30results about How to "Improve high temperature insulation performance" patented technology

The invention relates to a vermiculite and nanometer silica composite nanometer multi-hole heat insulation plate and a manufacturing method thereof. The manufacturing method comprises the following steps: enabling primary mineral of the vermiculite to be heated and expanded in an expanding furnace to form expanded vermiculite; obtaining 30%-60% expanded vermiculite to be mixed with 40%-70% nanometer silica in a nanometer cladding machine; enabling the expanded vermiculite to be peeled into micro nanometer vermiculite slices which are wrapped by the nanometer silica simultaneously in a mixing process, enabling the micro nanometer vermiculite slices to be not contacted with each other, and obtaining mixing raw materials; and enabling the mixing raw materials to be pressed into heat insulation panels in a forming device. An embodiment providing the vermiculite and nanometer silica composite nanometer multi-hole heat insulation plate and the manufacturing method manufacture a novel heat insulation panel by compositing the vermiculite and the nanometer silica, and improve high temperature heat insulation performance by using the reflection effect of the micro nanometer vermiculite slices on high temperature thermal radiation. Simultaneously, the directional distribution of the micro nanometer vermiculite slices improves the mechanical property of materials.

The invention discloses a high-temperature-insulation aerogel composite material which comprises a SiO2 aerogel and doping opacifiers, wherein 3-5 opacifier doping layers are distributed inwards layer by layer from the outer surface of the SiO2 aerogel; the opacifier used by the first doping layer, which is arranged inwards from the outermost surface of the SiO2 aerogel, is carbon black with the particle size of 2.7-2.9 mu m, and the mass percent of the carbon black in the first doping layer is 42-45%; the opacifier used by the other doping layers is silicon carbide with the particle size of 2.5-3.5 mu m, and the mass percent of the silicon carbide in each doping layer is 75-85%; and from the second doping layer, the particle size of the silicon carbide doped in the layers decreases layer by layer, and the mass percent of the silicon carbide in the current doping layer increases. The high-temperature-insulation aerogel composite material still has higher porosity and larger specific area at 1200 DEG C, and is still available at 1200 DEG C, thereby further enhancing the application temperature of the SiO2-doped aerogel composite material.

The invention relates to a high-temperature-resistant, heat-insulating and wave-transmitting function integrated composite material and a preparation method thereof, belonging to the technical field of inorganic materials. The prepared high-temperature-resistant, heat-insulating and wave-transmitting material has high temperature resistance, high strength, low thermal conductivity, and transparent The characteristics of good wave performance. The high-temperature-resistant, heat-insulating and wave-transmitting function integrated composite material composite material obtained in the present invention has a multi-layer structure in the thickness direction, the high-temperature layer is a fiber skeleton and ceramic particles, and the low-temperature layer is a fiber skeleton, ceramic particles and airgel, and each layer The thickness can be determined according to specific design requirements.

The invention provides a polymer modified and nano-carbon fiber doped SiO2 aerogel and a preparation method thereof. The preparation method comprises: subjecting a water glass solution to ion exchange to obtain a silicic acid solution; dissolving a surfactant and nano-carbon fiber in the silicic acid solution, and carrying out ultrasonic dispersion to obtain nano-carbon fiber / SiO2 composite sol; adjusting the pH value of the composite sol, conducting standing at room temperature to obtain nano-carbon fiber / SiO2 gel; aging the gel at room temperature, and then transferring the gel into an aqueous solution of an organic solvent to conduct soaking; dissolving the soaked gel in an organic solvent of a silane coupling agent to carry out reaction under a heating condition; immersing the gel into a polymer monomer solution, conducting pumping filtering by a vacuum pump, and then carrying out polymerization reaction; and then performing washing and drying, thus obtaining the polymer modified and nano-carbon fiber doped SiO2 aerogel. The technical scheme provided by the invention has the advantages of safe operation and simple process, and the prepared SiO2 aerogel has excellent mechanical and thermal performance.

