5results about How to "Improves ablation resistance" patented technology

The application discloses a high-temperature curing ablation-resistant and heat-insulating two-component coating and a preparation process. The coating is composed of A component and B component. The A component comprises modified epoxy resin, liquid butyronitrile rubber, aluminum hydroxide powder, chromium trioxide, high-silica fiber powder, hollow glass microbead and toluene; the B component is a curing agent and a curing accelerator. In the preparation, the aluminum hydroxide powder, the chromium trioxide, the high-silica fiber powder and the hollow glass microbead are made into a filler dispersion liquid; then the epoxy resin and the liquid butyronitrile rubber are made into a resin-rubber mixture; then the filler dispersion liquid is slowly and uniformly added into the resin-rubber mixture under stirring, and the A component is obtained by soaking in a static magnetic field at room temperature and grinding; the curing agent and the curing accelerator are the B component. By optimizing the coating composition, the ablation resistance and the heat-insulating performance of the coating can be obviously improved by coating a single layer, the construction process is simplified, the coating thickness is reduced, and the high-temperature resistance of the coating is improved.

This invention belongs to the field of ablation-resistant thermal insulation composite material preparation technology, specifically relating to a polyacrylonitrile-based hollow carbon fiber for thermal protection materials and its preparation method. The invention first pre-oxidizes porous polyacrylonitrile precursor fibers to obtain porous pre-oxidized fibers. Then, phenolic resin is coated onto the surface of the pre-oxidized fibers through solution polymerization. After impregnation in an organosilicon source solution, rapid Joule heating at high temperature deposits both phenolic carbon microspheres with excellent ablation resistance and a silica coating on the fiber surface, forming a unique hollow carbon fiber structure with excellent thermal insulation properties. This solves the problem that polyacrylonitrile-based carbon fibers cannot simultaneously achieve both thermal insulation and ablation resistance. The thermal conductivity of the polyacrylonitrile-based hollow carbon fiber prepared by this method is about 17% lower than that of porous polyacrylonitrile carbon fibers prepared by traditional carbonization methods, making it applicable to the field of integrated ablation-resistant thermal protection materials.

This invention discloses a silicate colloid for high-solids-content, high-modulus composite fire-resistant glass and its preparation method, relating to the field of composite fire-resistant glass technology. Specifically, it describes a silicate colloid for high-solids-content, high-modulus composite fire-resistant glass and its preparation method. The colloid, by weight percentage, comprises a silicon source, water, glycerol / ethylene glycol / polyethylene glycol / polyglycerol, water-soluble organic acids and salts, water-soluble metal oxides or hydroxides, and alkali metal hydroxides, wherein the solids content is 60-75% and the modulus is 4.0-5.5. The preparation method includes: uniformly mixing the silicon source, water, additives, and functional additives, then adding alkali metal hydroxides, reacting at 50-90°C to obtain a prepolymer solution, followed by vacuum degassing. The viscosity is adjusted to the desired range by controlling the reaction conditions. This prepolymer solution is suitable for pouring or coating processes. After curing, the colloid forms a fire-resistant glass core layer. The resulting fire-resistant glass has advantages such as high light transmittance, ultra-thinness, dense foaming, low-temperature resistance, high weather resistance, and long lifespan.

The application discloses a kind of thermosetting polyaryletherketone, composite material and the preparation method and application of thermosetting polyaryletherketone, belong to special polymer material field.The amino-containing crosslinkable thermosetting polyaryletherketone is synthesized by nucleophilic polycondensation reaction in the application.The thermosetting polyaryletherketone in the application can be self-crosslinked to form thermosetting polyaryletherketone product without adding crosslinking agent such as diamine monomer, and the influence of uneven distribution of crosslinking agent on thermosetting polyaryletherketone product is completely avoided.

The present application relates to the technical field of gas detection, and provides an inert gas measuring device, which comprises a laser, a first beam splitter, a hollow cathode discharge cavity, two optical filters, two photodetectors and a data acquisition card; the laser is used for emitting laser; the first beam splitter is used for splitting the laser into two beams, one of which is emitted to one photodetector after passing through the hollow cathode discharge cavity and one optical filter, and the other of which is emitted to the other photodetector after passing through the other optical filter; the hollow cathode discharge cavity is filled with inert gas; the data acquisition card is connected with the two photodetectors and is used for collecting signals of the two photodetectors and outputting the metastable particle number density in the hollow cathode discharge cavity. The scheme can improve the plasma density generated by discharge and the metastable atom conversion efficiency, reduce the detection limit under the condition of ensuring the measurement accuracy, and accurately measure the inert gas content.