7results about How to "Low temperature resistance" patented technology

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 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 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 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.