Polybasic phosphonic acid monomer, polybasic phosphonic acid polymer thereof and preparation method and application thereof

Abstract

The invention discloses a polybasic phosphonic acid monomer, a polybasic phosphonic acid polymer thereof and a preparation method and application thereof. The polybasic phophonic acid monomer is prepared through phosphorylation of a primary hydroxyl group or a secondary hydroxyl group at the terminal of polyhydric alcohols, and the polybasic phosphonic acid polymer is prepared through esterification reaction of the polybasic phosphonic acid monomer and single-chain polyether. The polybasic phosphonic acid polymer can achieve long-term stable slump loss resistance of middle and low slump degreeconcrete, can improve the workability, can improve the mechanical property and endurance quality of the concrete, and is suitable for special type projects such as nuclear power, water and electricity, super high-rise, and large volume.

Description

technical field [0001] The invention relates to the technical field of concrete admixtures, in particular to a polyphosphonic acid monomer, a polyphosphonic acid polymer, a preparation method and application thereof. Background technique [0002] With the continuous advancement of major infrastructure construction such as high-speed railways, highways, hydropower, nuclear power, and large bridges in my country, resources such as traditional natural river sand and high-quality fly ash are increasingly exhausted, and low-activity industrial waste such as artificial aggregates, coal gangue, and desulfurization ash Modern concrete has also begun to be used gradually. The adaptability of traditional admixtures in new complex component systems has become more and more prominent, such as a series of application problems such as low initial dispersion efficiency, large slump loss, and high system viscosity. Regulation gradually fell into a bottleneck, and even limited the development ...

AI Technical Summary

Problems solved by technology

These slump protection methods can only partially meet the short-term slump requirements of ordinary concrete, and it is difficult to meet the long-term slump protection requirements of high temperature and long-distance transportation of some special engineering concrete

The traditional water reducer has good initial dispersibility, but poor dispersion retention ability, while the new slump retaining agent has poor initial dispersibility, and the later growth rate is large, showing a trend of "increase first and then decrease", which is easy to cause concrete segregation Bleeding, and the slump retention time is not long enough, even if it is used in combination, it is difficult to meet the long-term slump retention requirements of high-temperature and long-distance transportation concrete, thus giving some special projects such as the Hong Kong-Zhuhai-Macao Bridge and the concrete in high-temperature areas such as Xinjiang Difficulty with application

[0009] To sum up, the method of changing the concrete mixing process to improve the fluidity of concrete is not only costly, but also unsatisfactory; the traditional compound retarder technology has a certain effect, but the effect of continuing to increase the coagulant retarder is general , It will also affect the early strength of concrete; the granulation method of water reducing agent will increase the cost, and the technical difficulty is relatively large; and although the new type of slump-preserving admixture can meet the needs of ordinary concrete, it is difficult to meet the requirements of high temperature and long distance conditions. The demand for long-term slump preservation (more than 6h) of concrete

[0010] How to develop a new type of admixture, which can not only improve the workability of fresh concrete, but also meet the requirements of strength and durability of hardened concrete under the condition of high mud content in sand and gravel; In the cement system, there is no sensitivity problem; in the cement system containing fly ash, mineral powder, stone powder or clay, there is no compatibility problem; and it is an economically suitable admixture, which becomes the existing admixture Difficulties to be overcome in agent research

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