85results about How to "Improve anti-collapse performance" patented technology

A catheter having an elongated shaft formed of a polymeric tubular member with at least a section having a lubricious inner layer defining the guidewire lumen, a coiled support member at least partially embedded in the lubricious inner layer, and an outer layer on an outer surface of at least a distal portion of the lubricious inner layer. In a presently preferred embodiment, the coil supported polymeric tubular member forms an inner tubular member of a balloon catheter.

The invention discloses copper welding paste for braze welding, a preparation method of the copper welding paste for braze welding and the application of the copper welding paste for braze welding. The copper welding paste for braze welding comprises 67wt%-92wt% of brazing filler metal, 8wt%-33wt% of pasty fluid and brazing flux of which the mass is 0-5% that of the brazing filler metal, wherein the brazing filler metal comprises Cu and/or one or more types of Cu alloy, the brazing flux comprises any one or more than two components of CaF2, KF, NaF, BaF2, sebacic acid, succinic acid, lauric acid and boric acid, and the pasty fluid comprises a solvent, a thickening agent, a rheological agent, an antifoaming agent and an activating agent. When the copper welding paste prepared through the method is applied before braze welding, the copper welding paste has good thixotropy, collapse resistance and fluidity; after braze welding, a part has high joint strength, a weld joint is plump and free of residues, and the part does not need cleaning; the copper welding paste can be widely applied to welding automobile pipe fittings, copper-based heat dissipation assemblies and stainless steel parts.

The invention belongs to the field of bone damage repair medicinal materials and particularly relates to a preparation method and application of bone cement containing calcium citrate. The bone cement containing calcium citrate is composed of a solid phase part and a liquid phase part, the solid phase part is formed by compounding the calcium citrate and calcium phosphate salt, and the mass ratio of the calcium citrate to the calcium phosphate salt is (2-5):1; the liquid-solid ratio is (0.5-1.5):1. The bone cement containing the calcium citrate has comprehensive biomedical properties such as good plasticity, bone guidance, bone induction activity, cell activity and good degradation rate and is applicable to the orthopedics department, the thoracic surgery department and shaping and restoration of skull and jaw surfaces.

The invention discloses a rubber tire tread and a milling process thereof. The rubber tire tread comprises the following components in parts by weight: 70-110 parts of natural rubber, 0-15 parts of styrene-butadiene rubber, 5-20 parts of tread rubber powder, 1.5-2.5 parts of stearic acid, 1-2 parts of sulfur powder, 2-18 parts of white carbon black, 12-15 parts of carbon block, 2-30 parts of aromatic oil, 1-8 parts of zinc oxide, 4-7 parts of an anti-aging agent, 1-4 parts of pine tar, 1-4 parts of an accelerating agent, 0.2-1 part of an anti-reversion agent and 2-5 parts of a binding agent. A three-section milling process is adopted, and the milling process can improve the abrasive resistance, tear resistance and chunking and chipping resistance of the tire tread.

The invention discloses a rare-earth-containing high-strength high-toughness seamless steel tube for shale gas. The seamless steel tube is prepared from, by mass, 0.23%-0.27% of C, 0.17%-0.37% of Si,0.45%-0.65% of Mn, 0.8%-1.2% of Cr, 0.60%-0.80% of Mo, 0.06%-0.10% of V, 0.01%-0.04% of Al, less than or equal to 0.015% of P, less than or equal to 0.005% of S and 0.006-0.010% of RE. The invention discloses a preparation method. According to the rare-earth-containing high-strength high-toughness seamless steel tube for shale gas, rare earth elements are added into the Cr-Mo series steel, the modification and microalloying of the rare earth elements not only makes the steel have high strength and crush resistance but also has high toughness, especially high transverse impact toughness, and the seamless steel tube can meet the working condition requirements of shale gas exploitation and has good popularization value.

The invention provides a 125 ksi high-strength and high-toughness petroleum casing pipe for exploring thickened oil through the SAGD method and a manufacturing method thereof. The casing pipe comprises, by weight, 0.23-0.28% of C, 0.17-0.30% of Si, 0.56-0.75% of Mn, smaller than or equal to 0.015% of P, smaller than or equal to 0.007% of S, smaller than or equal to 0.20% of Ni, 1.0-1.20% of Cr, 0.35-0.55% of Mo, smaller than or equal to 0.15% of Cu, smaller than or equal to 0.01-0.04% of Al and the balance Fe. The manufacturing method includes the steps of selecting raw steel-making materials; adjusting steel compositions through external refining, vacuum degassing and argon stirring; lowering the out-of-roundness of the outer diameter and the unevenness of the wall thickness of a steel pipe by carrying out high-precision rolling through a PQF unit; and carrying out heat treatment to obtain high-strength and high-toughness matching and lowering the residual stress of the steel pipe by increasing the thermal straightening temperature and through the stress relief annealing technology. The casing pipe and the manufacturing method thereof have the beneficial effects that the heat stability is good, the yield strength is not lower than 800 MPa at 350 DEG C, the external extrusion deformation resistance is high, the actual anti-collapse property is higher than the API calculation value by more than 56%, and the requirements of exploring the thickened oil through the SAGD method are met.

