65results about How to "Fine aperture" patented technology

A lighting apparatus comprising a support, a light source having an emission surface and disposed in the support, a lens disposed to face the emission surface of the light source, and a half-mirror film provided on at least a surface of the lens, the half-mirror film being a thin film comprising a metallic material such as aluminum, the lens being a light-focusing lens, the lens having a peripheral part and a central part, the peripheral part including a lens surface comprising a smoothly curved surface, and the central part including a Fresnel lens surface.

The invention relates to a preparation method of a microporous kyanite-based lightweight insulating refractory material. The preparation method is realized by comprising the following steps: (1) by taking kyanite, auxiliary materials and a cementing material as raw materials, adding a certain amount of dispersing agent, thickening time control agent and foam stabilizer, premixing, adding a certain amount of water, and mixing to prepare uniform slurry; (2) adding a certain amount of foaming agent in the slurry, mechanically agitating and foaming to prepare uniform foam slurry; (3) injecting the foam slurry into a mould, standing under a room-temperature environment so as to be cued and formed; (4) demoulding a green body, and then drying and sintering to obtain the microporous kyanite-based lightweight insulating refractory material. The prepared microporous kyanite-based lightweight insulating refractory material has the advantages of microfine air bore aperture (20-200mum), low volume density, high porosity, high strength, small sintering line change rate, low thermal conductivity, high usage temperature and the like. The raw materials are mainly kyanite, and other raw materials are common materials in refractory material industry, and are non-toxic and low-cost. The preparation method is simple and is easily controlled for the technology, and is suitable for industrial production.

The invention relates to the technical field of building material, in particular to a maritime work concrete corrosion-proof additive. The maritime work concrete corrosion-proof additive consists of a calcium sulphoaluminate expansion agent, a methyl naphthalene sulphonic acid water reducing agent, organosilicon hydrophobic powder, neopentylene glycol, milled slag powder, polypropylene fibers, silicon ash, superfine fly ash and arenaceous quartz. The maritime work concrete corrosion-proof additive can reduce the water consumption for mixing concrete, improve the water retention and cohesiveness, and improve the resistance of the concrete to seawater erosion and the durability.

The invention relates to a nano-material mixed modified superhigh-temperature high-performance well cementing slurry system and a preparation method thereof. The slurry system comprises the followingingredients in parts by weight: 100 parts of oil well cement, 15-25 parts of coarse silica sand, 15-20 parts of fine silica sand, 1-10 parts of nano-silicon dioxide, 1-10 parts of nano-calcium carbonate, 0.2-1 part of a defoaming agent, 4-10 parts of a fluid loss agent, 0-3 parts of a drag reduction agent, 0.5-4 parts of a retarder and 30-100 parts of water. In the slurry system, set cement has excellent compressive strength and toughness under superhigh temperature, and the compressive strength and the elasticity modulus cannot be obviously changed as the maintenance time is prolonged. The slurry system has good rheological property, lower water loss and proper thickening time, and the comprehensive properties of the slurry system can completely meet the related requirements of site wellcementing construction, so that the technical support is provided for well cementing under high temperature. A nano-material obtained by mixing the nano-silicon dioxide and the nano-calcium carbonateis added, and micropores of the set cement can be effectively filled, so that the system becomes denser. Therefore, the volume shrinkage of the set cement is relieved.

