184results about How to "Low swelling rate" patented technology

The present invention relates to an acrylic pressure sensitive adhesive composition comprising (meth)acrylic copolymers including alkyl(meth)acrylic acid ester monomer having 1˜12 carbon atoms of alkyl group, characterized in that the gel content is 10˜55%, the swelling ratio is 30˜110, the weight average molecular weight of sol eluted from the adhesive by ethyl acetate is at least 800,000, the molecular weight distribution is 2.0˜7.0; and a polarizer and a liquid crystal display comprising the above composition show excellent durability under a high temperature and humidity condition, and can improve the light leakage phenomenon and provide excellent operability at the time of manufacturing polarizer by effectively providing high modulus and stress release property.

The invention provides chitosan controlled release fertilizer microspheres and a preparation method thereof. The controlled release fertilizer consists of biodegradable chitosan, polyvinyl alcohol, sodium alginate and a chemical fertilizer. The preparation method comprises the following steps: dissolving chitosan in an acetic acid solution; dissolving the chemical fertilizer and polyvinyl alcohol in the chitosan acetic acid solution; adding an ion crosslinking agent to obtain microspheres; and putting the microspheres in a sodium alginate solution for ultrasonic vibration to form the chitosan controlled release fertilizer microspheres. In the process of crosslinking to form the microspheres, fertilizer molecules are adhered and wrapped in crosslinked network micropores of the chitosan microspheres, so that the solubility and releasing capacity of the fertilizer molecules are changed and nutrients are slowly released along with degradation of the chitosan microspheres. At the same time, a sodium alginate electrolyte membrane is wrapped on the surfaces of the microspheres, thereby reducing the burst release phenomenon of nutrients generated in the initial release stage. The controlled release fertilizer is simple in preparation process, relatively low in cost, environmentally friendly and non-toxic and suitable for industrial production.

The invention discloses a bio-medical adhesive, which can be cross-linked with a wound in situ, and a preparation method of the bio-medical adhesive. The preparation method is characterized by comprising the steps of first, preparing oxidized sodium alginate by using sodium periodate to oxidize sodium alginate; dissolving the oxidized sodium alginate in an MES (Methyl Ester Sulfonate) buffer solution, dissolving 1-(3-dimethyl aminopropyl)-3-ethyl carbodiimide hydrochloride and N-hydroxyl succinimide in the MES buffer solution as well under nitrogen protection, continuously adding dopamine, carrying out dialyzing and freeze-drying after reacting for 8 to 24 hours, and obtaining A liquid by dissolving a reaction product in a PBS (Phosphate Buffer Solution) or a sodium borate solution; then, dissolving I-shaped collagen in an acid solution, and obtaining B liquid by neutralizing the solution pH (potential of Hydrogen) to be 5 to 8; firstly pre-treating the wound by using hydrogen peroxide or HRP (Horse Radish Peroxidase) before the bio-medical adhesive is used, then immediately coating the wound with the bio-medical adhesive after mixing the A liquid with the B liquid, and forming gel in 30 to 120 s, wherein the gel is firmly adhered to the surface of the wound. The bio-medical adhesive disclosed by the invention has a stronger adhesive force under a moist environment in vivo, integrates filling, sealing and bleeding stopping functions, is good in biocompatibility, is bio-degradable and can be used for promoting wound healing.

The invention relates to a method for preparing proton exchange membrane with polyvinylidene fluoride grafted and grafting copolymerized with 2-acrylamido-2-methylpropanesulfonic acid, which belongs to the field of battery electrolyte material. The method comprises: dissolving a silicon compound in water-containing N-methyl pyrrolidone solution; adding polyvinylidene fluoride PVDF and 2-acrylamido-2-methylpropanesulfonic acid (AMPS) to the solution; adding initiator; heating and stirring; casting the solution onto a clean glass plate; drying the obtained product; and removing membrane to obtain graft copolymer membrane with modified PVDF and 2-acrylamido-2-methylpropanesulfonic acid. The proton exchange membrane prepared by the method not only has good proton-conducting pieces, but also is convenient for mass production.