The invention provides sponge foaming rubber for a car door sealing strip and a preparation method thereof, a car door sealing strip and a preparation method thereof. The sponge foaming rubber for the car door sealing strip, provided by the invention, is prepared from the following components in parts by weight: 20 to 40 parts of ethylene-propylene-diene monomer 9090M, 69 to 92 parts of ethylene-propylene-diene monomer V8800, 5 to 7 parts of active zinc oxide, 1 to 2 parts of stearic acid, 1 to 3 parts of a dispersant, 0.8 to 1.4 parts of erucamide, 1 to 2 parts of PEG-4000 (Polyethylene Glycol-4000), 5 to 10 parts of POE (Polyolefin Elastomer), 60 to 77 parts of paraffin oil R-2291, 30 to 50 parts of carbon black N550, 50 to 70 parts of carbon black SP5000, 1.5 to 2.5 parts of sulfur S-80, 6 to 10 parts of a moisture absorbent GR, 3 to 6.4 parts of an accelerant, 3 to 3.6 parts of a foaming agent OBSH-75 (Oxydibenzenesulfonyl Hydrazide-75) and 1.1 to 1.5 parts of a foaming agent AC3000-75. By adopting a formula of the sponge foaming rubber for the car door sealing strip, provided by the invention, the prepared sponge rubber has relatively low density and can meet a lightweight design; meanwhile, the obtained rubber also can have relatively good physical performance, so that the utilization quality of the car door sealing strip utilizing the sponge foaming rubber can also be improved.

The invention discloses compound bone cement, a preparation method and application of the compound bone cement, and a bone repair material. The compound bone cement is prepared by mixing the followingraw materials in percentage by mass: 50-80% of solid phase powder and 20-50% of setting liquid, wherein the solid phase powder comprises phosphate and/or acidic salt of phosphoric acid; the setting liquid comprises chitosan, hyaluronic acid, organic acids and water. The compound bone cement has excellent syringeability, biological activity and bone conduction and repair ability, the set bond repair material has an excellent mechanical property, the surface of the material is easy for cell adhesion, and the cell differentiation ability cannot be influenced. The compound bone cement disclosed by the invention can be used for bone defect filling and repairing and serves as a drug carrier to be used for treating orthopedic related diseases.

The invention relates to an injectable bone cement and preparation method thereof. The injectable bone cement comprises powder and curing liquid, wherein the powder is composited of calcium sulfate hemihydrate and polyethylene glycol diacrylate, and the curing liquid is sulfhydrylated hyaluronic acid aqueous solution or sulfhydrylated chitosan aqueous solution. The preparation method comprises the following steps of: preparing the powder of calcium sulfate hemihydrate and polyethylene glycol diacrylate inproportion; adding the curing liquid according to the liquid-to-solid ratio of 0.4-1.0mL/g, mixing and stirring evenly, and curing at room temperature to form the injectable bone cement. Sulfhydrylated hyaluronic acid and sulfhydrylated chitosan are liable to form intramolecular and intermolecular disulfide bonds under neutral condition and have higher degree of crosslinking and viscoelasticity; thus, injectable property, collapse resistance and mechanical property of the bone cement are improved. Meanwhile, the bone cement provided by the invention also has good biocompatibility and biodegradablity, and can be used for filling and repair for various bone defects. The injectable bone cement and the preparation method thereof are used in the field of tissue engineering and medicine.

The invention discloses anti-scratching highlight RC printing paper and a preparation method thereof. The preparation method comprises the steps that highlight RC paper is coated with an ink absorption layer coating, and pre-coating RC printing paper is obtained after drying is performed; then, the pre-coating RC printing paper continues to be coated with an anti-scratch glossy layer coating, andthe anti-scratching highlight RC printing paper is obtained after drying; the ink absorption layer comprises nanometer aluminum oxide, an adhesive, a pH regulator, a silane coupling agent, a defoamingagent, a flatting agent and a cross-linking agent; the anti-scratch glossy layer comprises micro transparent powder, nanometer aluminum oxide, an adhesive, a pH regulator, a silane coupling agent, adye fixing agent, a flatting agent and a cross-linking agent. According to the anti-scratching highlight RC printing paper, the glossiness is higher than 50%, the surface hardness reaches up to 4H tothe minimum, the excellent scratch resistance is achieved, and the high glossiness and the imaging effect close to traditional photos are achieved.

