manufacture antioxidant n,n-diphenyl-p-phenylenediamines
N,N'-Diphenyl-p-phenylenediamine's production and use as an antioxidant in rubbers may result in its release to the environment through various waste streams. If released to air, a vapor pressure of 6.35X10-9 mm Hg at 25 °C indicates N,N'-diphenyl-p-phenylenediamine will exist solely in the particulate phase in the ambient atmosphere.
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N,N'-DIPHENYL-P-PHENYLENEDIAMINE (ANTIOXIDANT DPPD) N,N'-Diphenyl-p-phenylenediamine is used as an antioxidant and/or stabilizer for rubber, petroleum oils and feedstuffs. It is also used as a polymerization inhibitor and a retardant against copper degradation.It is a chemical intermediate to make dyes, drugs, plastics and detergent additives.
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n n-diphenyl-p-phenylenediamine antioxidant h 74-31-7
n,n'-diphenyl-p-phenylenediamine (antioxidant dppd) N,N'-Diphenyl-p-phenylenediamine is used as an antioxidant and/or stabilizer for rubber, petroleum oils and feedstuffs. It is also used as a polymerization inhibitor and a retardant against copper degradation.It is a chemical intermediate to make dyes, drugs, plastics and detergent additives.
WESTCO™ DPPD synthetic and natural rubber antioxidant. WESTCO DPPD (N,N' Diphenyl-p-phenylenediamine) CAS# 74-31-7 WESTCO DPPD protects natural and synthetic rubber compounds against oxidation, flex cracking, stress cracking and heat aging; improves ozone resistance in CR.
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In a down-stroking press the main ram is situated above the movable top platen to which pressure is applied by a downward movement of the ram. DPG Abbreviation for diphenylguanidine, an organic accelerator. DPPD N,N´-Diphenyl-p-phenylenediamine, antidegradant staining. DPR Abbreviation for depolymerised rubber.
N,N-Diphenyl-p-Phenylenediamine DPPD, antidegradant staining. Dipping A method of manufacturing rubber articles by dipping a former of the shape required into a rubber solution or into compounded, 14 concentrated latex which may be either unvulcanised or vulcanised.
- Are p phenylenediamine (PPD) antioxidants in recycled tire rubber products toxic?
- Recently, roadway releases of N, N ′-substituted p -phenylenediamine (PPD) antioxidants and their transformation products (TPs) received significant attention due to the highly toxic 6PPD-quinone. However, the occurrence of PPDs and TPs in recycled tire rubber products remains uncharacterized.
- Which industrial rubber additives have higher chemical concentrations?
- Furthermore, we quantified 15 other industrial rubber additives (including bonding agents, vulcanization accelerators, benzotriazole and benzothiazole derivatives, and diphenylamine antioxidants), observing that PPD-derived chemical concentrations were 0.5–6 times higher than these often-studied additives.
- How do antioxidants reduce oxidation in rubber products?
- The rate of oxidation in commercial rubber products is often reduced using antioxidants based on the aromatic secondary amines which represent an important group of antioxidants used in this field. The most widely used antioxidants are N, N ′-substituted p -phenylenediamines (PPDs) , .
- What are substituted P phenylenediamines?
- Substituted p -phenylenediamines (PPDs), a class of antioxidants, have been widely used to extend the lifespan of rubber products, such as tires and pipes. During use, PPDs will generate their quinone derivatives (PPD-Qs). In recent years, PPDs and PPD-Qs have been detected in the global environment.
- Are P phenylenediamines antioxidants?
- These observations well correlate with the recent theoretical studies of antioxidant action of p -phenylenediamines proving that both the reaction enthalpies of hydrogen atom abstraction and the partial charges of the reaction centres in PPDs play an important role in the effectiveness of these antioxidants . Fig. 7.
- Are PPD antioxidants important contaminant classes in tire rubbers and elastomeric consumer products?
- These data emphasize that PPD antioxidants, PPDQs, and related TPs are important, previously overlooked contaminant classes in tire rubbers and elastomeric consumer products. Article subjects are automatically applied from the ACS Subject Taxonomy and describe the scientific concepts and themes of the article.
