36results about How to "Low swelling rate" patented technology

The invention provides a low-swelling low-temperature adhesion polyacrylate water-based binder as well as a preparation method and application thereof. The polyacrylate water-based binder is a core-shell polymer obtained by polymerizing a polymeric monomer, polymeric monomers of a core polymer of the core-shell polymer comprise the following monomers in percentage by weight: 50-90% of a hard monomer, 5-30% of a soft monomer and 1-20% of a functional monomer; polymeric monomers of a shell polymer of the core-shell polymer comprise the following monomers in percentage by weight: 35-85% of a hard monomer, 15-60% of a soft monomer and 0-5% of a functional monomer. The polyacrylate aqueous binder provided by the invention is suitable for the lithium ion battery diaphragm, and solves the problems of low adhesion, high energy consumption, no environmental protection, high price and the like of the current binder for the lithium ion battery diaphragm.

The invention discloses self-adaptive Janus supramolecular hydrogel, a preparation method and application of the self-adaptive Janus supramolecular hydrogel as a wet tissue surface adhesive. The hydrogel has an integrated structure and two asymmetric surfaces: an adhesion surface and an anti-adhesion surface. The method is suitable for the wet tissue surface bonding field.

The invention belongs to the field of hydrogel preparation, and particularly relates to a preparation method of SA / CS / Ca < 2 + > dual-network hydrogel, an obtained product and application. The sodium alginate / chitosan / calcium ion (SA / CS / Ca < 2 + >) physical cross-linked double-network hydrogel is prepared through a semi-dissolution acidification sol-gel conversion method and an internal gel method, the hardness and chewiness of the hydrogel can be remarkably improved, and the elasticity and cohesiveness of the hydrogel can be improved; freeze-thaw stability research is carried out on the prepared SA / CS / Ca < 2 + > dual-network hydrogel, the influence of freezing temperature, thawing temperature, freezing and thawing cycle times and other conditions on properties such as gel structure, rheology, swelling rate, moisture distribution and the like is explored, and the result shows that when the freezing temperature is-80 DEG C and the thawing temperature is 4 DEG C, the gel subjected to one-time freezing and thawing cycle has good stability. Through detection and analysis, the hardness is relatively high, the elasticity and cohesiveness are also remarkably improved, the elastic modulus (G ') and the viscous modulus (G' ') of the gel are best, the swelling rate is relatively low, the free water content is relatively low, the bound water content is relatively high, and the gel structure is relatively stable.

The invention provides an asymmetric modified silicon dioxide particle doped sulfonated polyether ether ketone membrane and a preparation method and application thereof, the preparation method comprises the following steps: (1) under a heating condition, mixing surface hydroxylated silicon dioxide particles and paraffin, adding a first solvent, stirring, and cooling to obtain paraffin emulsion droplets; (2) mixing the paraffin emulsion droplets obtained in the step (1) with a sulfydryl-containing silane coupling agent, and reacting to obtain a mixture; and mixing the mixture with a hydrogen peroxide solution, and carrying out oxidation reaction to obtain the asymmetrically modified silicon dioxide particles, and (3) mixing the asymmetrically modified silicon dioxide particles and sulfonated polyetheretherketone, and drying to obtain the asymmetrically modified silicon dioxide particle doped sulfonated polyetheretherketone membrane. The asymmetric modified silicon dioxide particle doped sulfonated polyether ether ketone membrane provided by the invention is low in swelling property, relatively high in proton conductivity and relatively good in ion selectivity, and the performance of a flow battery can be improved when the membrane is used for the flow battery.

The invention provides a cross-linked polybenzimidazole membrane as well as a preparation method and application thereof. The cross-linked polybenzimidazole membrane comprises a cross-linked network structure, main raw materials of the crosslinked polybenzimidazole membrane comprise polybenzimidazole, a crosslinking agent and a pore forming agent, the crosslinking agent is a diepoxy compound or a silane coupling agent with an epoxy bond, and the addition amount of the crosslinking agent relative to the polybenzimidazole is 2wt%-10wt%. The cross-linked polybenzimidazole membrane is high in mechanical strength, good in mechanical stability, low in swelling rate in electrolyte and high in durability; the cross-linking agent and the pore-forming agent selected in the invention can ensure that the cross-linked polybenzimidazole membrane forms a cross-linked network structure.

