282 results about "Trichlorosilane" patented technology

The invention relates to a glass fiber reinforced PET composite material and a preparation method thereof, and belongs to the technical field of polymer composite materials. The composite material is prepared from the following raw materials in parts by weight: 100 parts of PET (Polyethylene Terephthalate) master batch, 32 to 45 parts of modified glass fiber, 0.19 to 0.24 part of nucleating agent, 1.6 to 2 parts of lubricating agent and 0.12 to 0.15 part of antioxidant, the modified glass fiber is prepared by grafting sulfydryl on the surface of glass fiber by KH-580 to prepare sulfhydrylated glass fiber, reacting tert-butyldimethylamine with 2-bromoethanol to form hydroxyl-terminated quaternary ammonium salt, substituting with octylene trichlorosilane to form a modifier, and adding alkenyl containing alkyl long chains introduced into the modifier molecule with the sulfydryl grafted on the surface to prepare the modified glass fiber. Introducing modifier molecules to the surfaces of the glass fibers; and the modified glass fiber improves the strength of the composite material and keeps high impact resistance.

The invention relates to a preparation method and application of a long-acting antibacterial hydrophobic fabric, and belongs to the technical field of functional fabric materials. Aiming at the problems of antibacterial agent loss, hydrophobic function decline and antibacterial and hydrophobic synergism failure after repeated washing of the fabric, the method comprises the following steps: pre-treating the fabric to remove impurities, and constructing a functional layer step by step: immersing polyester or cotton fabric into a 2-8wt% chitosan quaternary ammonium salt aqueous solution, and carrying out vacuum pressurization impregnation at 75-85 DEG C to form an antibacterial layer; mixing octadecyl trichlorosilane with deionized water to prepare a pre-hydrolyzed emulsion, diluting the pre-hydrolyzed emulsion, and spraying the diluted pre-hydrolyzed emulsion on the surface of the fabric in a graded gradient manner to construct a hydrophobic layer; and finally, curing at 60-80 DEG C to form a coating layer. The fabric prepared by the method has lasting antibacterial property, super-hydrophobicity and blood adhesion resistance, can be used for medical protective articles such as operating gowns and medical bed sheets needing high-frequency cleaning, and can effectively prevent cross infection.

The invention relates to a perovskite photovoltaic cell high-transmittance low-scattering coating material and a preparation method thereof, and belongs to the technical field of photovoltaic cells. The coating material is prepared from the following components in percentage by weight: 7.2 to 8.5 percent of PMMA (Polymethyl Methacrylate) resin, 0.17 to 0.22 percent of modified nano titanium dioxide, 0.09 to 0.11 percent of flatting agent, 0.03 to 0.04 percent of defoaming agent and the balance of solvent, the modified nano titanium dioxide is prepared into an intermediate through addition reaction of triallylamine and mercaptoethanol, and then a modifier with a network molecular structure is formed through substitution reaction of trifluoropropyl trichlorosilane and hydroxyl at the end part of an intermediate molecule; a thioether chain segment in a modifier molecule and similar nitrogen and oxygen elements form a strong chelation effect to coat the nano titanium dioxide; the introduction of the modified nano titanium dioxide makes up the problem of light transmission reduction caused by traditional titanium dioxide reinforcement.

The invention discloses a catalyst for preparing trichlorosilane and a catalytic preparation method of trichlorosilane. The catalyst is prepared from the following components in percentage by mass: weighed copper nitrate, zinc nitrate, aluminum nitrate, lanthanum nitrate and the balance of a carrier, the preparation method comprises the following specific steps: S1, filling a catalyst; S2, purifying raw material gas; S3, reacting; and S4, separating and purifying a product, namely discharging a reacted gas product from an outlet of a reactor, and condensing through a condenser. In the prepared catalyst, the activity and selectivity of the catalyst are remarkably improved through the synergistic effect of the copper-zinc-aluminum composite oxide and the rare earth element lanthanum, the electronic structure and the surface acid-base property of the catalyst can be adjusted through doping of lanthanum, the reaction of silicon powder and hydrogen chloride is promoted, meanwhile, side reactions are inhibited, and the service life of the catalyst is prolonged. And the yield of trichlorosilane is improved.

