Is the paint that can "release negative ions" credible?

Buyer story:

Coating merchants advertise that the formaldehyde purification rate is 85.

The renovation of Ms.

"If there is such a function, it is worth it even if it is expensive, but can it really be like this?" Ms.

In addition, the sales staff also stated that they can go to a construction site where their paint is being used for formaldehyde testing; in addition, if the set effect is not achieved after using the paint, the original silver can be returned and the wall restored to its original shape.

Ms.

Reporter investigation:

"Formaldehyde absorption" building materials and plywood and ceramic tiles

The reporter recently came to the store mentioned by Ms.

The store also showed the reporter three pieces of information.

　　The third material is a monitoring analysis report from the "Construction Material Industry Environmental Monitoring Center": After the powder is mixed with water, it is coated on the fiberboard and dried for 7 days.

　　Coincidentally, in addition to paint, the building materials that "absorb formaldehyde and release negative ions" also found plywood and ceramic tiles on the market.

　　The ceramic tiles with negative ion function are called smart bricks by manufacturers, and have the effect of wood grain bricks, which makes people feel closer to the forest.

　　Experts explain their doubts

　　Is it feasible in theory? feasible

　　Building materials can really absorb formaldehyde and release negative ions? The reporter interviewed Hu Xiaohong, a professor in the Department of Chemistry of Foshan University of Science and Technology, and Dr.

　　For the absorption of formaldehyde, photocatalyst is the most frequently mentioned.

　　The occurrence of negative ions is generally produced in nature through lightning and plant photosynthesis.

　　What will happen in practical applications? Easy to get out of shape

　　Although in theory building materials can absorb formaldehyde and release negative ions, the two experts also said that in practical applications, the effect is often greatly compromised.

　　Wang Tao said that tourmaline can release negative ions, but the amount of release depends on the amount of addition.
This kind of thing is very expensive.
Adding in large quantities will greatly increase the manufacturer's cost, but it is effective if it is added in large quantities.
Hu Xiaohong also said that to make tourmaline powder emit negative ions, it needs to be crushed into nano-sized particles, otherwise the effect will be poor.
In fact, few people have studied it in recent years, and the relevant literature can only be found in mid-2006.

　　As for the formaldehyde absorption effect of the photocatalyst, Hu Xiaohong said, it needs light to reach a certain intensity and high enough energy to be effective.
Generally speaking, blue and violet light are required, and ordinary light has a poor effect.

　　As for the test reports produced by some merchants, Hu Xiaohong said that the products submitted for inspection can be specially made products for inspection.
Moreover, the short test time does not prove whether the materials are effective for a long time in actual applications.

　　Expert advice

　　Buy building materials

　　Want to buy environmentally friendly materials

　　Wang Tao said that there are many ways to absorb formaldehyde, but each has its own shortcomings.
For example, activated carbon is physically adsorbed and has high efficiency, but it is easy to release again.
Tourmaline can emit negative ions, but the cost is high.
The low-cost negative ion generator has an unpleasant smell and a louder sound when the arc is generated.
In addition, the phenomenon of excessive publicity in many building materials products, such as "0" formaldehyde, is a bit exaggerated.
In addition to formaldehyde, attention should also be paid to the release of pollutants such as benzene and alcohol ethers.

　　Therefore, both experts suggested that when consumers buy building materials, they should still buy environmentally friendly materials as much as possible to see if they meet the industry standards of building materials.
For example, the three plywood is divided into E0, E1, E2 and other levels.
E0 is the highest level and the formaldehyde content is the least.
The formaldehyde in the three plywood and high-density board comes from the adhesive in it, and it will slowly release the formaldehyde when it is heated at ordinary times.
In addition, the release range of formaldehyde is very wide, including trace formaldehyde in logs.

　　The most stringent paint product is the European "A+" standard.
From a health perspective, consumers are best to choose products from large companies that meet the "A+" standard.
(Source: Global Coatings Network) (For more information, please log in: Global Coatings Network http:// )