The invention discloses a polyphenyl sulfone resin and a preparation method thereof, and relates to the field of high-temperature-resistant high polymer materials. According to the method, a feeding mode of firstly adding a solvent and then adding a monomer is adopted, meanwhile, an external circulation pipeline is additionally arranged on equipment, so that secondary decomposition of the monomer is reduced, mixing of raw materials and intermediate products in the reaction process is further increased, the reaction rate is increased, and in a GPC chromatographic curve obtained through gel permeation chromatography testing, the synthesized polyphenyl sulfone is lg (Mw1) gt; 5.3 and 1g (Mw2) 1t; the sum of the percentages of 3.6 and 3.6 accounts for less than 1.2% of the total percentage, and the obtained polyphenyl sulfone has excellent dimensional stability.

The invention provides a modified polyglutamic acid-based tissue adhesive as well as a preparation method and application thereof. The tissue adhesive is composed of the following components: 1-30 wt% of acidic aldehyde polyglutamic acid; 1 to 15 wt% of a linear protein; 1 to 15 wt% of spherical protein; and the balance of water. The tissue adhesive provided by the invention has the advantages of self-healing performance, low underwater swelling rate and stable adhesion to wet tissues in a physiological environment, and can be applied to rapid hemostasis of dynamic wet tissue wounds in the physiological environment and sealing of wound liquid leakage. Experiments show that the tissue adhesive is high in tissue adhesion stability in a wet physiological environment, and the adhesion strength of the tissue adhesive to wet pigskin tissues can reach 37.4 kPa or above after the tissue adhesive is placed for 12 h under the physiological condition.

The invention relates to a dual-stimulus-responsive hydrogel with programmable reversible shape movement (namely bidirectional shape memory) and pH (Potential of Hydrogen). The invention belongs to the field of organic polymer materials. According to the method, stearyl acrylate, acrylic acid and N-isopropylacrylamide are copolymerized through free radical copolymerization, the method is wide in raw material source, simple to operate and easy for industrial production, and the dual-stimulus-responsive hydrogel prepared by the method is a brand new material which is never reported and has wide application prospects. The shape memory characteristic is good, the pH sensitivity is high (the whole period of pH softening / enhancing only needs 5 minutes), and the pH range is wide (1-14). The hydrogel with dual effects (good shape memory characteristic and high pH sensitivity) has wide positive effects on drug delivery, control and release in the biomedical field.

The invention discloses a preparation method of an MOFs reinforced bacterial cellulose membrane as well as a product and application of the MOFs reinforced bacterial cellulose membrane, an in-situ growth method, a polymerization method and a chemical cross-linking method are combined, an MOFs material grows in the cellulose membrane, then modification is performed by using poly (diallyldimethylammonium chloride) with different concentrations and 1, 2, 3, 4-butanetetracarboxylic acid with different concentrations, and the MOFs reinforced bacterial cellulose membrane is obtained. A series of alkaline anion exchange membranes based on bacterial cellulose are synthesized. The prepared cross-linked membrane has good durability under various extreme conditions, relatively low swelling rate and water absorption rate, high conductivity and high mechanical strength, and when the prepared cross-linked membrane is assembled into a flexible zinc-air battery (F-ZAB), the excellent power density of 282.4 mWcm <-2 > can be obtained at room temperature.

The invention provides a binder, a positive pole piece and a secondary battery. The adhesive comprises a first polymer as shown in a formula I, R1 is C5-C12 alkyl, and R2 is any one of C1-C3 alkyl, a hydrogen atom or aryl; the number average molecular weight of the first polymer is 6 * 10 < 4 >-2 * 10 < 6 >. The binder disclosed by the invention basically does not contain a fluorine element, is low in swelling rate and high in binding power, and can inhibit the expansion of the positive pole piece and improve the energy density of the secondary battery when being used in the positive pole piece and the secondary battery.

The invention belongs to the technical field of biomedical materials, and particularly relates to a carboxymethyl chitin composite material for an articular cavity and a preparation method of the carboxymethyl chitin composite material. The carboxymethyl chitin composite material for the articular cavity is prepared by selecting carboxymethyl chitin, hyaluronic acid, sodium alginate and chitosan which are good in biocompatibility as raw materials and performing functional modification treatment respectively, and through the synergistic effect of all the components, the elasticity modulus of the composite material is effectively improved, the swelling rate is reduced, and the joint cavity is more stable. And meanwhile, the composite material also has proper viscosity and degradation performance, and can meet application requirements.