The invention belongs to the technical field of trichlorosilane purification, and discloses an adsorbent for adsorbing phosphorus impurities in trichlorosilane and a preparation method and application thereof.The preparation method comprises the steps that activated carbon is immersed in a solution containing ammonium metavanadate and oxalic acid, ultrasonic treatment and drying are conducted, and a vanadium oxide / carbon material mixture is obtained; calcining the vanadium oxide / carbon material mixture, and performing reduction treatment to obtain the oxygen vacancy-rich activated carbon loaded vanadium oxide adsorbent. The activated carbon loaded vanadium oxide adsorbent rich in oxygen vacancies is prepared by using a dipping-calcining-reducing method, and phosphorus impurities are adsorbed and removed by using the interaction of the activated carbon loaded vanadium oxide adsorbent and PCl3. The active carbon loaded vanadium oxide adsorbent rich in oxygen vacancies interacts with PCl3, so that trace PCl3 can be efficiently removed.

The invention discloses a main shaft lifting and rotating device for vapor deposition equipment and a using method, and relates to the technical field of vapor deposition equipment.The main shaft lifting and rotating device comprises a support, a chemical vapor deposition furnace is fixedly installed on the top face of the support, and a furnace door is installed on the front side wall of the chemical vapor deposition furnace through a connecting piece; the lifting and rotating mechanism is arranged in the furnace door, the lifting and rotating mechanism comprises a base, a mounting groove is formed in the top surface of the base, a servo motor is fixedly mounted in the mounting groove, and the top surface of the base is rotationally connected with a main shaft body. Real-time monitoring and accurate control of the concentration of mixed gas in the reaction chamber are achieved, an electrochemical sensor, a resistance-type semiconductor sensor and a heat-conducting gas sensor in the detection assembly can accurately measure the concentration of methyl trichlorosilane, the concentration of hydrogen and the concentration of argon respectively, and comprehensive monitoring of gas components in the reaction chamber is guaranteed.

The system comprises a gradient catalytic reaction rectifying tower and a temperature control system, the rectifying tower is sequentially provided with a rectifying section, a reaction section and a stripping section from top to bottom, the reaction section is filled with an ion exchange resin solid catalyst, and the stripping section is filled with an ion exchange resin solid catalyst. The radiuses of the catalyst bag units are distributed in a gradient mode from small to large along the height of the tower, the catalyst bag units have the functions of catalytic reaction and mass transfer separation, the rectifying section and the stripping section are filled with structured packing or high-separation-capacity metal wire mesh packing, a gas-liquid separator is arranged at an outlet of the stripping section, and a temperature control system achieves segmented monitoring through a multi-point temperature sensor. The surface of the catalyst can be subjected to functional treatment to improve the decomposition resistance; the method comprises the following steps: feeding trichlorosilane generated by cold hydrogenation into the upper part of a reaction section from a feed port, carrying out disproportionation reaction at the gradient temperature of 20-100 DEG C and the pressure of 0.3-0.6 MPa according to the reflux ratio of (15-30): 1 to generate silane, and carrying out rectification and extraction separation to obtain high-purity silane with the purity of 99.999% or above.

The invention provides an efficient trichlorosilane synthetic furnace and an intelligent temperature control method thereof. The efficient trichlorosilane synthetic furnace comprises a reactor body and an intelligent temperature control module, the reactor body comprises a shell; the shell comprises a conical area and a cylindrical area; the cylindrical area sequentially comprises a lower-section reaction area, a middle-section reaction area and an upper-section reaction area from bottom to top, and cooling devices are independently arranged on the outer sides of the reaction areas respectively; an internal part is arranged in the lower section reaction area; the intelligent temperature control module comprises a temperature sensor unit, an intelligent control unit and a flow adjusting unit. According to the invention, by arranging the internal part and the intelligent temperature control module, intelligent temperature control is realized, the temperature uniformity of each reaction area in the trichlorosilane synthetic furnace is effectively improved, and the conversion rate of trichlorosilane is greatly improved.

The invention relates to the technical field of trichlorosilane processing, in particular to equipment and method for removing boron and phosphorus impurities from trichlorosilane, the equipment comprises an adsorption column used for adsorbing trichlorosilane, the adsorption column is filled with an adsorbent, and the adsorbent is specially used for removing the boron and phosphorus impurities in trichlorosilane; the jacket is arranged on the outer wall of the adsorption column and is used for regulating and controlling the temperature in the adsorption column, a pipeline connected with the jacket is divided into an inlet part and an outlet part, and the inlet part and the outlet part are respectively provided with a regulating valve and a stop valve and are used for controlling a medium and flow which are introduced into the jacket. A multi-section adsorbent and a jacket temperature control system are adopted, so that boron and phosphorus impurities in trichlorosilane are efficiently removed. The design of the multi-section adsorbent allows different types of adsorbents to selectively adsorb specific impurities, so that the removal efficiency is improved. And each adsorbent can exert the optimal performance under different temperature and pressure conditions.

