Polyphenylene sulfide fiber, also known as PPS fiber. It is prepared from polyphenylene sulfide by melt spinning. Phillips company of the United States industrialized in 1983, with the trade name of Ryton PPS fiber. The polymer is prepared by polycondensation of sodium sulfide and dichlorobenzene in N-methylpyrrolidone or organic polar solvent containing alkali metal carboxylate. The melting point is 285 ℃. Amber, strength 0.18 ~ 0.26n/tex, elongation 25% ~ 35%, initial modulus 2.65 ~ 3.53n/tex. With good heat resistance, it is mainly used as high-temperature filter fabric, and the withstand temperature can reach 190 ℃. The fiber also has excellent chemical reagent resistance, hydrolysis resistance and flame retardancy. It can be used as flame retardant fabric, home decoration fabric, flue gas filter material, etc.PPS fiber not only plays an outstanding role in the field of filtration, its monofilament or multifilament fabric can also be used as demisting material, paper machine drying cloth, sewing thread, various protective cloth, electrical insulation material, heat-resistant clothing material and other materials; In addition, PPS fiber can be used to make long fiber reinforced composites for military industry, aerospace and other fields. PPS fiber fabric is treated with a mixture of fluorine gas, oxygen and nitrogen, which is especially suitable for isolation material of electrochemical energy storage device.

Polyester is widely used in the manufacture of clothing fabrics and industrial products. It has excellent setting performance. It is an important variety of synthetic fibers. It is a fiber polymer made by the exchange and reaction of specific chemical elements and a fiber made by spinning and treatment. Polyester is a cheap, durable and non deformable fabric.Wear resistance: the wear resistance of polyester is second only to nylon and ranks second among synthetic fibers.Water absorption: polyester has low water absorption and moisture regain and good insulation performance, but due to low water absorption, large static electricity generated by friction and poor dyeing performance.Polyester is widely used in the manufacture of clothing fabrics and industrial products. It has excellent setting performance. It is an important variety of synthetic fibers. It is a fiber polymer made by the exchange and reaction of specific chemical elements and a fiber made by spinning and treatment. Polyester is a cheap, durable and non deformable fabric.

PPS fiber has good chemical stability. It can still maintain its original performance under extremely bad conditions. It has excellent chemical stability, second only to polytetrafluoroethylene fiber.1. At high temperature, the original tensile strength can be maintained after being placed in different inorganic reagents for one week.2. It has good resistance to organic reagents. Except that toluene at 93 ℃ has a slight effect on its strength, its strength will not change in organic solvents such as carbon tetrachloride and chloroform even after rotating for one week at the boiling point, and formic acid and acetic acid at 93 ℃ have no effect on its strength.3. The nonwoven filter fabric made of PPS fiber has good corrosion resistance in 50% sulfuric acid at 93 ℃, and has no significant effect on the strength retention.4. There was no significant change in strength after being placed in sodium hydroxide solution at 93 ℃ for 2 weeks.PPS fiber processed products are difficult to burn, and can meet UL-94V-0 standard without adding flame retardant. When placed in the flame, although it will burn, it will not drip, and it will be far away from the fire. When burning, it shows orange yellow flame and generates a trace of black soot. The smoke generation rate is lower than that of halogenated polymers. The combustibles do not fall off and form residual coke, showing low smoke density and good flame retardancy.

PPS fiber products can be used for paint, paint, high-temperature flue filtration, dust removal bag, fast air flow filter bag, chemical industry filter bag, paper industry, drying in electrical industry, needle felt, coating, special cable coating, flame retardant substances in aerospace industry, etc. PPS fiber is always a special fiber that can be used in high-temperature corrosive environment and high-performance during production, Among them, Daiwa textile company of Japan developed PPS fiber as industrial filter cloth coating for chemical filtration in the field of wet filtration. The mixture of PPS fiber and CF can be used as reinforcement of high-performance composites.And the conforming materials for aerospace are non stretched PPS fluorocarbon paint, which has large amorphous, exothermic epoxy zinc rich primer at 125 ℃, the glass transition temperature is 93 ℃, the melting point is 281 ℃, and the crystallization can be increased by 60 ~ 80% when the stretched fiber is heat treated at temperature. Therefore, the stretched fiber has no obvious glass transition or crystallization exothermic phenomenon, Its melting point is 284 ℃. With the increase of crystallinity after tensile thermal characterization, the density of fiber increases accordingly. Compared with coating grade and injection grade PPS, the properties of PPS resin for fiber are very different. There are higher requirements for phase linear degree, molecular weight, polydispersity coefficient, melt index, melting viscosity of alcohol acid paint and impurities. The basic characteristics of fiber grade PPS are as follows:, PPS fiber non-woven filter fabric can meet most of the dry filtration operations. It can maintain high residual strength when used for a long time at high temperature and dry heat. PPS fiber can still maintain its original performance under extremely bad conditions.It has outstanding chemical stability of epoxy zinc rich primer, second only to polytetrafluoroethylene fiber. Only strong oxidant can degrade the fiber at high temperature. Therefore, PPS fiber is suitable for filtration of many strong corrosive chemical media. Like most conventional fibers, alkyd ready mixed paint, PPS fiber has excellent textile processing performance and is very easy to manufacture and process, PPS can be spun into multifilament, polyurethane paint and monofilament of various specifications. There are many factors affecting the embroiderability of PPS, but the main ones are molecular structure and melt index. The better the linearity of PPS resin, the better the spinnability.

PPS fiber has good chemical stability. It can still maintain its original performance under extremely bad conditions. It has excellent chemical stability, second only to polytetrafluoroethylene fiber.1. At high temperature, the original tensile strength can be maintained after being placed in different inorganic reagents for one week.2. It has good resistance to organic reagents. Except that toluene at 93 ℃ has a slight effect on its strength, its strength will not change in organic solvents such as carbon tetrachloride and chloroform even after rotating for one week at the boiling point, and formic acid and acetic acid at 93 ℃ have no effect on its strength.3. The nonwoven filter fabric made of PPS fiber has good corrosion resistance in 50% sulfuric acid at 93 ℃, and has no significant effect on the strength retention.4. There was no significant change in strength after being placed in sodium hydroxide solution at 93 ℃ for 2 weeks.

Practice has proved that the following technologies are effective for the production of high-performance aramid fiber.1. Super stretching technology, usually greater than 10 times, is used to obtain a highly oriented fiber structure.2. Increase the hydrogen bond in the molecular chain to improve the rigidity of the molecular chain, and increase the hydrogen bond between the molecular chains to improve the radial strength of the fiber.3. The rigidity, flexibility, regularity, crystallinity and hydrogen bond density of molecular chain are adjusted by copolymerization.4. A more rigid and regular molecular chain was synthesized, and a highly oriented straight chain structure was obtained by liquid crystal spinning.5. Repair technologies for structural defects, such as fine denier, impregnation heat treatment, high-pressure spinning, etc.6. Space for structural adjustment of primary fiber shall be reserved for heat treatment.