420results about How to "Reduce air content" patented technology

The invention relates to a pumping agent and application thereof, belonging to the field of construction materials. The invention aims to provide the pumping agent and the application thereof. The pumping agent provided by the invention comprises 175-325 parts by weight of polycarboxylic acid water reducing agent, 10-60 parts by weight of retarder, 10-50 parts by weight of water retention agent, 0.1-1.5 parts by weight of air entraining agent and 563.5-804.9 parts by weight of water. The invention also relates to the application of the pumping agent in C15-C70 concrete. The addition amount of the pumping agent accounts for 0.9-2.2 wt% of a cementing material in the concrete. The pumping agent prepared by the invention has the advantages of favorable material adaptability, low addition amount, high water reducing rate, low air content, high concrete strength contribution and the like, mainly solves the problem that the polycarboxylic acid pumping agent is easily subjected to over-addition in practical situations, can effectively prevent the defects of the concrete such as weepage, isolation and the like, and ensures the quality of the concrete.

The invention discloses an environment friendly low-gas-content aluminum alloy ingot which comprises the following components in percentage by weight: 1.6-3.3 percent of Cu, 9.8-11.8 percent of Si, 0-0.29 percent of Mg, 0-0.08 percent of Zn, 0-0.8 percent of Fe, 0-0.48 percent of Mn, 0-0.48 percent of Ni, 0-0.1 percent of Ti, 0-0.1 percent of Pb, 0-0.2 percent of Sn, 0-0.25 percent of other trace elements and the balance of aluminum. Meanwhile, the invention also discloses a production method of the environment friendly low-gas-content aluminum alloy ingot. The environment friendly low-gas-content aluminum alloy ingot has the advantages of low gas and dreg content, high aluminum liquid cleanness and good mechanical and machining properties. The production method has the advantages of low production cost and high efficiency and effectively solves the pollution problem of the secondary aluminum industry.

The invention belongs to the technical field of concrete additives, in particular relates to a water reducing agent, and more particularly a composite polycarboxylic acid water reducing agent. The composite polycarboxylic acid water reducing agent is characterized by being prepared from the following components in percentage by mass: 8-28.6 percent of polycarboxylic acid high-performance water reducing agent, 0.5-7.36 percent of inhibiting agent, 0.001-0.15 percent of functional aid, 0.01-0.65 percent of preservative and the balance of water, wherein the total mass percentage of the components is 100 percent. The composite polycarboxylic acid water reducing agent is applied to freshly mixed concrete. After a template coated with waste engine oil or rosinate soap is dismantled, the surface of hardened concrete is smooth, air bubbles are reduced remarkably, and the construction requirement is fully met. By adopting the composite polycarboxylic acid water reducing agent, the problem of a large quantity of air bubbles on the surface of concrete, produced after the use of demolding agents such as waste engine oil or rosinate soap and the like is solved.

The invention belongs to the field of copper processing, relating to the process method of the production of copper strip material, and in addition, relating to a copper strip material continuous extrusion and continuous rolling device. The invention provides a continuous extrusion and continuous rolling method used for producing oxygen-free copper strip billet, comprising the following steps: taking the oxygen-free copper rod as a raw material to carry out continuous extrusion to obtain the copper slabs; utilizing the heat generated in extrusion to carry out continuous hot rolling on the copper slabs; and cooling the copper bandlets after hot rolling, discharging to obtain the copper strips, wherein protective gas is adopted to protect the space between the extrusion outlet and the cooling inlet. The invention combines the advantages of low content of oxygen of the upper-draw process, great deformation of the continuous extrusion method and good performance of hot rolling method; the product has the advantages of low content of oxygen, compact organization, fine grains and excellent comprehensive performance; and the process method has the advantages of short flow, less heating and annealing processes, energy saving and environmental protection and the like.

The present invention is thus directed to a cement additive which comprises a copolymer (A) obtained by polymerizing a monomer mixture (K), wherein;said monomer mixture (K) comprises a polyalkylene glycol ester monomer (I) represented by the general formula (1): a polyalkylene glycol ester monomer (II) represented by the general formula (2): and a carboxylic acid monomer (III) represented by the general formula (3):