The invention discloses a calcium phosphate-based composite microsphere support and a preparation method thereof. The preparation method comprises the following steps of dissolving polyglycollide-lactide in dichloromethane to obtain a polyglycollide-lactide solution; dispersing crystallized calcium phosphate and anhydrous calcium hydrogen phosphate in the polyglycollide-lactide solution to obtain a solution 1; adding Tween-80 to liquid wax to obtain a solution 2: adding the solution 1 to the solution 2 under a stirring state to obtain composite microspheres; pouring the composite microspheres into a mold, adding deionized water, conserving in a constant temperature and humidity chamber after demolding; immersing in cold acetone and freeze drying to obtain the calcium phosphate-based composite microsphere support. The prepared microsphere support has a three-dimensional through pore structure with moderate pore size, and has good mechanical properties and good biocompatibility. The pore size of the support is further enlarged after polyglycollide-lactide is degraded, thereby facilitating the formation of new bones. Besides, the preparation process is simple; raw materials are easily available; cost is low and industrialized production can be easily realized.

The invention relates to a brushite bone cement preparation method, which belongs to the technical field of a pavement maintenance material. The method takes silk fibroin as a medical carrier, mutualentanglement is realized through a silk fibroin molecular chain, a three-dimensional network is formed, hydroxyapatite is deposited at a network skeleton, so that the scatter-resistant performance ofthe calcium phosphate bone cement is increased, silk fibroin can control medicine release through chemical bond combination and coating modes, the common medicine burst release effect is effectively controlled, during bone tissue restoration and treatment, the local medicine concentration of a treatment dosage is kept, the pharmaceutical effect of the biomaterial is prolonged, the curative effectof lidocaine for alleviating ache can be effectively performed for a long time in human body, a silk fibroin high molecular chain network is taken to provide a hydroxyapatite deposited template, through complexation effect on calcium ions, a solidification reaction is delayed, the effect for prolonging the solidification time is achieved, brushite is taken as flaky crystal, the accumulation is tight, and compressive strength is increased.

The invention discloses a transparent primer dipped with unsaturated polyester. The transparent primer is composed of the following components at a weight ratio: primary paint: a diluent: an initiator: an accelerator=100:150:(1-2):(1.2-2.5); the primary paint is composed of the following components: 70-80% of unsaturated polyester resin, 5% of epoxy acrylic resin, 0.3-0.5% of a defoamer, 0.3-0.5% of a dispersant, 0.5-0.8% of an anti-settling agent, 0.2-0.4% of a flatting agent, 0.1-0.3% of a polymerization inhibitor, 4-6% of a polishing agent and 7-18% of an active solvent. The unsaturated polyester resin is allyl ether modified unsaturated polyester resin, the solid content of which is 72-78% and the viscosity of which is 2000-3000mpa.s; the active solvent is a mixture of styrene and a polyester transparent primer; and the diluent is composed of acetic ether, styrene, methylbenzene and acetone. The transparent primer dipped with unsaturated polyester disclosed by the invention has relatively good defoaming property and sag prevention, and is strong in seepage force, excellent in fillibility, and the sealing effect is obviously superior to that of a PU sealing primer in the market, so that the problem that the film collapses is effectively solved. The transparent primer for firstly dipping woodware is labor-saving and material-saving, energy-saving and environment-friendly, high in construction efficiency and suitable for flow line production.

The invention provides a method for manufacturing an improved vehicle radiator aluminum alloy foil material, which contains the following components by weight: 0.03-0.30% of iron, 0.26-1.54% of silicon, 0-0.15% of copper, 1.3-2.8% of manganese, 1.4-1.8% of zinc, 0.10-0.25% of zirconium, 0.01-0.03% of titanium, and the balance aluminum.

The invention discloses a production process for an ethylene propylene diene monomer microporous base plate. The production process comprises the following steps: adding ethylene propylene diene monomer into a kneading machine to knead, and then adding zinc oxide, stearic acid, carbon black, a moisture absorbent, an acid and alkali regulator, a softening agent and an inorganic filler into the kneading machine to knead, thereby preparing a master batch; adding the prepared master batch into an open mixing machine, adding a vulcanizing agent, a promoter, a foaming agent and a foaming aid, uniformly mixing, regulating roll spacing to 0.8-1.3 millimeters for thin-passing, carrying out triangular packaging for 3-4 times, regulating the roll spacing to 5-6 millimeters for discharging, so as to prepare a rubber compound, and standing the rubber compound for not smaller than 16 hours; putting the rubber compound on a cutter for cutting; feeding prepared rubber strips into a cold feeding extruder to extrude; sequentially feeding the prepared rubber strips into a high-temperature section, a microwave section and an oven section to carry out continuous vulcanizing until complete vulcanizing; and pulling the prepared vulcanized rubber into the cutter through a pulling machine, and cutting the prepared vulcanized rubber into a needed dimension, thereby obtaining a microporous base plate finished product. The invention further provides an ethylene propylene diene monomer microporous base plate.

