accurate and stable detection of p-phenylenediamine
- Classification:Chemical Auxiliary Agent
- Purity:97.%
- Type:Rubber antioxidant
- Appearance:Amber to brown flake or granular
- Environmental Protection:Yes
- Application:Rubber Auxiliary Agents
- Production Capacity:5000 Ton/Tons per Month
- Package:25kg/barrel
on the dehydrogenation of n,n′-substituted p-phenylenediamine,using b3lyp/6-31g ∗ treatment, the optimal geometries, electronic structures and ir spectra of n -phenyl- n ′-isopropyl- p -phenylenediamine antioxidant (ippd) and its doubly dehydrogenated oxidation products have been obtained. experimental ir spectra of ippd sample heated in air at 140 ℃ correspond to the doubly dehydrogenated ippd
protective antioxidants can effectively scavenge free radicals, thereby reducing the photodegradation of chemicals [39]. based on this principle, we propose a novel approach to achieve stable extraction by adding antioxidants to reduce the oxidative degradation of ppds and their tps.
toxicity of substituted p-phenylenediamine antioxidants
substituted para-phenylenediamines (ppds) are synthetic chemicals used globally for rubber antioxidation, with their quinone derivatives (ppd-qs) raising particular environmental concerns due to their severe toxicity to aquatic organisms.
the effect of antioxidant concentration of n-isopropyl-n,study the influence of high concentrations of antioxidants n-isopropyl-n-phenyl-p-phenylenediamine (ippd) and 2,2,4-trimethyl-1,2-dihydroquinoline (tmq) and the mixing time of the vulcanization physical properties, thermal properties, mechanical properties and structure micro on natural rubber compound has been done.
data for effects of lanthanum complex on the thermo-oxidative
data presented in this article was used to investigate the different protective effects on the thermo-oxidative aging properties of two formulations of nr one with the antioxidant ippd and the other with the mixed antioxidants composed of antioxidant ippd and lanthanum (la) complex.
widely used chemical rubber antioxidant ippd,N-Isopropyl-N'-phenyl-p-phenylenediamine (often abbreviated ippd) is an organic compound commonly used as an antiozonant in rubbers. like other p-phenylenediamine-based antiozonants it works by virtue of its low ionization energy, which allows it to react with ozone faster than ozone will react with rubber. [2]
improvements of lanthanum complex on the thermal-oxidative
mixed antioxidants composed of antioxidant ippd and novel rare earth lanthanum complex were used as an additive to prepare natural rubber (nr) samples. the variations of macro-properties, surface characterizations, and internal groups were investigated by mechanical testing, x-ray photoelectron spectroscopy, and thermogravimetric analysis
new evidence of rubber-derived quinones in water, air for sale,among the identified quinones, n (1,3-dimethylbutyl)- n ′-phenyl- p -phenylenediamine quinone has been recently found to be highly toxic, causing acute mortality of coho salmon in the pacific northwest.
rubber antioxidants and their transformation products
in this review, we first summarize the category and application of rubber antioxidants in the world, and then demonstrate the formation mechanism of their tps in the environment, emphasizing their influence on the ozone oxidative degradation.
widely used good price rubber antioxidant ippd,substituted para-phenylenediamine (ppd) antioxidants have been extensively used to retard oxidative degradation of tire rubber and were found to pervade multiple environmental compartments. however...
- Are PPD antioxidants toxic?
- An increasing number of studies have focused on the toxicity of these PPD antioxidants. (8−10,15,33) According to the European Chemical Agency, several of them were labeled as very toxic to aquatic life with long-lasting effects and harmful if swallowed and may cause an allergic skin reaction.
- Are P phenylenediamines effective antioxidants in polyisoprene rubber?
- The antioxidant effectiveness of a series of N, N ′-substituted p -phenylenediamines in polyisoprene rubber has been studied by the non-isothermal DSC measurements , (for the details of the method see Refs. , , , ).
- What is the bioluminescence inhibition EC 50 of PPD-Q?
- Bioluminescence inhibition EC 50 of PPD-Qs ranged from 1.76–15.6 mg/L, with several emerging PPD-Qs demonstrating significantly higher toxicity than the well-studied 6PPD-Q.
- Does exposure to PPD-QS induce oxidative stress?
- Given that the elevated ROS level can trigger the oxidative stress defense and reduce the metabolic activity, it can be deduced that exposure to PPD-Qs would induce oxidative stress in V. fischeri, which is consistent with the responses of their parent PPDs and PAH-Qs.
