58results about How to "Easy to adjust performance" patented technology

The invention belongs to sea deep water complex well cementing which is suitable for low temperature, tending to superficial water-gassed-out. The mineral components and mass percent composition are: 23-45 wt.% of tricalcium silicate, 12-25 wt.% of calcium sulphoaluminate, 15-23 wt.% of dicalcium silicate, 3-10 wt.% of gypsum, 4-8 wt.% of calcium carbonate, and residual celite, calcium aluminate and other microelement. The using process of the deep water complex well cementing includes: adding 0-3 wt.% of coagulant, 0-1.2 wt.% of retarder, 15-45 wt.% of hollow microglobin and water to prepare a low density cement slurry system of 1.35-1.60g/cm3 which has a controllable gelled time and has a perfect right-angle gelling capacity, a set cement volume microdilatancy and develops fast at low temperature. The inventive deep water low temperature complex well cementing has a high early strength, a short curing time, a powerful channeling-preventing ability, and microdilatancy, which provides a powerful guarantee to improve the deep water complex well quality.

The invention discloses a multi-glycol epoxy derivative cross-linked sodium hyaluronate gel used for injection and a preparation method thereof. The multi-glycol epoxy derivative is preferably a compound with a single molecular weight, multiple ether bonds exist in the molecule, the compound is good in water solubility and can generate cross-linking reaction with polysaccharide more easily, and because the quantity of multi-glycol repeating units is easy to adjust and the length is relatively easy to control, the performance of sodium hyaluronate gel prepared as a cross-linking agent is relatively easy to regulate; and the cross-linked sodium hyaluronate gel is low in toxicity, less in residue, weak in extruding thrust, good in moulding property, good in enzyme resistance and long in retaining time in the body. The invention further discloses a mild cross-linking agent inactivation technology, unreacted epoxy group in the gel undergoes hydrolysis reaction in a carbonate buffer system with pH of 8-9, so as to effectively reduce the difficulty in impurity removal of cross-linked sodium hyaluronate gel and avoid the problem of toxicity of BDDE used in a cross-linking method of the prior art.

The invention relates to the field of the preparation of urethral stents, and discloses a polycaprolactone-collagen-fibroin nano three-dimensional porous stent and a preparation method thereof. The preparation method comprises the following steps of dissolving waste mulberry silk in a 0.1 percent of Na2CO3 aqueous solution, and repeatedly boiling for half an hour, so as to extract silk fibroin; dissolving the silk fibroin at a high temperature by using a ternary solution, dialyzing and filtering, and then putting at a room temperature for drying to form a regenerated silk fibroin membrane; dissolving the regenerated silk fibroin membrane, water-soluble collagen and polycaprolactone in hexafluoroisopropanol together, so as to form a mixed solution; carrying out electrostatic spinning on the mixed solution through a rotary receiving device, so as to obtain the nano three-dimensional porous stent, wherein a rotation speed is 300 to 500 revolutions per minute, and the diameter of a rotating shaft is 2 to 6 millimeters. The stent provided by the invention is convenient and efficient to process and manufacture, is convenient to apply, moreover, is convenient for adjusting various performances of a material, is stale in structure, and has certain mechanical strength to support the growth of a fresh tissue.

The invention discloses a gear double-spiral-type fluid viscous damper. The bottom end of a lower connecting plate is connected with the top end of a lower concrete connecting wall through a lower telescope-feed connecting piece, the top end of the lower connecting plate of the damper is closely connected with the bottom end of a viscous liquid tank with a viscous liquid filler and a communicating vessel inspection window, wherein the viscous liquid tank is welded by steel plates and filled with viscous liquid, and a spiral gear shaft and a stable gear shaft are embedded into the viscous liquid tank; a plurality of energy-consuming blades perpendicular to the rotating direction are welded on the spiral gear shaft, and the top end of a double-faced gear transmission rod is in close contact with the spiral gear shaft through a gear; and the bottom end of the double-faced gear transmission rod is in close contact with the stable gear shaft through a gear, and the double-faced gear transmission rod is connected with an upper concrete connecting wall through an upper connecting piece by adopting an upper telescope-feed connecting piece. According to the gear double-spiral-type fluid viscous damper, the energy-consuming capacity does not depend on structural relative deformation, the performance is stable and efficient, and the gear double-spiral-type fluid viscous damper can be widely used in anti-seismic and wind resistant design of multiple and high-storey buildings.

A high-elastic non-woven fabric with a honeycomb structure comprises a plurality of compound fiber meshes sequentially stacked in a back-and-forth Z shape. The compound fiber meshes are sequentially in end-to-end connection, and a hot melting fiber is clamped between the adjacent compound fiber meshes. When the high-elastic non-woven fabric is manufactured, through preparation prior to mesh formation and a process of mesh formation through mechanical combing, an upper layer fiber mesh, an elastic fiber mesh and a lower layer fiber mesh are prepared respectively and then are overlaid into the compound fiber mesh through a fiber mesh compounding process; each of the upper layer fiber mesh and the lower layer fiber mesh is the mixture of a low melting point polyester short fiber and a three-dimensional curly hollow polyester short fiber, and the elastic fiber mesh is the mixture of a low melting point polyester short fiber and an elastic polyester short fiber. The prepared compound fiber meshes are vertically laid through a vertical mesh laying process, the hot melting fiber is scattered between the compound fiber meshes, and then the high-elastic non-woven fabric with the honeycomb structure is obtained through a drying, trimming and winding process. The high-elastic non-woven fabric not only is high in elasticity and simple in structure, but also is low in cost and environmentally friendly.

