The hottest engineering plastics replacing metals

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Engineering plastics may become the future trend to replace metals

among all kinds of plastics, some are as hard as stone in radar microwave stealth, some are as tough as steel, and some are as stable as steel and gold. Some people also believe that the quality of products should be reduced by replacing metals with engineering plastics. The fact is that replacing metal with engineering plastics improves the quality of products on many occasions. Next, we will compare engineering plastics with metals, so that we can have a more correct and comprehensive understanding of the properties of engineering plastics

compared with metal, the main advantages of engineering plastics are:

(1) light product quality: the proportion of engineering plastics is generally about 0.83 ~ 2.2, only 1/9 ~ 1/4 of steel and 1/2 of aluminum. Some engineering plastics, such as polypropylene, are much lighter than water. This characteristic of plastics is of great significance for mechanical equipment requiring to reduce self weight, such as vehicles, ships and aircraft

in this way, the load base that can be reached by each load remains unchanged (2) higher specific strength: for materials with equal volume, the strength of engineering plastics is generally lower than that of metals. However, because engineering plastics are much lighter than metals, when compared with equal weight, the strength of some engineering plastics is much higher than that of general metals, which is the strongest material in existing structural materials. For example, 2. The tensile strength per unit weight of glass fiber reinforced epoxy resin with long service life is about 2 times higher than that of ordinary steel

(3) good chemical stability: engineering plastics generally have good corrosion resistance to acid, alkali and other chemicals, which is a very significant advantage. Among them, polytetrafluoroethylene and polyether chloride have very outstanding corrosion resistance, and have a broad development prospect in chemical anti-corrosion equipment

(4) excellent electrical performance: almost all engineering plastics have excellent electrical insulation performance, minimal dielectric loss and excellent arc resistance, which can be compared with ceramic, rubber and other insulating materials. Therefore, the application of engineering plastics in motor, electrical appliance and electronic industry has an extremely broad prospect

(5) excellent friction reduction and wear resistance: using this feature, various self-lubricating bearings can be made of engineering plastics. If there is a need to replace gaskets, gears and sealing rings, etc. Engineering plastics also have good embedment to foreign matters, which is excellent for shock absorption and noise elimination in bad strips with abrasive particles or impurities (6): machinery equipped with engineering plastics bearings and gears can reduce vibration, reduce noise, and even achieve noise elimination. For example, the original 45 carbon steel used for the ball joint seat of the automobile tie rod has a short service life; High noise; After using nylon, not only the service life is prolonged by about one time, but also the noise is greatly reduced

(7) convenient molding and processing: engineering plastic products can often be molded at one time, while metal products can only be processed through several, dozens or even dozens of processes. This characteristic of engineering plastics is of great significance to save man hours and improve labor productivity. Plastic machining is also relatively easy

because engineering plastics have many of the above advantages in physical and mechanical properties, it is more and more widely used in industry. This in turn has promoted the rapid development of the plastic industry

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