4024 results about "Borinic acid" patented technology

A cementitious article and a method of making a cementitious article are disclosed. The cementitious article comprises a cementitious component that comprises a polyvinyl acetate type polymer, a monobasic phosphate, and optionally boric acid. Cementitious articles, such as board, are prepared such that the polyvinyl acetate type polymer, the monobasic phosphate, and optionally boric acid can be present in the cementitious core, and / or in dense layers if present. The concentration of the polyvinyl acetate type polymer, monobasic phosphate, and optionally boric acid in the cementitious article can increase from a central region A to peripheral regions B and C, respectively. In some embodiments, the polyvinyl acetate type polymer is a polyvinyl alcohol and the monobasic phosphate is monoammonium phosphate.

The invention relates to a method for preparing a C / SiC composite material through a low-cost fused silicon impregnation method, which comprises the following steps: performing calcining pretreatment on a carbon felt or graphite felt at 400-600 temperature; immersing the pretreated carbon felt or graphite felt in a melamine and boric acid solution, thus coating a boron nitride protective layer; immersing in a carbon / silicon carbide slurry water solution, performing impregnation to ensure that pores of the carbon felt or graphite felt are fully filled with carbon / silicon carbide, placing in a sintering furnace, and performing primary fused silicon impregnation treatment at 1600-1800 DEG C; immersing in liquid phenolic resin, and performing carbonization treatment under the protection of an inert atmosphere at 800-1000 DEG C to ensure that all the resin is carbonized; and finally, performing secondary fused silicon impregnation treatment to ensure that carbon produced by carbonization of the resin totally reacts with silicon to generate silicon carbide, thus obtaining the C / SiC composite material. The obtained C / SiC composite material is high in density, low in air pore and free silicon content, and favorable in material strength, toughness and frictional wear performance, and can be used for manufacturing of brake pads.

A liquid fertilizer containing wood vinegar liquid or oxalic vinegar liquid and its production are disclosed. The liquid fertilizer consists of urea 1í½20.0%, potassium phosphate 1í½20.0%, potassium nitrate 1í½20.0%, lime nitrate 0.1í½10.0%, magnesium sulfate 0.1í½5.0%, ferrous sulfate 0.1í½5.0%, manganous sulfate 0.1í½5.0%, zinc sulfate 0.1í½5.0%, cupric sulfate 0.1í½5.0%, boron sand or boric acid 0.1í½2.0%, sodium molybdate or ammonium molybdate 0.1í½1.0%, plant hormone or plant regulator, rare earth element or humus acid or pesticide auxiliaries etc. The process is carried out by proportioning and mixing. It can improve bacterium inhibiting and plant growth regulating functions.

The invention discloses a micro-porous alumina carrier and relative preparing method, which contains boric oxide and another agent selected from phosphor, silicon, zirconium, and titanium. The invention adds the boric acid into water or peptizate acid whose temperature is higher than room temperature, then adds the mixture of alumina leading material and physics expanding-hole agent to be molded, dried, and burnt to attain the final carrier. The inventive carrier contains a proper agent, with the characters of large aperture, centralized distribution hole and a certain acid. And its surface acid and aperture can be adjusted easily. Therefore, the invention can overcome the defects of present technique which can not have aforementioned characters at the same time. The inventive alumina carrier can be used in variable hydrogenation catalyst.

The invention relates to a surface modifying method of a lamellar lithium-nickel series compound oxide positive pole material, a chemical formula of which is LiNixM1-xO2, wherein M is one or more of Co, Mn and Al, and x is not less than 0.2 or less than 1. Through selecting boric acid or phosphoric acid which is capable of reacting with an ionization lithium compound on the surface of the positive pole material to generate a lithium salt which does not dissolve in water or slightly dissolve in water, or silicate ester or titanate which is capable of being hydrolyzed to obtain silicic acid or titanic acid, and a liquid phase system reacts and then is directly dried to obtain the lamellar lithium-nickel series compound oxide positive pole material, with the surface being wrapped by the lithium salt. According to the surface modifying method, the content of the ionization lithium compound on the surface of the lamellar lithium-nickel series compound oxide positive pole material is effectively reduced, a uniform lithium salt wrapping layer is formed on the surface of the lamellar lithium-nickel series compound oxide positive pole material, and thus the processing property and the storage stability of the positive pole material are improved, and the circulatory stability and high-temperature storage performance of a lithium ion battery are improved.

