66results about How to "Uniform degradation" patented technology

A method and apparatus is provided for controlling a delay line for achieving power reduction. The device comprises a delay lock loop to provide an output signal based upon a phase difference between a reference signal and a feedback signal, said delay lock loop comprising at least one delay circuit comprising a plurality of logic gates configured to provide for substantially uniform degradation of a plurality of NAND gates in a static state.

The invention relates to a medical alloy material, in particular to a uniformly degradable orthopedic implant magnesium alloy material. The orthopedic implant magnesium alloy material comprises the following components in percentage by weight: 0-5% of Gd, 1-5% of Nd, more than 0-2% of Sr, 0-0.5% of Zn, more than 0-1% of Zr and the balance of Mg. Due to the addition of magnesium alloy elements Gd and Nd, the strength and the corrosion resistance of the magnesium alloy are improved. In addition, a small amount of Gd and Nd are better in bio-safety; Sr has the effect of inducing growth of osteoblasts; Zn is a human necessary micronutrient element, and the ductility and the corrosion resistance of the alloy can be improved due to the addition of the Zn; and Zr has the effects of refining crystal grains and improving the strength and the corrosion resistance of the alloy and can enable the magnesium degrading speed to be more uniform, and no cell toxicity exists after a small amount of Zr is added.

The invention belongs to the field of environment protection and discloses a membrane bioreactor for denitrification and waste water denitrification method thereof. The membrane bioreactor is divided into a first anoxic pond, an aerobic pound, a second anoxic pound, an anaerobic pond and a membrane pound by a vertical deflecting baffle plate and an aeration device, wherein the ponds are five independent and communicated reactor chambers; after waste water enters the process, the biochemical treatment processes such as the degradation, nitrification and denitrification of organic matters are completed under the action of microorganisms; and effluent is obtained by membrane filtration and pumping. The bioreactor and the method have the advantages that: sludge mixed liquid flows in a piston flow mode in the whole system, but is in a fully mixed state in a single cell and a refluxing device is used, so the degree of mixing in the entire reactor is high and the mass transfer effect is good; under a condition of not adding extra carbon source, the process strengthens the denitrification by using high sludge concentration, so deep denitrification treatment is realized and the pollution to the membrane is relieved; and at the same time, due to the high efficiency trapping and separation characteristic of the membrane, the quality of effluent of filtration is high.

The invention discloses a rapid degradation type soybean protein simulation plastic film and a preparation method thereof and belongs to the processing field of biological materials and food packaging technologies. The preparation method of the soybean protein simulation plastic film which can be rapidly degraded and has a certain mechanical strength, elasticity, gas barrier property and water tightness is provided. The soybean protein simulation plastic film is prepared from 2-4% of soybean separation protein, 1.5-2.5% of polyvinyl alcohol, 2-3% of nano-crystalline cellulose and 2% of plasticizer. The nano-crystalline cellulose effectively increases the degradation speed of film materials and improves the mechanical performance of the film materials; the plasticizer is added so that the soybean protein, polyvinyl alcohol and the nano-crystalline cellulose can form a more compact and uniform three-dimensional net structure, and various properties of plastics can be highly simulated. The degradation time of the film ranges from 2 months to 7 months. The simulation plastic film is simple in preparation technology, is convenient to operate, free of pollution to the environment and good in biological compatibility and biodegradability, the requirement for environment friendliness is met, and the plastic film can be widely applied to the food packaging field.

The invention relates to the technical field of melt-blowing, in particular to a polypropylene nucleating and cooling bifunctional master batch and a preparation method and application thereof. According to the polypropylene nucleating and cooling bifunctional master batch, the prepared difunctional master batch with the stable cell and the aperture ratio can effectively absorb peroxide, the peroxide is uniformly dispersed in the bifunctional master batch, the dispersion of peroxide and the nucleating agent can be promoted when a melt-blown material is prepared to achieve uniform degradation,excessive degradation and other phenomena are avoided, the melt-blown material with the high melt flow rate is obtained, refining of melt-blown material grains by nucleating agents and the like can bepromoted, the melt-blown material with high transparency is obtained, non-woven fabric and the like can be prepared, and therefore the melt-blown material can be used for the fields of filtering, absorbing, keeping warm, absorbing oil and the like, such as mask preparation.

