How to view the merits and demerits of plastics

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How to treat the "merits and demerits" of plastic products can be seen everywhere in reality, and it has already become an indispensable part of people's life. However, most of us who have long been exposed to plastic know little about it, and even don't understand what plastic is. This is a quite common phenomenon. Now is the era of knowledge economy. The wider the knowledge you learn, the more you can be appreciated by others. Don't go too far. We still need to master the basic common sense about plastic, otherwise we will make a joke on some occasions. Here, I am going to introduce the advantages and disadvantages of plastic from the aspects of its performance and function, so as to provide a feast for the majority of people who are thirsty for knowledge. Of course, before talking about the "right and wrong" of plastics, I think it is necessary to mention what plastics are. According to an authoritative research report, plastic is a synthetic polymer compound (polymer), also known as macromolecules or macromolecules. It is also commonly known as plastics or resin, which can freely change the shape and style. Plastic is a material polymerized by synthesis or condensation reaction with monomer raw materials. It is composed of synthetic resin and additives such as fillers, plasticizers, stabilizers, lubricants, pigments, etc. its main component is synthetic resin. Resin was originally named after lipids secreted by animals and plants, such as rosin and shellac. At present, resin refers to polymers that have not been mixed with various additives. Resin accounts for about 40% - 100% of the total weight of plastic. The basic properties of plastics mainly depend on the nature of resin, but additives also play an important role. Some plastics are basically composed of synthetic resins, with no or little additives, such as plexiglass, polystyrene, etc. The so-called plastic is actually a kind of synthetic resin. Its shape is similar to that of pine resin in natural resin, but it is also synthesized by chemical force, so it is called plastic

there are many other similar generalizations about the naming of plastics. The American Society for testing and materials defines plastic as: plastic is a material with high molecular weight organic matter as the main component. It presents a solid shape when processing is completed, and can be shaped by flow during manufacturing and processing. From this definition, we can further understand that plastic is a polymer organic compound, which can exist in liquid, solid, colloid, solution and other forms, and can be moldable; Different monomer compositions can produce different plastics to meet the needs of the market, so there are many kinds of plastics, and different plastics have different properties, processing methods and uses. Here, we have mastered the most basic situation of plastic. Now let's untie the God of plastic, but because some of them are out of stock, we support the veil and comment on its "right and wrong"

in terms of advantages, there are indeed many "specialties" of plastics. For example, most plastics have strong corrosion resistance and do not react with acids and alkalis, which reflects the environmental protection performance, high safety factor and guaranteed service life of plastic products; The manufacturing cost of plastics is very low. Generally, the price of plastic products is far lower than that of wood products and metal products; Plastic products are durable, waterproof and light, which are the most remarkable characteristics of plastic products. Only because of this special performance, plastic products can sweep the market in a short time and replace metal products in many ways, saving many valuable non renewable resources and bringing more convenience to consumers; Plastic has strong plasticity and is easy to be molded into different shapes. Therefore, there are so many plastic products with various patterns on the market, which can greatly meet many individual needs of consumers; We all basically know that plastic is a good insulator, which is widely used in communication, power supply and other fields, and has played a great role in the development of society. In addition, plastics can also be used to prepare fuel oil and fuel gas, which can effectively reduce crude oil consumption. From these aspects, plastic is indeed "indispensable". However, while plastic is expanding its strength, it inevitably exposes its natural defects

from the perspective of disadvantages, plastics bring us high-performance fibers and composites: high-performance carbon fibers, carbon fiber composite core wires, automotive carbon fiber composites, silicon carbide fiber preforms, high temperature resistant continuous silicon carbide fibers. Europe is still the largest peek trading market in the world, and there are many headaches. For example, there are many ways of "birth" of plastics, and the types of manufactured products are too complex. When recycling waste plastics, it is very difficult to classify them, and it is not cost-effective in economy; Plastic is easy to burn, and ordinary plastic basically produces toxic gases when burning. For example, toluene is produced when polystyrene is burned. A small amount of this substance will lead to blindness. After inhalation, it will cause physical discomfort, vomiting and other symptoms. PVC, one of the plastic types, will also produce toxic gases such as hydrogen chloride when burning. In addition to burning, plastic components such as benzene ring will also decompose into toxic components under high temperature environment. In addition, many plastics are made from petroleum refined products, and petroleum resources are limited. The occupation of non renewable resources by plastics has also become a practical issue that must be solved as soon as possible in the sustainable development of society. In our daily life, we also found that the smoothness of plastic is weak and the adhesion is strong. The appearance of plastic products is mostly very rough and particularly easy to be contaminated with grease. For example, compared with metal and other utensils, plastic utensils are often troublesome in cleaning, and a large number of cleaning aids are needed to complete the cleaning work

everything is divided into two, so we need to look at the problem comprehensively. As for the advantages and disadvantages of plastic, we have made a preliminary summary above. From the scientific view of dividing it into two, we cannot hold it to the "altar" because it has many irreplaceable advantages, exaggerate its advantages too much, or kill it with a stick because it has some natural defects, veto its functions and its role in social construction, What we need to do is to constantly carry forward the advantages of plastic, make up for its defects, and give full play to the greatest function of plastic by learning from each other. This is a rational attitude. At present, plastic products have been popular in the commodity market because of their unique performance and advantages, but we should not be blindly optimistic. We should see that the negative factors of plastic have caused harm to people's health and hindered the long-term development of society to a certain extent. Therefore, it is necessary for us to act in accordance with the national environmental protection and economic regulations and constantly improve the performance of plastic products, Eliminating harmful ingredients in plastic products and leading the plastic manufacturing industry to a sustainable development is the inevitable direction of the plastic industry in the future

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