Preparation method of triethanolamine modified early-strength polylactic acid water-reducing agent

Abstract

The invention relates to a preparation method of a triethanolamine modified early-strength polylactic acid water-reducing agent. The preparation method comprises the following steps: 1) selecting raw materials: selecting the raw materials; 2) stirring and dissolving polyether macromonomer, maleic anhydride and acrylic acid triethanolamine ester to obtain a uniform solution, further adding an oxidizer, and stirring to obtain the uniform solution; 3) adding a mixture of a reducer and a chain transfer agent into the uniform solution obtained in the step 2) once, and continuously stirring to obtain the early-strength polylactic acid water-reducing agent. The preparation method provided by the invention mainly has the following advantages: 1) the water-reducing rate is high, cement particles can be effectively dispersed, and the degree of hydration is improved; 2) triethanolamine can be released slowly so as to further promote hydration, improve early strength and prevent affecting the initial fluidity of slurry; 3) one-step method and one-time feeding are adopted, the process is simple, the reaction period is short, and the triethanolamine modified early-strength polylactic acid water-reducing agent can be used as an auxiliary material for being widely applied to various types of concrete.

Description

technical field [0001] The invention belongs to the field of building materials, and in particular relates to a preparation method of a triethanolamine-modified early-strength polycarboxylate water reducer. Background technique [0002] Polycarboxylate superplasticizer is a high-performance concrete admixture developed in the last ten years. It has been widely used in various concrete projects due to its excellent dispersion and dispersion retention, and has achieved good results. The traditional point of view is that the polymer water reducer mainly plays a role in dispersing, and does not have a great influence on the development of early strength, but the problem of low early strength in the actual application process is common. How to improve the early strength of polycarboxylate superplasticizer, conventional solutions are as follows: [0003] (1) Shorten the coagulation time of the polycarboxylate superplasticizer matrix by adjusting the molecular structure [0004] ...

AI Technical Summary

Problems solved by technology

It involves triethanolamine acrylate and its preparation method, but its temperature is 100-140°C, and hydroquinone is selected as the polymerization inhibitor; in the process of synthesizing the water reducer, it adopts a dropping process, which is more complicated, and the reaction temperature is 65 -80°C is obviously different from the one-time feeding of the present invention

[0008] All in all, there is no early-strength polycarboxylate superplasticizer with wide adaptability, simple process and excellent performance.

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