397results about How to "Good toughness" patented technology

Nano-silver-containing sodium alginate based antibacterial medical dressing and preparation method thereof

ActiveCN103446621AGood toughnessHemostasis Wound HealingAbsorbent padsBandagesChemistryInterpenetrating polymer network
The invention provides a preparation method of a nano-silver-containing sodium alginate based antibacterial medical dressing, and relates to an antibacterial medical dressing with sodium alginate as a main raw material, solving the problems that the air permeability is poor, the wettability is low, the antibacterial performance is not realized and the like in the existing dressing and a preparation method thereof. The medical dressing provided by the invention is composed of silver nanoparticles, sodium alginate and an interpenetrating polymer network film. The preparation method provided by the invention comprises the following steps: I, preparing nano-silver loaded sol; II, preparing a sodium alginate solution loaded with silver nanoparticles; III, preparing a crosslinked polymer solution; IV, preparing a mixing solution used for processing the dressing; V, preliminarily processing and forming the dressing; and VI, preparing the nano-silver-containing sodium alginate based antibacterial medical dressing. The dressing is able to quickly control major bleeding, has antibacterial performance, is outstanding in moisture absorption performance, high in moisture-vapor transmission and biocompatibility, and biodegradable, has the capacity of promoting wound healing and is low in price, simple and convenient to operate, and suitable for mass production.

Balloon catheter and manufacturing method thereof

ActiveCN103055411AGood toughnessGood fitSurgeryDilatorsNickel titaniumLesion
The invention discloses a balloon catheter and a manufacturing method thereof and aims to improve pushing capability and permeability of the balloon catheter, lower damage to blood vessels, and increase utilization rate of the balloon catheter. A balloon passes through a far-end outer catheter body and a near-end catheter body to a needle seat to form a pressure cavity. A far end of the balloon is connected with a catheter tip. The far-end outer catheter body is made of nylon or nylon elastomer. The near-end catheter body is made of stainless steel or nickel-titanium memory alloy. An inner catheter is arranged in the pressure cavity. A far end of the inner catheter is connected with the catheter tip. A near end of the inner catheter is a fast switching port for a guide wire. The manufacturing method includes obtaining parts and assembling. Compared with the prior art, by the catheter tip, the far end of the balloon catheter is good in tenacity and in good fit with the guide wire. During treating complex lesion such as curve blood vessels with lesion and chronic fully closed blood vessels with lesion, permeating capability of the balloon catheter through the blood vessels with lesion is high, the blood vessels with lesion can be expanded fully, blood vessel damage which can be caused easily can be reduced, and operation cost is lowered.

Flux-cored wire for titanium-steel composite board dissimilar joint transition layer and manufacturing method of flux-cored wire

A flux-cored wire for a titanium-steel composite board dissimilar joint transition layer comprises a welding wire skin and a flux core; the skin is a copper strip with the purity of 99.99 percent; the flux core is made of vanadium powder; chemical components of the flux core comprise more than 99.9% of V, less than 0.05% of Fe, less than 0.05% of Si, less than 0.05% of Al, less than 0.04% of N, less than 0.05% of C, and less than 0.01% of H; and the sum of the mass percents of the chemical components is 100 percent. The invention further discloses a manufacturing method of the flux-cored wire. The method comprises the steps that the copper strip processed in the step 2 is rolled into a U shape through a forming machine, the vanadium powder dried in the step 1 is added into the copper strip and the filling rate of the vanadium powder is controlled in the range of 25 percent to 30 percent; then, six-level rough drawing is carried out on a welding wire until the diameter of the wire is 2.6 mm; and nine-level fine drawing is carried out on the welding wire until the diameter of the wire is 1.2 mm. The flux-cored wire can achieve fusion welding abut joint of a titanium-steel composite board; an obtained welding joint has the excellent toughness; the components can be easily controlled; a manufacturing technology is simple; and large-scale mass production can be conveniently carried out.