The invention relates to the technical field of chemical engineering, and discloses a trichlorosilane hydrogen reduction polycrystalline silicon growth monitoring system fusing multi-source data. Comprising a multi-sensor monitoring module, a multi-sensor data acquisition module, a multi-source data preprocessing module, a growth process data analysis module, a growth state online evaluation module, a process parameter online regulation and control module, a regulation and control result feedback module and a system collaborative management module, the multi-sensor monitoring module monitors the growth process of trichlorosilane hydrogen reduction polycrystalline silicon through multiple sensors, the multi-sensor data acquisition module acquires original data, the multi-source data preprocessing module preprocesses the data, the growth process data analysis module carries out data calculation, and the growth state online evaluation module carries out online comprehensive evaluation. The process parameter online regulation and control module regulates and controls process parameters online, the regulation and control result feedback module generates an adjustment strategy, and the system collaborative management module performs system parameter recording and storage, system optimization and exception handling.

The invention discloses an ICP-MS (Inductively Coupled Plasma Mass Spectrometry) detection method for phosphorus in trichlorosilane, and belongs to the field of analysis of high-purity electronic chemicals. According to the invention, a low-temperature matrix digestion technology is adopted to quantitatively form a SiFcomplex and inhibit silicon volatilization loss; according to the matrix matching calibration system, a calibration curve is constructed by adopting a weighted least square method, so that matrix interference is effectively corrected; a detection technology screening strategy is carried out by combining a cascade strategy of high-resolution inductively coupled plasma mass spectrometry, so that the interference of a complex matrix is successfully avoided. Experiments show that when the method is used for detecting phosphorus, the linear correlation coefficient R is greater than 0.999, the detection limit is as low as 0.02 ng / g, and the method accords with ISO 17025 and semiconductor-grade material quality control standards, and is suitable for accurate quantitative analysis of ng / g-grade phosphorus elements in high-purity trichlorosilane.

The utility model provides a system for synthesizing trichlorosilane. The system for synthesizing trichlorosilane comprises a trichlorosilane synthesis reaction device, a first gas-solid separation unit, a first tail gas treatment unit, a silicon tetrachloride hydrogenation reaction device, a second gas-solid separation unit, a second tail gas treatment unit and a product separation and purification unit. According to the system, through the technological process of fusing the trichlorosilane synthesis reaction and the silicon tetrachloride hydrogenation reaction, efficient utilization of silicon powder, hydrogen and silicon tetrachloride is achieved, the investment and operation cost is saved, and meanwhile the raw material consumption is reduced.

The invention discloses an antibacterial epoxy resin coating and a preparation method thereof, and relates to the technical field of coatings. According to the invention, the 5-phenylpent-2, 4-dienoic acid is esterified and combined with the side chain of the epoxy resin, so that the hardness and heat resistance of the cured coating are improved; then addition reaction with dimethyl diallyl ammonium chloride, 2-acrylamide phenylboronic acid and the modified antibacterial agent is performed to form a three-dimensional network structure, so that the mechanical strength of the coating is remarkably enhanced, the antibacterial, high-adhesion and anti-stripping effects are achieved, a phenylboronic acid structure is assisted, a protective film is formed on the surface of an object, the object is effectively isolated from the external environment, and the service life of the coating is prolonged. Oxidation and corrosion of the object surface are prevented, and the corrosion-resistant effect is achieved. According to the modified antibacterial agent, S-adenosine-L-homocysteine and silver nitrate are subjected to a coordination reaction, and the antibacterial effect is achieved; then, the silicon dioxide is combined with vinyl trichlorosilane, silane groups are introduced, after curing, the mechanical strength and water resistance of the coating are remarkably enhanced, corrosive liquid is prevented from entering the coating, and the corrosion-resistant effect is indirectly improved.

