41results about How to "Play a foaming role" patented technology

The invention discloses a slow-release antibacterial adsorption material for drinking water treatment. The material is prepared from, by weight, 10%-60% of hydrophobic organic macromolecule polymer, 20%-50% of hydrophilic organic macromolecule polymer, 2%-20% of inorganic porous adsorbent, 0.5%-20% of antibacterial agent, 2%-5% of baking soda and 2%-10% of pore-forming agent. The invention further discloses a preparation method of the slow-release antibacterial adsorption material for drinking water treatment. According to the slow-release antibacterial adsorption material for drinking water treatment and the preparation method of the material, bacteria can be inhibited and killed effectively for a long time, secondary contamination to a water purifying machine due to microorganism breeding is eradicated, and the service life of a filter material is prolonged.

The invention discloses a compound concrete expanding agent. The compound concrete expanding agent is prepared by using the following components in parts by weight: 15 to 20 parts of calcium aluminosilicate, 25 to 30 parts of calcium sulphoaluminate, 20 to 30 parts of sulfur fixation waste residue, 10 to 20 parts of red mud, 10 to 15 parts of lithium slag, 4 to 8 parts of modified calcium oxide, 3 to 6 parts of magnesium oxide, 5 to 8 parts of methyl sodium silicate, 0.1 to 0.3 part of azodicarbonamide, 0.4 to 0.7 part of sodium tripolyphosphate, 2 to 4 parts of lauryl sodium sulfate, 0.3 to 0.6 part of ethylene-acrylic acid copolymer, 0.7 to 0.9 part of polycarboxylate superplasticizer and 0.5 to 0.7 part of nano calcium carbonate. The compound concrete expanding agent has the advantages of high strength, good compensation capability, calcium oxide reaction regulation and the like, and is a concrete additive which has a great development prospect.

The invention discloses an environment-protection transparent intumescent-type aqueous flame-retardant paint, and a preparation method and applications thereof, and belongs to the field of paint. Thepreparation method is used for solving problems in the prior art, that in using process of conventional flame retardant paint, halogen containing toxic organic volatile matters are released, flame retardant effect is poor because of the high dehydration catalyst temperature, and nontransparent paint using range is limited. The environment-protection transparent intumescent-type aqueous flame-retardant paint is composed of a component A, a component B, and a paint auxiliary agent. The preparation method comprises following steps: the component A is prepared; the component B is prepared from melamine formaldehyde resin and / or melamine modified urea-formaldehyde resin; the component A and the component B are mixed, the paint auxiliary agent is added, and an obtained mixture is stirred to be uniform so as to obtain the environment-protection transparent intumescent-type aqueous flame-retardant paint. The environment-protection transparent intumescent-type aqueous flame-retardant paint usedfor flame retardant protection of indoor timber structure materials, wood plastic composite materials, steel structure materials, or concrete structures.

The invention discloses a concrete expanding agent. The concrete expanding agent is prepared from, by weight, 10-15 parts of calcium silicoaluminate, 20-30 parts of calcium sulphoaluminate, 5-9 parts of ferric sulfate, 20-25 parts of sulfur-fixing waste residues, 15-20 parts of red mud, 6-8 parts of modified calcium oxide, 4-6 parts of magnesium oxide, 4-8 parts of sodium methyl silicate, 3-5 parts of triethanolamine, 0.1-0.3 part of azodicarbonamide, 0.5-0.7 part of sodium gluconate, 2-4 parts of sodium laurylsulfate, 0.4-0.6 part of polyethylene glycol, 1-3 parts of polycarboxylate superplasticizer, 2-6 parts of modified pyrophillite powder and 1-3 parts of nano calcium carbonate. The concrete expanding agent has the advantages of being high in strength, good in compensation capability, capable of regulating and controlling a calcium oxide reaction and the like and is a concrete additive having the development prospect.

