Expanded vermiculite cement board capable of releasing negative ions and preparation method thereof

Abstract

The invention relates to an expanded vermiculite cement board capable of releasing negative ions and a preparation method thereof. The preparation method comprises the following steps: (1) weighing of raw materials: weighing the raw materials consisting of expanded vermiculite, cement, tourmalinite and an accessory by volume; (2) material mixing: uniformly mixing the raw materials under stirring by using a stirrer; (3) molding: allowing slurry obtained after uniform mixing under stirring to pass through a head box and then to be conveyed to running felt on a slurry-carrying felt conveying roller, carrying out natural dehydration and vacuum dehydration so as to form a material layer and winding the material layer onto a molding drum for molding by rolling; (4) maintenance: subjecting a molded product to normal-temperature maintenance for 3 to 6 h at first and then to steam maintenance in an autoclave at a pressure of 1 MPa and a temperature of 100 to 200 DEG C for 10 to 18 h; and (5) drying: carrying out drying at a temperature of 70 to 100 DEG C for 1 to 3 so as to obtain the expanded vermiculite cement board. Compared with the prior art, the expanded vermiculite cement board provided by the invention has the advantages of capacity of releasing negative oxygen ions, environment friendliness, good practicality and the like.

Description

technical field [0001] The invention relates to a building material, in particular to an expanded vermiculite cement board capable of releasing negative ions and a preparation method thereof. Background technique [0002] Negative oxygen ions in the air are known as "air vitamins" and "air scavenger". It can not only purify the air, but also is very beneficial to the health of the human body. It has been verified by domestic and foreign medical experts through clinical practice. The World Health Organization (WHO) regards the concentration of negative ions in the air as an important indicator of air quality, and points out that when the concentration of negative ions in the air reaches more than 1000 per cubic centimeter, it can be called clean air. However, the concentration of negative ions in modern urban life has been lower than 100 per cubic centimeter, which has reached the point where it is easy to induce physiological disorders and various diseases. In this case, t...

AI Technical Summary

Problems solved by technology

Although the decorative material has the ability to release negative oxygen ions due to the use of tourmaline, the speed and strength of tourmaline to release negative oxygen ions are relatively small, and generally speaking, it can only release negative oxygen ions within a narrow range. Therefore, if the amount of "tourmaline" added in the production process is not enough, the concentration of negative ions produced is not enough, which will have no effect on human health and air purification. If the amount of "tourmaline" added is too large, the radioactivity will exceed the standard requirements. directly endanger human health

The negative ion products mentioned above all have various serious defects, resulting in the products not yet being accepted by the market, the products have not been mass-produced so far, and the market prospect is not optimistic

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