The invention discloses a low-expansion silicon-carbon negative electrode material and a preparation method thereof, and belongs to the technical field of secondary batteries. The invention relates to a preparation method of a low-expansion silicon-carbon negative electrode material. The preparation method comprises the following steps: S1, depositing SiO2: depositing porous carbon for the first time by adopting silane with at least two ethyoxyl groups or methoxyl groups; then calcining to obtain a SiO2 deposition layer; s2, silicon deposition: carrying out secondary deposition on the material obtained in the step S1 by adopting monosilane, disilane and / or trichlorosilane; and S3, carbon coating: carrying out carbon coating on the material obtained in the step S2 by using a carbon source gas. According to the low-expansion silicon-carbon negative electrode material disclosed by the invention, porous carbon is firstly subjected to deposition modification by utilizing SiO2 deposition, so that the overall structural strength of a framework is improved; after silane deposition, silicon of the second deposition layer and silicon dioxide of the first deposition layer can react to generate SiO, and volume expansion of silicon crystal grains can be relieved.

The invention provides a continuous synthesis system of gamma-chloropropyltrichlorosilane. The continuous synthesis system comprises a trichlorosilane storage tank, a chloropropene storage tank, a catalyst storage tank, a static mixer, an n-stage series tubular reaction system and a rectification device, the tubular reaction system comprises a tubular reactor, a back pressure valve, a degassing device and a condenser; a liquid phase outlet of the degassing device and a liquid phase outlet of the condenser are connected with a next-stage tubular reactor; the trichlorosilane storage tank, the chloropropene storage tank and the catalyst storage tank are respectively connected with an inlet of the static mixer, and an outlet of the static mixer is connected with the first-stage tubular reactor; the inlet feed of the second to nth stages of tubular reactors comprises chloropropene; a liquid phase outlet of the nth-stage degassing device is connected with an inlet of the rectification device, and the rectification device is connected back to the first-stage tubular reactor and outputs a gamma-chloropropyltrichlorosilane product. The reaction efficiency and the conversion rate are improved, and the production energy consumption and the cost are low. The invention further provides a synthesis method based on the system, and the technological process is simple.

The utility model relates to a trichlorosilane adsorption tower in the technical field of adsorption equipment, which comprises a tower body, an air inlet pipe and an emptying pipe are arranged at the bottom of the tower body, and an exhaust pipe is arranged at the top of the tower body; the interior of the tower body is divided into a spraying area and an adsorption area from bottom to top, a spraying pipe is arranged at the top of the spraying area, a spherical gas distribution plate is arranged at the bottom of the spraying area, gas distribution holes are fully distributed in the gas distribution plate, and the gas inlet pipe is located below the gas distribution plate; the adsorption area comprises a filler layer, the filler layer is an activated carbon layer, a heat exchange assembly is arranged in the filler layer, the heat exchange assembly comprises a coiled pipe, and the coiled pipe is connected with a medium inlet pipe and a medium outlet pipe. According to the utility model, trichlorosilane can be subjected to impurity removal and purification after spraying and adsorption in sequence, the efficiency is high, and the effect is good; the temperature of the filler area can be flexibly adjusted according to needs, the adsorption effect can be improved, the filler can be purified, and the next adsorption effect is not affected.

The utility model discloses an energy-saving rectification system for electronic-grade silane gas production. The energy-saving rectification system comprises a stripping tower condenser arranged on a stripping tower, and a trichlorosilane evaporator connected with a trichlorosilane tower, the trichlorosilane tower is respectively connected with a stripping tower reboiler arranged on the stripping tower and a dichlorosilane reboiler arranged on the dichlorosilane tower, the trichlorosilane tower is connected with a trichlorosilane return tank through a trichlorosilane air cooler, and the trichlorosilane return tank is respectively connected with the trichlorosilane tower and the dichlorosilane tower; the dichlorosilane tower is provided with a dichlorosilane air cooler, the dichlorosilane air cooler is connected with a dichlorosilane return tank, and the dichlorosilane return tank is respectively connected to the dichlorosilane tower and the second reactor feeding preheater; a discharge preheater of the first reactor is connected to a trichlorosilane tower, a discharge port of the second reactor is connected with a silane tower, and the silane tower is respectively connected with a dichlorosilane tower and a post-stripping tower. Therefore, efficient production of the electronic-grade silane gas is realized.