The invention relates to an electrothermal film and a manufacturing method thereof, belonging to the technical field of semiconductor heating. The electrothermal film is mainly prepared by adopting stannic chloride, titanium tetrachloride, stannic chloride, titanium trichloride, ferric chloride, antimony trichloride, calcium chloride, potassium chloride, cadmium chloride, stannic dioxide, stannictetroxide, hydrofluoric acid, boric acid, ethanol, isopropyl alcohol and inorganic water. By adopting the above formula, the mixture is mixed, stirred and heated to prepare into electrothermal film treating fluid, a semi-finished product of the electrothermal film is obtained by spraying the electrothermal film treating fluid at negative pressure on the electrothermal film carrier, and then silveroxide slurry is coated on the semi-finished product of the electrothermal film for baking to form a finished product of the electrothermal film. The electrothermal film has reasonable proportion andsimple manufacturing process, can be manufactured into various electrothermal film heating devices, has a working temperature capable of being up to 500 DEG C, and has wider application range. The electrothermal film of the invention also has the function of far infrared radiation, can play a role of physical therapy and health care to human body, and can help improve the quality and output of agricultural products.

The present invention concerns an electrode carrying immobilized redox enzymes such that electric charge can flow between an electron mediator group to the enzyme cofactor by the use of boronic acid or a boronic acid derivative that acts as a linker moiety between the cofactor and the electron mediator group. The invention also concerns devices and systems that make use of the electrode of the invention, such as bio-sensors and fuel cells, the electrode being one of the components thereof.

The invention relates to nano calcium carbonate-containing calcium sulfonate complex grease and a production method thereof. The grease comprises the following components in percentage by weight: 10 to 40 percent of high base-value calcium alkylbenzenesulfonate, 50 to 85 percent of base oil, 1 to 10 percent of nano calcium carbonate, 0.5 to 5 percent of boric acid, 0.5 to 5 percent of saturated fatty acid with 12 to 22 carbon atoms, 0.1 to 5 percent of anti-oxidant additive and 1 to 5 percent of composite transformation accelerator HBS. The grease and the production method have the advantages that: a nano calcium carbonate material is added into the formula of the calcium sulfonate complex grease for the first time, so that the thermal stability and extreme pressure wearing resistance of the ordinary calcium sulfonate complex grease are enhanced and a preparation and operation process is simplified. Simultaneously, the composite transformation accelerator is adopted, so that transformation speed and transformation rate are increased and production cost is lowered.

The invention discloses a compounding and a preparation method for lead-free electronic slurry used for a solar silicon photocell; according to the mass percentage, the slurry is obtained by preparing 70 to 75 percent of aluminium powders, 20 to 25 percent of organic adhesive, 1 to 5 percent of inorganic glass powders and 1 to 5 percent of additives; the aluminium powder is ball-shaped aluminium powder with the surface covered by an aluminium nitride protection layer, with the purity not less than 99.9 percent and the average grain size of 2 to 6 microns; simultaneously, organic adhesives consisting of ethyl cellulose, resin, hexadecanol, diethyleneglycol monomethyl ether, diethyleneglycol monobutyl ether, terpineol and n-butyl alcohol are added into the aluminium powder; the inorganic glass powder is silicon dioxide, boracic acid, alumina, antimony oxide and zirconia; the additive consists of Span and pump oil. The product prepared by the method of the invention has no dust generation or aluminium peeling phenomenon and achieves the requirement of no lead and environmental protection.

An inkjet recording medium including a water-resistant support, and on the water-resistant support, two or more ink receiving layers including an upper ink receiving layer and a lower ink receiving layer, each of the two or more ink receiving layers containing a pseudo boehmite alumina hydrate, wherein the upper ink receiving layer further contains a polyvinyl alcohol having a saponification degree of 90% or higher and at least one crosslinking agent selected from the group consisting of boric acid and boric acid salts, and the lower ink receiving layer further contains a polyvinyl alcohol having a saponification degree of less than 90% and at least one cross-linking agent selected from the group consisting of boric acid and boric acid salts.

