Plasticizers can enhance the flexibility of plastics, make them easier to process and shape, and are widely used in industry. Every plastic has a heat resistance limit. Among the food materials, the most heat-resistant is polypropylene (PP), which can withstand 140℃, followed by polyethylene (PE), which can withstand 1 10℃, and polystyrene (PS), which can only withstand 90℃.
At present, plastic lunch boxes used in microwave ovens are mainly made of PP or PE. If the temperature exceeds their heat resistance limit, plasticizers may be released. Therefore, it is necessary to avoid heating food with plastic lunch boxes at high temperature for a long time.
Plasticizers can interfere with human endocrine system and have an impact on human body, especially male reproductive system. Animal experiments show that long-term intake of plasticizer may damage liver and kidney, and affect development and growth.
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Harm of plastic rice
Plastic lunch boxes are made of polystyrene. Because of the characteristics of the material itself, there are still many places to pay attention to when using after lifting the ban. Polystyrene is flammable, and the preservation of disposable foamed plastic tableware should consider fire prevention, and it should be clearly stated in the packaging instructions of the products. In addition, polystyrene has poor heat resistance, and will deform when it exceeds 70℃, releasing harmful low molecular substances.
We should know that plastic lunch boxes are not absolutely safe, especially when oily food is contained or heated by microwave oven, unpolymerized styrene monomer will enter the human body with food, leading to human poisoning. Styrene monomer is insoluble in water but soluble in alcohol solution and ether solution. When the concentration is high, it can cause headache, dizziness, nausea, vomiting, general fatigue and other symptoms, and in severe cases, it can suffocate and die. . ?
People's Health Network-Can plastic lunch boxes be heated? Long-term use or harmful to the kidneys