8results about How to "Porous" patented technology

The invention discloses low-shrinkage all-solid waste concrete and a preparation method thereof. The low-shrinkage all-solid waste concrete is prepared from the following raw materials in parts by mass: 14 to 20 parts of solid waste-based cementing material, 25 to 40 parts of high-titanium heavy slag sand, 35 to 50 parts of high-titanium heavy slag gravel, 5.5 to 7.5 parts of water and 0.2 to 0.5 part of water reducing agent, the solid waste-based cementing material comprises the following components in parts by mass: 40-70 parts of water-quenched slag powder, 10-30 parts of carbide slag, 10-20 parts of gypsum, 5-20 parts of fly ash and 0-5 parts of silica fume. By utilizing the internal curing effect of the titanium slag aggregate, continuous water can be provided for concrete hydration, the later-stage dry shrinkage of the concrete is reduced, and the strength of the concrete is improved; the high alkalinity of the carbide slag and the high sulfate content of the gypsum are utilized, and the alkali-sulfate synergistic excitation effect is utilized, so that the activity of the water-quenched slag powder and the like can be fully excited under the condition that cement and a chemical exciting agent are not used, and the strength performance of the concrete is ensured; meanwhile, steel slag is not used as a component material, so that the problem of poor concrete volume stability caused by the steel slag can be avoided.

The invention provides a preparation method of 4-dimethylaminopyridine and a catalyst of 4-dimethylaminopyridine, and belongs to the technical field of organic chemistry. Comprising the following steps: (1) adding a catalyst into pyridine, heating, adding chlorine water, carrying out heat preservation reaction, adjusting the pH value of the solution by hydrochloric acid, separating an organic phase, carrying out reduced pressure distillation, and collecting distillate at 140-150 DEG C to obtain 4-chloropyridine; and (2) reacting 4-chloropyridine with dimethylacetamide, adding alkali liquor into the product to adjust the pH value of the solution, extracting with diethyl ether, concentrating, recrystallizing with ethyl acetate, filtering, washing and drying to obtain the 4-dimethylaminopyridine. The preparation method disclosed by the invention is simple, mild in condition, controllable and safe, the prepared 4-dimethylaminopyridine is relatively high in purity, the yield is also obviously improved, and the preparation method has a wide application prospect.

The invention discloses an antibacterial healing-promoting porous medical dressing and a preparation method thereof, and relates to the technical field of medical dressings. The method comprises the steps of S1, foam material pretreatment, S2, dressing bag manufacturing, S3, foaming treatment, S4, curing processing and S5, surface treatment. According to the antibacterial healing-promoting porous medical dressing prepared through the processes S1-S5, the outer layer of a foam dressing is made of a hydrophobic material, the inner layer of the foam dressing is made of a hydrophilic material, the foam dressing has porosity, low surface tension, high elasticity, high plasticity and light weight, exudate of a wound surface is controlled by means of a transfer and absorption mechanism of water vapor, and the wound healing-promoting effect is achieved. The absorbability of the dressing on percolate can reach 10-15 times of the mass of the dressing, and the dressing is completely permeable to oxygen and carbon dioxide, can be used as a drug carrier, can be prepared into various thicknesses and has a better protection effect on wound surfaces.

The application discloses a modified diaphragm for lithium-sulfur batteries and a preparation process thereof. The modified diaphragm comprises a base diaphragm and a composite layer arranged on the surface of the base diaphragm. The composite layer is doped with nano metal oxide and cobalt nonasulfide. The application sets the composite layer on the base diaphragm. The composite layer is made of metal sulfide and metal oxide. The metal sulfide cobalt nonasulfide is arranged in an array on the surface of the base diaphragm. Since the metal sulfide has porosity and polarity, and the metal oxide has adsorption and catalytic properties, the two are combined. The physical barrier and chemical adsorption of the metal sulfide are utilized, the catalytic effect of the metal oxide is fully exerted, the mechanical stability is improved, the shuttle effect of polysulfide is effectively prevented, the prepared composite layer inhibits the shuttle effect, and the Coulomb efficiency and cycle life of the lithium-sulfur battery are improved.

