11 results about "Acetylene" patented technology

The invention discloses an antistatic polyfluortetraethylene film and a preparation method thereof, the method comprises the steps of: at first, utilizing 100 parts of polyfluortetraethylene powders and 1-20 parts of an antistatic agent to be admixed in a high-speed agitator, wherein, such an antistatic agent is a composite antistatic agent consisting of acetylene carbon black, graphite, metal conductive powders and the like; then preparing an antistatic polyfluortetraethylene film by means of mixing raw materials, prepressing and performing, sintering at high temperature, film forming by turning, trimming, winding and the like. The antistatic polyfluortetraethylene film prepared according to the invention has a permanent antistatic effect and can sufficiently dissipate the charges accumulated on the surface thereof owing to friction, the added antistatic agent powders can also cooperate and reinforce therewith to a certain extent, thus overcoming the characteristics of inferior abrasive resistance and low hardness, and improving the mechanical performance of the polyfluortetraethylene.

The invention discloses a method for separating low-carbon olefin gas. The method is used for overcoming the disadvantages in existing low-carbon olefin separation methods that cryogenic separation is complicated in process flow, large in investment and the like. The method comprises the following steps: the low-carbon olefin gas enters a deethanization tower after the low-carbon olefin gas is compressed and dried, a tower bottom material flow of the deethanization tower is conveyed to a depropanization and propylene distillation system so as to separate polymer-grade propylene products, and a tower top material flow of the deethanization tower enters a demethanization tower; and a tower bottom material flow of the demethanization tower is conveyed to an acetylene converter and an ethylene distillation tower, a tower top material flow of the demethanization tower is conveyed to an absorption tower and is in contact with an absorbent, a tower top gaseous-phase material flow of the absorption tower is output or enters a fuel gas system, and a tower bottom material flow of the absorption tower is conveyed to the deethanization tower. The method disclosed by the invention has the advantage that the cryogenic separation is simple in process flow and small in investment and can be used for producing target products, such as polymer-grade ethylene, polymer-grade propylene and the like.

The invention discloses a trivalent copper catalyst and a preparation method thereof and application to hydrochlorination of acetylene. The preparation method of the trivalent copper catalyst comprises the steps that a nitrogen-containing heterocyclic compound and copper salt are added into a trichloromethane solution to mix to obtain a mixed solution A containing a bivalent copper compound; ionicliquid is added into the obtained mixed solution A, and under the action of an oxidant, a mixed solution B containing a trivalent copper compound is obtained; and a porous solid carrier is immersed in the obtained mixed solution B containing the trivalent copper compound for 0.5-5 h, then the treated solid is taken out, and heated and dried under the condition of blue light irradiation, and the trivalent copper catalyst is obtained. The trivalent copper catalyst is used for the reaction of acetylene hydrochlorination to prepare vinyl chloride. The trivalent copper catalyst is prepared by simple operation steps, the stability and activity of the catalyst are improved, the production cost is lowered, and good application prospect is achieved.

The invention provides a preparation method of a high-strength tire curing bladder, and relates to the technical field of tire curing bladder production and processing. In a component of the tire curing bladder, raw rubber comprises butyl rubber and brominated butyl rubber; a filler comprises carbon black, acetylene carbon black, graphite and aluminum oxide; an active agent is zinc oxide master batch particles; a processing aid comprises stearic acid and paraffin; a vulcanizing agent comprises vulcanized resin and sulfur; wherein the unsaturation degree of the butyl rubber is 0.5-2%, and the brominated butyl rubber contains 1.5-2.5% of bromine. The preparation method comprises following steps: carrying out three-stage rubber mixing to process a rubber sheet, and then injecting and vulcanizing to obtain the tire curing bladder. Compared with the prior art, the invention has the advantages that the butyl rubber and the brominated butyl rubber are used as raw rubber, and an adopted rubberextruder is three-stage rubber mixing equipment, so that high-temperature mixing time is shortened, the stability of the brominated butyl rubber is maintained, the purpose of uniform mixing is achieved, and the vulcanization time can be shortened while the strength is improved.

The invention relates to the technical field of aluminum-air batteries. Aiming at the problem of complex preparation process of an aluminum-air battery cathode reduction catalyst in the prior art, theinvention discloses a preparation method of the aluminum-air battery cathode reduction catalyst. The method comprises the following steps: (1) preparing carbon-supported zinc oxide: mixing zinc oxidewith activated carbon, adding absolute ethyl alcohol, carrying out ball milling for 6-8 hours, sieving the material, and performing drying; (2) preparing an air electrode: mixing carbon-loaded zinc oxide with acetylene black, conductive carbon black and a PTFE solution, and pressing the mixture into the air electrode; (3) reducing zinc oxide: in a sodium hydroxide solution, reducing zinc oxide inthe electrode into zinc by a pure zinc sheet; and (4) preparation of catalyst silver: soaking the electrode in a silver nitrate solution for 15-18 hours, cleaning, and carrying out vacuum drying to obtain a finished product. The catalyst is prepared by adopting an in-situ method, the particle size of the catalyst is nanoscale, the catalyst has strong binding force with carrier carbon and is uniformly dispersed, the catalytic activity is good, the preparation process is simple, and the synthesis cost is low.

