High-early strength antifreezing polycarboxylate high performance water reducing agent and preparation
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A technology of polycarboxylate and water reducing agent, which is used in the preparation of early-strength antifreeze type polycarboxylate water-reducing agent, the preparation of early-strength antifreeze type polycarboxylate water-reducing agent, and the fields of concrete and ready-mixed mortar, can solve the problem of The pore size and uniform distribution are not ideal, the alkali content of the early strength component is high, and the gas content requirements cannot be met, so as to achieve the effect of improving the antifreeze performance, improving the early strength, and reducing the loss over time
Inactive Publication Date: 2009-08-05
武汉市联合石油化工有限责任公司
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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
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Embodiment 1
[0052] An early-strength antifreeze polycarboxylate superplasticizer, the components in the priority range are formulated according to the following mass percentages:
[0053] Raw material mass percentage (%)
[0054] Polycarboxylate superplasticizer 12%
[0055] Early strength antifreeze 10.3%
[0056] Air-entraining agent 0.7%
[0057] Water 77%
[0058] An early-strength antifreeze polycarboxylate high-performance water reducer, the polycarboxylate high-performance water reducer is a graft copolymer of the following general formula, and its structural formula is:
[0059]
[0060] where: R 1 for—CH 3 or H; R 2 It is H or an alkyl group with 1-4 carbon atoms; M is H, a monovalent metal ion, a divalent metal ion, an ammonium group or an amine group; The molecular weight of the substance is determined; n is the average molar number of ethylene oxide addition 90-200.
[0061] A kind of preparation method of early-strength antifreeze type polycarboxylate superplastici...
Embodiment 2
[0072] (the synthesis of polycarboxylate water reducer, the preparation of early-strength antifreeze, the method of making of air-entraining agent are identical with embodiment 1.)
[0073] Finished product production:
[0074] Take by weighing 120Kg of the above-mentioned polycarboxylic acid high-performance water-reducer solution, add it to the reaction kettle, and in a stirring state, add 97Kg of water successively, 132Kg of the early-strength antifreeze solution, and the modified air-entraining agent of the third step in Example 1 Solution 10.8Kg, obtain the light yellow liquid product that contains solid content about 21.6% and pH value is 8.
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Abstract
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.
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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