The invention discloses a high titanium-bearing heavy slag C50 self-compacting weakly expansive concrete-filled steel tube, and belongs to the field of building materials. The concrete-filled steel tube is prepared from the following raw materials: cement, coal ash, composite expanding agent, macadam, high titanium-bearing heavy slag, a tackifying plasticity-maintaining super-dispersing additive, micron-sized modified absorbent cotton cellulose and water. The prepared concrete-filled steel tube has the characteristics of high flow state, low gas content, large strength extra coefficient and stable expansibility; the problem of poor working performance caused by application of high titanium-bearing heavy slag to concrete is solved; due to the water absorption and water releasing effect of the porous structure, the internal maintenance effect on the concrete-filled steel tube can be realized, the shrinkage compensation effect of the expanding agent on the concrete-filled steel tube is improved, the concrete-filled steel tube is weakly expansive to be suitable for jacking pouring of upper chord pipes and lower chord pipes of a concrete-filled steel tube arched bridge and a concrete-filled steel tube truss bridge, as well as high-casting pouring of a concrete-filled steel tube pier column. Therefore, the problem of disengaging caused by poor-density pouring of the concrete-filled steel tube is solved effectively.

The invention relates to a tantalum-silicon alloy sputtering target material and a preparation method thereof. The preparation method comprises the steps: (1) tantalum powder and silicon powder are mixed; (2) a mixture is loaded into a mold, and the mold is sealed; (3) the sealed mold is subjected to cold isostatic pressing treatment, and a tantalum-silicon blank is obtained; (4) the obtained tantalum-silicon blank is subjected to degassing treatment; (5) a degassed casing is subjected to hot isostatic pressing treatment at 1050-1350 DEG C, and a tantalum-silicon alloy sputtering target material crude product is obtained; and (6) the tantalum-silicon alloy sputtering target material is obtained by machining. According to the preparation method, oxidation of the silicon powder is effectively prevented, the product purity is guaranteed, the prepared tantalum-silicon alloy sputtering target material can further reach the density of 99% or above, the requirements of uniform density and internal organization structure of the tantalum-silicon alloy sputtering target material are met, a more excellent performance guarantee is provided for subsequent sputtering use, and the characteristicsof simple process, convenient operation and short production cycle are achieved.

An aluminum profile is annular and is prepared by components in percentage by weight: 91-93% of Al, 5.5-5.7% of Zn, 0.15-0.2% of Si, 0.80-0.86% of Mg, 0.1-0.14% of Cu, 0.2-0.35% of Fe, 0.1-0.12% of Cr, 0.15-0.2% of Mn, 0.1-0.25% of Zr and 0.1-0.2% of Ti. A heating processing technology comprises following steps of: (1) smelting and casting raw material aluminum ingots, enabling a casting speed to be 85-95mm/min, enabling a pouring temperature to be 715-730 DEG C, and enabling cooling water pressure to be 0.04-0.08MPa; (2) extruding, enabling an extruding temperature to be 440-460DEG C, and enabling an extruding speed to be 3-6M/min; (3) conducting stretcher strengthening, and enabling strengthening deformation quantity to be 0.5%-1.5%; (4) conducting aging furnace heating, enabling a furnace temperature of an aging furnace at a first section of aging to be 100 DEG C, enabling heat preservation time to be 3h, enabling the furnace temperature of the aging furnace at a second section of aging to be 160 DEG C, and enabling heat preservation time to be 5h; and (5) testing and packaging. The aluminum profile mainly solves the problem that the aluminum profile in the prior art is not high in strength, poor in breakage toughness and poor in fatigue performance.

The invention discloses an early strength type water reducing agent for precast concrete. The early strength type water reducing agent comprises the following components by weight percent: 5.00-6.00% of polycarboxylic acid water reducing agent, 0.50-2.00% of inorganic lithium salt, 1.00-5.00% of inorganic sodium salt, 0.00-10.00% of inorganic calcium salt, 0.01-0.30% of deformer and the balance of filling material. The early strength type water reducing agent has the characteristics that the doped amount is low, the air bleeding is low, the water reduction is high, slump is well maintained, and the early strength is rapidly increased; and by utilizing the early strength type water reducing agent, the steam heating and maintenance of the precast concrete are shortened or avoided, thereby reducing the production cost of the precast concrete.

The invention discloses a polycarboxylic acid water reducer for preparing fair-faced concrete. The water reducer is composed of following components in percentage by weight: 5.00% to 60.00% of polycarboxylic acid copolymer, 0.02% to 1.00% of slow-release antifoaming agent, 0.01% to 1.00% of antifoaming agent, 0.01% to 1.00% of air-entrainer, 0.00% to 10.00% of delayed coagulant, and the balance being water. The polycarboxylic acid water reducer for preparing fair-faced concrete has the characteristics of low mixing amount, low air-entraining, low consistency, continuous defoaming ability, and improvement on concrete uniformity, is capable of producing green concrete, which has the advantages of excellent construction performance, low consistency, and good concrete wrapping ability, and also can produce fair-faced concrete, which has a mirror-face effect.

