13results about How to "Low swelling rate" patented technology

This invention relates to the field of polymer technology, specifically disclosing an oxyfluorene-containing polyaryl suspended side-chain anion exchange polymer. By introducing an oxyfluorene structure, this invention successfully overcomes the defects of traditional polyaryl ether materials, such as easy main chain breakage and degradation under strong alkaline conditions, thus improving the chemical and thermal stability of the material. The suspension side-chain strategy introduces benzene rings, quaternary ammonium groups, or piperidine cationic groups, effectively promoting microphase separation within the polymer and constructing efficient ion transport channels. This allows the membrane material to maintain a low swelling ratio while achieving good hydroxide ion conductivity, reaching up to 170.2 mS / cm at 80°C. The polymer exhibits excellent mechanical properties, with outstanding dry membrane tensile strength and excellent alkali resistance and durability. After immersion in a strong alkaline (KOH) solution at 80°C for over 1800 hours, its conductivity loss is minimal. The anion exchange membrane prepared by this invention has good application value in fuel cells and water electrolysis for hydrogen production, demonstrating strong commercial potential.

The application discloses a cationic polymer containing a fused ring structure and a preparation method and application thereof, and an anion exchange membrane based on the cationic polymer is prepared by using the cationic polymer containing a fused ring structure in a main chain. By introducing a fused ring structure element into the main chain of the cationic polymer, the interaction force between the formed polymer chains is increased by using the pi-pi interaction between the fused ring structures, the water absorption and swelling of the cationic polymer are inhibited, and thus the anti-swelling ability and the dimensional stability of the anion exchange membrane prepared from the cationic polymer are improved. In addition, by using the high reactivity of the fused ring structure monomer, the molecular weight of the cationic polymer is increased, and other monomers are copolymerized to regulate the performance of the cationic polymer, so that the anion exchange membrane prepared from the cationic polymer has excellent comprehensive performance, and is beneficial to the application in the fields of anion exchange membrane fuel cells and water electrolysis.

The present application relates to ion exchange membrane technical field, particularly to a kind of low swelling crosslinked poly (arylene-quininium salt) anion exchange membrane and preparation method thereof.Poly (arylene-quininium) polymer is dissolved in first organic solvent, and halogenated poly (arylene-alkylene) polymer is added as macromolecular ionization reagent, and quininium group in partially ionized poly (arylene-quininium) polymer is then added with excess small molecule ionization reagent to make quininium group completely ionized, to obtain crosslinked poly (arylene-quininium salt) polymer solution.The obtained crosslinked poly (arylene-quininium salt) polymer solution is added to first precipitant to obtain crosslinked poly (arylene-quininium salt) polymer powder, and it is dissolved in second organic solvent to obtain polymer solution, coated on homogeneous substrate or porous substrate, dried to obtain low swelling crosslinked poly (arylene-quininium salt) anion exchange membrane.The present application uses halogenated poly (arylene-alkylene) as macromolecular crosslinking agent to construct crosslinked network in poly (arylene-quininium salt) ion polymer, so that the obtained crosslinked poly (arylene-quininium salt) anion exchange membrane shows low swelling, high mechanical strength, high alkali resistance and outstanding gas barrier property.

The invention provides an anti-crack easy-to-demould non-adhesion fiber cement board, which is prepared from the following raw materials: a calcium material, a siliceous material, bentonite, mica powder, wollastonite, microfibrillated fiber, HPMC and paper pulp, the calcium material is cement, the siliceous material comprises quartz sand, quartz powder and silica fume, and the mass ratio of the calcium material to the siliceous material is 0.9-1.0. In addition, the invention also provides a preparation method of the anti-crack easy-to-demould non-adhesion fiber cement board. The anti-cracking easy-to-demould non-adhesion fiber cement board is low in curing temperature, short in curing time, energy-saving, green and environment-friendly, relatively low in comprehensive cost, relatively high in density, non-sticky in demould, non-adhesion and crack-free after being discharged from a kettle, good in stability and excellent in performance in a freezing and thawing cycle weather resistance experiment, solves the difficult problems of board sticking, adhesion and the like of a production line, and has a good application prospect. The productivity of a production line is brought into full play, the product percent of pass of the production line is improved, and the manufactured plates can meet the use requirements of external wall panels in extreme climate areas.

