducting high-pressure electrostatic spinning, drying an obtained dressing in a vacuum environment and soaking the dried dressing in an ethanol solution of genipin, washing the dressing with ethanol and drying the dressing, so that the nano-fiber dressing is obtained. The prepared nano-fiber dressing is higher in swelling rate and mechanical strength; the nano-fiber dressing is more suitable to be used as a wet dressing and for absorbing exudation; and the nano-fiber dressing is excellent in long-term use resistance, antibacterial performance and the like.

The invention relates to postoperative anti-adhesion medical dressing and a preparation method thereof, belonging to the field of biological materials. The postoperative anti-adhesion medical dressing comprises medical non-woven fabric, wherein a layer of chitosan is arranged on the surface of the medical non-woven fabric; the chitosan is fixed on the medical non-woven fabric through a cross-linking agent; a layer of hyaluronic acid hydrogel is arranged on the chitosan; the chitosan and the hyaluronic acid hydrogel are fixed through an ionic bond between the chitosan and the hyaluronic acid hydrogel. The postoperative anti-adhesion medical dressing disclosed by the invention has a good postoperative anti-adhesion effect, so that the intensity of the dressing is increased; the chitosan is used as an adhesion layer with bacteriostatic activity, so that the wound infection is effectively prevented. The invention further provides a preparation method for the postoperative anti-adhesion medical dressing. The adopted raw materials are biodegradable natural high polymer materials, the biocompatibility is good, the method is simple, the used solvent is water, and organic solvent residue is avoided.

The invention discloses a preparation method of magnetic composite hydrogel for copper ion adsorption. The preparation method comprises: deacetylating cellulose acetate nanofibers to obtain cellulosenanofibers, dissolving acrylic acid, maleic anhydride and N, N'-methylene bisacrylamide in a nitric acid solution to obtain a reaction solution A, dissolving ammonium cerium nitrate in the nitric acidsolution, adding the cellulose nanofibers and vinyl-modified silica into the solution to obtain a reaction solution B, adding the reaction solution A into the reaction solution B drop by drop for a reaction so that cellulose nanofiber-grafted poly(acrylic acid-co-maleic anhydride)hydrogel is obtained, dissolving ferrous chloride and ferric chloride in deionized water, adding the cellulose nanofiber-grafted poly(acrylic acid-co-maleic anhydride)hydrogel and ammonia water into the solution and carrying out a reaction process. The preparation method is simple and fast, has strong operability andis very suitable for industrial production.

The invention discloses a preparation method and application of high-adhesion composite functional hydrogel, and the method comprises the following steps: modifying hyaluronic acid grafted dopamine, uniformly mixing with quaternary ammonium salt chitosan according to a volume ratio of 1: 1, and carrying out catalytic crosslinking by using hydrogen peroxide and horse radish peroxidase to form gel. The hydrogel can be used for constructing a multifunctional hydrogel dressing at an acute skin injury focus, and can also be applied to a biological adhesive. The hydrogel not only has adhesion performance, but also has appropriate gelling time, ultrahigh water content and swelling rate, good antioxidant, antibacterial, hemostatic and self-healing capabilities, and can remarkably promote wound healing.

The invention discloses a carboxymethylcellulose (CMC) nanofiber membrane loaded with silver nanoparticles and a preparation method thereof and aims at providing a silver-loaded antibacterial nanofiber and a preparation method which have the characteristics that the preparation method is simple and pollution-free, the prepared fiber membrane has excellent antibacterial property and biocompatibility and only CMC serves as a base material. The preparation method comprises the following steps: performing electrostatic spinning by taking a mixed solution of polyethylene oxide (PEO) and CMC as a spinning solution; soaking a fiber membrane in a silver nitrate solution of a certain concentration, taking out the membrane, drying in the dark, and reducing in moist air at normal temperature; and finally, preparing the CMC nanofiber membrane loaded with the silver nanoparticles. The prepared fiber membrane has excellent antibacterial property and biocompatibility, is good in structure and mechanical property retention and is a preferred material in the field of wound coating, and the preparation method is simple, economic and environment-friendly.

The invention discloses photodynamic antiseptic dressing with an antibacterial function, a preparation method and an application. The antiseptic dressing is prepared by mixing a photocuring oligomer, an antimicrobial agent, a photosensitizer, a photocuring monomer and water via irradiation film formation. After the light irradiation film formation, the dressing can form artificial crusta that has an antibacterial property and can protect a wound; and the dressing can block bacterial invasion, reduces a risk of blood poisoning caused by wound infection and accelerates wound incrustation. The dressing is applicable to the various wound such as chronic ulceration, scalding and burning.

