Magnesium phosphate cement foamed lightweight wall building block

Abstract

The invention provides a magnesium phosphate cement foamed lightweight wall building block. The building block comprises components of, by weight: 1 part of magnesium oxide, 0.4 to 0.6 parts of magnesium sulfate, 0.3 to 1 part of fly ash or other industrial slag, and 0.2 to 2 parts of ammonium dihydrogen phosphate. According to the invention, magnesium oxide and ammonium dihydrogen phosphate are added into a container; water is added into the container, and the materials are stirred; magnesium sulfate is added into the container, and the solution is regulated to 15-30 Baume degree; fly ash or other slag is added into the container, and the mixture is well mixed; the slurry is poured into a building block mold, foamed, demolded, and cured, such that the building block is produced. With long-term tests, the building block provided by the invention is stable in a long term, and does not scumming. During the production process, air gaps are formed by the foaming agent, such that the weight of the building block is reduced, and better acoustic insulation and thermal insulation effects are provided.

Description

technical field [0001] The invention relates to a wall material, especially a material made of magnesium phosphate cement. Background technique [0002] Magnesium cement is a special kind of cement, which is mainly formed by the condensation of magnesium chloride and magnesium oxide, so it is also often called magnesium oxychloride cement. A large number of studies have shown that its product 5Mg(OH) 2· MgCl 2· 8H 2 O;3Mg(OH) 2· MgCl 2· 8H 2 0, under the observation of the electron microscope, it is oblique columnar cross-linking, with a variety of irregular spatial network structures. For more than 100 years, although people have carried out a lot of research and tests on magnesium cement, the inherent defects of magnesium oxychloride cement are still difficult to overcome. One is that it needs poor water resistance. The hydrate of magnesium cement is hydrophilic, and water can make it The crystal structure loses its stability and eventually disintegrates. The stre...

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Problems solved by technology

Third, warping deformation. Magnesium cement releases high heat during the hardening process. Its heat release is 1000-1350J / gMgO, and the central temperature of the reaction system can reach 140°C, which may exceed 150°C in summer. It is 3-4 times that of ordinary Portland cement. Due to the fast setting time of magnesium cement, the heat release is large, and the product is warped and deformed due to thermal expansion. Large-volume magnesium cement is often micro-cracked, and the micro-cracks gradually expand and deepen, and the product is broken. In this regard, the predecessors made various efforts to study various additives, select low molecular weight organic polymers, improve the reactivity of magnesium oxide and magnesium chloride, reduce the activity of magnesium chloride, etc., but did not solve the problem fundamentally, only slightly improved , some can be made into fireproof boards, but it has not yet been realized as a bulky wall material