342results about How to "Moderate density" patented technology

The invention discloses a rapidly degradable magnesium alloy material. The material comprises the following components: elements such as Al, Li, Ca, Y, Si, Ni, Cu and Fe. The invention also discloses a preparation method and the application of the rapidly degradable magnesium alloy material. Compared with the prior art, the rapidly degradable magnesium alloy material has the advantages that the problems of failure in resisting high temperatures and failure in meeting high-temperature and high-bearing operation requirements of the existing easily degradable materials or easily degradable magnesium alloy materials and products thereof are solved, meanwhile, the material is controllable in density, the slag or the corrosion product of the material meets the requirements of flowback operations, and multiple technical effects of simplicity and high efficiency, low cost, energy conservation, environmental protection and the like can be achieved.

The invention relates to a car door-window straight-line part gland strip and a preparation method, which iare used for solving the problem that the compression permanent deformation rate of the present car door-window straight-line part gland strip is high, and adopts the technical scheme that: the gland strip is prepared by the following substances in part by weight: 22 to 27 ethylene propylenediene rubber 9090M, 6 to 10 ethylene propylene diene rubber 3072EM, 1 to 3 active zinc oxide, 0.4 to 0.8 stearic acid, 0.4 to 1.0 dispersant L-24, 0.7 to 1.1 polyethyleneglycol, 25 to 30 general purpose furnace black (GPF)-grade carbon black N650, 10 to 14 heavy calcium carbonate, 16 to 20 paraffin oil, 1 to 3 calcium oxide, 1.3 to 1.7 accelerator, 0.05 to 0.08 antiscorching agent, 0.2 to 0.6 sulfur and 0.8 to 1.2 p,p'-Oxybis(benzenesulfonyl hydrazide) N8000W. The car door-window straight-line part gland strip has good elasticity, good aging resistance, excellent ozone property, good low-temperature application property and appropriate apparent density.

The invention discloses a high-strength silicon carbide ceramic pipe and manufacturing method thereof, and belongs to the technical field of engineering ceramic materials. Silicon carbide ceramic powders with different granularities are used as the main raw materials, graphite powder and carbon black are used as binders, and resin is used as a binder. The materials are uniformly mixed by a spray granulation process; an organic plasticizer of cellulose and a lubrication agent are added into the mixture; and vacuum pugging, decaying and extrusion molding are conducted to obtain a pipe base substrate; and the base substrate is subjected to drying solidification, high temperature sintering reaction, sandblast and heat treatment to obtain the high strength silicon carbide ceramic pipe. The pipe biscuit manufactured by the process has high strength and length of more than 4000mm; after sintering, the pipe has strength of 300MPa or more, and has the advantages of moderate density, high thermal conductivity, high fracture toughness, good thermal shock resistance and low cost, and can be widely applied to chemical and metallurgy fields, such as acid and alkaline corrosion and high temperature erosion.

The invention discloses a water-based nano reflection and heat insulation transparent coating and a preparation method thereof. The formula of the coating comprises the followings in percentages by weight: 35%-50% of a water-based acrylic emulsion, 5%-15% of water-based lithium silicate, 5%-15% of a water-based polyurethane emulsion, 5%-10% of a water-based heat insulation nano dispersion sizing agent, 5%-10% of a water-based heat insulation and heat preservation nano dispersion, 2%-12% of a wetting dispersant, 0.2%-0.5% of a flatting agent, 0.2%-1% of a thickener, 0.1%-0.2% of an antifungus and anti-mildew agent, 0.5%-2.5% of a coalescing agent, 0.5%-2% of a silane coupling agent and 5%-25% of deionized water. According to the water-based nano reflection and heat insulation transparent coating disclosed by the invention, under the precondition of without influencing lighting, heat radiation is blocked and infrared heat energy is prevented from being conducted into the interior of a base material through effective reflection and heat energy conduction, and thus the effects of heat insulation and heat preservation are reached. Heat energy, entering the room through the base material, generated by an outdoor heat source can be effectively blocked in summer, and indoor heat can be effectively blocked from being dispersed in winter, so that the application of refrigeration and heat preservation equipment can be effectively reduced, and the energy-saving effect is obvious.

The invention relates to a formula of compound puffed feed for Leiocassis longirostris and process for preparation, wherein the constituents in the formula comprise (by mass ratio): soybean 20-50%, cotton seed waste 0-15%, groundnut meal 10-15%, fish meal 2-4%, meat and bones meal 0-15%, blood powder 0-5%, wheat flour 8-15%, maize 12-20%, fish oil 1-2%, calcium dihydrogenphoshate 0.5-1%, premixed material 1-2%. The preparing process consists of proportioning the constituents, mixing with disintegrated soybean cake raw material and maize homogeneously, disintegrating, modulating, palletizing and drying.