The invention relates to a preparation technique of a wound dressing, which is characterized by comprising steps as follows: acrylic sulfonate monomers and acrylic amide monomers are used as crosslinking polymerization materials, glycerol is used as a plasticizer, and unsaturated double-bond bifunctional ester monomers are used as a crosslinking agent; ultraviolet polymerization crosslinking is carried out to obtain an aquagel material; and the aquagel is combined with a substrate to obtain the wound dressing. The preparation technique of the wound dressing is reasonable, and has good operational controllability. The invention can implement high tensile resistance of the wound dressing and no adhesion characteristic of the wound; the wound dressing has good water absorptivity, has good characteristics of preventing external contamination and bacteria entry; and the aquagel used by the wound dressing can also be used as a pharmaceutical vector to perform the functions of embedding and carrying drugs.

The invention discloses hydrogel with controllable mechanical properties and swelling ratio as well as a preparation method and application thereof. Acrylamide monomers are adopted as a matrix to be mixed and heated to react with ascidean cellulose nano crystal aqueous dispersion, zinc methacrylate and an initiator to prepare the hydrogel with the controllable mechanical properties and swelling ratio. The mechanical properties and swelling ratio of the hydrogel can be simultaneously improved, and the application potential is great.

An aqueous polyurethane resin dispersion is a dispersion of a polyurethane resin in an aqueous medium, the polyurethane resin being obtained by reacting (A) a polyurethane prepolymer obtained by reacting (a) a polyisocyanate compound, (b) a polyol compound including a polycarbonate polyol with a number average molecular weight of 400 to 3000, (c) an acidic group-containing polyol compound and (d) a blocking agent, with (B) a chain extender, the total content of urethane bonds and urea bonds being 7 to 15 wt %, the content of carbonate bonds being 15 to 40 wt %, the content of ether bonds being 0.5 to 5 wt %, the content of isocyanate groups bonded to the blocking agent being 0.2 to 2.0 wt %, each of these contents being based on solid contents, the acid value being 10 to 16 mg KOH / g. The aqueous polyurethane resin dispersion can form coating films which permit new application while exhibiting excellent water resistance and solvent resistance. A coating composition includes the dispersion. A polyurethane resin film is obtained by thermally drying a composition including the dispersion.

Disclosed is a method for producing a conductive film, which includes a silver metal forming step for forming a silver metal portion by exposing and developing a photosensitive material which has a silver salt-containing layer containing a silver salt on a supporting body, and a smoothing step for smoothing the silver metal portion. The smoothing step is performed by calender roll at a line pressure of not less than 1960 N / cm (200 kgf / cm). Consequently, the surface resistance of the film after development can be reduced in production of a conductive film which is effective for shielding electromagnetic waves.

The invention discloses a preparation method of a gelatin-based hydrogel in a microwave-ultrasonic coupling field. The preparation method is characterized in that polyvinyl alcohol and carboxymethyl cellulose with excellent biological compatibility are used as stents, a chitosan derivative is used as a crosslinking agent, and the gelatin is crosslinked and modified to prepare the gelatin-based hydrogel. The preparation method comprises the following steps of (1) mixing the chitosan derivative and the gelatin according to the mass ratio of 1:10 to 1:4, adding the polyvinyl alcohol or carboxymethyl cellulosewith of which the mass is equal to 50-150% of the mass of gelatin, and adding a proper amount of high purity water, so as to ensure the 20-50% of solid content in the solution; (2) adjusting the pH (potential of hydrogen) value in the solution to 3.5-5.0, heating in a 50-95 DEG C water bath to form a transparent solution, and putting into a microwave-ultrasonic coupling reaction field; (3) reacting for 1-3h in the microwave-ultrasonic coupling reaction field under the conditions of microwave frequency of 300-1000MHz, ultrasonic frequency of 500-1500MHz, and temperature of 70-95 DEG C; (4) freezing and drying, so as to obtain a hydrogel sample. The preparation method has the advantage that because the number of reaction function groups in the gelatin and chitosan molecules is more, the obtained hydrogel has better absorption property on heavy metals and dyes.

