Soil sacrificial agent for polycarboxylate superplasticizer and preparation method of soil sacrificial agent

Abstract

The invention discloses a soil sacrificial agent for a polycarboxylate superplasticizer and a preparation method of the soil sacrificial agent. The preparation method of the soil sacrificial agent forthe polycarboxylate superplasticizer comprises the following steps: (1) in a protective atmosphere, mixing and stirring styrene and ethanol, conducting heating to 40-45 DEG C, adding an initiator A in batches, simultaneously adding acrylic acid and methallyl alcohol for reaction, conducting heating to 88-92 DEG C after the reaction, and removing redundant ethanol and water to obtain an intermediate product; and (2) adding an initiator B into the intermediate product obtained in the step (1), conducting stirring and heating to 90-95 DEG C, adding ethylene oxide for reaction, adding water for dilution after the reaction is finished, and adjusting the pH value of the system to 5-7. The soil sacrificial agent can effectively inhibit soil from gradually absorbing water and expanding, so that the water demand of concrete is reduced, the problems of quick concrete loss and large pump loss are solved, and the problems of cracking, low strength, poor durability and the like after the concreteis hardened are further solved.

Description

technical field [0001] The invention belongs to the field of concrete admixtures, in particular to a soil sacrificial agent for polycarboxylate water reducers and a preparation method thereof. Background technique [0002] Polycarboxylate superplasticizer has become a popular medium in concrete because of its high water reducing rate, good adaptability to cement, high cost performance, good slump retention, low shrinkage and good durability of the concrete prepared with it. The most widely used admixture species. However, with the rapid development of my country's high-speed, high-speed rail, real estate, municipal facilities, water conservancy and hydropower projects, the demand for concrete is huge, which in turn leads to a huge consumption of sand and gravel aggregates for the production of concrete, and high-quality sand and gravel aggregates are becoming more and more popular. The worse the shortage, the more obvious the deterioration trend of sand and gravel aggregates...

AI Technical Summary

Problems solved by technology

The main ways and shortcomings of the above patent documents to improve the mud resistance of polycarboxylate superplasticizers are as follows: 1. The solution is to compound inorganic salts and simple organic substances in polycarboxylate superplasticizers, but this method is resistant to mud The effect is limited; 2. The anti-mud agent with anti-mud performance is obtained through chemical modification, but it basically stays in the experimental stage and has not yet realized industrial application

At present, the soil sacrificial agent used for polycarboxylate superplasticizer through molecular structure design and chemical synthesis has not been reported yet.

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