A method for producing collagen-based scaffolds with improved characteristics, which broadens the usage of collagen in tissue engineering and the products so produced are described. The method comprises reconstitution of three-dimensional collagen matrices from collagen monomer solution and crosslinking the matrix with a light source in the presence of a photosensitizing reagent. The crosslinked products can be in any shape and form and used in the dry or wet state, for applications including but not limited to tissue engineering and controlled drug delivery.

The invention discloses a preparation method of mussel-imitated contact antibacterial hydrogel for tissue repair. The preparation method comprises the following steps: adopting methacryl amidated dopamine, anionic monomer and cationic monomer for copolymerization to generate triblock copolymer with opposite charges and mussel-imitated functional groups, doping quaternary ammonium salt modified natural polymer with positive charges into the triblock copolymer to prepare enhanced contact antibacterial ultra-strong polyelectrolyte hydrogel with a semi-interpenetrating network structure. The preparation method disclosed by the invention has the beneficial effects that due to existence of the cationic monomer and natural polymeric modified quaternary ammonium salt, the hydrogel has good antibacterial property; the methacryl amidated dopamine and the surfaces of bacteria generate mutual action to capture the bacteria, so that the antibacterial efficiency of the hydrogel is enhanced; simultaneously, the methacryl amidated dopamine can promote cell adhesion, so that the hydrogel has good cell affinity; in addition, the hydrogel prepared by the invention also has good mechanical property, stable swelling property and self-healing property and can be applied to tissue repair.

The invention discloses a crosslinking type polymer anionic membrane and a preparation method of crosslinking type polymer anionic membrane. Anionic membrane takes a polymer containing chloromethyl group as a main chain; in preparation, the chloromethylation of polymer anionic membrane and ionization of the main chain are carried out successively, a biguanide or multi-guanide structural aquogel is prepared, and the aquogel performs thermal polymerization at original site in the membrane to form a membrane; at last, through the alkali treatment, the anion-exchange membrane is obtained. The guanidine type polymer contains a lot of guanidine radicals capable of conducting anion easily, and the ion conductivity can be effectively improved; the water-retaining ability of silane can also improve the ionic conduction ability of the membrane; the ion group is free from beta-H, so that Hofmann degradation can be eliminated; the super absorbent and inflation resistance of aquogel can improve water content of membrane, reduce OH- salvation degree, lighten attack of ON- to ion base, and improve the alkali stability of the membrane; the crosslinking structure can further inhibit the membrane swelling. The prepared membrane is high in water absorbent, low in swelling rate, and able to obviously improve the alkali stability of the membrane.

The invention relates to a water-based high-viscosity glued diaphragm, a preparation method thereof and an application of the diaphragm in a battery. The water-based high-viscosity glued diaphragm comprises a base membrane, and a positive polymer layer and a negative polymer layer which are respectively arranged at two sides of the base membrane, wherein a positive ceramic layer is arranged between the base membrane and the positive polymer layer, and/or a negative ceramic layer is arranged between the base membrane and the negative polymer layer; a binder in the positive polymer layer and a battery positive electrode piece is the same type of binder, and a binder in the negative polymer layer and a battery negative electrode piece is the same type of binder. The diaphragm disclosed by theinvention has the characteristics of small coating amount of coatings on two sides, light and thin coatings, high cohesiveness and the like, so the shaping effect of a battery cell is optimal, and module boxing is facilitated; meanwhile, a module limiting effect is achieved. Moreover, the risk of hole blockage of the diaphragm is low, so the internal resistance of the battery cell is stable and controllable, the lithium precipitation risk is reduced, and the cycle life and safety performance of the battery cell are ensured.

