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1044results about How to "High water reduction rate" patented technology

Plastic retaining type polyether assemblage carboxylic acid high-performance water reducing agent and preparation method thereof

ActiveCN101786824AUniform molecular structureHigh water reduction rateEtherDicarboxylic acid
The invention discloses a plastic retaining type polyether assemblage carboxylic acid high-performance water reducing agent and a preparation method thereof, mainly being applicable to the field of building materials. The water reducing agent is obtained in the following method: with the action of initiating agent, copolymerizing unsaturated polyalkyl ether monomer (A), unsaturated monocarboxylic acid and derivative monomer thereof (B), unsaturated dicarboxylic acid and derivative monomer thereof (C) and unsaturated sulfonic acid or salt monomer (D) in water solution for 2-8h at 50-80 DEG C and then reducing temperature to 35-45 DEG C, using alkaline solution to neutralize the mixture to a pH value of 5-7, thus obtaining the water reducing agent. The synthesized water reducing agent of the invention features changeable molecular structure, high water reducing ratio, high dispersion property under low dosage and fine slumps-retaining property, good adaptability to concrete raw material; in addition concrete with the water reducing agent added enjoys good peaceability; with the one-step method synthesis technology employed, the preparation method has the advantages of simple operation, low energy consumption in production and freedom from pollution.
Owner:CNBM ZHONGYAN TECH

High-early strength antifreezing polycarboxylate high performance water reducing agent and preparation

The invention discloses an early-strength antifreezing polycarboxylate high-performance water reducing agent and a method for preparing the same. The early-strength antifreezing water reducing agent is prepared from a polycarboxylate water reducing agent, an early-strength antifreezing agent, an air entraining agent and water. The method comprises the following steps: A, the synthesis of the polycarboxylate high-performance water reducing agent: (1) esterification reaction; adding methacrylic acid, and the like to a reaction kettle, and (2) polymerization reaction; heating big monomer methoxy polyethyleneglycol methacrylic ester; B, the preparation for the solution of an early-strength antifreezing agent: a, weighing water and adding the same to the reaction kettle, and adding calcium formate to the reaction kettle, and b, adding triethanolamine, and the like to the reaction kettle to prepare the early-strength antifreezing agent solution; C, the preparation of the air entraining agent: weighing water and adding the same to the reaction kettle, and adding powdered three-level colophony to the reaction kettle to obtain the air entraining agent; and D, the preparation of the finished product: weighing the polycarboxylate water reducing agent and adding the same to the reaction kettle, and adding the air entraining agent and the early-strength antifreezing agent solution to the reaction kettle. The early-strength antifreezing polycarboxylate high-performance water reducing agent has higher water reducing rate and remarkable enhancing effect, and is suitable to prepare various common concrete and high-performance concrete at a negative temperature range of between 20 DEG C below zero and 0 DEG C.
Owner:武汉市联合石油化工有限责任公司

Alkali-activated high-performance water reducer and preparation method thereof

The invention discloses an alkali-activated high-performance water reducer and a preparation method thereof. The alkali-activated high-performance water reducer comprises a composite alkali-activator, a composite water reducer, black liquor of a paper mill, a composite retarder, a composite air entraining agent, a composite thickener, a composite regulator and the balance of water. The preparation method for the alkali-activated high-performance water reducer comprises the following steps of: adding the components and water to a reaction kettle in sequence; and mixing and carrying out a reaction on the components and the water under the room-temperature environment to obtain the finished product. The alkali-activated high-performance water reducer disclosed by the invention can activate the cementitious activity of the mixed materials such as slag, coal ash, gangue and the like, has excellent adaptability to different cements and highly doped concrete, and can greatly reduce the adding amount of cement clinker. The alkali-activated high-performance water reducer has the characteristics of a high water-reducing agent, good peaceability, a remarkable reinforcing effect, a good collapse preventing effect, adjustable setting time and the like. Moreover, the external additive has a simple production process, no pollution, low energy consumption and low cost, can solve an environmental pollution problem of the black liquor of the paper mill, and has good practicability.
Owner:GUILIN HUAYUE ENVIRONMENTAL PROTECTION TECH CO LTD

Hyperbranched polymer, hyperbranched type water reducing agent of polycarboxylic acid series and preparation method and application thereof

