When was plastic invented?
Advantage1., most of the plastic corrosion resistance, and not with acid, alkali reaction.2. plastic manufacturing costs low.3. durable, waterproof, light quality.4. easy to Suzhi into different shapes.5. are good insulators.6., plastics can be used in the preparation of fuel oil and fuel gas, which can reduce oil consumption.shortcoming1., the recycling of waste plastics, classification is very difficult, but also uneconomical.2.. Plastics burn easily and produce poisonous gases when they burn. For example, toluene combustion produces a small amount of polystyrene, this substance can cause blindness, vomiting and other symptoms of inhalation, PVC combustion will produce toxic gases, hydrogen chloride in combustion, is a high temperature environment, will lead to plastic decomposition of toxic components, such as benzene etc..3. plastics are made from petroleum refining products, and oil resources are limited.4. plastic buried in the ground for hundreds of years, thousands of years or even tens of thousands of years will not decay.5., the heat resistance of plastic is poor, easy to aging.6. because of the inability of plastics to degrade naturally, it has become the number one enemy of mankind and has led to the tragedy of many animal deaths.
The main component of plastics is resin. The term was first resin secrete by animal and plant lipid and its name, such as rosin, shellac, resin is not mixed with various additives and polymer compounds. Resin accounts for about 40% to 100% of the total weight of plastics. The basic properties of plastics depend mainly on the nature of the resin, but additives also play an important role. Some plastics are made up of synthetic resins, with or without additives such as plexiglass and polystyrene.
The plastic is made of monomers as raw materials, polymer by polyaddition or polycondensation polymerization (macromolecules), commonly known as plastic resin (plastics) or (resin), can freely change the composition and form style, composed of synthetic resin and filler, plasticizer, stabilizer, lubricant, pigment and other additives.
