33 results about "Monoisopropanolamine" patented technology

The present invention relates to a preparation method of an intelligent self-repairing, flame-retardant and light-resistant water-based polyurethane coating. The method comprises the following steps: preparing a self-made hyperbranched flame retardant and using it in the synthesis of a polyurethane prepolymer; cooling the mixture to 58° C., adding 2,2-dimethylolpropionic acid, reacting the mixture for 1 to 2 hours, adding 1 to 2 parts of a disulfide compound, reacting the mixture for 1 to 2 hours at 60 to 80° C., adding 1 to 2 parts of a hydrogen bonding agent, reacting the mixture for 1 hour at 60 to 80° C., adding 0.5 to 1.5 parts of a coumarin derivative, and reacting the mixture for 60 to 90° C. The mixture was stirred for 1-2 hours, and then spiropyran, diethanol monoisopropanolamine, and 0.01 parts of p-toluenesulfonamide were added, and the mixture was reacted at 50°C for 30 minutes. The temperature was lowered to 40-45°C, and 1-2 parts of triethylamine were added, and the mixture was reacted for 1-2 hours. The mixture was cooled to room temperature, and 60-65 parts of water were added. The mixture was stirred at a speed of 1800-2000 r / min for 0.5-1 hour to obtain an intelligent self-healing, flame-retardant, and light-resistant water-based polyurethane coating. The flame retardancy and self-healing properties of the obtained water-based polyurethane were significantly improved.

The invention discloses a low-carbon cement concrete steam curing reinforcing agent and application thereof, the reinforcing agent for high-iron phase cement clinker is obtained through screening, and the reinforcing agent can adapt to a steam curing process and rapidly improve the early strength and the final strength of a concrete member. The reinforcing agent comprises the following components in parts by weight: 0.5-5 parts of nano calcium carbonate, 0.02-0.2 part of an alcohol amine additive, 0-2 parts of inorganic salt and 0.01-0.2 part of a surfactant, the alcohol amine additive is selected from diethanolisopropanolamine, monoethanolisopropanolamine, triethanolamine and triisopropanolamine, the inorganic salt is selected from aluminum sulfate, sodium metaaluminate, sodium chloride, sodium sulfate and calcium chloride, and the surfactant comprises at least one of polydimethylsiloxane, fluorosiloxane and ethylene glycol siloxane. According to the invention, by adjusting the temperature system and reinforcing agent components before steam curing, the problem of effect reduction caused by combination of an alcohol amine reinforcing agent and a steam curing process is reversed, so that the reinforcing agent and the steam curing process generate a synergistic effect.

The invention belongs to the technical field of raw material preparation, and particularly relates to a production method for co-production of isopropanolamine and DL-2-aminopropanol. The production method for co-production of isopropanolamine and DL-2-aminopropanol comprises the following steps: adding ammonium carbonate, ammonium carbamate, epoxypropane and water into a high-pressure reaction kettle, uniformly stirring, heating to 88-90 DEG C, preserving heat for 30-35 minutes under 0.8 MPa, then heating to 100-103 DEG C, reacting for 40-45 minutes under 1.0 MPa, cooling to room temperature, filtering, washing, and drying to obtain the DL-2-aminopropanol. And after the reaction is finished, carrying out post-treatment to obtain a mixture of isopropanolamine and DL-2-aminopropanol. According to the production method for co-production of isopropanolamine and DL-2-aminopropanol, the process is simple, parameters are easy to control, reaction conditions are relatively mild, it is guaranteed that a large amount of monoisopropanolamine and DL-2-aminopropanol are generated, and meanwhile generation of by-products diisopropanolamine and triisopropanolamine is reduced.

The present invention provides a heat damage inhibitor composition for hair that suppresses heat-induced damage to the hair and maintains smooth texture and manageability even after heat treatment. [Solution] A heat damage inhibitor composition for hair, comprising (A) an arginine derivative represented by general formula (1) and (B) an anionic water-soluble polymer, wherein the weight blending ratio ((A) component / (B) component) is 0.5 to 10.0. TIFF2026049878000009.tif3864 (In general formula (1), M is a hydrogen atom, an alkali metal, an alkaline earth metal, or an alkanolamine such as monoethanolamine, diethanolamine, triethanolamine, monoisopropanolamine, diisopropanolamine, or triisopropanolamine.)

