Epoxypropane embedded polyether modified concrete thickening agent and preparation method thereof

Abstract

The invention discloses an epoxypropane embedded polyether modified concrete thickening agent and a preparation method thereof. The preparation method comprises the following steps: stirring and dissolving epoxypropane embedded polyether, heating, adding an oxidant, stirring, dripping a mixture of acrylamide and hydroxyethyl acrylate while dripping a mixture of a reducing agent and a chain transfer agent, further stirring after the dripping operation is completed, regulating the pH value, adding a proper amount of deionized water, thereby obtaining the thickening agent. According to the prepared thickening agent, 0.1 percent of the thickening agent is added into concrete, and when the water amount for unit volume concrete is increased by 10kg, the concrete is not subjected to dissociation and seepage, and the dissociation and seepage resistance of the concrete can be obviously improved. When 2-10 percent of the product disclosed by the invention is added into a commercial polycarboxylate superplasticizer, the concrete workability can be obviously improved, the water-retaining property of the concrete is improved, and the problems such as dissociation, seepage and concrete encasing property are solved.

Description

technical field [0001] The invention belongs to the field of building materials, and in particular relates to a polyether modified concrete thickener embedded with propylene oxide and a preparation method thereof. Background technique [0002] With the development of modern engineering technology, the design of high fluidity of concrete and long-distance transportation have become the main development direction. Water reducer is an indispensable key material to achieve high fluidity of concrete. However, in the actual application process, there are still some problems, such as sensitive dosage during use, poor workability of the prepared concrete, and even segregation and bleeding, which seriously affect the quality of the project and even induce durability problems. In principle, concrete is a heterogeneous body, and the settlement of aggregate (sand) will cause the slurry to separate from the aggregate, resulting in segregation; and the further settlement of fine particle...

AI Technical Summary

Problems solved by technology

[0006] Although the above two methods can solve the problem of slurry viscosity to some extent, there are some problems, such as construction under low temperature conditions, retarder will lead to low early strength; under negative temperature conditions, retarder Generally not easy to use, therefore, the use of such thickeners is greatly restricted

However, ionic or non-ionic high molecular polymers, on the one hand, have adaptability problems with water reducers, such as polycarboxylate water reducers, which often reduce the fluidity of the system; in addition, their thickening effect is affected by the amount of The impact is too sensitive, such as an inappropriate increase in the amount of cellulose ether, which will easily cause excessive viscosity and poor fluidity of the slurry

In addition, when the sand and gravel gradation is not good, especially when the machine-made sand is used, the mixed concrete has poor workability, and problems such as segregation and bleeding (slurry) are prone to occur during the pumping process, which affects the quality of the project. The above-mentioned solution is difficult to solve the actual problem. Engineering problems

[0007] All in all, there is currently no thickener with wide adaptability, strong compatibility, simple process and excellent performance.

Images