The invention relates to a rare-earth boride/boron carbide composite neutron absorption material and a preparation method thereof, wherein the rare-earth boride/boron carbide composite neutron absorption material is prepared from the following raw material components in parts by weight: 65-90 parts of boron carbide powder, 5-25 parts of rare-earth compound, and 5-10 parts of sintering auxiliary; the preparation method comprises the steps of mixing, ball-milling, forming and sintering the raw materials; and the highest sintering temperature is 1600-2250 DEG C. The rare-earth boride/boron carbide composite neutron absorption material disclosed by the invention has the characteristics of being high in neutron absorbability and low in turgescence and can be used as a ceramic material for a control rod, an adjusting rod, an accident rod, a safety rod and a shielding rod of a nuclear reactor.

The present invention relates to a blanket for offset printing and a manufacturing method thereof. The blanket for offset printing according to an exemplary embodiment of the present invention comprises a cushion layer, a support layer, and at least two surface printing layers, wherein the at least two surface printing layers comprise a silicon-based resin in which at least one of a hardness value, a fluorine group content value, and a silicon oil content value is different. The blanket for offset printing according to the exemplary embodiment of the present invention comprises the surface printing layer formed in at least two layers to prevent the surface printing layer from being swollen due to ink, thereby reducing a process waiting time and improving a process margin.

The invention relates to a polysiloxane and glycidol-containing strong-hydrophobicity gelatin leather finishing agent and a preparation method. The preparation method comprises the following steps: dissolving gelatin in water to prepare aqueous solution with mass concentration of 2-20 percent; adding glycidol into a first reaction flask under the conditions of temperature of 40-70 DEG C and pH of 6-12 to obtain solution 1; adding a surfactant into a second reaction flask, continuously stirring, and meanwhile adding Si-O-Si repetitive unit-containing epoxypolysiloxane in batches or continuously to obtain solution 2, wherein the using amount of the surfactant is 0.5-20 percent of the mass of the gelatin; mixing the solution 1 and the solution 2 in different proportions, weighing 15-20 g of the mixed solution to be placed in a mold of polytetrafluoroethylene, adding 5-10 mL of one or two or three of ethanol, tetrahydrofuran and methanol and drying in a normal pressure drying oven at the temperature of 40-80 DEG C to obtain the gelatin leather finishing agent with a superior function. The finishing agent has the characteristics of strong hydrophobicity, super extensibility, heat resistance, oxidation resistance, wet scrubbing resistance and the like.

The invention discloses a heat storage and preservationhydrogel finishing agent for textile products and a preparation method of the heat storage and preservationhydrogel finishing agent. The preparation method comprise the following steps: mixing and dissolving 100 parts of N-isopropylacrylamide, 25-200 parts of chitosan and 1-3 parts of N,N-methylene-bisacrylamide at room temperature; adding 1-3 parts of potassium persulphate, then adding 1-3 parts of sodium hydrogen sulfite, and stirring uniformly for reaction at normal temperature for at least 24 hours to obtain a hydrogel; and drying the hydrogel at 60-80 DEG C, and grinding the dried hydrogel to prepare hydrogel powder. The heat storage and preservationhydrogel finishing agent is suitable for performing heat storage and preservation functional finishing on pure cotton fabrics, and is good in washing resistance.

The invention relates to a cross-linked anion exchange membrane based on polyphenyl ether/polyvinyl alcohol and a preparation method thereof. In the invention, bromomethylated polyphenyl ether is usedas a membrane matrix, imidazole functionalized polyvinyl alcohol is used as a functional macromolecular cross-linking agent, wherein a cross-linked structure is formed while functionalization is performed, and the cross-linked anion exchange membrane is convenient and efficient. The raw materials polyphenyl ether and polyvinyl alcohol used in the preparation process are environment-friendly materials, are relatively low in cost, and have a good application prospect in alkaline anion exchange membrane fuel cells. The fuel cell performance of the film has the following advantages: 1, the mechanical property is good, the tensile strength can reach 46 MPa at most, and the elongation at break is 10 +/- 1.8% at most; 2, the conductivity is high, and the conductivity of hydroxyl ions at 80 DEG Ccan reach 78 mS/cm and is higher than that of most anion exchange membranes; 3, the size stability is good, and the water absorption swelling ratio at 80 DEG C does not exceed 40%; and 4, the alkaliresistance is good, and the conductivity can still be kept at 76% of the initial value after soaking in a 1M NaOH aqueous solution at 80 DEG C for 500 hours.