The invention relates to a process for manufacturing dumbbell and barbell products. A material obtained by mixing iron powder and a binding agent is pressed into the shapes of barbell products, or the material obtained by mixing the iron powder and the binding agent is filled into a mould cavity produced according to the shapes of the barbell products, the expected shapes, dimensions and weights are achieved, and sizing, demoulding and air drying are carried out, thus specific products are obtained. The process is simple and easy to operate, the product cost is moderate, the density is moderate, and the produced products can substitute dumbbells, dumbbell discs, barbells, barbell discs, kettle bells or counter weight rods made by a mixture of cast iron and cement.

The invention discloses a water glass transparent reflecting heat-insulation coating material and a preparation method thereof, wherein the water glass transparent reflecting heat-insulation coating material comprises, by mass, 35-50% of an aqueous acrylic emulsion, 5-15% of an aqueous silica sol, 5-15% of an aqueous polyurethane, 5-10% of an aqueous nanometer antimony tin oxide heat-insulation slurry, 5-10% of an aqueous nanometer lanthanum hexaboride heat-insulation slurry, 5-10% of an aqueous nanometer vanadium dioxide heat-insulation slurry, 0.1-0.5% of an anti-foaming agent, 0.1-0.3% of a wetting dispersing agent, 0.2-0.5% of a leveling agent, 0.2-1% of a thickening agent, 0.1-0.2% of an anti-mildew antibacterial agent, 0.5-2.5% of a film forming auxiliary agent, 0.5-2% of a silane coupling agent, and 5-25% of deionized water.

The invention discloses a method for preparing isocyanate terminated polyether/phenolic resin foamed plastic and belongs to the field of foam heat insulating materials. The method comprises the following steps of: adding a surfactant and a foaming agent into special expandable phenolic resin to form a component A; and uniformly mixing and stirring the component A and an isocyanate terminated polyether pre-polymer serving as a component B; pouring the mixture into a mold; and foaming and curing the mixture at normal temperature, wherein the mass ratio of -NCO contained in the isocyanate terminated polyether pre-polymer to the expandable phenolic resin is 0.1-0.6:1; the foaming agent is a physical foaming agent of which the boiling point is low; the -NCO group content of the isocyanate terminated polyether pre-polymer is between 18.5 and 19.5 mass percent; and the viscosity of the isocyanate terminated polyether pre-polymer is between 0.15 and 0.65 Pa.S at the temperature of 25 DEG C. The speed of the reaction of the phenolic resin and an isocyanate group is stable and foam density is appropriate (between 56 and 109 kg/m<3>) and can be adjusted through the using amount of the foaming agent.

The invention provides a method for building and managing a famous tea mechanical plucking tea garden, and belongs to the technical field of plant cultivation. The method is characterized by mainly comprising the steps of tea garden selecting, tea plant variety selecting, planting, tree crown cultivating and pruning, mechanical plucking period and remaining, maintaining of plucked tea tree crowns and the like, wherein frames of tea trees of the built tea garden are clear in layer, ventilative and transparent, growing branches are thick and uniform in distribution, the tree crowns are small in surface, stumps are uniform in thickness, and the density reaches about 1000/m<2>; young sprouts of each tea tree grow on a regular and smooth tree crown surface, bud leaves are distributed uniformly, the density is proper and can reach about 2000/m<2>, timely plucking is conducted, the raw material yield of famous tea can reach 70%-75%, and the plucking effect is good.

A preparation method of a C/C-SiC-MoSi2 ceramic-based composite material includes the following steps: 1) dispersing silicon carbide powder and molybdenum disilicide powder in isopropyl alcohol, and performing ultrasound vibration and stirring to obtain a suspension liquid A and a suspension liquid B: 2) increasing the density of a low-density carbon fiber stereo fabric in a manner of hydrothermal permeation of glucose, and placing the fabric in a suction filtration device having a glass sand core; 3) pouring the suspension liquid A and the suspension liquid B successively into a suction filtration flat-bottom funnel to enable the suspension liquids to pass the C/C composite material completely; 4) performing a homogeneous phase hydrothermal reaction until the density is 1.2-1.5 g/cm<3>; and 5) performing thermal treatment to obtain the C/C-SiC-MoSi2 ceramic-based composite material. The composite material is moderated in density, is compact in structure, and is excellent in interface binding between a C/C interface and a SiC interface, the SiC interface and a MoSi2 interface and the C/C interface and the MoSi2 interface. The raw materials are easy to obtain. The preparation method is simple in operation, is low in cost, is environment-friendly and is pollution-free.

