Definition of plastic

1.Plastic is an artificial polymer organic compound (resin) with plasticity.

2.Plastic is an artificial polymer organic compound (resin) with plasticity.

Plastic refers to a man-made material composed of organic synthetic resin as the main component, with or without other matching materials (auxiliary agents). It is usually plasticized into a device with a certain shape under heating and pressure conditions.

3. The so-called plasticity refers to the nature of clay, which deforms after applying a force, but does not return to its original shape after removing the external force. The so-called elasticity (elasticity) means that it deforms when a certain degree of force is applied, but when the applied force is removed, it recovers. In its original form, this property is called elasticity (for example: rubber), and an elastic object is called an elastomer (for example: elastic band); plastic is processed into various shapes by using the plasticity produced by this heating.

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Source of plastic

     Plastics are high molecular weight organic compounds (polymers) made by polymerizing low-molecular organic compounds (such as ethylene, propylene, styrene, vinyl chloride, vinyl alcohol, etc.) under certain conditions. The molecules that make up plastics have molecular weights. Polymers above 10,000, so plastics are polymer compounds (polymers). Generally, plastic molecules contain carbon (C) atoms and hydrogen (H) atoms, and some plastic molecular structures contain a small amount of oxygen (O). , Sulfur (S) atoms. The basic raw materials of plastics are low-molecular carbon and hydrogen compounds, which are artificial resins extracted and synthesized from petroleum, natural gas or coal pyrolysis.

The development process of plastics

Development and production time of different plastics:

1920-1933: Polystyrene (PS), polyvinyl chloride (PVC), polyethylene (PE), ethylene-vinyl acetate copolymer (EVA), polypropylene (PP)

1935: Acrylonitrile-butadiene-styrene copolymer (ABS)

1939: Polyvinyl Terephthalate Copolymer (ABS)

1949: Polyamide (Nylon)

1950: Polymethyl methacrylate (Acrylic)

1956: Polyoxymethylene (POM)

1958: Polycarbonate (PC)

1964: Polyoxymethylene (PPO)

1965: Polysulfone (PSF)

1975: Polybutylene terephthalate (PBT)

1985: Liquid Crystal Plastic (LCP)

1994: Modified to injection molding grade PET (PETG)

1995: Super elastic polyoxymethylene (TPOM)

1996: Transparent rigid polyvinyl chloride

Since 1960, the application and processing technology of plastics has been developed by leaps and bounds.

Classification of plastics

1. Classified according to the application fields of plastics

Generally divided into general plastics and engineering plastics:

¡ôGeneral-purpose plastics can only be used as general non-structural materials, with large output, relatively low price, and general performance. They are mostly used to make daily necessities. (such as: PE, PP, PVC, PS, PMMA, EVA, etc.)

¡ôEngineering plastics refer to high mechanical properties, high temperature resistance, and corrosion resistance. They can be used as structural materials and have excellent comprehensive properties (including: mechanical properties, electrical properties, heat resistance, chemical resistance, etc.). It can maintain this performance well in a wide temperature range and a long time, and can be used for a long time in mechanical stress and harsh chemical and physical environments. The recognized seven engineering plastics are: ABS, PC, POM, PA, PET, PBT, PPO, etc., the output of engineering plastics is relatively small and the price is more expensive. In addition, there are functional plastics (such as: LCP, artificial organs, etc.), nanoplastics, degradable plastics, etc.

2. Classified according to the crystalline form of plastics

2. Classified according to the crystalline form of plastics

Generally divided into crystalline plastics and amorphous plastics

Crystalline plastics refer to plastics whose molecules can produce a certain geometric structure under appropriate conditions (such as: PE, PP, PA, POM, PET, PBT, etc.), most of which are partially crystalline. Amorphous plastics refer to Plastics whose molecular shape and molecular arrangement are not in a crystalline structure and are in a disordered state (such as: ABS, MBS, PC, PVC, PS, PMMA, EVA, AS, etc.), the mechanics of amorphous plastics in all directions The characteristics are the same (isotropic).

3. Classified according to the basic behavior that it exhibits when it is heated

Generally divided into thermoplastics and thermosetting plastics

Thermoplastics refer to plastics (such as: ABS, PP, POM, PC, PS, PVC, PA, PMMA, etc.) that can be repeatedly heated and cooled within a specific temperature range, and it can be recycled. It refers to plastics that become infusible after being heated, and are no longer plastic and can not be recycled when heated again (such as: phenolic resin, epoxy resin, amino resin, polyurethane, expanded polystyrene, etc.).

4. According to the light transmittance of plastics

Generally divided into transparent plastic, translucent plastic and opaque plastic.

Plastics with light transmittance above 88% are called transparent plastics (such as PMMA, PS, PC, Z-polyester, etc.). Commonly used translucent plastics include: PP, PVC, PE, AS, PET, MBS, PSF, etc. , Opaque plastics mainly include POM, PA, ABS, HIPS, PPO, etc.

5. Classification according to the hardness of plastics

Generally divided into rigid plastics, semi-rigid plastics, and soft plastics

¡ôCommon hard plastics are: ABS, POM, PS, PMMA, PC, PET, PBT, PPO, etc.;

¡ôSemi-rigid plastics include: PP, PE, PA, PVC, etc.;

Soft plastics include: soft PVC, K glue (BS), TPE, TPR, EVA, TPU, etc.

6. According to the chemical structure of plastics

A. Polyolefins (such as: LDPE, MDPE, HDPE, LLDPE, UHMWPE, PP, etc.)

B. Polystyrene (such as: PS, AS, BS, ABS, MBS, HIPS, etc.)

C. Polyamides (such as: PA6, PA66, PA610, PA1010, etc.)

D. Polyethers (such as: PC, POM, PSF, PPO, etc.)

E. Polyester (such as: PBT, PET, etc.)

F. Acrylic esters (such as: PMMA)

Guangzhou Aote Engineering Plastics Co., Ltd., our company specializes in high-performance plastics and engineering plastics injection molding, PEEK injection molding, PEEK plastic parts, PFA injection molding, PPS injection molding, PVDF injection molding, PSU injection molding and injection mold processing.