The invention relates to the technical field of preparation of dust-falling agents and in particular relates to a preparation method of a water-retention dust-falling agent. According to the preparation method, corn starch is subjected to enzymolysis and then is subjected to grafted copolymerization with an acrylic monomer and acrylamide, so that oxidized dextrin has extremely good water absorption and expansion performance; hydrophilic groups including hydroxyl and the like, which are exposed by the corn oxidized dextrin, are good for water retention after water is absorbed, and a condition that excessive water is absorbed and then is leaked is avoided; calcium chloride is doped into the oxidized dextrin so that the water retention amount of the oxidized dextrin can be improved; an endonuclease effect of alpha-amylase is utilized to change the polymerization degree of linear side chains of amylose and amylopectin, so that the viscosity and concentration of the dust-falling agent can be controlled through water dilution; ammonium bicarbonate is added so that a solution surface of the dust-falling agent is foamed; after the surface area of the solution surface is enlarged, the wetting and adsorption performance on dust in the air is improved; meanwhile, protein isolate also has certain oil absorption performance and the absorption rate on oily dust can be improved, so that the dust-falling agent has a wide application prospect.

The invention discloses a preparation method of a wet type moisturizing and dust-suppressing agent and belongs to the technical field of environmental protection. The preparation method disclosed by the invention has the beneficial effects that due to existence of double electric layers in modified zeolite powder, alpha-1, 4 glucosidic bond is hydrolyzed from the inner parts of starch molecules ina random mode by utilizing endonuclease of alpha-starch amylase, and soybean isolate protein contains more polar groups along the own peptide chain skeleton, so that wetting and absorption for dust in the air are improved; due to addition of ox bile, the wettability of the dust-suppressing agent can be improved, the surface tension of water can be reduced, the water can be prevented from condensing into droplets and the volatilization rate can be reduced; since oxidized dextrin swells after absorbing water, the filling capacity is also increased, and in addition, due to water-absorbing groupssuch as hydroxyl groups and the like exposed in the oxidized dextrin, the action force of the formed hydrogen bonds is stronger; calcium chloride doped in the oxidized dextrin can permeate into a spatial network structure of an oxidized-dextrin grafting product, and after the dust-suppressing agent falls to the ground, the calcium chloride absorbs carbon dioxide to form hard calcium carbonate, sothat diffusion of the dust can be controlled and the application prospect is wide.

The invention provides a recyclable water purifying agent preparation method. The method includes: step 1, mixing polyether polyol, isocyanate, sodium dodecyl benzene sulfonate, carboxymethyl cellulose, dibutyltin dilaurate, aluminium hydroxide and ferroferric oxide magnetic powder to obtain a foam material; step 2, mixing butyl titanate, sepiolite powder, halloysite nanotubes, nanocrystalline cellulose, polyvinylpyrrolidone, ferroferric oxide magnetic powder and absolute ethyl alcohol to obtain a mixed liquid A; mixing a hydrochloric acid solution, absolute ethyl alcohol and water to obtain a mixed liquid B; dropwise adding the mixed liquid B into the mixed liquid A, and reacting to obtain sol; subjecting the sol to silver loading treatment; step 3, mixing the foam material, the silver-loaded sol and phenoxy resin to obtain a mixed foam material; ageing and cleaning to obtain wet sponge; step 4, drying and grinding the wet sponge to obtain a recyclable water purifying agent. The recyclable water purifying agent prepared according to the method is effective in adsorption, high in adsorption capacity, high in efficiency and recyclability.

The invention belongs to the technical field of foaming agents for concrete, and particularly relates to a composite vegetable protein foaming agent and a preparation method thereof. The composite vegetable protein foaming agent is prepared from the following raw materials in parts by weight, 10-20 parts of vegetable protein, 20-25 parts of a surfactant, 0.5-2 part of a foam stabilizer, 5-15 parts of an enhancer, 5-10 parts of a diluent and 45-70 parts of water, wherein the vegetable protein is prepared from tea saponin and cocoanut fatty acid diethanolamide in a weight ratio of 1:(1-3). The obtained composite vegetable protein foaming agent is small in bleeding rate and settling distance and completely meets the requirements of the foam concrete industry standard, and the prepared foam concrete is high in compressive strength.

