Thermoplastic plastic refer to a type of plastic that can be produced repeatedly and has thermoplastic properties. Since plastic is a material with high molecular weight organic substances as its main component, it presents a solid shape when processed. During the manufacturing and processing process, it can be shaped by flow.

Basic Introduction

The structure of thermoplastic plastic is a linear structure. Polymers with this structure are called linear polymer compounds; or some polymers have side chains, called branched polymers, which also belong to linear structures. Linear structure (including branched structure) polymers have the characteristics of elasticity and plasticity due to the existence of independent molecules. They can be dissolved in solvents, melted by heating, and have low hardness and brittleness. Therefore, people classify the thermoplastic properties of this type of plastic into a type of plastic called thermoplastic plastic.

Thermoplastic Thermoplastic have excellent electrical insulation properties, especially polytetrafluoroethylene (PTFE), polystyrene (PS), polyethylene (PE), and polypropylene (PP) have extremely low dielectric constants and dielectric losses, and are suitable for high-frequency and high-voltage insulation materials. Thermoplastic are easy to form and process, but have low heat resistance and are prone to creep. The degree of creep varies with the load, ambient temperature, solvent, and humidity. In order to overcome these weaknesses of thermoplastic and meet the needs of applications in space technology, new energy development, and other fields, countries are developing heat-resistant resins that can be melt-formed, such as polyetheretherketone (PEEK), polyethersulfone (PES), polyarylsulfone (PASU), polyphenylene sulfide (PPS), etc. Composite materials with them as matrix resins have high mechanical properties and chemical corrosion resistance, can be hot-formed and welded, and have better interlaminar shear strength than epoxy resins. For example, polyetheretherketone is used as a matrix resin to make a composite material with carbon fiber, and its fatigue resistance exceeds that of epoxy/carbon fiber. It has good impact resistance, good creep resistance at room temperature, good processability, and can be used continuously at 240-270¡æ. It is an ideal high-temperature resistant insulating material. The composite material made of polyethersulfone as the matrix resin and carbon fiber has high strength and hardness at 200¡æ, and can still maintain good impact resistance at -100¡æ; it is non-toxic, non-flammable, has minimal smoke, and has good radiation resistance. It is expected to be used as a key component of spacecraft, and can also be molded into radar antenna covers, etc.

For example, glass fiber reinforced thermoplastic plastic are a rising star in the reinforced plastic industry. Industrially developed countries put it into industrial production in the late 1950s, China began to develop it in the late 1960s, and gradually put it into industrial production in the mid-1970s, lagging behind the overall production technology level of industrially developed countries by 20 years. Glass fiber reinforced thermoplastic plastic are a new type of lightweight and high-strength engineering structural material. Because it is formed in a hot melt state and then cooled and shaped, its scraps and scrapped products can be reused and reprocessed, which will not cause industrial pollution. It is an environmentally friendly green material. The material has good tensile, bending, compression, elastic modulus and creep resistance, and has good processing performance. It can be processed by injection, extrusion, pressing, lamination and other molding methods, with a short molding cycle and high production efficiency. Adding glass fiber to thermoplastic for reinforcement can increase its mechanical strength by 1 to 2 times, fatigue resistance by 1 to 2 times, creep resistance by 1 to 4 times, heat deformation temperature by 10¡æ to 20¡æ, impact resistance of brittle engineering materials by 1 to 3 times, and linear expansion can be reduced to 1/2 to 1/4 of the original. Due to the above excellent properties of this material, its application field is constantly expanding. At present, it has been widely used in industrial sectors such as automobiles, machinery, electrical appliances, ships, construction, aviation, aerospace and high-tech fields. Because this material has obvious advantages over other engineering materials in terms of light weight, no rust, low overall structural molding cost, and high degree of freedom in design, its application in the automotive industry is increasing day by day, and the growth rate is very fast. According to relevant experts, during the 15th Five-Year Plan period, with the development of China's national economy, the success of Beijing's Olympic bid and China's accession to the WTO, foreign manufacturers will come to China to invest and build factories, which will greatly promote the development of China's glass fiber reinforced engineering plastic.

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