666results 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 discloses a manufacturing process of phi 300 mm-phi 700 mm high-carbon high-chromium cold-working die steel forged round steel, and the purpose is to solve the problems of quite severe ununiformity of large-section forging material eutectic carbides and the increase of defects of internal cracks and surface cracks during the forging process caused by segregation deterioration of cast structure carbides of large steel ingots. By using steel-making technical measures such as LF refining, VD degassing, aluminium wire feeding, and the like, the invention improves the molten steel cleanliness, the control of electroslag remelting output power, and the homogenization treatment before forging, and improves the segregation of eutectic carbides and the hot-working plasticity of steel; by controlling the forging heating numbers and various deformation amounts of large high-carbon high-chromium steel ingots, large granular carbides are crushed; the ununiformity of eutectic carbides is improved; crack defects during the forging process are prevented; and the produced high-carbon high-chromium steel large-section forging materials has ununiformity of eutectic carbides of up to grade 4-grade 6; the results of ultrasonic inspection are at good levels of E/e grade, D/d grade.

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 TiAl-intermetallic-compound vacuum diffusing connection method, belonging to the TiAl-intermetallic-compound welding field, which overcomes the technical drawbacks of high temperature of diffusing connection and high pressure of diffusing connection in the prior TiAl-intermetallic-compound diffusing connection technology. The invention adopts hydrogenated titanium or titanium alloy chaff as the interface layer of diffusing connection. Ti3Al+TiAl dual phase (Alpha2+Gamma) organ can be formed under the temperature of diffusing connection titanium, which facilitates the formation of high-intensity connector lug of TiAl-intermetallic-compound diffusing connection. And hydrogen makes the flow stress of thermal deformation of titanium or titanium alloy decrease and the thermal plasticity increase, so that hydrogenated titanium or titanium alloy is prone to deform under high temperature. Meanwhile,, the self-diffusing capacity of hydrogen in titanium or titanium alloy and the diffusing capacity of solute are enhanced, more particularly, in Beta phase the capacities are more enhanced, so that hydrogen can accelerate the diffusing of the alloy elements, reduce the atomic combination energy and the diffusing activation energy, promote the diffusing coordinated deformation capacity, and the reliable diffusing connection of connector lug of TiAl-intermetallic-compound can be realized under comparatively low temperature.

The invention relates to vinyl for manufacturing a toy. The vinyl for manufacturing a toy is prepared from the following raw materials in percentage by weight: phthalate, dioctyl phthalate, dibasic lead stearate, PVC (polyvinyl chloride) paste resin, PVC coarse powder, PVC medium powder, talcum powder, PVC hard oil, plasticizer TXIB, acetyl-tri-n-butyl citrate, vanillin, amyl acetate, geranyl butyrate and maltol. The vinyl has good hardness, smooth handfeel, strong plasticity, high re-shaping ability and high stability, and does not deform easily after multiple extrusions; and meanwhile, the vinyl is non-toxic and harmless and has fresh fruit aroma.

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 starch-based composite and a preparation method thereof. The composite is formed by, by weight, 100 parts of modified starch and 10-100 parts of polyester through melt blending. The structural formula of the modified starch is showed in the description and claims, wherein St refers to starch molecules and R group is alkyl group (CnH2n+1). Esterified starch comprises, by weight, 100 parts of natural starch, 0-200 parts of solvent, 10-50 parts of catalyst and 1-50 parts of modifier. The preparation method includes melt blending the components according to the weight to obtain the starch-based composite. The preparation method is high in efficiency, low in cost, simple in process, controllable in performance, and suitable for preparing thermoplastic materials with various performance requirements.

The invention discloses a loudspeaker diaphragm and a loudspeaker. The loudspeaker diaphragm comprises two composited surface layers and at least one intermediate layer located between the two surfacelayers, at least one of the surface layer is a thermoplastic polyester elastomer film layer and at least one of the intermediate layers is an adhesive layer, wherein the plastic polyester elastomer is a copolymer composed of a polyester hard segment A and a polyether or aliphatic polyester soft segment B, and the mass percentage of the polyester hard segment A is 10-95%. The loudspeaker diaphragmhas excellent stiffness, good damping performance, resilience and so on.

The invention relates to a 3D printing aromatic polyester material comprising the following components in parts by weight: 60-90 parts of aromatic polyester, 10-25 parts of polycarbonate, 2-10 parts of a thermoplastic elastomer, 1-5 parts of a compatibilizer, 0.1-5 parts of a sensitizing agent, and 0.1-1 part of an antioxidant. The aromatic polycarbonate and the aromatic polyester are utilized for co-mixing modification so as to improve the shock resistance, and after the co-mixed material is drawn into thin strips, the thin strips are subjected to a certain extent of crosslinking by irradiation with a certain dose of electron beams, so that a purpose of noumenon enhancement is achieved, at the same time, good fusion processability is maintained, and the aromatic polyester is allowed to have a wider application prospect in 3D printing materials.

