8results about How to "High oxygen permeability" patented technology

The invention belongs to the technical field of hydrogel materials, and discloses a carboxylated chitosan modified silicone hydrogel contact lens material and a preparation method thereof. The preparation method comprises the following steps: mixing a siloxane monomer, a zwitterionic monomer, a first cross-linking agent, an initiator and a first organic solvent, and carrying out polymerization reaction to obtain silicone hydrogel; and mixing the silicone hydrogel, carboxylated chitosan, a second cross-linking agent and a second organic solvent, and carrying out a cross-linking reaction to obtain the carboxylated chitosan modified silicone hydrogel contact lens material. The zwitterionic monomer is introduced into the siloxane monomer polymerization process, and the carboxylated chitosan is adopted to modify the silicone hydrogel, so that the protein adsorption resistance and antibacterial property of the contact lens material are effectively improved. Meanwhile, the raw materials are wide in source, the preparation method is simple and easy to operate, and large-scale industrial production can be achieved easily.

The invention relates to a method for reducing the content of residual monomers in a polymer composition, the polymer composition, a composition capable of free radical polymerization, a polymer preparation method, a polymer and application.

The invention relates to the technical field of overwintering storage of peony seeds in alpine regions, and discloses an overwintering storage method and storage device for peony seeds in alpine regions, the storage device comprises a passive heating mechanism, and the passive heating mechanism is fixedly mounted in a supporting cylinder. The overwintering storage method for the peony seeds in the alpine region comprises the steps that firstly, sand is stirred, a sand layer is laid, and the peony seeds are placed; secondly, the storage barrels and the storage plates are placed in a combined mode; thirdly, passive geothermal heating is conducted on the heat preservation barrel; 4, oxygen is introduced into the heat preservation cylinder at regular time, humidity is automatically controlled, and temperature is monitored in real time; and step 5, determining the low-temperature sand storage time of the peony seeds. The method has the beneficial effects that a temperature guarantee is provided for low-temperature sand storage stratification treatment in the alpine regions of the peony seeds, and through automatic control over ventilation, oxygen supply and humidity of the storage device, the appropriate humidity of the sand layer is kept, and the problem that the peony seeds are mildewed due to oxygen deficit in the overwintering storage process is solved.

The invention relates to a PVA-based oxygen-permeable and moisture-permeable strain sensor and a preparation method thereof, and the preparation method comprises the following steps: S1, preparing a modified PVA raw material: uniformly mixing PVA powder, modified bamboo powder, graphene oxide and a silane coupling agent, and then carrying out blending extrusion to obtain a granular raw material; s2, PVA dispersion liquid preparation: mixing and grinding bamboo charcoal powder and a dispersing agent in water, filtering, adding a modified PVA raw material into filtrate, and dissolving to obtain the PVA dispersion liquid; s3, preparing a gel thin-film resistor disc: putting the dispersion liquid into a mold, repeatedly freezing and thawing to obtain thin-layer gel, applying pressure by using a pressing block in a closed cavity, and controlling the humidity to obtain the gel thin-film resistor disc; and S4, in-situ conductivity enhancement: immersing the gel thin-film resistor disc into an ethanol solution of thiophene derivatives and iodine, taking out the gel thin-film resistor disc after the gel thin-film resistor disc is immersed, drying, and carrying out in-situ solid-state polymerization, so as to obtain the gel thin-film resistor disc. And S5, electrode fixation: fixing conductive electrodes at two ends. The strain sensor has the advantages that the obtained strain sensor has relatively high oxygen and moisture permeability and also has proper strength and relatively high conductivity.

The invention discloses a drug-loaded contact lens and a preparation method thereof, and the preparation method comprises the following steps: dissolving a drug in a mixed solution of a surfactant, a cosurfactant and deionized water to prepare a drug microemulsion; the preparation method comprises the following steps: uniformly mixing a silicon monomer, a hydrophilic monomer, a cross-linking agent and an initiator by ultrasonic waves, and carrying out compression molding, photopolymerization or thermal polymerization and demolding to obtain the contact lens, and soaking the contact lens in the drug microemulsion to obtain the drug-loaded contact lens. The maximum drug loading capacity of the contact lens is 215.17 to 217.47 [mu] g / lens. The drug microemulsion prepared by the method is uniform in particle size and stable in morphology. The contact lens can efficiently load the medicine, the bioavailability of the medicine is improved, the basic performance of the medicine-loaded contact lens is stable, and the wearing comfort is improved; the prepared drug microemulsion not only has uniform particle size and stable morphology, but also can effectively reduce the surface contact angle of contact lenses.

This invention belongs to the field of contact lens technology, and provides a moisturizing protein-based contact lens and its preparation method. The preparation method includes the following steps: mixing a silk fibroin solution and a hyaluronic acid-binding protein solution to obtain a protein mixture solution; mixing a hydrophilic modification component, an oxygen-permeable modification component, and water to obtain a composite modifier; mixing the protein mixture solution, the composite modifier, and a crosslinking agent to obtain a pre-crosslinked mixture; molding the pre-crosslinked mixture and performing gradient crosslinking, followed by sequential soaking in buffer solution, rinsing, and sterilization to obtain the moisturizing protein-based contact lens. The contact lens of this invention uses protein as the main component, does not rely on silicon-based substances or harmful crosslinking agents, and possesses high biocompatibility, high oxygen permeability, suitable mechanical properties, and controllable degradation.

The invention provides a silicone hydrogel lens as well as a preparation method and application thereof, and belongs to the technical field of contact lenses. According to the invention, an organic silicon monomer is taken as a main body, a composite formula system of a high-oxygen-permeability silicon-based skeleton and a hydrophilic functional monomer is adopted, and a physical mixing process is adopted to realize dual-advantage fusion and accurate proportion of each core component, so that a product system with both oxygen permeability and comfort is obtained, and safe, comfortable and healthy vision correction choices are provided for consumers.

The present application relates to a kind of PHEMA hydrogel and its preparation method, belong to hydrogel technical field, including the following mass parts raw materials: 2-hydroxyethyl methacrylate, reinforcing agent, solvent, crosslinking agent, initiator and slow-release agent;Preparation method includes the following steps: crosslinking agent is dispersed in 2-hydroxyethyl methacrylate, then reinforcing agent and slow-release agent are dispersed in solvent, and ultrasonic treatment is carried out, subsequently initiator is added dropwise to system, and make the reaction reflux 3 hours at 80 DEG C, after reaction, wash with deionized water, and dry, obtain PHEMA hydrogel.The technical scheme in the present application, by incorporating [2-(methacryloyloxy) ethyl] dimethyl-(3-sulfopropyl) ammonium hydroxide, can enhance biocompatibility and antifouling performance, also can adjust the water content and pore of hydrogel, play the role of balancing optical transparency and oxygen permeability.