The invention discloses a traditional Chinese medicine composition for treating asthma and a preparation method thereof. The traditional Chinese medicine composition is prepared from the following raw materials in parts by weight: 2-10 parts of pericarpium citri reticulatae, 2-10 parts of roses, 2-10 parts of sword beans, 2-10 parts of pinellia ternate, 4-20 parts of scaphium scaphigerum, 4-20 parts of semen armeniacae amarae, 4-20 parts of radix stemonae, 4-20 parts of folium eriobotryae, 3-16 parts of polygala japonica, 3-16 parts of folium mori and 40-200 parts of lean pork. The composition disclosed by the invention has an obvious effect of treating asthma; in addition, the gelatin-containing microspheres are used for carrying out tannin removal treatment on roses and folium eriobotryae in the traditional Chinese medicine composition to reduce the influence of tannin components on other medicinal components, and the gelatin microspheres subjected to tannin removal are recycled and applied to bitter apricot kernel processing, so that the nutrition loss can be reduced while the enzyme deactivation and glycoside protection effects are improved; the asthma treatment effect of the composition is comprehensively improved; on the basis, the taste of the traditional Chinese medicine composition is improved, a specific flavoring agent is added during preparation of the composition, and the traditional Chinese medicine composition with good taste is obtained.

The invention is applicable to the technical field of plastic processing, and provides a transparent flame-retardant polypropylene ultra-thin sheet and a preparation method thereof. The transparent flame-retardant polypropylene ultra-thin sheet comprises the following raw materials: polypropylene, an organic phosphorus flame retardant, a permeability enhancer, a nano inorganic additive, modified polyethylene glycol, an antioxidant, modified nano mullite, and a lubricant. The transparent flame-retardant polypropylene ultra-thin sheet has high transparency and high flame retardant performance, and its transparency can reach more than 90%. The flame retardant grade of UL94V-0 is achieved within a thickness range of 0.2-1.0 mm, which is superior to ordinary polypropylene and a polypropylene ultra-thin sheet with flame retardant added. The preparation method is environmentally friendly, does not need to use a halogen flame retardant, and avoids environmental pollution and human harm caused by the halogen flame retardant. At the same time, the used organic phosphorus flame retardant and the nano inorganic additive are both low-toxic or non-toxic substances, which are harmless to the environment and the human body.

This utility model relates to the field of drainage pipe technology, specifically to a hydraulic drainage pipe with a buffer function. It includes a drainage pipe comprising a first pipe and a second pipe horizontally fixedly connected at their ends; and a buffer assembly, which includes an annular plate disposed on the outer side of the second pipe, the diameter of which is larger than the diameter of the second pipe. Multiple mounting plates are disposed on the inner side of the annular plate, and buffer springs are fixedly connected to each of the mounting plates and the annular plate. The variable diameter design, the buffer assembly, and the synergistic effect of the foam layer effectively reduce the impact and wear of water flow on the pipe. The buffer assembly reduces the direct damage to the pipe from the impact force, and the foam layer reduces the wear of the pipe's inner wall caused by water flow scouring. These multiple protective measures together extend the overall service life of the pipe, ensuring stable and efficient operation, effectively mitigating water flow impact, reducing noise, and extending the pipe's service life.

The invention provides an electrolytic water oxygen evolution catalyst with a NiFe2O4-coated CoCr-LDH heterostructure, which is prepared by the following steps: adding nickel salt, ferric salt, ammonium fluoride and urea into water, and uniformly stirring to obtain a mixed solution; immersing a clean foam substrate in the mixed solution, placing in a reaction kettle, and carrying out hydrothermal compounding at a certain hydrothermal temperature for a certain hydrothermal time, so as to grow a NiFe-LDH sheet on the surface of the foam nickel; cleaning and drying the obtained sample, and then carrying out heat treatment at a proper temperature to obtain a supported NiFe2O4 material; the preparation method comprises the following steps: taking a NiFe2O4 material as a working electrode, dipping the NiFe2O4 material in a reaction solution containing cobalt salt and chromium salt, carrying out electro-deposition reaction, and depositing a thin layer of CoCr-LDH nanosheets on the surface of the material; the obtained working electrode is washed and dried, and the water electrolysis oxygen evolution catalyst with the NiFe2O4 and CoCr-LDH heterostructure is obtained. The catalyst shows excellent oxygen evolution reaction activity and excellent catalytic stability under an alkaline condition; the method is low in raw material cost, simple in process, low in equipment requirement and high in repeatability.