The invention discloses a preparation method for a polyimide foam material and belongs to the technical field of high polymer material preparation. According to the technical scheme disclosed by the invention, the method comprises the following steps: firstly, adding pyromellitic dianhydride, polyisocyanate and polar solvent into a reaction kettle; stirring and reacting under constant temperature,thereby acquiring a prepolymer; stirring and mixing calcium oxide, absolute ethyl alcohol, foam stabilizer, viscosity reducer and coupling agent, thereby acquiring a mixed additive; mixing the prepolymer with the mixed additive, cooling and then performing programmed heating; adding absolute ethyl alcohol and water under constant-temperature stirring state; reacting, thereby acquiring a sizing agent; and performing injection molding, programmed heating and curing, and then cooling and de-molding, thereby acquiring the polyimide foam material. The polyimide foam material prepared according tothe technical scheme provided by the invention is capable of promoting the thermal stability thereof, obviously promoting the mechanical properties thereof and promoting the popularization and application thereof in various fields.

The invention relates to a medlar floating tablet for treating chronic gastritis and a preparation method thereof. The medlar floating tablet comprises medlar extractum, cuttlebone, hydroxy propyl methyl cellulose and hydroxyethyl cellulose, is developed according to screening of clinical prescriptions of modern Chinese medicine by combination with modern Chinese medical pharmacology and preparation method thereof; the medicinal values of the medlar and the cuttlebone and the foaming function of the cuttlebone are sufficiently utilized; and the hydroxy propyl methyl cellulose and the hydroxyethyl cellulose serve as hydrophilic gel skeleton materials, so that the medlar floating tablet can expand gradually in gastric juice to wrap carbon dioxide produced after the reaction of a foaming agent and the gastric juice so as to reduce the density of the tablet; and therefore the floating effect of the medlar floating tablet in the stomach is favorably achieved, the action time of the medlar and the cuttlebone in the stomach is prolonged, effective components are easy to absorb, the action is more durable, and the medical effect is more obvious. The medlar floating tablet is particularly suitable for chronic superficial gastritis and chronic atrophic gastritis; any toxic or side effect is not found; and the raw materials are wide in sources and low in cost, and are easy to obtain.

The invention discloses modified diatomite-based multifunctional building board, and belongs to the technical field of building materials. The modified diatomite-based multifunctional building board is prepared by the following steps: calcining diatomite to obtain primary treated diatomite; mixing the primary treated diatomite with an agar liquid, performing nitrogen charging and thermal insulation reaction, so that secondary treated diatomite is obtained; mixing the secondary treated diatomite with a casein solution to obtain tertiary treated diatomite; mixing the tertiary treated diatomite with a ferric chloride solution, and performing vacuum concentration, so that quaternary treated diatomite is obtained; performing ball milling on the quaternary treated diatomite with paraffin wax, soas to obtain modified diatomite; and mixing the modified diatomite, silane coupling agent, sepiolite, modified carbonized coconut shell fiber, phenolic resin, polyvinyl alcohol solution, curing agentand water to obtain a mixed slurry, and then injecting the mixed slurry into a mold, putting the mold into a hot press, and performing hot press molding, so that the modified diatomite-based multifunctional building board is obtained. The modified diatomite-based multifunctional building board has a good bending strength, and has a certain purifying effect on formaldehyde.

