The book "Environment, Health and Negative Oxygen Ion" edited by Chinese Academy of Sciences experts, Tsinghua University Ph.D. and Professor Lin Jinming has repeatedly said that when the concentration of indoor air negative ions reaches 20,000 per cubic centimeter, the amount of dust in the air will Reduced by more than 98%. Therefore, in the air containing high concentrations of ecological-grade air anions, the most harmful impurities such as dust, formaldehyde and other toxic gases, bacteria and viruses with a diameter of less than 1 um in PM2.5 are almost zero.
Some inorganic coating products are not able to absorb the free formaldehyde in the air after the adsorption function is not strong, so these coating brands began to seek negative ions to save lives. However, in order to achieve the high-efficiency purification rate of formaldehyde, some brands illegally add negative ion release materials, such as negative ion powder and tourmaline, which lead to radioactivity exceeding the standard. CCTV's “Weekly Quality Report” has been reported.
Negative ions to formaldehyde are undeniable. The key point here is to emphasize high-concentration ecological-grade negative ions. The concentration of artificial anions produced by adding various materials is generally 11,500/cm 3 .
According to data collected by Professor Ye Zhengtao from the Taiwan University of Science and Technology, the negative ion concentration is 200-400/
Cubic centimeters can "weakly improve the health of the body", and the "negative ion functional coating" (HG/T 4109-2009) standard requires that the negative ion induced amount of not less than 350 units meets the standard. Therefore, the addition of negative ions to the interior wall paint is basically a icing on the cake, and should not be used as a main function propaganda.


However, some functional interior wall paint manufacturers use negative ions as a main function to promote formaldehyde, and artificially increase the amount of negative ions. Therefore, there is a potential for illegal addition, which leads to potential risks of radioactivity. Therefore, please be careful when considering functional coatings. select.