12 results about "Polyvinylpyrrolidone" patented technology

The invention discloses a temperature-sensitive wall material. The temperature-sensitive wall material comprises a temperature-sensitive material modified polymer wall material, wherein the temperature-sensitive material is polyvinylpyrrolidone, glycerophosphate, stearic acid, galactose-removed xyloglucan or gelatin-chitosan, poly(N-isopropylacrylamide) and hydroxybutyl chitosan. The temperature-sensitive wall material releases drugs at different temperatures, the drug release time is flexibly controlled, the phytotoxicity is reduced, and the drug action time is prolonged. The temperature-sensitive wall material can be applied to whole-course pesticide application protection of the growth cycle of crops, the chemical application frequency is reduced, and the crop management efficiency is improved. The invention also provides a corresponding microcapsule and a preparation method.

The invention discloses a flexible resistive random access memory and a preparation method thereof. The flexible resistive random access memory comprises a flexible top electrode, a flexible bottom electrode and an active layer positioned between the flexible top electrode and the flexible bottom electrode; and the active layer is prepared from molybdenum disulfide quantum dots and polyvinylpyrrolidone. The problems of relatively poor mechanical performance and insufficient stability of the resistive random access memory in the prior art are solved.

The invention discloses a camellia oleifera abel shell compound corrosion inhibitor and a preparation method and application thereof. The camellia oleifera abel shell compound corrosion inhibitor comprises 0.1-1.0 g/L of camellia oleifera abel shell extract, 0.05-0.5 g/L of aromatic aldehyde compound, 0.1-0.5 g/L of anionic surfactant, 0.01-0.1 g/L of polyvinylpyrrolidone and the balance picklingsolution. The preparation method comprises the following steps: mixing and uniformly stirring raw materials with the formula ratio to obtain the target camellia oleifera abel shell compound corrosioninhibitor. The camellia oleifera abel shell compound corrosion inhibitor is applied in acid pickling of iron and steel materials.

The invention belongs to the technical field of lithium battery materials, and particularly relates to a continuous preparation method of an ultrathin ceramic chip solid composite electrolyte of a lithium battery. The method comprises the following steps: adding polyvinylpyrrolidone into absolute ethyl alcohol at room temperature, stirring for 10-15 minutes, sequentially adding a lithium source, alanthanum source and a zirconium source, mechanically stirring for 120 minutes or more, adding a defoaming agent, and defoaming in vacuum for 20-50 minutes to obtain precursor slurry; scraping the slurry on a porous polymer film to form a film, then heating the polymer film to 130-160 DEG C, biaxially stretching the film, placing the stretched film on a conveyor belt, and continuously passing through a drying oven to form a solid ceramic green belt; cutting the solid ceramic green tape into ceramic blank sheets, placing the ceramic blank sheets in a sintering furnace, raising the temperatureto 450-600 DEG C at the rate of 2-3 DEG C/min for heating and heat preservation for 1-2 hours, then raising the temperature to 700-850 DEG C at the rate of 5-10 DEG C/min for sintering and heat preservation for 2-4 hours, and taking out the ceramic blank sheets after furnace cooling.

The invention discloses a medical cotton swab capable of adhering to the wound surface to promote healing. The medical cotton swab comprises a cotton stick and composite fiber cotton wrapping the end of the cotton stick. According to the cotton swab, traditional absorbent cotton is replaced with renewable and degradable composite polylactic acid fiber cotton to reduce the production cost and overcome the inherent defects of the absorbent cotton without generating adverse effects on the wound surface. The surface of the cotton swab is grafted with a polydopamine-polyvinylpyrrolidone/multiwalled carbon nanotube film in an adhering mode to form the composite fiber cotton with certain adhesion, which can adhere to the wound surface to enhance the effect of disinfection and sterilization and accelerate wound healing. The production process of the cotton swab is simple and efficient, materials in various links can be recycled, and no adverse effect is generated on the environment.

The invention discloses a flushing fluid for sterilizing and disinfecting medical instruments. The flushing fluid is prepared from main raw materials in parts by mass as follows: 36-44 parts of chlorhexidine gluconate, 8-12 parts of malvastrum coromandelianum, 4-8 parts of beautiful sweetgum fruits, 7-11 parts of bur beggarticks herbs, 9-15 parts of scabrous mosla herbs, 3-5 parts of smut fungi of rice, 6-10 parts of stems of Chinese wax gourds, 6-8 parts of purpleback murdannia, 32-40 parts of benzalkonium chloride and 5-8 parts of polyvinylpyrrolidone. The flushing fluid can quickly kill various viruses, bacteria, mycoplasmas, spores and other pathogenic microorganisms on the medical instruments, is non-toxic and pollution-free, does no harm to the human body, is environment-friendly and can sufficiently meet requirements for sterilization and disinfection of the medical instruments.

The invention discloses a preparation of silica-coated silver core composite particles. The preparation method comprises the following steps of mixing silver nitrate, ethanol and water, heating the mixed solution, adding polyvinylpyrrolidone into the mixed solution, then dropwisely adding a sodium hydroxide aqueous solution into the mixed solution for a reaction, after the reaction is finished, cooling to obtain a nano-silver particle-containing solution, adding ammonia water into the nano-silver particle-containing solution, then dropwisely adding tetraethoxysilane into the mixed solution for a reaction to obtain a composite particle-containing solution after the reaction is finished, filtering and washing the composite particle-containing solution to obtain composite particles, carrying out ultrasonic dispersion of the composite particles in water, heating the composite particles, adding polyvinylpyrrolidone into the composite particles for reactions of surfaces of the composite particles, cooling the reaction products, then dropwisely adding a sodium hydroxide aqueous solution into the reaction products for follow-up reactions, filtering, washing and drying to obtain the silica-coated silver core composite particles. The preparation method has simple processes, can be operated easily and has a high yield. The invention also discloses the silica-coated silver core composite particles. The silica-coated silver core composite particles have mesoporous structures having uniform sizes and shapes, have good controlled-release performances and antimicrobial activity and are especially suitable for preparation of antibacterial films.

The invention discloses a metal-ceramic composite fibrous membrane tube and a preparation method thereof. The preparation method is characterized by comprising the following steps: mixing 0.2 to 1 mass percent of polyvinylpyrrolidone, 0.7 to 10 mass percent of polyether sulfone, 7 to 50 mass percent of N-methyl-1-pyrrolidone, 50 to 90 mass percent of metal with a ceramic material in a mass ratio of 3-10:1, and performing ball milling to prepare slurry; pressurizing to make the slurry extruded from a interlayer clearance of a spinning nozzle and water and/or ethanol extruded from an inner pipesimultaneously, and making the slurry enter the water and/or the ethanol to obtain a hollow tubular blank of the metal-ceramic composite fibrous membrane tube; and sintering the blank at a temperature of between 800 and 1,500 DEG C at a reducing atmosphere or in a vacuum degree of between 1*10<-4> and 1*10<1>Pa to obtain the metal-ceramic composite fibrous membrane tube. The metal-ceramic composite fibrous membrane tube solves the problem that the traditional ceramic membrane tube is difficult to assemble, cannot adapt to high temperature and harsh conditions and is difficult to form and sinter, and heat exchange performance and gas/liquid transmission rate can be improved.