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

The invention discloses a method for preparing silver micro-powder for high-temperature sintering silver pastes, which comprises the following steps: preparing a colloidal liquid silver system, a colloidal reduction system and protection solution firstly; then mixing the three. In the invention, a sol gel process and a solution chemical reduction method are used to effectively control the reaction process, so that the industrialized production can be performed stably, and the uniform reaction under the condition of production enlarging still can be ensured, thereby greatly improving the uniformities of shapes and other superficial characteristics of silver particles generated by reaction, and eventually generating flocculating soft silver powder wodges which are easy to carry out post-processing such as collecting and washing, and the like.

The invention discloses high-fill high-heat-resistance polyvinyl alcohol-based microcellular foam type flame retardant paper.The microcellular foam type flame retardant paper is prepared through the steps that polyvinyl alcohol and a plasticizing foaming agent are mixed and swelled and then mixed with an inorganic flame retardant and a flame retardant synergist to obtain composite powder; the composite powder is added into a screw extruder for microcellular foam extrusion, cooling traction, flattening and winding are conducted.The vertical burning class is V-0, the limit oxygen index is 35%-41%, the tensile strength is 1.0-4.5 MPa, the apparent density is 0.05-0.50 g / cm<3>, the average cell diameter is 70-200 micrometers, and the thickness is 0.1-2.0 mm.The flame retardant paper is excellent in thermal resistance, can meet the requirement of rapid laser printing, is excellent in comprehensive performance and low in cost and can be prepared by directly adopting a thermoplastic processing method, the technology is simple and easy to operate, and continuous industrialized production can be achieved.

The preparation process of chromium-rich beer yeast includes two-stage seed culture of the selected beer yeast monocolony; fermenting in a fermentor at pH 5.6-6.0 and 27-29 deg.c for 9-11 hr to OD600 not lower than 9.0; regulating pH to 5.5-5.6, adding trivalent Cr to 0.10-0.15 g / L and adding malt wort in the amount of 30-50 vol% of initial fermented liquid; fermentation until reaching the total fermentation time of 40-50 hr; centrifugally collecting thallus, washing with super-pure water, spray drying to obtain the dry beer yeast powder with bioactive chromium content of 222-318 microgram / g. The said preparation process has high beer yeast GTF content and is simple and practical.

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 discloses a high-flux thick polytetrafluoroethylene film and a preparation method thereof. The method comprises the following steps that 1, a plurality of single-layer polytetrafluoroethylene films are aligned and overlapped to form an overlapped multilayer film; 2, the overlapped multilayer film is fed into a hot air bonding device through a feeding roll, and I-time bonding treatment is carried out through hot airflow I so that the upper surface of the overlapped multilayer film can absorb heat to be softened and be bonded with the polytetrafluoroethylene film on the lower layer; 3, tension is adjusted; 4, II-time hot air bonding treatment is carried out through hot airflow II so that the lower surface of the multilayer composite film can absorb heat to be softened and be bonded with the adjacently-bonded polytetrafluoroethylene film; 5, the tension is adjusted; 6, winding output is carried out. The high-flux thick polytetrafluoroethylene film is high in porosity and good in gas permeability and covers non-woven filter felt to be manufactured into a filter material, the filter efficiency on fine particles in high-temperature flue gas is high, and the service life of a high-temperature filter material can be prolonged.

The invention provides a method and a system for producing needle coke raw material oil by performing reduced pressure distillation on catalytic slurry oil to remove solid from aromatic hydrocarbon oil. According to the invention, aromatic hydrocarbon-rich oil with high economic value is obtained by comprehensively utilizing catalytic slurry oil, and the problem that the solid ash content of needle coke raw material oil prepared from the slurry oil is limited to be too high is solved by an efficient solid removal means; the traditional oil slurry comprehensive utilization method is difficult to achieve stable industrial production and low in solid removal efficiency, the ash content of the treated oil slurry can only be reduced to 300 ppm to 500 ppm, and the requirement for high-added-value application of the oil slurry cannot be met; the method of the invention is different from the traditional oil slurry comprehensive utilization method, adopts an efficient oil slurry solid removal technical means, and substantially improves the quality of the aromatic hydrocarbon-rich oil serving as the needle coke raw material oil; and the ash content of the oil slurry treated by the method disclosed by the invention can be reduced to be below 100 ppm, even below 10 ppm, which is far higher than that of the traditional comprehensive utilization method of the oil slurry, so that the processof converting the catalytic oil slurry which is difficult to treat and low in economic additional value into needle coke raw material oil with high additional value is realized.

The invention discloses a large-scale vegetative propagation production method of an epipremnum pinnata seedling. The method is achieved by five steps: cultivation of a mother plant, pretreatment and explant collection, sterile material obtaining, domestication and subculture propagation of the sterile material, strong seedling root cultivation, and greenhouse planting. The perennial epipremnum pinnata which is excellent, healthy, and free of plant diseases and insect pests and has female characters is taken as a breeder's seed; the mother plant is cultivated by a cutting seedling obtained from the breeder's seed in a planting manner; a culture medium subjected to inducing, propagation expanding, cultivation and rooting is optimized and improved; rough buds of which the bud roughness is greater than 2.5mm are cut according to 2-4 buds in a cluster when transgenerational clumps are cut; small buds of which the bud roughness is smaller than or equal to 2.5mm are cut by the clumps of 8-10mm; the culture conditions of tissue culture seedlings at each stage are optimized; stable growth in cultivation can be ensured. By adopting the method disclosed by the invention, a great quantity of high-quality nursery-grown plants can be obtained within a short period of time.

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 discloses high-fill high-heat-resistance polyvinyl alcohol-based microcellular foam type flame retardant paper.The microcellular foam type flame retardant paper is prepared through the steps that polyvinyl alcohol and a plasticizing foaming agent are mixed and swelled and then mixed with an inorganic flame retardant and a flame retardant synergist to obtain composite powder; the composite powder is added into a screw extruder for microcellular foam extrusion, cooling traction, flattening and winding are conducted.The vertical burning class is V-0, the limit oxygen index is 35%-41%, the tensile strength is 1.0-4.5 MPa, the apparent density is 0.05-0.50 g / cm<3>, the average cell diameter is 70-200 micrometers, and the thickness is 0.1-2.0 mm.The flame retardant paper is excellent in thermal resistance, can meet the requirement of rapid laser printing, is excellent in comprehensive performance and low in cost and can be prepared by directly adopting a thermoplastic processing method, the technology is simple and easy to operate, and continuous industrialized production can be achieved.

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.

The invention discloses a method for preparing silver micro-powder for high-temperature sintering silver pastes, which comprises the following steps: preparing a colloidal liquid silver system, a colloidal reduction system and protection solution firstly; then mixing the three. In the invention, a sol gel process and a solution chemical reduction method are used to effectively control the reaction process, so that the industrialized production can be performed stably, and the uniform reaction under the condition of production enlarging still can be ensured, thereby greatly improving the uniformities of shapes and other superficial characteristics of silver particles generated by reaction, and eventually generating flocculating soft silver powder wodges which are easy to carry out post-processing such as collecting and washing, and the like.