10results about How to "Low bulk density" patented technology

The invention provides a superfine light-weight high-strength filler and a preparation method thereof, and belongs to the technical field of fillers. The filler is prepared from the following components in parts by weight: 30 to 100 parts of quartz sand, 1 to 10 parts of cullet, 1 to 15 parts of Al2O3, 7 to 15 parts of Li2O, 2 to 8 parts of P2O5, 1 to 12 parts of ZrO2, 3 to 6 parts of composite nucleating agent, 5 to 10 parts of carbonate, 10 to 20 parts of feldspar and 2 to 5 parts of sulfate. The preparation method comprises the following steps: mixing the quartz sand, the cullet, the Al2O3, the Li2O, the P2O5, the ZrO2 and the composite nucleating agent, melting at a high temperature to obtain a base material, nucleating and crystallizing at different temperatures, grinding, adding the carbonate, the feldspar and the sulfate, adding the binder, granulating, and sintering to obtain the product. The lightweight high-strength filler has the characteristics of sound absorption, noise reduction, fire prevention, flame retardance, light mass density, high compressive strength, low water absorption, ecological environmental protection and the like, and is suitable for lime, gypsum and cement-based products; particularly, the high-temperature-resistant and high-strength dry-mixed mortar has a good application prospect in dry-mixed mortar products, such as ceramic tile adhesives, light plastering and self-leveling, as well as acoustic boards, sound insulation barriers, heat insulation boards and fireproof board products.

The invention provides a high-speed stirring and atomization coating combined powder insulation method and insulation powder, and the powder insulation method comprises the following steps: (1) enabling the powder to be in a high-speed stirring state in a closed space, and enabling powder particles to be spheroidized; (2) while the step (1) is carried out, introducing an insulating agent into the closed space in an atomized manner, and carrying out insulating coating on the spheroidized powder particles; (3) continuously stirring after stopping introducing the insulating agent, and discharging to obtain insulating powder; wherein the rotating speed of the high-speed stirring state in the step (1) is larger than or equal to 2500rpm, and the linear speed of the powder particles in the stirring process is larger than or equal to 40m / s. According to the powder insulation method provided by the invention, the sphericity of the powder and the uniformity of insulation coating are improved, the apparent density of particles is improved, meanwhile, the technological process is simplified, the treatment cost is reduced, and large-scale popularization and application are facilitated.

The invention relates to a calcium phosphate pellet and a preparation method thereof.The calcium phosphate pellet is prepared through the following steps that calcium phosphate is ground and screened, the calcium phosphate is screened through 40-mesh, 60-mesh and 100-mesh screens respectively, and calcium phosphate powder mixtures with different granularities are obtained and marked as first materials; adding the first material and the auxiliary powder into a mixer, and uniformly mixing to obtain a second material; adding a binder into the second material, and uniformly mixing to obtain a mixture I; adding a carbon source into the mixture I, uniformly mixing, uniformly adding industrial water through a spraying device, and uniformly mixing to obtain a mixture II; pelletizing the second mixture through a material pressing machine, and then sequentially performing curing treatment, roasting treatment and cooling treatment to obtain the calcium phosphate pellets. The prepared calcium phosphate pellets are high in compressive strength and high in green pellet forming rate, the bulk density of calcium phosphate products is greatly reduced, transportation and storage are convenient, the roasting temperature in the preparation method is low, and energy consumption is greatly reduced.

The invention relates to a method for preparing stainless steel powder for sintering metal porous materials, comprising the following steps: S1: adding a stainless steel raw material into an induction furnace, adding a slag remover and a deoxidizer for smelting, and obtaining a stainless steel melt after complete smelting; S2: adding the stainless steel melt into a tundish, flowing out through a draft tube, and crushing with water at a pressure of 5-10Mpa and a temperature of 10-30 DEG C to obtain a stainless steel slurry; S3: after the stainless steel slurry is centrifugally dehydrated, it is placed in a vacuum drying furnace with a rotation speed of 3rpm-10rpm for drying, and after drying for 3H-12H, a stainless steel powder is obtained; S4: sieving the stainless steel powder to obtain stainless steel powders of different grades. The invention uses the stainless steel raw material as a source and adopts a water atomization method to prepare a stainless steel powder in a highly irregular shape, with the characteristics of low loose density and low tap density, and is conducive to the control of the porosity, pore size and distribution uniformity of the sintered metal porous material.

