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Enhanced magnesium oxysulfate cement, and method for making sheets by using cement

A cement preparation and magnesium oxysulfide technology, applied in the field of enhanced magnesium oxysulfide cement, can solve problems such as metal corrosion, moisture absorption and brine return, and frosting, so as to improve compressive and flexural strength, enhance cement strength, and improve The effect of density

Inactive Publication Date: 2015-02-04
NG TERASUN AIR DUCT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, magnesium oxychloride cement also has disadvantages: due to the incomplete participation of magnesium chloride in the reaction, there are free chloride ions, resulting in moisture absorption, halogen return, frosting, warping and deformation, which is easy to corrode metals, and has poor weatherability
However, magnesium oxysulfate cement has the disadvantage of low strength and is not suitable for making building materials.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0016] Example: Reinforced magnesium oxysulfide cement, the cement formula components (by weight) are: 100 parts of light-burned magnesium oxide; 30-70 parts of magnesium sulfate heptahydrate; 30-70 parts of water; 50-200 parts of fiber. The pH value of the cement in this formula is between 8-9, which is weakly alkaline and does not corrode the fibers. Adding fiber increases the flexural strength of the product made by applying the cement formula. Because the fiber density is relatively low, the original weight is basically maintained while increasing the strength. At the same time, there is no free chloride ion in the cement formula.

[0017] The formula components (by weight) of the cement also contain: 0-1.5 parts of sulfuric acid, or 0-1.5 parts of phosphoric acid, or 0-20 parts of gypsum, or 0-40 parts of calcined bauxite, or 30-60 parts of metakaolin at least one of the parts. The increase of these components enhances the strength of cement.

[0018] Gypsum is select...

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PUM

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Abstract

The invention relates to an enhanced magnesium oxysulfate cement, and a method for making sheets by using the cement. The formula of the enhanced magnesium oxysulfate cement comprises, by weight, 100 parts of light calcined magnesia, 30-70 parts of magnesium sulfate heptahydrate, 30-70 parts of water and 10-200 parts of a fiber. The method for making sheets by using the enhanced magnesium oxysulfate cement comprises the following steps: mixing 100 parts of light calcined magnesia with 30-70 parts of magnesium sulfate heptahydrate and 30-70 parts of water, uniformly stirring to form a clear paste, adding 50-200 parts of the fiber into the clear paste, uniformly stirring, carrying out roll forming, or transferring the obtained mixture into a die with a required shape and carrying out press forming, and curing. The formula of the cement does not contain free chloride ions, so the phenomena of scum, moisture absorbing, warpage, iron piece corrosion and poor weather ability of products formed by using the cement are avoided; and the reduction and residue sieving of raw materials are in favor of improving the compactness of the products and improving the compression and bending resistance of the products in the product formation process.

Description

technical field [0001] The invention relates to an enhanced magnesium oxysulfide cement and a preparation method of using the cement to prepare boards. Background technique [0002] Existing cements include Portland cement, sulphoaluminate cement, magnesium oxychloride cement, magnesium oxysulfide cement, etc. [0003] The pH value of Portland cement and sulfoaluminate cement is between 11 and 13, and the alkalinity is high. When compounding glass fiber or plant fiber, there is serious alkaline corrosion to glass fiber, and xylose is formed by contact corrosion of plant fiber. Alcohol affects the strength of cement. [0004] The configuration of magnesium oxychloride cement: it is formed by turning magnesium chloride into brine with water, and then adding magnesium oxide to the brine to react. The pH value of the cement is between 8.5 and 9.0, the alkalinity is low, no alkaline corrosion occurs to medium alkali, or non-alkali glass fiber, or plant fiber, and it has good bo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/30C04B16/02C04B14/42
Inventor 支亮
Owner NG TERASUN AIR DUCT
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