180results about How to "No subsidence" patented technology

A preparation method of a grapheme and ferriferrous oxide composite nanometer material belongs to the technical field of functional materials. The preparation method comprises the following steps: at first, oxidized grapheme is prepared by an improved chemical method; and then oxidized grapheme and ferric ions are adopted as raw materials, and are compounded through adopting a solvothermal technology to carry out one-step in-situ reduction to obtain the grapheme and ferriferrous oxide composite nanometer material. The preparation method solves the problems in the prior art that the interface binding force of grapheme and a magnetic material is insufficient, the appearances, the sizes and the magnetism of magnetic material particles are uncontrollable, and the magnetic material particles cannot be dispersed in water; the prepared composite nanometer material shows a microspheric appearance, has a loose surface and is high in specific surface area; through the change of the ratio of grapheme to the ferric ions, final magnetic property and electrical property of the composite material can be adjusted; and the controllable growth of the grapheme and ferriferrous oxide composite material is realized. The prepared grapheme and ferriferrous oxide nanometer microsheric material with magnetic and electric properties can be used in fields such as biological medicine, energy, invisibility and electronic materials.

The present invention belongs to the field of chemical technology, and is especially one kind of conducting water soluble polyurethane paint containing carbon nanotube and its preparation process. The conducting paint is prepared through the first modifying carbon nanotube chemically for the surface to carry hydroxyl group, carboxyl group or amino group; the subsequent introducing to polyester polyol or isocyanate terminated polyurethane pre-polymer through chemical bonding and self-emulsifying to prepare water soluble polyurethane dispersoid containing carbon nanotube; and final adding deionized water and assistants through high speed stirring to obtain the conducting paint. The conducting paint can form coating with volume resistivity of 1x10<-5>-4x10<-4. ohm.cm, surface resistivity of 1x10<-1>-2x10<2> ohm, adhesion of 0 grade, shielding effectiveness of 70-85 dB, and long term stability, and has wide application.

The invention discloses a sludge treatment method, as well as sludge foamed lightweight concrete produced through the method and application thereof. In the method, sludge produced by sewage treatment first reacts with quicklime so as to form sludge hydrated lime; then the sludge hydrated lime is mixed with cement and water so as to form sludge concrete; foaming agent produces foam by utilizing a foaming system of a foaming machine; and the foam is mixed with the sludge concrete. The sludge treatment method can directly obtain the sludge foamed lightweight concrete. The sludge foamed lightweight concrete has a plurality of functions, which can be used as a filling material, a heat insulating material, a walling material, a sound insulation material, a mine tunnel filling material, an artificial landscape manufacturing material, a road recovery material, a pipe base filling material and the like. The sludge treatment method is low in cost and friendly to environment, can directly produce the sludge foamed lightweight concrete with a plurality of functions, and not only solves the sludge treatment problems in the sewage treatment industry, but also ensures the full utilization of the sludge.

The invention belongs to the technical field of waterborne coating preparation processes, and particularly relates to an organosilicon-modified waterborne polyurethane composite material and applications thereof. The organosilicon-modified waterborne polyurethane composite material comprises a first step of preparing amino-containing ladder-shaped polysilsesquioxane; a second step of reacting the polysilsesquioxane and a hydrophilic polyurethane prepolymer with end groups of -NCO, to form a prepolymer of the organosilicon-modified waterborne polyurethane; and a final step of adding an alkaline neutralizer and distilled water, and stirring for dispersion. The organosilicon-modified waterborne polyurethane composite material is characterized in that the amino-containing ladder-shaped polysilsesquioxane can react with -NCO of the hydrophilic polyurethane prepolymer with end groups of -NCO, enables the prepolymer to extend chains and has a cross-linking reaction; water-resistant performance of the prepared composite material is greatly increased; and simultaneously hardness and heat resistance of polyurethane are improved significantly due to the introduction of the ladder-shaped polysilsesquioxane. The composite material can be used as surface coating materials of woods, paper and the like, or used as coating agents of textiles and leather.

