399results about How to "High compressive strength" patented technology

An environmentally friendly, commercially practicable process for the production of microcellular polymer foams from amorphous, semi-crystalline and crystalline polymers that comprises consolidating the polymer into a polymer shape, saturating the polymer shape with an inert gas at elevated temperature, above the Tg of the polymer, and under elevated pressure, releasing the pressure and cooling, i.e. quenching, the saturated polymer polymer shape under controlled temperature and pressure conditions to produce either a closed or open celled, low to medium density microcellular foam or a closed cell, high density microcellular foam.

A soy-based polyol is mixed with an isocyanate and aggregate to produce a soy-based polyurethane having superior mechanical properties. The aggregate composition may be varied to obtain different mechanical properties, as can the amount of resin. The resin may be crosslinked using a low molecular weight polyol, such as glycerine, to also improve structural performance. A catalyst may be added to accelerate curing time without reducing structural performance.

Moldable-foam moldings whose density is in the range from 8 to 200 g/l, obtainable via fusion of prefoamed foam beads composed of expandable pelletized filled thermoplastic polymer materials, and a process for preparing the expandable pelletized polymer materials.

The invention provides a high-strength nanometer composite high-molecular dual-network hydrogel and a preparation method thereof, and belongs to the technical field of composite modification of hydrogels. The preparation method of the high-strength nanometer composite high-molecular dual-network hydrogel comprises the following steps of: firstly dissolving a first network monomer, a cross-linking agent and an initiating agent into a water dispersion liquid which contains nanometer particles, and pouring an obtained mixed solution into a mould for heating polymerization to obtain a first network hydrogel; dissolving a second network monomer, the cross-linking agent and the initiating agent into water, placing the first network hydrogel into the solution, swelling for 24 hours, and then carrying out the heating polymerization to obtain the high-strength nanometer composite high-molecular dual-network hydrogel. The high-strength nanometer composite high-molecular dual-network hydrogel provided by the invention is simple in preparation process and superior in property, can be used for enhancing the compression strength of the dual-network hydrogel and keeping higher tensile strength through nanometer enhancement and is widely applied to the fields of biological medicine, agriculture, a building industry, a chemical industry, a mining industry, and the like.

The invention discloses a stone aggregate wrapped by a microfine fibre polymer mortar thin layer and a preparation method thereof; the stone aggregate is formed by stone aggregate inner cores, an adhesive inner wrapping layer, a polymer cement mortar outer wrapping layer and an adhesive microfine fibre hair layer, wherein the adhesive inner wrapping layer and the stone aggregate are adhered firmly; microfine fibre filaments are anchored and rooted on the adhesive inner wrapping layer; and the polymer cement mortar outer wrapping layer and the adhesive inner wrapping layer are soluble mutually and can effectively form a whole body. Active powder in the polymer cement mortar outer wrapping layer contains silica fume, zeolite powder, finely-ground mineral slag, pulverized coal ash and the like, and can generate volcanic ash reaction with Ca(OH)2 crystal at the interface position of the set cement so as to generate gelled materials, and further carry out improved treatment on the weakest interfaces of set cement and the stone aggregate in concrete. The modified stone aggregate of the invention has good affinity with the set cement, and has higher binding power with the set cement.

A layered composite has at least one decorative surface and comprises a backing layer made from a thermoplastic polymer which is not polypropylene, a decorative layer arranged thereupon and a heat-cured layer applied to the decorative layer. An intermediate layer may also be inserted as bonding material between the backing layer and the decorative layer. The decorative layer and the heat-cured layer may also be applied to both sides of the backing layer.

The invention discloses a method for preparing sintered ore by using a high-chromium-type vanadium-titanium mixture, belonging to the technical field of metallurgy. The method comprises the following steps: (1) preparing high-chromium-type vanadium-titanium magnetite concentrate, iron ore powder and return mine to serve as raw materials, screening one part with the granularity of less than 0.106mm to serve as fine aggregate, and taking the rest part as coarse aggregate; (2) weighing a part accounting for 20-80 percent of the fine aggregate to serve as a mini-pellet raw material, and mixing with quick lime and coke powder, thereby obtaining the mini-pellet material; (3) taking the rest fine aggregate and all the coarse aggregate as the mixed raw materials, and mixing with quick lime, limestone, magnesite ore and coke powder, thereby obtaining the mixed materials; (4) preparing the high-chromium-type vanadium-titanium mixed materials; (5) distributing in a sintering machine while controlling the distribution thickness at 600-800mm, igniting, exhausting air and sintering; and (6) crushing and screening, thereby obtaining the product. According to the method disclosed by the invention, one part of materials with the granularity of less than 0.106mm can be prepared into mini pellets, so that the product has high compressive strength, and when the height of the sintered mixture layer is increased, the breathability of the sintered mixture layer is not reduced.

