233 results about "Defoamer" patented technology

The invention discloses an organic silicon composite solid defoaming agent for space station water treatment and a preparation method of the organic silicon composite solid defoaming agent, and relates to the technical field of defoaming agents. The organic silicon composite solid defoaming agent for space station water treatment comprises the following raw materials in parts by weight: 25-35 parts of polydimethylsiloxane, 5-10 parts of water-soluble silicone oil, 10-15 parts of white carbon black, 3-5 parts of an emulsifier, 3-4 parts of a dispersant and 25-35 parts of a carrier. The preparation method comprises the following steps: reacting 1H, 1H-perfluorohexylamine with epoxy chloropropane to generate an intermediate 1, reacting the intermediate 1 with lauryl amine to generate an intermediate 2, and reacting the intermediate 2 with amino-polyethylene glycol-carboxyl to obtain the emulsifier. The prepared organic silicon composite solid defoaming agent for space station water treatment has excellent defoaming and foam inhibition performance and good water dispersibility.

The invention discloses a fast defoaming powder defoaming agent and a preparation method thereof, and relates to the technical field of defoaming agents. The powder defoaming agent is prepared from the following raw materials in parts by weight: 30 to 40 parts of polyether modified silicone oil, 2 to 5 parts of organic silicon emulsion, 3 to 6 parts of dispersing agent, 4 to 6 parts of emulsifying agent, 1 to 2 parts of thickening agent and 50 to 70 parts of porous carrier. The powder defoaming agent prepared by the invention has good defoaming and foam-inhibiting performance, dispersing performance and thermal stability.

The present application discloses a kind of dispersing fast, low turbidity, high temperature and high pressure resistant, strong acid and strong alkali defoaming agent, which is prepared from the following components: 5-50% of white carbon black silica paste, 1-25% of capped polyether modified polysiloxane, 0.1-10% of spherical poly siesquioxane, 1-25% of compound polyether, 0.1-10% of thickening agent, 0.05-0.5% of sterilizing agent, and the balance of water, wherein the sum of the weight percentages of the components is 100%. The present application also provides a production process of the defoaming agent, which comprises the following steps: stirring the white carbon black silica paste, spherical poly siesquioxane and capped polyether modified polysiloxane with a homogenizer to mix them thoroughly, then adding the compound polyether, thickening agent and sterilizing agent, stirring them uniformly, and continuing to stir them rapidly with the homogenizer for 25-35 minutes to obtain the mixed uniform polyether modified polysiloxane defoaming agent. The purpose of the present application is to provide a defoaming agent with fast dispersion speed, low turbidity, high temperature and high pressure resistance, and strong acid and strong alkali resistance.

The invention discloses a defoaming agent for industrial automobile paint and a preparation method of the defoaming agent. The defoaming agent is prepared from the following raw materials in parts by mass: 20-40 parts of a star block polyether-siloxane copolymer; 10 to 25 parts of nano hydrophobic silicon dioxide aerogel; 30-70 parts of an alkylbenzene solvent (boiling point gt: 200 DEG C); 3 to 8 parts of epoxy group modified polyether siloxane; and 1 to 3 parts of polyether modified polydimethylsiloxane. The molecular weight range of the star block polyether-siloxane copolymer can effectively balance the defoaming property and compatibility, the siloxane chain segment of the star block polyether-siloxane copolymer destroys the elasticity of a foam film, and the siloxane chain segment cooperates with alkylbenzene to reduce local surface tension and accelerate foam rupture. The polyether chain segment and the siloxane chain segment have a synergistic effect, and the polyether chain segment adjusts hydrophilicity to adapt to different environments.

To provide a defoaming agent capable of exhibiting excellent defoaming properties (foam breaking and foam suppressing effects) and excellent surface finishing properties (cissing and foam breaking marks).SOLUTION: And at least one hydrophobic substance (C) selected from the group consisting of hydrophobic silica, fatty acid metal salts, fatty acid amides, and waxes, wherein the content of the liquid glycerin fatty acid ester (A) is 4 to 49% by weight, the content of the liquid alkylene oxide adduct (B) is 51 to 96% by weight, and the content of the hydrophobic substance (C) is 0.1 to 15% by weight, based on the weight of the liquid glycerin fatty acid ester (A) and the liquid alkylene oxide adduct (B).SELECTED DRAWING: None

