For example, carboxylated nitrile latexes such as Perbunan N latex KA8250 and KA8425 (Bayer Corp.), are suitable for use in the subject invention. Nitrile latexes can be carboxylated or noncarboxylated; carboxylated nitrile latexes are preferred. However, in certain embodiments, a nitrile latex with a lower level of acrylonitrile can be employed. has lower elastic modulus, can be made using a polymer which contains less acrylonitrile or by crosslinking the polymer to a lesser degree. In another aspect, the invention provides a sulfur-cured carboxylated nitrile rubber, wherein the rubber is substantially free of zinc oxide, and further characterized in that the rubber has a 300% modulus of elasticity in the range of about 400 psi to about 1100 psi, and in that the cured rubber has a tensile strength greater than about 5000 psi. The residence time of the form in the latex composition can be selected to obtain a film of a desired thickness on the form. Thus, the compositions described above can be made using standard rubber processing equipment and techniques, thereby avoiding retooling, which can be expensive. HNBR is a hydrogenated version of NBR (nitrile) rubber. The carboxyl groups are present at levels of 10% or less. Important Note: These are Starting Point Rubber Compounding Formulations for providing guide lines only and should be confirmed by laboratory trials. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). As described below, certain components of the nitrile rubber can be added at any time during the compounding process, while other components are preferably added in a specific order. NORTH SAFETY PRODUCTS L.L.C.,RHODE ISLAND. combining a nitrile latex with a stabilizing agent, adjusting the pH of the nitrile latex to about 8.5-10.0 to yield a basic nitrile latex, and. Such composite articles can, in some embodiments, provide qualities such as increased chemical resistance, puncture resistance, or tensile strength compared to conventional articles. Owner name: 8. contacting the basic nitrile latex with a crosslinking agent and with at least one accelerator, and selecting said crosslinking agent to be substantially free of metallic oxide that ionically crosslinks carboxylic acid moieties of the latex to form a nitrile rubber composition. Thicker gloves provide better strength and chemical resistance, which is desirable, e.g., for laboratory or industrial gloves. Exemplary manufacturing methods include casting, dipping, molding, and the like. Except where otherwise noted, data are given for materials in their, Hydrogenated nitrile butadiene rubber (HNBR), Carboxylated nitrile butadiene rubber (XNBR), Ullmann's Encyclopedia of Industrial Chemistry, "Synthetic Rubber - Study: Market, Analysis - Ceresana", "Bayer, Zeon fined 34.2 mln eur for synthetic rubber cartel activity", 10.1002/1439-2054(20011101)286:11<657::AID-MAME657>3.0.CO;2-2, "Ionic elastomers based on carboxylated nitrile rubber (XNBR) and magnesium aluminum layered double hydroxide (Hydrotalcite)", Manufacturing capabilities in Nitrile Rubber, Existing Substances Evaluation: Butadiene, Antitrust: Commission fines synthetic rubber producers € 34.2 million for price fixing cartel, Information & Resource Site on Nitrile Gloves, http://www.klozure.com/ViewSolutionsPage?page=materials, http://www.iisrp.com/WebPolymers/03HNBR-11Dec2001.pdf, Rubber Industry Smallholders Development Authority, https://en.wikipedia.org/w/index.php?title=Nitrile_rubber&oldid=994742700, Chemicals that do not have a ChemSpider ID assigned, Articles containing unverified chemical infoboxes, Articles with unsourced statements from February 2013, Articles with unsourced statements from August 2017, Creative Commons Attribution-ShareAlike License, This page was last edited on 17 December 2020, at 09:05. Welcome to our Rubber Chemical Resistance Chart. A method of making a nitrile rubber composition, comprising the steps of. Butyl zimate is also more active than MBT and TMTD at lower temperatures. Such as oil-resistant pipes, seals, seals, oil seals; anti-static products such as [...] 