The invention relates to the field of wrapping and target releasing of hydrophobic drugs and aims at providing a preparation method of a biodegradable supermolecule segmented copolymer and a copolymer micelle. The biodegradable supermolecule segmented copolymer is composed of a component A and a component B, wherein the component A is single-ended diamino-triazine functionalized polyglycol with the molecular weight of 1-10kDa; the component B is single-ended thymine or uracil polylactone with the molecular weight of 0.7-8kDa; and inserted segments of the component A and the component B are connected by virtue of a tritium bond between diamino-triazine and thymine or a uracil group. The prepared supermolecule segmented copolymer has high stability, is sensitive to external environment such as temperature, saline ions and pH value, adjustable in structure and performance and hopeful to being used in the field of controlled release. The preparation method of the biodegradable supermolecule segmented copolymer has good generality, can be used for preparing pyrimidine-end-functionalized polylactone and also can be used for preparing pyrimidine-end-functionalized polycyclic carbonate.

The invention belongs to the field of welding materials, and relates to a stainless steel welding wire material, in particular to an anti-cracking stainless steel welding wire and a preparation methodof the anti-cracking stainless steel welding wire. The welding wire is composed of a sheath and a flux core. The flux core is prepared from, by mass, 5-10% of SiO2, 3-8 parts of rare earth fluoride,1-5% of attapulgite clay, 3-8% of calcium oxalate, 10-15% of alloy powder, 5-8% of chromium metal, 5-10% of ferromanganese iron, 1-3% of molybdenum powder, 3-5% of potassium carbonate, 5-12% of alkalimetal oxide, 2-9% of titanate and the balance iron, wherein the sum of the mass percents of the components is 100%. According to the anti-cracking stainless steel welding wire and the preparation method of the anti-cracking stainless steel welding wire, the welding wire has the excellent mechanical properties such as excellent welding technological performance, good toughness and high strength, and is remarkable in anti-cracking effect; electric arc is stable, splashing is small, deslagging is easy, forming is meticulous and attractive, and full-position welding can be achieved; and the preparation method is simple, low in cost, high in efficiency, environmentally friendly, free of pollution and capable of achieving large-scale production.

The invention relates to a nickel-molybdenum catalyst and a method for preparing the same, in particular to a method for preparing a nickel-molybdenum hydrogenation catalyst. Nickel-containing aluminum oxide is used as a carrier for the nickel-molybdenum hydrogenation catalyst. The nickel-molybdenum hydrogenation catalyst contains nickel and molybdenum which are active components, the nickel-containing aluminum oxide is used as the carrier, nickel-containing pseudo-boehmite is used as a precursor for the nickel-containing aluminum oxide carrier, and procedures for preparing the nickel-containing pseudo-boehmite include acid-base neutralization and gelatinizing procedures. The method has the advantages that the specific carrier is used in the nickel-molybdenum hydrogenation catalyst, accordingly, the nickel and pseudo-boehmite can be organically bound with each other, the active component nickel can be effectively dispersed in the pseudo-boehmite, and the nickel-containing aluminum oxide carrier in specific crystal forms can be formed; good effects of regulating pore structures and the acidity of the carrier can be realized, procedures are simple as compared with catalysts simply prepared by the aid of impregnation processes, and the performance of carrier materials is easy to modulate; the nickel-molybdenum hydrogenation catalyst prepared by the aid of the method is high in hydrogenation activity and selectivity and good in chemical stability and thermal stability, and the like.

The invention discloses a dynamically cross-linked SBS hot-melt pressure-sensitive adhesive and a preparation method thereof, and belongs to the technical field of adhesives. The adhesive comprises the following raw materials: an SBS thermoplastic elastomer, an antioxidant, an ultraviolet light initiator and a phenylboronic acid ester dynamic cross-linking agent. The phenylboronic acid ester dynamic cross-linking agent participates in construction of an SBS hot-melt pressure-sensitive adhesive cross-linked network through ultraviolet irradiation, so that the softening temperature of the SBS hot-melt pressure-sensitive adhesive is increased, and the heat resistance of the pressure-sensitive adhesive is improved. Due to the formation of a dynamic cross-linked network, the average molecular weight of the SBS hot-melt pressure-sensitive adhesive is increased, and the body viscosity and cohesive strength of the pressure-sensitive adhesive are obviously improved. Besides, the phenylboronic acid ester covalent bond has excellent ester exchange capacity, and the formed cross-linked network has dynamic characteristics, so that the phenylboronic acid ester covalent bond is fractured and recombined at high temperature, the cross-linked material is endowed with repeatable adhesive property, and the practicability of the material is improved.