The invention discloses a handheld oxygen-acetylene welding torch. The handheld oxygen-acetylene welding torch comprises a welding torch body, a clamp arranged on the welding torch body in a sleeving manner and a handle, wherein the handle and the clamp are fixedly welded. The portion between one end of the handle and the face of the clamp is arranged obliquely. Connecting through holes are formed in the folded edge of the clamp. The clamp is fixedly mounted on the welding torch body through fasteners in the connecting through holes. The handheld oxygen-acetylene welding torch is used for welding, operation is convenient, the welding defects such as burnthrough, lack of penetration and undercutting can be reduced better, the quality is stable, and meanwhile the production efficiency is improved. The handheld oxygen-acetylene welding torch is especially suitable for oxygen-acetylene welding of thin parts such as aluminum alloys.

The invention discloses LNg synergistic metal cutting gas. The LNg synergistic metal cutting gas consists of liquefied natural gas and a synergistic additive, wherein the synergistic additive consists of 10-15% of castor oil, 10-20% of methanol, 10-20% of octanol, 4-5% of alkyl sodium sulfonate and 56-65% of 150# solvent oil; and natural gas metal cutting gas is composed of the following components in parts by weight: 98.4 to 98.7 parts of liquefied natural gas and 1.3 to 1.6 parts of synergistic additive. According to the LNg synergistic metal cutting gas, after the additive capable of saving energy and increasing the combustion efficiency is added, the flame temperature is increased, meanwhile, the combustion efficiency of natural gas is effectively improved, the metal cutting function is improved, and the effect comprehensively reaches and exceeds the corresponding level of traditional dissolved acetylene gas; and the cutting preheating speed and the cutting speed of a steel plate are about 31.9% and 21.6% higher than those of a steel plate with dissolved acetylene gas respectively, and the section of a cutting seam is smooth.

The present invention discloses a film thickness monitoring method for amorphous carbon film, the method comprises following steps: Step 1: using acetylene as a carbon source gas for amorphous carbon film growth, where the acetylene is stored in an acetylene steel cylinder and acetone is used as a solvent for acetylene in an acetylene cylinder. And step 2: monitoring the amount of the acetylene in the acetylene cylinder in real time for online monitoring thickness of the amorphous carbon film. The method can quickly predict the thickness of the amorphous carbon film, saves wafer, time and labor costs.

The invention discloses a system and method for purifying acetylene gas and a system and method for preparing ethylene by acetylene hydrogenation. The system for purifying the acetylene gas comprisesan acetylene feeding device, a first three-way valve, a first purifier, a second purifier, a second three-way valve, a nitrogen gas feeding device and an air feeding device, wherein when the acetylenefeeding device is used for feeding the acetylene to one of the first purifier and the second purifier, the nitrogen gas feeding device and the air feeding device are used for feeding air and nitrogengas to the other one of the first purifier and the second purifier; meanwhile, a heating device of the other one of the first purifier and the second purifier is started. The system for purifying theacetylene gas, provided by the invention, is simple and convenient to operate and stable to run; a purifying agent is cheap and easy to obtain and can be recycled; when the system is used for purifying the acetylene gas, the acetylene gas in a steel bottle can be continuously and efficiently purified.

The invention discloses a method for measuring trace elements in fly ash of an European smelting furnace, which comprises the following steps: weighing 0.1000 +/-0.0001 g of sample in a fired constant-weight cupel, firing at about 800 +/-10 DEG C for 30 minutes until the weight is constant, cooling, and transferring into a polytetrafluoroethylene beaker; the method comprises the following steps of: adding a proper amount of pure iron for bottoming, wetting by using a small amount of water, adding 10mL of hydrochloric acid and 5mL of hydrofluoric acid, heating to dissolve a sample, steaming to be nearly dry, dropwise adding 2mL of perchloric acid, steaming to be nearly dry, removing the hydrofluoric acid, taking down, cooling, adding 5mL of hydrochloric acid in a ratio of 1: 1 to dissolve salts, cooling, filtering, transferring into a 100mL plastic volumetric flask, diluting by using water to a scale, uniformly mixing, and if the element content is too high, judging whether the element content is too high or not. Diluting and then measuring, drawing a calibration curve, and measuring on an atomic absorption spectrometer; the atomic vapor generated by atomization in the air-acetylene flame absorbs the light with the characteristic wavelength emitted from the specific hollow cathode lamp, and the content of the measured element can be obtained by using the measured absorbance.