Tuesday, March 12, 2013
the artificial grass fire caused by polyethylene or polypropylene
The natural grass is not flammable, and the artificial grass fire caused by polyethylene or polypropylene, the molecular chain, only two elements of carbon, hydrogen, at high temperature, fever, discharge easily discharge the limiting oxygen index is only 17.4, there is a big security risk. Can be mitigated to some extent by the addition of flame retardants, but there are also a lot of drawbacks, such as adding accelerator BPP, make the raw materials to increase a pungent odor; Add phenomenon the aliphatic halogen flame retardants will occur precipitation . Currently, the use of flame retardants will lead to a decline in the physical and mechanical properties and electrical properties of the original product.
the friction coefficient of the artificial grass is generally between 0.8 to 1.2, which means that the athletes in this venue to make tackles physical venue intense friction action will rise from 15 to 20 ° C, the temperature of the contact area. Studies have pointed out, the air temperature at 33 ℃, the midday sun directly under the artificial grass temperature will reach 50 ° C game in the artificial grass sports field athletes body will be met with a high temperature of 70 ℃, is likely to burn the skin. Further, as the quartz sand of the artificial grass filler in use for some time, will be brought to the turf surface, its rough surface to cause serious harm to the player's body. Although friction with the natural grass also cause the temperature rise of the contact portions, but the soft texture of lawn grass determines excellent natural turf stadium surface having the appropriate degree of smoothness, the heat generated by friction in the range of the human body can be tolerated, no athlete cause any injury. Outstanding natural lawns with moderate hardness and resilience, the athlete can arbitrarily make a variety of technical movements, do not worry because the fall and be seriously injured.
Domestic use artificial grass buffer layer material is rubber or foam thickness of 5 mm, the flexibility is not ideal. Athletes in high-intensity artificial grass sports arena violent confrontation, ankle, knee by contusions, sprains and other injuries, the probability is greater than natural turf stadium. Artificial grass football field, athletes make difficult moves, because the elastic is not ideal, and can not produce enough buffer time, may make the body suffer major damage in the landing.
Natural lawn by green plants lawn grass, slender stems and leaves, soft texture, will not generate static electricity when the athlete's body, with its friction. Artificial grass, the polymer products due to the resistance of large friction, easy to produce static electricity. Medical Research: the electrostatic contacts will feel a hot flashes, irritability, headache, feeling. This situation will cause the athletes psychological discomfort, affect the technical level of play. In addition, electrostatic changed surface potential difference impede the normal heart electrical conduction, easy to induce premature ventricular contractions and other arrhythmias, at the same time there is a fire safety risks.