15results about How to "Low temperature resistance" patented technology

The present invention discloses a surface-reinforced aerogel composite material and a preparation method thereof. The prepared aerogel has the characteristics of light weight, high temperature resistance, low thermal conductivity, high strength, simple structure, etc., can withstand high temperatures, resist high-speed airflow scouring and exert excellent thermal insulation performance, and can be used as a thermal protection material in the aerospace field and other related fields. It can solve the problem that the structural strength of aerogel composite materials in the prior art is usually 2 to 3 orders of magnitude different from that of corresponding dense materials, and they cannot withstand high-speed airflow scouring on the surface of the fuselage of high-speed aircraft, and therefore cannot be used as heat-proof materials.

The invention belongs to the technical field of material preparation, and particularly relates to a superstructure glassy carbon material and application thereof. The invention firstly provides a porous scaffold structure. The porous scaffold structure has a stable structure in which stress in all directions is uniformly distributed; the porous scaffold structure takes a unit cell of a three-period minimum curved surface as a minimum repetitive unit; the unit cell of the three-period minimal curved surface comprises a diamond or diamond-like structure; the porous scaffold structure is made of a high-molecular polymer. Further, the superstructure glass carbon material can be obtained by pyrolyzing the porous scaffold structure. By designing a porous structure with uniform stress and stable mechanics, the high-strength glassy carbon material with accurate and controllable shape and size is developed, and the high-strength glassy carbon material has good application prospects in multiple fields.

The invention provides a low-noise and low-vibration plunger pump fluid end which comprises a shell, an upper valve cover and a lower valve cover are sequentially arranged in the shell from top to bottom, a first bush is arranged on the surface of the upper valve cover, a second bush is arranged on the surface of the lower valve cover, a discharge valve seat is arranged in the shell and located below the upper valve cover, and a discharge valve is arranged in the shell and located below the lower valve cover. A fourth lining is arranged on the inner wall of the discharging valve seat, the suction valve seat is arranged in the shell and located below the lower valve cover, a fifth lining is arranged in the suction valve seat, and the bottom of the shell is connected with a supporting plate. According to the low-noise and low-vibration plunger pump fluid end, the multiple bushings are arranged in the device, the noise value can be effectively reduced when the whole device is used, meanwhile, the first bushing, the second bushing, the fourth bushing and the fifth bushing have the characteristics of abrasion resistance and high temperature resistance, the service life is longer, and the service life is prolonged. The spraying layer is arranged at the bottom of the supporting plate, so that the influence of the machining process on the vibration noise value is reduced, and the spraying layer has the damping effect.

This invention discloses a high-performance meta-aramid / mica composite insulating paper and its preparation method. The paper is formed by wet papermaking and hot pressing of a mixed slurry composed of meta-aramid chopped fibers, meta-aramid precipitated fibers, and mica flakes. The composite insulating paper has a thermal decomposition temperature ≥425℃, tensile strength ≥52N / mm, tear strength ≥2.2N / mm, and voltage breakdown strength ≥13.8kV / mm. The mass ratio of chopped fibers to precipitated fibers is (50~80):(50~20). The amount of mica flakes added is 5wt%~10wt% of the total mass of the two aramid fibers. The hot pressing adopts a segmented hot pressing process of "low-temperature pre-pressing - medium-temperature strengthening - high-temperature setting". By controlling the key parameters of the precipitated fibers and optimizing the ratio of chopped fibers to precipitated fibers and the proportion of mica flakes added, the paper is prepared through processes such as raw material pretreatment, graded mixing and dissociation, wet papermaking, and segmented hot pressing. Advantages: Through multi-parameter coordinated control and process optimization, the technical bottlenecks such as the mechanical and insulation properties of existing aramid composite insulating paper and insufficient thermal stability have been solved.

The invention relates to the field of refractory materials, in particular to a low-temperature wear-resistant castable prepared from waste high-voltage electric porcelain and a preparation method of the low-temperature wear-resistant castable. The low-temperature wear-resistant castable prepared from the waste high-voltage electric porcelain comprises the following raw material components in percentage by weight: 50-54% of waste high-voltage electric porcelain aggregate, 10-15% of quartz sand, 10-16% of a binding agent, 3-5% of activated aluminum oxide micro powder, 3-5% of silicon micro powder, 4-7% of brown fused alumina powder and 3-5% of quartz powder. According to the invention, the design concepts of a high-temperature refractory material and low-temperature ultra-high performance concrete (UHPC) are integrated, the closest packing principle is adopted, solid waste high-voltage electric porcelain waste is used as aggregate particles, a reinforced matrix is formed, and a combination system is optimized; the low-temperature wear-resistant environment-friendly castable which achieves good integrity and use effect by means of self-combination of materials in a low-temperature environment (less than or equal to 300 DEG C) is prepared.

