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vulcanization, chemical process by which the physical properties of natural or synthetic rubber are improved; finished rubber has higher tensile strength and resistance to swelling and abrasion, and is elastic over a greater range of temperatures. In its simplest form, vulcanization is brought about by heating rubber with sulfur. The process was discovered in 1839 by the U.S. inventor …
2. Devulcanization of elastomers. A very prominent form of recycling is the devulcanization, which is the process of total or partial cleavage of the cross-linkings formed during the initial vulcanization [5–8].Despite returning to the material its flow capacity, the higher the devulcanization degree, the greater the breakage of the main polymer chain links.
بازیافت پسمانده‌های لاستیکی به‌دلیل مشکلات زیست محیطی و همچنین افزایش قیمت لاستیک نو رو به فزونی دارد. از آنجا که لاستیک epdm پایۀ پلیمری بسیاری از قطعات لاستیکی اتومبیل (به‌جز تایرها) می‌باشد، ضرورت بازیافت و برگشت ...
Over 400 professionals from all over the world attended MARIS' product presentation "Evoluted Recycling Solutions for Rubber: Devulcanization Process" on May 19, 2021! The high participation shows that the tire recycling industry is interested in innovative technology solutions for end-of-life tire devulcanization.
Define devulcanization. Devulcanization as a verb means To process of treating vulcanized rubber so as to restore the materials that were present prior to vulc....
Devulcanization is a method of potentially "upgrading" end-of-life tire rubber. Devulcanized rubber is a higher valued form of end-of-life rubber, since devulcanized material can be partly revulcanized and partially replace rubber in specific compounds and applications, including tires. Currently, only a small number of devulcanization systems are operating on …
In general, composite materials are difficult to recycle. Tires belong to this class of materials. On top, one of their main constitutents, vulcanized rubber, is as elastomer, which cannot be remolten and hence is particularly challenging to put to a ...
Through the devulcanization of end-of-life tires (EL T), it is possible to produce new raw materials with good mechanical properties and a superior environmental footprint over products. The...
Devulcanization is the process by which the polymer attributes of vulcanization are reversed. Vulcanization, a chemical process for converting rubber or related polymers into more durable materials via the addition of sulfur or other equivalent "curatives" or "accelerators". and some sulfur-carbon bonds while importantly leaving intact the molecular carbon-carbon backbone …
Devulcanization, i.e., the breaking up of sulfur bonds by chemical, thermophysical, or biological means, is a promising route that has been investigated for more than 50 years. This review article presents an update on the state-of-the art in rubber devulcanization. The article addresses established devulcanization technologies and novel ...
Devulcanization lacks adequate test data and data interpretation, and it has poorly defined end product specifications without adequately justified and defined applications and uses. Research funds appear to be most available for studying devulcanization of single rubber types, as opposed to studying rubber types with complex mixtures such as ...
بازیافت لاستیک یا بازیافت ... ساختار مولکولهای تایر تغیر پیدا می‌کنند، پدیده‌ای که به نام devulcanization معروف است. در طی فرایندی به نام احیاء یا reclaim لاستیک‌های خرد شده تحت فشارهای ترمومکانیکی ...
Rubber Science, 29 (1): 62-100. The article presents the final part of the review on the current status of sulphur vulcanization and devulcanization chemistry. Though considerable scientific ...
Methods of Devulcanization. Walter C. Warner. Walter C. Warner. 1 Rubber World, 1867 W. Market St., Akron, OH 44313-6901. Search for other works by this author on: This Site. PubMed. Google Scholar. Rubber Chemistry and Technology (1994) 67 (3): 559–566.
Applied devulcanization process is based on the recognized effectiveness of several chemical reactions: free radical R•, organic cations R+ and acid / base A+ / B-. The synergy between these reactions and tribologic effects in …
خرید لاستیک. برای خرید لاستیک باید مراکز معتبری که بعنوان نمایندگی رسمی فروش لاستیک شناخته میشوند مراجعه کنید تا بتوانید لاستیک مناسب با خودروی خود و کاملا استاندارد را تهیه نمایید.