The invention provides a hyperbranched polymer and a preparation method thereof, wherein the preparation method comprises the steps of taking methyl acrylate, ethanolamine, 2-bromoethanol and propandioic acid as raw materials to synthesize a hyperbranched poly (amine-ester) nuclear molecule comprising a bromine terminal group; taking cuprous bromide and 2,2-bipyridyl as a catalyst and a coordinating agent; respectively grafting acrylic acid and single methyl oxygen radical sealed allyl polyethylene glycol into the hyperbranched poly (amine-ester) comprising bromine terminal group by means of an atom transfer radical polymerization method so as to obtain a hyperbranched polymer. The invention further provides a hyperbranched type water reducing agent of polycarboxylic acid series mainly comprising the hyperbranched polymer and the application thereof, wherein the water reducing agent improves the faults of existing water reducing agent of which the adding quantity is large and the cement adaptability is bad and the like,. and has the advantages that the adding quantity is low, the water reducing efficiency is high, the loss of slump is less, the compatibility to the cement is good, the frozen resistance is strong and the like, the properties of the product are stable, and the water reducing agent has no tendency of layering and precipitating and has no toxicity and pollution after storing for a long time.
Owner:江苏超力建材科技有限公司

Low-cost concrete antifreezing pumping aid and preparation method thereof

The invention relates to the concrete pumping aid field, in particular to a low-cost concrete antifreezing pumping aid and a preparation method thereof. The concrete pumping aid comprises the following raw materials by weight percent: 20-30% of polycarboxylic acid water reducing agent of which solid content is 40%, 0.3-0.4% of air entraining agent, 0.9-2% of retarder, 11-15% of sulfonated acetone-formaldehyde condensate of which solid content is 36%, 6-10% of sodium lignin sulfonate, 2-4% of antifreezing component and the balance of water. The preparation method comprises the following steps: adding water, air entraining agent, polycarboxylic acid water reducing agent and sulfonated acetone-formaldehyde condensate in a container to heat to 45-55 DEG C, and stirring evenly; adding sodium lignin sulfonate in the container to stir, centrifuging to remove precipitate; and adding retarder and antifreezing component to stir evenly. The low-cost concrete antifreezing pumping aid has good performance; the composite indicators such as the antifreezing property, the pumping property, the water reducing ratio and the ratio of compressive strength are better than that of the antifreezing pumping aid which uses polycarboxylic acid water reducing agent or sulfonated acetone-formaldehyde condensate alone; and the antifreezing pumping aid in the invention has higher adaptability and good cost performance.
Owner:安徽海螺材料科技股份有限公司

Sustained-release polycarboxylic high-performance water reducing agent and preparation method thereof

The invention relates to a sustained-release polycarboxylic high-performance water reducing agent and a preparation method thereof. The water reducing agent comprises: 0.13mol of monomer methyl alkenyl polyoxyethelene or allyl polyoxyethylene ether or polyoxypropylene ether, 0.32mol of monomer acrylic acid or methacrylic acid, 0.01mol of monomer sodium methallyl sulfonate, 0.12mol of monomer acrylamide or 2-acrylamide-methylpropanesulfonic acid, and 0.05mol of monomer ethyl acetate or styrene. Deionized water is adopted as a reaction medium, and the materials are subjected to a reaction with an initiating agent and a chain transfer agent for 4-6h with a maintained temperature of 58-62 DEG C. Copolymerization is carried out, such that a polymer with a molecular weight of 50000-120000 is obtained; the temperature is reduced to below 40 DEG C, and an alkali solution is added for regulating the pH of the system to 6-8, such that the water reducing agent is obtained. The sustained-release polycarboxylic high-performance water reducing agent provided by the invention has high water reduction rate. When an equivalent solid dosage is 0.2%, a water reduction rate can reach 35%. A slump performance is good. Concrete slump and extension degree have no loss in 3h. The water reducing agent is widely adaptable with concrete raw materials.
Owner:广西云鹰新材料科技有限公司

Green preparation method of slow-release polycarboxylic-acid high-performance water reducing agent

The invention relates to a green preparation method of a slow-release polycarboxylic-acid high-performance water reducing agent, which comprises the following steps: firstly, dissolving unsaturated polyethenoxy ether in water, adding an oxidant solution, and evenly stirring; then, respectively and dropwisely adding a reducer/chain-transfer agent mixed solution and a comonomer solution, and polymerizing; and finally, adding an alkaline regulator to neutralize and age the solution, thereby obtaining the slow-release polycarboxylic-acid high-performance water reducing agent. In the invention, hydrogen on the terminal hydroxyl group of the original unsaturated polyethenoxy ether is substituted by an allyl group containing unsaturated bond, so that the terminal group of methoxypolyethylene glycol is converted from the original active hydroxyl group into the inert methoxy group at present; and thus, the byproducts of the copolymerization product are greatly reduced, and the molecular weight distribution is narrow, so that the synthesized water reducing agent has the advantages of high water reduction rate and slump resistance. The redox system with low activation energy is used for initiating the monomer copolymerization, so that the polymerization can be implemented at normal temperature, thereby implementing the production of the product by a no heat source method, simplifying the production equipment and lowering the energy consumption and cost.
Owner:NANJING RUIDI HIGH TECH