An aqueous polyurethane resin dispersion exhibits excellent drying properties of coating films and gives coating films having high water resistance and on the other hand showing a high rate of swelling with respect to aqueous cleaning liquids to permit new application. The aqueous polyurethane resin dispersion is a dispersion of a polyurethane resin in an aqueous medium, the polyurethane resin being obtained by reacting (A) a polyurethane prepolymer obtained from (a) a polyisocyanate compound, (b) a polycarbonate polyol with a number average molecular weight of 400 to 3000, (c) an acidic group-containing polyol compound and (d) a blocking agent, with (B) a chain extender, the total content of urethane bonds and urea bonds being 7 to 15 wt %, the content of carbonate bonds being 15 to 40 wt %, the content of ether bonds being 0 wt %, the content of isocyanate groups bonded to the blocking agent being 0.2 to 2 wt %, each of these contents being based on solid contents, the acid value being 11 to 16 mg KOH / g, the weight average molecular weight being 25,000 to 60,000. A coating composition includes the dispersion. A polyurethane resin film is obtained by thermally drying a composition including the dispersion.

The invention discloses high-strength responsive hydrogel based on a block copolymer and a preparation method thereof, and belongs to the technical field of preparation of materials. A reactive amphiphilic triblock copolymer capable of self-assembling in water to form micelles is subjected as an intra-system macromolecular crosslinking point instead of the traditional crosslinker N,N-methylene diacrylamide to free radical polymerization with a monomer so as to obtain high-strength hydrogel having uniform crosslinking density. The reactive amphiphilic triblock copolymer is not electrically charged; the size and stability of the reactive amphiphilic triblock copolymer are scarcely influenced by ion strength or charge in a solution; therefore, the reactive amphiphilic triblock copolymer is applicable to most free radical polymerized monomers, and synthesis of intelligent functional hydrogel is facilitated. The preparation method herein is simple to perform; preparing is easy; the raw materials are good in safety and stability and are easy to store; the preparation process is green and safe, has short time and low byproduct production; a means is provided to prepare multifunctional high-strength hydrogel. The prepared hydrogel has excellent pH response and mechanical properties.

The invention provides bionic composite hydrogel as well as a preparation method and application thereof, and belongs to the technical field of high polymer materials. The composite hydrogel is sequentially subjected to confinement drying and swelling, and then is soaked in a saturated NaCl solution, so that the aggregation degree, orientation change and supramolecular interaction strength of molecules in the composite hydrogel can be regulated and controlled, and the mechanical property of the composite hydrogel material is optimal; and the water content and the swelling rate of the bionic composite hydrogel better meet the biochemical performance requirements of a bionic material. The bionic composite hydrogel prepared by the preparation method provided by the invention has high mechanical properties similar to those of natural load-bearing biological tissues; the bionic composite hydrogel is endowed with high toughness due to a special energy dissipation mechanism of a dual-network structure in the bionic composite hydrogel; and the water-containing property and the swelling property are comparable with those of a natural tissue.

The invention relates to a preparation method of a dendriform organic montmorillonite reinforced aquagel, which comprises the following steps: by using organic montmorillonite as a physical crosslinking agent, introducing dendriform polymer into the poly(N-isopropylacrylamide) aquagel, and compounding the two polymers by using an atom transfer radical polymerization (ATRP) technique to obtain the dendriform organic montmorillonite reinforced aquagel. Compared with the prior art, in the prepared dendriform organic montmorillonite crosslinked gel structure, the phyllosilicate does not exist in the gel in the form of simple physical compounding, but exists in the form of a compound crosslinking agent to crosslinking the organic polymers into the network structure, thereby greatly enhancing the strength, elongation at break and swelling rate of the gel.

The invention provides a water-based PVDF coated lithium ion battery diaphragm. The diaphragm comprises a base membrane and a PVDF coating which coats one side or two sides of the base membrane, the coating is prepared from a mixed emulsion, the mixed emulsion comprises a PVDF emulsion and a binder emulsion, the weight ratio of the PVDF emulsion in the mixed emulsion is 70-98%, and the weight ratio of the binder emulsion in the mixed emulsion is 2-30%. The invention also provides a preparation method of the water-based PVDF coated lithium ion battery diaphragm. The water-based PVDF coated lithium ion battery diaphragm provided by the invention is excellent in comprehensive performance, and the preparation method is simple in production process and pollution-free.

The invention provides a novel fire extinguishing material and a preparation method thereof. According to the novel fire extinguishing material and the preparation method thereof, acrylic acid and acrylamide are used as water-absorbing monomers to be subjected to cross-linking reaction under the action of a cross-linking agent and an initiator so as to generate gel, chitosan is added in the gel preparation process, so that the rigidity of the gel is improved, the water absorption rate of the gel is increased, and the gel is not liable to be dried and cracked at a high temperature; and a surface active agent is further compounded to form a stable and efficient foaming agent, abundant and compact foams are formed through high-speed stirring at the later stage of the cross-linking reaction soas to achieve the fire extinguishing effect, in addition, the formation of gel pores is facilitated by the aid of a stabilizer and a pore-forming agent of sodium carbonate at the later stage of the gel forming process, so that the swelling rate can be greatly increased, meanwhile, ammonium polyphosphate is modified, so that the hydrophobicity and the grafting performance can be improved, and grafting is carried out on the gel by utilizing the cross-linking reaction, so that the fire extinguishing performance can be further improved. The fire extinguishing material has the advantages of beinghigh in fire extinguishing performance, high in speed, good in effect, capable of improving the fire extinguishing efficiency, capable of preventing recrudescence of a fire, low in application cost and suitable for large-scale popularization.