The invention relates to the technical field of concrete admixtures, and particularly discloses an anti-crack inorganic polymer silicon-aluminum polymer admixture as well as a preparation method and application thereof. The method comprises the following steps: (1) adding an alkalizer and a co-stabilizer into an aluminum sulfate solution, and carrying out continuous stirring treatment under heating and heat preservation conditions to obtain a precursor solution; and (2) adding diethanolisopropanolamine into the precursor liquid, continuously stirring under the conditions of heating and heat preservation, standing the obtained reaction liquid to naturally precipitate, and taking the supernate after the reaction is completed. And (3) heating the supernate, adding fluosilicic acid under a stirring condition, and then preserving heat to obtain the admixture. The inorganic high-molecular silicon-aluminum polymer admixture obtained by the invention can be subjected to in-situ reaction with a large amount of Ca < 2 + > generated by hydration reaction at the early hardening stage of concrete to form a high-strength gelling product, so that the tensile strength of the concrete is improved, and the crack resistance of the concrete is improved.

The invention discloses a kind of low carbon cement concrete steam curing strengthening agent and application thereof, the present invention screens and obtains a kind of strengthening agent for high iron phase cement clinker, and the strengthening agent can be adapted to steam curing process, and quickly improves the early strength and ultimate strength of concrete member.The strengthening agent includes 0.5-5 parts of nano-calcium carbonate, 0.02-0.2 parts of alcoholamine additives, 0-2 parts of inorganic salts, 0.01-0.2 parts of surfactants; Alcoholamine additives are selected from diethanol monoisopropanolamine, monoethanol diisopropanolamine, triethanolamine, triisopropanolamine, and inorganic salts are selected from aluminum sulfate, sodium metaaluminate, sodium chloride, sodium sulfate, calcium chloride, and the surfactant includes at least one of polydimethylsiloxane, fluorosilicone, and ethylene glycol siloxane.The present invention reverses the effect decline problem caused by the combination of alcoholamine strengthening agent and steam curing process by adjusting the temperature system and strengthening agent component before steam curing, so that strengthening agent and steam curing process produce synergistic effect.

The invention discloses a preparation process of calcium hydroxide with high specific surface area, which comprises the following steps: by taking industrial-grade high-quality lime as a raw material, adding diethanolisopropanolamine into water to prepare a modifier solution, firstly putting the lime into a closed high-temperature still kettle, then adding the modifier solution, stirring, heating and preserving heat to maintain the pressure, and reacting for 2-4 hours; after the digestion is finished, obtaining a calcium hydroxide powder product with high specific surface area; a novel modifier with a remarkable effect is adopted, a common dry digestion process is improved by combining heating and pressure applying in a closed digestion device, the effect of improving the specific surface area of calcium hydroxide by the modifier is optimized, the method is a single-stage digestion process, the technological process is simple and convenient, consumed time is short, and the method is suitable for industrial production. The complex steps of a multi-stage digestion technology are omitted, no other waste is generated in the preparation process, and the method can be widely applied to production and preparation of calcium hydroxide with the high specific surface area and has great significance in improving the market competitiveness of the calcium-based desulfurizing agent.

The present application relates to the field of cement additives, and more specifically, it relates to a cement grinding aid and a preparation method thereof. A cement grinding aid comprises the following raw materials in parts by weight: 3-7 parts of diethanolamine, 1-4 parts of ammonium acetate, 5-10 parts of diethanol monoisopropanolamine, 2-5 parts of calcium carbonate, 50-70 parts of water, and 0.2-0.8 parts of cellulose; its preparation method is: adding diethanolamine, ammonium acetate, and diethanol monoisopropanolamine to water and mixing until uniform; continuing to add cellulose and stirring and mixing; continuing to add calcium carbonate and mixing, and obtaining a finished product after uniformity. The present application has the advantage of improving the grinding aid effect of cement added with fly ash.

