Gypsum plaster board and preparation method thereof

Abstract

The invention provides a gypsum plaster board. The gypsum plaster board is composed of a board core and surface protection paper. The board core comprises the following raw materials: gypsum clinker containing impurity ions, wherein the impurity ions comprise Mg<2+>, or comprise Mg<2+> and Cl<->; and magnesium oxide and expanded vermiculite nanosheets, wherein a molar ratio of magnesium oxide to the impurity ions Mg<2+> is 4-7, a weight ratio of the gypsum clinker to the expanded vermiculite nanosheet is (90-100): (0.5-12), and optionally, the content of the Mg<2+> in the gypsum clinker is 0.05 wt.% to 1.5 wt.% while the content of Cl<-> in the gypsum clinker is less than or equal to 0.2 wt.%. According to the method, Mg<2+> and Cl<-> impurity ions in the low-quality desulfurized gypsum are solidified in the hydrated salt, and the hydrated salt has the capabilities of humidity regulation, temperature control, flame retardance and the like in a gypsum-based material, so the mechanical properties and the water resistance of the gypsum plaster board are enhanced, and the toughness of the board is improved.

Description

technical field [0001] This article relates to but not limited to a construction material technology, especially to a gypsum board and its preparation method. Background technique [0002] As we all know, gypsum is a porous building material, and gypsum board is a kind of building decoration material with good performance, which has the function of fine-tuning the temperature and humidity of the environment. In order to expand the ability of the gypsum board to adjust the temperature and humidity of the environment, the existing gypsum is usually mixed with humidity control and energy storage materials. However, when the humidity control and energy storage materials are mixed, the mechanical properties of the gypsum board are often greatly reduced. This limits the development and use of functional paper-faced gypsum boards. [0003] As an industrial by-product gypsum, some flue gas desulfurization gypsum contains a certain amount of soluble impurities such as sodium ions, m...

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Problems solved by technology

In order to expand the ability of the gypsum board to adjust the temperature and humidity of the environment, the existing gypsum is usually mixed with humidity control and energy storage materials. However, when the humidity control and energy storage materials are mixed, the mechanical properties of the gypsum board are often greatly reduced. This limits the development and use of functional paper-faced gypsum boards

[0003] As an industrial by-product gypsum, some flue gas desulfurization gypsum contains a certain amount of soluble impurities such as sodium ions, magnesium ions and chloride ions. Desulfurization gypsum with high content of impurity ions has adverse effects on the performance of gypsum products, for example, The paper-faced gypsum board prepared with desulfurized gypsum with high content of impurity ions is prone to problems such as separation of the board core from the paper core, frosting on the surface, and increased dosage of modified starch.

In recent years, many scientific research institutes in China have successively carried out research on the treatment and purification of industrial by-product gypsum (desulfurization gypsum, phosphogypsum, fluorogypsum, etc.). When controlling raw materials, there is relatively much understanding of the impact of chloride ions, but Magnesium ions are often not paid enough attention, and there are few reports on the use of low-quality desulfurized gypsum with high impurity ion content to prepare functional plates

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