Water-tolerant type magnesium phosphate cement-based material and preparation method thereof

Abstract

The invention discloses a water-tolerant type magnesium phosphate cement-based material and a preparation method thereof, and belongs to the field of cementitious materials. The water-tolerant type magnesium phosphate cement-based material provided by the invention is prepared from magnesium oxide, a complex phosphate compound, borax, a sodium silicate solution, a fermentation filtrate, fluorocarbon emulsion and water; and the fermentation filtrate is prepared by fermenting egg yolk and duck livers and filtering a fermentation product. The water-tolerant type magnesium phosphate cement-based material and the preparation method have the beneficial effects that through waste utilization, the complex phosphate compound with a hydrophobic surface is prepared by using phosphoric acid plant waste water rich in phosphoric acid and phosphorus-containing excess sludge of a domestic sewage treatment plant, and then is treated by surface modification by using plant polyphenol rich in aromatic groups under the action of microorganisms, so that the water tolerance of the magnesium phosphate cement-based material is further improved; by adding the sodium silicate solution, the fermentation filtrate rich in nitrogen, phosphorus and sulphur elements and the fluorocarbon emulsion in cement raw materials, the water tolerance of the magnesium phosphate cement-based material is improved again, and the matrix strength is improved at the same time.

Description

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AI Technical Summary

Benefits of technology

This patented technology involves utilizing wastes containing both phosporous (P) or organophilically bound P2O5), ammoniacal acids, iron salts, chromite, etc., along with residual liquors left over after purification processes like flushing out heavy metals during production process. By mixing them together at specific temperatures for reaction, new chemical compositions can be created without losing their effectiveness due to poor hydrability caused by insufficient addition of certain ingredients such as lime or gypsum. These novel products have improved properties compared to existing alternatives but they still maintain good performance when mixed properly.

Problems solved by technology

This patented problem addressed in this patents relates to improving the properties of magnetically hardened calcium phosphosilicate compositions used in construction or repairing works due to their ability to resist attack caused by various substances such as acids, bases, dyes, salts, etc., while also being able to maintain sufficient mechanical integrity even after they have been exposed over time through environmental factors like rainwater.

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