The invention belongs to the technical field of municipal engineering, and particularly relates to an anti-settling manhole cover and a construction method of the anti-settling manhole cover. The anti-settling manhole cover comprises a support seat and a cover plate which is arranged on the support seat in a buckled mode. The anti-settling manhole cover is characterized in that the support seat is fixedly provided with a flange plate in a connected mode, the lower portion of the support seat is inserted into an adjusting ring, adhesive tape is arranged between the support seat and the cover plate, and an elastic locking device mounted on the support seat is arranged below the adhesive tape. The anti-settling manhole cover and the construction method of the anti-settling manhole cover have the advantages that the problems that the periphery of a manhole is loose, cracks and is settled, the manhole cover is missing, a vehicle bumps when passing through the manhole cover, noise is generated, and the like are solved; the manhole cover is perfectly connected with a road surface around the manhole cover, the height of the manhole cover is the same as that of the road surface around the manhole cover, the flatness can meet road surface acceptance criteria, the overall flatness of the road surface is guaranteed, and the good effects that the road surface is attractive and a driver feels comfortable when driving on the road surface are solved; the structural integrity is improved, the periphery of the manhole does not sink, and the manhole cover is not prone to loss and damage; and the anti-settling manhole cover and the construction method of the anti-settling manhole cover have a wide application scope in manhole cover installation and reinforcement projects in the municipal engineering and have popularization value.

The invention discloses a micro-emulsion type oil stain cleaning agent and a preparation method thereof. The micro-emulsion type cleaning agent comprises 55-84 parts of inorganic salt aqueous solution with concentration of 20-50wt%, 5-10 parts of nonionic surfactant, 5-10 parts of ionic surfactant, 1-3 parts of cosurfactant and the balance of oil phase based on 100 parts by weight. The preparation method comprises the steps of uniformly mixing the ionic surfactant, nonionic surfactant and cosurfactant with the inorganic salt aqueous solution to obtain a mixed liquid, dropwise adding the oil phase into the mixed liquid under a room-temperature stirring condition, and standing to obtain the micro-emulsion type oil stain cleaning agent. The micro-emulsion type cleaning agent disclosed by the invention is formed under a high-salt concentration condition and has the advantages of good long-term stability, high-temperature stability and low-temperature stability; meanwhile, a small quantity of surfactant is required, the solubilizing ability on various types of oil phases is strong, and a good cleaning effect is realized on polar and non-polar oil stains.

The invention discloses a high-performance prestressing duct grouting agent which is prepared by the following components, by weight, 1-10% of water reduction component, 15-40% of water retention component, 1-10% of plastic-reserving component, 0.03-0.3% of tackifying component, 0-0.5% of delayed coagulation component, 0.1-1% of plasticity expansion component and 50-70% of later-stage volume expansion component. By mixing the high-performance prestressing duct grouting agent into cement according to a ratio of 10%, grout can obtain high mobility and high plasticity stability, a segregation layering phenomenon is greatly reduced, bleeding is avoided, and grouting is full. Whole-process volume stability of the prepared grout is high, micro expansion of plasticity and hardening stages can effectively compensate various contractions. Early strength and high-strength performance of the grout are prominent, durability is good, and the grout is applicable to various prestressing duct constructions. Simultaneously, bag-packaged additives are even in composition compared with additives prepared on the spot, transportation and comprehensive cost is low, and technical economical benefit is remarkable.

The invention provides heat-conducting silica gel as well as a preparation method and application thereof. The heat-conducting silica gel comprises an adhesive A and an adhesive B according to a massratio of (0.5-1.5): 1; wherein the adhesive A comprises the following components in parts by weight: 100 parts of vinyl silicone oil, 10-30 parts of vinyl MQ silicone resin, 0.5-5 parts of hydrogen-containing silicone oil, 0.1-2 parts of an inhibitor, 300-1500 parts of a heat-conducting filler and 1-10 parts of a coupling agent; the adhesive B is prepared from 100 parts of vinyl silicone oil, 10 to 30 parts of vinyl MQ silicon resin, 1 to 20 parts of a catalyst, 300 to 1500 parts of a heat-conducting filler and 1 to 10 parts of a coupling agent; and the vinyl silicone oil is prepared from vinyl silicone oil with the viscosity of 1 to 2000 cps and vinyl silicone oil with the viscosity of 5000 to 65000cps. The heat-conducting silica gel provided by the invention has good storage stability, and a cured product of the heat-conducting silica gel has relatively high strength and toughness and is easy to integrally peel off.

