Pilnox SP is a very widely used and inexpensive non-staining, non discoloring antioxidant for white / colored or transparent rubber products based on NR, IR, SBR, BR, NBR, CR, etc. Pilnox SP also finds applications as a stabilizer for synthetic rubbers and plastics such as Polypropylene, Polyethylene, high impact polystyrene, adhesives, oils and plasticizers.
Pilnox SP disperses very easily in dry rubber compounds and does not bloom or affect the color, odor & transparency of the rubber product.
Pilnox SP does not influence the viscosity, scorch and cure characteristics of rubber compounds nor does it have any influence on unaged mechanical properties of rubber vulcanizates. Pilnox SP has a very low volatility and thus is a highly persistent antioxidant.
Pilnox SP is used at 1.0-3.0 phr levels as a non-staining antioxidant in rubber compounds based on NR and other synthetic rubbers. Pilnox SP offers good oxidation, heat and ozone resistance as well as flex fatigue resistance to transparent / white / colored rubber vulcanizates and exhibits good ‘Color fastness’ characteristics. The combination of Pilnox SP and antioxidant Pilnox TDQ offer synergistic effect to improve the heat ageing resistance of rubber vulcanizates at lower cost but with only slight discoloration.
Pilnox SP is a suitable antioxidant for normal as well as heat sensitized NR latex based compounds and its performance in NR latex based vulcanizates is similar to that of NR dry rubber based vulcanizates. Pilnox SP is
added to latex based compounds in the form of 50% active content emulsion which is prepared as follows:
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Ingredients
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Parts by weight
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Pilnox SP
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50
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Oleic acid
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2
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Triethanol amine
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0.5
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Potassium hydroxide (KOH)
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0.5
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Water
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47
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Total
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100
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Method: Triethanol amine, KOH and water are mixed & heated to 60-65ºC under high speed stirring and are added to previously heated (65-70ºC) & well stirred mixture of Pilnox SP-Oleic acid under high speed stirring. The resultant mixture is allowed to cool to room temperature and filtered through a fine filter cloth or passed through a colloid mill.
[2.4 kg of this emulsion added to a barrel (195 liter) of NR latex = 1.0 phr (dry basis) Pilnox SP]
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Pilnox SP is widely used as non staining and non discoloring antioxidant for the manufacture of transparent / white / colored products at 0.5 – 3.0 phr dosage for the manufacture of products such as hot water bottles, cut threads, sponges, latex foam, coir foam latex threads, tubing, surgical gloves, condoms, teats, balloons, rubber bands etc.
A 1:1 combination of Pilnox SP and antioxidant Pilnox TDQ offer synergistic effect & improve the heat ageing resistance of NR vulcanizates.