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

Abstract

The present 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 methoxypolyethyleneglycol methacrylic ester; B, the preparation for the solution of an early-strength antifreezing agent: (1), weighing water and adding the same to the reaction kettle, and adding calcium formate to the reaction kettle, and (2), 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.

Description

technical field [0001] The invention belongs to the technical field of concrete admixtures in building materials, and more specifically relates to an early-strength antifreeze type polycarboxylate water-reducer, and also relates to a preparation method of an early-strength antifreeze type polycarboxylate water-reducer, which is suitable for winter Concrete and ready-mixed mortar of various strength grades are prepared at negative temperature. Background technique [0002] The weather in the vast northern regions of my country is usually relatively cold, and the winter can last for 4-6 months, which has a great impact on concrete engineering construction. In order to ensure the quality and progress of concrete construction, the most economical and effective method is to use concrete admixture - early strength antifreeze. With the development of the construction industry, concrete has gradually achieved high performance (high strength, high workability, high durability). In ...

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Problems solved by technology

The water-reducing components in the above-mentioned patents are all naphthalene-based water-reducing agents, which contain high sodium sulfate, high alkali content, and high alkali content in early-strength components, which will lead to the occurrence of alkali-aggregate reaction; some antifreeze groups Such as urea, etc., also release gases that pollute the environment in concrete, and some antifreeze components contain highly toxic nitrite

[0004] Although the patent CN101186462A and the patent CN101289293A both use the polycarboxylate water reducer component, the alkali content of the early strength antifreeze component, and the chloride ion content are also very low, but the air-entraining component in the antifreeze water reducer introduced by the patent CN101186462A is used alone Or simple compound use, the pore size and uniform distribution of the pores formed in the concrete are not ideal, and no foam stabilizer is used in the air-entraining agent, which will make the bubbles in the concrete unstable and easy to rupture, failing to achieve the expected content The air volume requirement will reduce the antifreeze performance; the antifreeze introduced by the patent CN101289293A has no air-entraining component, but only relies on the water reducing agent to generate air content in the concrete, and the air content is low

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