The invention discloses an insulation system with polycrystalline insulation mortar, which belongs to the technical field of the building material. The insulation system comprises interface mortar, insulation mortar and waterproofing mortar, wherein the insulation mortar comprises the following components: cement, redispersable latex powder, cold water type polyvinyl alcohol, hydroxypropyl-methylcellulose ether, air entraining agents, sodium silicate, inorganic retarder and polystyrene particles. Compared with the prior art, the invention has the following advantages of: 1, solving the problem that the bonding strength of the inorganic cementitious material for penetration is not sufficient, and significantly improving the bonding strength and the compressive strength of the whole insulation system; 2, improving the construction property of the material and the insulation effect of the system; 3, improving the construction property and enhancing the long-term strength of the product;4, improving the waterproofing function of the system, and changing the rigidity of various kinds of polycrystalline mortar into softness, thereby improving the impact resistance, bending resistance,tensile strength, shrinkage resistance and other strain capacities of the insulation system; and 5. improving the bending resistance and the tensile strength of the material and the physical anti-cracking performance of the system.

The invention discloses a high-molecular soil curing agent, and belongs to the building material technology field. The high-molecular soil curing agent is prepared from the following components, by weight, 4-8 parts of ordinary portland cement, 35-45 parts of binding agent, 15-25 parts of reinforcing agent, 4-6 parts of early strength agent, 4-9 parts of waterproof agent, 7-9 parts of filling agent, 2-4 parts of water reducer, 0.3-0.7 part of surfactant, 4-6 parts of dispersant and 0.01-0.03 part of air entraining agent. The soil curing agent has advantages of reasonable formula, large penetration depth (18mm), large compressive strength (the 7-day unconfined compressive strength is 12.42MPa), and high water resistance (the 7-day immersion water absorption is 0.86%), and can be applied to engineering of roads, railways, subways and the like.

A roller mill for comminuting brittle grinding stock comprises at least one grinding roller constructed as a loose roller and rotatable about an axis and interacting with a counter-surface such that grinding stock is comminuted between the grinding roller and counter-surface. Horizontally slidable bearing blocks bear the grinding roller and are guided in a frame rotatably about a vertical bearing axis. A pressing device applies an adjustable grinding pressure to the grinding roller via the bearing blocks. At least two resilient compensation elements are associated with each bearing block in order to compensate a skewed position and/or deflection of the grinding roller. The compensation elements are arranged between the frame and the bearing blocks, and, in the plan view of the roller mill, are arranged tangentially to a circle around the vertical bearing axis or constructed in a circular arc around the vertical bearing axis.

There is provided a honeycomb structure and a method for producing the honeycomb structure, capable of reducing variance in pore diameter depending on part and capable of increasing the mean pore diameter as a whole. There is provided a method for producing a cordierite honeycomb structure 1 including the step of firing a honeycomb formed body. In the firing step, a temperature rise rate from 1200° C. to 1250° C. is controlled to 40° C./hr or more, a temperature rise rate from 1250° C. to 1300° C. is controlled to 2 to 40° C./hr, and a temperature rise rate from 1300° C. to 1400° C. is controlled to 40° C./hr or more. There is further provided a honeycomb structure having a porosity of 50 to 70%, a mean pore diameter of 15 to 30 μm, a difference in a mean pore diameter of 5 μm or less between in the central portion and in the outer peripheral portion, a thermal expansion coefficient of 1.0×10⁻⁶/° C. or less in each of the central portion and the outer peripheral portion, and an A-axis compression strength of 1.5 MPa or more in each of the central portion and the outer peripheral portion.