The invention provides a foaming agent, a tundish covering agent, and a preparation method and application thereof, and relates to the technical field of metal smelting. The foaming agent is mainly prepared from (a) a carbonate mineral and (b) a carbon-containing material; the tundish covering agent can have foaming capacity and can form foam slag by adding the foaming agent, so that the thermalload radiated to a tundish liner in a plasma heating process of a tundish is greatly reduced; the thermal efficiency is improved; meanwhile, the formed foam slag can wrap a plasma arc so as to reduceelectricity consumption and electrode loss, and improve the stability of the plasma stability; and a protecting effect can also be achieved on the tundish liner, so that the service life of a tundishbody is prolonged. In addition, the noise produced by the plasma arc can also be reduced by the formed foam slag; the dust and the arc light flash of a plasma arc can be reduced; the pollution to theenvironment can be reduced; and the operation environment of a worker can be improved.

The invention discloses a method for preparing expanded asphalt, and belongs to the technical field of materials for paving pavements. The method comprises the following steps: performing a heat insulation reaction on a functional assistant, a sodium silicate solution, water and crushed asphalt at a lower temperature, rising the temperature, performing heat insulation foaming, lowering the temperature to room temperature, adding isocyanate, and continuously performing stirring and reacting to obtain the expanded asphalt, wherein the functional assistant is obtained by mixing a self-made emulsified dispersion, polyethyleneimine and a crosslinking agent, and carbon dioxide is continuously introduced into the system in the mixing process; and the emulsified dispersion is formed by octenyl succinic acid modified starch, enzymatically hydrolyzed chitosan, water and linoleic acid. The expanded asphalt prepared in the invention has the characteristics of excellent mechanical properties, prolonged foam stabilizing time and effectively improved bonding strength.

The invention discloses a method for application of limestone instead of calcium carbide to LF refining. The method comprises the following steps that in the LF refining process, after molten steel enters a station and a steel ladle enters a working station, bottom blowing argon is connected and opened, 3.0 to 5.0 kg of lime and 2.0 to 3.0 kg of limestone are added into per ton of steel, meanwhile, according to different steel types, 0 to 0.7 kg of aluminum granules, 0 to 0.8 kg of silicone-calcium powder and 0 to 1.0 kg of a ferrosilicon powder deoxidizing agent are added into per ton of steel, after stirring is conducted for 3 to 5 min, the flow of the argon is adjusted, and then electrodes are lowered for heating; and the limestone is heated and decomposed to generate CaO and CO2, wherein the CaO serves as a slagging material to enter slag, the steel slag is filled with the CO2, thus the foaming effect is achieved, and the effect of submerged arc operation is achieved. According tothe method, by using the cheap limestone instead of the expensive calcium carbide to serve as a foaming agent, the expected submerged arc effect is achieved, the refining production cost is lowered obviously, and the labor intensity of workers is lowered.

The invention discloses coal gangue compound fertilizer and a preparation method thereof. The coal gangue compound fertilizer is prepared from 68-72 parts by weight of coal gangue, 9-11 parts by weight of nitrogen-containing urea with content of 45%, 2.8-3.2 parts by weight of hydrochloric acid, 9-11 parts by weight of pine needles, 22-26 parts by weight of weeds and 3-5 parts by weight of oil dreg. The preparation method mainly utilizes coal gangue as a main raw material. In the karst region, coal ores are more and are easy to acquire. The compound fertilizer contains a large amount of phosphorus, iron, calcium, magnesium and potassium which are conducive to growth, and can greatly promote the plant growth. The coal gangue can be recovered and recycled so that the coal gangue economic andecological benefits are greatly improved. The coal gangue compound fertilizer realizes a low preparation cost and has effects the same to those of calcium superphosphate, nitrogen fertilizer and phosphorus fertilizer. The coal gangue compound fertilizer improves a yield, greatly improves the starch content and prevents surface cracks of sweet potatoes and potatoes.