A water separator reduces a water content of an air stream, which is used in an HVAC unit for a vehicle. The water separator includes a diverter wall and an adjacent wall spaced from the diverter wall to define an air passage. The diverter wall has a terminal end extending into the air passage for changing a direction of the air stream to reduce the water content of the air stream. A filter assembly is disposed through a receiving slot in the diverter wall and is within the air passage downstream of the terminal end.

The invention relates to a polycarboxylate superplasticizer for reducing the viscosity of high-grade concrete and a preparation method thereof. The polycarboxylate superplasticizer is prepared by: adding an initiator into the monomer alkenyl terminated polyoxyethylene ether shown as formula (1), unsaturated acid and unsaturated ester, carrying out random copolymerization reaction through an aqueous solution at room temperature, then adding a viscosity reduction regulator to conduct molecular rearrangement, and employing an alkaline regulator to adjust the product to neutral. The invention also includes a preparation method of the polycarboxylate superplasticizer for reducing the viscosity of high-grade concrete. The polycarboxylate superplasticizer provided by the invention has high water-reducing rate, can achieve good viscosity reducing effect when applied in high-grade concrete, and has the advantages of good adaptability, low gas content, good retainability and good pumpability.

The invention relates to a cement-based shrinkage-free grouting material doped with phosphorus slag powder and a using method thereof. The cement-based shrinkage-free grouting material comprises common silicate cement, the phosphorus slag powder, ultrafine slag powder, flue gas desulfurization gypsum, medium sand, fine sand, an expanding agent, sepiolite powder, a water reducer, an antifoaming agent and a water-retaining agent. For the phosphorus slag powder, the average particle size of is 20-40 [mu]m, the weight percent of the residue on sieve having a size of 45 [mu]m is not more than 25%, the specific surface area is 350-400 m<2>/kg, and the quality factor K is 1.0-1.3. For the ultrafine slag powder, the average particle size of is 10-20 [mu]m, the specific surface area measured by a nitrogen adsorption method is 600-700 m<2>/kg, and the quality factor K is 1.7-2.0. The ultrafine slag powder has high gelatinization activity which is almost equal to or even slightly superior to the gelatinization activity of 52.5 common silicate cement. The grouting material adopts a composite gelatinization material and can be used on sites by adding water and stirring. The grouting material has excellent performances, such as good fluidity, no shrinkage, rapid intensity development in the earlier period, high intensity in the later period, good anti-permeability and good erosion resistance. The grouting material is suitable for bar splicing and fixation of supports, etc., and is also suitable for grouting of prefabricated parts, cementation of fissures for prestressed bridges, modification, reinforcement and repair of concrete constructions, and the like.

The invention discloses a new energy automobile battery protective device. The new energy automobile battery protective device comprises a battery holder for placing a battery and a protective mechanism located outside the battery holder, wherein the protective mechanism comprises two L-shaped plates which are respectively located at the front side and rear side of the battery holder; the verticalparts of the L-shaped plates are connected to the battery holder through buffering air cylinders; an air inlet and an air outlet are respectively formed in the front end and rear end of the battery holder; a front blocking mechanism for blocking the air inlet is arranged on the side wall of the battery holder; the buffering air cylinders drive the front blocking mechanism to move; a rear blockingmechanism for blocking the air outlet is arranged on the inner wall of the battery holder; and a storage tank is arranged on the inner top wall of the battery holder. When an automobile is collided,the new energy automobile battery protective device timely sprays dry powder into the battery holder; if the automobile meets the open fire, the new energy automobile battery protective device can generate carbon dioxide by decomposing to play a role in flame retardant, and further reduce the oxygen content in the battery holder, can seal and isolate the battery holder and further prevents a battery from burning.

The invention discloses a C30 self-compaction microexpanded concrete-filled steel tube and belongs to the field of building materials. The C30 self-compaction microexpanded concrete-filled steel tube is prepared by taking cement, coal ash, composite expansion agents, gravel, river sand, tackifying plasticity-maintaining ultra-dispersed additive, internal maintaining materials, micro-grade modified degreasing cotton cellulose and water as raw materials. The number of binding materials adopted in the C30 self-compaction microexpanded concrete-filled steel tube is small, and the C30 self-compaction microexpanded concrete-filled steel tube has the advantages of being good in self-compaction performance, low in gas content and high in durability, being slightly expanded and the like, is suitable for compact pouring of intensely reinforced large-pipe-diameter thin-wall steel tube concrete-filled steel tube underwater piles with complex shapes and a small section size, string tube pumping pouring of upper and lower concrete-filled steel tubes of concrete-filled steel tube truss bridges and high-throwing vibration-free pouring of concrete-filled steel tube pier studs. The problem of disengaging of the concrete-filled steel tube can be effectively solved, and wide application prospects are achieved.