This invention provides a method for preparing a magnesium-lithium separation composite membrane, comprising: fibrillating powder A and powder B to obtain mixture C; dry-forming mixture C to obtain a self-supporting dry-forming base membrane; adding PVDF and organic matter D to solvent E to obtain an impregnation solution; immersing the self-supporting dry-forming base membrane in the impregnation solution, and subjecting it to impregnation and drying to obtain the magnesium-lithium separation composite membrane. This invention utilizes a step-by-step synergistic process of fibrillation pretreatment – ​​dry-forming – impregnation composite, combined with multi-component coupling of inorganic powder A – organic framework – impregnated functional layer, to both fully preserve the fibrillated structure and enhance membrane toughness, while achieving a seamless and robust bond between the base membrane and the functional layer. The synergistic effect of PVDF and sulfonated ion-conductive polymers suppresses swelling while constructing a high conductivity pathway. The dry-forming base membrane physically confines and activates the intrinsic sieving ability of powder A, resulting in a membrane with high strength, low swelling, and high magnesium-lithium selectivity, exhibiting excellent overall performance.

This invention discloses a corrosion-resistant tetrapropylene fluororubber sealing material for harsh environments in oil and gas fields, its preparation method, and its application. The sealing material is composed of the following components in parts by weight: 100 parts of tetrapropylene fluororubber raw rubber, 4-10 parts of methacryloxypropyl cage-like polysilsesquioxane, 1-3 parts of peroxide primary crosslinking agent, 30-60 parts of reinforcing filler, and 2-10 parts of processing aid. This invention uses methacryloxypropyl cage-like polysilsesquioxane as a co-crosslinking agent. Its inorganic Si-O-Si cage-like skeleton fundamentally eliminates the technical defects of traditional ester-based co-crosslinking agents, which are prone to hydrolysis, significantly improving the chemical stability of the crosslinking network in high-temperature acidic media. Combined with the synergistic effect of the reinforcing filler, the resulting material can meet the sealing requirements of harsh conditions such as high temperature, high pressure, and multi-media corrosion in oil and gas fields. The preparation process is simple and suitable for industrial production.

This invention discloses a hydrogel patch for repairing gastric perforation and its preparation method, belonging to the field of biomedical materials technology. The preparation method is as follows: Acryloylvaline, acrylic acid, methylenebisacrylamide, compound A, and a photoinitiator are dissolved in an alcohol solvent, and after defoaming, a precursor solution is obtained. The precursor solution is then placed in a mold and cured by ultraviolet light. The resulting hydrogel is immersed in a hydrochloric acid solution to displace the alcohol solvent, yielding the hydrogel patch for repairing gastric perforation. The hydrogel patch provided by this invention has advantages such as resistance to strong acid corrosion, good biocompatibility, low swelling rate, and stable adhesion under fluctuating pH conditions. This strong and stable adhesion ensures that the hydrogel can adhere reliably and persistently to the gastric perforation site in a dynamic gastric acid environment, providing a stable platform for drug delivery, thereby potentially shortening surgical time and promoting wound healing.

The invention discloses a composite membrane for a high-temperature proton exchange membrane fuel cell as well as a preparation method and application of the composite membrane. According to the composite membrane, polybenzimidazole (PBI) is used as a matrix, chloromethylated polysulfone (CMPSF) is introduced as a covalent cross-linking agent and reacts with imidazole groups in the PBI to form a three-dimensional covalent cross-linked network, and the mechanical strength and dimensional stability of the membrane are remarkably improved; meanwhile, a nitrogen-rich ionic polymer (NIP) synthesized by a specific precursor is introduced, and rich basic nitrogen sites of the NIP can form strong hydrogen bond interaction with phosphoric acid, so that the phosphoric acid adsorption and retention capability of the membrane is greatly enhanced, and additional proton jump sites are provided. Through the synergistic effect, the proton conductivity of the composite membrane exceeds 160 mS cm <-1 >, the tensile strength exceeds 10 MPa and the peak power density reaches 1000 mW cm <-2 > magnitude under the conditions of 160 DEG C and no water, and the composite membrane has excellent long-term stability. According to the invention, the contradiction between the mechanical property and proton conductivity of the traditional phosphoric acid doped PBI membrane is effectively solved, and a reliable electrolyte material is provided for a high-performance and long-life high-temperature proton exchange membrane fuel cell.

