What is the introduction of special engineering plastics? Xiaobian takes you to read

Special engineering plastics

Introduction: Special engineering plastics, also called high-performance engineering plastics, refer to engineering plastics with higher comprehensive performance and long-term utilization temperature above 150 °C. They are mainly used in high-tech, military and aerospace, aviation and other properties.

Special engineering plastics include polyphenylene sulfide (PPS), polysulfone (PSF), polyimide (PI), polyarylate (PaR), liquid crystal polymer (LCP), polyetheretherketone (PEEK), including Fluoropolymers, etc., there are many types of special engineering plastics, and the performance is excellent.

Polyphenylene sulfide (PPS)

Polyphenylene sulfide is a polyphenylene sulfide, which is a thermoplastic resin with a phenylthio group in the main chain of the molecule. The English name is polyphenylene snlfide (PPS).

PPS is a highly rigid white powder polymer of crystalline form (crystallinity 55%-65%), high heat resistance (continuous use temperature up to 240 ° C), machine strength, rigidity, flame retardancy, chemical resistance, electrical properties Resin with excellent dimensional stability, excellent wear resistance, creep resistance and excellent flame retardancy. Self-extinguishing. Up to UL94V-0, it retains excellent electrical properties under high temperature and high humidity. It has good activity and is easy to form. There is no shrinkage and dent in the molding. Excellent affinity with various inorganic fillers. After strengthening the modification, the physical machine performance and heat resistance (heat distortion temperature) can be improved, and the reinforcing materials include glass fiber, carbon fiber, aramid fiber, metal fiber, etc., mainly composed of glass fiber. The inorganic fillers are talc, kaolin, calcium carbonate, silica, molybdenum disulfide, and the like.

Alloys such as PPS/PTFE, PPS/Pa, and PPS/PPO have been commercialized. PPS/PTFE alloys have reformed the brittleness, lubricity and corrosion resistance of PPS, and PPS/Pa alloys are high toughness alloys.

Glass fiber reinforced PPS has excellent thermal stability, wear resistance, creep resistance, excellent machine performance and electrical properties in a wide range (temperature, humidity, frequency), small dielectric charge, dielectric loss low. As a high temperature resistant, anticorrosive coating, the coating can be used for a long time at 180 °C; the electrical and electronic property is used as a connector, as a separator, terminal, switch; the machine and the glue machine are used as pumps, gears, piston ring storage tanks, Blade valve parts, clock parts, camera parts; car property on the vaporizer. Dispatcher parts, electronic and electrical components, batch valve gas, sensor parts; home appliance parts have tape recorder layout parts, body diodes, various parts; the other is also used for aerospace, aviation property, PPS / PTFE Make anti-adhesive, wear-resistant parts and transmission parts, such as shaft pumps.

Polysulfone resins are a class of thermoplastic engineering plastics that appeared after the mid-1960s. They are a class of non-crystalline thermoplastic engineering plastics containing sulfone oximes and aromatic nucleuses in the main chain.

According to its chemical layout, it can be divided into aliphatic polysulfone and aromatic polysulfone. Aliphatic polysulfone is not alkali resistant, heat resistant, and has no practical cost, while bisphenol a polysulfone in aromatic polysulfone and its modified product - polyarylsulfone of non-bisphenol a, and polyethersulfone, It has a wide range of uses and is a high molecular weight polysulfone resin that has been commercially produced.

Bisphenol a polysulfone resin was awarded by U.S. Carbon Company (UCC) in 1965 under the trade name Udel polysuifone;

Polyaryl sulfone was opened in 1967 by American 3M Company under the trade name astrel;

Polyethersulfone was opened in 1972 by the British company ICI (ICI) under the trade name Victrex.

The oxygen in the polysulfone resin layout has a highly resonant diaryl sulfone group, the sulfur atom is in a fully oxidized state, and the high resonance of the sulfone group makes the polysulfone resin extremely excellent in oxidation resistance and heat resistance, and has excellent performance. Melt stability, these are the processing properties that must be possessed by high temperature molding and extrusion.

Polysulfone

Introduction: Polysulfone is a thermoplastic resin containing a chain link in the main chain of the molecule. The English name Polysalfone (referred to as PSF or PSU) has ordinary bisphenol a type PSF (known as PSF), polyaryl sulfone and polyether sulfone II. Kind.

PSF is a slightly amber amorphous transparent or translucent polymer with excellent mechanical properties, high rigidity, wear resistance and high strength. Even in high temperature, it retains its excellent machine performance. Its scope is - 100~150°C, long-term utilization temperature is 160°C, short-term utilization temperature is 190°C, high thermal stability, hydrolysis resistance, good dimensional stability, small forming shrinkage, non-toxic, radiation-resistant, flame-resistant and extinguishable. Excellent electrical performance in a wide range of temperatures and frequencies. Good chemical stability, in addition to concentrated nitric acid, concentrated sulfuric acid, halogenated hydrocarbons, can withstand ordinary acids, alkalis, salts, swelling in ketones, esters. UV and weather resistance are poor. Poor fatigue resistance is an important drawback. PSF should be pre-dried to a moisture content of less than 0.05% before molding. PSF can be molded by injection molding, molding, extrusion, thermoforming, blow molding, etc. The melt viscosity is high, and the control viscosity is the key to processing. After processing, heat treatment should be carried out to eliminate internal stress. Can be made into precision finished products.

PSF is mainly used in electrical and electronic, food and daily necessities, automotive, aviation, medical and other common assets, making all kinds of snoring devices, connectors, transformers, thyristor caps, bushings, coil bobbins, wiring Columns, printed circuit boards, bushings, covers, TV system parts, capacitor films, brush holders, alkaline battery boxes, wire and cable cladding. PSF can also be used as protective cover components, electric gears, battery covers, aircraft parts and components, astronaut outer shields, camera shutters, lamp components, and sensors. Instead of glass and stainless steel for steam plates, coffee containers, microwave cookers, milk containers, milker parts, beverages and food dispensers. Sanitary and medical things include surgical discs, sprayers, humidifiers, dental items, flow controllers, grooving units and implement room items. They can also be used for inserting teeth, with high bonding strength and chemical configuration (pump cover, tower) External protective layer, acid-resistant nozzle, pipeline, valve container), food processing configuration, processing and configuration of dairy products, environmental protection control infection configuration.

Window and door openings (headers, sills,jambs, thresholds, nailing flanges)

_Deck-to-wall intersections

_ Corner boards

_Wall-to-wall tie-ins

_Foundation sill plates

_Sheathing panel seams

_Under stucco finishes

_Car`s insulation

_ Roof detail areas

_ Gutters

_ Mobile home repair

_Other building joints.

_Exposed pipelines protection.

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