The invention discloses a low-porosity chrome corundum brick and a preparation method thereof. The low-porosity chrome corundum brick is prepared from the following raw materials in percentage by mass: 18-28 percent of corundum with the raw material granularity being 5-3mm, 30-40 percent of corundum with the raw material granularity being 3-1mm, 10-20 percent of corundum with the raw material granularity being 1-0mm, 10-20 percent of corundum with the raw material granularity being smaller than 0.088mm, 1-15 percent of high-content chromium ore or fused chrome oxide with the raw material granularity being 1-0mm and 2-15 percent of high-purity chromium oxide with the raw material granularity being smaller than 0.088mm; and in addition, a phosphate binder accounting 2-5 percent for the total mass of all the raw materials is added. According to the low-porosity chrome corundum brick and the preparation method, a product is prepared by material mixing, forming, sintering, impregnating with a nanometer oxide suspension and microwave drying according to burdening of the low-porosity chrome corundum brick, can lower the apparent porosity and the porosity aperture of a chrome corundum material, and reacts with permeated molten slag to form a high melting point substance, increases the viscosity of the molten slag, and slows down permeation of the molten slag.

The invention discloses a modified metakaolin-based permeation-resistant and crack-resistant agent for concrete. The modified metakaolin-based permeation-resistant and crack-resistant agent for concrete comprises: by mass, 10 to 75% of modified metakaolin, 5 to 40% of fine limestone powder, 4 to 40% of superfine coal ash, 1 to 20% of calcined hydrotalcite, 2 to 40% of fine quartz sand and 0.2 to 20% of solid silane powder. A preparation method of the modified metakaolin comprises the following steps of putting dry and washed kaolin into a bowl mill, carrying out grinding to obtain kaolin powder, carrying out calcination of the kaolin powder at a temperature of 500 to 1000 DEG C for 0.5 to 6.0 hours to obtain metakaolin, putting the metakaolin into a dispersion machine, adding an organic modifier of sulfamate or triethanolamine into the metakaolin, wherein a mass ratio of the metakaolin and the organic modifier is in a range of (5000: 1) to (100: 1), and carrying out dispersion to obtain the modified metakaolin having a contact angle of 50 to 100 degrees and a specific surface area of 8000 to 15000m<2>/kg. The modified metakaolin-based permeation-resistant and crack-resistant agentfor concrete can be utilized as a concrete additive, improves strength of concrete at different ages, does not produce obvious influences on concrete work performances, obviously improves anti-chloride ion penetration capability of concrete, reduces total shrinkage of concrete and improves crack resistance of concrete.

An inline type speckle multiplexed hologram recording apparatus and method is disclosed which can condense signal light and reference light in a sufficiently overlapping relationship with each other on a hologram recording medium without using a lens having a large aperture and a wide angle of view. A signal light region and a reference light region are displayed on a spatial light modulator, and laser light is intensity modulated with recording data displayed in the signal light region to produce signal light while the laser light having passed through the reference light region is used as reference light. The signal light and the reference light are diffused by a diffuser and then condensed in an overlapping relationship with each other on a hologram recording medium by a lens such that interference fringes produced thereby are recorded in the hologram recording medium.

The invention discloses a compound concrete anti-corrosion and rust-resistant agent which comprises the following components in parts by weight: 15-30 parts of a polycarboxylic acid water reducing agent, 3-12 parts of sodium dodecyl sulfate, 15.7-20.6 parts of N-dimethylethanolamine, 1-5 parts of sodium molybdate, and 50-60 parts of water. The compound concrete anti-corrosion and rust-resistant agent can block capillary holes in the concrete, improves the chloride ion permeability resistance of concrete, can significantly alleviate the damage of chloride ions on a reinforcing steel bar passivation film, enhances the sulfate corrosion resistant ability of the concrete, has excellent rust-resistant performance and good repair performance, can enhance durability of the concrete and the comprehensive anti-corrosion ability of the concrete, and significantly improves the durability of buildings.

The invention discloses a gypsum-based composite binding material for extruded 3D printing and a preparation method thereof and relates to the field of civil engineering/3D printing materials. Aimingat defects in the prior art, the invention provides the gypsum-based composite binding material for extruded 3D printing. The binding material is prepared from the following components: gypsum, pre-excited material, mineral additives, a plasticized water reducing agent, a waterproof agent, a crystal habit improver, a cystallizing stabilizer, a retarder, a dispersing agent, a water-retentive and thickening admixture, an adhesive, an antifoaming agent, a crystal modifier, a lubricating agent and fibers. The binding material disclosed by the invention has the beneficial effects that the preparedgypsum-based composite binding material for extruded 3D printing is wide in source, excellent in liquidity and environmentally friendly and has excellent extrusion continuity, constructability, mechanical property, water seepage resistance and cracking resistance.

