Views:26 Author:Site Editor Publish Time: 2019-04-14 Origin:Site
Both polypropylene and PVC are the most commonly used plastics in our daily life or pipeline construction. They share some common characteristics, but there are some significant differences. First, both polyethylene and polyvinyl chloride are plastics formed by free radical polymerization. Their materials can be classified as plastic films and are water-repellent, but they also have different chemical properties and applications.
This passage mainly compares polypropylene and PVC from three points:
In terms of structure, PVC is formed by a long chain of carbon atoms to which a chlorine atom is attached. However, PE is a large chain of carbon atoms with only hydrogen atoms attached to it. Polypropylene is one of the most environmentally friendly plastics because it is one of the most neutral plastics and produces only carbon dioxide and water when burned.
PVC, which contains chlorine, occupies approximately 30% of the total weight and is usually made of lead stabilizers and plasticizers. Therefore, in landfills, plasticizers from waste PVC can ooze into soil and aquifers, which is not conducive to environmental protection and is prone to pollution. If burned, PVC produces toxic by-products such as dioxins, chlorocarbons and hydrochloric acid. Therefore, PVC products are more toxic than polypropylene, both during their lifetime and during processing.
In addition to negative impact on the environment, PVC also poses a certain threat to people's physical health. Since a large amount of plasticizer must be added during the manufacture of PVC, which concentration is 30%-50%, thereby increasing the flexibility of the PVC product.
Because plasticizers are mobile in nature, and the carcinogens may have will continue to spread, affecting the body's endocrine, and ultimately leading to biological imbalances between humans and other species. PP is more resistant to heat, and even under extreme conditions it only breaks down into lower molecular weight paraffins.
Polypropylene is more environmentally friendly than PVC because polypropylene is made up of non-hazardous materials and can be 100% recycled. However, PVC is not recyclable, mainly because of its inherent chemical composition and the plasticizer it contains. In summary, there is clear evidence that PP is a safer, non-toxic, environmentally friendly alternative to PVC.
However, the chlorine atoms contained in PVC are not all harmful to our lives, which is mainly reflected in their fire resistance. During the combustion process, the release of chlorine atoms inhibits the combustion of the flame. Therefore, it is usually used for the safety of substances such as water pipes, doors and windows that require fire prevention measures.
They also differ in everyday applications, such as polypropylene as a smooth, flexible, tear-resistant paper. You can print the ideal graphics on top of it, in addition to the polypropylene's resistance to creases, and its water resistance makes it unnecessary to laminate for short-term outdoor use to prevent weather. PVC is a flexible material that can be used to make outdoor durable signs that hang well when suspended and can be rolled up for storage or transport.
Since PE has no plasticizer, it is safe for food packaging. Because of this, most commercial kitchens use PVC film instead of PE. PE is most commonly used in gas pipelines because it is softer, more malleable and flexible than PVC. The joints used in PE make it stronger than before and minimize leakage.
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