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1.PVC production---pollute the environment
Due to the lack of petroleum resources , most producers adopt the calcium carbide method to produce PVC. The mercury catalyst in the calcium carbide method of vinyl chloride production is the main source of mercury pollution and flows to the environment in various ways .
The production of PVC is a high-energy-consuming industry and involves a variety of toxic chemicals, including dichloroethane, vinyl chloride, mercury pollution, etc. Once an explosion or leakage occurs, it will be harmful to the health of the workers in the vinyl chloride plant and the nearby people. The threat is great.
Dichloroethane is a colorless, oily liquid, confirmed by the International Organization for Cancer (IARC) as a category 2B carcinogen. It will be toxic if inhaled, ingested or absorbed by the skin.
Vinyl chloride monomer is the main raw material for the production of PVC. It is a category 3 carcinogen, which can cause liver cancer, and can also cause pathological phenomena such as bending of fingers and spots on the skin.
2. Use of PVC---hazardous to health

In the process of PVC production and processing, it is necessary to add some processing aids, such as fillers, stabilizers, lubricants, plasticizers, colorants and flame retardants. Among them, the use of stabilizers and plasticizers is very high.
Before PVC is made into various finished products, it is necessary to add different contents of plasticizer according to the required softness of the product. Generally speaking, semi-rigid PVC needs to add 10-30% plasticizer, and soft PVC needs to add 30-70% plasticizer.
For example, the average plasticizer content of medical products is 20%-40%. In the case of plastic wrap, drip tubes or drip bags, the plasticizer content can reach more than 70%, which is equivalent to PVC immersed in the plasticizer.
There are many types of PVC plasticizers, but the most common one is a type of chemical substance called phthalate.
"Phthalates and their metabolites and degradation products have negative effects on human health, such as endocrine disrupting effects, the use of boys to be feminized, and girls' precocious puberty."
On the other hand, because PVC is not resistant to light and heat, under the influence of light and heat, chlorine free radicals will be released, resulting in material degradation. In order to improve the thermal stability of PVC, an appropriate amount of stabilizer is often added to prevent or slow down the degradation of PVC during processing.
The pollution caused by stabilizers is mainly heavy metal pollution.
Commonly used stabilizers include metal salts such as lead, cadmium, zinc, barium, tin, etc. These metals will seep out from PVC products, thereby endangering human health.
"The commonly used stabilizer lead can damage children's nervous system and hinder their IQ development; it can damage the female reproductive system and may cause cancer. Cadmium can affect kidney function."
3.Disposal-deadly substance
PVC waste is not easy to handle. Because it often contains plasticizers and heavy metals, if it is mixed into recycled plastics, it will pollute the recycled plastics and turn the circular economy into a poisonous cycle.
At the same time, because PVC contains chlorine, if it is incinerated, it will not only release pungent and toxic hydrogen chloride gas, but also produce a strong carcinogen—dioxin.
PVC waste also has environmental problems in the landfill process. For example, a large amount of untreated PVC may be burnt. When the landfill occasionally catches fire, the PVC waste in the landfill will burn to generate dioxins; Lead-containing stabilizers can leak from containers and jars of several plastic mixtures.
"The disposal of PVC seriously hinders the sound operation of our country's garbage classification and recycling system."