Properties And Application Of Polyphenylene Sulfide Fiber

PPS (polyphenylene sulfide)

Physical properties of PPS fiber

Because polyphenylene sulfide fiber has high crystallinity, good mechanical properties, and stable size, it can be used in the process of small deformation, fully meet the requirements of use.

PPS fiber

Chemical stability of PPS fiber

PPS fiber has good chemical stability and can maintain its original performance under extremely bad conditions. Its chemical stability is second only to polytetrafluoroethylene fibers.

It is suitable for high-end applications in harsh environments.

At high temperature, PPS fibers can be placed in different inorganic reagents, and the original tensile strength can still be maintained after a week.

After 2 weeks in 93 and 10% sodium hydroxide solutions, the strength of the solution did not change significantly.

It also has excellent properties of organic reagents. Except for toluene at 93 C, its strength is slightly affected. In CCl4, chloroform and other organic solvents, even at boiling point, its strength can not change. The formic acid and acetic acid at 93 C have no effect on its strength.

To sum up, the chemical stability of PPS fiber is only inferior to that of tetrafluoroethylene fiber. Only when high temperature strong oxidants are used, can the fibers be degraded, so PPS fiber is suitable for filtering many strong corrosive chemical mediums.

Thermal properties of PPS fiber

PPS fiber has excellent thermal stability and excellent heat resistance. The melting point is 285 degrees centigrade, which is higher than that of other melt spinning fibers currently used in industrial production. Therefore, the size of the product is relatively stable, and the products made from PPS fiber are difficult to burn. It will burn when it is placed in the flame, but once the flame is removed, the combustion will stop immediately, the yellow orange flame will be formed when burning, and the trace black ash will be generated. The combustion products will not fall off and form residual coke, showing lower ignition delay and smoke density. The limit oxygen index can reach 34%-35%, and it will not burn under normal atmospheric conditions.

If used as filter fabric for bag filter room of coal-fired boiler, in wet acid environment, the long-term use temperature of PPS fiber is 150-170 degrees centigrade, the maximum usage temperature is 190 C, and its service life can reach 3 years or so.

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Application of PPS fiber

Because polyphenylene sulfide fibers are excellent in heat resistance, corrosion resistance and flame retardancy, they are widely used in environmental protection, chemical industry filtration and military fields.

For example: high temperature bag type dust collector, garbage incinerator, cement plant filter bag, electrical insulation material, flame retardant material, composite material used in thermal power plant. In addition, it can also be used for canvas, sewing thread, various protective cloth, heat resistant material, electric insulation material, electrolytic diaphragm and friction disc (brake).

PPS needle punched nonwovens or woven fabrics can be used for filtration of hot corrosive agents. They are ideal heat-resistant and corrosion resistant materials.

Needle felt tapes made from PPS fiber are used for drying machines in the paper industry. They can also be used for making special paper in the electronics industry.

Its monofilament or multifilament fabrics can also be used as defog materials, and Japan's Da he textile company develops PPS fiber into industrial filter cloth for flue gas and chemical filtration.

1, thermal power flue dust removal

PPS fiber is mainly used for filtering fabric in industrial combustion boiler bag filter room. Waste heat flue gas discharged from industrial furnace contains a variety of corrosive chemicals. The service life of the general materials is short and the filtering effect is poor.

The PPS filter fabric used for industrial coal-fired boilers can survive for 3 years in a wet acidic environment below 190 degrees Celsius.

The service life of polysulfonamide filter bag is only half a year to 1 years.

2. Iron and steel industry

Iron and steel industry is also one of the main sources of air pollution, and the use of bag filter is huge.

China's steel output has exceeded 3 billion tons. If we calculate the application of bag filter in Baosteel, we need a total of 21 million square meters of filter material, most of which are chemical fiber filter media.

According to the calculation of the service life of the filter bag for 3.5 years, the filter material needed to replace the filter bag is about 7 million square meters per year, which needs 3850 tons of fiber filter mat. That is to say, the bag filter in the iron and steel industry has larger room for expansion.

3. Cement industry

In recent years, more and more bag filters have been used in the new dry process cement production line of cement industry.

PPS fiber filter material also has great potential.

4, chemical filtration

In addition to its extensive and indispensable uses in the field of environmental protection, PPS fibers can also be used for filtration of chemicals that are highly corrosive and high in solution temperature, such as various organic acids and inorganic acids, various phenols and various strong polar solvents.

According to expert analysis, in 2010, domestic PPS fiber demand may reach 8000 tons, and in 2020, it will reach 20 thousand tons.

Polyphenylene sulfide fiber is an important high-performance fiber. Its mechanical properties, chemical and thermal properties are good. It is widely used in environmental protection and chemical filtration.

Due to the rapid development of China's industry, a large number of thermal power plants, cement plants, garbage incineration and other emissions of a large number of pollutants, the protection of the environment is imminent. For the development of environmental protection in China, making the air quality of the earth better and the blue sky bluer, it is very necessary to accelerate the development of PPS fiber.

It is suggested that the state increase investment to solve the key technology of fiber grade PPS resin and fiber production, and environmental protection engineering will provide a large number of high-performance polyphenylene ether fiber filter materials, which is of great practical significance and far-reaching historical significance.