The invention discloses a degradable magnesium alloy material composed of multiple components as well as a preparation method and application thereof. The magnesium alloy material is formed by stacking a plurality of magnesium alloy layers with different component differences, wherein the component difference is that the adding elements in the magnesium alloy are different or the adding elements are the same, but the adding concentration is different. The preparation method comprises the following steps of (1) determining the type of required components, and placing the pure metal powder in different powder bins of a laser melting printer; (2) controlling the powder feeding amount of the pure metal powder of each element, and fully and mechanically mixing and then feeding the powder into apowder supply groove; and (3) carrying out melting and layered printing on the powder supplying laser in the powder supply groove to obtain the degradable magnesium alloy material with the corresponding shape and size and multiple components. The material is used as a medical implantable material to prepare bone repair or support materials. According to the degradable magnesium alloy material, mutual matching among the mechanical property, the degradation rate and the functionalization of the material is realized, and the requirements of the service environment of the biological material on the mechanical property, the degradation rate and the functionalization of the magnesium alloy are met.

The invention discloses a low-odor, high-toughness and high-electret polypropylene melt-blown material and a preparation method thereof. The low-odor, high-toughness and high-electret polypropylene melt-blown material comprises 100 parts of polypropylene, 0.1-0.5 part of an antioxidant, 0.05-0.5 part of a halogen absorbent, 0.2-0.8 part of a peroxide degradation agent, 0.05-0.5 part of an electretagent and 2-8 parts of a flexibilizer. The invention also provides a preparation method of the low-odor, high-toughness and high-electret polypropylene melt-blown material. The polypropylene melt-blown material provided by the invention has the characteristic of low odor, and the melt-blown cloth prepared from the melt-blown material has good toughness and electret effect.

The invention provides a surface coating composition of an implantable medical apparatus, the medical apparatus and a manufacturing method of the medical apparatus, wherein the surface coating composition is at least prepared by mixing a degradable carrier and therapeutic drugs; the degradable carrier is selected from either polylactic acid or a copolymer thereof; and the weight of the therapeutic drugs accounts for 0.1-80% in terms of the weight of the surface coating. The coating provided by the invention has such outstanding performances that the coating is excellent in drug controlled-release property, good in binding property with a main body stent, uniform in degradation and the like, and a degradation product is harmless to human body. Meanwhile, a provided coating preparation technique has significant advantages of being simple and convenient to operate, high in yield, being controllable and the like.

The invention relates to preparation of matrix particles capable of producing degradable mulching films, in particular to alloy matrix particles for preparing the degradable mulching films. The alloy matrix particles for preparing the degradable mulching films comprises the following components in percentage by weight: 0.01 to 0.03 percent of tert-butyl peroxy isopropyl benzene, 1.50 to 2.25 percent of fumaric acid, 4.50 to 5.60 percent of microcrystalline wax, 3.60 to 5.40 percent of polyethylene wax, 3.00 to 4.20 percent of MG70, 9.00 to 13.0 percent of N210 and 68 to 80 percent of corn starch. The alloy matrix particles for preparing the degradable mulching films have the advantages that: the alloy matrix particles can be restructured with PE structures to form a network bridge, so the prepared mulching films can be degraded quite uniformly; the problem of balancing the water tolerance and the hydrophilicity is solved, so the prepared mulching films can be attached to the ground surface, are difficult to blow away by wind, and have better function when used as the mulching films; and the mulching films can be blown to the thickness of 0.005mm and have small specific gravity, so the same amount of raw materials can produce more mulching films.

The invention provides a biodegradable medical zinc alloy repairing patch as well as a preparation method and application thereof, and belongs to the technical field of medical consumables. The biodegradable medical zinc alloy repairing patch is characterized in that zinc alloy wire materials with the cross sections in a round shape, an oval shape or a rectangular (flat strip) shape are used for weaving a porous reticular structure; an absorbable coating is arranged on the reticular structure. The repairing patch can be prepared into different film coated repairing patches through being pressed with an absorbable film layer on the surface, and can be applied to different clinic diseases. The prepared repairing patch has the advantages of low cost, simple processing, low thickness, high toughness, good biocompatibility and the like. After the repairing patch is implanted into the human body, high mechanical property can be maintained in a certain period; meanwhile, after the wound of the patient heals, the patch can be degraded and absorbed by the human body without residue in the body; uncomfortable feeling and untoward effect of the patient in the later period of the healing can be reduced.