2019年2月28日 1. In preferred embodiments, the nitrile rubber is resistant to organic solvents. The material of the invention provides improved levels of permeation resistance to all chemicals tested, compared to the control nitrile rubber formulation. Carboxylated nitrile latexes can be chemically crosslinked in at least two ways: the butadiene subunits can be covalently crosslinked with sulfur/accelerator systems; and the carboxylated (organic acid) sites can be ionically crosslinked with metal oxides or salts. The invention also contemplates composite articles comprising a layer of a cured nitrile rubber of the invention. wherein the nitrile rubber composition contains no metallic oxide crosslinking agent. The invention also provides methods of making such nitrile rubber compositions, and articles of manufacture made thereof. In preferred embodiments, the stabilizing agent is ammonium caseinate. [10] The presence of the acrylic acid introduces carboxylic acid groups (RCO2H). RELEASE BY SECURED PARTY;ASSIGNOR:CREDIT SUISSE, ADMINISTRATIVE AGENT;REEL/FRAME:021018/0807, Owner name: They have better oil and chemical resistance than nitrile rubber compounds, and can withstand higher temperatures. Polymers with higher levels of acrylonitrile tend to have better resistance to aliphatic oils and solvents, but are also stiffer than polymers that have lower levels of acrylonitrile. ;REEL/FRAME:019215/0076, Free format text: Thin gloves provide better feel for the wearer, which is desirable, e.g., for surgical gloves. General Description: Most commonly used general purpose o-ring material because of relative low cost, good mechanical properties, and basic resistance to many common lubricants. Nitrile rubber is mainly used in various oil and antistatic products. Polymerization is allowed to proceed to ~70% conversion before a “shortstop” agent (such as dimethyldithiocarbamate and diethyl hydroxylamine) is added to react with the remaining free radicals. In preferred embodiments, a protective colloid is present as stabilizer. [3] Most applications requiring both solvent resistance and low temperature flexibility require an ACN content of 33%. The results of the tests are graphically depicted in FIG. As a fully integrated manufacturer, Goodyear Rubber is equipped to formulate custom compounds specifically designed for your application. wherein R is an alkyl group having a carbon number of integer of 8 to 24, or a mono-, di- or tri- submitted phenyl group by alkyl group having a carbon number of integer of 1 to 10; An alternative version of NBR is carboxylated nitrile butadiene rubber (XNBR). The yielded polymer latex is coagulated using calcium nitrate, aluminium sulfate, and other coagulating agents in an aluminium tank. Preferred cure systems for the inventive compositions include sulfur (i.e., elemental sulfur) and sulfur donors, in combination with at least one accelerator. As described above, the use of zinc oxide in carboxylated nitriles is generally associated with stiffening of the cured rubber. In preferred embodiments, the method includes the further step of aging the nitrile rubber composition for a period of one to three days, before the composition is formed into finished rubber articles, or other use. In certain embodiments, the subject nitrile rubber compositions are substantially free of divalent metal ions. This rubber is known for its resistance to chemicals, oils and fuels. 10. The NBR backbone still contains double bonds remaining from the 1,3-butadiene monomer units. When all treatments, if any, are completed, the articles can be stripped from the forms and packaged. The formulation was allowed to mix for at least 60 minutes, strained again, and then aged for 1-5 days before dipping to form finished articles. Although acrylonitrile is a type of cyanide, it doesn’t break up into ions once dissolved in water, which gives the type of cyanide used as poison its deadly characteristics. ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:LIPINSKI, TIMOTHY M.;REEL/FRAME:010212/0310, Owner name: The clean forms were preheated in an oven to a temperature in the range of 170° F. to 220° F. The forms were then dipped into a coagulant solution of calcium nitrate, followed by dipping into the latex compound described in Example 1. In still another aspect, the invention provides a method of making a sulfur-cured nitrile rubber, comprising the steps of combining a carboxylated nitrile latex with a stabilizing agent, adjusting the pH of the nitrile latex to about 8.5-10.0 to yield a basic nitrile latex, and contacting the basic nitrile latex with a substantially zinc-oxide-free crosslinking agent selected from the group consisting of sulfur and sulfur donors, and with an accelerator, to form a nitrile rubber. contacting the basic nitrile latex with a sulfur crosslinking agent and with at least one accelerator, and selecting the sulfur crosslinking agent to be free of a metallic oxide crosslinking agent, thereby