A high-elastic antibacterial non-woven fabric with a honeycomb structure comprises a plurality of compound fiber meshes sequentially stacked in a back-and-forth Z shape. Antibacterial agents are sprayed into the compound fiber meshes, the compound fiber meshes are sequentially in end-to-end connection, and hot melting fiber is clamped between the adjacent compound fiber meshes. When the high-elastic antibacterial non-woven fabric is manufactured, through preparation prior to mesh formation and a process of mesh formation through mechanical combing, an upper layer fiber mesh, an elastic fiber mesh and a lower layer fiber mesh are prepared respectively and then are overlaid into the compound fiber meshes through a fiber mesh compounding process; the upper layer fiber mesh and the lower layer fiber mesh are mixture of low melting point polyester short fiber and three-dimensional curly hollow polyester short fiber, and the elastic fiber mesh is mixture of low melting point polyester short fiber and elastic polyester short fiber. After the antibacterial agents are sprayed into the compound fiber meshes, the meshes are vertically laid through a vertical mesh laying process, the hot melting fiber is scattered between the compound fiber meshes, and then the high-elastic antibacterial non-woven fabric with the honeycomb structure is obtained through a drying, trimming and winding process.

The invention relates to a hydrotreatment method of refinery plant mixed C4 raw materials. A palladium-silver hydrogenation catalyst and a fixed bed reactor are used; the hydrogenation process conditions are as followings: the liquid volume airspeed is 2.0 to 10.0h<-1>; the inlet temperature of the reactor is 30 to 80 DEG C; the reaction pressure is 1.0 to 2.0 MPa; the mole ratio of hydrogen to butadiene is (1.1 to 3):1; the used palladium-silver hydrogenation catalyst uses nickel-containing aluminum oxide with specific crystal form as a carrier and palladium as an active ingredient; through being metered by using the catalyst weight as 100 percent, the palladium content (being metered by simple substances) is 0.05 to 0.5 weight percent; the nickel content (being metered by simple substances) is 1.0 to 4.0 weight percent; silver oxide accounts for 0.15 to 2.8 weight percent; alkali metal and/or alkaline-earth metal oxide accounts for 0.5 to 5.0 weight percent. Under the application method and process conditions, the catalyst has good butadiene hydrogenation activity and selectivity; the hydrogenation product can be used as raw materials for producing high-purity 1-butylene.

The invention provides filament yarn bonding type honeycomb structure high-elastic antibiosis non-woven cloth. The filament yarn bonding type honeycomb structure high-elastic antibiosis non-woven cloth comprises a plurality of synthetic fiber nets sequentially stacked in a reciprocating Z shape, an antibacterial agent is sprayed inside the synthetic fiber nets, the synthetic fiber nets are sequentially connected in an end-to-end mode, the fiber net included angle between the adjacent synthetic fiber nets is an acute angle smaller than 2 degrees, hot melting filament yarns are arranged on the front surfaces and the back surfaces of the synthetic fiber nets in the width directions of the synthetic fiber nets at equal intervals in a side by side mode, and the hot melting filament yarns are folded in the reciprocating Z shape with the synthetic fiber nets. Each synthetic fiber net is a layer-shaped fiber net and formed by overlapping an upper layer fiber net, an elastic fiber net and a lower layer fiber net. The preparation method comprises the following steps that 1, preparation before net forming is conducted; 2, machinery carding for net forming is conducted; 3, fiber net synthetization is conducted; 4, the antibacterial agent is sprayed, 5, the nets are vertically laid; 6, drying is conducted; 7, edge cutting is conducted; 8, winding is conducted. The filament yarn bonding type honeycomb structure high-elastic antibiosis non-woven cloth has the advantages that not only is the high elasticity achieved, the antibacterial performance good, the structure simple, but also the cost is low, and the environment protection is achieved.

The invention relates to a nickel-silver series catalysts and a preparation method thereof, in particular related to a preparation method of nickel-silver series hydrogenation catalysts using nickel-containing alumina as a carrier. The nickel-silver hydrogenation catalyst contains active components of nickel and copper, the nickel-containing alumina is used as the carrier, a precursor of the nickel-containing alumina carrier is nickel-containing pseudo-boehmite, and the preparation process of the nickel-containing pseudo-boehmite includes acid-base neutralization and gelling processes; a specific carrier is used in the catalysts provided by the invention, and the specific carrier has the advantages that nickel and the pseudo-boehmite can be organically combined, so that the active component nickel is effectively dispersed in the pspseudo-boehmite, and the nickel-containing alumina carrier swith a specific crystal form is formed; the method has a good regulation effect on a pore structure and acidity of the carrier, and has the advantages of simple process and easy to adjust the performance of the carrier material compared with the preparation of the catalyst by an impregnation method; The nickel-silver series hydrogenation catalysts provided by the invention have high hydrogenation activity and selectivity, with good chemical stability and thermal stability.