The invention relates to the technical field of mortar materials, in particular to concrete antirust mortar and a preparation method thereof. The concrete antirust mortar is prepared from the following components in parts by weight: 35 to 45 parts of Portland cement, 10 to 20 parts of sulphoaluminate cement, 2 to 4 parts of a composite antirust agent, 1 to 3 parts of redispersible latex powder, 1 to 3 parts of silica fume, 2 to 4 parts of fly ash, 45 to 55 parts of quartz sand, 0.1 to 0.3 part of polypropylene fiber, 2 to 6 parts of modified polyurethane, 0.5 to 1.0 part of a water reducing agent, 0.1 to 0.2 part of a retarder, 0.3 to 0.5 part of a de-foaming agent and 15 to 25 parts of water. The concrete anti-rust mortar prepared by the invention has excellent waterproof performance, penetration resistance and chemical corrosion resistance, and can effectively inhibit the occurrence of corrosion of steel bars, thereby prolonging the service life and enhancing the durability of the steel bars.

The invention discloses an antioxidant dispersion liquid, which is prepared from the following components in percentage by mass: 20 to 30 percent of an antioxidant, 10 to 20 percent of a heat stabilizer, 5 to 10 percent of a terminating agent, 1 to 3 percent of a dispersing agent, 1 to 3 percent of an emulsifying agent, 0.1 to 0.5 percent of a de-foaming agent, 0.1 to 0.2 percent of a thickening agent and the balance of water, the heat stabilizer is magnesium-aluminum hydrotalcite with the magnesium-aluminum molar ratio of 3: 1 or 2: 1. The preparation method comprises the following steps: mixing the antioxidant, the heat stabilizer, the terminating agent, the dispersing agent, the emulsifying agent and the water, shearing and dispersing, sanding the mixed material until the particle size D50 is 1-2m, and adding the defoaming agent and the thickening agent, thereby obtaining the product. Compared with the prior art, the antioxidant dispersion liquid has excellent thermal stability, can significantly improve the whiteness and aging resistance of a PVC product after being applied to PVC, and has the advantages of simple process and low energy consumption.

The invention relates to a preparation method of a polysiloxane defoaming composition. The polysiloxane defoaming composition is prepared from silicone grease, a polyether-polysiloxane copolymer, a surfactant and polyether. The silicone grease is prepared from the following raw materials: branched polysiloxane, hydrogen-containing polysiloxane, silicon dioxide, a TQ polymer, an addition catalyst and an inhibitor; the polyether-polysiloxane copolymer is prepared from hydrogen-containing silicon resin with a spatial structure, diallyl alcohol polyether and allyl polyether through a reaction. The polysiloxane defoaming agent composition obtained by the invention has the characteristics of excellent foam control and easiness in cleaning.

This invention discloses a silicone emulsion defoamer for textiles and its preparation method. It is prepared from the following components by weight percentage: 5%-40% polysiloxane silicone paste, 0.3%-20% silicone polyether, 1%-20% emulsifier, 0.1%-5% thickener, 0.05%-0.3% bactericide, and the balance being water, with the sum of the weight percentages of all components being 100%. The stability of the emulsion under high temperature and high pressure environments is improved by using cross-linked polysiloxane silicone paste and silicone polyether with a specific structure. The cross-linked polysiloxane silicone paste provides superior defoaming and foam-suppressing performance. Utilizing the intertwined spatial structure of the high-viscosity silicone composition and the silicone polyether, the defoamer prepared by this method not only exhibits good stability under high temperature and alkaline environments but also significantly improves its late-stage foam-suppressing performance in sizing. More importantly, it enhances the compatibility between the silicone emulsion defoamer and the sizing.

The invention relates to protein powder compositions suitable for preparing a food or beverage comprising a lipid that reduces the foaming properties of the protein when the protein is mixed with a liquid or agitated in the presence of a liquid, methods for making the same and food or beverage products comprising the same. The invention also relates to the use of such a lipid as an anti-foaming agent.

A homogeneous extruded mold release composition including: less than 5 wt % of water; 30 to 80 wt % of a polyvinyl alcohol; 2 to 4 wt % of a surfactant; 10 to 40 wt % of a sugar alcohol; and 0.75 to 3.0 wt % of an anti-foaming agent; where a total of all components in the composition adds to 100 wt %. The extruded mold release composition has a solution surface tension of 24 mN / m or lower and a viscosity in a range from 80 to 300 cps when measured at 23° C. after the composition has been solubilized in water to produce a 15% to 18% by weight solution.