A method of molding a sandwich panel according to an embodiment of the present invention includes a step of providing, on one or both surfaces of an (a) core material, a prepreg or the prepreg and an adhesive as a (b) skin material. The (a) core material is a super engineering plastic foam having a Tg of greater than 200°C. The (b) skin material contains: a (b-1) epoxy resin having an average molecular weight of 1300 or more or having a trishydroxymethane-type or cresol novolac-type structure and containing, in a total epoxy resin, an amount of 70 to 100 mass% of an epoxy resin that is semi-solid or solid; a (b-2) epoxy resin containing, in the total epoxy resin, an amount of 0 to 30 mass% of an epoxy resin that is liquid; and a (b-3) curing agent.

The invention relates to foamed PGA (polyglycolic acid) as well as a preparation method, system and application thereof, the preparation method comprises the following steps: (1) performing pyrolytic reaction on polyglycolic acid under the conditions that the temperature is 230-270 DEG C and the absolute pressure is 0.1-2kPa, and ending the reaction when the reaction conversion rate of the polyglycolic acid reaches a preset value which is less than 60% to obtain a melt material; and (2) cooling the melt material at a cooling rate of 2-10 DEG C / min to obtain the solid foaming material. Compared with the prior art, the polyglycolic acid is subjected to partial pyrolytic reaction, and the residual melt material is regularly cooled to obtain the foaming material with micro holes.

The invention discloses a method for preparing low-apparent-density flaky silver powder through a turbo type sand mill, and relates to the technical field of flaky silver powder. The method comprises the following steps: preparing an anti-settling agent solution; adding the anti-settling agent solution into absolute ethyl alcohol, and stirring to obtain an anti-settling agent-ethyl alcohol dispersion liquid; adding spherical silver powder into the anti-settling agent-ethanol dispersion liquid, and stirring to obtain a spherical silver powder-ethanol dispersion liquid subjected to anti-settling pretreatment; adding a dispersing agent into the spherical silver powder-ethanol dispersion liquid subjected to anti-settling pretreatment, and stirring to obtain a to-be-ground material; and a turbo type sand mill is adopted for grinding the to-be-ground material to obtain flake silver powder-ethanol dispersion liquid, then the flake silver powder-ethanol dispersion liquid is dried and screened, and the flake silver powder is obtained. The flaky silver powder prepared through the method has the advantages of being low in apparent density, good in oxidation resistance and good in matching performance with a silver paste organic system.

This invention belongs to the field of dialysis powder preparation, specifically relating to a porous, fast-dissolving sugar-containing dialysis powder and a method for preparing the porous, fast-dissolving sugar-containing dialysis powder based on freeze-drying spray. The method includes the following steps: (1) concentrating the sugar-containing dialysis solution to obtain a concentrated solution; (2) atomizing the concentrated solution and freezing the resulting atomized droplets to obtain solid ice crystal particles; (3) sublimating and drying the solid ice crystal particles under reduced pressure to obtain the porous, fast-dissolving sugar-containing dialysis powder. This dialysis powder is prepared using a specific freeze-drying spray technology, possessing the characteristics of porous particles, uniform composition, and rapid dissolution, while significantly reducing transportation volume and cost.

The present invention relates to catalyst preparation technology, and discloses a spherical titanium silicon molecular sieve catalyst, a preparation method and application thereof. The preparation method of the spherical titanium silicon molecular sieve catalyst comprises the following steps: a first raw material powder, a binder and a surfactant are subjected to a first mixing and granulation to form a molecular sieve wet ball; the molecular sieve wet ball is subjected to a second mixing and granulation with a second raw material powder, followed by drying and roasting; wherein the first raw material powder and the second raw material powder are titanium silicon molecular sieves, respectively. The present invention also provides the application of the spherical titanium silicon molecular sieve catalyst in the preparation of propylene oxide. The preparation method of the catalyst provided by the present invention is simple to operate, easy to control the particle size of the spheres, and has less specific surface area loss, better strength and excellent catalytic performance.

The invention relates to a method for preparing ethylene and propylene by catalytic cracking of light hydrocarbon with a tubular fixed bed reactor, the tubular fixed bed reactor comprises a shell, a plurality of longitudinally arranged tube bundles are arranged in the shell, and the tube bundles are filled with a catalyst special for catalytic cracking. A gaseous light hydrocarbon raw material mixed with diluent gas is preheated and then enters a tube bundle from a reactor tube pass inlet for a catalytic cracking reaction, compressed high-temperature gas is adopted as a heat source to provide heat for the catalytic cracking reaction, and the compressed high-temperature gas enters the reactor from a reactor shell pass inlet for convective heat transfer; the tube bundle and the internal temperature of the tube bundle are maintained at the reaction temperature of catalytic cracking, and the tube bundle is discharged from a shell pass outlet of the reactor for cyclic utilization after heat exchange. The process method provided by the invention has the advantages of high heat supply efficiency, high ethylene and propylene selectivity, long catalyst service life, simple process flow, easy operation, low equipment cost and the like.