Polyphenylene sulfide
1. Introduction
Polyphenylene sulfide (PPS) plastic is a thermoplastic special engineering plastic with excellent comprehensive performance, featured by high temperature and corrosion resistance as well as superior mechanical properties.
With years of technical research and development, and long-term production and operation experiences, Whitefan Chemical has mature and reliable production technology to produce polyphenylene sulfide.
It consists of two different processes: Flash process unit and Quench process unit, which can be used to produce coating, injection molding, fiber and film grade PPS. The producer can adjust the proportion of the above products according to market demand.
2 raw material product indicators
1.1 p-Dichlorobenzene raw material specifications
Table 2-1 Quality indicators of p-dichlorobenzene
project | specification | Remarks |
Exterior | White flake or granular crystal | |
Purity | >99.9 % | |
Melting point | 54±1°C | |
Humidity | ≤ 0.1 % | |
Low boiler | ≤ 0.05% | |
High boiler | ≤ 0.1% | |
Chlorinated benzene | <400 ppm | |
M-dichlorobenzene | <100 ppm | |
O-dichlorobenzene | <250 ppm | |
Trichlorobenzene | <100 ppm |
2.2 Methylpyrrolidone (NMP)
Table 2-2 Methylpyrrolidone (NMP) quality indicators
project | specification | Remarks |
Exterior | Transparent, colorless liquid | |
Purity | ≥99.8 wt % | |
Water content | ≤ 0.05 wt % | |
Total impurity content | ≤ 0.15 wt % | |
Color, transparency | ≤ 30 |
2.3 sodium hydrosulfide (dihydrate)
Table 2-3 Sodium hydrosulfide (dihydrate) quality indicators
project | specification | Remarks |
Exterior | White - lemon yellow solid (small sheet) | |
Purity NaHS | ≥45 wt % or 60 wt % | |
Na2S | ≤ 2.5 wt % | |
Na2SO3 | ≤ 1.5 wt % | |
Na2CO3 | ≤ 1.0 wt % | |
Iron | ≤ 20 ppm | |
Insolubles | ≤ 0.005 wt % |
2.4 anhydrous sodium acetate
Table 2-4 Quality indicators of anhydrous sodium acetate
project | specification | Remarks |
Exterior | White powder | |
Purity | >99 % | |
pH | 7.5 – 9.0 | |
Arsenic | ≤ 0.0003 wt % | |
Total amount of heavy metals | ≤ 0.001 wt % | |
Insoluble water | ≤ 0.01 wt % |
2.5 sodium hydroxide (50% film grade)
Table 2-5 Sodium hydroxide quality indicators
project | specification | Remarks |
Total alkalinity (Na2O) (wt. %) | 38.36 - 39.50 | |
Hydroxide alkalinity (NaOH) (wt. %) | 49.50 - 51.00 | |
Sodium carbonate (Na2CO3) (wt. %) | 0.05 | |
Sodium chloride (NaCl) (ppm, wt.) | 100 | |
Sodium chlorate (NaClO3) (ppm, wt.) | 10.0 | |
Sodium sulfate (Na2SO4) (ppm, wt.) | 25 | |
Iron (Fe) (ppm, wt.) | 3.0 | |
Copper (Cu) (ppm, wt.) | 0.30 | |
Nickel (Ni) (ppm, wt.) | 0.50 |
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