The invention relates to a collagen-based artificial cornea with a double-layer structure and capable of rapidly epithelizing and a preparation method thereof, and the preparation method comprises the following steps: adding collagen into an acetic acid solution, stirring and dissolving, and adding a plasticizer to obtain a high-concentration collagen solution and a low-concentration collagen solution; carrying out electrochemical deposition on the high-concentration collagen solution to obtain a collagen membrane I; carrying out photo-crosslinking on the collagen membrane I through strong ultraviolet irradiation; performing chemical crosslinking on the first collagen membrane to obtain a compact layer; a low-concentration collagen solution is taken and poured into the deposition tank, the compact layer is immersed, secondary electrochemical deposition is carried out, and a second collagen film is obtained on the compact layer; the second collagen membrane is subjected to secondary photo-crosslinking through weak ultraviolet irradiation, a loose layer is obtained, and the loose layer and the compact layer are combined to form the collagen-based artificial cornea which is of the double-layer structure and can be rapidly epithelized. The collagen-based artificial cornea with the double-layer structure and capable of being epithelialized rapidly has high light transmittance and meets clinical mechanical properties, the light transmittance at 600 nm is higher than 90%, the tensile strength of the collagen-based artificial cornea is higher than 1 MPa, and the elastic modulus of the collagen-based artificial cornea is higher than 10 MPa. The swelling rate is low, the tissue compression of the product on the autologous cornea can be avoided, the mechanical stimulation on the eye tissue is reduced, and the comfort after implantation is improved.

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 invention belongs to the field of thermoplastic elastomer material polymerization and catalytic hydrogenation, and particularly relates to an SEBS binder, a preparation method, application and a device thereof. The preparation method comprises the following steps: carrying out a first-stage polymerization reaction on a styrene solution, a regulator and an initiator, carrying out a second-stage polymerization reaction on the styrene solution and butadiene in a micro-channel reaction unit, carrying out a third-stage polymerization reaction on the styrene solution and styrene in a static mixer 1, and terminating the reaction through an end-capping reagent to obtain an end-capped SBS solution; and mixing the terminated SBS solution with a homogeneous catalyst through a static mixer 2, and introducing the mixture into the autoclave reaction unit for hydrogenation reaction to obtain SEBS (Styrene-Ethylene-Butylene-Styrene). Compared with a traditional intermittent kettle type polymerization and hydrogenation technology, the technology for preparing SBS through continuous polymerization is good in mass and heat transfer and high in efficiency, and the obtained product is excellent in quality. The method has a wide market application and development prospect in industrial continuous preparation of green and high-end SEBS (Styrene-Ethylene-Butylene-Styrene).

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 invention discloses an injectable tissue adhesive and application thereof, and belongs to the technical field of tissue adhesives. The tissue adhesive is mainly formed by compounding a hydrophilic polymer and a block polymer, wherein the hydrophilic polymer is selected from at least one of polyethylene glycol, polyvinyl alcohol, gelatin, hyaluronic acid, alginic acid and chitosan; the block polymer is poloxamer; the hydrophilic polymer is composed of more than two types of hydrophilic polymers with molecular weights, the poloxamer is composed of more than two types of poloxamers, the hydrophilic polymer and the block polymer are covalently connected through a cross-linking group, and the adhesion time of tissues is remarkably prolonged through matched use of the hydrophilic polymer and the block polymer. The tissue adhesive disclosed by the invention has excellent adhesion performance, and can be used as a wound sealing dressing, a tissue anti-adhesion material and an implanted instrument coating in the field of biomedicine.

The invention discloses xylooligosaccharide fruit juice popping capsules and a preparation method thereof. The xylooligosaccharide fruit juice popping bead comprises a compound colloid coating and a fruit juice core material, the coating comprises sodium alginate, carrageenan and guar gum, the fruit juice core material comprises green extract juice, white granulated sugar or high fructose corn syrup, a thickening agent, calcium lactate, purified water and xylooligosaccharide, and the coating and the core material are prepared by scientifically proportioning the raw materials, so that the raw materials synergistically play a role. And adopting a reverse spheroidizing technology to obtain the fruit juice popping bead. According to the xylooligosaccharide fruit juice popping bead provided by the invention, the popping bead contained in the popping bead is bright and glossy in color, round and full in ball shape, high in transparency, moderate in sour and sweet taste, appropriate in coat thickness, obvious in pulp popping feeling, rich in natural fruit juice and functional oligosaccharide, higher in nutritional value and beneficial in effect, and when the popping bead is matched with a fruit tea beverage for eating, the taste is unique; the tea is nutritional, healthy and suitable for people of all ages.