The invention relates to an isopentenol polyoxyethylene ether defoaming agent and a preparation method thereof, the defoaming agent is mainly prepared from a cross-linked acrylic copolymer emulsion, an alkali swelling thickener, a modified organic silicon defoaming active matter, a pH regulator (NaOH / KOH), an isothiazolinone bactericide, deionized water and the like in proportion, and the defoaming agent has excellent defoaming performance and stability. A specific auxiliary agent is added. The foam problem of an isopentenol polyoxyethylene ether product in downstream application is solved, and the defoaming agent is mainly applied to defoaming of isopentenol polyoxyethylene ether.

This invention discloses a novel siloxane defoamer synthesis and production process. The defoamer comprises 2-10 parts of hydrophobically treated fumed silica or nano-silica filler, 40-70 parts of a concentrated silicone oil composition, 40-70 parts of high-viscosity polydimethylsiloxane, and 100-150 parts of a fatty alcohol-propylene oxide polymer. Two types of concentrated silicone oil compositions are used, exhibiting diverse structures and chain lengths, totaling 16 types, with clearly defined preparation methods. The filler undergoes special hydrophobication treatment, and the preparation process includes mixing with the concentrated silicone oil, reaction heating, and centrifugal separation. The production process involves mixing the components in a specific ratio, followed by high-speed stirring, addition of oleic acid, and heating to obtain the novel siloxane defoamer. The components of this invention work synergistically to enhance defoaming and foam suppression capabilities. The process is simple, easy to operate and control, and the product has strong versatility. It performs excellently in high-viscosity oily systems, effectively solving foaming problems in various oily systems. It is low-cost, high-efficiency, and its performance is adjustable, exhibiting good stability and compatibility.

This invention relates to the field of cleaning agent technology, particularly to IPC C23G1, and more specifically to a neutral flow enhancer and its preparation method specifically for the production of aluminum cans. This invention, by adding bactericides, organic acids, pH adjusters, surfactants, auxiliary wetting agents, silicone defoamers, and deionized water, yields a neutral flow enhancer that improves drying efficiency, reduces energy consumption, and contributes to improved efficiency in subsequent printing processes.

This invention discloses a defoamer for detecting liquid level under foam in liquids containing solid particles and bubbles, comprising a particle discharge pipe, a bubble guide pipe, a bubble collecting cone, a bubble discharge pipe, a liquid guide pipe, and a liquid level testing chamber. Except for the bubble discharge pipe, all other structures are coaxially arranged with their axes perpendicular to the horizontal plane. The defoamer for detecting liquid level under foam is placed in the liquid containing solid particles and bubbles. The lower end of the particle discharge pipe is connected to the liquid containing solid particles and bubbles, and the upper end of the particle discharge pipe is connected to the bubble guide pipe. The bubble guide pipe is formed by connecting two conical tubes with the same small ends at their small ends. One large end of the bubble guide pipe is connected to the upper end of the particle discharge pipe, and the other large end of the bubble guide pipe is connected to the bottom of the liquid guide pipe.

The invention discloses a composite foamed SPC floor and a production process thereof, and relates to the technical field of scratch-resistant layered products. The composite foamed SPC floor sequentially comprises an ultraviolet absorption wear-resistant layer, a foamed polyvinyl chloride base material layer and a stable layer from top to bottom, the ultraviolet absorption wear-resistant layer is made of an ultraviolet absorption wear-resistant material, and the ultraviolet absorption wear-resistant material is prepared from the following components in parts by mass: 50 to 70 parts of polyurethane acrylic resin, 15 to 30 parts of aluminum oxide, 5 to 10 parts of nano silicon dioxide, 20 to 40 parts of polyvinyl chloride, 0.5 to 1.5 parts of a de-foaming agent, 0.3 to 1.0 part of a flatting agent and 1 to 2.5 parts of an ultraviolet absorbent. By adopting the specific ultraviolet absorbent, the aging process of the material is delayed, the appearance and performance of the floor are kept, and by reasonably designing the three-layer structure and optimizing the composition and production process of each layer of material, the interlayer binding force is enhanced, and the long-term use performance and attractiveness of the floor are ensured.

