What harm does the plastic runway do to human body? The track is a familiar place, especially for students, who have to exercise every day at school. Recently, many parents have reported that their children have concentrated on bad symptoms after school. They suspect that it has something to do with the choking smell of the school plastic runway. The following is what harm the plastic track will do to the human body. I hope it will help you!

What harm will the plastic track do to human body? 1 The main component of the plastic track is polyurethane. Professor Luo, a polyurethane expert in the Department of Chemistry and Materials Science, School of Science, Nanjing Forestry University, said that in China, the plastic runway has a history of more than 30 years, and the technology is mature and safe to use, which is worth popularizing. However, some unscrupulous manufacturers use toxic materials to pursue profits. Professor Luo told reporters that the easiest way to identify whether there is a problem with the runway is that if the newly-built plastic runway still has obvious odor after one week, it means there is a problem. According to Professor Luo, the current toxic pollution sources of inferior plastics mainly come from three parts:

First, the solvent used in the plastic track will volatilize toxic toluene and xylene, which has a pungent smell and can cause itchy skin and dizziness. But usually the runway evaporates within a week of completion.

Secondly, inferior plastic track contains a heavy metal drier-lead salt, which can promote the curing and setting of the track, but heavy metal lead will cause permanent pollution. After children's skin is exposed to this plastic runway for a long time, lead will penetrate into the body, leading to excessive blood lead, which is lead poisoning. Catalysts for environmental-friendly plastic racetracks, such as bismuth salts, have poor catalytic effect and are expensive compared with lead salts. But the biggest problem of lead salt is toxicity, which is persistent to water and soil environment and harmful to human body.

The third and most harmful is the toxic plasticizer used in runways, which can increase the elasticity of inferior runways and make them meet the national standards. The most common plasticizer is phthalate plasticizer, and excessive use may even lead to sterilization of boys.

Professor Luo said: "This product is banned in foreign children's products because it has a long-term impact on people and is an estrogen. After too much exposure, boys can't have children. They are dead sperm. This is conclusive abroad. " In addition, Professor Luo also said that there are probably other toxic substances in the inferior runway that have not been found.

What harm does the plastic runway do to human body? 2 How to reduce the harm of plastic runway?

To reduce the harm of plastic runway, we should start with two main toxic substances.

One is to reduce the toxic impurities such as aldehydes in polyether polyols, so that the toxic substances in polyurethane will be reduced eventually.

Second, reduce the harm of diisocyanate. This can be done in two ways. On the one hand, when preparing polyurethane, the polymerization should be completed as much as possible, so as to reduce the residue of diisocyanate as much as possible. On the other hand, when preparing polyurethane, diphenylmethane diisocyanate (MDI) is selected.

This is because there are many kinds of diisocyanate compounds. There are mainly two kinds of diisocyanate for preparing polyurethane, one is toluene diisocyanate (TDI) and the other is diphenylmethane diisocyanate (MDI).

However, TDI is one of the most toxic and volatile diisocyanate compounds, while MDI is more stable and less volatile than TDI, and less toxic and harmful in respiratory inhalation and skin absorption, so MDI is more suitable as a raw material for preparing polyurethane.

However, MDI is more difficult to prepare and the cost is higher than TDI, so some contractors use TDI to prepare plastic runways in order to save costs, which increases the possibility of toxic plastic runways.