What exactly is the raw material of plastic?

According to the molecular structure of synthetic resins, plastic raw materials are mainly divided into thermoplastics and thermosetting plastics: for thermoplastics, plastics that are still malleable after repeated heating: mainly PE PP, PVC PS, ABS, PMMA, POM, PC PA and other commonly used raw materials.

Thermosetting plastics mainly refer to plastics made from heat-hardened synthetic resins, such as some phenolic plastics and amino plastics.

The term plastic raw material is in English"plastic"The original meaning is a material or plastic material that can be arbitrarily kneaded into various shapes. And in the sea of words is defined as:"Synthetic or natural polymer compounds are the main ingredients"It can be plasticized and molded under certain conditions, and the product can finally maintain the same shape.

1. The main ingredient of plastic raw materials is the polymer compound matrix known as resin.

2. Plastic raw materials: It is a material that is made of polymer synthetic resin (polymer) as the main ingredient infiltrated into various auxiliary materials or some additives with specific purposes, which has plasticity and fluidity under specific temperature and pressure, and can be molded into a certain shape and keep the shape unchanged under certain conditions.

3. Polymer: refers to the pure material or polymeric material produced by the polymerization process. Both natural resin and synthetic resin are polymer polymers, referred to as polymers.

4. Plastic has good insulation properties for electricity, heat and sound: electrical insulation, arc resistance, heat preservation, sound insulation, sound absorption, vibration absorption, and sound attenuation.

Most of the plastic raw materials are extracted from some oils, and the most familiar part of the PC materials are extracted from petroleum. ABS is extracted from coal, and ABS will be soot-like and non-blistering when burned and extinguished; POM is extracted from natural gas, and when it is burned, it will have a very foul gas smell and white smoke.

Plastic raw materials are expanded by heat, and the thermal expansion coefficient is much larger than that of metal;

b.Generally, the stiffness of plastic raw materials is an order of magnitude lower than that of metal; Characteristics of plastic raw materials.

c.The mechanical properties of plastic raw materials will decrease significantly under long-term heating;

d.Generally, plastic raw materials will be permanently deformed when they are stressed for a long time at room temperature and under stress lower than their yield strength;

e.Plastic raw materials are sensitive to notch damage;

f.The mechanical properties of plastic raw materials are usually much lower than those of metals, but the specific strength and specific modulus of some composite materials are higher than those of metals.

g.Generally, the mechanical properties of enhanced plastic raw materials are anisotropic;

h.Some plastic raw materials can absorb moisture and cause changes in size and performance;

i.Some plastics are combustible;

j.At present, the fatigue data of plastic raw materials is still very small, and it needs to be considered according to the requirements of use.

Plastic raw materials have only been around for more than 100 years, but they have developed very quickly, because of the many outstanding and unique properties of plastic raw materials. There are many varieties of plastic raw materials, and their properties are also different, and here are some commonalities of plastic raw materials.

a.Good stability Generally, plastic raw materials have good anti-corrosion and corrosion resistance in acid, alkali and salt media with low concentration and temperature, and a few plastic raw materials can also resist strong acids and alkalis"Plastic King"PTFE (polytetrafluoroethylene) plastic raw materials can withstand even the strongest corrosion ability"Aqua regia"Plastic products are difficult to degrade naturally in nature, which makes products very popular.

b.Lightweight and beautiful general plastic raw materials are less dense, about half of aluminum, one-fifth of steel, some plastic raw materials, pp plastic raw materials are lighter than water, so the products are naturally very lightweight, in addition, most plastics also have a beautiful and generous appearance, such as bright, transparent, etc., and plastic raw materials are easy to color, can make products have a variety of colorful colors, so that the products are very popular.

c.Good electrical insulation Most plastics have excellent electrical insulation, because there are no freely moving electrons and ions inside the polymer. Therefore, it does not have the ability to conduct electricity, but due to the addition of additives.

The electrical insulation properties of plastic raw materials have undergone some changes; Most of the plastic raw materials have good insulation at low frequency and low voltage, and a few plastic raw materials have good insulation even at high frequency and high voltage, so plastic raw materials are widely used in electronics, electrical, communications, instruments and other fields.

e.Good mechanical properties The mechanical properties of plastic raw materials are worse than those of metal, but plastic is much lighter than metal, so the strength (also known as specific strength) calculated by unit mass is close to or more than that of traditional metal materials, and some plastic raw materials, such as FRP, have much higher specific strength than steel, therefore, many structural components can be made of plastic raw materials.

f.Good barrier performance Plastics have excellent barrier properties to gas and water vapor, so various containers, products and films can be used for plastic products, which can play a good role in waterproofing and moisture-proof.

The main ingredient of plastic raw materials is resin. Plastic raw material is a kind of polymer, also known as polymer or macromolecule, and is also commonly known as plastic or resin. The so-called plastic raw material is actually a type of synthetic resin, and its shape is similar to that of natural resin, but it is synthesized by chemical force, so it is called plastic.

This polymer is made up of a number of smaller, simpler molecules that are combined by covalent bonds. There are many types of polymers, and if they are generally classified by the change in heat, they can be divided into two categories.

What is the function of plastic raw materialsPlastic raw materials are very versatile, and many common daily necessities in life are made of plastic, such as table lamp shades, instrument shells and some children's toys. The main raw materials of plastics are synthetic resins, which are mainly coal tar products and calcium carbide in the early days, and now mainly oil and natural gas products, such as ethylene, propylene, benzene, formaldehyde and urea.

Plastics refer to polymer compounds made from monomers as raw materials and then polymerized by polyaddition or polycondensation reactions.

The main component of plastic is resin. Resins are polymer compounds that have not been mixed with various additives. The term resin was originally named after lipids secreted by animals and plants, such as rosin, shellac, etc.

Resin makes up about 40% 100% of the total weight of plastic. The basic properties of plastics are mainly determined by the nature of the resin, but additives also play an important role. Some plastics are basically composed of synthetic resins with little or no additives, such as plexiglass, polystyrene, etc.

The advantages of plastic are strong corrosion resistance, low manufacturing cost, easy to shape, good insulator, can reduce the consumption of the first grade, etc.; The disadvantages are that it is difficult to use and classify, combustion will produce toxic gases, poor heat resistance, and cannot be naturally degraded.

The current state of plastic bearings

At present, the development of plastic bearings in foreign countries is very fast, and the application range is wider. Plastic bearings are still in their infancy in China, and they are relatively lacking in raw material production and product application.

According to incomplete statistics, in the past five years, the domestic general polycarbonate, polyoxymethylene, polyamide, thermoplastic resin, modified polyphenylene ether and other five major engineering plastics and market demand has maintained a rapid growth, and China's plastic bearing engineering plastics mainly rely on imports.