6 results about "Polysol solution" patented technology

The invention discloses a high-swelling-rate solid gel electrolyte as well as a preparation method and application thereof, and belongs to the technical field of metal-air batteries. The method comprises the following steps: adding polyvinyl alcohol into deionized water to obtain polyvinyl alcohol sol; the preparation method comprises the following steps: adding KOH into deionized water to prepare an alkaline solution, and uniformly dispersing sodium polyacrylate into the alkaline solution to obtain a sodium polyacrylate alkaline solution containing high molecular weight; the preparation method comprises the following steps: uniformly mixing a sodium polyacrylate alkaline solution containing high molecular weight with polyvinyl alcohol sol, and preparing a sol solution when the mixture is in a faint yellow clear sol state; and freezing and standing the sol solution by adopting a thawing and freezing method to form a gel electrolyte, and soaking the gel electrolyte in an electrolyte aqueous solution to obtain the solid gel electrolyte. According to the invention, sodium polyacrylate is introduced into polyvinyl alcohol, and PAAS contains a large amount of carboxylate radicals and has the characteristics of high water absorption rate and high water absorption speed, so that the electrolyte containing capacity of the solid electrolyte is improved.

Disclosed in the present invention is a preparation method for a hydrosol solution. The preparation method comprises the following steps: classifying, according to material characters, all materials required for hydrosol solution preparation, and, according to the material characters, separately allocating the classified materials into feeding stations of a hydrosol solution preparation system for later use; turning on a heating system of the hydrosol solution preparation system to pre-heat a processing pipeline of a mixing and shearing apparatus, such that the temperature in the processing pipeline meets a hydrosol solution processing requirement; calculating and configuring a flow velocity for the materials of each material character to enter the processing pipeline; and starting the mixing and shearing apparatus of the hydrosol solution preparation system, and synchronously opening each feeding station, each type of materials being conveyed into the processing pipeline according to the configured flow velocity, and a first screw in the processing pipeline mixing and shearing all the materials at the same time, so as to obtain a uniform hydrosol solution. The present invention can reduce the working intensity of operators, and involves a simple preparation process and achieves high continuity, reducing the time consumed by the whole process.

The invention relates to a heat-insulating flame-retardant inorganic hybrid aerogel water-based varnish and a preparation method thereof, and the heat-insulating flame-retardant inorganic hybrid aerogel water-based varnish comprises the following components by weight: 20-30 parts of water; 10 to 20 parts of a silane modified polyurethane hyperdispersant; 10 to 20 parts of a hybrid nano silicon dioxide-siloxane-benzenesulfonyl benzene sulfonate type aerogel; and 50-60 parts of a silane modified nano potassium silicate-silica sol solution. According to the water-based varnish provided by the invention, hybrid aerogel particles are stably dispersed in a system through a silane modified polyurethane hyperdispersant by virtue of a steric hindrance effect so as to prevent agglomeration, and hybrid nano silicon dioxide-siloxane-benzenesulfonyl benzene sulfonate aerogel is a core functional component for realizing heat insulation and flame retardance; a silane modified nano potassium silicate-silica sol solution is used as a film forming main body, and finally, all the components jointly construct a protective coating with heat insulation, flame retardance, moisture resistance and aging resistance, so that the long-term protection requirements of ancient buildings are met.

This invention discloses a method for preparing in-situ grafted and dispersed nano-silica, relating to the field of nanomaterial preparation technology, comprising the following steps: Step ①, mixing sodium-free silica sol solution, water, and polyol in a high-pressure reactor; Step ②, gradually raising the reactor temperature from room temperature to 150-180℃, initially introducing acid anhydride gas or liquid at a certain flow rate, and maintaining temperature, constant pressure, and rotation speed until the pH value reaches 4.0-5.0±0.5, obtaining a primary mixture of hydrated nano-silica; Step ③, pumping an organosilicon coupling agent into the high-pressure reactor using a high-pressure metering pump, maintaining temperature and pressure, stirring the reaction for 30-90 minutes, then cooling, depressurizing, purging with nitrogen, and separating the reaction liquid to obtain grafted and dispersed nano-silica. This application aims to achieve readily available and inexpensive raw materials, reduce the difficulty of preparing nano-silica; solve the problems of dispersibility and compatibility with organic matter in nano-silica; simplify the procedure and improve preparation efficiency.

The application discloses a method for improving ablation performance of phenolic aerogel by physical doping, and is suitable for preparation of ZrB2, ZrSi2, ZrO2, TiB2, B4C, SiC or SiO2 particle-reinforced phenolic aerogel. The preparation method provided by the application uses polyvinylpyrrolidone as a dispersant and a phase separation agent, improves dispersion stability of the filling particles in a sol solution, promotes phase separation and growth of a phenolic skeleton on the surface of the filling particles, solves the problem of poor compatibility between the filling particles and the phenolic aerogel, guarantees the integrity of the holes of the phenolic aerogel in a normal-pressure drying process, is simple in operation, is widely applicable, and can be applied to production and preparation of an aerospace vehicle ablation-type thermal protection material.

The present application relates to the technical field of energy conversion materials and devices, and aims to provide a preparation method of a humidity-sensitive polyvinyl alcohol / lithium chloride / MXene composite film.The method comprises the following steps: dispersing lithium chloride in a polyvinyl alcohol aqueous solution to obtain a uniform polyvinyl alcohol / lithium chloride suspension, adding MXene nanosheets, and then performing chemical crosslinking under ultrasonic dispersion conditions to obtain a homogeneous sol solution; then the sol solution is applied on a clean glass sheet in a spin coating manner, and after drying and forming, a film-shaped polyvinyl alcohol / lithium chloride / MXene composite material is attached to the glass sheet.The preparation process of the composite film is simple, the product is easy to obtain, and the process is environmentally friendly; a self-powered humidity sensing device prepared based on the film application has the characteristics of high sensitivity and fast response speed, high repeatability, and reliable cycle stability of the humidity response. The synergistic effect of lithium chloride and MXene makes the humidity change response sensitivity of the composite film higher, the signal stronger, and the linear change more regular.