358results about How to "Low apparent density" patented technology

The invention provides a mutually-embedded ecological building block retaining wall and a construction method thereof, and belongs to the field of buildings. The mutually-embedded ecological building block retaining wall is formed by two or more than two layers of mutually embedded ecological building blocks which are arranged transversely side by side and stacked upwards; each of the mutually embedded ecological building blocks has a front surface of the building block and a back surface of the building block which are parallel to each other; a hole is formed in the middle part of the building block; a groove is formed on the top part of the building block; the front surface of the groove and the back surface of the groove are respectively parallel to the front surface of the building block and the back surface of the building block; a bump is arranged on the bottom part of the building block; the groove is matched with the bump in size; and the bump of the building block on the upper layer is embedded into the groove of the building block on the lower layer. The construction method comprises the following steps of: placing a building block on a construction foundation to serve as a first layer; placing a building block on the first layer building block to serve as a second layer, wherein the bump on the bottom part of the second layer building block is completely embedded into the groove of the first layer building block; and repeatedly placing the building blocks to a designed height. Grass-like vegetation and vine-like plants can be grown in openings of the building blocks and gaps among the building blocks, so that a good ecological effect is achieved.

A method for manufacturing tobacco sheet taking substrate as a carrier through a dry paper making method comprises the following steps: spraying slurry onto the right side of the substrate through a high pressure spraying method, and meanwhile carrying out negative pressure suction across a wire belt to the reverse side of the substrate; then sending the substrate into an oven and carrying out medium temperature baking and humidity discharging under the condition that the temperature of the substrate is 55 DEG to 70 DEG, and enabling hot air inside the oven to flow directional from the right surface of the substrate to the reverse surface of the substrate to carry out humidity discharging; sequentially, carrying out normal temperature humidity discharging treatment; setting medium temperature baking and humidity discharging time and the normal temperature baking and humidity discharging alternatively; and repeating the steps on the reverse side of the substrate, namely a tobacco sheet is prepared. The substrate is prepared by that scattered material is evenly paved and absorbed onto a formation fabric for dry paper making to form a fiber thin layer under the vacuumpumping of a vacuum air pumping device under the formation fabric, and carrying out antistatic-electricity treatment; and spraying adhesion agent onto a fiber thin layer, under the combination of mist spraying and vacuum take-off on sprayed back surface; and finally carrying out drying.

The invention discloses a preparation method of three-dimensional porous hexagonal boron nitride. The preparation method comprises steps as follows: step one, a precursor is placed into a crucible, wherein the precursor comprises a nitrogen source and a boron source, the nitrogen source is one or more of ammonia, urea, sodium azide, pyridine, melamine and ammonia borane, and the boron source is one of boron powder, boron oxide, boric acid, ammonium borate, sodium borohydride, boron carbide and ammonia borane; step two, the crucible is placed in a high-temperature furnace, vacuum pumping is performed to 1-40 Pa, gas is introduced and oxygen is eliminated; step three, the temperature is increased to 900-1,600 DEG C in 10 min-4 h, and a reaction is performed for 0.5-5 h; and the temperature is reduced to the room temperature, and three-dimensional porous hexagonal boron nitride is obtained. The preparation method of three-dimensional porous hexagonal boron nitride is simple in technology, complex raw material pretreatment and follow-up treatment are not needed, the repeatability is good, batch preparation can be achieved, and industrialized application is easy to achieve.

A process for preparing the hydrophobic SiO2 aero-gel from rice husk ash includes such steps as burning rice husk to obtain its ash, extracting its hydro-gel in inorganic strong-alkaline aqueous solution, neutralizing by inorganic strong acid, laying aside to generate SiO2 hydro-gel, filter, acid treating, ageing, water washing, displacing the water from the hydro-gel by organic solvent, supercritical drying and modifying surface. Its advantages are high specific surface area and pore volume, and low apparent density.

The invention discloses a method for manufacturing remanufactured tobacco base sheets with a dry paper-making method. The method comprises the steps as follows: raw materials including cabo and plant fibers are ground and broken into short fibers, and then fed by wind into a forming head box for breaking up; by the aid of the vacuum pumping action of a vacuum evacuating device under a forming net, the broken-up materials are uniformly laid and adsorbed on the forming net for dry paper-making, so that a thin fiber layer is formed; the thin fiber layer is sprayed with an adhesion agent, and a manner combing mist spraying and vacuum drawing of a prayed back surface is adopted; finally the materials are dried and the tobacco base sheets are obtained; an antistatic rope is laid between the forming net and the forming head box and/or between the forming net and an opening of a vacuum box; or/and an antistatic net is arranged between the forming net and the opening of the vacuum box; the adhesion agent comprises chitosan and the like; and the remanufactured tobacco base sheets having higher wet strength stretching-resistant capacity and filling value and good processing performance are prepared with the dry paper-making method successfully for the first time.

