water treatment agent ursol rubber antioxidant
water treatment agent ursol rubber antioxidant
water treatment agent ursol rubber antioxidant
water treatment agent ursol rubber antioxidant
water treatment agent ursol rubber antioxidant
recent progress in the rubber antioxidants: a review

Recent progress in the rubber antioxidants: A review

The strategies to improve the anti-oxidative efficiency of rubber antioxidants have been presented. ? Recent advances to minimize the blooming and migration of antioxidants have been summarized. ? The toxicity issues of rubber antioxidants has been discussed. ? The perspectives on the future trends of rubber antioxidants have been presented.

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rubber antioxidants and their transformation products: environmental occurrence and potential impact

Rubber Antioxidants and Their Transformation Products: Environmental Occurrence and Potential Impact

Antioxidants are prevalently used during rubber production to improve rubber performance, delay aging, and extend service life. However, recent studies have revealed that their transformation products (TPs) could adversely affect environmental organisms and even lead to environmental events, which led to great public concern about environmental occurrence and potential impacts of rubber ...

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rubber antioxidants and their transformation products: environmental occurrence and potential impact - pmc - national center for biotechnology

Rubber Antioxidants and Their Transformation Products: Environmental Occurrence and Potential Impact - PMC - National Center for Biotechnology

1. Introduction Many unidentified chemicals and related transformation products (TPs) are released into the environment during the life-cycle of commercial products. Efforts in evaluating their adverse impacts were usually not taken until these chemicals become globally ubiquitous.

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new evidence of rubber-derived quinones in water, air, and soil | environmental science & technology - acs publications

New Evidence of Rubber-Derived Quinones in Water, Air, and Soil | Environmental Science & Technology - ACS Publications

3.3. Human Exposure Assessment. Since the identified sources of rubber-derived quinones, such as roadside soil, runoff water, and air particles, are closely related to human activities, we anticipate that human exposure to PPD-Qs and their parent compounds via diet, inhalation, and dermal absorption is plausible.

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rubber antioxidant 4020 6ppd powder rubber antioxidant | provide water treatment agents for industries water treat

rubber antioxidant 4020 6ppd powder rubber antioxidant | Provide water treatment agents for industries water treat

Application: As a kind of ursol rubber antioxidant, 6PPD has better compatibility with rubbers, seldom blooming, low volatility, low toxicity, with excellent antioxidant, anti-ozone, anti-flex cracks, anti-insolation cracks, strong inhibition on copper ormanganese and

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occurrence of substituted p-phenylenediamine antioxidants in dusts | environmental science & technology letters - acs publications

Occurrence of Substituted p-Phenylenediamine Antioxidants in Dusts | Environmental Science & Technology Letters - ACS Publications

The substituted p-phenylenediamines (PPDs) represent a suite of effective antioxidants broadly applied in rubber industries. However, knowledge of their environmental occurrences and fate remains extremely limited. Herein, we explored the occurrence of six major PPD antioxidants and one newly defined transformation product in dust particles from different environments, including roads ...

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transformation products of tire rubber antioxidant 6ppd in heterogeneous gas-phase ozonation: identification and environmental occurrence

Transformation Products of Tire Rubber Antioxidant 6PPD in Heterogeneous Gas-Phase Ozonation: Identification and Environmental Occurrence

6PPD, a tire rubber antioxidant, poses substantial ecological risks because it can form a highly toxic quinone transformation product (TP), 6PPD-quinone (6PPDQ), during exposure to gas-phase ozone. Important data gaps exist regarding the structures, reaction mechanisms, and environmental occurrence of TPs from 6PPD ozonation. To address these data gaps, gas-phase ozonation of 6PPD was ...

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recent progress in the rubber antioxidants: a review

Recent progress in the rubber antioxidants: A review

This review mainly focused on thermo-oxidative aging because it is the most common aging type for rubbers. The oxidative degradation of rubber proceeds by a free-radical chain reaction mechanism [1]. As shown in Fig. 1a, rubber aging processes have three distinct phases: (i) Initiation, (ii) Propagation, and.

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(pdf) rubber antioxidants and their transformation products: environmental occurrence and potential impact

(PDF) Rubber Antioxidants and Their Transformation Products: Environmental Occurrence and Potential Impact

antioxidants are the main rubber antioxidants produced and used in China, of which 6PPD and 2,2,4-T rimethyl-1,2-dihydroquinoline (TMQ, RD) have the highest production, account- ing for more than ...

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on the dehydrogenation of n,n¡ä-substituted p-phenylenediamine antioxidants. i. n-phenyl-n¡ä-isopropyl-p-phenylenediamine (ippd ...

On the dehydrogenation of N,N¡ä-substituted p-phenylenediamine antioxidants. I. N-Phenyl-N¡ä-isopropyl-p-phenylenediamine (IPPD ...

Standard B3LYP/6-31G ? geometry optimizations of N-phenyl-N¡ä-isopropyl-p-phenylenediamine (IPPD, model A ¨C see Fig. 1) and its doubly dehydrogenated products either at N A and N B sites (N,N¡ä-dehydrogenated IPPD, model B) or at N B and C X sites (N¡ä,C-dehydrogenated IPPD, model C) or at N A and C X sites (N,C-dehydrogenated IPPD, model D) in singlet and triplet spin ground states ...

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