This invention discloses a liquid accelerator for concrete with adjustable setting time and its preparation method. The liquid accelerator comprises the following raw materials by weight percentage: 40%-45% polyaluminum sulfate, 3%-5% phosphoric acid, 0.1%-0.5% reactive initial setting component, 2%-4% final setting component, 1%-2% water-soluble polyvinyl alcohol, and the remainder being water. The reactive initial setting component includes polyethylene glycol diglycidyl ether and dendritic polylysine; the final setting component includes diethanolamine monoisopropanolamine and carboxytetraethylene glycol monomethyl ether. The initial setting time and final setting time of the liquid accelerator of this invention can be controlled separately. Specifically, the initial setting time of the accelerator is controlled by controlling the content of polyethylene glycol diglycidyl ether and dendritic polylysine; the final setting time of the accelerator is controlled by controlling the content of diethanolamine monoisopropanolamine and carboxytetraethylene glycol monomethyl ether.

The invention relates to an efficient cement grinding aid for enhancement. The grinding aid is prepared from the following components in parts by mass: 20 to 40 parts of diethanolisopropanolamine, 5 to 15 parts of diethylene glycol, 15 to 25 parts of white sugar, 0.2 to 0.4 part of sodium sulfite, 5 to 10 parts of cement metal ion complexing agent and 10 to 60 parts of water. Meanwhile, the invention also discloses a preparation method of the cement grinding aid. The concrete reinforcing agent has an excellent reinforcing effect, the molecular polarity and adsorption capacity can be effectively reduced, and the competitive adsorption capacity with concrete admixtures such as a water reducing agent is weakened, so that the compatibility with the concrete admixtures is improved.

The invention discloses a setting-time-adjustable liquid accelerator for concrete and a preparation method of the setting-time-adjustable liquid accelerator. The liquid setting accelerator comprises the following raw materials in percentage by weight: 40%-45% of polyaluminum sulfate, 3%-5% of phosphoric acid, 0.1%-0.5% of a reaction type initial setting component, 2%-4% of a final setting component, 1%-2% of water-soluble polyvinyl alcohol and the balance of water. The reaction type initial setting component is prepared from polyethylene glycol diglycidyl ether and dendritic polylysine; the final setting component is prepared from diethanolisopropanolamine and carboxyl tetraethylene glycol monomethyl ether. The initial setting time and the final setting time of the liquid accelerator can be respectively regulated and controlled. Specifically, the initial setting time of the accelerator is regulated and controlled by controlling the contents of polyethylene glycol diglycidyl ether and dendritic polylysine; the final setting time of the accelerator is regulated and controlled by controlling the content of diethanolisopropanolamine and carboxyl tetraethylene glycol monomethyl ether.

The invention belongs to the technical field of preparation of isopropanolamine, and particularly relates to a process for gas-solid phase synthesis of isopropanolamine. The gas-solid phase isopropanolamine synthesis process comprises the following steps: (1) preparing a copper-doped silicoaluminophosphate carrier; (2) preparing a modified copper-doped silicoaluminophosphate catalyst; and (3) taking epoxypropane and ammonia gas as reaction gases, taking the modified copper-doped silicoaluminophosphate as a catalyst, and carrying out gas-solid phase reaction in the fixed bed reactor to prepare the isopropanolamine. According to the process for gas-solid phase synthesis of isopropanolamine, copper-doped silicoaluminophosphate is used as a catalyst carrier, cobaltosic oxide and ferric oxide are loaded as catalyst active components, and the process is applied to gas-solid phase reaction of epoxypropane and nitrogen to prepare isopropanolamine. Due to the addition of the catalyst, ring opening of epoxypropane is effectively activated while the activation energy of the nucleophilic reaction of ammonia gas is reduced, the content of monoisopropanolamine in a product is increased, and the content of diisopropanolamine and the content of triisopropanolamine are reduced.