The invention discloses a preparation method of an antiskid glazed tile, and belongs to the technical field of building materials. The method comprises the steps that Suzhou clay, talcum powder, wollastonite and kuancheng soil are mixed, ball-milled and screened to obtain mixed powder; straw, cotton stalk, walnut shells are mixed, smashed and screened to obtain mixed shred residues; the mixed shred residues, secondary sedimentation tank sludge and water are mixed and fermented to obtain a fermentation mixing solution; the mixed powder, the fermentation mixing solution and water are stirred andmixed, and compression molding and drying are performed to obtain a dry green brick; the slag mixture, clay, bacterial cellulose, bauxite, phospholipid and water are stirred and mixed to obtain modified glaze; the modified glaze is applied to the surface of the dried green brick, nitrogen is charged for a high-temperature reaction, and step-by-step cooling, calcination and cooling are performed to obtain the antiskid glazed tile. The antiskid glazed tile has the excellent anti-skid performance.

The invention discloses a preparation method of fiber-reinforced polypropylene composite and fiber-reinforced polypropylene composite prepared via the preparation method. The fiber-reinforced polypropylene composite is prepared by mixing well, at high temperature, a polypropylene matrix, polyethylene, carbon fiber, modified polyacrylonitrile fiber, maleic anhydride grafted polypropylene, a nucleating agent, an anti-aging agent, an antioxidant and a deodorant, performing melt blending, and granulating by extruding. Strength of the fiber-reinforced polypropylene composite and fiber-reinforced polypropylene composite can be enhanced via the carbon fiber and modified polyacrylonitrile fiber; the modified polyacrylonitrile fiber has a foaming function; the carbon fiber of light weight helps implement lightweight production; the polypropylene helps improve toughness of the composite; the anti-aging agent helps significantly improve aging resistance of the composite and extend the service life of the composite; in addition, oxidation resistance of the composite can be improved, the composite can adsorb peculiar odor in air to improve air quality, the preparation method is simple, the costis low, lightweight production of automobiles can be achieved, and the preparation method has a promising application prospect.

The invention discloses a preparation method of porous hydrogel and belongs to the technical field of high molecular materials. The preparation method comprises the following steps: sequentially weighing 40-50 parts by weight of pretreated acrylamide, 8-10 parts by weight of dry oil, 3-5 parts by weight of linoleic acid, 5-8 parts by weight of an emulsifying agent, 8-10 parts by weight of calciumcarbonate, 2-3 parts by weight of ammonium persulfate, 10-20 parts by weight of a modified additive, 8-10 parts by weight of a composite foaming agent and 60-80 parts by weight of water; mixing the pretreated acrylamide, the dry oil, the linoleic acid, the emulsifying agent, the calcium carbonate and the water, then adding the ammonium persulfate, performing nitrogen-filled heating and stirring reaction, then adding the modified additive and the composite foaming agent, injection-molding, standing and de-molding to obtain a blank; putting the blank in hydrochloric acid for ultrasonic immersion, taking out and drying to obtain the porous hydrogel. The porous hydrogel prepared by the technical scheme of the invention has the characteristics of high porosity and strength, thereby having a wide prospect in the development of the high molecular material technology industry.

The invention relates to a disinfection and sterilization device and a use method, in particular to a device for electrochemically removing, disinfecting and sterilizing dental plaque bacterial biofilms on the surface of a dental implant and a use method. The disinfection and sterilization device comprises a syringe, an outlet of the syringe is connected with one end of a catheter, the other end of the catheter is communicated with an inner cavity of a sleeve, one end of a sleeve wire is connected to the sleeve, the other end of the sleeve wire is connected with one end of a direct-current power source, the other end of the direct-current power source is connected with one end of an implant wire, a rubber sleeve is sleeved on the sleeve form the insertion end of the sleeve, and a handle clamping sleeve is sleeved at one end of the opening of the rubber sleeve sleeved on the sleeve. The disinfection and sterilization device and the use method have the advantages that the dental plaque on the surface of the implant is disinfected and sterilized through the electrochemical principle, after the implant is thoroughly cleaned, bones can grow on the surface of the implant again, and new synostosis is formed through growth. Meanwhile, a foaming effect is also achieved, and the implant surface is cleaned thoroughly.

