8results about How to "High apparent density" patented technology

The invention provides a propylene polymerization sphere-like catalyst component, a solid titanium main catalyst and a preparation method and application of the solid titanium main catalyst, the solid titanium main catalyst comprises titanium halide, magnesium halide and peroxidated benzoate internal electron donors, and under the action of an alkyl aluminum cocatalyst and an organosilicon compound external electron donor, the solid titanium main catalyst is prepared into the sphere-like catalyst component. The catalyst is used for propylene polymerization or copolymerization, shows very high polymerization activity, very good hydrogen regulation sensitivity and stereospecificity, can be used for preparing a green and environment-friendly propylene polymer with high polymer isotacticity, good particle morphology and less fine powder, and can be used for producing a polypropylene product with a high melt index.

This utility model discloses a device for casting, including a conveying unit, a fixing unit, a pressure roller assembly, and a locking device. The pressure roller assembly includes multiple connecting parts and a pressure roller body. The pressure roller body is connected to the fixing unit via the multiple connecting parts. The locking device is mounted on the connecting parts and connected to the pressure roller body, and is driven to apply or release pressure to the pressure roller body. This design, with its pressure roller assembly including multiple connecting parts and a pressure roller body, and the locking device mounted on the connecting parts and connected to the pressure roller body, allows the pressure roller body to uniformly compress and compact the molten alloy by adjusting the pressure through the locking device. It can adapt to molten alloy requiring different pressures, thereby reducing air bubbles inside the molten alloy, achieving a smooth surface, and increasing the apparent density of the alloy particles formed by the cooling and hardening of the molten alloy. This, in turn, ensures the quality of the alloy particles and improves work efficiency.

The invention provides a method for preparing bimodal / wide molecular weight distribution polyethylene by using a single reactor, which comprises the following steps of: catalyzing ethylene homopolymerization or copolymerization of ethylene and alpha-olefin by using a hydrocarbon solvent as a dispersing agent and using a vanadium polyethylene catalyst and aluminum alkyl as a main catalyst and a cocatalyst respectively, hydrogen is used as a polymer molecular weight regulator in the reaction process; wherein the vanadium polyethylene catalyst comprises a magnesium-containing carrier and a vanadium compound loaded on the magnesium-containing carrier, the total weight of the vanadium polyethylene catalyst is 100%, the mass content of active metal vanadium is not less than 3.8%, the average particle size of the vanadium polyethylene catalyst is 9.0-13.5 [mu] m, and the particle size distribution SPAN value is less than 1. The vanadium polyethylene catalyst used in the invention has higher polymerization activity, and the obtained polymer has higher apparent density and lower fine powder and oligomer, and can be used for developing special resins for high-strength films, pressure-resistant pipes and the like.

According to the aerosol generating product capable of being rapidly degraded and the preparation method of the aerosol generating product, a biodegradable fuming section, a biodegradable supporting section, a biodegradable cooling section and a biodegradable filtering section are formed by designing and matching specific biodegradable materials for four functional sections of the aerosol generating product respectively; the whole section of the aerosol generating product is completely biodegradable; the whole aerosol generating product can be effectively decomposed by microorganisms under the natural environment or industrial compost condition after being used, and is finally converted into carbon dioxide, water and biomass, so that the problem of persistent plastic pollution caused by cigarette waste is completely eradicated from the source, and the minimum influence of the whole life cycle of the product on the environment is realized; the global trend of circular economy and sustainable development is positively responded.

The present application relates to a kind of metallurgical grade chrome green and its preparation method and application.The preparation method of metallurgical grade chrome green includes the following steps: the pH value of hexavalent chromium salt solution is adjusted to acidic, and solution A is obtained;Reducing agent, seed crystal and alkali are mixed and then added to water, and high-dispersion mixed slurry B is obtained;High-dispersion mixed slurry B is heated to boiling, then solution A is added to high-dispersion mixed slurry B, to form fluid microelement, so that solution A and high-dispersion mixed slurry B react at the interface of fluid microelement, continue to react after feeding, so that the product is deposited, crystallized and grown, and intermediate product C is obtained;Intermediate product C is washed and calcined, and high-quality metallurgical grade chrome green product is obtained.The present application also provides a kind of metallurgical grade chrome green prepared by the preparation method as described in the present application.The present application solves the problem that the chromium green produced by the existing process has high impurity content and small particle size, which is difficult to meet the requirements of high-quality metallurgical grade chrome green.

The present invention discloses a microbial repair agent particle for a crack self-repairing cement-based material and a preparation method thereof. The repair agent particle has a core-shell structure and comprises a microbial repair agent core and a repair agent shell. The repair agent core comprises the following components by mass percentage: microbial powder: 10-15 parts, calcium source: 0.75-1.25 parts, nutrient: 2-3 parts, filler: 8-10 parts; the repair agent shell comprises the following components by mass percentage: sulfoaluminate cement: 6-8 parts, density adjustment powder: 1-3 parts, fly ash: 0-1 part. The present invention changes the formula of the repair agent core and adopts an extrusion granulation method to prepare the core particles, achieving a high loading rate of the microbial component in the core and a small particle size distribution coefficient of the core. At the same time, the repair agent particle has good sphericity, concentrated size distribution, small deviation of particle strength, uniform wall thickness, high yield rate, good responsiveness to cracking and good self-repairing effect on cracks in cement-based materials such as mortar and concrete.

This invention belongs to the field of aggregate strengthening, specifically relating to a silicon-based composite reagent-strengthened recycled aggregate and its preparation method. The preparation method includes the following steps: crushing and sieving virgin mortar samples, then rinsing to remove impurities to obtain low-quality recycled coarse aggregate; then, under certain conditions, adding lime slurry and surfactant to the low-quality recycled coarse aggregate, stirring, and allowing it to stand, followed by cyclic stirring; then adding water, a hydrophobic agent, silica fume, and fly ash, and maintaining standing for 6–12 hours; finally, immersing in water to remove soluble impurities from the surface of the recycled aggregate, and air-drying to obtain the silicon-based composite reagent-strengthened recycled aggregate. This method, by comprehensively utilizing industrial by-products such as silica fume and fly ash, explores the application potential of industrial waste products in the field of construction solid waste resource utilization, increases resource utilization rate, efficiently utilizes industrial solid waste, and is conducive to resource conservation and the reuse of waste.

The invention provides a water-soluble polyketone catalyst ligand and a synthesis method thereof. The synthesis method comprises the following steps: sequentially carrying out hydrolysis reaction and sulfonation reaction on 5, 5-bis [bis-(2-methoxyphenyl) phosphinomethyl]-2, 2-dimethyl-1, 3-dioxane, so as to obtain a water-soluble polyketone catalyst ligand; or 5, 5-bis [bis-(2-methoxyphenyl) phosphinomethyl]-2, 2-dimethyl-1, 3-dioxane is sequentially subjected to a hydrolysis reaction, a sulfonation reaction and a neutralization reaction, and the water-soluble polyketone catalyst ligand is obtained. Compared with the prior art, specific raw materials are selected to synthesize the water-soluble polyketone catalyst ligand according to specific process steps, overall good interaction is achieved, the synthesis method is simple and efficient in synthesis route, high in yield and few in by-product, the synthesized ligand is novel in structure, and the catalyzed polyketone polymerization reaction process is economical, safe, green and environmentally friendly; and the obtained polyketone product has high apparent density, and the catalytic activity is up to 18-25kg. (g.h) <-1 >.