The present invention relates to the technical field of road construction, and specifically relates to a soil stabilizer, a layered road surface structure and a construction method thereof. The soil stabilizer provided by the present invention realizes the reuse of solid wastes such as waste mine soil at the construction site, and has the characteristics of low carbon and environmental protection. In this soil stabilizer, the solid waste synergistically acts with polyacrylamide, β-naphthalene sulfonate formaldehyde condensate, diethanol monoisopropanolamine, calcium chloride and amino sulfonate superplasticizer, and has good solidification ability and waterproof ability for various soils. It can aggregate and solidify loose soil particles under both dry and wet conditions, and the solidified soil has a high compaction density and compressive strength (the unconfined compressive strength after 7 days of solidification is higher than 2MP). Therefore, this soil stabilizer is an ideal low-carbon and environmentally friendly heavy-duty road construction material.

The invention discloses an anti-corrosion preservative for shotcrete and a preparation method and application thereof, and belongs to the technical field of chemical additives for building materials. The preparation method of the anti-corrosion preservative for shotcrete of the invention comprises the following steps: mixing water, n-decanoic acid, ammonia water, and a hydration aid, then adding a nano-SiO2 / perfluorooctyl acrylate composite emulsion, stirring and mixing, and obtaining the anti-corrosion preservative for shotcrete; the hydration aid is triethanolamine, triisopropanolamine, diethanol monoisopropanolamine and diethanolamine in a mass ratio of 4:4:4:2. After adding the anti-corrosion preservative of the invention, the shotcrete can have excellent chloride ion resistance and sulfate erosion resistance, can reduce the rebound of the shotcrete, and will not cause the strength of the concrete to decrease.

The invention discloses a method for synthesizing diethanolisopropanolamine under catalysis of solid base, which comprises the following steps: taking diethanol amine and epoxypropane as raw materials, and taking solid base as a catalyst to catalyze the diethanol amine and epoxypropane to carry out ring-opening addition reaction to synthesize the diethanolisopropanolamine, wherein the solid alkali is an Mg-Al-O composite oxide prepared by taking a liquid A and a liquid B as raw materials, preparing a hydrotalcite precursor by adopting a coprecipitation reaction, and roasting the hydrotalcite precursor; the liquid A is a mixed aqueous solution of Mg < 2 + > and Al < 3 + >, and the liquid B is a mixed aqueous solution of NaOH and Na2CO3. The solid base is used for catalyzing the diethanol amine and the epoxypropane to synthesize the diethanolisopropanolamine, the reaction activity and the DEIPA selectivity can be improved, the DEA conversion rate is larger than or equal to 98%, the DEIPA selectivity is larger than or equal to 97%, the DEIPA yield is larger than or equal to 95%, the catalyst can be repeatedly used, and the production cost and the environmental protection pressure are greatly reduced.

The invention relates to the field of cutting fluid, and particularly discloses a semi-synthetic cutting fluid composition, a metal working fluid and a preparation method of the metal working fluid, and the semi-synthetic cutting fluid composition comprises mineral oil, a nonionic emulsifier, a functional additive, a pH buffering agent, a bacteriostatic agent and the balance of water. The functional additive comprises one or more of a corrosion and rust inhibitor, an oiliness agent, a lubricating extreme pressure agent and a defoaming agent; the pH buffer agent is prepared from one or more of monoethanolamine, diethanolamine, triethanolamine, triisopropanolamine, monoisopropanolamine, 2-amino-2-methyl-1-propanol, dicyclohexylamine and ethanolamine, and the pH buffer agent is prepared from one or more of the following raw materials: sodium dodecyl benzene sulfonate, sodium dodecyl benzene sulfonate, sodium dodecyl benzene sulfonate, sodium dodecyl benzene sulfonate, sodium dodecyl benzene sulfonate and sodium dodecyl benzene sulfonate; the bacteriostatic agent comprises one or more of an isothiazolinone derivative, phenoxyethanol and polyquaternium. The metal working fluid comprises the semi-synthetic cutting fluid composition, the biological stability of the field working fluid can be effectively controlled in the aluminum alloy machining process in a manner of compounding organic alkali and a specific bacteriostatic agent, the growth of bacteria or fungi can be inhibited, and the service life of the working fluid can be prolonged.