A method is disclosed comprising providing a carbonaceous substrate; performing a chemical vapor deposition process on the carbonaceous substrate using a mixture of precursor gasses comprising a silicon precursor gas comprising trichlorosilane, and a carbon precursor gas selected from carbon-carbon double bond hydrocarbons and carbon-carbon triple bond hydrocarbons; and via said chemical vapor deposition process, forming a polycrystalline cubic silicon carbide layer with crystallographic orientation.

The invention discloses a preparation method of a warm-keeping and health-care composite fabric, and relates to the technical field of functional fabrics. The preparation method comprises the following steps: firstly, combining fumed silica with graphene oxide hydrogel to prepare mixed aerogel; the mixed aerogel is combined with allyl trichlorosilane, and is grafted to a macromolecular chain of polypropylene through maleic anhydride, so that the compatibility is improved, and the agglomeration problem is solved; secondly, calcining tourmaline, then directly carrying out quenching hydration modification, combining Si-OH groups on the surface with active groups in a polyester molecular chain, and spinning into hollow fibers; the mixed aerogel can absorb far infrared rays dissipated and emitted by the modified tourmaline, and the aerogel absorbing the far infrared rays can generate a resonance effect and a warm effect and permeate into the deep layer of the skin; the modified tourmaline has the capability of generating negative ions, and the gull rock powder is added for combined action, so that the antibacterial effect is achieved by destroying the structure of bacteria, and the health-care effect is achieved. The composite fabric prepared by the invention has warm-keeping and health-care effects.

The invention discloses a slow-start pneumatic switch valve device for trichlorosilane feeding, and belongs to the technical field of material preparation process valves. Comprising a switch valve and a pneumatic actuator, linear motion of a piston rod is converted into rotation fine adjustment through a swing arm rotation compensation mechanism, a solid / microgroove sealing ring and a sliding cavity wall are always kept on a theoretical contact line, abrasion microgaps are automatically compensated, zero-clearance sliding in the whole life cycle is achieved, and manual clearance adjustment is avoided; the solid sealing ring adopts surface-surface contact, so that the unit pressure is reduced by more than 50%, and the wear rate is obviously reduced; the omega-shaped groove of the microgroove sealing ring converts solid particles (10-50 microns Si) into groove edge elastic sealing, and the wear rate is reduced by 40% again; a sealing surface is provided with a uniform oil film, the dynamic and static friction coefficient difference is reduced, crawling / jumping in a 0-20% opening low-speed stage is eliminated, true slow starting is achieved, the water hammer effect during trichlorosilane feeding is avoided, the sealing surface is provided with the uniform oil film, the dynamic and static friction coefficient difference is reduced, and crawling / jumping in the 0-20% opening low-speed stage is eliminated.

The invention provides a photovoltaic glass surface self-cleaning coating and a preparation method thereof.The photovoltaic glass surface self-cleaning coating is prepared from a dehydrated organic solvent, 1-7 parts by mass of tetramethyl orthosilicate, 2-15 parts by mass of fluorosilane hydrophobic coupling agent, 10-20 parts by mass of silicon tetrachloride, 1-10 parts by mass of hydrophobic silane coupling agent, 5-15 parts by mass of dichloro (methyl) (3, 3, 5-trimethyl-1, 3, 5-trimethyl-1, 3, 5-trimethyl-1, 3, 5-trimethyl-1, 3, 5-trimethyl-1, 3, 5-trimethyl-1, 3, 5-trimethyl-1, 3, 5-trimethyl-1, 3, 5-trimethyl-1, 3, 5- and 1-10 parts of 2, 3, 3-trifluoropropyl) silane and 1-10 parts of dimethyl dichlorosilane. According to the preparation method, tetramethyl silicate with relatively low reaction activity is used as a raw material to react with silicon tetrachloride to form an intermediate species with moderate activity, and then a linear chain polymer modification layer is pre-formed on the surface by utilizing the difference of reaction rates; a fluorosilane substance added in the coating also can participate in the reaction to form an organic silicon linear polymer with a fluorosilane side chain; in the recombination process of polysiloxane, perfluoro side chains with lower surface energy migrate to the surface of the coating; meanwhile, by adding the dichlorosilane coupling agent and the trichlorosilane coupling agent, the flexibility and hydrophobicity of the coating are improved.

