Nitrile rubber: Difference between revisions
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==Dangers== |
==Dangers== |
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Do not use these gloves when working with red fuming nitric acid, as sudden combustion of these two chemicals could cause serious chemical burns. Caution must be taken when working with the acid and the gloves at the same time. |
Do not use these gloves when working with red fuming nitric acid, as sudden combustion of these two chemicals could cause serious chemical burns. Caution must be taken when working with the acid and the gloves at the same time. |
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==Market== |
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Nitrile rubber market is on a steady revival path with the shut-down facilities being in a re-open stage. Due to the increasing activities within the automobile and construction sectors the demand on the market for nitrile rubber is also on rise. |
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The key contributors for the nitrile rubber market activities revitalization are the large-scale projects and facilities launches in the countries of the Middle East and Asia-Pacific. The total volume of the global nitrile rubber market is projected to outpace 0,65 mln tonnes in five years time.<ref>{{cite web |url=http://mcgroup.co.uk/news/20120111/automobile-construction-industries-revival-drive-nitrile-rubber-demand.html|title=Automobile & Construction Industries Revival Drive Nitrile Rubber Demand }}</ref> |
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==See also== |
==See also== |
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Revision as of 13:56, 6 April 2012
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| ECHA InfoCard | 100.107.385 |
CompTox Dashboard (EPA)
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Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Nitrile rubber, also known as Buna-N, Perbunan, or NBR, is a synthetic rubber copolymer of acrylonitrile (ACN) and butadiene. Trade names include Nipol, Krynac and Europrene.
Nitrile butadiene rubber (NBR) is a family of unsaturated copolymers of 2-propenenitrile and various butadiene monomers (1,2-butadiene and 1,3-butadiene). Although its physical and chemical properties vary depending on the polymer’s composition of nitrile, this form of synthetic rubber is generally resistant to oil, fuel, and other chemicals (the more nitrile within the polymer, the higher the resistance to oils but the lower the flexibility of the material).
It is used in the automotive and aeronautical industry to make fuel and oil handling hoses, seals, and grommets. It is used in the nuclear industry to make protective gloves. NBR’s ability to withstand a range of temperatures from -40 °C to +108 °C makes it an ideal material for aeronautical applications. Nitrile butadiene is also used to create moulded goods, footwear, adhesives, sealants, sponges, expanded foams, and floor mats.
Its resilience makes NBR a useful material for disposable lab, cleaning, and examination gloves. Nitrile rubber is more resistant than natural rubber to oils and acids, but has inferior strength and flexibility. Nitrile gloves are nonetheless three times more puncture-resistant than natural rubber gloves.[1]
Nitrile rubber is generally resistant to aliphatic hydrocarbons. Nitrile, like natural rubber, can be attacked by ozone, aromatic hydrocarbons, ketones, esters and aldehydes.
Production
Emulsifier (soap), 2-propenenitrile, various butadiene monomers (including 1,3-butadiene, 1,2-butadiene), radical generating activators, and a catalyst are added to polymerization vessels in the production of hot NBR. Water serves as the reaction medium within the vessel. The tanks are heated to 30–40 °C to facilitate the polymerization reaction and to promote branch formation in the polymer. Because several monomers capable of propagating the reaction are involved in the production of nitrile rubber the composition of each polymer can vary (depending on the concentrations of each monomer added to the polymerization tank and the conditions within the tank). One repeating unit found throughout the entire polymer may not exist. For this reason there is also no IUPAC name for the general polymer. The reaction for one possible portion of the polymer is shown below:
- 1,3-butadiene + 1,3-butadiene + 2-propenenitrile + 1,3-butadiene + 1,2-butadiene → nitrile butadiene rubber
Monomers are usually permitted to react for 5 to 12 hours. Polymerization is allowed to proceed to ~70% conversion before a “shortstop” agent (such as dimethyldithioarbamate and diethyl hydroxylamine) is added to react with the remaining free radicals. Once the resultant latex has “shortstopped”, the unreacted monomers are removed through a steam in a slurry stripper. Recovery of unreacted monomers is close to 100%. After monomer recovery, latex is sent through a series of filters to remove unwanted solids and then sent to the blending tanks where it is stabilized with an antioxidant. The yielded polymer latex is coagulated using calcium nitrate, aluminium sulfate, and other coagulating agents in an aluminium tank. The coagulated substance is then washed and dried into crumb rubber.