The present invention relates to the preparation process of high flowability polypropylene and solves the technological problem of providing high energy ray preparation process of high melt flowability polypropylene. The present invention features that polypropylene grains are set inside high energy ray irradiation chamber and irradiated in the irradiation dosage over 100 Mrad at normal temperature for over 10 hr to obtain high flowability polypropylene with melt rate of flow MRF as high as 50-100 g/10 min. The present invention adopts high energy gamma ray with powerful penetration capacity and homogeneous degradation from inside grain to outside and can regulate the flowability of the polypropylene product easily via regulating irradiation dosage. The process of the present invention needs no mechanical stirring, low power consumption and low cost.

The invention relates to a degradable non-woven submicron fiber membrane and a preparation method thereof, as well as a purpose thereof for postoperative adhesion prevention of tissues and organs. A textile is prepared by adopting an electrostatic spinning method. The fiber membrane prepared by the method has good flexibility, air permeability and an effective tissue cell isolation function. A submicron structure with high specific surface area is also conductive to fast and uniform degradation of fiber. The fiber membrane after sterilization treatment can be used as a postoperative anti-adhesion membrane.

The invention belongs to the technical field of alloy materials, and discloses a degradable and high-toughness composite material and a preparation method thereof. The composite material comprises a zinc alloy layer, an intermediate alloy layer and a magnesium alloy layer, wherein the intermediate alloy layer is composed of a magnesium-zinc alloy, the zinc alloy layer does not contain Mg, the magnesium alloy layer does not contain Zn, the zinc alloy layer is composed of a zinc alloy, the zinc alloy further comprises Y and/or Nd, the magnesium alloy layer is composed of a magnesium alloy, the magnesium alloy further comprises Y and/or Nd, and the magnesium-zinc alloy comprises the following components in percentage by mass: 50-80% of Mg and 20-50% of Zn. Due to the existence of the intermediate alloy layer in the composite material, the connection between the zinc alloy layer and the magnesium alloy layer is enhanced, the mechanical property of the composite material is improved, and particularly, an elastic modulus of the composite material is obviously reduced relative to an elastic modulus of the zinc alloy, so that the healing of bone tissues is not influenced, and a degradationrate of the composite material in a human body is reduced.

The invention provides deplasticization film-forming oil and a preparation method thereof. The deplasticization film forming- oil is prepared from laminating adhesive, waterborne acrylic solid resin,a first auxiliary and a second auxiliary, the first auxiliary is a leveling agent and a wetting agent, and the laminating adhesive is prepared from a reaction monomer, a modified monomer, a third additive, a fourth additive and water; the reaction monomer at least comprises acrylic acid, butyl acrylate, styrene, hydroxyethyl acrylate and 2-ethylhexyl acrylate, the modified monomer is an N- (hydroxymethyl) acrylamide aqueous solution, the third additive is a coalescing agent, an emulsifier and an initiator, and the coalescing agent is Texanol. The deplasticization film-forming oil disclosed bythe invention is high in film-forming speed, strong in adhesive force, high in glossiness and good in mechanical property, does not contain plastic components such as PP, PVC, PET and PE in a traditional protection film, and is a protection film material with excellent comprehensive performance.

The invention belongs to the technical field of alloy materials, and discloses an alloy material with antibacterial property and high toughness and a preparation method and application thereof. The alloy material comprises a magnesium alloy layer, an intermediate alloy layer and a zinc alloy layer, wherein, the magnesium alloy layer and the zinc alloy layer comprise Ag and Cu; and the intermediatealloy layer is made of magnesium-zinc-silver-copper alloy. The magnesium alloy layer is made of magnesium alloy, and the magnesium alloy further comprises at least one of Nd, Sn or Sr; and the zinc alloy layer is made of zinc alloy, and the zinc alloy further comprises at least one of Nd, Sn or Sr. The alloy material can simultaneously satisfy the characteristics of long-acting antibacterial function, lower degradation rate and favorable mechanical properties, has obvious killing effects on staphylococcus aureus, Escherichia coli, Candida albicans, pneumobacillus, proteus and salmonella typhimurium, and has important application value in the field of medical implant materials.