56results about How to "Stable industrial production" patented technology

The invention discloses a steel used at a lower temperature and a method for manufacturing the same. The steel comprises the following chemical components by weight percentage: 0.060 to 0.090 percent of C, less than or equal to 0.20 percent of Si, 1.10 to 1.50 percent of Mn, less than or equal to 0.015 percent of P, less than or equal to 0.003 percent of S, 0.040 to 0.070 percent of Als, 0.05 to 0.45 percent of Cu, 0.05 to 0.35 percent of Ni, 0.05 to 0.30 percent of Cr, 0.007 to 0.011 percent of Ti, 0.007 to 0.020 percent of Nb, less than or equal to 0.0040 percent of N, 0.001 to 0.011 percent of Ca, and the balance of Fe and inevitable impurities. The manufacturing process comprises of the steps: making the steel plate obtain excellent low-temperature toughness and making the steel platebear the big line energy welding. The steel and the method can be widely applied to petroleum natural gas pipelines, low-temperature gas tank bodies LPG, low temperature steel plates of LNG.

The invention discloses high-toughness and high-weather-resistance steel and a manufacturing method thereof. The high-toughness and high-weather-resistance steel comprises the following components in percentage by weight: 0.035-0.075% of C, no more than 0.30% of Si, 0.40-0.80% of Mn, 0.07-0.11% of P, no more than 0.004% of S, 0.20-0.50% of Cu, 0.10-0.40% of Ni, 0.40-0.70% of Cr, 0.008-0.016% of Ti, 0.010-0.030% of Nb, no more than 0.0050% of N, 0.001%-0. 004% of Ca, and the balance of Fe and unavoidable impurities, wherein by taking a C-Mn-P component system with low C, low Mn and high P as a foundation and through the alloying of Cu, Ni and Cr, [%C] / [%P] is controlled to be not smaller than 0.49, [%Mn] / [%C] is controlled to be not smaller than 10, the weather resistance index DNH is controlled to be not smaller than 6.50%, [%C]*([%P]+2.5[%S]) is controlled to be not more than 0.0025, [%Ca] / [%S] is controlled to be equal to 1.0-3.0, ([%Cu]+0.36[%Ni]+0.27[%Cr])*[%P] is controlled to be not smaller than 0.030, [%Ca]*[%S]0.28 is controlled to be not more than 0.002, and a TMCP (ThermoMechanical Control Process) is adopted. Therefore, the high-toughness and high-weather-resistance steel has excellent low-temperature toughness, bending cold machining characteristic and high weather resistance, and is suitable to be used as a compartment body structure of a coating-free high-speed train.

A high-strength polyethene fibre with high breaking strength (15-45 g / d) and modulus (500-1500 g / d) is prepared from ultrahigh-molecular polyethene solution through dry spinning by spinneret, longitudinally drafting and solidifying.

The invention provides a new process for using the enzyme owned by tea to converting tea polyphenol in the tea into theaflavin through biotransformation. The preparation process is as follows: adding fermenting enzyme made from fresh tea into green tea extracted by ethyl acetate, carrying out stirring and fermentation under the condition of pure oxygen, then going through separation, concentration, washing, conversion dissolving and filtration, and at last carrying out vacuum freeze drying, crushing and screening to obtain qualified theaflavin product. The theaflavin product made through the process has a stable quality, high theaflavin content, high yield and low cost. In addition, the method adopts pure ester phase oxidative fermentation, thereby solving the problem that the three phases are incapable of being separated after the traditional ester, water and refuse mixed-phase fermentation, and consequently carrying out stable and controllable industrialized production.

The invention relates to a preparation method of a poly (p-phenylene terephthalamide) polymer, which comprises the following steps: adjusting the molar ratio of p-phenylenediamine PPDA to terephthaloyl chloride TPC reaction monomer to determine the critical non-gel point of the polymerization reaction; preparing two kinds of low molecular weight poly (p-phenylene terephthalamide) polymer systems with amino group and acyl chloride group as terminal groups at critical non-gel point; subjecting the two kinds of polymer systems to second copolymerization to obtain the poly (p-phenylene terephthalamide) polymer with high molecular weight. The invention prepares two kinds of low molecular weight poly (p-phenylene terephthalamide) pre-polymer systems with different terminal groups, and the systems can stably exist for certain time, and the PPTA with high molecular weight and good solubility in concentrated sulfuric acid can be obtained by copolymerization. The reaction process is stable and easy to control, which is conducive to the industrial production of poly (p-phenylene terephthalamide) fiber.