669results about How to "Improve thermoplasticity" patented technology

The invention relates a novel high temperature resistant polyimide foam and the preparation process thereof is as follows: (1) firstly, 2, 3, 3', 4'-biphenyl tetracarboxylic dianhydride or 2, 3, 3', 4'-biphenyl tetracarboxylic dianhydride and another type of aromatic dianhydride are heated and refluxed in a fatty alcohol solution so as to change the tetracarboxylic dianhydride into diacid diester; (2) in accordance with a certain proportion, the obtained diacid diester is synthesized into a precursor solution with one type or more of aromatic diamine and a blocking agent of acetylenyl benzene and a certain quantity of foam stabilizer is added into the solution; (3) the solution is heated to remove tiny molecule volatile matter and obtain a polymide precursor powder; and (4) the precursor powder is filled into a mould to be frothed at high temperature and carries out imidization so as to obtain the polyimide foam. The density of the novel high temperature resistant polyimide foam is 10 kg/m<3> to 500 kg/m<3> and the vitrified transformation temperature is over 350 DEG C; and the foam is characterized by excellent high temperature resistance, low temperature resistance, mechanical properties and functions of anti flaming, heat insulation or noise reduction.

The invention relates to duplex stainless steel. The duplex stainless steel comprises the following chemical components in percent by weight: 0.01-0.08% of C, 0.2-1.0% of Si, 1.5-3.5% of Mn, 19.0-21.0% of Cr, 1.2-2.8% of Ni, 0.08-0.18% of N, less than or equal to 0.5% of Mo, less than or equal to 1.0% of W, less than or equal to 1.0% of Cu and the balance of Fe and inevitable impurities; PREN (Pitting Resistance Equivalent Number) is 20-24, the martensitic temperature Md formed by strain induction is 60-130 DEG C. A manufacturing method comprises the following steps of: selecting vacuum induction smelting in an electric furnace, argon oxygen decarburization (AOD) or electric furnace, argon oxygen decarburization (AOD), external refining and LF (Ladle Furnace) smelting; carrying out die casting or continuous casting on molten steel, controlling the superheat degree to be 20-50 DEG C in die casting, matching with fast cooling, preventing nitrogen from escaping, and controlling the overheat degree to be 20-50 DEG C and the plate blank casting speed to be 0.8-2m/min; and putting a die-casting blank or a continuous casting blank into a heating furnace for heating to 1100-1250 DEG C, preserving the heat for 0.5-1.5 hours, processing the die-casting blank or the continuous casting blank on a forging production line or a hot-rolling mill group to the needed thickness, then carrying out annealing at the speed of 0.5-2.5min/mm and the temperature of 1030-1150 DEG C. The obtained duplex stainless steel has excellent corrosion resistance and TRIP effect.

The invention relates to a high-plasticity economical duplex stainless steel and a manufacturing method thereof. The high-plasticity economical duplex stainless steel comprises the following chemical components by weight part: 0.01-0.06% of C, 0.1-1.0% of Si, 0.5-4.0% of Mn, 19.5-22.0% of Cr, 1.8-3.5% of Ni, 0.1-0.18% of N, 0.5-1.3% of Mo, 0.1-1.0% of Cu and the balance of Fe and inevitable impurities. According to the invention, Ni is replaced by Mn and N, so that the cost is lowered; the contents of Cr and Mo are adjusted, so that the steel has excellent corrosion resistance, higher plasticity, excellent low-temperature toughness, and excellent welding property; the Md 30/50 is controlled at 50-100 DEG C; and PREN value is 23-29. Thus, the high-plasticity economical duplex stainless steel can be widely applied to an environment with higher demand on corrosion resistance and plasticity, such as heat exchanger, water tank, and the like, so that the 304 austenitic stainless steel containing 8% of nickel and the 316 stainless steel containing of 10% Ni and 2% of Mo are replaced under the conditions of room temperature and low temperature.

The invention discloses a no glue bonding middle or high-density fiberboard preparation method, its process steps are: (1) preparing dissolvant; (2)collecting and processing plant fiber materials; (3) feeding materials; (4) reaction; (5) solvent recovery; (6) beating and separating hemi-cellulose; (7) activating lignin; (8) render hydrophobic; (9) blank plate pavement; (10) hot (or cold) pressure molding. The advantages are: (1) the problem of free formaldehyde releasing in middle fiber plate is completely resolved; (2) so the herbaceous plant fiber has same economic value with woody plant and is used in the production of middle or high-density fiberboard fully; (3) the plant fiber materials are used fully, it basically has not the waste emissions problems.

Fulvestrant nanosphere/microsphere and preparation method and use thereof are provided in the present invention. The carrier material of the fulvestrant nanosphere/microsphere is methoxy ended polyethylene glycol-polylactic acid block copolymer. The nanosphere/microsphere is prepared by solvent-nonsolvent method, in-liquid drying method and/or spray drying method, and has the features of high drug loading and high encapsulation efficiency, controllable release of medicine and no irritant to application site or blood vessel. The fulvestrant nanosphere/microsphere can be used to treat metastatic advanced breast cancer in post-menopausal woman.