The invention discloses a gold micron feather cluster modified with silver nanoparticles and a preparation method and application thereof. The gold micron feather cluster is characterized in that the silver nanoparticles are coated on an aluminum sheet, of which the surface is provided with pit arrays, wherein the particle diameter of the silver nanoparticles is 15-25 nm, and the gold micron feather cluster has the diameter of 32-658 microns and consists of gold micron feathers which consist of gold nanoparticles with the particle diameter of 200 nm to 1 micron and have the feather rod length of 16-329 microns, the feather branch length of 8-160 microns and the small feather branch length of 2-13 microns. The method comprises the following steps of: firstly obtaining the aluminum sheet, of which the surface is provided with the pit arrays which are hexagonally arranged in an orderly manner and are bowl-shaped, by using an anodic oxidation method; carrying out gold nanoparticle ion sputtering on the aluminum sheet so as to obtain the aluminum sheet coated with the gold nanoparticles; then putting the aluminum sheet coated with the gold nanoparticles in an argon atmosphere, and annealing so as to obtain the aluminum sheet coated with the gold micron feather cluster; and carrying out silver nanoparticle ion sputtering on the aluminum sheet coated with the gold micron feather cluster, thereby producing a target product. The gold micron feather cluster modified with the silver nanoparticles can serve as a surface-enhanced Raman scattering active substrate, and the content of rhodamine or tetrachlorobiphenyl attached onto the gold micron feather cluster is measured by using a laser Raman spectrometer.

The invention discloses a preparation method for forming open-cell phenolic resin based carbon foam by a one-step method. Key points of the method comprise the following steps: a thermoplastic phenolic resin, hexamethylenetetramine and a foaming agent are mixed evenly under normal temperature, then are carefully loaded into a mould made of a carbon electrode material, and are subjected to cold compression premolding under certain pressure, and then the mould is well fixed by a fixture. Under normal pressure, the mold which is well fixed and is loaded with a sample is placed into a carbonization furnace and is increased to be 800 DEG C according to certain temperature program to be foamed, solidified and carbonized to obtain the open-cell phenolic resin based carbon foam.

An OSB ecological painting-free decorative surface furniture plate comprises at least one OSB blank plate; a decorative surface layer is composited on at least one surface of the OSB blank plate by at least one buffer balance layer in the middle; the preparing method comprises the following steps of a, manufacturing the OSB blank plate: machining a raw material into a thin long wood chip which is 40-120mm long, 5-20mm wide and 0.3-0.7mm thick along the grain direction, paving a three-layer or four-layer criss-cross structure by gluing, and manufacturing the blank plate by adopting a continuous hot press process; b, compositing by adopting a direct attaching mode: compositing the OSB blank plate and a veneer which is 0.1-3.0mm thick to manufacture an OSB base pate by using E0 glue, then attaching one layer of impregnated paper decorative surface layer on the surface of the OSB base plate; or the step b, compositing by using a repeated attaching mode: compositing the veneer which is 0.1-3.0mm thick and the impregnated paper to manufacture a paper board composite decorative surface layer, and gluing the paper board composite decorative surface layer to the OSB base plate by E0 glue. The furniture plate has a painting-free function, and has the excellent performances of environment friendliness, high stability, high carrying property, high nail keeping capacity and the like.

The invention relates to a two-dimensional transition metal chalcogenide crystal, and a preparation method and application thereof. The preparation method includes the following steps: (1) sequentially putting a chalcogen source and a transition metal oxide source along an airflow direction in a heating device, wherein the transition metal oxide source is coated with a molecular sieve, and a growth substrate is put on the upper side of the transition metal oxide source; (2) injecting a protective gas into the heating device, increasing the temperature until the temperature of the transition metal oxide source reaches a chemical vapor deposition temperature and the temperature of the chalcogen source reaches an elemental volatilization temperature, and performing chemical vapor deposition to obtain the two-dimensional transition metal chalcogenide crystal. The large-area uniform monolayer or multilayer two-dimensional transition metal chalcogenide crystal can be obtained by the preparation method and can be applied to polarized photoelectric detection or topological field effect transistors.

The present invention provides a magnesium alloy rare earth compound flux and its production method. Its composition includes (wt%) 40-55% of magnesium chloride, 15-25% of potassium chloride, 12-25% of sodium chloride, 1-6% of calcium chloride, 5-15% of calcium fluoride, 1-8% of barium chloride and 3-10% of rare earth activator. Said ivnention flux has high activity, proper melting point, density, viscosity and surface tension, and can greatly raise mechanical property of magnesium alloy and corrosion resistance.