The invention relates to the technical field of foam control, in particular to a high-efficiency emulsion defoaming agent as well as a preparation method and application thereof. 2.3 to 3.5 parts of hydrophobic silicon dioxide; 57 to 66 parts of polyether; 13 to 18 parts of an emulsifier; 4.5 to 6 parts of a thickening agent; 0.7-1 part of a bactericide; 1-2 parts of a stabilizer; 220 to 265 parts of deionized water; wherein the organic silicon compound comprises high-hydroxyl silicone oil A and modified hydroxyl silicone oil B, the high-hydroxyl silicone oil A is relatively strong in hydrophilicity and can rapidly cover the foam surface and reduce the surface tension of foam so as to realize rapid defoaming, the modified hydroxyl silicone oil B with relatively strong hydrophobicity can effectively prolong the foam inhibition time, and the high-hydroxyl silicone oil A and the modified hydroxyl silicone oil B have a synergistic effect, so that the foam inhibition effect is improved. Excellent defoaming and foam inhibition effects are shown; the defoaming agent obtained in the invention has excellent defoaming and foam inhibition properties, and also has good high temperature resistance and shear resistance.

The invention relates to the technical field of photoresist materials, in particular to a super-thick dry film photoresist for copper cylinder electroplating and a preparation method of the super-thick dry film photoresist. The super-thick dry film photoresist is prepared from 38 to 48 parts of modified polyurethane acrylate, 12 to 18 parts of a first active diluent, 5 to 10 parts of a second active diluent, 5 to 10 parts of a plasticizer, 3 to 8 parts of a photoinitiator, 0.5 to 1.5 parts of a flatting agent and 0.1 to 0.3 part of a de-foaming agent, the second active diluent is trimethylolpropane triacrylate; the photoresist can form a super-thick and defect-free film layer, the adhesive force, the electroplating liquid corrosion resistance, the pattern resolution and other properties of the film layer are all improved, and the strict requirements of the copper cylinder electroplating process are met.

This invention discloses a low-conductivity coolant for microchannel water-cooled plates and its application. The coolant, by mass fraction, comprises 85-95% propylene glycol, 1-5% deionized water, 0.05-0.15% imidazole, 0.1-0.3% toluenetriazole, 0.10-0.4% sebacic acid, 0.1-0.3% benzoic acid, 3-4% triethanolamine, and 0-0.06% defoamer. The coolant is stirred evenly with deionized water, and the resulting mixture is placed in the micron-level fluid channels inside the microchannel water-cooled plate. The high-speed flow of the mixture absorbs the heat dissipated by the chip. The coolant prepared by this invention exhibits low corrosivity, high reserve alkalinity, low foaming tendency, and low conductivity. This coolant can be used safely and efficiently in microchannel structures, meeting the growing heat dissipation needs of AI big data computing centers.

The utility model discloses a defoaming device for gas well foam drainage accumulated liquid, and relates to the technical field of gas well gas recovery, the defoaming device comprises a defoaming cylinder, a first defoaming mechanism, a bearing seat, a second defoaming mechanism, a servo motor and a liquid inlet hose, the outer wall of the defoaming cylinder is respectively provided with a foam inlet pipe and a liquid drainage pipe, the first defoaming mechanism is arranged in the inner cavity of the defoaming cylinder, and the second defoaming mechanism is arranged in the inner cavity of the defoaming cylinder. The bearing seat is fixed at the bottom of the defoaming cylinder, the second defoaming mechanism is mounted at the top of the defoaming cylinder, and the servo motor is mounted at the top of the first defoaming mechanism. Through the arrangement mode that the first defoaming mechanism and the second defoaming mechanism are matched with each other, foam can be naturally ablated by a solid defoaming agent of the first defoaming mechanism, the foam can be extruded towards the first defoaming mechanism by the second defoaming mechanism, the foam can be conveniently crushed, and the foam can be conveniently defoamed by being matched with spraying of a liquid defoaming agent; and the defoaming agent is suitable for defoaming a gas well with relatively large daily water yield.

The application discloses a traceless self-sliding type rheological regulation glass rinsing water-based additive and belongs to the technical field of fine chemical water-based rinsing additives.The application takes polyethylene oxide with a molecular weight of 800,000-1,000,000 as a rheological regulation main body, and is compounded with fatty alcohol polyoxyethylene ether AEO-3, sodium citrate dihydrate, water-soluble polyether modified silicone oil, polyether silicon-free defoaming agent and deionized water, and can selectively add carboxymethylcellulose sodium preservative.The application constructs a water body rheological bunching and interface slip drag reduction double synergistic system, through the regular high-pressure water flow form of polyethylene oxide, with the help of AEO-3 activated interface and auxiliary construction of a low-resistance slip layer, accelerates the overall water flow sliding, and stably controls the high-pressure single spraying rinsing residual mark rate to be less than 3%.The application is neutral, environmentally friendly, has strong substrate compatibility, and has a wide working condition adaptation range, and effectively solves the industry pain point that glass and photovoltaic panel unmanned high-pressure rinsing is easy to leave water marks.