A method to improve the collapse resistance of metallic tubular products is disclosed. The method comprises identifying the types of stress that can be applied in order to change the residual stress profile of metallic tubular products, such as those that have completed a straightening process, and results in a residual stress profile that improves collapse resistance. The metallic tubular product is subjected to radial compression processing to control the residual stress profile and to enhance collapse resistance. The radial compression process may be used after the tubular product has been subjected to a straightening process.

The invention provides a processing box. The processing box comprises a shell, a develop roller and a first sealing part. A cavity for containing supplies is defined by the shell, a supply outlet is formed in one end of the cavity, the develop roller is installed at the position, close to the supply outlet, inside the cavity and the first sealing part is installed below the develop roller and fixed onto the supply outlet. The processing box further comprises a sealing doctor blade, the sealing doctor blade comprises a fixed portion and a contacting portion, the fixed portion is fixed onto the supply outlet, the contacting portion comprises a first end portion and a contacting end face, the first end portion is connected with the first sealing part in abutting mode, and the contacting end face is elastically connected with the develop roller in an abutting mode. According to the processing box, the sealing doctor blade makes elastic contact with the develop roller, so that the sealing doctor blade is not prone to deforming, and improvement of the sealing performance and the durability of the processing box is facilitated.

The invention discloses a preparation process of an anti-CO2-corrosion oil well pipe with a steel grade of less than 150ksi produced by a CPE unit. The process comprises the following steps: smelting each component by virtue of a converter according to the mass percentage proportion of each component, and performing continuous casting and continuous rolling on molten steel which is smelted by the converter to prepare a pipe billet, wherein the pipe billet comprises the following components in percentage by mass: 0.13-0.23% of C, 0.11-0.41% of Si, 0.8-1.0% of Mn, 5.0-6.0% of Cr, 0.05-0.45% of Mo, 0.02-0.04% of Al and the balance of Fe and inevitable impurities, and the total mass percentages are 100%. A steel pipe rolled by virtue of the process disclosed by the invention is good in surface quality and high in size precision, the anti-collapse performance of a pipe body can be effectively improved, the improvement of the anti-CO2-corrosion performance of the steel pipe can also be facilitated, the mechanical performance of the steel pipe can reach less than 150ksi, and the steel pipe is suitable for mining application of deep wells and ultra deep wells.

The invention discloses high-strength injectable magnesium phosphate bone cement and a preparation method thereof. The high-strength injectable magnesium phosphate bone cement comprises solid-phase powder and curing liquid, wherein the ratio of the solid-phase powder to the curing liquid is (1.5-3.5) g: 1mL; the solid-phase powder comprises the following components in parts by weight: 50-90 parts of magnesium phosphate salt and 10-50 parts of hydrophosphate, wherein the magnesium phosphate salt comprises trimagnesium phosphate, and the hydrophosphate salt comprises monopotassium phosphate; and the curing liquid is an aqueous solution. The solid-phase powder and the curing liquid are directly mixed to prepare the high-strength injectable magnesium phosphate bone cement. The bone cement has high compressive strength, good injectability and collapse resistance, can prolong the curing time and reduce heat release in the reaction process, and is suitable for being applied to the fields of osteoporosis vertebral compression fracture, spinal fusion and bone repair of other bearing parts.

The invention relates to the technical field of tires, in particular to a rubber wear-resisting tire tread. The rubber wear-resisting tire tread is characterized by being prepared from the following raw materials in parts by weight: 26-30 parts of butadiene rubber, 26-30 parts of natural rubber, 5-7 parts of organic fiber, 4-5 parts of zinc oxide, 10-12 parts of carbon black, 4-5 parts of silicon dioxide, 2-3 parts of isoprene, 2-3 parts of microcrystalline wax, 3-5 parts of a plasticizer and 1-2 parts of sulphur. According to the rubber wear-resisting tire tread, the early groove crack of a tread groove can be effectively prevented; the abrasive resistance, the tear resistance and the anti-cracking and anti-dropping properties of the tire tread are improved; and the service cycle of the tire is prolonged.