The "toxic runway" is not terrible. What is terrible is the mistaken "cognition".

From the "safe milk powder", "gutter oil" and "clenbuterol" incidents in food safety to today's "toxic runway" incidents have aroused widespread concern in society; whether it is food safety or runway safety issues, in the face of these When it comes to "problems," we must not lose our "rationality" and correct "cognition." We cannot say that because milk powder is toxic, we do not buy milk powder, and the baby does not eat milk powder; nor can we say that the presence of cooking oil in cooking oil does not buy oil and stir-fry; not to mention the existence of clenbuterol We do not eat pork, and these ideas seem to be too "extreme". What we need is a correct "cognition" and "coping." The current "toxic runway" is not terrible. What is terrible is that we do not understand "it". What is even more frightening is that we have to make some "excessive" behaviors when we are not clear.

Not all runways are poisonous, and not all runways are plastic runways.

In the toxic runway incident, more people are concerned about the toxic problem of the plastic runway. The glue is poisonous, the diluent is toxic, and the black particles are poisonous. However, we must understand that the qualified plastic runway is not “poisonous”. China's plastic runway has a history of more than 30 years, and it is relatively mature in technology. It is also impossible to suspect that the entire plastic runway industry has problems due to problems with plastic runways in certain schools. This "crime" added to the plastic track is indeed "unacceptable." In addition, all the "runways" are not called "plastic runways," and there is a runway called "rubber tracks." There is a big difference between them. There is a big difference in materials, production, and construction. However, everyone may have already “blunted” the rubber runway with the plastic runway. In any case, there is a “glue” word, which is also considered to be almost “runway”; it is not true, but in this “toxic runway” incident Mainly refers to the problem of plastic runways, not rubber runway problems. Here we mainly look at the difference between material, production, construction, cost, and environmental protection.

Material and production:

Plastic runway: Consisting of polyurethane prepolymer, mixed polyether, waste tire rubber, EPDM rubber particles or PU particles, pigments, additives and fillers.

Rubber track: The factory mixes natural rubber, synthetic rubber, and chemical additives, and then it is molded and then vulcanized.

Cost and environmental aspects:

The cost of the rubber track is much higher than that of the plastic track. In terms of environmental performance, no organic solvents such as toluene and xylene have been added to the rubber track during the production process of the rubber track. Therefore, there is no organic solvent evaporation problem.

Construction: (image comparison)

↑Polyurethane plastic runway construction drawing (spraying method)

↑Rubber runway construction drawing (tiling method)

Smell runway is toxic runway?

As a plastic runway practitioner, I feel that I have the responsibility to guide and understand this problem correctly: odor-free runways and poisonous runways cannot be equated. There is a certain relationship between toxic runways and odorized runways, but it is definitely not possible. The "=" mark; first poisonous runway from a certain chemical characteristics, there are generally "odor", there are individual pungent odors, because some runway material manufacturers add excess diluent (toluene, Xylene, banana water, gasoline, etc.) or some other toxic solvents, but the premise is "excessive", so that the polyurethane plastic track laid out is definitely "toxic and tasteful"; but this does not explain the "smell" runway There must be "poisonous."

Qualified plastic track is non-toxic

China has clear regulations and requirements for toluene and xylene in plastic runways and TDI in glue. It requires the sum of toluene and xylene to be less than or equal to 0.05g/kg, and the concentration of TDI must not exceed 0.2mg/m3. The standard is still a standard for air concentration in the workshop. The workshop environment is relatively closed, and the laying of plastic runways is generally conducted outdoors. The air circulation is good, so the concentration in the outdoor is relatively low. Although TDI is very toxic, its isocyanate group (NCO group) contained in its molecular structure is an extremely reactive group and can easily react with active hydrogen compounds including water vapor in the air. Quickly converted to non-toxic substances. Even if it only reacts with hydroxyl radicals in the air, its half-life is only a few hours to one day. From the point of view of the production and laying process of polyurethane plastic runways, the hazards of TDI are mainly in the production filling workshop of TDI, that is, In the production process of synthetic polyurethane prepolymers, as long as the mechanical sealing and ventilation conditions are strictly controlled, the TDI limited concentration requirements in the workshop air as specified by the national standards can be met.

Qualified plastic runways, more or less also with some "odors", but this is not "toxic."

We all know that the formation of a polyurethane plastic runway is a combination of many chemical materials, and the composition is relatively complex. Even if all the components are produced within the national standard, the plastic runway will have some “taste” because It is first of all a chemical material that itself possesses certain chemical properties (eg, odor, relative density, freezing point, boiling point, refractive index, etc.), and what we can usually sense is "odor," but it is a qualified plastic runway smell. To be “less”, it is easier to evaporate, and it will hardly cause harm to the human body. The toxic odor in the runway is “more” and it is difficult to evaporate, which will inevitably cause harm to the human body.

