Polyvinyl chloride PVC is also a commonly used plastic. It is a resin composed of PVC resin, plasticizer and antioxidant, and it is not toxic in itself. However, the main auxiliary materials such as plasticizers and antioxidants are toxic. The plasticizers used in daily-use PVC plastics mainly include dibutyl terephthalate and dioctyl phthalate. These chemicals are toxic, and so is lead stearate, an antioxidant of PVC. When PVC products containing lead salt antioxidants come into contact with solvents such as ethanol and ether, lead will be precipitated.

When PVC containing lead salt is used as food packaging, lead molecules will diffuse into oil when encountering fried dough sticks, fried cakes, fried fish, cooked meat products and cakes and snacks, so it is not possible to use PVC plastic bags to pack food, especially oily food. In addition, PVC plastic products will slowly decompose hydrogen chloride gas at high temperature, such as about 50℃, which is harmful to human body, so PVC products are not suitable as food packaging materials.

PVC is the main source of dioxins. Dioxin (TCDD) is the most deadly substance in the dioxin family, a well-known carcinogen, hormone decomposer and toxic compound, which is extremely harmful to human beings and animals. When PVC is produced, recycled and destroyed in an incinerator, or when PVC products are accidentally burned, such as landfill, dioxins will be produced.

Extended data:

When purchasing and using electric hot water bottles, you should "touch two, look at three and compare" to prevent electric hot water bottles from becoming "pocket bombs"

First, the touch material: the heating element of the heating wire (tube) hot water bottle does not directly contact the liquid, so that the water and electricity are separated, the whole process is insulated, and the temperature is controllable, which is much safer than the electrode type. Consumers can tell by touching the heater of the hot water bottle. The electric heating wire (tube) heater is larger, with a diameter of 7-8 cm, and the electrode heater is very small, with a diameter of 1-2 cm.

Second, look at the logo: when purchasing electric hot water bottles, consumers should pay attention to check whether there are trademarks, national "3C" certification, product certificate, precautions, manufacturer name and other logos on the packaging of electric hot water bottles.

Third, compare more: consumers should compare more when buying electric hot water bottles. Due to the high manufacturing cost of electric hot water bottles, the ex-factory price is mostly above 30 yuan. If it is lower than this price, consumers should buy it carefully.

Baidu encyclopedia -PVC

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