11 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.

The invention discloses a soft polyvinyl alcohol foam material with uniform pore size distribution as well as a preparation method and application thereof, and relates to the technical field of high polymer material preparation. Comprising the following raw materials in percentage by weight: 5-20% of polyvinyl alcohol, 5-17% of inorganic acid, 5-17% of formaldehyde, 0.2-2% of a foaming agent, 0.2-2% of a stabilizer, 3-14% of a plasticizer and the balance of distilled water. The polyvinyl alcohol foam material provided by the invention is stable in preparation process, easy to realize industrial production, low in cost, stable and simple in process. The prepared foam material is stable in foam structure, good in biocompatibility, uniform in pore size distribution and long in service life, has popularization and application potential and is wide in market prospect. The invention solves the problem of poor performance of polyvinyl alcohol foam in the prior art.

The invention relates to a preparation method of a water-soluble fertilizer, in particular to a preparation method of a humic acid-containing water-soluble fertilizer. Aiming at the water-soluble fertilizer containing the humic acid, a strategy of firstly wrapping a layer of chitosan is innovatively adopted, and active groups such as carboxyl on the surface of the humic acid are effectively prevented from directly reacting with hydroxyl of polyvinyl alcohol, so that the stability of a foaming film is remarkably improved. Chitosan is used as a common additive of the water-soluble fertilizer, not only has good water solubility and biocompatibility, but also can be used as an isolating layer to prevent humic acid from damaging a polyvinyl alcohol foaming film structure, and the moisture-proof and anti-caking effects of the water-soluble fertilizer in the storage and transportation processes are ensured.

The invention discloses a hot-water-soluble degradable sanitary napkin, which relates to the field of disposable hygienic products and comprises a fiber surface layer made of hot-water-soluble fibers insoluble in cold water; the sponge absorption core body is made of a hot-water-soluble polyvinyl alcohol foam material and is formed by overlapping at least one polyvinyl alcohol sheet foam material; the impermeable film layer is a hot water-soluble polyvinyl alcohol film, and the side, close to the stripping film layer, of the impermeable film layer can be coated with gum; a stripping film of the stripping film layer is a water-soluble polyvinyl alcohol film. According to the invention, each part takes water-soluble polyvinyl alcohol as a main material, each component can be dissolved in hot water at a certain temperature, and under the action of a specific clastic enzyme, polyvinyl alcohol with a medium polymerization degree can be completely degraded in only one week. The degradation period of the polyvinyl alcohol subjected to composting treatment is within 3 months; the degradation period in soil under natural conditions is about 15 months, the degradation period in natural water is about 24 months, and complete degradation of the sanitary napkin can be achieved.

The invention discloses a polyvinyl alcohol foam material and a preparation method thereof, and belongs to the technical field of foam materials, the polyvinyl alcohol foam material comprises the following raw materials: polyvinyl alcohol, a plasticizer, a micro-crosslinking agent and a foaming agent; the boiling point of the plasticizer is greater than 250 DEG C; the foaming agent is an amide compound with the boiling point of 140-250 DEG C and / or an alcohol compound with the boiling point of 140-250 DEG C. The low-boiling-point small-molecular plasticizer is selected as the foaming agent, so that the foaming effect is achieved, and the effect of the plasticizer is also achieved; the foaming agent is captured and recycled after volatilization, the whole preparation process is safe, non-toxic and environment-friendly, the national environmental protection standard is met, in addition, the foaming agent can be used in cooperation with a high-boiling-point plasticizer, and the purposes of synergistically plasticizing PVA, destroying the hydrogen-bond interaction, improving the melt processability and enhancing the mechanical property are achieved.

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 application provides a novel ecological restoration water gel type environment-friendly dust suppressant, which comprises, in parts by weight, 0.7-1.3 parts of artemisia sphaerocephala krasch gum, 14.2-16.1 parts of polyvinyl alcohol foam plastic, 77-79.8 parts of pure acrylic emulsion and 2.8-2.9 parts of a surface active agent. The environment-friendly dust suppressant has excellent moisture absorption, moisture retention and dust suppression performance, can promote seed germination in soil, maintain seed vitality, promote plant seedling growth and improve the environment.

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.

The invention discloses a preparation method of porous composite gel. The preparation method comprises the following steps: (1) dipping polyvinyl alcohol foam gel in a solution containing [2-(methylacryloyloxy) ethyl] dimethyl-(3-sulfopropyl) ammonium hydroxide, an initiator and a cross-linking agent for a certain time; (2) carrying out heating polymerization reaction on the polyvinyl alcohol foam gel treated in the step (1) for a certain time to obtain PVA / PDMAPS; and (3) dipping the PVA / PDMAPS in a lithium chloride solution for a certain time to obtain the porous composite gel. Compared with an existing water collecting material, the porous composite gel has better moisture absorption performance, and particularly, the moisture absorption capacity of the porous composite gel reaches 2.9 g.g <-1 > or above under the relative humidity of 90%.

A method for manufacturing a cylindrical brush for a cleaning tool includes a cylindrical brush having a core member, a plurality of rail plates, a plurality of polyvinyl alcohol (PVA) blob foam bars, and a pair of end caps. The core member includes an outer wall having a plurality of core holes and a pair of openings. A plurality of rail plates having a plurality of rail holes are disposed along the outer wall of the core member. A plurality of polyvinyl alcohol (PVA) blob foam bars are installed on each of the plurality of rail plates such that each of the plurality of blobs of the PVA blob foam bars aligns with the plurality of core holes and the plurality of rail holes. A pair of end caps encloses the pair of openings in the core member.

The invention discloses a preparation method and application of an electromagnetic shielding polyvinyl alcohol foam gel composite material. The polyvinyl alcohol foam gel composite material comprises a hydrogel coating containing silver nanowires and MOF derivative magnetic carbon added into a polyvinyl alcohol foam matrix frame from inside to outside. The conductive nano filler, the hydrogel coating and the magnetic filler are introduced into the polyvinyl alcohol foam, and a plurality of interfaces are formed in the foam, so that the magnetic loss, the conductive loss and the multiple reflection loss of electromagnetic waves and the polarization loss of water can be realized; the electromagnetic shielding polyvinyl alcohol foam gel composite material prepared by the method can meet the requirements of low reflection, high absorption and high electromagnetic shielding effectiveness, also has certain mechanical strength, and can be used as a function-enhanced electromagnetic shielding material under a humid condition by utilizing the high sensitivity of the PVA gel coating to humidity, so that the electromagnetic shielding performance of the composite material is improved. Therefore, the PVA foam / gel composite material has dynamic adjustability of electromagnetic shielding.