This detergent for an automatic washing machine contains: (a) a polyoxyalkylene-based non-ionic surfactant having a cloud point of 30-50ºC and an HLB value of 10-16; and (b) a polycarboxylic acid and / or a salt thereof. The detergent for an automatic washing machine further contains a chelating agent. The detergent for an automatic washing machine further contains an alkaline agent. The detergent for an automatic washing machine further contains an anti-foaming agent. The detergent for an automatic washing machine is used for cleaning soilage that includes at least one type selected from the group consisting of proteins, pigments, silicone-based water-repelling agents and grease.

The environment-friendly degradable insulating heat-conducting liquid is prepared from the following raw materials in parts by weight: 400 to 900 parts of synthetic hydrocarbon oil, 50 to 350 parts of synthetic ester oil, 20 to 180 parts of modified silicone oil, 5 to 15 parts of a heat-conducting agent, 5 to 10 parts of a coupling agent, 5 to 10 parts of a de-foaming agent, 5 to 20 parts of an antioxidant and 5 to 20 parts of a solubilizer. GTL base oil serves as main liquid, aliphatic acid and alcohol react to prepare the polyether modified silicone oil, the polyether modified silicone oil is formed by conducting surface modification on simethicone and introducing polyoxyethylene groups into side chain groups of the simethicone, the uniformity of the silicone oil in multi-system oil can be improved, layering is avoided, and the wettability and surface tension of the system are improved; the silicone oil is also endowed with a degradable property. On the basis of synergy of the synthesized hydrocarbon oil, the synthetic ester and the modified silicone oil, the heat conduction agent is introduced to realize integration of high insulativity, high thermal physical property and low viscosity of the composite ternary system, and meanwhile, an excellent biodegradable effect is achieved.

The invention belongs to the technical field of quenching media, and relates to a low-cooling-speed water-based quenching agent suitable for wear-resistant cast iron as well as a preparation method and an application method of the low-cooling-speed water-based quenching agent. The low-cooling-speed water-based quenching agent which takes polyvinyl pyrrolidone with medium and low molecular weight as a main raw material and is suitable for the wear-resistant cast iron is obtained, and all the components are specifically limited, so that the water-based quenching agent can be effectively applied to quenching heat treatment of the wear-resistant cast iron after being compounded with water; accurate slow-speed control in the convection cooling stage is achieved, the anti-corrosion performance of workpieces and equipment in the quenching process and subsequent procedures is guaranteed, the stability in long-term use is guaranteed, it is guaranteed that all performance indexes such as rust resistance, foam resistance, biological stability and the pH value of the quenching liquid are kept stable in long-term use, and the service life of the quenching liquid is prolonged. The harsh requirements of industrial continuous production are met.

This invention discloses a high-efficiency separation method for gypsum in calcium-based desulfurization based on slurry density control, relating to the field of industrial flue gas purification. The method includes: S1, real-time monitoring of the density of the gypsum slurry in the calcium-based desulfurization system, which is about to be transported to the first-stage hydrocyclone for solid-liquid separation; S2, obtaining a target addition ratio based on a preset dynamic correlation model between slurry density and defoamer addition ratio, and adding defoamer to the gypsum slurry in real-time according to the target addition ratio; S3, transporting the gypsum slurry with added defoamer to the first-stage hydrocyclone for solid-liquid separation. This method achieves precise foam suppression through dynamic control, creating an excellent separation environment for the hydrocyclone, enabling efficient separation of gypsum crystals. Simultaneously, it achieves on-demand distribution of defoamer, reducing the total amount of reagent consumed while ensuring effectiveness and saving operating costs.

