3 results about "Polyvinyl alcohol foam" patented technology

The application provides a radiation sterilization method of a disposable polyvinyl alcohol foam wound care material. It relates to the field of medical devices. The method comprises the following steps: placing the disposable polyvinyl alcohol foam wound care material in a sterilization chamber to obtain the sterilized disposable polyvinyl alcohol foam wound care material; packaging the sterilized disposable polyvinyl alcohol foam wound care material into a packaging box in a sterile environment; placing the packaging box into a cargo box, and placing the cargo box on a lifting tool, which is operated to a radiation area by an automatic transmission system; performing multiple cyclic radiations in the radiation area to obtain the re-sterilized disposable polyvinyl alcohol foam wound care material, and the radiation dose of the multiple radiations is required to be 25.0-40.0 kGy. The method can realize multiple sterilization of the disposable polyvinyl alcohol foam wound care material and improve the sterilization effect.

This invention discloses a composite photothermal evaporator based on hydrogenated molybdenum trioxide, its preparation method, and its application, relating to the fields of clean energy and water resource utilization technology. The preparation method includes: performing a hydrogenation-reduction reaction of molybdenum trioxide powder and low work function metal particles in hydrochloric acid solution to obtain hydrogenated molybdenum trioxide powder and a filtrate containing metal ions; dispersing the hydrogenated molybdenum trioxide powder in the filtrate to obtain a composite dispersion; partially immersing the loading end of a polyvinyl alcohol foam substrate in a chitosan solution for pre-loading; then immersing the pre-loaded region in the composite dispersion to allow the chitosan to undergo an in-situ chelation reaction with the metal ions in the filtrate, simultaneously immobilizing the hydrogenated molybdenum trioxide particles; finally, subjecting the loading region to localized hydrophobic treatment to obtain a composite photothermal evaporator comprising a hydrophobic photothermal layer and a hydrophilic water-transporting layer. The evaporator obtained by this invention can be used for solar-powered seawater desalination, high-salinity wastewater treatment, or clean water production.

The invention discloses an all-solid waste light foam concrete thermal insulation material, which is prepared from the following raw materials in parts by mass: 20 to 30 parts of magnesium slag, 30 to 40 parts of mineral powder, 10 to 20 parts of graphite tailings, 10 to 50 parts of modified glass pumice, 18 to 81 parts of ChNFs suspension, 0.025 to 0.03 part of efficient polycarboxylic acid water reducing agent, 40 to 55 parts of water, 0.2 to 0.36 part of animal protein foaming agent and 0.15 to 0.25 part of polyvinyl alcohol foam stabilizer. The preparation method comprises the following steps: 1, mixing and stirring dry powder; 2, preparing slurry; 3, coating the modified glass pumice with the ChNFs suspension liquid; 4, preparing foam slurry; and 5, molding and curing in a mold. The magnesium slag, the mineral powder and the graphite tailings are adopted to achieve resource absorption of solid waste, the ChNFs suspension is adopted to wrap the modified glass pumice to form functional coarse aggregate, CO2 is utilized for physical foaming, and the strength, durability and functionality of the thermal insulation material are improved.