The invention discloses a polycarboxylate-based ceramic water reducer and a preparation method as well as an application thereof. The water reducer comprises monomers, distilled water, an inorganic chain transfer agent and an initiator; the monomers account for 29-45 percent of the total mass of the monomer and the distilled water; the monomers comprise acrylic acid and crotonic acid; acrylic acid accounts for 66-89 percent of the total mass of the monomers, and crotonic acid accounts for 10-40 percent of the total mass of the monomers. The polycarboxylate-based water reducer based on crotonic acid has the advantages of low mixing amount, high water reducing rate, simplicity in preparation and operation and no need of compounding with inorganic salts, and meet the requirements of ceramic production enterprises; the requirements on equipment during the production of the polycarboxylate-based ceramic water reducer are simple, post treatment is unnecessary, the energy consumption is small, and no environmental pollution is generated; the dose of pottery clay is small during application, the water reducing effect is good, the fluidity of ceramic slurry can be remarkably improved, and the viscosity of ceramic slurry is reduced; no settlement phenomenon of ceramic slurry appears within the adding dose range.

The invention discloses water-soluble and oil-soluble diamond grinding liquid, and belongs to the field of precise finishing and polishing processing. The liquid is prepared by the following raw materials in percentages by weight: 54-87% of base oil, 5-15% of an emulsifier, 5-10% of a co-emulsifier, 0.1-1% of an anti-aging agent of oil products, 0.05-5% of a diamond abrasive, and the balance being water. The invention also discloses a preparation method of the water-soluble and oil-soluble diamond grinding liquid, and the method comprises the following steps: (1) the base oil, the emulsifier, the co-emulsifier and the anti-aging agent of oil products are mixed and poured into a reaction vessel, and heating is carried out with stirring at 70 DEG C for 10-20 minutes; (2) the diamond abrasive is added into water and placed in supersonic wave with stirring for 10 minutes, and mixed liquor is obtained; (3) the mixed liquor with dispersed diamond abrasive is slowly added into a reaction vessel, temperature is raised to 70 DEG C with stirring for 30 minutes, temperature is reduced to room temperature with stirring, and the water-soluble and oil-soluble diamond grinding liquid is obtained.

The invention provides a material mixing method of graphite negative electrode slurry. The graphite negative electrode slurry comprises a first graphite material, a second graphite material and a third graphite material, wherein the average grain diameter of the first graphite material is d1, the average grain diameter of the second graphite material is d2, and the average grain diameter of the third graphite material is d3, wherein d1 is smaller than d2 which is smaller than d3, and d2 is equal to k*(d1+d3); k is equal to a*(c1+c3) / (c2+0.5), wherein a is an equilibrium constant, and a is greater than or equal to 1.1 and less than or equal to 1.3; c1, c2 and c3 represent percentages of the first graphite material, the second graphite material and the third graphite material; and c1+ c2 +c3is equal to 1, and c1+c2 is less than or equal to c3. The material mixing method comprises the following steps of carrying out mixing on the first graphite material, the second graphite material andthe third graphite material to obtain three slurry materials respectively, and then enabling the three slurry materials to be mixed according to a specific sequence to obtain the graphite negative electrode slurry with high dispersion degree. The graphite negative electrode slurry disclosed by the invention is high in graphite dispersion degree, free of agglomeration, free of sedimentation, high in storage stability, high in energy density and high in rate performance.