The invention discloses a lead-free easy-cutting magnesium silicon brass, belonging to the manufacturing technology field of metal materials. The components of the brass comprise alloying elements, such as copper, zinc, silicon, magnesium, aluminum and the like, and the mass fractions of the elements are as follows: 58.0 percent to 80.0 percent of copper, 0.2 percent to 3.5 percent of magnesium, 0.2 percent to 3.5 percent of silicon and 0 to 0.6 percent of aluminum. The sum of the mass fractions of silicon and magnesium is 1.2 percent to 4.0 percent, the impurity amount is not more than 0.05 percent and the balance is zinc. The lead-free easy-cutting magnesium silicon brass is developed on the basis of the existing easy-cutting lead brass and Bi brass and aiming at the demand of brass parts for cutting process and the application environment of finished products. According to the demand for products containing lead at home and abroad, the lead brass is forced to be replaced by lead-free products. The magnesium silicon brass uses silicon and magnesium to replace lead, realizing the purpose of lead-free easy-cutting lead brass. The brass has good cutting and processing properties, has no cold shortness and hot shortness phenomena, can be used in fields, such as electrics and electronics, bathroom wares, toy devices and the like and can replace the existing easy-cutting lead brass and lead-free easy-cutting Bi brass.

The invention provides ultrahigh-hardness high-toughness malleable spray-formed high-speed steel and a preparation method of the steel, belonging to the field of material and preparation. The steel comprises the following chemical compositions: 1.3-1.8% of C, 6-8% of W, 5-7% of Mo, 4-6% of Cr, 3-5% of V and 1-3% of Nb, wherein Si is less than or equal to 0.4, Mn is less than or equal to 0.4, S is less than or equal to 0.03, P is less than or equal to 0.03, and the balance of Fe. Technologically, the method comprises the following steps of: obtaining a columnar deposition billet with the tissue size being 15-30mum and the carbide size being 3-8mum on a base plate by adjusting the angle of an atomizing nozzle, controlling the speed of a pull base plate, heating a deposition plate, slowing down the temperature reduction of deposited steel liquid, and atomizing the solution into solution drops; annealing under the temperature of 1100-1180 DEG C before the deposition billet is forged, and gradually forging according to the technology when the deposition billet is forged, wherein the forging ratio of each fire is not more than 35%, the forging heating temperature is 1130-1180 DEG C, and the final forging temperature is not less than 900 DEG C; and further refining the sizes of the forged crystalline grain and the carbide into 10-15mum and 2-5mun. The ultrahigh-hardness high-toughness malleable spray-formed high-speed steel and the preparation method of the steel have the advantages of low cost, and short technological process, the cost of the spray-formed high-speed steel is only 1/5-1/10 of that of the power high-speed steel, and the technological process is reduced by 2/3; and the spray-formed high-speed steel has the high hardness and the red hardness, which are close to those of the similar powder high-speed steel, and the toughness of the spray-formed high-speed steel is higher than that of the powder high-speed steel.

The invention belongs to the technical field of aluminum alloy production, and relates to a machining method for 7-series aluminum alloy thick plates. Aluminum alloy ingots comprise the following components in percentage by mass: Si not more than 0.20%, Fe not more than 0.25%, 1.2-2.1% of Cu, 1.2-2.2% of Mg, 5.0-7.0% of Zn, 0.02-0.15% of Ti, 0.02-0.15% of Zr, Ti+Zr not more than 0.15%, single impurity not more than 0.05%, total impurity not more than 0.15%, and the balance of Al. The machining method for the aluminum alloy thick plates adopts a mode of multi-pass hot rolling, and adopts double-stage solid solution and double-stage aging to enable the finally prepared 7-series aluminum alloy thick plates to achieve excellent strength and rupture toughness.

The invention discloses a loudspeaker diaphragm and a loudspeaker. The diaphragm comprises a thermoplastic polyester elastomer film layer, wherein the thermoplastic polyester elastomer is a copolymerformed by a polyester hard segment A and a polyether or aliphatic polyester soft segment B, wherein the mass percent of the polyester hard segment A is 10%-95%. The loudspeaker diaphragm is high in structural strength, difficult to damage, good in toughness resilience performance and good in sound production effect.

The invention discloses a preparation method for a graphene rare earth aluminum alloy high-conductive material. The method comprises the following steps: adding aluminum scrap, silicon calcium alloy, copper aluminum alloy, zinc aluminum alloy, magnesium ingot, rare earth aluminum alloy and graphene into a smelting furnace for smelting; performing ladle analysis, thereby acquiring an aluminum alloy solution; casting and rolling the aluminum alloy solution, thereby acquiring aluminum alloy; performing homogenization treatment on the aluminum alloy; performing ageing treatment, thereby acquiring the graphene rare earth aluminum alloy high-conductive material. According to the preparation method for the graphene rare earth aluminum alloy high-conductive material, provided by the invention, the technical parameters are reasonably set, the graphene structure is optimized and the overall performance of the aluminum alloy is effectively improved, so that the acquired graphene rare earth aluminum alloy high-conductive material has excellent electric conductivity, heat resistance, arc altitude resistance and mechanical properties.