The invention relates to a preparation method of a coating, and particularly relates to a wall coating with an energy-saving effect for museum decoration. The coating sequentially comprises a base layer, a foam layer and a sealing layer from inside to outside, wherein the base layer contains active hydroxyl; the foam layer contains groups capable of reacting with the active hydroxyl, and can foam and expand at a temperature of more than 10 DEG C to form dense small pores; and the sealing layer can cover the small pores on the surface of the foam layer, and can be bonded with the foam layer. The wall coating overcomes the defect of high energy consumption caused by high heat conduction efficiency of a wall in a museum in the prior art. The coating has good heat preservation and insulation effects through a multi-layer structure, effectively reduces the energy consumption, and has good mechanical properties, thereby having the advantage of long service life. In addition, the wall coating has good sound insulation and absorption effects, and can absorb noise in the museum.

Personal care compositions in the form of a stable oil-in-water emulsion comprises: (i) a continuous aqueous phase comprising water; (ii) a discontinuous phase comprising foam forming component (s), trans-1-chloro-3, 3, 3-trifluoropropene (1233zd (E) ) and trans-1-3, 3, 3-tetrafluoropropene (1234ze (E) ), wherein said 1233zd (E) and said 1234ze (E) together comprise from about 40% to about 60% by weight of said personal care composition and are present in a trans1233zd: trans1234ze weight ratio of from about 8: 1 to about 8: 1; (iii) an emulsifier having an HLB value of from about 7 to about 18 and which may be present in the continuous and / or discontinuous phase; and (iv) one or more active ingredients which maybe present in the continuous and / or discontinuous phase. A method of treating human skin, hair and / or mucous membranes comprises providing the personal care composition.

The invention discloses a concrete expanding agent. The concrete expanding agent is prepared from, by weight, 10-15 parts of calcium silicoaluminate, 20-30 parts of calcium sulphoaluminate, 5-9 parts of ferric sulfate, 20-25 parts of sulfur-fixing waste residues, 15-20 parts of red mud, 6-8 parts of modified calcium oxide, 4-6 parts of magnesium oxide, 4-8 parts of sodium methyl silicate, 3-5 parts of triethanolamine, 0.1-0.3 part of azodicarbonamide, 0.5-0.7 part of sodium gluconate, 2-4 parts of sodium laurylsulfate, 0.4-0.6 part of polyethylene glycol, 1-3 parts of polycarboxylate superplasticizer, 2-6 parts of modified pyrophillite powder and 1-3 parts of nano calcium carbonate. The concrete expanding agent has the advantages of being high in strength, good in compensation capability, capable of regulating and controlling a calcium oxide reaction and the like and is a concrete additive having the development prospect.

The invention discloses a modified concrete expansive agent, made from, by weight, 10-20 parts of calcium silicoaluminate, 25-30 parts of calcium sulfoaluminate, 20-25 parts of sulfur fixing waste residue, 10-20 parts of modified red clay, 1-5 parts of tourmaline powder, 6-8 parts of iron slag, 4-6 parts of modified calcium oxide, 4-6 parts of magnesium oxide, 3-5 parts of sodium methyl silicate, 2-4 parts of calcium formate, 0.1-0.3 part of azodicarbonamide, 0.4-0.7 part of maltodextrin, 1-4 parts of sodium lignin sulfonate, 0.3-0.6 part of polyglycol ether, 1-3 parts of a polycarboxylate superplasticizer, 2-5 parts of modified diatomite powder, and 0.5-0.8 part of nano calcium carbonate. The modified concrete expansive agent has the advantages of high strength, good compensating capacity and the ability to control calcium oxide reaction and is a promising concrete admixture.