The present invention relates to piping no dig construction technique. The level orienting drill pass through tamping bushing separation egg gravel technique first need to build a work pit, its improvement is that: it has the following steps: (1) laying rail; (2) mounting tamping pipe hammer; (3) tamping steel bushing; (4) digging out earth from the bushing; (5) mounting a central position pipe. The technique combines the tamping bushing construction technique with the level orienting drill construction technique, solves the problem that the construction can not be proceeded caused by the unsteady of the ground at two ends of earth in and out points in the level orienting drill construction, and has the following characteristics: (1) adapting to piping for multiple earth layers, backfill layers, running sand layers and various gravel containing ground layers. (2) The ground will not generate apophysis or sedimentation phenomenon, the ground layer adaptability is strong, piping speed is fast and can be to 25m / h. (3) the construction occupies small ground. The tamping bushing construction work surface is in the orienting drill pass through drill ground, occupies small ground, has small earth cubic, and convenient in operation.

The invention discloses a flatness measurement instrument and method for a loose laying layer of a bituminous pavement. The flatness measurement instrument comprises a foldable folding beam, wherein a plurality of piston shoes used for supporting the folding beam are arranged at the bottom of the folding beam, a steel wire rope is arranged in the folding beam, the folding beam is arranged horizontally, parallel supporting rods are arranged on the folding beam, the supporting rods are arranged horizontally, a first vertical rod and a second vertical rod are arranged on the supporting rods, a measurement shoe capable of moving up and down is arranged at the bottom end of the first vertical rod, and a distance measurement sensor connected with the measurement shoe is arranged on the second vertical rod. The flatness measurement instrument for the loose laying layer is of a foldable structure, the distance measurement sensor installed on the folding beam can continuously measure flatness changes of the loose laying layer laid through a paver, warping caused by high temperature is avoided, and measurement precision is improved compared with a measurement method through a 3-m ruler. The flatness measurement instrument for the loose laying layer is mainly composed of the folding beam, the piston shoes and the distance measurement sensor and is simple in structure, low in manufacturing price and convenient to use.

The invention discloses anti-phosphor deposition high thixotropic LED (light-emitting diode) jelly glue. By selecting a coupling agent and optimizing hydrolysis conditions, a thixotropic material is obtained by modifying a gas phase, namely silicon dioxide, and anti-deposition phosphor is obtained by modifying phosphor. The thixotropic material is added into a silica gel system to obtain a high thixotropic silica gel system with a thixotropic index which is as high as 5; by adding different types and different contents of modified phosphor into the system, the jelly glue with different color temperatures can be integrally mixed, the jelly glue can not produce deposition within a shelf life of 3 months, and the color temperature value after packaging can be kept unchanged. The jelly glue disclosed by the invention is packaged by a needle cylinder, a mold is not required for assistance, the jelly glue can be directly fixed on a dispensing machine for use, and automatic forming is performed after dispensing. According to the jelly glue disclosed by the invention, the phosphor and the silica gel system are combined into a whole to prepare the jelly glue, the mold packaging step of an LED packaging link can be eliminated, the downstream packaging process is simplified, the production period is shortened, and the production efficiency is improved, so that the jelly glue has good application prospects.

The invention relates to a method of improving dispersity and interface compatibility of graphene in epoxy resin. The method comprises the steps of performing stirring and ultrasonic dispersion on and dissolving graphite oxide and a disproportionated rosin purification product dehydroabietic acid in a cosolvent of graphite oxide and dehydroabietic acid at any ratio, evaporating a graphite oxide / dehydroabietic acid solution to remove the cosolvent to form graphite oxide / dehydroabietic acid powder, putting the graphite oxide / dehydroabietic acid powder in a graphite oxide reducer for reaction to form graphene / dehydroabietic acid powder, allowing the graphene / dehydroabietic acid powder to react with polyamine to form graphene / rosinyl polyamine, and mixing and curing graphene / rosinyl polyamine and the epoxy resin to form a uniform dispersion graphene / epoxy resin composite. The design method is novel; no surfactant is required to be used in a preparation process; the graphene is dispersed in the epoxy resin without a solvent; and the method is easy to operate and suitable for mass production.

The invention provides an inorganic foamed concrete insulation board and a preparation method thereof. The insulation board comprises foamed concrete, and has density of 160-250kg / m<3>, compressive strength of 0.3-0.5 MPa, and coefficient of thermal conductivity of 0.05-0.062 W / m.K. The prepared insulation board has the characteristics of low unit weight and good heat insulation effect, and can be widely used as an insulation material in the field of construction.