The invention discloses a norbornene type compound shown as a structural formula (I). Carbic anhydride and 4,4'-diaminodiphenyl ether are used as raw materials to synthesize an intermediate of 4,4'-di(norbornene-5,6-diamide) para-phenylate; the intermediate is reduced through reduction reaction by using lithium aluminum hydride as a reducing agent, so as to prepare the norbornene type compound. The norbornene type compound can be used as a cross-linking agent to be applied to the preparation of a norbornene type anion exchange membrane, so that the dimensional stability and the mechanical strength of the anion exchange membrane are improved. The structural formula is shown as the accompanying drawing. The structural formula (I) is shown in the description.

The invention belongs to the field of antibiotic preparation technologies, and more specifically relates to a preparation method of vancomycin with high purity. The preparation method comprises following steps: a destaining solution of vancomycin is subjected to column chromatography in a chromatography media, wherein the chromatography media is UniPMM50CAR, the NH4HCO3 mass concentration of a mobile phase of column chromatography is 0.2 to 0.7%; when absorbance rises to 40 at a detection wavelength of 280nm, chromatography liquids are collected segment by segment, the pH value of the chromatography liquids is adjusted to 3.0 to 3.5, the chromatography liquids are preserved under 4 DEG C, and the collected chromatography liquids are mixed. Bubbles in the chromatographic column caused by degradation of carbonate are not likely to generate by using the preparation method. The preparation method is capable of increasing stage number and separation efficiency. The appearance of the obtained vancomycin is improved significantly, purity is as high as 99%, and the vancomycin can be taken orally or by injection.

The invention discloses a preparation method of a layered composite proton exchange membrane for a fuel cell. The preparation method comprises the following steps: performing alternate membrane-forming on a proton polymer solution and a mixed solution of a proton polymer solution and a two-dimensional inorganic nano-material so as to obtain the layered composite proton exchange membrane. After the layered composite proton exchange membrane is soaked in phosphoric acid, the swelling ratio is greatly reduced, the mechanical property is greatly improved, the assembly of a membrane electrode in the medium temperature proton membrane fuel cell is facilitated, and meanwhile, the electrical conductivity is further improved.

The invention provides a medical tissue closing glue composition, medical tissue closing glue and a preparation method and application thereof. The medical tissue closing glue composition comprises a first component and a second component, wherein the first component comprises an amino containing natural substance and/or a first modified product obtained by modifying the amino containing natural substance with sulfydryl groups, and the amino containing natural substance and the first modified product respectively have ten or more active groups which are amino groups and sulfydryl groups; the second component comprises a second modified product obtained by modifying chitosan and/or polylysine with ten or more vinyl groups. The medical tissue closing glue has high rupture strength, a low swelling ratio and good adhesiveness, tissue wound surfaces can be quickly closed, the effect of closing tissue is effectively achieved, interstitial fluid or blood or cerebrospinal fluid is prevented from leaking, the pain of a patient can be relieved, and more danger is avoided.

Disclosed are a battery isolating strengthening membrane and a preparation method thereof. The battery isolating strengthening membrane is characterized by being prepared from a biaxially oriented expanded polytetrafluoroethylene microfiltration membrane, which achieves a longitudinal tensile strength of 25-30 Mpa, a transverse tensile strength of 20-25 Mpa, a longitudinal elasticity modulus of 70-80 Mpa, a transverse elasticity modulus of 50-60 Mpa, and longitudinal and transverse maximum force of 3-4 N. The preparation method of the battery isolating strengthening membrane comprises the steps of material blending, pushing, extrusion, rolling, lubricant removal, longitudinal orientation, thermal treatment, cooling and shaping, transverse orientation, thermal formation and cooling formation. The battery isolating strengthening membrane is prepared through reasonable processes of multiple orientation, thermal treatment at temperature higher than normal melting point, and cooling; the prepared battery isolating strengthening membrane is an orderly arranged crystallized structural membrane, which is low in knotting, high in tensile strength and elasticity modulus, and good in creep resistance, hardness and dimensional stability and the like. With longitudinal and transverse strengths closely similar, the prepared battery isolating strengthening membrane can not only be better in dimensional stability and higher in mechanical performance, but also significantly reduce battery internal resistance to improve the battery performance and reduce membrane material consumption and thecost.