The invention relates to the field of silane production, and discloses an energy-saving type silane production and purification system which comprises a production unit used for converting trichlorosilane into silane gas and a chlorosilane compound and carrying out preliminary separation treatment on the silane gas and the chlorosilane compound. According to the invention, a disproportionation reaction rectification method is adopted, after pressurization by a compressor, the temperature and pressure of silane gas and other chlorosilane compounds are increased, and the boiling point of the chlorosilane compounds is increased, so that the chlorosilane compounds are more easily liquefied at a higher temperature, more effective condensation and separation in a precooler are facilitated, and the yield of the chlorosilane compounds is improved. And through the cooling effect of the precooler, part of the chlorosilane compound is condensed into a liquid state, so that preliminary separation of the chlorosilane compound and gaseous silane gas is realized, part of impurities are removed in advance, the content of the impurities entering the silane separation tower is reduced, and the separation efficiency of the separation tower is improved.

The application discloses a kind of feed dynamic regulation methods of synthesizing trichlorosilane, through multispectral synergistic detection, through the accurate calculation of key parameters such as hydroxyl inhibition factor, amorphous phase activity gain and metal impurity inhibition factor, the activity condition of silicon powder in fluidized bed can be accurately and real-time reflected, the technical bottleneck that silicon powder activity cannot be monitored on line is broken through, and then in industrial production, for the proportion of fluidized bed feed etc. Real-time regulation provides control basis.Through feed dynamic regulation mechanism, silicon powder feed rate, H2 / SiCl4 ratio and catalyst addition amount can be optimized in real time, ensure that silicon powder is always in high activity state, promote the reaction to proceed, improve trichlorosilane yield and purity, solve the problem that traditional fixed regulation mode and silicon powder dynamic activity do not match, and then improve regulation accuracy.

The invention relates to a method and a system for preparing trichlorosilane from ferrosilicon, the method comprises the following steps: taking ferrosilicon, silicon tetrachloride and hydrogen as raw materials, fully reacting in a fluidized bed reactor to obtain trichlorosilane and FeSiy alloy, xlt; 40). The system comprises a fluidized bed reactor (200), a cyclone separator (300), a washing tower (400), a gas-liquid separator (500) and a coarse distillation tower (600). Compared with the prior art, the method has the remarkable characteristics that the silazite is used as a silicon source and is low in cost and easy to obtain, the reaction activity of trichlorosilane and FeSiy generated by reaction of the silazite, silicon tetrachloride and hydrogen is high, the utilization rate of silicon elements in the compound is high, no extra catalyst needs to be added in the co-hydrogenation reaction, meanwhile, the byproduct FeSiy alloy is produced, and the production cost is low.

The invention discloses a method for preparing methyltriacetoxysilane from acetic anhydride-containing acetyl chloride distillation tailings, and relates to the technical field of organic silicon synthesis, the method comprises the following steps: adding methyl trichlorosilane and acetic anhydride-containing acetyl chloride distillation tailings into a reaction kettle, stirring and heating; after a total reflux condition is reached, maintaining total reflux for a period of time, and then starting to collect acetyl chloride; continuously heating until the collection of acetyl chloride is completed, stopping heating, and when the temperature of the kettle is reduced to room temperature, heating again and starting vacuum negative pressure; when the kettle temperature reaches a set value, stopping heating, stopping stirring, and closing vacuum negative pressure; and after the kettle temperature is reduced to room temperature, adding pretreated activated carbon, carrying out decoloration reaction, and carrying out suction filtration after the reaction is completed, thereby obtaining the product. According to the method, a large amount of acetic anhydride in the acetyl chloride distillation tailings is used as a raw material and directly reacts with methyl trichlorosilane to prepare methyltriacetoxysilane, and the quality of the obtained product is remarkably higher than that of a product prepared by a normal process.

The invention discloses a preparation method of a regenerated polyester fiber, and relates to the technical field of polyester fibers. The present invention first utilizes (4-formylphenyl) phosphonic acid to combine with 2-(3-nitroaniline) acetohydrazide to form a Schiff base structure, achieves antibacterial effect, and simultaneously introduces phosphorus element to achieve flame retardant and anti-wear effect; then forms a modified wear-resistant agent of a cross-linked network structure with butanediol, significantly enhancing the wear-resistant effect of fiber; then utilizes 1,7-octadiene-3-ol and octene trichlorosilane copolymerization to make a modifier, form a cross-linked network structure, enhance wear-resistant effect, and simultaneously be able to suppress the burning of flame, achieve flame retardant effect; then attracts the modifier by hydroxylated carbon nanotubes to prepare modified carbon nanotubes in situ polymerization on its surface, improve carbon nanotube dispersibility, prevent fiber from falling off, and improve the wear resistance of material; finally, regenerated polyester fiber, modified wear-resistant agent, and composite modified carbon nanotube are mixed and melt-spun to achieve wear-resistant, antibacterial, flame-retardant effect.

