37results about How to "Little change in composition" patented technology

At least (i) dispersing and mixing inorganic oxide filler, solvent and binder so as to produce a coating paint; (ii) supplying the coating paint to a gravure coater; and (iii) coating the coating paint to member via a gravure roll are included. The (i) or (ii) includes allowing the coating paint to stand still and removing an aggregate and a precipitate of inorganic oxide filler.

This invention relates to a changeover method for continuously manufacturing propylene by C4+ alkenes catalytic cracking. The method adopts a reactor with a set of parallel fixed beds. Each fixed bed is operated according to a certain interval, and the products of all fixed bed are mixed and sent to the next process so that the reactant of the next process has stable composition. The method solves the problems of low catalyst activity and large change of product composition at the beginning and end of reaction, which leads to difficulties in stable quality and next process. The method can be used in propylene industrial manufacture by C4+ alkenes catalytic cracking.

The invention provides a production method of heavy-gauge large-single-weight low-alloy high-strength structural steel plates. The method comprises the steps of smelting, casting, electroslag remelting, electroslag ingot cleaning, heating, rolling, water cooling, hydrogen diffusion treatment, supersonic wave flaw detection, normalization, examination and warehousing. The largest thickness of the steel plates produced through the method of the invention can reach 410mm. The method allows the isotropy, the impact toughness and the Z-directional performances of the heavy-gauge steel plates to be realized through adopting large slab electroslag remelting treatment and a reasonable controlled rolling and heat treatment technology, the production cost to be reduced, the time of delivery to be substantially shortened and the specification range to be wide, and is used for satisfying continuously increased market application amount demands; and the steel plates can completely substitute import products to satisfy various requirements of heavy-gauge large-single-weight steel plates applied to water power, wind power and large building structures.

The invention discloses a method for producing a large-thickness lamination-crack-resistant tempered high-strength steel plate. The method is characterized by comprising the steps: smelting, performing continuous casting, performing electroslag remelting, heating, rolling, annealing and performing heat treatment. The steel plate comprises the following chemical components in percentage by weight: 0.14-0.18 percent of C, 0.20-0.50 percent of Si, 0.95-1.25 percent of Mn, less than or equal to 0.015 percent of P, less than or equal to 0.005 percent of S, 0.80-1.15 percent of Ni, 0.40-0.60 percent of Cr, 0.40-0.60 percent of Mo, 0.020-0.050 percent of Nb, 0.010-0.030 percent of Ti, 0.020-0.045 percent of TAl, and the balance of Fe and inevitable impurities. According to the method, electroslag remelting treatment is adopted, good overall performance of the large-thickness steel plate with the diameter of 30mm can be met due to the reasonable controlled rolling and heat treatment process, and the production cost is reduced; and the specification range is wide. The method adopts the steps of electric furnace smelting, continuous casting and electroslag remelting smelting, the contents of P and S in the obtained tempered high-strength steel plate are low, and the steel is pure; and moreover, a large-slab electroslag remelting technology is adopted, the round ingot hammer cogging process during electroslag remelting is reduced, the production period is shortened, and the cost is obviously reduced.

A perovskite oxide film is formed on a substrate, in which the perovskite oxide film has an average film thickness of not less than 5 μm and includes a perovskite oxide represented by a general formula (P) given below:

(K_1−w−x, A_w, B_x)(Nb_1−y−z, C_y, D_z)O₃ - - - (P),

where: 0<w<1.0, 0≦x≦0.2, 0≦y<1.0, 0≦z≦0.2, 0<w+x<1.0, A is an A-site element having an ionic valence of 1 other than K, B is an A-site element, C is a B-site element having an ionic valence of 5, D is a B-site element, each of A to D is one kind or a plurality of kinds of metal elements.

