Views: 26 Author: Ms.Daisy Zan Publish Time: 2021-10-25 Origin: Site
Raw materials for plastic recycling
Plastic is an indispensable part of our lives now. It can be understood literally as a material that can be shaped. It is a polymer material whose main component is a synthetic polymer compound, also called synthetic resin, in order to increase For some properties of the product, some additives will be added to change its properties, so what is plastic and how to distinguish various plastic materials.
In terms of molecular structure, plastics are a kind of polymer, which makes plastics very easy to shape. It can be understood literally that they are materials that can be shaped. Especially under high temperature and high pressure, most plastics are extracted from fossil fuels, and oil and natural gas are the main raw materials. They become the perfect materials for plastics.
PP (polypropylene), with small density, transparent and light appearance of raw materials, non-toxic and tasteless, high strength and elasticity, has chemical resistance, collision resistance, high temperature resistance of 100 ~ 120 ℃, and can be heated in the microwave oven, but it is forbidden to use recycled products to contain food. PP is commonly used in plastic lunch boxes, water cups, food packaging boxes and other products. Due to these characteristics of PP, So Australian currency is made of this kind of plastic.
PET (polyester), also known as polyester resin, has milky white or light yellow raw materials, good transparency and non toxicity. It has the characteristics of high density, high hardness, wear resistance, but it is not resistant to hot water invasion and alkali. The service temperature is 65 ℃ ~ - 20 ℃. It is easy to release harmful substances beyond this temperature and cannot be used repeatedly for a long time. It is mainly used in beverage bottles and mineral water bottles in packaging materials, Shell and accessories in electronic and electrical appliances.
HDPE (high density polyethylene), also known as low pressure ethylene, is white, non-toxic and tasteless. It has the characteristics of low density, good toughness, acid and alkali resistance, but poor aging resistance. It is difficult to clean and recycle. It is mainly used for washing bottles, wires and cable sheath.
PVC (polyvinyl chloride), also known as adhesive film, has the characteristics of yellow translucent raw material, good transparency, high strength, good flexibility and not easy to be brittle. PVC can be divided into soft and hard. The difference between them depends on whether a softener is added. PVC itself is not toxic. If plasticizer and antioxidant are added, it will be toxic, so soft PVC is not toxic, and hard PVC is toxic, It is mainly used in pipes, doors and windows in packaging materials and building materials industry.