The invention discloses a modified organic silicon defoaming agent as well as a preparation method and application thereof, and belongs to the field of papermaking defoaming agents. The preparation method comprises the following steps: firstly, carrying out addition reaction on hydrogen-containing silicone oil, alkyne and enol to obtain an alkyne modified organic silicon defoaming agent intermediate; performing high-temperature phase inversion emulsification on the alkyne modified organic silicon defoaming agent, docosanol, octadecanol and an emulsifier to obtain the alkyne modified organic silicon defoaming agent. The modified organic silicon defoaming agent obtained by the preparation method disclosed by the invention is applied to a papermaking section, not only can quickly eliminate foams on the surface of a system, but also can remove small bubbles attached to the surfaces of fine fibers in pulp, so that the gas content of a paper machine system is reduced, the operation efficiency of a paper machine is improved, and the modified organic silicon defoaming agent has the characteristics of no toxicity, no harm, simple process and the like.

The invention relates to the technical field of plugging coatings, in particular to a mining low-breathability fireproof plugging coating and a preparation process thereof. The mining low-permeability fireproof plugging coating is prepared from the following raw materials in parts by weight: 15 to 20 parts of diphenylmethane diisocyanate, 6 to 10 parts of polyether polyol, 0.4 to 0.8 part of fatty alcohol-polyoxyethylene ether, 1.2 to 1.5 parts of a carbon layer densification promoting fireproof agent, 0.4 to 0.6 part of a BYK defoaming agent, 30 to 35 parts of Portland cement, 15 to 18 parts of perfluoropolyether sodium carboxylate modified river sand, 3 to 4 parts of dibutyltin dilaurate and 2 to 5 parts of calcium carbonate. 0.1-0.2 part of a polycarboxylate water reducing agent, 2-5 parts of water glass and 60-80 parts of deionized water. According to the invention, the carbon layer densification promoting fireproof agent is prepared, organic materials and inorganic materials are reasonably mixed, the prepared composite spray coating can be firmly adhered after being sprayed to a wall body, and the plugging material formed after solidification at normal temperature has excellent fireproof and flame-retardant properties and low air permeability.

This invention relates to a fully synthetic aluminum alloy cutting fluid. By weight, the fully synthetic aluminum alloy cutting fluid comprises the following components: a) 5-15 parts of organic acid; b) 10-20 parts of organic alcohol amine; c) 2-11 parts of self-emulsifying ester; d) 0.2-5 parts of corrosion inhibitor; e) 0-3 parts of bactericide; f) 0-0.1 parts of defoamer; h) 52-82 parts of water; wherein the self-emulsifying ester is a reaction product of a second organic acid, a polyol, and a polyether, and the molar ratio of the second organic acid, the polyol, and the polyether is 1:(0.6-1):(0.6-1). The cutting fluid of this invention, through the rational combination of its components and the addition of a specific self-emulsifying ester, can effectively improve the lubricity of water-based cutting fluids while maintaining excellent low-foaming properties. This invention also relates to a method for preparing the fully synthetic aluminum alloy cutting fluid and its applications.

The application belongs to the technical field of waterproof lock agent preparation, and particularly relates to a waterproof lock agent for fracturing and a preparation method thereof. The waterproof lock agent for fracturing is composed of the following raw materials in percentage by mass: 8.5-10% of bis-hydroxyethoxypropyl-terminated polydimethylsiloxane, 0.7-0.8% of gemini trisiloxane methyl amino propionate, 1.0-1.5% of sodium dilauryl ethoxy disulfate, 0.06-0.08% of polyether modified polysiloxane defoamer, 0.4-0.5% of cocamide propyl betaine, and the balance of water. The waterproof lock agent for fracturing is beneficial to reducing the oil-water interfacial tension and the water phase surface tension, changing the wettability of rocks, effectively weakening the capillary effect and the Jamin effect, promoting the flowback of fracturing filtrate, inhibiting water lock damage, and further protecting the reservoir permeability.

The invention discloses a preparation method and application of a concrete admixture of a low-permeability tackifier. The preparation method comprises the following steps: synthesizing an amphiphilic block copolymer with a hydrophilic-complex block and a hydrophobic-responsive block through a reversible addition-fragmentation chain transfer polymerization (RAFT) method; carrying out self-assembly on the nano-micelle and hydroxyl-terminated polydimethylsiloxane in a surfactant aqueous solution to form a composite micelle dispersion liquid; and finally, compounding with a water reducing agent and a defoaming agent to obtain the concrete admixture. The admixture prepared by the invention can form a dynamic reversible network in fresh concrete, and endows the concrete with excellent high fluidity, thixotropy and segregation resistance; in the hardening process, the siloxane component generates nano hydrophobic gel in situ under the guidance of a micelle network in an alkaline environment, and pores are permanently filled and sealed, so that the compactness and the impermeability of the concrete are greatly improved.