The invention relates to a polylol compound phase-change material and a preparation method thereof. The compound phase-change material takes butantetraol, pentaerythrotol and xylitol powder as raw materials and is prepared through the following steps: carrying out manual grinding, ball milling or sand milling on a mixture of the butantetraol, the pentaerythrotol and the xylitol for 1h to 3h; then heating the mixture at 185 DEG C to 190 DEG C for 3h to 6h until all the powder is completely melted to form transparent liquid; finally, naturally cooling the transparent liquid to form the white and solid polylol compound phase-change material, wherein the mass percent content of the butantetraol is 60 percent to 75 percent, the mass percent content of the pentaerythrotol is 24 percent to 35 percent and the mass percent content of the xylitol is 1 percent to 5 percent. The polylol compound phase-change material has the advantages of high phase-change enthalpy value, small super-cooling degree, stable melting point and the like, and can be used in the fields of solar heat energy storage, industrial residual heat recycling and the like.

The invention relates to a preparation method of a Cu-Ti2 AlC functionally gradient material. The preparation method is characterized in that a composite material which contains pure Cu or main ingredient Cu is formed at one side of the prepared gradient material; the compound which contains pure Ti2AlC or main ingredient Ti2AlC is arranged at the other side of the prepared gradient material; 1-4 interlayers are arranged; the contents of Cu and Ti2AlC change in gradient along with the thickness direction, and gradually change along with the performance; the hardness and strength of the material are obviously improved along with the direction from Cu to enriched Ti2AlC; the oxidation resistance and the anti-high temperature performance are improved; the wear-resisting property and the elastic modulus are gradually improved; and the toughness, the electric conductivity and the thermal conductivity are obviously improved along the direction from Ti2AlC to enriched Cu. The material has significance as to a special environment which has different operational performances as to different contact surfaces; the material is prepared from Cu and Ti2AlC powder used as raw materials in a manner of hot-pressed sintering under certain atmosphere after evenly mixing and layered charging, wherein the sintering temperature is 800-1000 DEG C; the heating rate is 8-20 DEG C/min; the pressure is 20-40 MPa; and heat preservation time is 0.5-3 hours. By adopting a hot-pressed sintering method, the prepared gradient material is high in compactness, excellent in performance, and good in industrialized prospect.

Provided is an etching liquid that contains: hydrofluoric acid (A); ammonium fluoride (B); a salt (C) that comprises an acid (C1) having a higher pKa than hydrofluoric acid (which has a pKa of 3.17) and a base (C2) having higher pKa than ammonium (which has a pKa of 9.24); and water (D). As a result, the liquid chemical does not change much in composition upon evaporation and the like, has a low exchange frequency, and can etch silicon dioxide films with uniformity over time as well.

The invention provides a device and a method for preparing SAN resin with stable composition and low volatile components, and belongs to the field of high polymer material preparation methods. According to the method, the SAN resin is prepared by adopting continuous bulk polymerization of thermal-initiated free radicals, acrylonitrile steam is controlled to instantaneously condense and flow back to a reaction kettle to participate in polymerization at the top of the kettle through a built-in condensing coil at the top of the polymerization kettle, and stable composition of styrene and acrylonitrile monomers and the final SAN resin in a reaction system is ensured. A two-stage devolatilization mode in which two static flash tanks are connected in series in the conventional SAN resin preparation process is optimized into a one-stage flash tank static devolatilization and two-stage double-screw devolatilization extruder dynamic devolatilization mode, so that the thermal degradation risk of the SAN resin at the high temperature of the two-stage devolatilization device is effectively reduced, and the mechanical property, transparency and appearance quality of the SAN resin are improved. Meanwhile, compared with the devolatilization effect of a two-stage series static flash tank, the volatile component content of the SAN resin obtained by the process is lower and can reach 600-700ppm.