The invention discloses a method for preparing isopropanolamine from acrylonitrile, which comprises the following steps: mixing acrylonitrile, a tetrahydrofuran aqueous solution and a catalyst, heating and refluxing, stirring and reacting for 12-24 hours under the protection of nitrogen, cooling, filtering, and removing the catalyst to obtain an isopropanolazonitrile-tetrahydrofuran-aqueous solution; the method comprises the following steps: adding Ni powder into an isopropanol nitrile-tetrahydrofuran-water solution, mixing, adding into a hydrogenation reaction kettle, carrying out hydrogenation reaction at the reaction temperature of 70-90 DEG C, and carrying out heat preservation reaction for 10-12 hours; and cooling, discharging, and carrying out reduced pressure distillation on the feed liquid to obtain isopropanolamine. According to the method, amine is obtained through nitrile hydrogenation in the reaction process, products are single and are monoisopropanolamine, products such as diisopropanolamine and triisopropanolamine do not exist, follow-up purification is facilitated, and high energy consumption of separation is greatly reduced.

The invention discloses a special grinding aid for functional calcium carbonate and a preparation method thereof, and belongs to the field of grinding aids. The special grinding aid comprises the following raw materials: sodium oleate 23.5-24.5wt%, alcohol amine 7-8wt%, palmitic acid 0.2-0.5wt%, methanol 2-3wt%, ethanol 2.5-3.5wt%, and water as the remainder; the alcohol amine is one or a mixture of two or more of triethanolamine, triisopropanolamine, and diethanol monoisopropanolamine. The special grinding aid for calcium carbonate prepared by the present invention can improve the grinding output and grinding efficiency of calcium carbonate, reduce grinding energy consumption, and the calcium carbonate particles obtained by grinding have good dispersibility, high stability, and good physical properties.

The invention relates to the field of building materials, and discloses a low-temperature antifreeze type early-strength alkali-free quick-setting agent composition, an accelerator, and a preparation method and application thereof. The low-temperature antifreeze type early-strength alkali-free quick-setting agent composition contains aluminum sulfate, triethanolamine, a composite antifreeze agent, an alcohol compound, a stabilizer, and a pH regulator; the composite antifreeze agent is a product obtained by a method comprising the following steps: in the presence of water I, calcium nitrate, diethanol monoisopropanolamine, acrylamide, ethylene glycol and ursolic acid are contacted and reacted. The low-temperature antifreeze type early-strength alkali-free quick-setting agent prepared by the method provided by the invention has high early strength, good stability, and good antifreeze effect on concrete.

The application provides a preparation method of monoisopropanolamine, and L-threonine is dissolved in ammonia water and introduced into a reactor to perform a thermal decarboxylation reaction at a reaction temperature to obtain product monoisopropanolamine. The application can avoid the use of toxic and harmful raw materials such as propylene oxide in the existing preparation process, and has the advantages of high reaction efficiency and high reaction yield compared with the existing threonine decarboxylation route for preparing monoisopropanolamine.

The invention relates to the technical field of metal working fluids, in particular to a low-carbon total-synthesis roller grinding fluid. The invention discloses a low-carbon total synthesis roller grinding fluid. The low-carbon total synthesis roller grinding fluid is prepared from the following components in percentage by mass: 5%-10% of triethanolamine, 15%-25% of monoisopropanolamine, 8%-12% of a surfactant, 3%-6% of dicarboxylic acid, 5%-8% of organic acylamino acid and 50%-65% of water. The low-carbon total-synthesis roller grinding fluid is good in lubricating performance, long in antirust period, good in antibacterial activity, not prone to deterioration and stink, free of harmful substances, suitable for the requirements of a grinding machining process and good in market application prospect.