The invention relates to the technical field of medical materials, in particular to hydrogel for biological tissue bonding and a preparation method and application thereof. The hydrogel for biological tissue adhesion comprises a first component, a second component, a third component and a fourth component, the first component and the second component form electrostatic interaction, and the third component and the fourth component form a covalent cross-linked structure; the first component, the second component, the third component and the fourth component are all biocompatible components. The hydrogel for biological tissue adhesion provided by the invention has excellent biocompatibility, relatively high adhesion strength and relatively low swelling property.

The present invention discloses a composite proton exchange membrane, which comprises a matrix and a filler; the matrix comprises sulfonated polyetheretherketone; the filler comprises sulfonated ZIF-derived porous carbon material and sulfonated carbon nanotubes. The composite proton exchange membrane provided by the present invention has the advantages of low methanol permeability, low swelling rate and high proton conductivity. By filling the sulfonated ZIF-derived porous carbon material and sulfonated carbon nanotubes, the proton conductivity of the composite proton exchange membrane can be improved, and the penetration of fuel can be blocked at the same time; the present invention overcomes the disadvantage of the instability of zinc-based ZIF in an acidic environment by carbonizing the zinc-based ZIF, making it suitable for preparing the composite proton exchange membrane; the preparation method of the composite proton exchange membrane is simple, efficient, low-cost, and has the advantage of being industrially produced; the composite proton exchange membrane can be widely used in fuel cells.

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 discloses an injectable dura mater sealant with adjustable mechanical properties as well as a preparation method and application thereof. The dura mater sealant comprises the following components in percentage by mass: 75-95% of a polymer; 1-20% of modified nano cellulose; 1-5% of an antibacterial agent; 0.1 to 0.5 percent of analgesic medicine; and a color marker is 0.01 to 0.05 percent. The dura mater sealant can form gel in a short time through rapid reaction between polymers; the protein in the tissue quickly reacts with the polymer, so that the dura mater sealant can be instantly adhered to the surface of the tissue and has high adhesion; due to the addition of the modified nanocellulose, the prepared dura mater sealant has adjustable and relatively high mechanical strength, and leakage of cerebrospinal fluid can be effectively prevented. The prepared dura mater sealant has the advantages of being short in gelation time, adjustable in mechanical property, high in adhesion and the like, and has a good application prospect in dura mater sutureless sealing.

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.

The invention relates to the technical field of plugging materials, in particular to a preparation method and application of a graphene / cellulose hybrid composite aerogel plugging material.The preparation method comprises the following steps that A, graphene oxide dispersion liquid is prepared and heated and stirred to adjust the pH value to 4.5-8.5; b, sequentially adding hydroxypropyl methyl cellulose, polyvinyl alcohol, polyacrylamide and a sodium borate solution into the graphene oxide dispersion liquid treated in the step A at intervals to obtain a modified graphene dispersion liquid; and C, heating, preserving heat and dialyzing the modified graphene dispersion liquid obtained in the step B, repeating freezing and unfreezing for at least two times after dialyzing, performing freeze drying, and performing thermal annealing treatment in an inert atmosphere to obtain the graphene / cellulose hybrid composite aerogel plugging material. The dense holes in the surface and the interior of the composite aerogel plugging material are beneficial to absorption of oil to form a more compact plugging network structure layer, a good filling and covering effect on cracks is achieved, and the cracks are effectively plugged.

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 present invention belongs to the field of medical materials, and in particular to a highly stable bio-glue matrix and a preparation method thereof. The bio-glue matrix includes a cross-linked acellular matrix extract, and the cross-linked acellular matrix extract accounts for 42-91wt% in the bio-glue matrix. The present invention obtains a highly stable bio-glue matrix with a suitable gel time, good biodegradability, biocompatibility, and biosafety, and has a low swelling rate. At the same time, it has a gain effect on tissue repair, and can solve the problems of existing medical adhesives being toxic, risky, and high swelling.

The invention discloses a low-chlorine catalyst for preparing propylene carbonate. The low-chlorine catalyst for preparing propylene carbonate of the invention has the following chemical composition by mass: nitrogen content of 3.6-10.9%, oxygen content of 12.1-14.4%, bromine content of 6.1-9.0%, chlorine content of 0.1-0.4%, samarium content of 12.2-17.2%, Si content of 2.3-2.7%, and the remainder of carbon and hydrogen. The catalyst of the invention has the characteristics of high activity and low cost, the catalyst has significant stability, and the active component is not easy to lose during the reaction; at the same time, the catalyst has a low chlorine content, the corrosion to the equipment is small, and the propylene carbonate product has good quality.

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.