The invention provides an ultraviolet light crosslinking low-smoke zero-halogen flame-retardant cable material. The cable material comprises polyolefin, a compatilizer, an inorganic flame retardant, an organic phosphorus-nitrogen-containing flame retardant, a flame-retardant synergist, a photoinitiator, an assistant crosslinker, a surfactant, an antioxidant and a lubricant, wherein polyolefin contains low-density polyethylene, an ethylene-octylene copolymer and an ethylene-vinyl acetate copolymer in the weight proportion being (10-25):(20-35):(55-65); the compatilizer is polyethylene for grafting of maleic anhydride; the inorganic flame retardant is selected from magnesium hydroxide and aluminum hydroxide; the organic phosphorus-nitrogen-containing flame retardant contains polyphosphoric acid, pentaerythritol and melamine in the weight proportion being (10-20): (4-8): (15-30); the flame-retardant synergist contains zinc borate and / or polydimethylsiloxane. The cable material has good thermal resistance and anti-aging performance, can be used at the temperature of 125 DEG C for a long time and is excellent in comprehensive mechanical performance and better in flame retardance.

A water-soluble film made from a resin composition comprising (A) 100 parts by weight of an anionic group-modified polyvinyl alcohol having a viscosity of 10 to 35 mPa·s measured at 20° C. with respect to a 4% by weight aqueous solution thereof, an average degree of hydrolysis of 80.0 to 99.9% by mole and a rate of anionic group modification of 1 to 10% by mole, (B) 20 to 50 parts by weight of a plasticizer, (C) 2 to 30 parts by weight of a filler, and (D) 0.01 to 2.5 parts by weight of a surfactant. The water-soluble film has an excellent water solubility, and is not gelled or insolubilized even if chemicals containing a boric acid substance, particularly sodium perborate, are packaged therein or even if it is put in an aqueous solution of a boric acid substance, particularly sodium perborate.

The invention relates to the production of electronic components, and discloses a method for forming anode foil for electrolytic capacitors. The ultrahigh-voltage anode foil is formed through six stages, wherein from the stage 1 to stage 5, each stage has a formation tank, and in the stage 6, three formation tanks are connected in parallel; and an acid fluid mixture containing a boric acid, a citric acid or an azelaic acid (the electric conductance and pH value thereof are adjusted by using carbon-containing inorganic salts) and ammonium hypophosphite or sodium monophosphate for improving the boiled performance of an oxidation film is filled in each formation tank. Correspondingly, the processing step is also adjusted, and the produced anode foil not only can be applied to the fields and industries of aerospace and automotive frequency converters and industrial frequency converters and the like meeting the ultrahigh voltage requirements on a withstand voltage of 700-1200V, but also is dense in oxidation film surface, high in specific volume and short in boosting time.

The invention relates to a preparation method of modified biologically-activated filter fillings, comprising the following steps of: (1) cleaning an inorganic carrier with the grain diameter of 3-8 millimetres, sequentially carrying out acid cleaning, alkaline cleaning and drying to obtain dry fillings; (2) adding the dry fillings to a metal salt solution to carry out soaking and ultraphonic, drying and sintering to obtain sintering charges; (3) naturally cooling and drying the sintering charges to obtain dry sintering charges; (4) adding the dry sintering charges to a polymeric hydrogel solution containing trace elements and nutrient salts, carrying out soaking and ultraphonic and reacting in a saturated boric acid solution or a 3% calcium chloride solution so as to obtain crosslinked fillings; and (5) drying and naturally cooling the crosslinked fillings so as to obtain the modified biologically-activated filter fillings. The invention has the advantages of simple process and easy implementation; and in addition, the obtained modified biologically-activated filter fillings can increase the activity and the number of biomembranes, shorten the membrane-forming periods of biological aerated filter fillings and enhance the sewage treatment efficiency and the stability of a biological aerated filter.

Polymeric compounds of formula I comprising boronic acid are provided. These polymeric compounds are prepared either by grafting boronic acid containing compounds (e.g. 4-carboxyphenylboronic acid) to hydrolysed poly(N-vinylformamide) or hydrolysing copolymer(s) obtained by copolymerizing vinyl group containing boronic acid monomers (e.g. -vinylphenyl boronic acid) and N-vinylformamide. These polymeric compounds are used in increasing the wet strength of paper in paper-making processes. Formula (I).