The invention provides a retarder for concrete and a preparation method thereof. The retarder is prepared from the following raw materials in parts by weight: 26 to 34 parts of modified pre-gelatinized starch, 5 to 8 parts of xanthan gum, 12 to 15 parts of calcium gluconate, 9 to 13 parts of pretreated silicon dioxide, 3 to 6 parts of diethanolisopropanolamine, 2 to 5 parts of hydroxyethyl cellulose, 1 to 3 parts of disodium ethylene diamine tetraacetate, 4 to 7 parts of polyglutamic acid, 2 to 3 parts of polyoxypropylene ether, 2 to 3 parts of acrylate and 20 to 30 parts of water. The retarder disclosed by the invention is compounded by taking modified pregelatinized starch, xanthan gum, calcium gluconate, pretreated silicon dioxide, polyglutamic acid, polyoxypropylene ether, acrylate and the like as raw materials, a layer of protective film can be formed on the surface of cement particles, the hydration process of cement is effectively prolonged, and concrete can also keep good fluidity; therefore, the setting time of the concrete is effectively prolonged. In addition, the retarder provided by the invention also can effectively inhibit the occurrence of microcracks of concrete, so that the concrete has good later strength.

The invention provides a method for preparing high-quality isopropanolamine, which comprises the following steps: reacting propylene oxide with ammonia water, and post-treating the reaction mother liquor to obtain monoisopropanolamine, diisopropanolamine and triisopropanolamine, the total content of aldehydes and ketones in the epoxypropane used for preparing the monoisopropanolamine, the diisopropanolamine and the triisopropanolamine is controlled to be 1 to 100 ppm. According to the invention, the total amount of aldehydes and ketones in the epoxypropane raw material used in the preparation process of the isopropanolamine is controlled to be 1-100ppm, so that the generation of imine and oxazolidine impurities can be reduced, and the application of the isopropanolamine in the fields of personal care industry, medicines, pesticides and electronics can be met.

This invention discloses a method for preparing phenylbis(2-oxazoline) compounds. Under the first reaction temperature and first feed ratio conditions, isophthalonitrile and isopropanolamine are reacted as raw materials to form a phenyl-2-oxazoline intermediate containing a mononitrile. At a second reaction temperature, isopropanolamine and a supported metal oxide catalyst are added to the intermediate, and the reaction continues until the nitrile group is completely converted, yielding a crude phenylbis(2-oxazoline) product. The crude product is filtered under positive pressure to remove the catalyst, and the excess isopropanolamine is removed by evaporation of the filtrate. A crystallization solvent is added, and the mixture is stirred and crystallized. The crystal slurry is filtered and dried to obtain the phenylbis(2-oxazoline) compounds. This invention provides a simple preparation method with high product yield, recyclable catalyst, a raw material conversion rate of over 99%, a synthetic selectivity of over 95%, and a maximum process yield of over 85%.

The objective is to provide an acidic CIP cleaning agent composition and a CIP cleaning method using the same, which suppresses equipment blockage during CIP cleaning and exhibits good cleaning performance while suppressing the generation of chlorine gas even when a chlorine-based cleaning agent is used as an alkaline cleaning agent. [Solution] The present invention provides an acidic CIP cleaning agent composition comprising (A) one or more polycarboxylic acid type chelating agents selected from the group consisting of aminocarboxylic acid type chelating agents and hydroxycarboxylic acid type chelating agents, (B) one or more alkaline agents selected from the group consisting of sodium hydroxide, potassium hydroxide, monoethanolamine, diethanolamine, triethanolamine, and monoisopropanolamine, and (C) water, with a pH of 3.5 or higher and 6.0 or lower at 25°C, and a CIP cleaning method using the same.

The invention discloses a method for preparing monoisopropanolamine, which comprises the following steps: using an aqueous solution of triisopropanolamine as a raw material, mixing with liquid ammonia, and then passing it into a reactor in which an imidization catalyst is loaded on the upper part and a hydrogenation catalyst is loaded on the lower part, and hydrogen is simultaneously passed through for reaction to prepare monoisopropanolamine; the imidization catalyst is a ruthenium / tin catalyst with a Lewis acid-modified porous oxide as a carrier; and the hydrogenation catalyst is a Cu-based catalyst with a pyridine-modified silicon-aluminum molecular sieve as a carrier. The present invention uses an aqueous solution of triisopropanolamine as a raw material, first through the action of an imidization catalyst, converting all C-N bonds into C=N bonds after all the C-N bonds are cracked, and then through the action of a hydrogenation catalyst, a highly selective catalytic generation of monoisopropanolamine can be achieved.

