What is plastic for, what is plastic?

What are plastic bottles used for?

Plastics have the benefits of being lightweight, chemically stable, low manufacturing costs, low thermal conductivity of insulators, and easy molding.

1. Light material: Compared with other materials, plastic is lighter in weight and less dense than water, and is often used to make some easy-to-carry daily necessities.

2. Chemical stability: most plastics have good corrosion resistance to acids, alkalis and other chemicals, and are ideal corrosion-resistant materials.

3. Low manufacturing cost: many plastic products in life can be reused, and synthetic monomers such as propylene and ethylene are easier to obtain, so the synthesis cost is relatively low.

4. Low thermal conductivity of insulators: commonly used to make electrical shells such as sockets, air conditioners, wires, and televisions.

5. Easy to shape: plastic is a natural polymer, which can be kneaded into various shapes.

Plastics: Plastics are polymer compounds made of monomers as raw materials through polyaddition or polycondensation reaction, with medium deformation resistance, between fibers and rubber, and are composed of synthetic resins and additives such as fillers, plasticizers, stabilizers, lubricants, and pigments. It can be arbitrarily kneaded into various shapes and can finally keep the shape unchanged material or plastic material products, the main component is resin.

Plastic is a kind of synthetic resin with high molecular weight as the main component, under certain conditions (temperature, pressure), molded into a certain shape, when the external force is removed, at room temperature, can still maintain the shape of the material.

Generally speaking, some plastics are a single synthetic resin, which can be processed and produced without adding any additives, such as polystyrene plastics, polypropylene plastics, etc. However, there are also some plastics, in addition to synthetic resins, other auxiliary materials (plasticizers, stabilizers, lubricants, fillers, pigments, etc.) need to be added in order to be processed and produced, such as polyvinyl chloride, phenolic plastics, etc.

So, what is a synthetic resin?

As we know, there are natural resins and synthetic resins, which are different. Natural resin refers to an amorphous organic substance secreted from plants or animals in nature. Such as rosin, amber, shellac, peach gum, and latex on rubber trees.

Although these natural resins have been used in daily life for a long time, they are often limited by yield and quality, and cannot meet the needs of modern production. This prompts people to use coal, oil, natural gas, calcium carbide and some agricultural and sideline products as raw materials, and through chemical methods, synthesize some synthetic resins with superior properties than natural resins. This kind of artificial synthetic resin is not only rich in raw materials and can be produced in large quantities, but also can change and improve its performance according to the needs of people to produce various plastic products, and can meet the needs of producing plastic products in terms of quantity and quality.

As a result, synthetic resins have become the main raw materials for the production of plastics.

Plastic, literally, is a material that can be molded, that is, a material that is malleable. Today's plastics are a term for a class of materials that are cast, extruded, blow molded, or injected into a model by casting resin at a certain temperature and pressure.

Plastic refers to a plastic (flexible) material with high molecular weight synthetic resin as the main component, adding appropriate additives, such as plasticizers, stabilizers, antioxidants, flame retardants, colorants, etc., or rigid materials formed by curing and cross-linking.

General plastics refer to this kind of products with wide use, rich material sources, low cost, the largest amount of application, and easy molding, which can be made into plastic products of various shapes. General plastics include polyethylene, polypropylene, polyvinyl chloride, polystyrene, ABS and acrylonitrile styrene copolymers, phenolic resins (PF), amino resins (UF), etc.

The so-called plastic is a polymer compound with a molecular weight of more than 10,000. That's the synthetic resin we've only harvested. But synthetic fibers rubber. There are also some crosslinkers, which are not included in it.

Plastics are polymers, and their main components are synthetic resins. In addition, there are additives that can be added as needed for specific purposes, such as plasticizers that can improve plasticity, antioxidants that prevent plastic aging, etc.

Although the relative molecular mass of polymers is very large, the composition is not complex, and the structure also has certain rules. They are made by the polymerization of small molecules, such as polyethylene plastics, which are made by polymerization of ethylene molecules.

Industry development. After a long period of struggle and opening up to the world, China's plastics industry has formed a relatively complete industrial system, and has become a basic material industry with steel, cement, wood, as a new type of material, its use field has far surpassed the above three materials into the 21st century, China's plastics industry has made remarkable achievements, achieved a historic leap.

As one of the pillar industries of the light industry, the plastics industry has maintained a growth rate of more than 10% in recent years.

The total output value of enterprises above designated size in the plastic products industry ranks third among the 19 major industries of light industry, and the product sales rate is higher than the average level of light industry. From the perspective of the production of synthetic resins, plastic machinery and plastic products, they all show the strong development momentum of China's plastics industry.

Advantages of plastic:

1. Most plastics have strong corrosion resistance and do not react with acids and alkalis.

2. The manufacturing cost of plastic is low.

3. Durable, waterproof and lightweight.

4. It is easy to be molded into different shapes.

5. It is a good insulator.

6. Plastics can be used to prepare fuel oil and fuel gas, which can reduce consumption.