The invention discloses a ceramic rubber with high insulation resistance and high temperature resistance for heating cables and a preparation method thereof. The main components of the ceramic rubber are as follows in parts by weight: 40-45 parts of silicon rubber, 20-25 parts of ceramic powder, and glass powder 15‑20 parts, 5‑10 parts of quartz powder, 8‑10 parts of mica powder, 5‑10 parts of fumed white carbon black, 0.5‑1 parts of coupling agent, 2‑5 parts of softener, 0.8 parts of double pentasulfurizing agent ‑1 serving. When preparing, put the above raw materials into a rubber mixer for mixing, control the mixing temperature to 50-60°C, and the mixing time is 15-20min; after mixing, filter through a rubber filter to obtain the required ceramic rubber; The filter screen of the glue filter is set to three layers, which are 20 mesh, 40 mesh and 60 mesh from the inside to the outside. The beneficial effects are: high insulation resistance and high temperature resistance, good moisture-proof insulation effect, and long service life; the heating cable made of the ceramic rubber as the insulating layer can use the temperature up to 600 ° C, good moisture-proof insulation effect, high safety performance, even The outer sheath is worn and soaked in water, and the cable will not be broken down.

The invention relates to a preparation method of an outer surface sealing layer of foamy carbon. The preparation method is characterized by comprising the following steps: carrying out uniform ball-mill mixing on SiO2, ZrO2 and TiO2 ceramic powder in a molar ratio of 1 to (0.1-0.5) to (0-0.5), preparing suspension liquid, and depositing mixed ceramic powder on the outer surface of foamy carbon through electrophoretic deposition, wherein the concentration of mixed ceramic powder in the suspension liquid is 2g / L -10g / L; uniformly mixing a sodium polyacrylate solution, absolute ethyl alcohol and silica sol in a mass ratio of 1 to (1-5) to (10-20) to obtain mixed glue liquid, uniformly smearing the outer surface of a foamy carbon material being subjected to the electrophoretic deposition with the mixed glue liquid, carrying out thermal treatment at 200-300 DEG C in a vacuum environment, and repeatedly carrying out the step (6) for 3-8 times, so as to obtain a uniform and compact sealing layer material on the outer surface of foamy carbon. The preparation method has the advantages that (2) the sealing layer mainly consists of oxides, so that the high-temperature oxidation resistance of a composite material is improved; (2) a vacuum state is formed in the composite material, so that the high-temperature heat-insulating property of the composite material is improved; (3) the preparation temperature is low, the process is simple and rapid, and the cycle is short.

The invention discloses a heat insulation material with a controllable structure and a preparation method thereof, belonging to the technical field of thermal protection. The anti-radiation preparation is prepared, the fiber prefabricated body is partially compounded, freeze-formed, compounded again, dried and airgel compounded to prepare Controllable structural insulation. The invention can realize the design and preparation of the optimal radiation-resistant structure, and the prepared controllable structure heat insulation material is an airgel composite material with a controllable density distribution anti-infrared radiation structure, which can realize double improvement of high-temperature heat insulation performance.

The invention discloses sealing glass powder for electric connectors. According to the sealing glass powder, silicon dioxide serves as a skeleton structure and serves as a network forming body of glass, and an extremely small amount of alkali metal element is used, so that the melting temperature is lowered, the coefficient of expansion is increased, and the influence on high-temperature insulating properties of the glass is relatively low; alkaline-earth metal oxides such as MgO, CaO, SrO and BaO are added, and network gaps are filled with cations, i.e., Mg<2+>, Ca<2+>, Sr<2+> and Ba<2+> of MgO, CaO, SrO and BaO and a mixed base effect and a depressing effect are generated, so that the movement of alkali metal ions is hindered, and thus the insulating properties of the glass is improved; due to relatively high content of BaO, the material properties of the glass can be improved, and the high-temperature insulating properties of the glass is greatly improved; due to the addition of Al2O3, an AlPO4 unit can be formed in the glass, and a straight chain is changed into a network structure, so that the structure of the glass is stabilized, and the chemical stability is improved; in addition, by adding oxides such as ZnO, TiO2, ZrO2 and V2O5, the improvement on the chemical stability and electrical insulating performance of the glass is facilitated.