11 results about "Poly-N-vinylcaprolactam" patented technology

The invention discloses a composite additive for a water-soluble quenching medium and a preparation method of the composite additive. The composite additive is prepared from the following components in parts by weight: 10 to 20 parts of polyisobutene maleic anhydride, 7 to 20 parts of polyvinyl caprolactam, 1.5 to 3.5 parts of polyacrylamide, 5 to 9 parts of organic alcohol amine, 0.5 to 0.7 part of an antirust agent, 0.5 to 0.9 part of a bactericidal mildew preventive, 0.3 to 0.5 part of a de-foaming agent and 30 to 50 parts of water. The composite additive can be efficiently mixed and dissolved with a traditional water-soluble quenching medium, the water-soluble quenching medium is promoted to achieve control over the low-temperature cooling speed and the lower characteristic temperature in the quenching technological process, and therefore the application range of the water-soluble quenching medium is widened, the quality of a quenched workpiece is improved, and the service life of the workpiece is prolonged. The composite additive disclosed by the invention not only solves the problem of low characteristic temperature of the existing water-soluble quenching medium, but also can enable the water-soluble quenching medium to keep proper maximum cooling speed and high characteristic temperature, and finally shows the cooling performance close to that of quenching oil.

The invention discloses a temperature response type antibacterial packaging fresh-keeping film as well as a preparation method and application thereof, and belongs to the technical field of fruit packaging fresh-keeping. The preparation method comprises the following steps: mixing polyvinyl alcohol (PVA) and polyvinyl caprolactam (PNVCL), stirring and dissolving to obtain a shell solution; the preparation method comprises the following steps: mixing polylactic acid (PLA) and hexafluoroisopropanol, stirring and dissolving to obtain a PLA solution, adding cinnamon essential oil (CEO), and uniformly stirring to obtain a core layer solution; degassing and standing; and performing coaxial electrostatic spinning on the shell layer solution and the core layer solution to obtain the fresh-keeping film. The fresh-keeping film has good hydrophilicity, antibacterial property and oxidation resistance, can intelligently respond to environment temperature change to realize CEO slow release, can effectively delay softening, decaying and deterioration of the picked waxberries, and remarkably prolongs the fresh-keeping period.

The present application relates to a kind of Williamson method preparation LCST controllable temperature-sensitive lignin and preparation method and application.The preparation method of the Williamson method preparation LCST controllable temperature-sensitive lignin, comprising the following steps: the activation of lignin sulfonate;N-vinyl caprolactam modification: initiator, N-vinyl caprolactam, modifier are dissolved in solvent one after heating, namely obtained;Temperature-sensitive lignin preparation: after the activation of lignin sulfonate is dissolved in solvent two, modified poly N-vinyl caprolactam, pH regulator, catalyst, heating is obtained.The present application utilizes the mixed solution of urea and sodium hydroxide to activate lignin sulfonate, improves the content of phenolic hydroxyl in lignin sulfonate;N-vinyl caprolactam is modified, and mercapto radical effectively attacks the olefin bond of N-vinyl caprolactam;Using Williamson ether reaction, the halogen in modified poly N-vinyl caprolactam is combined with the phenolic hydroxyl in activated lignin sulfonate to form ether.

This invention discloses a functionalized graphene quantum dot fluorescent ink composition and its preparation method, belonging to the technical field of anti-counterfeiting printing functional materials. The ink composition, based on a total weight of 100 parts, comprises 0.8-2.5 parts of graphene quantum dots co-modified with phosphonic acid and poly(N-vinylcaprolactam), 25-40 parts of an aqueous polyurethane dispersion, 0.5-1.5 parts of benzo-15-crown-5-carboxylic acid, 0.3-0.8 parts of a dispersant, 0.2-0.6 parts of a leveling agent, 0.1-0.3 parts of a defoamer, and the balance being deionized water. The quantum dots are prepared by a one-step hydrothermal method using citric acid, N-vinylcaprolactam, and vinylphosphonic acid as core raw materials in the presence of an initiator and a crosslinking agent. The ink of this invention simultaneously possesses photoluminescence, temperature response, and Fe... 3+ It features a triple anti-counterfeiting function with specific identification, and there is a synergistic enhancement effect between temperature sensitivity and ion response. At the same time, the ink has excellent storage stability and printability, making it suitable for high-end anti-counterfeiting fields.

Solid dispersion comprising 20-40 wt % of etrumadenant and 60-80 wt % of a polymer selected from HPMCAS, PVP-PA, CAP, HPMC E3, HPMCP, PVP and polyvinyl caprolactam-polyvinyl acetate-PEG graft copolymer. A process for preparing said composition by spray drying. Said composition for use in the treatment of cancer.