The application provides a non-fluoropolymer, a non-fluoropolymer composite diaphragm and application, the non-fluoropolymer includes polymer A and the polymer B at least partially coated on the surface of polymer A, the crosslinking degree of polymer A is X1, the crosslinking degree of polymer B is X2, 5%≤X1≤10%, 50%≤X2≤60%;The non-fluoropolymer composite diaphragm includes base film and coating layer coated on at least one side of base film.The non-fluoropolymer particles of the application have a higher swelling rate at high temperature, also have the reversible characteristics of absorbing and releasing electrolyte, the non-fluoropolymer and the non-fluoropolymer composite diaphragm are applied in the battery, when the battery abnormally heats, the non-fluoropolymer swells rapidly, blocks the ion shuttle channel, avoids the further deterioration of temperature, improves the safety performance of the battery, and when the temperature returns to normal, the non-fluoropolymer particles can restore to the original morphology, restore the ion shuttle channel, so as to not affect the subsequent cycle performance of the battery.

The invention belongs to the technical field of high polymer materials, and particularly relates to a polyvinylidene fluoride copolymer for coating a lithium battery diaphragm as well as a preparation method and application thereof, the polyvinylidene fluoride copolymer is formed by copolymerizing a first monomer, a second monomer and a crosslinking monomer, and has a three-dimensional network structure; by taking 100 parts by mass as the total mass, the mass dosage of the second monomer is 1-20 parts by mass, the mass dosage of the cross-linking monomer is 0-2 parts by mass but not 0 part by mass, and the balance is the first monomer; the first monomer is a vinylidene fluoride monomer; the structural formula of the crosslinking monomer is shown in the specification, and in the formula, n is a positive integer between 2 and 12. Compared with the prior art, the problems that in the prior art, the energy density is difficult to increase due to insufficient bonding force of the PVDF diaphragm, and the stability is poor due to high swelling rate are solved. According to the scheme, a cross-linked three-dimensional network structure is formed among PVDF chain segments through a plurality of double bonds of the cross-linked monomer, so that the purposes of reducing the swelling ratio of PVDF and improving the adhesive strength are achieved.

The application provides an amide-containing polyurethane elastomer and a preparation method and application thereof, and belongs to the field of high polymer materials. The application first provides an amide-containing chain extender, which is prepared from a diamine compound and a compound shown in formula I, a salt or a stereoisomer thereof. Then, the polyurethane elastomer is prepared by using the chain extender, and the polyurethane elastomer has excellent mechanical properties, and the water resistance, solvent resistance and oxidation resistance are significantly improved. In addition, the polyurethane elastomer is prepared by using a solvent-free preparation process, so that the use of organic solvents is avoided, the production environmental protection is improved, and the solvent recovery cost is reduced. Furthermore, the production process is simple, can be applied to large-scale industrial production, has high economic benefits and market competitiveness, and has a good application prospect.

The invention relates to the technical field of batteries, and provides a high-stability self-humidifying proton exchange membrane as well as a preparation method and application thereof. The high-stability self-humidifying proton exchange membrane is prepared from the following raw material components in parts by weight: 10 parts of sulfonated polyetheretherketone, 100 parts of perfluorinated sulfonic acid resin and 5 to 20 parts of ZrP / CeO2 composite material, the ZrP / CeO2 composite material comprises the following raw materials: zirconium phosphate and cerium oxide in a weight ratio of 1: (1-2). According to the technical scheme, the problems of relatively poor stability and relatively low proton conductivity of the proton exchange membrane in related technologies are solved.

The invention belongs to the technical field of biomedical materials, and discloses preparation of a low-swelling medical tissue sealant and application of the low-swelling medical tissue sealant in dura mater repair. The invention discloses a sealant. The sealant is prepared from the following raw materials: multi-arm polyethylene glycol active ester and aminated gelatin. The invention provides a sealant. The sealant is formed by crosslinking multi-arm polyethylene glycol active ester and aminated gelatin through amido bonds. The sealant has the advantages of rapid gelling, high mechanical strength, strong tissue adhesion, ultralow swelling ratio, controllable degradation and excellent biocompatibility. The sealant can realize in-situ sealing and repairing of dura mater injury and prevent leakage of cerebrospinal fluid, has antibacterial, anti-infection and nerve protection effects, is suitable for repairing of dura mater and dura mater, and is especially suitable for minimally invasive neurosurgery.