The invention discloses a power battery cooling system based on a core-cladding-structure composite phase-change heat storage layer. The power battery cooling system comprises a system shell, battery unit modules, heat storage modules, an upper cover plate and a lock screw, wherein the battery unit modules and the heat storage modules are distributed in the shell in a layered and staggered manner, and the upper cover plate and the lock screw are used for realizing assembling and positioning; each heat storage module wholly adopts a core-cladding structure and comprises an outer sealing shell and a composite phase-change material, the outer sealing shell is positioned at the outer layer of each module and made of a high polymer material, the inner chamber of the outer sealing shell is filled with the composite phase-change material in a vacuum manner, and the composite phase-change material is formed by mixing a heat conduction material and a paraffin type phase-change material; the curing temperature of the high polymer material is set to be higher than the phase change temperature of the composite phase-change material, and a certain vacuum clearance is retained in the inner chamber of the outer sealing shell made of the high polymer material for the composite phase-change material. According to the power battery cooling system, the heat storage modules which are convenient to operate and control and can circularly charge and discharge heat. Compared with the prior art, the power battery cooling system effectively solves the problems of difficult sealing and expansion pressure likely caused by the phase-change material.

Poles of this invention have an annular body with a wall structure comprising a number of fiber reinforced resin layers, which can be positioned to form an inside and/or outside portion of the wall structure. A portion of the layers are oriented longitudinally within the wall structure, and the wall structure also includes radially-oriented fiber reinforced resin layers. The pole includes one or more layers or a core of a composite material or polymer mortar disposed within one or more locations of the wall structure, e.g., as an intermediate layer and/or as part of the wall inside and/or outside portion. The pole can include an outside surface resistant to ultra violet radiation. Poles of this invention can be formed using a continuous process on a rotating mandrel, making use of differently positioned stations to form the different portions of the pole as the fabrication is moved axially along the mandrel.

The invention discloses a cellulose-reinforced polyurethane/epoxy resin interpenetrating polymer network hard composite foam material and a preparation method thereof, relates to a foam material and a preparation method thereof and aims at solving the problems that existing polymer formed through mutual interpenetrating of two types of polymer, namely polyurethane and epoxy resin, is poor in sound absorption property and low in mechanical property. The sound absorption property of the composite foam material ranges from 80% to 92%, and the composite foam material is prepared from polyether polyol, isocyanate, water, a foaming agent, foam stabilizer, initiator, hydrosol of nano-crystalline cellulose with the mass percentage being 1%, chain extender, a cross-linking agent and epoxy resin. The preparation method comprises the steps of firstly, mixing the polyether polyol, the foam stabilizer, the initiator, the foaming agent, the chain extender and the water with cellulose obtained after pretreatment, then adding the epoxy resin and the cross-linking agent, and obtaining a mixture; then mixing the isocyanate with the mixture, conducting stirring till bubbles are generated, leaving the mixture standing still, obtaining a foamed mixture, finally, conducting curing on the foamed mixture at the room temperature, and then conducting curing at the high temperature.

The invention discloses a prestressed bridge connection device and a prefabrication method and construction method thereof. The prestressed bridge connection device includes a connecting plate main body formed by pouring ultra-high performance concrete, and is characterized in that the inside of the connecting plate main body is fixedly provided with at least one corrugated pipe in the longitudinal direction, the upper portion of the pipe wall of the corrugated pipe is provided with two through grouting holes, a prestressed reinforcing steel bar is inserted in the corrugated pipe, the length of the prestressed reinforcing steel bar is larger than that of the corrugated pipe, a fixing assembly for fixing the prestressed reinforcing steel bar is arranged between the prestressed reinforcing steel bar and the connecting plate main body, and the connecting plate main body is provided with a plurality of transverse connection reinforcing steel bars extending out of the two transverse ends of the connecting plate main body and a plurality of longitudinal connection reinforcing steel bars extending out of the two longitudinal ends of the connecting plate main body; the two transverse ends of the connecting plate main body are provided with post-pouring belts used for pouring the concrete. The prestressed ultra-high-performance concrete bridge connection device has the advantages of cracking prevention and crushing resistance, driving is thus stable and comfortable, and service life of a bridge surface continuous structure is prolonged.