The invention relates to a multi-effect water-based composite cutting / grinding fluid which consists of water-soluble oil, cleaning agent, extreme pressure antiwear agent, antirust, antibacterial agent, complexant, solubilizer and anstatic agent. The water-soluble oil is the mixture of aminoethyl alcohol and triethanolamine oleate, the cleaning agent is anionic surfactant or nonionic surfactant, the extreme pressure antiwear agent is one or two of additives A, B, C, D, E and F, the antirust is benzotriazole and sodium benzoate, the antibacterial agent is boric acid and borax, the complexant is EDTA and the solubilizer is urea. The cutting / grinding fluid with various improved performances is non-toxic and tasteless, is an environment-friendly product and has no harm to human body and the skin of users; the operating cycle is normally more than 6 months.

The invention discloses a composite intumescent flame retardant which is composed of the following components in percentage by weight: 50-65% of acid source, 10-20% of gas source, 15-20% of carbon source and 10-20% of smoke inhibitor. The acid source is composed of at least one of ammonium polyphosphate, melamine phosphate and melamine polyphosphate, wherein the ammonium polyphosphate is crystal II ammonium polyphosphate with the average degree of polymerization of greater than 1000; the gas source is composed of at least one of melamine and dicyandiamide; the carbon source is composed of at least one of pentaerythritol and bis pentaerythritol; and the smoke inhibitor is composed of at least one of magnesium hydroxide, aluminum hydroxide and zinc borate. The invention also discloses a preparation method of the composite intumescent flame retardant.

The present invention relates to a production method of high-purity lithium hydroxide. A crystallization mother liquor waste water is obtained after production of potassium chloride by using a salt lake bittern as the raw material, a magnesium-lithium ratio of the crystallization mother liquor waste water is 200-500:1, an eligible eluant is obtained through ion sieve adsorption and elution of the crystallization mother liquor waste water, and after treatment of the eluant through the ultrafiltration membrane technology, the sectional type nanofiltration technology, the external regeneration continuous hybridization technology and the reverse osmosis technology, a reverse osmosis concentrated solution is obtained. In the reverse osmosis concentrated solution, the content of magnesium ions is <=300 ppm, the content of lithium ions is 4-6 g / L, the content of sodium ions is 3-5 g / L, the content of calcium ions is <=5 ppm, the content of sulfate ions is 1-30 ppm and the content of boron is <=400 ppm. According to the production method provided by the present invention, the reverse osmosis concentrated solution is used as the raw material, the process comprises ultrahigh pressure reverse osmosis continuous hybridization for boron-removing, continuous hybridization for sulfate radical removing, ion-exchange membrane electrolysis, and crystallizing evaporation, and by using the hybridization boron-removing technology, the ion-exchange membrane electrolysis technology and the crystallizing evaporation technology, the high-purity lithium hydroxide is obtained, with the byproducts being the boric acid and sodium hydroxide. The process is continuous, controllable, high in extraction rate, low in production cost and easy to industrialize.

The invention discloses a multi-effect semi-synthetic cutting solution. The solution is prepared by uniformly mixing the following raw material components in percentage by total mass of 100%: 10 to 14% of monoethanolamine for industrial use, 0.1 to 0.2% of benzotriazole for industrial use, 10 to 13% of boric acid for industrial use, 4 to 6% of phosphate-borate-containing water-based lubricant, 4 to 7% of tall oil fatty acid for industrial use, 8 to 12% of naphthenic oil K22, 2 to 4% of petroleum sodium sulfonate No.55, 0.5 to 1.5% of oleic acid polyoxyethylene ester for industrial use, 1.5 to 2% of 1,3,5-tri(2-hydroxyethyl)-hexahydrotriazine for industrial use, 0.1 to 0.2% of organic silicon defoamer for industrial use and the balance of water. The solution has high lubrication extreme pressure performance and is biodegradable and environment-friendly.

The invention discloses a radiation-resistant halogen-free low smoke flame retardant insulating material for cables of nuclear power plants and a preparation method. The radiation-resistant halogen-free low smoke flame retardant insulating material is prepared from the following raw materials: ethylene propylene diene rubber, phenyl siloxane rubber, magnesium hydrate, aluminium hydroxide, zinc borate, white carbon black, cerium dioxide, zinc oxide, Bis(tert-butyldioxyisopropyl)benzene, tri allyl cyanurate, 2-mercaptobenzimidazole, 2,2,4-trimethyl-1,2-dihydroquinoline, Aflux A-25, stearic acid, vinyl tris(beta-methoxyethoxy) silane, and paraffin oil by heating and mixing. The formulation and the mixture ratio are scientific and reasonable, and the process is advanced. The prepared insulating material has good radiation resistance, excellent mechanical property, good electrical property and long service life, and is a good radiation-resistant halogen-free low smoke flame retardant insulating material for manufacturing the cables of the nuclear power plants.

