Physical properties of Japanese Dongli PPS A673M-B: 1. Excellent electrical insulation (especially high-frequency insulation), white hard and brittle, metallic sound when dropped on the ground, light transmittance second only to organic glass, coloring resistance, water resistance, and excellent chemical stability. It has good flame retardancy and is a non combustible plastic. 2. The strength is average, the rigidity is good, but the texture is brittle and prone to stress cracking; Not resistant to organic solvents; Long term use can reach a temperature of 260 degrees Celsius and remain stable in air or medium at 400 degrees Celsius. By adding glass fiber or other reinforcing materials for modification, the impact strength can be greatly improved, and the heat resistance and other mechanical properties can also be enhanced. The density can be increased to 1.6-1.9, and the molding shrinkage rate can be reduced to 0.15-0.25%. It is suitable for making heat-resistant parts, insulation parts, chemical instruments, optical instruments and other parts.

Japanese Dongli PPS A673M-B plastic (polyether) is a thermoplastic special engineering plastic with excellent comprehensive performance, characterized by high temperature resistance, corrosion resistance, and superior mechanical properties. At present, the domestic distributors of PPS include Shanghai Lianmo Chemical, etc. By the year 2000, the world's PPS production could reach 50000 tons per year. English name: Polyphenylenesulfide Specific gravity: 1.36 grams per cubic centimeter Molding shrinkage rate: 0.7% Molding temperature: 300-330 ℃. It is a thermoplastic special engineering plastic with excellent comprehensive performance, characterized by high temperature resistance, corrosion resistance, and superior mechanical properties. PPS is an aromatic polymer. Linear PPS crosslinks at temperatures above 350 ℃ to form thermosetting plastics, while branched PPS is a thermoplastic.

PP is called poly, PPS is called polyether. They are two completely different types of plastics. The difference is not usually significant. PPS, also known as plastic steel, makes a metallic sound when dropped on the ground, and its material is as hard as metal, with a molding temperature of 300-330 ℃. Characteristics: High temperature and corrosion resistance, excellent mechanical properties. PP is a very ordinary plastic with few usage scenarios. The usage scenarios are very extensive.

Specific models and performance of Japanese Dongli PPS:

Characteristics of Japanese Dongli PPS A673M-B: Thermal properties: PPS has excellent thermal properties, can withstand 260 ℃ in the short term, and can be used for a long time at 200-240 ℃; Its heat resistance is comparable to PI, second only to F4 plastic, which is also rare in thermosetting plastics. Electrical properties: PPS has outstanding electrical properties. Compared with other engineering plastics, its dielectric constant and dielectric loss tangent are relatively low, and there is little change in frequency, temperature, and temperature range; PPS has good arc resistance, comparable to thermosetting plastics. PPS is commonly used as an electrical insulation material, accounting for about 30% of its usage.

Processing method: Other methods: (1) Injection molding: Universal injection molding machines can be used, and the melt index of glass fiber reinforced PPS is recommended to be 50. The process conditions for injection molding are: barrel temperature, pure PPS at 280-330 ℃, 40% GFPPS at 300-350 ℃; The nozzle temperature is 305 ℃ for pure PPS and 330 ℃ for 40% GFPPS; Mold temperature 120-180 ℃; Injection pressure, 50-130MPA. (2) Extrusion: using an exhaust extruder, the process is: the temperature in the feeding section is less than 200 ℃; The temperature of the material barrel is 300-340 ℃, the temperature of the connecting body is 320-340 ℃, and the temperature of the mouth mold is 300-320 ℃. (3) Compression molding: suitable for large products, using two compressions, cooling first, and then hot pressing. The preheating temperature for hot pressing is around 360 ℃ for pure PPS for 15 minutes, and around 380 ℃ for GFPPS for 20 minutes; The molding pressure is 10~30Mpa, and the mold is released after cooling to 150 ℃. (4) Spray forming: Both suspension spraying and a mixture of suspension spraying and dry powder thermal spraying are used to spray PPS onto the metal surface, followed by plasticization and quenching treatment to obtain the coating; The coating treatment temperature of PPS is above 300 ℃, and the insulation time is 30 minutes.

The application of PPS: In various fields of the mechanical industry, the use of nylon (PA), polyoxymethylene (POM), polyethylene terephthalate (PET), and polysulfone (PSU) all have defects that cannot meet technical requirements, and the use of polyimide (PI), polyetheretherketone (PEEK), and polyamide acyl (PAI) is too expensive. Choosing to use PPS should be an ideal engineering plastic. 1. Mechanical industry: Specially used for component preparation in high humidity and strong corrosion environments in the mechanical industry. Used for shells, structural components, wear-resistant parts, and sealing materials, such as pump casings, pump wheels, valves, bearings, bearing brackets, piston rings and gears, pulleys, fans, flow meter components, flanges, universal heads, counters, level gauges, etc. 2. Electronic appliances: PPS can account for 30% in the electronic appliance industry and is suitable for high-temperature electrical components with ambient temperatures above 200 ℃; Can manufacture point and electric cleaning brackets, starter coils, shielding covers, and blades for generators and engines; On a television, it can be used for high-voltage enclosures and sockets, terminal posts and terminal boards, etc; In the electronics industry, manufacturing of transformers, resistive coils, and relay skeletons and shells, integrated circuit carriers; Utilizing high-frequency performance to manufacture H-grade winding frames and fine-tuning capacitors. Micro electronic component packaging, connectors, connectors, sockets, coil frames, motor housings, electromagnetic adjustment disks, TV high-frequency head shafts, relays, fine-tuning capacitors, fuse holders, tape recorders, magnetic therapy devices and other components. It is also applied to precision instruments such as computers, timers, tachometers, copiers, cameras, temperature sensors, and the casings and components of various measuring instruments. 3. Automotive industry: PPS is used in the automotive industry, accounting for about 45%, mainly for automotive functional components; The components of the igniter, heater, carburetor, clutch, transmission, gearbox, bearing bracket, lampshade, bumper, fan, exhaust system, as well as the reflector and headlight holder. Can replace metal in making exhaust pipe circulation valves, water pump impellers, pneumatic signal modulators, etc.