The invention discloses a cast-in-situ straw/ash magnesium oxychloride cement wall and a construction method. The straw/ash magnesium oxychloride cement wall is obtained by processing straw, ash, light burned magnesia, magnesium chloride and the like and performing in-situ casting under the action of a modifier. The straw/ash magnesium oxychloride cement wall comprises the following raw materials in percentage by mass: 45 and 60 percent of magnesium oxide, 25 to 40 percent of solution of magnesium chloride, 2 to 20 percent of straw, 5 to 15 percent of ash and 0.5 to 2 percent of modifier. When the wall is cast in situ, the magnesium oxide, the solution of magnesium chloride, the straw, the ash and the modifier are mixed and stirred, and water is added into the mixture according to the water absorption of the straw to perform one-time forming through in-situ casting after the mixture is stirred uniformly. The wall is characterized in that the doping volume of the straw can be changed according to design requirements, and the straw can be used as inner and outer partition plates; the binding power is strong, so the adhesion process of the cast-in-situ wall materials and the conventional wall materials is avoided; due to the addition of the straw, the volume weight of products is reduced and the heat-insulating and heat-shielding performance of the products is improved; and a large amount of waste material ash, straw and the like is utilized to relieve the environmental burden effectively and reduce the cost, so the wall has great economic and social benefits.

The invention relates to the technical field of functional and differentiated fiber production, and aims to provide flexible and heterogeneous nylon-6 fiber and a preparation method thereof. The flexible and heterogeneous nylon-6 fiber is formed by V-shaped jet micropore spinning and a melting spinning method by using fiber-level nylon-6 chips as substrates; the internal part of the section of the flexible and heterogeneous nylon-6 fiber is hollow, and the periphery of the section is triangular; and the relative radial profile degree of the cross section of the flexible and heterogeneous nylon-6 fiber is 20 to 30 percent, and the relative section profile degree is 35 to 55 percent, and hollowness of the flexible and heterogeneous nylon-6 fiber is 10 to 30 percent. The fiber has good mechanical properties, and high elasticity, hygroscopicity and heat retention, and can be widely used for the fields of underwear, socks, clothing and the like.

The invention discloses a production method of ultralow density high-tenacity high-elasticity melamine foams, which comprises the following steps: using melamine formaldehyde resin or modified melamine formaldehyde resin as a base material, and adding an emulsifier, a foaming agent, a curing agent and molecules with an enhanced Marangoni effect; and after uniform emulsification, heating in a microwave oven, curing for a while, and molding. During the microwave foaming process, the addition of the molecules with an enhanced Marangoni effect not only can reduce the use amount of the foaming agent to a large extent, but also can regulate the aperture and the length-diameter ratio of edges of the foams in a large range, so as to greatly improve the various properties of melamine foams.

The invention relates to a sintered light-weight environment-friendly brick produced from electroplating sludge and a manufacture method thereof. The sintered light-weight environment-friendly brick is characterized by being prepared by adopting electroplating sludge, base waste sludge, furnace slag, refuse ash, calcium oxide, calcium sulfate, sodium carbonate, boric acid, ferrous sulfate, magnesium sulfate, Li macromolecular heavy metal trapping agent and water are adopted as raw materials; and the manufacture method comprises the following steps of: mixing and stirring the raw materials in a biaxial mixer to be in a moisture state; extruding into rectangular bars by a vacuum sludge extruder; cutting and forming by a blank cutter; manufacturing light-weight environment-friendly brick blanks of electroplating sludge under the pressure of 20-30 MPa; and conveying the formed and naturally dried light-weight environment-friendly brick blanks into a tunnel kiln to roast and manufacture light-weight environment-friendly brick products. Air laying bricks and pavement bricks in different specifications can also be manufactured by the raw materials of the invention, and the product has the advantages and the effects of light weight, great strength, zero pollution, low cost and good benefits.