The invention provides a polyurethane grouting material and a preparation method and application thereof, and discloses a polyurethane compound used for grouting and the preparation method and application thereof. The polyurethane compound is composed of a component A and a component B. The component A is prepared from the materials: polyether polyol, amine-based polyols, epoxy resin, foaming agents, toughening agents, phase-change materials, reactive diluents, compatilizers and retarders; and the component B is polyisocyanate. The polyurethane grouting material has the characteristics of goodtoughness, excellent bonding effect, being capable of cooling, self-catalyzed and having oleophylic and hydrophile grouting, can be applied to clearance, cracking and slurry spurting of a pavement base of a highway tunnel and disease repair of clearance and sinking of bridge engineering access boards, can be further used for water conservancy power facilities, mineral resource mining, undergroundand submerged structure engineering waterproof treatment, maintenance and reinforcing and fault repair treatment of water leakage and water permeable.

The invention discloses a cement-based self-leveling mortar, comprising the following constituents by weight ratio: 200-450 parts of silicate cement, 50-100 parts of high-alumina cement, 350-500 parts of quartz sand, 100-250 parts of ground limestone, 30-100 parts of anhydrite, 0.5-2 parts of antifoaming agent, 3-10 parts of water reducing agent, 10-50 parts of redispersible emulsion powder, 0.5-3 parts of tartaric acid, 0.3-2 parts of lithium carbonate, 0.3-2 parts of methylcellulose and 3-10 parts of ethylene glycol. For the cement-based self-leveling mortar prepared by the invention, the 20min fluidity is more than 130mm, the 24h compressive strength is more than 6.0MPa and the breaking strength is more than 2.0MPa, the indexes all meet the national industry standard.

The invention discloses an inorganic foam heat insulting material with a second-grade closed-pore structure. The inorganic foam heat insulating material is prepared by hollow balls (hollow microsphere), gel material, fibers, a foaming agent, a reinforcing agent, a water repellent and water based on the proportion by weight of (70 to100): (35 to 80): (0 to 5): (0.1 to 2.5): (0 to 12): (0 to 5): (76 to 154). The inorganic foam heat insulating material prepared by the materials mentioned above has a second-grade closed-pore structure, so that relatively high heat insulating performance is achieved; the inorganic foam heat insulating material has the dry apparent density of 100 to 500kg/m<3>, compressive strength of 0.2 to 3.0MPa, and thermal conductivity of 0.020 to 0.080W/(m.k), and has the characteristics of incombustibility, low density, good heat insulating performance, capacity of absorbing sound and reducing noise, and low comprehensive cost, is convenient to construct, and uses a large number of solid wastes. The inorganic foam heat insulating material can be widely applied to the fields of building heat insulation and industrial heat insulation, and also can be widely applied to preparing inorganic hollow ball foam products; and the inorganic foam heat insulating material has high value in actual application.

The invention discloses a polycrystal flexible tile joint mixture. The polycrystal flexible tile joint mixture comprises cement, bauxite cement, quartz sand, redispersible latex powder, organosilicone water repellent, hydroxymethyl propyl cellulose ether, coarse whiting and bentonite. The polycrystal flexible tile joint mixture has high bonding strength, has microdilatancy function, can effectively resist production of shrinkage cracks in construction, and prevents leakage.

Provided are a steel pipe for a linepipe having a heavy wall thickness and excellent fracture toughness in a base material, and methods of producing the same. A welded heat affected zone is achieved by suppressing lowering of yield stress caused by a Bauschinger effect by optimizing the metal microstructure of a steel plate. A steel pipe has a composition which contains by mass % 0.03 to 0.08% C, 0.10% or less Si, 1.00 to 2.00% Mn, 0.010% or less P, 0.0030% or less S, 0.06% or less Al, 0.005 to 0.020% Nb, 0.005 to 0.025% Ti, 0.0010 to 0.0060% N, and Fe and unavoidable impurities as a balance. Ti(%)/N(%) is a value which falls within a range of 2 to 4, and a Ceq value is 0.30 or more.