The invention relates to a composite binder for a lithium ion battery, a positive pole slurry of the lithium ion battery and the lithium ion battery and belongs to the technical field of lithium ion batteries. The composite binder for the lithium ion battery is prepared from, by weight, 94-98 parts of adhesive and 1-3 parts of ethylene carbonate. The composite binder for the lithium ion battery contains the adhesive, is also added with the ethylene carbonate and is adopted to prepare a pole piece, the compatibility of the binder and electrolyte in the pole piece can be improved, change of an electrode material layer on the pole piece can be avoided in the charge and discharge process of the lithium ion battery, the stability of the electrode material layer is improved, and further the cycle performance of the lithium ion battery is improved.

The invention relates to a polysiloxane and quaternary ammonium salt-containing antibacterial gelatin leather finishing agent and a preparation method thereof. The preparation method comprises the following steps: dissolving gelatin in water to prepare aqueous solution with mass concentration of 2-20 percent; adding epoxy quaternary ammonium salt into a first reaction flask under the conditions of temperature of 40-70 DEG C and pH of 6-12 to obtain solution 1; adding a surfactant into a second reaction flask, continuously stirring, and meanwhile adding Si-O-Si repetitive unit-containing epoxypolysiloxane in batches or continuously to obtain solution 2, wherein the using amount of the surfactant is 2-20 percent of the mass of the gelatin; mixing the solution 1 and the solution 2 in different proportions, weighing 15-20 g of the mixed solution to be placed in a mold of polytetrafluoroethylene, adding 5-10 mL of one or two or three of ethanol, tetrahydrofuran and methanol and drying in a normal pressure drying oven at the temperature of 40-80 DEG C to obtain the multifunctional gelatin leather finishing agent. The finishing agent has the characteristics of antibacterial property, adjustable hydrophilia and hydrophobicity, flexible film, strong anti-oxidant capacity and the like.

The invention discloses a preparation method of a catalyst applied to preparation of propylene carbonate from CO2 and epoxypropane. The preparation method comprises the following steps: (1) reflowing alkyl imidazole and chloromethyl polystyrene microspheres in a methylbenzene solvent for 12-36 hours, filtering, washing with methylbenzene and propylene carbonate respectively, performing vacuum drying for 12-24 hours at 60-80 DEG C to prepare an active component A; (2) crushing and mixing the active component A together with zinc salt, phenolic resin and methenamine to obtain powder, tabletting and moulding to obtain an active precursor B; (3) heating the active precursor B for 0.5-4 hours at 120-200 DEG C under the production of nitrogen, and crushing the active precursor B into 20-40-mesh particles to obtain a catalyst C. The catalyst prepared by the preparation method achieves catalytic reaction for stably synthesizing the propylene carbonate from CO2 and epoxypropane by a long period on a fixed bed reactor.

The invention relates to an alkaline anion exchange membrane and a preparation method thereof. A composite membrane is prepared by carrying out ultrasonic dispersion mixing on an inorganic nanofiller with chloromethylated polyether-ether-ketone polymer as matrix and imidazole substance as ionic agents. The inorganic nanofiller is nanometer zirconium oxide, nanometer zinc oxide or nanometer titania. The polyether-ether-ketone used by the invention is high-performance commercialized polymer materials of aromatic semicrystalline thermoplastic polymer and has high chemical stability, high heat stability and a high mechanical property; the inorganic nano-materials have excellent water-absorbing quality, an excellent mechanical property and certain hydroxyl transmissibility. The preparation method of the organic-inorganic composite membrane of the invention is simple and easy to industrialize, and the composite membrane of the invention can be applied to an alkaline fuel cell.