The invention provides a preparation method of a porous hydrophobic oleophylic sponge. The method comprises the steps: taking polymer foams, placing in a heating furnace, under the protection of inert gas, heating up to 150-1000 DEG C, calcining for 0.2-10 h, and thus obtaining the porous hydrophobic oleophylic sponge. The porous hydrophobic oleophylic sponge obtained by the method adsorbs oil, does not adsorb water, can adsorb the oil or organic matters which are hundreds of times heavier than the sponge, and has good toughness; and after the oil or organic matters are adsorbed, the adsorbed oil or organic matters can be removed through extrusion, distillation, burning and other methods, and thus the porous hydrophobic oleophylic sponge can be used repeatedly. The preparation method is simple, needs no complicated chemical reactions or material preparation processes, and has the advantages of convenient operation, good repeatability and easily industrialized implementation. The porous oil-adsorption sponge has the characteristics of large specific surface area, low density, good flexibility, hydrophobic oleophylic performance and the like, can be used for oil-water separation, and has good application prospects in the fields of wastewater treatment, adsorption of leaking crude oil or organic matters and the like.

The invention discloses a recycled concrete brick and a preparation method thereof. Every cubic meter of the recycled concrete bricks is prepared from the following raw materials in parts by weight: 365-385 parts of cement, 710-750 parts of sand, 669-709 parts of gravel, 446-486 parts of recycled aggregate, 120-140 parts of water and 1.8-2.2 parts of solvent-type water reducing agent when the substitution rate of the recycled aggregate is 35-45%; or 375-395 parts of cement, 720-760 parts of sand, 436-476 parts of gravel, 679-719 parts of recycled aggregate, 125-145 parts of water and 1.7-2.0 parts of solvent-type water reducing agent when the substitution rate of the recycled aggregate is 55-65%. The method for preparing the recycled concrete brick comprises the following steps: preparing the recycled aggregate, premixing the raw materials, mixing at high speed, carrying out vibration demolding, and curing. The invention has the advantages of high compression strength, high folding strength, favorable use functions, flexible assembly mode, high construction waste utilization ratio, high substitution rate of recycled aggregate, and low production cost, and thus, has favorable popularization prospects.

The invention discloses a type of construction slurry for rotary pile drilling. The slurry is a type of compound slurry comprising water, bentonite, hydroxypropyl methyl cellulose solution, clay and soda ash. The construction slurry provided by the present invention can be widely applied in fields of well drilling, rotary pile drilling, and underground diaphragm wall. During a preparing process, the slurry can be mixed quickly and well. The slurry also has advantages of high efficiency, low pollution, low energy consumption and low cost.

The invention relates to a reinforced cement foaming board and a preparation method thereof. The reinforced cement foaming board comprises the following components in percentage by weight: 27.00-35.50% of water, 28.0-61.0% of Portland cement, 0-32.70% of coal ash at grade I or a mixture of coal ash and recycled filler, 0-2.00% of wollastonite powder, 0.10-0.30% of fiber, 0.37-0.65% of ammonium stearate, 1.00-2.00% of a mixture of 10 parts of calcium sulphate and 1 part of calcium formate, 0.10-0.20% of naphthalenesulfonate formaldehyde condensation compound, 0.90-1.20% of hydrogen peroxide and reinforcement net. The reinforced cement foaming board provided by the invention has the advantages of low apparent density, low heat conductivity coefficient, good noise reduction effect, high strength, no crack and shock resistance.

The invention relates to concrete and a preparation method, in particular to Waste rubber powder mixed model steel fiber reinforced lightweight aggregate concrete and preparation method thereof. The concrete per cubic meter is made of raw materials comprising, by weight, 14%-25% of cement, 0.1%-0.6% of model steel fibers, 0.03%-1.75% of rubber powder, 22%-45% of fine sand, 27%-50% of fly ash ceramsite, 6%-12.9% of net water content and 0%-0.03% of water reducing agents. The old rubber powder and the model steel fibers are mixed into the lightweight aggregate concrete, so that performance advantages of two kinds of materials can be given to full play, on the other hand, the old rubber powder is added in the model steel fiber reinforced lightweight aggregate concrete, vibration energy can be more effectively absorbed, impact performance and bend toughness of the lightweight aggregate concrete can be enhanced remarkably, and meanwhile, frost resistance, corrosion resistance and abrasion resistance of the model steel fiber reinforced lightweight aggregate concrete can be improved.

[Summary]

[Problems] To provide extremely-spherical-three-dimensional-shaped particles of crystalline mannitol containing large hollows and gaps inside.

[Solution] Spherical particles of crystalline mannitol made by spray drying, extremely spherical (having an aspect ratio of 1.0 to 1.2), high oil absorption rates according to test method A, wherein powder has a mean particle diameter of 15 to 165 μm, a loose bulk density of 0.35 to 0.60 and an angle of repose of 30 to 50 degrees, and has a hardness of 7 to 20 kgf, when directly compressed.