The process for the production of cold NBR is very similar to that of hot NBR. Polymerization tanks are heated to 5–15 °C instead of 30–40 °C. Under lower temperature conditions, less branching will form on polymers (the amount of branching distinguishes cold NBR from hot NBR).
Applications
The uses of nitrile rubber include non-latex gloves for the healthcare industry, automotive transmission belts, hoses, O rings, gaskets, oil seals, V belts, synthetic leather, printer's roller, and as cable jacketing; NBR latex can also be used in the preparation of adhesives and as a pigment binder.
Unlike polymers meant for ingestion, where small inconsistencies in chemical composition/structure can have a pronounced effect on the body, the general properties of NBR are not altered by minor structural/compositional differences. The production process itself is not overly complex; the polymerization, monomer recovery, and coagulation processes require some additives and equipment, but they are typical of the production of most rubbers. The necessary apparatus is simple and easy to obtain. For these reasons, the substance is widely produced in poorer countries where labor is relatively cheap. Among the highest producers of NBR are mainland China and Taiwan.
A hydrogenated version of nitrile rubber, HNBR, also known as HSN (highly saturated nitrile) is commonly used to manufacture o-rings for automotive air-conditioning systems.[2]
In January 2008 the European Commission imposed fines totaling €34,230,000 on the Bayer and Zeon groups for fixing prices for nitrile butadiene rubber, in violation of the EU ban on cartels and restrictive business practices (Article 81 of the EC Treaty and Article 53 of the EEA Agreement).[3]
Criminals have also been known to wear these gloves during the commission of their crimes. These gloves are often chosen because of their tight, thin fit that allows the hands to remain dexterous. Ironically, because of the thinness of these gloves, fingerprints may actually pass through the material as glove prints, thus transferring the wearer's prints onto whatever surface is touched or handled.[4][5]
Dangers
Do not use these gloves when working with red fuming nitric acid, as sudden combustion of these two chemicals could cause serious chemical burns. Caution must be taken when working with the acid and the gloves at the same time.
Market
Nitrile rubber market is on a steady revival path with the shut-down facilities being in a re-open stage. Due to the increasing activities within the automobile and construction sectors the demand on the market for nitrile rubber is also on rise.
The key contributors for the nitrile rubber market activities revitalization are the large-scale projects and facilities launches in the countries of the Middle East and Asia-Pacific. The total volume of the global nitrile rubber market is projected to outpace 0,65 mln tonnes in five years time.[6]
See also
References
- ^ Crystal, Garry (2008). "What are Nitrile Gloves?". wise GEEK. Conjecture Corporation. Retrieved 2008-02-05.
- ^ http://orings.com/tech_compound.php
- ^ Simon Zekaria (23 January 2008). "Bayer, Zeon fined 34.2 mln eur for synthetic rubber cartel activity". Forbes. AFX News.
- ^ http://www.chacha.com/question/do-latex-gloves-conceal-fingerprints%3F-if-so%2C-why Do latex gloves conceal fingerprints? If so, Why?
- ^ http://scienceman.org/Archives/forensics/perident.html Personal Identification: Fingerprints
- ^ "Automobile & Construction Industries Revival Drive Nitrile Rubber Demand".
External links
- MERL - Rubber Selection Guide
- Nitrile Rubber, AAA Acme Rubber Co
- Risk Assessment of Butadiene, CAS No. 106-99-0, EINECS No.203-450-8, June 2001
- Existing Substances Evaluation: Butadiene, The Green Lane, Environment Canada
- Antitrust: Commission fines synthetic rubber producers € 34.2 million for price fixing cartel, EUROPA Portal
- Quality Standards for Nitrile Gloves
- Information & Resource Site on Nitrile Gloves