The "smell" of plastic runways has a lot to do with the time of use

In general, the smell of the new plastic runway is “taste” greater than that of the old plastic runway, and the qualified runway odor will continue to “decrease” over time until the odor disappears.

According to the plastic runway maintenance standards, the new plastic runway can not be used immediately. It takes 7-14 days for maintenance. The maintenance is not only to protect the plastic track itself, but also to make it volatilize some odors, which is good for the health; and we It will often be found that the school can urge the children to use the plastic runway in order to catch up at the beginning of school and continuously urge the construction party to complete the work as quickly as possible. If the work cannot be completed on time, the corresponding default money will be deducted and the construction party will “satisfy” the school’s requirements under great pressure. , Overtime and rushing time, once delivered, it is delivered for use. It does not give the runway a "respite" opportunity. How could the children smell bad?

The "toxic runway" is not terrible. What is terrible is the wrong "cognition".

It is undoubted that there is a problem with poisonous runways. I believe everyone can understand the feelings of every parent. It is that no one is willing to send their children to poisonous runway schools; however, it is just like us. As we said earlier, we need to correctly understand the source of toxic runways, the difference between poisonous runways and smelly runways, instead of “killing dead ones,” and saying that runways cannot be used like some parents smell on the school runways.” Poisonous, need to be dismantled immediately, even if the child may be bitten by a mosquito at home and cause skin irritation. Will it be a question of whether the child is in a school runway? A cough that is caused by a cold can also be considered a school poison runway. If the child "stomach ache", "headache", "dizziness", "leukemia" and so on will drag the responsibility to the "toxicity of the plastic runway", obviously this is incorrect, although parents are concerned that the child is not wrong, But we can't look at a problem one-sidedly; like a person, one day he made a mistake and we said that this person is a bad person. Even the friends around him are considered to be “bad guys,” and it’s really “a fire in the city, which affects the fish!” Such a “label” is clearly “wrong” on him, and it is even more “innocent” on his friends. ".

A few days ago, Jiangsu Province reported on the verification and disposal of plastic runways in some regions and individual schools. From the notification, most of the school’s plastic track test results were qualified and no toxic or hazardous substances were found. It is also normal to display physical examination results. As for some students with nosebleeds in previous years, this may have a lot to do with seasonal changes, rather than having a direct relationship with plastic runways.

A balance between protecting the environment and protecting children

I believe the country’s increased support for the sports industry policy is certainly correct. Allocating schools to “standard” is all for the children! Imagine if we blindly wipe out the runway and the stadium is gone. Is the child safe? Is the child happy? If the runway is made of loess or cement, and the child falls on such a runway, who will bear this responsibility?

A plastic runway where a school was eradicated

In fact, the "toxic runway" incident is a "good thing" for the sports industry, not a "miraculous" thing;

First, it will prompt the country and industry to issue relevant national and industry standards to make up for the lack of current industry standards;

The second is to regulate the industry's bid, production, construction and use management.

The third is to urge the entire industry and even the community to think about and recognize the source of poisoned runways and how to better balance the protection of the environment with the protection of children.

All industries and industries will have more or less "problems" in the process of development. The appearance of these problems is also normal, because only problems will lead to greater thinking and progress; this time in the sports industry The "toxic runway" incident is also normal, because development is a process of discovering problems and resolving problems again and again; we cannot stop the pace of development and discover "poisoned milk powder" before we know what powdered milk is safe; "We only know how to better produce safe and environmentally friendly runways; rather than blindly thinking that the removal of the runway is the root cause of solving the poisonous runway;

If the schools all return to the era where there are no plastic runways, all of which are mud, potholes, or later hard cement runways, will our parents rest assured that their children will fall at school? If they fall, it should be Who will bear the responsibility? Is the school or the parents of the students themselves? Like our homes, the houses that lived in the previous poor times, from huts, earth houses, to today’s “reinforced concrete rooms”, if only from environmental protection From an angle of view, it must be a hut and earth house that is more environmentally friendly than the current reinforced concrete room; while the reinforced concrete room has added some chemical materials containing formaldehyde during the renovation, it will volatilize toxic odors, but we once thought about it once. How did we resist the earthquake, typhoon and heavy rain? From the "thatched cottage - earth room - reinforced concrete room" this is a social progress, the runway from the "dirt runway - cement runway - plastic runway" is also a social The need for progress and development; we cannot say that the cement and concrete room is the best, let alone the plastic runway is the best, perhaps in the process of social progress and development. There is a new "stuff" instead of "existing", and we need to do is in the process of development, both adhere to the "people-oriented" and find a "balance" in the protection of the environment.

The article is an independent view of the author and does not represent the position of the blog

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