The invention discloses a straw/ash magnesium-oxy-chloride cement hollow slat or hollow building block and a preparation method thereof. The preparation method comprises the steps of: firstly, adding a modifying agent into an MgCl2 solution prepared by a normal bittern's slice to be stirred uniformly, wherein the mass ratio of MgO to MgCl2 is 5:1-6:1, the ash accounts for 10-30 percent by mass of the MgO and the modifying agent accounts for 0.5-2 percent of MgO; secondly, mixing and stirring with uniformly stirred MgO powder and ash to obtain a magnesium-oxy-chloride cement gelled material; thirdly, adding straw fibers into the magnesium-oxy-chloride cement gelled material according to the proportion that the straw fibers account for 10-40 percent of the total volume of the straw fibers and the magnesium-oxy-chloride cement gelled material, uniformly stirring by adding water until the fluidity of a mixture reaches 110-140 mm according to the straw water absorption, and die-filling, vibrating and molding or reducing the water to binder ratio and then pressurizing and molding to obtain the straw/ash magnesium-oxy-chloride cement hollow slat or hollow building block after slurry shows better fluidity. The invention has good watertightness, high strength, good temperature and heat insulating effect, resource saving and environment load reduction.

The invention belongs to the technical field of building materials, and particularly relates to an autoclaving-free light ultra-high-performance concrete and a preparation method thereof. The ultra-high-performance concrete without high-temperature steam curing or autoclaved curing has the advantages of excellent working performance, low density, ultra-high strength, good volume stability and thelike, the durability of a concrete structure is improved, the problems of large size and dead weight and difficulty in transportation and hoisting of a prefabricated assembly bridge member in currenturban traffic construction can be solved, and the concrete has important practical application values. The preparation method and a construction technology are simple and easy in operation and have practical popularization values. Optimal gradation of the maximum compactness and ceramsites of a cement-silica fume-coal ash ternary system is achieved by the aid of a maximum stacking density theory,cement serves as a base material, silica fume serves as a densification component, coal ash serves as a modifier, the strength of the concrete is effectively improved by steel fibers, and micro-crackextension is delayed.

The invention discloses an EPS foam article which comprises an EPS raw material and a foaming agent; and the mass of the foaming agent is 4.5-7.2% of that of the EPS raw material. The invention further discloses a production technology of the EPS foam article. The production technology comprises the following steps of S1, stock preparation, S2, heating, S3, pre-foaming, S4, curing, S5, moulding, S6, cooling, S7, drying and S8, aftertreatment. The EPS foam article is low in apparent density and high in flexural strength, is of a closed cell structure internally provided with a large number of fine air bubbles and is long in service life. The production technology of the EPS foam article is stable and simple in technological process; the cooling is carried out through a cooling system, so that manual operation is reduced, the cooling effect is good, and the drying time is shortened; cooled water is subjected to settlement by a settling pool, so that pipe clogging is avoided; and the water is softened by water treatment equipment, so that a mould of a forming machine is effectively protected, the service life of the mould is prolonged, the maintenance cost is reduced, and the rate offinished EPS foam is raised.

A rubber modified solidifying soil comprises the following components by weight percentage: 1 to 20 percent of rubber material, 3 to 35 percent of gelled material, 40 to 95 percent of soil and 0 to 5 percent of water. The rubber modified solidifying soil is formed by mixing soil, gelled material and rubber material with water and stirring and solidifying the mixture. The preparation and construction method comprises the steps as follows: (1) the water content of the engineering soil is measured; (2) the optimal water content of soil is defined; (3) the water content is adjusted; (4) the adopted gelled material is mixed evenly; (5) the soil with the adjusted water content by the step (3) which reaches the optimal or approaches the optimal is mixed with the gelled material and rubber material according to the designed weight percentage of the components, and then water is added into the mixture and then the obtained mixture is stirred evenly, and then the mixture is paved and rolled for shaping; after shaped, water is scattered on the obtained soil for maintaining. The solidifying soil of the invention has higher toughness, anti-shrinking and anti-crack capability and fatigue resistant capability, the apparent density is reduced and simultaneously, the waste rubber is utilized again; the economic and environmental benefits are better and the application field is wide.

A process for producing a polytetrafluoroethylene fine powder including: (1) a step of preparing an aqueous dispersion containing polytetrafluoroethylene, water and a surfactant (A); (2) a step of initiating coagulation of the polytetrafluoroethylene in said aqueous dispersion by agitating said aqueous dispersion; (3) a step of adding a surfactant (B) after the step (2); (4) a step of terminating coagulation after the step (3); (5) a step of collecting a wet powder of the polytetrafluoroethylene; and (6) a step of drying the wet powder of the polytetrafluoroethylene.