The invention belongs to the technical field of synthesis of organic compounds, and particularly relates to a method for purifying a crude chloroacetic acid product. The method comprises the following steps: S1, impregnating activated carbon with chloropalladic acid to prepare a catalyst precursor; the preparation method comprises the following steps: blending a catalyst precursor, a dispersing agent, a reducing agent, poly (N-vinyl caprolactam) and (S, S)-(+)-N, N '-bis (3, 5-di-tert-butyl salicylidene)-1, 2-cyclohexanediamine, carrying out a reduction reaction to prepare a palladium-carbon catalyst, and passivating to prepare a passivated palladium-carbon catalyst; s2, the heated crude chloroacetic acid product and hydrogen are introduced into a micro-interface generator to be mixed, then hydrogenation reaction is carried out under the action of a passivated palladium-carbon catalyst, gas-liquid separation and rectification are carried out after the reaction is completed, and the chloroacetic acid product is prepared. By improving the problems of insufficient selectivity and conversion rate of dichloroacetic acid impurities in the chloroacetic acid crude product purified by the existing palladium-carbon catalyst, the content of the dichloroacetic acid impurities in the chloroacetic acid crude product after catalytic hydrogenation is effectively reduced.

The invention relates to a sodium acetate-containing hydrate inhibitor for guaranteeing the flow of a carbon dioxide conveying pipeline, which comprises the following components in percentage by mass: 50-60wt% of sodium acetate, 25-30wt% of methanol, 0.01-1wt% of poly (N-vinyl caprolactam), 0.01-1wt% of polyoxyethylene sorbitan monooleate and the balance of a sodium chloride solution serving as a solvent after mixing the sodium acetate, the methanol, the poly (N-vinyl caprolactam), the polyoxyethylene sorbitan monooleate and the sodium chloride solution serving as the solvent. And 0.01 to 0.1 wt% of polyoxyethylene sorbitan monooleate. The sodium acetate, the methanol, the poly (N-vinyl caprolactam) and the polyoxyethylene sorbitan monooleate are compounded for use, so that the effect of a single inhibitor is enhanced, the application range is wider, a better inhibition effect is achieved while the use concentration of the methanol is reduced, and the generation of the carbon dioxide hydrate can be better inhibited. The mixed use reduces the cost of the inhibitor, reduces the use amount of the mixture, and weakens the toxicity and pollution of the inhibitor.

The invention relates to a bionic responsive polymer nanogel material as well as a preparation method and application thereof, the described nanomaterial takes poly (N-vinylcaprolactam) nanogel as a carrier, the surface of the nanogel is modified with indocyanine green, the interior of the nanogel is loaded with a drug, and finally the nanogel is coated with an exosome or a cell membrane extracted from cancer cells. The bionic responsive nanogel disclosed by the invention has a homologous targeting function, can improve the cancer cell uptake efficiency, can release drugs in a tumor microenvironment in a responsive manner, effectively reduces the non-specific toxic and side effects of the drugs, remarkably inhibits tumor growth through the combined action of mild photothermal therapy and chemotherapy, and has a good application prospect. After the nanogel is injected into the body of a mouse through tail vein, the ICG can realize thermal imaging and fluorescence imaging in the body by virtue of the excellent photo-thermal characteristic and fluorescence characteristic of the nanogel. Therefore, the method has potential clinical application value.

The invention relates to the technical field of pharmaceutical preparations, and particularly discloses an ophthalmic sustained-release gel preparation containing a block copolymer and a preparation method of the ophthalmic sustained-release gel preparation. The preparation comprises a polyethylene glycol copolyvinyl caprolactam-vinyl acetate block copolymer, an active drug, a polycaprolactone-polyethylene glycol-polycaprolactone triblock copolymer, a mucous membrane penetration enhancer, an antioxidant, an osmotic pressure regulator, a pH regulator, a preservative and water for injection. The preparation method comprises the following steps: firstly pretreating the matrix, then treating the medicine and refining, then mixing the medicine and the matrix in stages, sequentially adding the auxiliary materials and dissolving, regulating the system to a proper state, standing and curing, and finally filtering, carrying out gradient cooling and carrying out sterile filling. The preparation can be used for treating eye diseases such as glaucoma and intraocular hypertension, and has the advantages of continuously and stably releasing medicines, prolonging the retention time of eyes and improving the medication compliance of patients; the preparation method is controllable in operation and easy to reproduce, can stably guarantee the quality of the preparation, and is suitable for industrial production.

The application relates to a sodium acetate hydrate inhibitor containing sodium acetate for carbon dioxide conveying pipeline flow guarantee, which comprises sodium acetate, methanol, poly (N-vinyl caprolactam), polyoxyethylene sorbitol monooleate, and the mass percentage concentration of the four after being mixed with a sodium chloride solution as a solvent is as follows: sodium acetate 50-60 wt%, methanol 25-30 wt%, poly (N-vinyl caprolactam) 0.01-1 wt%, and polyoxyethylene sorbitol monooleate 0.01-0.1 wt%. In the application, the composite use of sodium acetate, methanol, poly (N-vinyl caprolactam) and polyoxyethylene sorbitol monooleate enhances the effect of a single inhibitor, the use range is more extensive, a better inhibiting effect is achieved while the methanol use concentration is reduced, carbon dioxide hydrate generation can be better inhibited, the inhibitor cost is reduced by mixed use, the amount of the mixture is reduced, and the toxicity and pollution of the inhibitor are weakened.

The present invention discloses a composition of serum-free medium and a culture method suitable for culturing hematopoietic stem cells.SOLUTION: In accordance with the present invention, there is provided a method of culturing hematopoietic stem cells, the method comprising contacting hematopoietic stem cells with a polyalkylene glycol modified by a copolymer of polyvinyl caprolactam and polyvinyl acetate blocks.SELECTED DRAWING: None