The invention discloses injectable hemostatic cryogel for promoting tissue regeneration and a preparation method and application thereof. The preparation method comprises the following steps: ultrasonically dispersing polydopamine, chitosan and collagen in deionized water, adding glacial acetic acid, and stirring until dissolving; and dissolving oxidized dextran in deionized water, adding an oxidized dextran solution into a mixed solution under vigorous stirring, transferring to a refrigerator for a reaction, and melting at room temperature to obtain the injectable hemostatic cryogel for promoting tissue regeneration. The aperture of the cryogel is 50-200 [mu] m, and the cryogel is provided with interconnected macroporous structures and stable mechanical strength, can be conveyed to a narrow and deep wound through an injector after being compressed and fixed, quickly recovers to block the wound and form a physical barrier after sucking blood, and activates a blood coagulation process through concentrated blood to achieve a hemostasis effect. The cryogel prepared by the invention has rapid shape recovery capability, injectability, good hemostatic capability and the like.

The invention relates to a temperature-sensitive hydrogel with hyperbranched structure and a preparation method and application thereof. The temperature-sensitive hydrogel is macromolecular hydrogel of three-dimensional mesh structure using hyperbranched polyethyleneimine as a center and having uniform molecular weight distribution. A hyperbranched RAFT (reversible addition-fragmentation chain transfer polymerization) reagent is prepared first, polymerization of temperature-sensitive monomer and vinyl pyrrolidone is initiated by means of RAFT aqueous solution polymerization, a room-temperatureself-crosslinked monomer is added for polymerization, and the temperature-sensitive hydrogel is prepared. The temperature-sensitive hydrogel and the preparation method and application thereof have the advantages that the synthesis of temperature-sensitive hydrogel with hyperbranched structure by using the hyperbranched polyethyleneimine as a center is reported for the first time; the self-crosslinked monomer added in the final stage of the hydrogel RAFT polymerization process has higher hyperbranched branch molecular weight, and the hydrogel has higher swelling rate; the hydrogel is preparedby means of the RAFT aqueous solution polymerization, the molecular weight stability and temperature-sensitive responsiveness of the hydrogel are guaranteed, and a biological environment can be simulated.

The present invention relates to the technical field of slick water, and is slick water suitable for field continuous mixing, and a preparation method therefor. The slick water suitable for field continuous mixing has the following raw materials in parts by weight: 0.6-1 parts of a resistance reducing agent, 6-10 parts of a multifunctional synergist, and 990-994 parts of water. The slick water suitable for field continuous mixing provided by the present invention are dramatically increased in the swelling ratio and the resistance reducing ratio when compared with the existing slick water. The slick water suitable for field continuous mixing provided by the present invention is good in resistance reducing effect, thorough in gel breaking, and superior to a common fracturing fluid in all indicators of the flowback liquid after gel breaking, meets the production requirements of field continuous mixing, reduces the construction pressure and ensures safe construction.

The invention provides a high-strength water-retaining perfluorosulfonic acid proton exchange membrane as well as a preparation method and application thereof. The preparation method comprises the following steps: (1) preparing functionalized graphene: weighing graphene oxide, a lactic acid monomer, deionized water and stannous octoate according to a mass ratio, adding into a high-pressure kettle,pressurizing and heating; (2) preparing a perfluorosulfonic acid resin modified material: heating a mixed water solution of perfluorosulfonic acid resin with -SO3Na at the tail end and polyvinyl alcohol, adding the lactic acid functionalized graphene oxide, and pressurizing in an autoclave; (3) preparing a perfluorosulfonic acid resin solution: putting the perfluorosulfonic acid resin modified material into an autoclave, adding an isopropanol water solution, heating and stirring; and (4) steel belt casting membrane preparation: adding the perfluorosulfonic acid resin solution into a storage tank of a casting machine, keeping the temperature of the storage tank, casting to form a membrane on a transmission steel belt through a casting knife edge, and enabling the transmission steel belt with the membrane to enter a drying oven, thereby obtaining the high-strength water-retention perfluorosulfonic acid proton exchange membrane applied to a fuel cell.