Engineering plastics English name: engineering-plastics, engineering plastics refers to be used as industrial parts or shell materials of industrial plastics, is the strength, impact resistance, heat resistance, hardness and aging resistance of the plastic are excellent. The Japanese industry defines it as "a high-performance plastic that can be used for construction and mechanical parts, with a heat resistance of more than 100 ℃, mainly used in industry", and its properties include:
1. Thermal properties: glass transfer temperature (Tg) and melting point (Tm); high heat distortion temperature (HDT); long-term operating temperature (UL-746B), high (UL-756B), and high (UL-776B). High (UL-746B); large operating temperature range; small coefficient of thermal expansion.
2. Mechanical properties: high strength, high mechanical modulus, low latent change, strong wear and fatigue resistance.
3. Others: chemical resistance, electrical resistance, flame resistance, weather resistance, good dimensional stability.
As a general engineering plastics, including polycarbonate (PC), polyamide (nylon), polyacetal (POM), modified polyphenylene ether (modified PPE), polyester (PETP, PBTP), polyphenylene sulfide (PPS), polyarylate, thermosetting plastics, unsaturated polyester, phenolic plastics, epoxy plastics and so on. Their basic characteristics are tensile strength of more than 50Mpa, tensile strength of 500kg/cm, impact resistance of more than 50J/m, bending elasticity of 24000kg/cm, load bending temperature of more than 100 ℃, hardness, aging excellent. Polypropylene can also be included in the scope of engineering plastics if its hardness and cold resistance are improved. In addition, it also includes fluorine plastics with weak strength and excellent heat and chemical resistance of the more specialized ones, silicone fusion compounds with excellent heat resistance, and polyamideimide, polyimide, Polybismaleimide, Polysufone (PSF), PES, acrylic plastics, denatured honey amine plastics, BTResin, PEEK, PEI, liquid crystal plastics, and so on.
The chemical structure of each engineering plastic is different, so their drug resistance, friction characteristics, motor characteristics, etc. differ. Due to the different molding properties of each engineering plastic, some are suitable for any molding method, and some can only be processed in a certain molding method, which results in limitations in application. Thermosetting engineering plastics have poor impact resistance, so most of them have glass fibers added. Engineering plastics in addition to polycarbonate and other impact resistance, usually with hard, brittle, small elongation properties, but if you add 20-30% of the glass fiber, it will improve the impact resistance.
Engineering plastics refers to a class of high-performance polymer materials that can be used as structural materials to withstand mechanical stress in a wide range of temperatures and in more demanding chemical and physical environments. : - Generally refers to the ability to withstand a certain degree of external force, and have good mechanical properties and dimensional stability, in high and low temperatures can still maintain its excellent performance, can be used as engineering structural parts of the plastic. Such as ABS, nylon, polyalum and so on.
Can be used as construction and mechanical parts with high-performance plastics, heat resistance in more than 100 ℃, mainly used in industry
Its properties include:
1. Thermal properties: glass transfer temperature (Tg) and melting point (Tm) is high, the heat distortion temperature (HDT) is high, the long term use of the temperature is high (UL-746B), the use of a wide range of temperatures, the coefficient of thermal expansion is small. coefficient of thermal expansion is small.
2. Mechanical properties: high strength, high mechanical modulus, low latent change, wear resistance, fatigue resistance.
3. Others: chemical resistance, excellent electrical resistance, flame resistance, weather resistance, good dimensional stability.