The invention belongs to the field of refractory materials, and particularly relates to a magnesium-chromium-zirconium composite brick. The magnesium-chromium-zirconium composite brick is produced by adopting the following materials: 30-50% of electrically-fused magnesium-chromium sand with the granularity of 3-5mm, 10-20% of electrically-fused magnesium-chromium sand with the granularity of less than 3mm, 10-30% of South Africa chromium concentrate with the granularity of not greater than 2mm, 5-15% of sintered magnesium sand powder with the granularity of not greater than 0.088mm, and 2-5% of an organic-inorganic compound binding agent. The magnesium-chromium-zirconium composite brick is produced by the following steps: mixing the materials except the organic-inorganic compound binding agent, then adding the organic-inorganic compound binding agent, carrying out mulling, pressing, drying, sintering to obtain a sintered brick, carrying out pressurized permeation on the sintered brick in a zirconium oxychloride solution, and drying. The magnesium-chromium-zirconium composite brick has the slagging resistance and the permeation prevention property of conventional magnesium-chromium refractory materials, is applicable to the field of refining of steel metallurgy, can remarkably prolong the service life of refining equipment and has good economical and social benefits.

The invention provides an interface agent, a preparation method thereof and an application of the interface agent in a fabricated building structure. The interface agent uses an ultrafine composition,and the low-temperature construction performance and the bonding strength of the interface agent are improved. The interface agent is prepared from a component A and a component B, wherein the component A is prepared from ordinary Portland cement, white Portland cement, a low-temperature reinforcing agent, a dispersing agent, fine aggregate, mineral powder and dense silica fume, and the componentB is prepared from emulsion, cellulose ether, a thickening time control agent, a defoaming agent and water. The interface agent has the excellent characteristics of high bonding strength, long hardening time, low temperature resistance and the like. The interface agent is applied to a fabricated building structure, and has remarkable economic and social benefits for improving the construction efficiency and engineering quality of the fabricated building structure.

The invention discloses a method for preparing an electromagnetic shielding foamed aluminum composite material. The method includes the steps that a magnesium block and a hollow ceramics microsphere are added by stepping composition, then, after a pre-treated titanium hydride foaming agent is added, the surface is provided with a layer of dense oxidation film, thus the mixture can be foamed intensively in a certain temperature range, the effect of aperture decreasing is realized, and finally, a novel closed-cell foamed aluminum composite material is obtained. According to the method for preparing the electromagnetic shielding foamed aluminum composite material, the obtained closed-cell foamed aluminum composite material has the characteristics of being low in cost, small in aperture, highin strength, excellent in electromagnetic shielding performance and the like.

The invention relates to a device and method for strengthening recycled aggregate by means of CO2. The device comprises a reaction kettle with a kettle cover, a plurality of layers of stacked material frames are arranged in the reaction kettle, a gas inlet connected with a carbon dioxide steel cylinder is formed in the side of the reaction kettle, a pressurizing opening is formed in the kettle cover and connected with the carbon dioxide steel cylinder through a booster pump, and the kettle cover is further provided with an exhaust port and a vacuum opening connected with a vacuum pump. The device is simple in structure, convenient to install and maintain, convenient to clean and high in universality. By means of reaction of CO2 and recycled aggregate, the recycled aggregate is strengthened, basic properties of the recycled aggregate are improved, the water absorption rate and porosity of the recycled aggregate are reduced, the aperture is reduced, carbonization time is shortened, carbonization depth is increased, the treatment effect is improved, the yield is increased, and the equipment utilization rate is increased.