The invention discloses concrete and a preparation technology thereof. The concrete comprises, by weight, 290-345 parts of cement, 870-945 parts of sand, 750-900 parts of stones, 80-105 parts of fly ash, 56-88 parts of slag, 1-3 parts of polycarboxylate-type water reducing agent, 0.5-2 parts of expanding agent, 0.8-1.5 parts of addictive, 3-8 parts of fiber mixtures, 1-2 parts of defoaming agent and 145-170 parts of water. The cement is P.O 42.5 cement, the additive comprises MCC, xanthan gum and polyvinylpyrrolidone, the fiber mixtures comprise at least two kinds of glass fiber, steel fiber and carbon fiber, and the defoaming agent comprises at least one kind of polysiloxane and polyether modified polysiloxane. The concrete and the preparation technology have the advantages that the air content is lowered, and the impervious performance and the crack resistance of the solidified concrete are improved.

The invention discloses a ground and underground combined coal and coal-bed gas co-mining method for a low-permeability coal seam group. The method is applied to a gas outburst mine, a mode that the protective layer mining is combined with the ground gas extraction is used for a coal reservoir with the characteristics of low permeability and low gas content, so that an adjacent coal bed is subjected to rapid pressure relief, coal-bed gas is efficiently and rapidly extracted from the ground, and a co-mining technology system that ground and underground are combined to extract the coal-bed gas and coal and the coal bed gas are extracted while being pumped is provided, so that a highly-located drainage roadway and an end-located drainage roadway are replaced to the maximum extent, the coal mine gas treatment cost is effectively reduced, the ground coal-bed gas well yield is increased, the coal mine gas outburst risk and the gas overrun accident occurrence frequency is reduced, the coal mining efficiency is improved, and the coal mine mining safety and efficiency are realized.

The invention provides a quick water-free starting device applied to a centrifugal pump. The quick water-free starting device comprises a one-way channel, a self-suction cavity shell, a sliding device, a self-suction cavity, a concave-convex impeller, two side inlet flow channels connected with the self-suction cavity, a spring device of an upper side x-shaped gas-liquid separation device, an upper side x-shaped gas-liquid separation device, an upper and middle side gas-liquid separation device connecting shaft, a middle side gas-liquid separation device, a lower side backflow type gas-liquid separation device, a v-shaped backflow flow channel, an inverted v-shaped inlet flow channel and an inlet which are sequentially arranged from top to bottom. According to the quick water-free starting device, the centrifugal pump can directly enter the normal operation working condition after water-free starting, and 36 times of exhaust can be completed by rotating an impeller in a self-suction cavity by a circle in the earlier stage. In addition, the device is provided with an upper gas-liquid separation device, a middle gas-liquid separation device and a lower gas-liquid separation device, gas-liquid separation is fully achieved, gas can be exhausted more quickly, a cavity is filled with water, the working efficiency can be remarkably improved, and the operation process is greatly simplified.

The invention relates to a preparation method for a comb-shaped copolymer cement dispersant, a monomer used in the comb-shaped copolymer cement dispersant and the prepared comb-shaped copolymer cement dispersant. The preparation method for the comb-shaped copolymer cement dispersant comprises the following steps: a monomer (a) and a monomer (b) are subjected to free-radical copolymerization in aqueous medium, wherein the monomer (a) is expressed with a general formula (I), and the monomer (b) is expressed with a general formula (II); and the mol ratio of the monomer (a) and the monomer (b) is preferably 1:(1 to 10). The structure formula of the comb-shaped copolymer cement dispersant obtained by the preparation method is shown in (VI). The new monomer (a) is introduced in the comb-shaped copolymer cement dispersant, and the molecular structure of the monomer (a) has an unsaturated reactive double bond and two branching polyoxyalkylene long chains, so that the steric hindrance among cement particles can be greatly enhanced, and the dispersion stability of cement can be enhanced. The preparation method for the comb-shaped copolymer cement dispersant is simple and convenient for production operation, and meanwhile, the prepared comb-shaped copolymer cement dispersant has the advantages of low dosage, good dispersivity, high water-reducing rate, small slump loss and low gas content.