Preparation method of reinforced carbon-based composite material of carbon foam preform

A preparation method of reinforced carbon-based composite material of carbon foam preform includes the following steps: (1) stirring phenolic resin, surfactant, foaming agent and curing agent according to the mixture rate, namely the mass percent of 100:5:5:25, then adding chopped carbon fiber accounting for 3-15wt.% of the total weight to be mixed with the materials, and after uniform dispersion,putting the mixture in a baking oven that is preheated to 80-100 DEG C to be heated, foamed and solidified, thus obtaining phenolic foam with reinforced carbon fiber; (2) putting the phenolic foam with reinforced carbon fiber obtained in step (1) in a vacuum carbonization furnace, heating the phenolic foam to the temperature of 900-1, 000 DEG C at the heating rate of 10-20 DEG C/h under 1-2Pa lowvacuum and preserving the heat for 2-3h to obtain the carbon foam preform with reinforced carbon fiber; (3) under the temperature of 1, 000-1050 DEG C and the deposition pressure of 0.5-5kPa, takingnatural gas as a carbon source and nitrogen as carrier gas and adopting CVI technology to conduct compaction for 400-600h; and (4) conducting heat treatment on the material at the high temperature of2, 000-2, 300 for 3-5h after compaction treatment. The material has the advantages of light weight, high strength, low cost, corrosion resistance, resistance to wear, low coefficient of thermal expansion, etc.

Plugging agent for drilling fluid and protecting low percolation reservoir

The invention discloses a plugging agent for a drilling fluid and protecting a low percolation reservoir, comprising the following components of: 10-40 parts of acid-soluble fiber, 5-10 parts of oil-soluble resin, 30-60 parts of acid-soluble deformed particles, 5-10 parts of high-temperature resistant natural small molecule materials and 10-15 parts of calcium carbonate. The basic component of the plugging agent is the acid-soluble fiber which is swelled and soft, has good tenacity and can expand by adsorbing partial moisture, and the like in the drilling fluid to form a meshy structure so as to form plugging on a hole throat under the action of flowing pressure. In addition, other components in the plugging agent, such as the deformed particles, the natural small molecule materials and the calcium carbonate can combine with the fiber to play a rapid plugging role, and therefore, the plugging agent has low damage depth on the reservoir. The plugging agent can be matched with the radius of the hole throat of the low percolation reservoir according to the regulation on the radius of the hole throat of a low percolation core. A drilling fluid system using the plugging agent as the main plugging material has the dynamic core filtration rate not more than 0.1ml/10min at high temperature and high pressure.

High-toughness high-activity epoxy resin curing agent and preparation method thereof

ActiveCN103333323AGood toughnessGood impact strengthIsocyanateKetone
The invention discloses a high-toughness high-activity epoxy resin curing agent and a preparation method of the curing agent. The method comprises the following steps of: weighing cyclic carbonate and polyamine according to the condition that the molar ratio of the cyclic carbonate to the polyamine is (0.1-1):1, feeding the cyclic carbonate into a reactor filled with the polyamine in batches for reaction, weighing thiourea, the molar weight of which is 0.5-2.5 times that of the polyamine, feeding the thiourea into the reactor in batches, reducing the temperature of the system to 80 DEG C after the reaction is finished, adding an accelerant, the mass of which is 0.5-5% of the total mass of the products, into the products, uniformly mixing the accelerant and the products, discharging the mixture and storing the mixture. The curing agent prepared by using the preparation method disclosed by the invention is different from a traditional curing agent in that: the curing agent comprises a polyurethane flexible chain segment synthesized from nonisocyanate, and is excellent in toughness and good in impact resistance; a molecule of the curing agent comprises the polyamine of a thiourea link, which exists in a balanced state with a ketone form and an enol form; the enol compound can rapidly react with an epoxy group so that the epoxy resin can be completely cured in winter and a construction period is effectively shortened.

High-toughness, wear-resistant, self-lubricating polyamide material and preparation thereof

The invention discloses a polyamide material with high tenacity, wear-resisting capacity and self-lubricating property and a method for preparing the same. The compositions by weight percentage of the polyamide material are: 65 to 80 percent of polyhexamethylene adipamide, 15 to 23 percent of wear-resistant agent, 0 to 0.5 percent of lubricating agent, 0 to 3 percent of coupling agent, 0 to 0.5 percent of antioxidant, and 5 to 10 percent of toughener. The method improves wear-resisting property and self-lubricating property of the product mainly through auxiliary materials, thereby enlarging the application range of polyamide modified engineering plastics. The product of the invention has the advantages of good toughness, high impact strength, good surface glossiness, excellent chemical resistance and good dimension stability; a part of wear-resisting agent is added in the polyamide material, so the wear-resisting property of the material can be greatly improved; because the application range of the polyamide material is enlarged, wear-resisting requirements of partial transmission parts, shuttle wear parts and anti-sand-scraping parts can be met; and the polyamide material can be widely used for transmission components of an engine, an outer housing of a roller, an outer housing of an engine, a mechanical socket connector and transmission accessories, and can be used in positions which are often contacted and abraded in other transmission devices.
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