The invention relates to uniform-sized konjak gulcomannan microspheres. The average particle size of the microspheres is less than 10 mu m; the content of the konjak gulcomannan in the microspheres is greater than 20% (w / w); the particle size is uniform; and the particle size distribution coefficient Span value is less than 0.9. The invention further provides a preparation method of the microspheres. According to the invention, the problems that the konjak gulcomannan microspheres of which the particle size is less than 10 mu m are hard to prepare by using the conventional method and the prepared microspheres are not uniform in particle size are solved.

The invention relates to a cast-in-situ bored pile structure and a construction method thereof, and belongs to the technical field of cast-in-situ piles. According to the key points of the technical scheme, the cast-in-situ bored pile structure comprises a pouring hole formed in the ground, a steel casing is arranged on the hole wall, close to the top end, of the pouring hole in an inserted mode, two mutually opposite blocking sheets are fixedly arranged at the edge of the top end of the steel casing, positioning assemblies are arranged on the two opposite sides of the pouring hole in the diameter direction of the pouring hole and comprise positioning rods and positioning rings, each positioning ring is in a semicircular shape attached to the outer wall of the steel casing, one ends of the positioning rods are in hinged connection with the positioning rings, the other ends of the positioning rods are in hinged connection with the ground, when the two positioning rings abut against the outer wall of the steel casing, the top ends of the positioning rings abut against the blocking sheets, the two positioning rings are in a circular ring shape with the outer diameter being equal to the outer diameter of the steel casing, and the two positioning rings are detachably and fixedly connected. The effect of improving the forming quality of the cast-in-situ pile is realized.

The invention discloses elastic modified resin for oil well cement. The elastic modified resin comprises the following raw materials in parts by weight: 100 parts of an epoxy resin-based solution and10-25 parts of an epoxy resin curing agent. The invention further discloses well cementation cement paste. The ell cementation cement paste comprises the following raw material s in parts by weight: 100 parts of cement, 36-44 parts of fresh water, 3-6 parts of a fluid loss agent, 0.1-0.6 part of a dispersing agent, 1-4 parts of an early strength agent, 2-5 parts of a reinforcing agent, 0.2-0.6 part of a retarder, 0.5-1.5 parts of a defoaming agent and 20-50 parts of elastic modified resin. According to the invention, the elastic modified resin is used as an admixture functional material for oil well cement and is mixed with the oil well cement for use, so the damage resistance of a cement sheath is enhanced, and the cement paste has the advantages of good stability, no sedimentation phenomenon, good fluidity, adjustable thickening time and low water loss, and meets the requirements of cementing construction operation.

The object of the present invention is to prevent the sag caused when the outer copper foil layer is attached to the substrate for the inner layer, wherein the substrate for the inner layer has an interlayer conduction device such as an interstitial via hole (IVH) or a blind via hole (BVH). holes or recesses. For this reason, the manufacturing method of the copper-clad laminate adopted is characterized in that the following copper foil is used as the outer layer to make the copper-clad laminate: (1) The breaking strength measured by the compression test after heating is 275 kN Resin-attached copper foil with a resin layer formed on the surface of copper foil with a thickness of 15 microns or more per square meter, (2) copper foil with an erodible carrier foil, and the total thickness of the carrier foil layer and the copper foil layer is or (3) copper foil with peelable carrier foil, wherein the total thickness of the carrier foil layer and the copper foil layer is more than 20 microns, and the thickness formed between the carrier foil layer and the copper foil layer is measured after heating. The peeling thickness of the bonding interface layer is 5-300 grams force (gf) / cm.

The invention provides a mixture containing nano-particles, which is prepared by using star-shaped block copolymers and multi-arm block copolymers, and meanwhile, the invention provides a method for preparing the mixture containing the block copolymers and the nano-particles and application of the method. By using the star-shaped block copolymers and multi-arm block copolymers provided by the invention, the nano-particles can be effectively dispersed into an organic medium, and a formed dispersion system is high in stability, and can be stored for a long time without sedimentation.