The present invention relates to a green tea juice clarification method and belongs to the processing field of drink and especially green tea drink. The green tea juice clarification method comprises the following steps: green tea leaves are taken and cleaned, deionized water of 10-12 times of the weight of the tea leaves at a temperature of 95 DEG C is added, the tea leaves are subjected to temperature constant water bath at a constant temperature of 90 DEG C for 15 min, then the treated tea leaves are filtered using a 200 mesh filtering cloth, the filtrate is cooled to obtain a tea juice, then at room temperature, a clarifying agent is added into the tea juice, and the mixture is stirred and filtered after 60 min to obtain clarified green tea juice. The prepared green tea juice by the green tea juice clarification method is good in clarification effects and the light transmission is more than 97.6%. Besides, the green tea juice has no big differences in tastes and fragrance compared to the control. The main ingredients of the prepared green tea are less in changes and the soup color is more clarified and translucent.

The invention relates to daily high-silicon reinforced porcelain and a preparation method thereof, in particular to high-silicon daily reinforced porcelain prepared by taking Longyan sand head as a main raw material, and belongs to the field of daily reinforced porcelain. The porcelain body is mainly composed of the following components in percentage by mass: 40 to 70% of Longyan sand head, 0 to 10% of feldspar mineral, and 25 to 50% of clay mineral. According to the method, feldspar and quartz can be completely provided by the Longyan sand head, a large amount of high-quality feldspar and quartz resources are saved, waste sand head resources are fully utilized, and the method has huge social, economic and technical values.

The present invention discloses an azeotropic or azeotrope-like composition comprising a first component 1, 1, 1, 2, 2, 3, 4, 5, 5, 5-decafluoropentane and a second component selected from the group consisting of Z-1, 2-dichloro-3, 3, 3-trifluoropropene or E-1, 2-dichloro-3, 3, 3-trifluoropropene wherein the second component is present in an amount effective to form an azeotropic or azeotrope-like mixture with 1, 1, 1, 2, 2, 3, 4, 5, 5, 5-decafluoropentane. The invention also discloses a preparation method of the azeotropic or azeotrope-like composition. The composition provided by the invention has the advantages of low GWP, environmental protection and small temperature slip.

The invention provides a polysulfone dialysis membrane, and a production method and an application thereof. A polysulfone-polyethylene glycol block copolymer in the production method is used as a pore forming agent. The production method comprises the following steps: dissolving 10-25 parts by weight of polysulfone and 1-25 parts by weight of the polysulfone-polyethylene glycol block copolymer in 60-100 parts by weight of an organic solvent, and mixing above materials and the organic solvent to prepare a membrane casting solution; and cooling and defoaming the membrane casting solution, pouring the obtained solution onto a substrate, scraping a membrane, volatilizing the organic solvent in the membrane casting solution, placing the volatilized solution, solidifying the solution to form a membrane, and immersing the formed membrane in water to completely displace the organic solvent in the membrane in order to obtain the polysulfone dialysis membrane. The polysulfone-polyethylene glycol block copolymer used as the pore forming agent promotes the formation of membrane pores, so the pore forming agent is firmly anchored to the surface of the polysulfone base membrane, the loss problem of a hydrophilic pore forming agent is solved, and the membrane is endowed with a permanent hydrophilic property; and the polysulfone dialysis membrane also has the advantages of high membrane flux, high flux recovery rate and good stability.

The invention relates to a conducting bar for power transmission, in particular to an electroplating production method and a device for a copper/aluminum composite conducting bar under the action of ultrasound and an electric magnetic field. The electroplating production method and the device are characterized in that the less change for a traditional process of a copper/aluminum composite conducting bar is carried out; no special requirements for a substrate material and the state of the substrate material are needed; in the traditional method for producing the copper/aluminum composite conducting bar: firstly, ultrasonic wave cleaning is applied in the cleaning process, so that the aluminum bar can be better cleaned; and secondly, the electric magnetic filed is applied in the main plating process for carrying out electromagnetic stirring on an electroplating liquid and improving the distribution of electroplating ions in the electroplating liquid; the electromagnetic stirring realizes non-contact stirring, so that the pollution to the electroplating liquid is avoided; and in addition, the stirring strength is easily and accurately controlled and the goals of low production cost and uniform and compact coating of the copper/aluminum composite conducting bar are achieved.