The invention relates to a continuous fiber reinforced polyolefin composite tube and a preparation technology thereof. The continuous fiber reinforced polyolefin composite tube comprises an inner layer plastic tube; an internal heating glue-smelting layer is arranged outside the inner layer plastic tube; a continuous fiber impregnated tape is arranged outside the internal heating glue-smelting layer; an external heating glue-smelting layer is arranged outside the continuous fiber impregnated tape; an outer layer plastic tube is arranged outside the external heating glue-smelting layer. The preparation technology is that the inner layer plastic tube is coated with the internal heating glue-smelting layer, the continuous fiber impregnated tape is preheated and then wound on the inner layer plastic tube, and is coated with the external heating glue-smelting layer, and finally, the external heating glue-smelting layer is coated with the outer layer plastic tube to obtain the composite tube, and then the whole composite tube is heated to enable the mutual fusing and connection and fixation from the inner layer plastic tube, the internal heating glue-smelting layer, the continuous fiber impregnated tape, the external heating glue-smelting layer and the outer layer plastic tube, so as to obtain the continuous fiber reinforced polyolefin composite tube. The continuous fiber reinforced polyolefin composite tube and the preparation technology enhance the compression strength of the composite tube effectively, the crushed material of the composite tube can be directly recycled, the technology is simple, the cost is low, relatively long glass fibers in the crushed material are used as a reinforcing material, and the recycled material can be used as a high-strength reinforced modified material.

This invention relates to extruded composite materials specifically focusing on the increasing load bearing capacity and the overall strength of composites. Injectable conformable structural core materials are used to replace foam cells inside extruded composite materials thereby increasing the overall load bearing stability and strength. The core materials are tailored to have a desired CTE with respect to the structural materials. The core materials may also incorporate fibers and solid structural fillers for increasing the strength of the composite member. The objective is to enable composite materials to have the highest structural load bearing capability possible so that these technologies can be used as the replacement of wood, in aerospace applications and for other purposes.

The invention relates to a method for entry retaining for walling at sides of a road in a steel cylinder support mode, which is applicable to the construction of gob-side entry retaining for a coal mine stope. The method comprises the steps of: after stopping a coal face, arranging a steel cylinder support at the edge of a gob by lagging 1-2m, and arranging a steel grid frame structure in the steel cylinder; then, pouring concrete in the steel cylinder; firmly piling the edge of the gob with waste rocks, coal cinder and the like after an overhead plate of the god collapses; spraying slurry to close the gob; and jointly forming a support wall at the sides of the road with the high-strength steel cylinder support and a waste rock wall. The restriction of the high-strength steel cylinder can obviously enhance the strength and the carrying capacity of the concrete structure. The method has the advantages of simple construction process and high adaptability, and also can save materials, reduce labor intensity and improve the construction environment.

The invention discloses a continuous extrusion deformation method of magnesium alloy, which comprises the steps that: the temperature of a homogenized magnesium alloy blank is heated to 350 to 450 DEG C, an extrusion die, with the temperature lower than that of the magnesium alloy blank by 10 to 30 DEG C, is used for performing first-pass one-way continuous extrusion at the constant-speed extrusion rate of 1m/min to 3m/min in an order of forward extrusion, change channel angular extrusion at 90-degree corner and equal channel angular extrusion at 90-degree corner, so that the magnesium alloy blank, after the forward extrusion at one end of the die, is equivalently divided into a plurality of streams, which are subject to the change channel angular extrusion and the equal channel angular extrusion to form the magnesium alloy at the other end of the die, followed by mold stripping, thus continuous flowing extrusion deformation is formed, the extrusion ratio of the forward extrusion to the change channel angular extrusion at 90-degree corner is 16:1, and the extrusion ratio of the change channel angular extrusion to the equal channel angular extrusion at 90-degree corner is 1:1. The method can not only obtain extremely prominent grain refining effect and more homogenous structure of the magnesium alloy, but can also enhance industrial production efficiency, lower production cost and ensure production quality by increasing the extrusion ratio and the extrusion speed.

The invention provides a method for enhancing a carbon fiber resin based composite material through organic modified nano-particles. The method comprises the following steps: firstly processing nano-particles by virtue of an organic modifying agent to generate amino groups on the surfaces of the nano-particles, mechanically stirring the nano-particles with low-viscosity resin components in an enhanced resin system, and carrying out uniform ultrasonic dispersion, so as to form enhanced nano-master batch; adding a nano-enhancer into the resin system in a certain proportion, compounding the resin system with carbon fibers, so as to prepare the composite material. According to the method, a nanometer effect of the nano-particles is exerted when the rigidity of the nano-particles is adequately utilized, so that the compression strength of the resin system composite material is effectively improved, and meanwhile, the system has excellent impact resistance and can be applied to the aviation market with extremely high requirements on the impact resistance of the composite material.