The invention discloses a method for optimizing performance of calcium-based geopolymer by multi-component composite powder. The method includes the following steps: an influence rule of NaOH on hardened slurry strength is analyzed by utilizing a single-component slag as a gelling material; the influence rule of Na2SiO3 with different forms on compressive strength of granulation blast furnace slagnet paste is analyzed, and Na2SiO3 in a liquid state is determined to be adopted as an exciting agent; through analyzing the rule of the Na2SiO3 with different moduli on the compressive strength of the granulation blast furnace slag net paste, the Na2SiO3 in the liquid state the modulus of which is 1 is determined to be adopted as the exciting agent; finally the influence rule of the Na2SiO3 in the liquid state with different mixing amounts on the compressive strength of granulation blast furnace slag net paste is analyzed; monomer activity of various gelling materials and the influence rulethereof on the hardened slurry strength are researched according to an obtained alkaline exciting agent experiment parameter; and 80% of slag powder, 10% of metakaolin and 10% of fly ash are selectedas the multi-component composite powder. The calcium-based geopolymer is prepared by the multi-component composite powder, an effect that a calcium-based geopolymer hydration product and a pore structure thereof are optimized is achieved, and the compressive strength of the prepared calcium-based geopolymer is higher.

The invention discloses an expansive fiber crack-resistant waterproofing agent for concrete and a preparation method thereof, belonging to the technical field of concrete admixture production; and the expansive fiber crack-resistant waterproofing agent comprises the following components in%age by weight: 15-25% of wollastonite powder, 20-32% of coal gangue powder, 30-40% of pyrophyllite powder, 15-25% of desulfurized gypsum and 3-10% of cellulose fiber. According to the invention, through the synergistic effect of the desulfurizing gypsum, the coal gangue, the pyrophyllite, the cellulose fiber and the like, the compactness of the concrete is effectively enhanced, capillary pores are reduced, and the impermeability, corrosion resistance and bending resistance are greatly improved.

The invention discloses an anti-corrosion anti-cracking permeability reducing agent for marine concrete and a preparation method of the anti-corrosion anti-cracking permeability reducing agent, and belongs to the technical field of concrete admixtures. The anti-seepage agent is prepared from the following raw materials in parts by weight: 5 to 10 parts of a water reducing agent, 4 to 10 parts of a micro-nano anti-seepage component, 1.5 to 3.5 parts of an air entraining agent, 3 to 9 parts of anti-crack fiber, 1 to 3 parts of inositol hexaphosphate, 1 to 5 parts of polypropylene glycol, 0.5 to 1 part of hydroxy propyl distarch phosphate, 0.5 to 1.5 parts of chitosan and 20 to 30 parts of water. According to the anti-seepage agent disclosed by the invention, nano silicon dioxide is modified in two steps and then is mixed with the anti-cracking fiber, two isolated strength enhancing substances are organically combined and jointly act with other raw materials, the anti-seepage and anti-cracking properties of a concrete material are remarkably improved, and the obtained admixture does not contain substances harmful to a human body, is chlorine-free, green and environment-friendly, and has a good application prospect. The durability of the concrete in the marine environment can be greatly improved, the service life is prolonged, and the safety is improved.

The invention discloses an impact-resistant nanometer boron nitride-modified reactive powder concrete. Raw materials of the impact-resistant nanometer boron nitride-modified reactive powder concrete include cement, nanometer boron nitride, silica fume, fly ash, sands, a water reducer and water. The nanometer boron nitride can significantly enhance the dynamic compressive strength, dynamic peak strain and impact toughness of the reactive powder concrete. When the strain rate is in a range of 200-800/s and the dosage of the nanometer boron nitride is 0.25-0.5%, the dynamic compressive strength of concrete can be increased by 83.8%, the dynamic peak strain can be increased by 30.5%, and the impact toughness can be increased by 94.6%.