The invention discloses functional granular major-element water soluble fertilizer. The fertilizer comprises, by weight, 345-350 parts of urea, 210-220 parts of potassium nitrate, 240-250 parts of monopotassium phosphate, 20-30 parts of potassium sulphate, 110-115 parts of monoammonium phosphate, 11-11.6 parts of boric acid, 6-6.6 parts of EDTA chelated zinc, 7-7.7 parts of EDTA chelated iron, 3-3.9 parts of EDTA chelated manganese, 0.1-0.2 part of ammonium heptamolybdate and 5-10 parts of polyglutamic acid. Compared with the prior art, the functional granular major-element water soluble fertilizer is scientific in formula, complete in nutrition, balanced and stabilized in nutrient, capable of moisture retention and drought resistance and high in utilization rate and has the functions such as improving and restoring soil.

A method of producing desalinated water and recovering minerals from the feedwater uses membrane separation and electrodialysis brine concentration. This process can recover all of the minerals as high purity industrial minerals, including capturing the calcium and sulfate as agricultural grade gypsum and boron as high purity boric acid. In addition the process allows the use of low cost lime or dolime to produce valuable magnesium hydroxide.

The invention discloses a rare-earth modified Ti-Zr chemical passivation solution for surface treatment of aluminium profiles and a using method of the rare-earth modified Ti-Zr chemical passivation solution. The rare-earth modified Ti-Zr chemical passivation solution is characterized in that the passivation solution is a main salt for auxiliary film-formation, which takes rare-earth compounds as a Ti-Zr passivation treatment solution, and a passivation film is light yellow in appearance and has field judgement property on the quality of a formed film. A formula of the rare-earth modified Ti-Zr chemical passivation solution is as follows: each litre of solution contains 0.5g.L<-1>-10g.L<-1> of potassium fluotitanate (hexafluorotitanic acid), 0.5g.L<-1>-10g.L<-1> of potassium fluozirconate (fluozirconic acid), 0.5g.L<-1>-5g.L<-1> of cerium nitrate (ceric sulfate and ammonium ceric nitrate), 2g.L<-1>-10g.L<-1> of potassium nitrate, 0.5g.L<-1>-3g.L<-1> of sodium fluoride (potassium fluoride), 0.5g.L<-1>-1g.L<-1> of sodium dodecyl benzene sulfonate or OP-10, 0.2mL-5mL.L<-1> of nitric acid and 1g.L<-1>-5g.L<-1> of boric acid. The using method of the rare-earth modified Ti-Zr chemical passivation solution comprises the following steps of: (1) clearing dirt, such as dirt attached to an aluminium alloy; (2) pretreating the surface of the aluminium alloy; (3) carrying out passivating treatment on the surface of the aluminium alloy by using the rare-earth modified Ti-Zr chemical passivation solution; and (4) washing the aluminium alloy by using water and drying the aluminium alloy. The rare-earth modified Ti-Zr chemical passivation solution disclosed by the invention has the advantages of light yellow appearance, high film formation speed, simple process, uniformity in film layer, strong corrosion resistance, low environment pollution and the like.

The invention relates to an antistatic, halogen-free, and fire-retardant enhanced master batch dedicated for polyamide and a preparation method thereof. The fire-retardant master batch is composed of following components in parts by weight: 25 to 50 parts of PA, 15 to 30 parts of alkyl phosphinate fire-retardant, 15 to 30 parts of melamine polyphosphate fire retardant, 8 to 15 parts of zinc borate fire retardant, 4 to 6 parts of CTI improver, 1 to 1.5 parts of antistatic agent, 3 to 8 parts of flexibilizer, 0.5 to 1 part of coupling agent, 0.7 to 1.5 parts of lubricant, and 0.3 to 1 part of anti-oxidant. The sum of the weight ratio of components mentioned above is 100 wt%. The fire-retardant master batch is used to produce fire-retardant enhanced and modified nylon, meets standards of the United States underwriters laboratories (UL)-941.6mm and a higher V-0 grade, simultaneously achieves that glowing wire temperature (GWIT) is equal to or larger than 750 DEG C and the CTI value is equal to or larger than 600 V, also has a antistatic performance, meets European Union RoHS, International Electrotechnical Commission (IEC) halogen-free and Reach rule requirements, is easy to use and excellent in comprehensive performance, and does not affect color matching.