The invention discloses a loudspeaker diaphragm and a loudspeaker. The diaphragm includes two surface layers that are compounded together and at least one intermediate layer located between the two surface layers, wherein at least one of the surface layers is a thermoplastic polyester elastomer film layer, at least one of the intermediate layers is an adhesive layer, a thermoplastic polyester elastomer is a copolymer composed of a polyester hard segment A and a polyether or aliphatic polyester soft segment B, the thickness of the thermoplastic polyester elastomer film layer is 5-70 microns, and the thickness of the adhesive layer is 1-40 microns.

The invention discloses a two-component PU (polyurethane) coating. Firstly, castor oil is used for cross-linking prepolymers: a multifunctional group structure in the castor oil can cross-link the polymers to a certain extent, the cross-linking degree of the polymers is increased, so that the interaction force among molecular chains is increased, motion of the molecular chains is hindered, water molecules can hardly enter the molecular chains to enable the polymers to swell, and the water absorption of a film is reduced; meanwhile, the castor oil is a triglyceride of fatty acid, the film has the good hydrophobicity due to long nonpolar fatty acid chains in molecules of the castor oil, and the water absorption is further reduced; besides, ester groups in the castor oil have higher cohesive energy, so that the tensile strength of the film can be enhanced; ethyl cellulose has better heat resistance and thermoplasticity, has good compatibility with PU and can improve the comprehensive performance of the prepolymers; then blending modification is performed on the PU prepolymers and polysilsesquioxane.

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 loudspeaker diaphragm and a loudspeaker. The loudspeaker diaphragm comprises two surface layers compounded together and at least one intermediate layer located between the two surface layers. At least one surface layer is a thermoplastic polyester elastomer film layer; and the at least one intermediate layer is an adhesive layer. The Young's modulus of the thermoplastic polyester elastomer film layer is 1-1000MPa; the loss factor thereof is larger than or equal to 0.015; and the elastic recovery rate thereof is greater than or equal to 80% after 10% of strain.

The invention discloses a pet masticatory containing a nutrition bar and consists of a nutrition bar and a livestock skin which enwinds the nutrition bar. The pet masticatory comprises by weight percentage: 20-80 percent of livestock skin selected from pigskin, cowskin or sheepskin, 10-60 percent of protein nutrition bar which is the mixture of animal protein and vegetable protein, 5-50 percent of starch, 1-10 percent of grease, 1-8 percent of dietary fiber, 1-4 percent of quality modifying agent and flavoring agent, 0.1-5 percent of antioxidant, 0.1-3 percent of nutrient or healthy additive and the rest of water. At the same time, the invention also discloses a preparation method for the product.

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.

The invention relates to a compound extrusion preparation method of a large-diameter high-quality tube blank or an annular blank. The compound extrusion preparation method is mainly aimed at materials which are large in deformation resistance, narrow in heat processing temperature range, difficult in heat processing, and difficult to deform. The compound extrusion preparation method comprises the following steps: (1) a high-quality ingot blank with high purity is prepared through a vacuum melting process; (2) homogenization treatment is carried out alternatively, multi-pass pier drawing fast forging cogging-down is carried out, an organization is refined, and the homogeneity of the organization is improved; (3) hollow blank material is prefabricated in a punch mode; (4) isothermality/heat molding compound extrusion is carried out on the prefabricated hollow blank material, the tube blank with the uniform and thin organization is prepared; and (5) subsequent machining is carried out, and a finished tube (ring) and the high-quality ingot blank are obtained. The novel preparation method is used for preparing the large-diameter tube (ring) blank with the uniform and thin organization. The preparation method is labor-saving in shaping, energy-saving, high in material utilization rate, high in product quality, and capable of resolving the problems that a tube (ring) blank prepared through a traditional process is thick in organization, poor in uniformity, large in shaping force and the like.

The invention discloses a thermoplastic cellulose-based solid-solid phase transition material and a preparation method thereof. The preparation method comprises the following steps: 1, drying cellulose or a cellulose derivative; 2, respectively dissolving a cross-linking agent and polyethylene glycol alkyl ether in an organic solvent I to obtain a cross-linking agent solution and a polyethylene glycol alkyl ether solution, adding the polyethylene glycol alkyl ether to the cross-linking agent solution in a dropwise manner, adding a catalyst, and reacting for 0.5-10h to obtain a prepolymer solution, wherein a mole ratio of the polyethylene glycol alkyl ether to the cross-linking agent is 1:1; and 3, dissolving cellulose in an ionic liquid to obtain a cellulose solution, adding the prepolymer solution, acid anhydride and a catalyst to the above obtained cellulose solution, carrying out a polymerization reaction for 2-24h to obtain a finally obtained mixture, adding the finally obtained mixture to deionized water or an organic solvent II for precipitation, repeatedly washing the above obtained precipitate with deionized water 2-3 times, and carrying out vacuum drying to obtain the thermoplastic cellulose-based solid-solid phase transition material. The phase transition material has a good thermal stability and a melting processing performance, and can be blended with a thermoplastic copolymer matrix for melting processing.