Process for preparing modified naphthalene series water reducing agent

The invention discloses a method for preparing a modified naphthalene water reducing agent, which comprises the following steps: A, adding industrial naphthalene to a glass lining reaction kettle to be melted, and adding industrial concentrated sulfuric acid to the reaction kettle; B, sampling and measuring the acid number to determine the water quantity to be added to a hydrolysis reaction; C, adding industrial formaldehyde to the mixture to perform reaction so as to obtain a naphthalene sulfonic acid formaldehyde condensation compound; D, adding pulping waste liquor and water to the mixture respectively from the top and the middle part of a formaldehyde absorption tower while adding the formaldehyde to the mixture, using a pump to perform circulating spraying on the waste liquor and the water on the upper section and the lower section of the adsorption tower respectively, and adding the waste gas generated by a condensation reaction to the lower part of the formaldehyde absorption tower so as to have a counter current contact with the water and obtain a waste liquor containing the formaldehyde; E, adding a diluted formaldehyde solution to a condensation reaction material, reducing the viscosity of the material and reclaiming the formaldehyde; F, delivering the formaldehyde pulping waste liquor to a waste liquor reaction kettle to perform sulphonation and condensation reactions; and G, preparing the modified naphthalene water reducing agent. The method achieves the zero emission of the formaldehyde with less usage; the water reducing rate of the water reducing agent is improved by 3 to 8 percent compared with the conventional product, and the utilization of an environmental pollutant pulping waste liquor is achieved.
Owner:武汉市联合石油化工有限责任公司

Hyperbranched polymer, hyperbranched polycarboxylic acid-series super plasticizer and preparation method thereof

The invention provides a hyperbranched polymer, a hyperbranched polycarboxylic acid-series super plasticizer and a preparation method thereof. The preparation method comprises the following steps of: undergoing an addition reaction and an ammonolysis reaction on alkenyl amine, polymethylmethacrylate, ethylene diamine and 2-acrylamide-2-sodium methylacrylsulfonate serving as raw materials to obtain a hyperbranched polymer with a structure shown as a formula (I), (II), (III) or (IV); undergoing a polymerization reaction on the hyperbranched polymer, an esterification monomer and a crosslinking agent; and preparing a hyperbranched polycarboxylic acid-series super plasticizer with a two-step process. The preparation method provided by the invention has the advantages of simple process, easiness for controlling a preparing process and operating, readily-available raw materials, low production cost and suitability for industrial production. Due to the adoption of the hyperbranched polycarboxylic acid-series super plasticizer, the comprehensive performance of concrete is improved. As proved by an experiment result, the hyperbranched polycarboxylic acid super plasticizer provided by the invention has high slump loss resistance, high water-reducing rate and high compressive strength.
Owner:安徽海螺材料科技股份有限公司

A polycarboxylate water reducer with high water reducing rate and high slump retention, its synthesis method and its use

The invention belongs to the technical field of building materials, and specifically relates to a polycarboxylic acid water reducer with a high water-reducing rate and high slump constant holding capacity, and its synthetic method and use method. The polycarboxylic acid water reducer comprises 2-methallyl polyoxyethylene ether (TPEG), 2-acrylamido-2-methylpropanesulfonic acid (AMPS), methacrylic acid (MAA), ammonium persulfate (APS), sodium hydroxide and water. The synthetic method comprises the following steps that 1, TPEG, AMPS and MAA are prepared respectively into mixed solutions with concentrations in a range of 20 to 50%; 2, simultaneously, APS is added with a proper amount of water and is dissolved in the water; 3, the TPEG and AMPS monomer mixed solutions prepared by the step 1 are added into a reactor; nitrogen is fed into the mixture in the reactor; a condenser tube is mounted; the mixture is heated to a temperature of 60 to 100 DEG C with stirring; the MAA monomer solution prepared by the step 1 and the APS solution prepared by the step 2 are respectively added dropwisely into the heated mixture, wherein dropwise addition time of the MAA monomer solution is in a range of 1 to 5 hours and dropwise addition time of the APS solution is in a range of 1.5 to 5.5 hours; and after the dropwise addition is finished, the mixture with the MAA monomer solution and the APS solution undergoes a reaction at a constant temperature for 1 to 2 hours; 4, reaction products obtained by the step 3 are cooled and are neutralized by a NaOH solution to form desired products. The synthetic method of the polycarboxylic acid water reducer is a one-step synthetic method and has simple processes. Products prepared through the synthetic method have the advantages of stable performances, low doping quantity, high water-reducing rate, high slump constant holding capacity and good market prospects.
Owner:KZJ NEW MATERIALS GROUP CO LTD
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