The utility model relates to cable technical field, concretely is a kind of low-temperature-resistant bending-resistant cable for plateau drilling device, including outer sheath, the inner sheath is arranged in outer sheath, fiber+tin-plated copper wire braiding reinforcing layer is arranged between the inner sheath with the outer sheath, the inner sheath is arranged in cable core, the cable core includes multiple control line core, each control line core includes conductor that is paired twisted distribution and is coated with insulating layer outside, and the screen shielding layer that is coated in paired conductor outside.The utility model provides a kind of low-temperature-resistant bending-resistant cable for plateau drilling device, is arranged by the outer sheath, insulating layer, paired twisted wire core, fiber+tin-plated copper wire braiding reinforcing layer, so that the cable has oil resistance, high strength, low-temperature resistance and good flexibility simultaneously, greatly increase the bending resistance of the cable.

The invention discloses high-temperature-resistant fluorine-modified silicone grease and a preparation method thereof, and relates to the field of organic silicon resin materials, and the high-temperature-resistant fluorine-modified silicone grease comprises the following raw materials in parts by weight: 80-90 parts of fluorine-modified organic silicon resin, 10-20 parts of epoxy resin, 3-5 parts of nanoparticles and 1-3 parts of a curing agent. The high-temperature-resistant fluorine-modified silicone grease is prepared by mixing fluorine-modified organic silicon resin, epoxy resin and nanoparticles and then adding a curing agent for curing. The fluorine-modified organic silicon resin prepared by the preparation method disclosed by the invention is matched with other raw materials with specific dosages, so that the prepared fluorine-modified silicone grease can be endowed with relatively strong high-temperature resistance and mechanical property, and the fluorine-modified silicone grease can meet more stringent service and bearing requirements.

The application discloses a glass fiber cotton felt, and relates to the technical field of thermal and sound insulation materials. The glass fiber cotton felt is obtained by spraying an adhesive on glass fibers, curing and drying. A modified phenolic resin solution is obtained by the following steps: adding 200-300 parts by weight of formaldehyde to 100 parts by weight of a mixed solution composed of phenol, dimethyl phenol and lignin, and reacting at a temperature of 40-60 DEG C to obtain a first solution, wherein the weight ratio of the phenol, dimethyl phenol and lignin is 10:2-4:1-8. An organic silicon modified methyl methacrylate prepolymer solution is obtained by the following steps: adding 100-200 parts by weight of methyl methacrylate to 100 parts by weight of a mixed solution composed of a silicon source and an organic solvent, uniformly stirring, and then adding deionized water and an initiator. The glass fiber cotton felt of the application has excellent hydrophobic performance, and the hydrophobic rate of the glass fiber cotton felt reaches 99% while the resilience of the glass fiber cotton felt is maintained.

The invention provides a covalent organic framework membrane for waste acid recovery and power generation as well as a preparation method and application thereof, and relates to the technical field of wastewater separation and recovery. The covalent organic framework membrane is prepared from a PaTp-TMC membrane formed on the surface of a base material by using p-phenylenediamine, trialdehyde phloroglucinol and trimesoyl chloride, the covalent organic framework membrane is high in selectivity, ultrafast transmission of H < + > and efficient interception of other ions can be realized, two processes of waste acid recovery and power generation (osmotic energy conversion) can be completed at the same time, and the covalent organic framework membrane has good application prospects. And the efficiency of process application is greatly improved.

The utility model discloses a transparent visible dust cover which comprises a frame body and a cover, and the cover is installed on the frame body in a buckling position matching mode. A gasket is arranged on the inner side of the frame body and is used for carrying out auxiliary assembly on the cover; the frame body is provided with an observation window. The cover is simple and reasonable in structure and easy to assemble and disassemble, even if the cover is damaged, the cover can be independently replaced, the whole cover does not need to be replaced, gaskets made of EVA materials are arranged between the cover and the frame body and at the bottom of the frame body, and the cover has certain elasticity and has the advantages of being resistant to acid and alkali, low temperature, ozone and mildew and the like. When the cover is arranged in the frame body and the frame body is arranged on the surface of an object, the cover can be better attached to the object, due to the elasticity, the possibility that gaps exist can be reduced to a certain extent, and external gas or liquid is prevented from permeating into the interior needing to be protected. And the use requirements in more scenes can be met.

The present invention belongs to the technical field of refractory materials, and relates to a high calcium magnesium calcium titanium zirconium brick for stainless steel smelting and a preparation method thereof. The present invention aims to replace the existing magnesium calcium brick for stainless steel smelting by preparing high calcium magnesium calcium zirconium sand, magnesium calcium titanium sand, and composite binder for oil shaft kiln. The high calcium magnesium calcium titanium zirconium brick has the characteristics of high bulk density, low pores and low impurities, and better high temperature resistance, corrosion resistance, slag resistance and high temperature wear resistance, and finally meets the purpose of replacing the traditional magnesium calcium brick refractory material for stainless steel smelting.