The invention provides a lithium battery silicon carbon negative electrode slurry. The slurry includes, by mass, 10-30 parts of silicon carbon, 70-90 parts of graphite, 1-3 parts of a first conductiveagent, 0.1-1 part of a second conductive agent, 3-5 parts of a binder, and 40-70 parts of water; the binder is polyacrylic acid; the second conductive agent is an ultra-long linear carbon nanotube; and the carbon nanotube contains dispersing agent carboxymethylcellulose sodium. The stable silicon carbon negative electrode slurry having reversibility can be prepared; after the preparation of the slurry is completed, the slurry tends to be stable and is similar to jelly after standing for about 0.5 hour, the viscosity of the slurry cannot be increased with time, and settlement and stratification cannot occur with long-time placing; dispersing can be performed on the slurry before coating, and the slurry can be recovered to a flow state; and the slurry can be similar to jelly again after standing for about 0.5 hour, so that long-time storage can be achieved, follow-up coating effects cannot be influenced, and surface density is stable and leveling property is good.

The invention discloses a macromolecule water reducing agent for reducing viscosity of clay slurry as well as a preparation method and an application thereof. The water reducing agent comprises a monomer, distilled water, inorganic chain transferring agent and initiator; the weight of the monomer accounts for 25 to 40 percent of the total weight of the monomer and distilled water; the monomer comprises crylic acid and sodium allysulfonate; the weight of crylic acid accounts for 70 to 85 percent of the total weight of the monomer, and the weight of sodium allysulfonate accounts for 13 to 35 percent of the total weight of the monomer. A hydrophilic group of the polymer monomer can be well adsorbed onto the surface of particles, hydrophilic side chains can be better strength in the mortar, the characteristics such as low mixing amount and high water reducing rate can be realized; moreover, the preparation method is simple to operate; the requirement on the device is simple in the production process, no after-treatment is needed, the energy consumption is low, and the environmental pollution is avoided. The dosage in the application process of the clay is small, the water reducing effect is good, the mobility of the clay slurry can be remarkably improved, and the viscosity of the clay slurry can be reduced; and the phenomenon that the clay slurry is settled in the addition range of the dosage of the additive can be avoided.

The invention relates to a method for constructing a hot rolling swirl pool structure project by the top-down construction method. The specific method comprises the following steps: digging measurement pile foundation holes, making brick protection walls, pouring to for measurement piles, dividing the part of the outer barrel above the trapezoid-shaped bottom of the swirl pool into a plurality of sections with different heights; digging earth from the top to the bottom in sections and taking the earth wall of the dug earth as a bottom die of the outer barrel and a natural earth die of an outside die; supporting and establishing a combination steel die plate inner die on the inner side; pouring concrete together with the measurement piles; conducting the construction for the trapezoid-shaped bottom; pouring an ring-shaped bracket inside a construction joint between sections; and conducting the construction for an inner barrel of the swirl pool, a water absorption tank platform, a pump station platform and a top plate platform. In the invention, the pool outer barrel is constructed from the top to the bottom in sections by the top-down construction method, the ring-shaped bracket is poured inside the construction joint between sections, and the measurement piles are arranged in the poor outer barrel, thereby basically solves the waterproof, settlement and anti-floating problems, utilizing the construction technique and saving cost. In the hot rolling swirl pool constructed through the method of the invention, no settlement or upward-floating phenomenon occurs, no construction joint is generated, and no quality problem of water leakage or water seepage is caused.

The invention particularly relates to a normal-temperature cured conductive adhesive and a preparation method thereof. The normal-temperature cured conductive adhesive is prepared by the following method: mixing thermoplastic alcohol-soluble acrylic resin with absolute ethyl alcohol, then continuously adding a dispersing agent, a flatting agent, a thickening and anti-settling agent, white carbon black, nano-silver powder and micron-silver powder, stirring and mixing, ball-milling, filtering and filling. The prepared conductive adhesive is high in curing speed, long in application period and good in adhesion, and can be well used as a conductive adhesive for an electronic device such as an LCD (liquid crystal display) liquid crystal screen and used for conducting static electricity.