The invention relates to a magnesium alloy micro-arc oxidation electrolyte and a micro-arc oxidation method. The electrolyte comprises phytate (or phytic acid), a calcic electrolyte, and further one or more added electrolytes as follows: carbonate, silicate, boric acid or borate, and aluminate or aluminum hydroxide. The micro-arc oxidation method comprises the following steps of: pre-treatment; micro-arc oxidation; and post-treatment. The micro-arc oxidation electrolyte provided by the invention does not contain Cr<6+>, F<-> and PO4<3->, and even if strong base used is less, so that the environment is not polluted. The film obtained by the micro-arc oxidation method is smooth in surface, good in corrosion resistance and better in antibacterial performance and biological activity. According to the method, raw materials are easily available, and the method is suitable for industrialized production.

The invention relates to an aqueous culture method of anoectochilus. In the method, anoectochilus germchits are cleaned and sterilized, transplanted in a culture dish and cultured in a culture groove filled with an aqueous culture solution; each 10L of aqueous culture solution contains the following components: 650 to 800mg of calcium nitrate tetrahydrate, 50 to 60mg of ammonium nitrate, 280 to 350mg of potassium nitrate, 100 to 130mg of potassium dihydrogen phosphate, 350 to 380mg of magnesium sulfate, 0.5 to 0.8mg of potassium iodide, 2 to 5mg of manganese sulfate, 0.2 to 0.3mg of sodium molybdate, 0.1 to 0.2mg of cobalt chloride, 2 to 4mg of boric acid, 0.5 to 1mg of zinc sulfate, 0.3 to 0.5mg of copper sulfate and 3 to 5ml of iron salt solution, wherein the iron salt solution is prepared by mixing water, green vitriol and ethylenediamine tetraacetic acid disodium. The method has the advantages of lowering production cost, simplifying production process, improving the growth of anoectochilus plants and improving the survival rate of anoectochilus plants.

The invention discloses a modified phosphate casting binder and a preparation method and application thereof. The modified phosphate casting binder is synthesized and prepared by a chemical reaction from the following components in percentage by weight: 9-15% of aluminum hydroxide, 60-65% of phosphoric acid, 1-5% of boric acid, 1-3% of borax, 1-5% of citric acid, 10-20% of water and 4-15% of ethanol. The obtained binder has good chemical stability, strong moisture absorption resistance and high bonding strength. The binder disclosed by the invention is suitable for preparing a self-hardening sand mould and has the characteristics of high bonding strength, long service time of a sand mould, good performance stability of the sand mould, easy collapse of the sand mould, normal-temperature regeneration of old sand and easy sand clearing of castings, and has broad application prospects in the casting industry.

The invention provides an environment-friendly rustproof cleaning agent prepared from the following raw materials in percentage by weight: 2-5% of one or mixture of multiple of phosphoric acid or phosphate, 2-5% of one or mixture of multiple of boric acid or borate, 0-5% of strong base, 0.5-1% of anionic surface active agent, 0.5-1% of nonionic surface active agent, 0.5-1% of one or more than one of edetic acid or ethylenediamine tetraacetates and the balance of water. According to the invention, the raw materials are added into water in sequence to obtain the rustproof cleaning agent. The environment-friendly rustproof cleaning agent provided by the invention is safe and environment-friendly and has good dustproof cleaning capability.

The invention belongs to the field of building material, and particularly relates to a compound expanding agent for inhibiting temperature rising in the early stage and promoting hydration in the later stage. The compound expanding agent comprises the following raw materials by weight: 10 to 30 % of calcium oxide, 28 to 43 % of sulphate aluminium cement clinker, 25 to 40 % of anhydrite, 5 to 15 % of magnesium oxide, 0.3 to 0.5 % of boric acid, 1 to 1.5 % of zinc sulfate and 0.2 to 0.5 % of ICA. The compound expanding agent has the advantages of high early stage expanding capacity, sustainable expansion and long expanding stable period, can effectively compensate self-constriction and drying shrinkage of concrete, enables the synergetic development of the volume expansion and the strength increase of concrete, and is very suitable for being applied to steel pipe concrete and mass concrete.