The invention relates to an aramid fiber reinforced 3D graphene/epoxy resin composite material and a preparation method thereof. Aramid fibers are uniformly distributed and loaded on 3D graphene, and the composite material has electrical conductivity of 102S/cm or higher and compressive strength of 115MPa or higher. The aramid fiber reinforced 3D graphene/epoxy resin composite material has high comprehensive strength and high electrical conductivity, and can be used as a conducting material or electromagnetic shielding material with good buffering capacity.

The invention relates to a vacuum interrupter (1) with at least one substantially cylindrical, electrically insulating housing part (3), which is connected in vacuum-tight fashion to a metal part (9). In this case, the metal part has been provided with a field control element (13). The field control element (13) is arranged in a cutout (5) in the housing part (3) in such a way that the field control element (13) is arranged so as to be recessed with respect to the outer lateral surface of the housing part (3) or terminates flush with the outer lateral surface.

The invention discloses a low-temperature delayed-curing sand-control proppant, a preparation method of the proppant as well as a low-temperature delayed-curing sand-control system. The sand-control proppant comprises proppant particles, wherein proppant particles comprise quartz sand and composite resin layers, and the composite resin layers comprise inner resin layers and outer resin layers; the inner resin layers are thermoplastic phenolic resin layers; the outer resin layers comprise components in parts by weight as follows: 1.0-3.5 parts of mixed resin, 0.01-0.02 parts of a resin curing agent, 0.005-0.02 parts of a silane coupling agent and 0.05-0.1 parts of a dispersant; the mixed resin is a mixture of thermoplastic phenolic resin and epoxy resin; the mass ratio of the quartz sand to the inner resin layers to the mixed resin of the outer resin layers is 100:(0.5-2.0):(1.0-3.5). The temperature resistance and the compressive strength of the sand-control proppant are improved by the aid of the composite resin layer, and the sand-control proppant can be cured at the low temperature and even the normal temperature and can be adapted to stratums at different temperatures.

The invention discloses a high-performance assembling type construction reinforcing steel bar sleeve grouting material and a using method thereof, and belongs to the technical field of building materials. The grouting material consists of the following components in parts by mass: 80 to 100 parts of cement, 0 to 80 parts of quartz sand, 10 to 100 parts of mountain sand or river sand, 5 to 15 partsof an expanding agent, 0 to 1 part of a set retarder, 0.5 to 3 parts of a water reducing agent, 0 to 1 part of a defoaming agent and 15 to 80 parts of steel slag powder. When the grouting material isused, the cement, the quartz sand and steel slag are uniformly mixed in proportion first, then 2 to 3 times of water is added slowly, the materials are stirred, the expanding agent, the set retarder,the water reducing agent and the defoaming agent are added in proportion in a stirring process, and after the materials are stirred uniformly into the grouting material, the grouting material can beused. According to the grouting material, the quartz sand is partially or completely replaced by adopting the river sand or the mountain sand, the using of complex admixtures is reduced, and industrial waste steel slag is added, so that the performance of the grouting material can be maintained, and meanwhile, the cost is greatly reduced; therefore, the grouting material is suitable to be widely applied in an assembling type construction reinforcing steel bar sleeve grouting material.

The invention discloses a concrete recycled aggregate and a preparation process thereof. The preparation process of the concrete recycled aggregate comprises the following steps: S1, crushing and six-stage screening; S2, soaking in hydrochloric acid to prepare a pretreated recycled aggregate; S3, mixing silicon dioxide, expanded graphite, bentonite and talcum powder, and mixing an obtained mixturewith water-based BOPP resin and deionized water to prepare a thermal insulation filler; S4, preparing a reinforcing filler from glass beads, calcium ion powder, glass fiber powder and acrylate; S5, performing fermentation treatment on the pretreated recycled aggregate, bacillus, quick lime and the like to obtain a fermentation product; S6, mixing the fermentation product with the crushed straw and a trimethylmethoxysilane solution, and exposing an obtained recycled aggregate to the sun; and S7, mixing the recycled aggregate with the steel slag to prepare a mixed aggregate, and then mixing themixed aggregate with an epoxy resin modified waterborne polyurethane. The concrete recycled aggregate disclosed by the invention has the advantages of low water absorption rate and small void ratio,so that the prepared concrete has high compressive strength.