The invention provides a phenolic foam heat insulation board and a production method thereof. The heat insulation board comprises 70-80 parts of phenolic resin, 5-10 parts of modified nano-silica, 4-8 parts of a toughening agent, 3-6 parts of a surfactant, 10-15 parts of a curing agent and 4-8 parts of a foaming agent. The production method comprises the following steps: 1, preparing the modified nano-silica: dissolving nano-silica in ethyl acetate, carrying out water bath heating to 40-60 DEG C, adjusting the obtained solution to 8-9 by using ammonia water, adding a silane coupling agent, carrying out a reaction for 18-24 h, and carrying out centrifuging and washing to obtain the modified nano-silica; 2, uniformly mixing the phenolic resin, the modified nano-silica, the curing agent and the toughening agent at 50-60 DEG C to obtain a mixture A; and 3, mixing and uniformly stirring the mixture A, the surfactant and the foaming agent, rapidly pouring the obtained mixture into a preheated die, foaming the mixture, and curing the mixture to obtain the heat insulation board. The heat insulation board has the advantages of high strength, high oxygen index, good toughness and low heat conduction coefficient.

The invention relates to the field of paint manufacturing, in particular to water-based environment-friendly matte aluminum powder metallic paint and a preparing method thereof. According to the formula, the metallic paint comprises, by weight, 50-60 parts of water-soluble acrylic resin, 3-5 parts of amino resin, 2-6 parts of superfine silica, 8-12 parts of water-based aluminum paste, 2-7 parts of metal orientation agents (CMCAB), 0.5-1.5 parts of water-based dispersant, 0.1-0.3 part of water-based defoamer, 0.1-0.3 part of wetting agent, 0.1-0.8 part of amine neutralizer and the balance deionized water. As the water is used as diluent, usage of organic solvent in the coating industry is reduced, shrinkage cavity and pinhole phenomena can be avoided, and the levelling performance is high; sagging can be effectively prevented, aluminum powder arrangement is improved, and aluminum powder can be arranged in order. The coating film gloss of the water-based environment-friendly matte aluminum powder metallic paint can reach over 95 degrees when the incident angle is 60 degrees.

The invention discloses a composite lignin-base viscosity breaker for a drilling fluid and a preparation method thereof. The preparation method comprises the following steps: (1) carrying out sulfonation reaction to obtain lignosulfonate; (2) preparing ferrimanganic salt; and (3) preparing ferrimanganic lignosulfonate. In the composite lignin-base viscosity breaker for a drilling fluid, the water-insoluble substance content is at most 0.5%, the calcium sulfate content is at most 1.0%, the iron content is 3-5%, the complexation degree is at least 75%, and the relative molecular weight Mn is 5000-20000. The method has the advantage of low production cost; and the prepared viscosity breaker can display favorable viscosity breaking effect of the inorganic viscosity breaker, and also has favorable temperature resistance and salt resistance of the lignin viscosity breaker, thereby having favorable synergistic action. The preparation technique is simple and does not generate secondary pollution.

The invention discloses a water-permeable pavement with a purifying function. The water-permeable pavement comprises a water-permeable concrete surface course, a nonwoven geotextile course, a water-permeable foam concrete base course, a cement-lime stabilized soil base course and an original dirt road base course from top to bottom in sequence, wherein water collecting and draining pipes are arranged in the water-permeable foam concrete base course. According to the water-permeable pavement, a traditional gravel course is replaced by water-permeable foam concrete, nonwoven geotextile is laid between the water-permeable foam concrete base course and the water-permeable concrete surface course, and the nonwoven geotextile not only has favorable water permeability, but also can block solid pollutants in rainwater, maintain the load-carrying property of the overall structure and effectively prevent the development of reflection cracks; the water-permeable foam concrete can filter out fine solid pollutants in rainwater, and the acidic environment in the water-permeable foam concrete can enrich various microbes to purify organic pollutants in rainwater; and the water-permeable foam concrete also has a favorable thermal-insulation property, and can protect the pavement structure at lower temperature and provide a favorable living environment for the microbes.