This kind of injury can't be measured by how much. It hurts students not only physically, but also psychologically. It also indirectly hurts students' study. It should be strictly supervised and accepted, and criminals should not be given an opportunity.
The new runway smells a little bad when it is just put into use. Before it is put into use, there will be testing institutions to test it. If it can be put into use, it means it is qualified, and it is normal to have a little odor.
If the smell is very strong, questions can be asked from a distance of several meters, and it has been put into use for more than a month, indicating that there is something wrong with this runway. You can directly ask questions from the construction party, and you can complain if you can't give reasonable reasons and proof materials.
Where did the poison from the runway come from?
The production materials of plastic track are divided into polyurethane, prefabricated rubber coil and water-based plastic. Among them, polyurethane is the traditional material with the highest market share, and it is also the protagonist of the toxic plastic runway that has been repeatedly exposed.
Polyurethane, the main component of plastic racetrack, is formed by addition polymerization of isocyanate and polyhydroxy compounds, in which isocyanate is a highly toxic monomer. Although it is non-toxic after polymerization, there will be monomer residue. When the residue content is high, isocyanate will cause certain irritation to the skin and damage the respiratory tract.
1, raw materials.
Waterproof primer, glue, black rubber particles and surface particles. Most of the inferior rubber particles are broken by scrap wire skin and waste tires. Because it is broken, it is irregular and dusty. Small enterprises without qualifications, technology, professional production personnel and technicians only have inferior quality and low price. Even toluene, xylene, acetone and inferior diluents, catalysts and solvents containing excessive heavy metals were added to the plastic raw materials. What's more, some manufacturers use aromatic chemicals to cover up the toxic smell through chemical masking, which makes these raw materials even more terrible.
2, the construction technology is not standardized and illegal use of additives.
The construction of plastic runway is similar to a chemical reaction process. Generally, xylene is needed as diluent and lead salt as drier, which requires high professional quality and should be prepared according to the site conditions. Diluent and drier are both toxic to human body.
In the case of unqualified raw materials, it is no problem to add illegal additives to broken glass for a short time. For example, the runway elasticity is not up to standard, and the manufacturer's solution is to add plasticizer, such as chlorinated paraffin, which will decompose and migrate at high temperature, giving off a pungent smell, which is harmful to human body.
Water-based EAU environmental protection runway, turning oil into water is the biggest technological breakthrough.
Environmentally friendly acrylic (environmentally friendly acrylic technology)
Environmental protection (e):
The all-water system developed with the eternal concept of being friendly to the ecological environment has no irritating smell, no harmful substance discharge, very low VOC, and the whole process of production, transportation, storage, construction and use is safe and environmentally friendly.
Acrylic resin (a):
The basic adhesive system is mainly composed of interpenetrating network composite waterborne pure acrylic resin, which inherits its technical characteristics of high environmental protection, high weather resistance and high color retention, and meets the requirements of sports venues such as stadiums and runways for physical properties.
Unification:
Various non-toxic and harmless functional additives, elastic particles and powder that meet the requirements of environmental protection, and basic adhesive are combined into a whole to meet the requirements of construction performance in the fresh mixed state and sports performance and durability after curing.
It is believed that after the introduction of the new national standard 20 18, the poisonous runway will no longer appear.
The new national standard stipulates the limit of 18 kinds of harmful substances that may be produced in the construction of campus plastic runway, and limits the volatile organic compounds of the completed runway according to the home improvement standard. For example, in the Limits and Odor Requirements for Cast-in-place and Precast Paving Products, the release amount of harmful substances shall not be higher than 5mg/m3, formaldehyde 0.4mg/m3, carbon disulfide 7mg/m3, benzene 0. 1mg/m3, and the odor grade is 3.