The general-purpose plastics include Polycarbonate (PC), Polyamide (PA), Polyacetal (POM), Poly Phenylene Oxide (PPE), Polyester (PET), and Polyethylene Oxide (PPE). Polyacetal, Polyoxy Methylene, POM, Poly Phenylene Oxide (PPE), Poly Phenylene Oxide (PETP, PBTP), Polyphenylene Sulfide (PPS), Polyarylate, and thermosetting plastics are unsaturated polyester, phenolic, epoxy, etc. The tensile strength is more than 50MPa, and the tensile strength is more than 50MPa. Tensile strength are more than 50MPa, tensile strength of more than 500kg/cm2, impact resistance of more than 50J/m, bending elasticity rate of 24000kg/cm2, the load deflection temperature of more than 100 ℃, its hardness, aging excellent. Polypropylene if you improve the hardness and cold resistance, can also be included in the scope of engineering plastics. In addition, the more special for the strength of the weak, heat-resistant, drug-resistant fluorine plastic, heat-resistant silicone fusion compounds, polyamide imide, polyamide imide, Polybismaleimide, Polysufone (PSF), PES, acrylic plastics, denatured nylon plastics, BT Resin, PEEK, PEI, liquid crystal plastics and so on. Because of the different chemical structures, there are some differences in chemical resistance, friction characteristics, and motor characteristics. And because of the difference in molding, there are those who are suitable for any molding method, and there are those who can only be processed by a certain molding method, resulting in application limitations. Thermosetting engineering plastics, its impact resistance is poor, so most of the glass fiber added. Engineering plastics in addition to polycarbonate and other large impact resistance, usually with a small elongation, hard, brittle nature, but if you add 20 ~ 30% of the glass fiber, it can be improved.
Abrasion-modified engineering plastics
Abrasion-modified engineering plastics can provide a lower coefficient of friction to reduce wear rates. For example, the lid of a glucometer can be made to last longer with the use of abrasion-resistant materials to increase its lifespan as it opens and closes. Abrasion-modified engineering plastics are also used in color-matched products, even between different materials. Single-use products, such as needles and blades, also benefit from the lubricating effect of the material. In addition, other applications for wear-resistant materials include catheters, cannulas, actuators and vacuum tubes. Other effects include reduced noise due to the movement of smooth parts, improved plastics processing and extrusion molding efficiency.
Conductive Modified Engineering Plastics
When thermoplastic materials have a conductive component, they are protected by permanent electrostatic dissipative (ESD) and prevent static buildup. Conductive thermoplastic materials allow for continuous discharge of static electricity rather than rapid buildup and discharge. Static electricity can damage sensitive electronic components and can cause explosions in flammable environments. Static buildup can clog the material's transmission and interrupt the transmission of machinery. Conductive thermoplastics can be used in a wide range of color-matched products, and some conductive materials are transparent. Applications include ECG sensors, suction tubes, electrical protection devices, and new medical delivery devices such as inhalation products, including PMDI spacers.
Radiation Resistant Modified Engineering Plastics
Specific additives can increase the density of thermoplastics. These higher density thermoplastics have the texture of metal but maintain the processing characteristics of plastic. The medical products industry is looking for such alternatives to lead for environmental reasons. These high specific gravity additives are also radiation resistant. Injection molded parts, catheters or sheets made of radiation-resistant compounds attract X-rays without being passed through them. Soft, fabric-like sheets used in radiation therapy or surgery can help protect machines and people from scattered and direct X-rays. Catheters containing barium sulfate can be tracked by fluoroscopy or X-ray imaging after they are implanted in the body.Instruments used by Baxter Healthcare in performing heart valve repair procedures (reusable handles and disposable snap closures) are constructed of polycarbonate specialty-modified engineering plastics.X-ray-visible (i.e., radiation-protected) stoppers are molded using an embedded injection process on a The plugs that are X-ray visible (i.e., have radiation protection) are molded into the template using an embedded injection molding process, while the plugs that are resistant to steam treatment are made of polyethersulfone, which ensures that the entire device can withstand high-temperature steam sterilization treatment.
Pre-Colored Modified Engineering Plastics
Plastic color matching technology has evolved rapidly in recent years. In medical applications, designers can choose from FDA-compliant and non-migrating pigments. Unique color effects can contribute to a product's unique selling point and provide benefits to medical device designers. As medical products move from the hospital to the home consumer market, lovely colors and fluorescent effects can add value to the product. In addition, the use of elastomers can add value by providing a soft touch. Medical devices with pleasant colors can also make patients more willing to cooperate with treatment while reducing their pain.