CCS
Surface Treated Sulphur for Improved Dispersion.
Chemical Composition:
- Material: Treated / Modified Sulphur
- Appearance: Yellow Powder
- Ash, %: 1.0 Max.
- Mesh Size: 200 Min.
- Moisture, %: 1.0 Max.
Function:
Sulphur Dispersion has always been problem for rubber industry. This is particularly true for Nitrile Rubber, to some extent Polychloroprene and EPDM Rubber.
CCS has been electrically / chemically surface treated to avoid agglomeration. This electric charge allows the particles to disperse well in rubber matrix. It very effectively replaces Magnesium Carbonate Coated Sulphur.
Advantages of Using CCS:
- Avoids blooming during storage of green compound.
- No formation of aggregates appears in the rubber avoiding local over cure.
- Improved dispersion provides higher physical properties, both before and after ageing.
- In dynamic applications it provides higher service life. E.g. in rice dehusking rollers. Due to local burning and presence of phenolic resin in the product, failure of the product can be earlier and erratic. Proper dispersion of sulphur avoids such failure.
- In coloured applications, uniform dispersion of sulphur is very important, which is provided by CCS. Due to this brown spots are not observed on the surface.
Typical Applications:
- Rice Dehusking Rollers
- Football Cover
- Textile Cots and Aprons
- LPG Tubing
- Textile blankets and Rolls
- Oil Seals and O Rings based on NBR.
Mixing Cycle:
CCS treated sulphur should be mixed as usually followed for various rubbers. For Nitrile Rubber, it should be added immediately after rubber is warmed up and forms the band on the mill. For soft compounds, it can be added at the last stage of mixing. Tight nip refining will help further improvement in dispersion of CCS.
Please find below the classic example of ageing properties and compounding comparison:
Formula:
Nitrile Rubber (Medium): 100, ZnO: 5, Strearic Acid: 1, HAF: 30, Clay: 10, DOP: 10, CBS: 1.2, TMT: 0.2, Sulphur: 1.5
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Rheometric Test Report at 150° C
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MC
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CCS
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- Scroch Time, Ts2, Mins.
- Cure Time, Tc90, Mins.
- T Min., In LBS.
- T Max., In LBS.
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03.94
20.67
11.61
68.84
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04.17
21.39
11.57
67.96
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Curing Temp °C / Time Min.
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150/20
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150/20
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- Hardness (Shore A)
- Tensile Strength (kg/cm²)
- Elongation at break (%)
- Modulus: 300% (kg/cm²)
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62
162
550
56
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62
171
580
48
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Physical Testing After Ageing at 100 °C for 48 hrs.
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- Hardness (Shore A)
- Tensile Strength (kg/cm²)
- Elongation at break (%)
- Modulus: 300% (kg/cm²)
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68
144
410
100
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67
162
490
88
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Compression Set at 70 °C for 48 hrs, 25% Deflection (%)
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34.20
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30.10
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*Observation Remarks: Better physicals are observed with CCS over MC Sulphur.
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Formula:
Nitrile Rubber (Medium): 100, ZnO: 5, Strearic Acid: 1, HAF (N-330): 35, DOP: 10, CBS: 1.2, TMTD: 0.2, Sulphur: 1.5
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Properties
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Normal MC
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SCCARE CCS
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6-ppd
TDQ
Physical Testing Before Ageing
Cure Temp °C (ASTM)
Cure Time, Mins.
Hardness (Shore A)
Tensile Strenght (kg/cm²)
Elongation at Break (%)
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1.0
1.0
150
20
60
168
580
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0.7
0.5
150
20
60
176
610
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Physical Testing After Ageing at 100 °C for 70 hrs.
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- Hardness (Shore A)
- Tensile Strength (kg/cm²)
- Elongation at break (%)
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63 (+3)
153 (-9%)
380 (-34%)
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63 (+3)
160 (-9%)
390 (-35%)
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Compression Set at 70 °C for 48 hrs, 25% Deflection ASTMD - 395, (%)
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22.70
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16.80
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*Observation Remarks: CCS provide better before ageing properties as compared to MS Sulphur. Inspite of lower anti-oxidants/anti-ozonants, properties are similar after ageing.
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Formula:
Nitrile Rubber (Medium): 100, ZnO: 5, Strearic Acid: 1, HAF: 30, DOP: 10, CBS: 1.2, TMT: 1.2, Sulphur: 1.5
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Properties
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MC
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SCCARE CCS
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CLAY, phr
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60
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70
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Physical Testing Before Ageing
Cure Temp°C
Cure Time, Mins.
Hardness (Shore A)
Tensile Strenght (kg/cm²)
Elongation at Break (%)
Compression Set, 25% Deflection at 100°C for 24 hrs (%)
|
150
20
68
92
380
52.10
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150
20
69
98
375
50.17
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*Observation Remark: Additional China Clay does not deter CCS
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