What isSpecial engineering plastics£¿ ??

Special engineering plastics refer to a type of rubber products with relatively high overall performance and long-term use temperature above 150¡ãC, mainly including polyphenylene ether (PPS), polyacrylonitrile (PI), polyetheretherketone (PEEK), liquid crystal polymer (LCP) and polysulfone (PSF). Special engineering plastics have special and excellent process performance and are widely used in high-tech fields such as electronic appliances and special industrial production.

Special engineering plastics are a new generation of high-performance polymer materials developed worldwide from the 1960s to the early 1980s, driven by the market demand of the Cold War between the United States and Russia. In the early days, they were called heat-resistant polymer materials (relative to rubber products). At present, they are usually called special engineering plastics (Super Engineering Plastics) or high-performance polymers (High Performance Polymer). From the appearance of polyacrylonitrile (PI) in the 1960s to the commercialization of PEEK in the early 1980s, the main types developed and industrialized are:

1. Polyacrylonitrile (PI);

2. Polyamide-imide (PAI);

3. Polyetherimide (PEI);

4. Polyarylate (U-polymer);

5. Polyphenylene ether (PPS);

6. Polysulfone (PSF)

7. Polyethersulfone (PES);

8. Polyetheretherketone (PEEK), etc.

The development history of special engineering plastics

1) Physical performance:

a. High insulation grade (generally defined as UL temperature index above 150¡ãC);

b. High structural mechanical strength (generally 2 to 4 times that of plastic raw materials);

c. Excellent comprehensive performance (such as resistance to radiation sources, high temperature and weather).

d. Extraordinary stability and properties that surpass those of traditional polymers.

2) Production process level:

a. The production and processing temperature is high (usually 300~400¡æ);

b. High injection pressure (generally 120MPa~160MPa is required);

c. The mold must be heated (which is the opposite of cooling the plastic raw material);

d. Hot runner system is preferred.

Use of special engineering plastics

A typical feature of special engineering plastics is that the total output is relatively small and the main uses are unique. This material was originally created to meet the needs of national defense and military industry or human scientific research. At present, the application of special engineering plastics is shifting towards the civilian level.

1. Aerospace Engineering

Because of the unique use environment of the space shuttle, its structural materials are required to have the characteristics of light weight, high toughness, heat resistance and high flame retardancy.PEEKMaterials such as PPS and polyamide-imide have very high thermal expansion temperature and high operating temperature, so they are widely used in the aerospace industry.

2. Electronic information technology field

The use of special engineering plastics in the field of electronic information. Mainly includes:

(1) Electronic components (such as connectors, power sockets, insulating electromagnetic coils and gear shafts, etc.);

(2) Integrated circuit chip (IC) packaging materials and lead-free soldering materials;

(3) Cutting-edge communication components (such as optical waveguide materials, mobile phone components, etc.). Due to the excellent comprehensive performance of special engineering plastics (such as being able to maintain good heat resistance even when very thin), many mobile communication manufacturers have turned their attention to special engineering plastics in the development of new generation mobile communication equipment.

(4) Another important application of special engineering plastics in the microelectronics industry is IC mounting materials.

3. Medical services

In recent years, synthetic polymer materials have been widely used as microbial medical materials (such as artificial organs, urinary catheters, endoscopes, etc.). Because medical polymer materials can adjust the structure of the materials so that the materials have different physical properties (such as resistance to biological aging, as long-term embedded materials, easy to process and disinfect, etc.), they have received widespread attention around the world and become the most widely used and most widely used type of microbial materials. They are easy to process, can withstand continuous cleaning and disinfection, and are resistant to solvents. Therefore, they are gradually applied to the manufacture of medical devices, drug retarding systems, and artificial human bones.

4. Power and energy sector

The use of high-performance battery production is one of the most typical manifestations of the use of special engineering plastics in the energy field. Hydrogen fuel cells are a high-efficiency power generation system that converts mechanical energy into electrical energy through electrochemical corrosion without ignition.

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