The application belongs to the technical field of carbon ring compounds, and particularly relates to a mono-isopropanolamine synthesis reaction device and a production method. The mono-isopropanolamine synthesis reaction device comprises a moving bed body, a catalyst inlet is arranged at the top of the moving bed body, a heating disperser is arranged below the catalyst inlet, a raw material tank is connected to the heating disperser, a plurality of reaction channels are arranged at the bottom of the heating disperser, a dispersion buffer is arranged in the middle of the moving bed body, the reaction channels penetrate through the dispersion buffer, a material control assembly is arranged at the bottom of the dispersion buffer, an ammonia gas tank is connected to the reaction channels below the dispersion buffer, a stirring assembly is arranged in the dispersion buffer, and a material feeder is arranged at the bottom of the moving bed body. The reaction device realizes the integration of raw material pretreatment, segmented reaction, catalyst collection and product refining, and improves the process continuity and economy.

The invention discloses porous solidified soil as well as a preparation method and a use method thereof. The porous solidified soil is prepared from the following components in parts by weight: 300 to 500 parts of ground dry soil, 20 to 40 parts of cement, 50 to 70 parts of mineral powder, 5 to 15 parts of gypsum, 0.01 to 0.3 part of early strength agent, 0.01 to 0.3 part of foaming agent, 0.03 to 0.08 part of foam stabilizer and 200 to 300 parts of water, and the ground dry soil is obtained by drying and grinding engineering soil; the early strength agent is at least one of triethanolamine, triisopropanolamine and diethanolisopropanolamine; the foaming agent is a hydrogen peroxide solution and azodicarbonamide, and the mass ratio of the hydrogen peroxide solution to the azodicarbonamide is 1: (1.4-1.6); the foam stabilizer is nano silicon dioxide. According to the porous solidified soil, the backfilling strength is guaranteed, meanwhile, bubbles in the soil can be reserved, the soil is not prone to hardening, the growth condition of vegetation is guaranteed, and therefore the porous solidified soil serves as an ecological restoration material.

The invention discloses a special cementing material for low-shrinkage high-airtightness concrete and a preparation method thereof, and the special cementing material comprises the following components in percentage by mass: 48-63 wt% of low-heat Portland cement clinker, 6-14 wt% of sulphoaluminate cement clinker, 3-5 wt% of light calcined magnesia, 7-10 wt% of submicron silica fume, 9-18 wt% of fly ash and 6-12 wt% of glass powder. The gypsum accounts for 2-3 wt% of the total mass of the raw materials, the diethanolisopropanolamine accounts for 0.03 wt% of the total mass of the raw materials, and the pre-dispersed carbon nanotubes account for 0.1 wt% of the total mass of the raw materials. The special cementing material disclosed by the invention is reasonable in particle size distribution, and the components generate an interactive superposition effect, complement and promote each other, so that the hydrated cementing material is continuously compact, and the airtight concrete prepared from the cementing material can keep excellent airtight performance and volume stability in each stage.

The invention discloses a multifunctional composite cement admixture which comprises the following components in percentage by mass: 50-70% of a main chain polymer and 10-20% of an enhanced functional monomer which is a sulfonated melamine formaldehyde condensate, 5-15% of a slow-release retarder, wherein the slow-release retarder is phosphorylated sodium gluconate; 3-8% of a nano reinforcing agent, wherein the nano reinforcing agent is modified nano silicon dioxide with the particle size of 20-50nm; and 2-5% of an auxiliary component, wherein the auxiliary component comprises lignosulfonate and diethanolisopropanolamine according to a mass ratio of 1: 4. The prepared admixture has the advantages that the molecular design is synergistic, the grinding aid and dispersity are enhanced, the function conflict is avoided, the carbon emission in production and transportation is reduced, and the preparation method adopts a formaldehyde-free SMF modification process, so that the environmental pollution is avoided.