The invention discloses a double-handle faucet which comprises a bottom plate, a pair of plastic pipes, a pair of tooth pipes and a communicating pipe. Two through holes are formed in the bottom plateat intervals, the plastic pipes are positioned on the bottom plate, the upper end of each tooth pipe penetrates the corresponding through hole and is coaxially arranged in the corresponding plastic pipe in a sleeving manner, each plastic pipe is fixedly connected with the bottom plate, two ends of the communicating pipe are communicated with the plastic pipes, and the communicating pipe is communicated with a water outlet pipe. According to the double-handle faucet, the upper ends of the tooth pipes penetrate the through holes formed in the bottom plate, the lower ends of the plastic pipes externally sleeve the tooth pipes, the plastic pipes are fixedly connected with the bottom plate, the strength of the bottom plate is high, the mounting force of the whole faucet is increased, all components are more stably connected, and cracking in mounting due to excessive mounting force of all plastic components is avoided.

The invention discloses a method for blowing a steel ladle top slag modifier by using CO2, which comprises the following steps: respectively crushing and ball-milling limestone fine ore and aluminum ash, mechanically and uniformly mixing the obtained powder according to a certain proportion to prepare the steel ladle top slag modifier, and after tapping of a converter, spraying the prepared steel ladle top slag modifier and modified steel ladle top slag through a blowing device. The blowing device comprises a top-blowing spray gun arranged at the top of the steel ladle, CO2 is introduced into an inner cavity of the top-blowing spray gun to serve as carrier gas and stirring gas, a refractory material layer is arranged at the end, inserted into the steel ladle, of a blowing head of the top-blowing spray gun, the top-blowing spray gun is controlled to ascend and descend through a lifting control system, and the top of the top-blowing spray gun is connected with a discharging valve at the bottom of a powder spraying tank through a discharging pipe. The top of the powder spraying tank is connected with a powder bin through a feeding pipe. The modifier disclosed by the invention is prepared by crushing, ball-milling and mixing industrial waste limestone powder and aluminum ash, the cost is low, and CO2 gas is adopted for injection, so that the problems of molten steel splashing and slag and steel sticking at a steel ladle opening are avoided.

The invention discloses a double-handle water faucet having a lift-type water drainage function. The double-handle water faucet comprises a bottom plate, a pair of threaded tubes, a pair of plastic tubes, and a communicating tube, wherein the bottom plate is provided with two through holes at intervals; the upper ends of the pair of threaded tubes separately penetrate through the through holes; the lower ends of the pair of plastic tubes are separately and coaxially arranged in the threaded tubes in a sleeving manner; each of the plastic tubes is fixedly connected with the bottom plate; the two ends of the communicating tube separately communicate with the pair of plastic tubes; and the communicating tube is provided with a water outlet tube in a communicating manner. According to the double-handle water faucet disclosed by the invention, the upper ends of the threaded tubes separately penetrate through the through holes formed in the bottom plate, and then the lower ends of the plastic tubes are arranged in the threaded tubes in a sleeving manner, so that the plastic tubes are fixedly connected with the bottom plate, and the strength of the bottom plate is high, and thus, the mounting force of the whole water faucet is improved, connection among various parts is more stable, and the phenomenon that the whole parts are cracked during mounting because of large mounting force when the whole parts are plastic materials is avoided.

The invention discloses an expansive agent for building concrete. The expansive agent comprises, by weight, 10-20 parts of calcium silicoaluminate, 20-25 parts of calcium sulfoaluminate, 20-30 parts of sulfur fixation residues, 15-25 parts of red mud, 10-15 parts of magnesium slag, 4-8 parts of modified calcium oxide, 4-7 parts of magnesium oxide, 3-8 parts of methanesiliconic acid sodium salt, 3-5 parts of triisopropanolamine, 5-8 parts of aluminum potassium sulfate, 0.1-0.3 part of azodicarbonamide, 0.5-0.8 part of sodium citrate, 2-4 parts of sodium dodecyl benzene sulfonate, 0.4-0.6 part of ethylene-vinyl acetate copolymers and 1-3 parts of polycarboxylic acid water reducing agents. The expansive agent has the advantages that the expansive agent is high in strength and excellent in compensation capacity and calcium oxide regulation and control reaction and is a concrete admixture with a great prospect, and the like.