The devulcanization parameters (temperature and time) were chosen based on the data found in the literature (Kojima et al., 2005b, Jiang et al., 2013), seeking to perform a satisfactory devulcanization by consuming a reasonable amount of energy. Greater temperature and/or time were supposed to be harsh conditions to be used in NR ...
A review on devulcanization of waste tire rubber Enes Akca, Ali Gursel, Nuri Sen Abstract Rubber has become an indispensable material for the technological development of civilization, including simple balloon and complex rocket propellant. Rubber Industry worldwide is using on an average 50% of raw materials.
By devulcanization process the cross-links in the structure of rubber are broken and devulcanized rubber can be revulcanized into a raw material for rubber industry, which is a highly valued form...
Vulcanization or vulcanisation is a chemical process for converting rubber or related polymers into a more durable materials via the addition of sulfur or other equivalent "curatives". These additives modify the polymer by crosslinking polymer chains by formating bridges or crosslinks. The vulcanized material is less sticky toward metals or other compounds. A vast array of …
Devulcanization is accomplished by application of a controlled dose of microwave energy to sized material, preferably in a continuous process. Elastomer waste may be devulcanized without depolymerization to a material capable of recompounding and revulcanization into a product having physical properties essentially equivalent to the original ...
By devulcanization process the cross-links in the structure of rubber are broken and devulcanized rubber can be revulcanized into a raw material for rubber industry, which is a highly valued form of waste rubber. This study provides a review of the recent advances in understanding of methods of recycling rubber and claims that the capacity of ...
Devulcanization of rubber waste, whereby crosslinks are selectively broken, may provide a solution, as it allows it to be remolded into new shapes. We used two types of ground tire rubbers (GTRs) for this study; mechanically ground and waterjet-milled GTRs with different particle sizes. First, we revealed the effects of GTR particle size on the ...
Devulcanization التراسونیک یک روش سریع و کارآمد برای بازیافت لاستیک تایر زباله اجازه می دهد به استفاده مجدد از لاستیک زباله است. بازیافت لاستیک تایر التراسونیک فرایند نسبتا ساده است ، که با موفقیت آزمایش شده است. مقیاس پذیری فرآیند خطی بازیافت تایر اولتراسونیک امکان درمان حجم زیادی در مقیاس صنعتی در هزینه های اقتصادی را فراهم می کند.
Devulcanization in the Presence of Benzyl Chloride and Methyl Chloride.The above results suggest that catalyst efficiency might be improved when devulcanization is carried out with added alkylating agent.We find that this is, indeed, the case. Added benzyl chloride or methyl chloride further decreases the crosslink density for a given concentration of catalyst (Table 11).
This ultrasonically generated rubber melt can be reprocessed and moulded into new rubber products, e.g. new tires. A major advantage of ultrasonic devulcanization is the significantly lower heat required. First, the waste tire …
Devulcanization is a popular method of recycling rubber vehicle tires and other non-biodegradable rubber products. In order to make new products, rubber tires must have their rubber, metal, fabric, and other parts removed and separated. Recycled tire rubber is now prepped to be refined into crumb rubber or readied to be devulcanized.
UN-2. The product of devulcanization which results in the reduction of cross-links. UN-2. Disclosed is a method for producing an alcohol wherein an alcohol having a total sulfur content of not more than 10 ppm by weight is produced by performing at least one devulcanization treatment selected from devulcanization by a reaction, devulcanization ...
Different devulcanization methods such as chemical, mechanical, irradiation, biological and their combinations that have been explored until now are reviewed here. Besides, an overview of the latest development of devulcanization by ionic liquids and deep eutectic solvents are also described. While such devulcanization technique provides new ...
The atmospheric toxicity and cost of the commonly used devulcanization materials like chemical agents, oils and solvents have enabled a shift towards utilization of greener (mainly organic) and readily available devulcanization chemical components. This literature review paper discusses the approaches, which have less negative impact on the ...
A University of Waterloo professor has been recognized for originality, innovation, and creativity in the development of his rubber devulcanization technology. Awarded by the Polymer Processing Society (PPS), the 2018 James L. White Award was presented to Costas Tzoganakis, professor of chemical engineering, at the 34th International Conference of the …