As we all know: water-reducing agents are widely used in the market because of their efficient water-reducing properties. Regarding the preparation method, many people in the industry are confused. Today, the editor of Anhui Yulong New Materials Co., Ltd. will take you to understand
Add water and initiator to the reactor, then slowly drop into the mixed solution containing sodium allyl sulfonate, polyoxyethylene ether methacrylate, and methacrylic acid, stir and heat to 80-120 degrees Celsius, react for 4-6 hours and after the reaction is completed, add it to the connecting tube, continue to keep warm and stir for 1-2 hours to discharge, and a high-performance water-reducing agent will be obtained. Raw Material Compatibility The mass ratio range of each component of this product is: the mass ratio of sodium allyl sulfonate, polyoxyethylene ether methacrylate, and methacrylic acid in the mixed solution is 1: 8: (1-2). The described initiator is persulfate, and the dosage is 0.1%-1% of the mass of the mixed solution. The described continuous transfer agent is lauryl alcohol, and the dosage is 0.1%-1% of the mass of the mixed solution. %. Product Application This product is mainly used as a water-reducing agent, which can replace cement with more slag or fly ash, thereby reducing costs.
What are the raw materials for the synthesis of water reducing agent?
Materials: acrylic acid (AA), sodium methacrylate sulfonate (MAS), ammonium persulfate (APS), polyoxyethylene Synthesis method of base allyl ester macromonomer: Prepare acrylic acid, sodium methacrylate sulfonate, ammonium persulfate, and polyoxyethylene allyl ester macromonomer with deionized water to form an aqueous solution with a concentration of 20%. Add the monomer and initiator in batches into a three-necked flask equipped with a stirrer, reflux condenser and thermometer. After the addition is completed, keep the reaction at 75°C for a certain period of time
Characteristics of the product:
(1) In the process of product application, it can exert high dispersion performance at low output (0.2%-0.5%).
(2) It can maintain good slump retention and there is basically no loss in slump within 90 minutes.
(3) When comparing concrete with the same fluidity during application, the delayed setting time is less,
(4) The degree of freedom in the molecular structure is large, and the production of admixtures is There are many technically controllable parameters and great potential for high performance.
Other types of concrete admixtures have good compatibility.
Water reducing agent refers to a water-reducing agent that can reduce the amount of mixing water and increase the strength of concrete while maintaining the workability and cement dosage of the concrete; or it can save the cement dosage while maintaining the workability and strength of the concrete. of admixtures.
According to its water-reducing and strengthening capabilities, it is divided into ordinary water-reducing agents (also known as plasticizers) and high-efficiency water-reducing agents (also known as superplasticizers). According to the composition materials, they are divided into: (1) water-based sulfonates; (2) polycyclic aromatic salts; (3) water-soluble resin sulfonates.
Ordinary water reducing agents should be used for concrete construction where the daily minimum temperature is above 5℃. High-efficiency water-reducing admixtures are suitable for concrete construction where the daily minimum temperature is above 0°C, and are suitable for preparing high-fluidity concrete, high-strength concrete and steam-cured concrete.
Several types of water-reducing agents commonly used in the market are: naphthalene-based high-efficiency water-reducing agent, aliphatic high-efficiency water-reducing agent, amino super-speed high-performance water-reducing agent, water-reducing activator, and general sugar acid. Sodium, sodium lignosulfonate, lignosulfonate, swelling agent, etc.
The preparation method of water reducing agent is the above points, I hope it will be helpful to you. </p
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