The utility model discloses a heat treatment furnace with a protective structure, which comprises a furnace body support, the furnace body support is connected with a furnace body, a heat insulation layer is coated outside the furnace body, an annular heating wire mesh is arranged in the furnace body, a cavity is arranged on the upper side of the furnace body, a reinforcing frame is fixed on the upper side of the cavity, and the protective structure is arranged on the reinforcing frame. A support is fixed to the upper side of the reinforcing frame, a first motor is fixed to the support, and an output shaft of the first motor is fixedly connected with a rotating shaft. The utility model relates to the technical field of heat treatment furnace equipment, in particular to a heat treatment furnace with a protective structure, which adopts a ceramic fiber blanket as a heat insulation layer to wrap a furnace body, and compared with the traditional heat insulation material, the ceramic fiber blanket has the characteristics of low heat conductivity, high temperature resistance and the like, and can effectively prevent heat in the furnace from being dissipated outwards and reduce energy consumption; by arranging the rotating assembly driven by the second motor and the lifting assembly composed of the hydraulic cylinder, the opening of the furnace body can be easily sealed and opened by the cavity.

The application discloses a kind of thermal insulation cotton felt, the thermal insulation cotton felt is formed by the glass fiber that is sprayed with adhesive solidification and drying;Adhesive is composed of the following components by weight parts: modified phenolic resin solution, methyl methacrylate prepolymers liquid modified by silicone, water, pentaerythritol, methyl emulsified silicone oil, dioctyl phthalate;Modified phenolic resin solution is obtained by the following steps: in the mixed solution consisting of phenol, dimethyl phenol, lignin, add formaldehyde, and obtain first solution under the condition of temperature 40~60 ℃ reaction;5~15 weight parts of sodium hydroxide solution is added in first solution to adjust the pH value of first solution to 8~9, and after heating, temperature is reduced to 35~50 ℃, add sulfuric acid and stir to obtain second solution;20~40 portions of hexamethylol melamine are added in second solution in batches.The thermal insulation cotton felt of the application improves the hydrophobic property of thermal insulation and sound insulation module while maintaining the resilience of glass fiber cotton felt.

The invention provides a self-heating shaft furnace and a method for preparing phosphoric acid by using the self-heating shaft furnace through a kiln method.The shaft furnace comprises a furnace body and a phosphorus gas pipeline, the furnace body comprises an overflow chamber, a combustion chamber and a reduction chamber, and the method for preparing the phosphoric acid comprises the steps that green pellets with the P2O5 content larger than or equal to 5% and an external reducing agent are mixed and then continuously added into the reduction chamber; during operation from top to bottom, indirect heat exchange is carried out between the flue gas and high-temperature flue gas reversely flowing from bottom to top outside the partition wall, and phosphorus-containing coal gas and residual tailings are formed after carbon thermal reduction reaction; the phosphorus-containing coal gas returns to the combustion chamber for combustion to provide heat for the reaction process; the discharged P2O5-containing flue gas is subjected to heat recovery, washing and condensation to generate phosphoric acid and tail gas; and residual tailings are discharged out of the reduction chamber after being cooled, and the residual reducing agent is recycled. The method not only realizes complete isolation of the reduction zone and the oxidation zone, solves the problem of direct utilization of medium-low-grade phosphorite, but also effectively recycles the heat energy of the phosphorus-containing coal gas, the prepared phosphoric acid is good in quality, and compared with an electric furnace phosphoric acid process, the external heat supply energy consumption can be reduced by 20-50%.

The invention discloses a cool and refreshing antibacterial biological shoe foaming material and a preparation method thereof. The cool and refreshing antibacterial biological shoe foaming material is prepared from the following components in parts by weight: 60 to 75 parts of EVA (Ethylene Vinyl Acetate), 5 to 10 parts of Surlyn, 3 to 5 parts of EEA-g-MAH (Ethylene Ethylene Acetate-g-MAH), 8 to 12 parts of activated wormwood, 3 to 4.5 parts of foaming agent, 0.2 to 0.5 part of auxiliary foaming agent, 5 to 8 parts of nucleating agent, 0.5 to 0.8 part of antibacterial agent and 0.5 to 0.6 part of surface modifier. The wormwood powder is modified, the composite foaming material with the advantages of high elasticity, low temperature resistance, deodorization, antibiosis and the like is prepared in the shoe material by utilizing the unique characteristics of the wormwood powder, compared with traditional EVA foaming, the density is close, the tensile strength and the elongation at break are higher, other properties are close to or slightly higher, and then the requirement for the foaming performance of the shoe material can be met.