The invention discloses a silicon carbide epitaxial wafer growth method for improving epitaxial pit defects, which comprises the following steps: firstly, introducing hydrogen into a reaction chamber, raising the temperature of the reaction chamber to a buffer layer growth temperature, and then introducing ethylene and trichlorosilane into the reaction chamber at a first flow rate and a second flow rate to grow and obtain a first buffer layer, the method comprises the following steps: firstly, introducing ethylene and trichlorosilane into a reaction chamber at a third flow rate and a fourth flow rate to obtain a second buffer layer through growth, then reducing the temperature of the reaction chamber to an epitaxial layer growth temperature lower than the growth temperature of the buffer layer, and finally introducing ethylene and trichlorosilane into the reaction chamber at a fifth flow rate and a sixth flow rate to obtain an epitaxial layer through growth, the growth temperature of the epitaxial layer is reduced to be lower than the growth temperature of the buffer layer to grow the epitaxial layer, so that the number of epitaxial pits on the surface of the epitaxial wafer obtained by epitaxial growth can be inhibited, and the quality of the silicon carbide epitaxial wafer is effectively improved.

The application relates to a method for synthesizing and refining electronic-grade hexachloroethyldisilane, and specifically, trichlorosilane raw material is mixed with protective gas into a raw material buffer tank, a mixed gas obtained through the mixing is subjected to a catalytic synthesis reaction under the irradiation of an ultraviolet light source, a product obtained through the reaction is subjected to condensation separation, gaseous trichloromethane returns to the raw material buffer tank to continuously participate in the synthesis reaction, the mixed liquid in the cold trap is warmed and vaporized, hexachloroethyldisilane is obtained through two-step refining, and the purity of the product hexachloroethyldisilane can reach the electronic grade. The application takes trichlorosilane as the initial raw material, the price of the raw material is low; the photo-catalysis is used as the synthesis process, the synthesis process is simple, the reaction yield is high, energy is saved, and the environment is protected; the two-step method is used for refining and purifying the product, the depth of the refining and the efficiency of the refining are high, large-scale production is suitable, the monopoly of foreign enterprises is broken, and the application has important significance.

The present invention relates to a high-gloss high-glass-fiber-content nylon 66 composite material and a preparation method thereof, and belongs to the technical field of polymer composite materials. The components of the composite material are: 50-60wt% of alkali-free glass fiber, 2.2-3.5wt% of a high-gloss compatibilizer, 3.5-5wt% of a toughening agent, 0.15-0.2wt% of an antioxidant, and 0.6-0.9wt% of a processing aid, with the remainder being nylon 66 resin; the high-gloss compatibilizer is substituted by n-alkyl alcohol and vinyl trichlorosilane to form intermediate 1, and then intermediate 2 is prepared by initiating addition of methyl thioglycolate and the unsaturated double bond of intermediate 1, and finally amine transesterification is carried out by γ-aminopropyl triethoxysilane and the terminal methyl ester of intermediate 2; the high-gloss compatibilizer effectively reduces the high-crystalline region-low-crystalline region interface content in the composite system, reduces the scattering of light, and thus allows the composite material to maintain a higher gloss.

The invention provides a method for recovering tail gas generated in production of carbon nanotubes. The method comprises the following steps: compression: introducing tail gas containing methane and hydrogen into a compressor for pressurization; first-stage separation: the pressurized tail gas is introduced into a first-stage membrane separator for separation, methane and first-stage tail gas are obtained, and the main component of the first-stage tail gas is hydrogen; and second-stage separation: introducing the first-stage tail gas into a second-stage membrane separator for separation to obtain hydrogen and second-stage tail gas containing hydrogen. Through two-stage membrane separation, methane and hydrogen are recovered, the methane separated in the first stage can return to the continuous furnace to be continuously used as a raw material for producing carbon nanotubes, and the hydrogen separated in the second stage can be used for producing trichlorosilane, so that the recovery and utilization of resources can be realized.