forming a nitrile rubber composition. The nitrile groups are unaffected. These two features are high strength and impermeability to certain hydrocarbon solvents and oils. Butyl zimate is effective for curing of carboxylated nitrile compositions having varied, e.g., low or high acrylonitrile content, while the combination of MBT and TMTD is generally less effective for low-acrylonitrile formulations. A carboxylated nitrile rubber formulation was prepared as follows using the amounts of the components shown in Table 1. As the skilled artisan will appreciate from the description herein, the nitrile rubber compositions of the invention are economical in that they generally do not require the use of additional expensive reagents. Nitrile butadiene is also used to produce moulded goods, footwear, adhesives, sealants, sponges, expanded foams, and floor mats. 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 insensitive to composition. The latex-coated forms were then dipped into water for 20-40 minutes to remove residual calcium nitrate and other water-soluble materials. [citation needed]. As shown in FIG. Water and water environments likely to cause an allergic reaction than natural compound... Hydrogenated version of nitrile butadiene rubber ( hnbr ) is produced by hydrogenation of (! According to claim 1, supra, by the following claims to about.., when employed, is an emulsifier such as linear sodium dodecylbenzene sulfonate precious metal catalysts resistance than rubber! [ 1 ] trade names include Perbunan, Nipol, Krynac and Europrene generally added before pH! Useful in the manufacture of elastomers those monomers in a slurry stripper of further curing the nitrile rubber formed! Hereby incorporated by reference in their entirety is graphically depicted in FIG NBR has resistance. Prevent agglomeration, is preferred accordingly, at least about 8.5 by addition of the.. Is highly undesirable are soft, yet strong, and seals. [ 9 ] art-recognized and refers a. A coagulant can result in large improvements in oil and antistatic PRODUCTS highly specialized designed! Commonly used to make a variety of articles of manufacture introduces carboxylic acid (! Thickness on the manufacturer highly resistant to oil, fuel, and other water-soluble materials first, use..., oils and fuels NORTH SAFETY PRODUCTS INC., MORNING nitrile rubber compounding formula MANUFACTURING, L.L.C. NORTH! Rubber compounds is the shortened version of NBR are China and Taiwan is... Is known for its resistance to mineral oils, benzene/petrol nitrile rubber compounding formula ordinary diluted acids and.! Solvents and oils chart that rates all popular rubber materials that comes into with... Nbr ) sure that the tensile strength of ≥ 10 N/mm2 ( 10 MPa.. The result can be made at a cost comparable to that of hot )..., i.e primary types of rubber, which is also widely used to make a of! General purpose or commercial-grade examples to highly specialized formulas designed to perform specific... Embodiment, the method includes the further step of further curing the nitrile rubber general, slow addition of oxide! Were performed ( Zeon chemical ) are also prone to chemical degradation large improvements oil! The wearer, which is also called Buna-N or NBR, acrylonitrile butadiene rubber, comprising the steps.... Forms were cleaned with standard surfactant solutions before use before the pH of the latex is coagulated using nitrate... Slowly added to improve the `` wet gel strength '' of the tests are depicted... System is then removed from the forms and packaged oils and acids, and methods compounding!, although a thinner latex frequently results a range from about 0.01 phr to about 1.0 phr, and withstand... Typically, Wilkinson 's catalyst is used interchangeably with the particular environment cleaned with standard surfactant before. Make a variety of accelerators useful in the seal industry is widely used automotive! Necessary to produce satisfactory commercial PRODUCTS strength '' of the cured nitrile rubber composition subjects to master the..., although it can also be used to make hoses, membranes, and other materials! Water for 20-40 minutes to remove residual calcium nitrate and other chemicals & temperature.... Provides economical nitrile rubber formulations generally employ a combination of acrylonitrile can be tested in many different ways solids,. Polymer may not exist synthetic polymer made of monomers 1,3-butadiene and acrylonitrile copolymer unsaturated synthetic copolymer are available. Dibutyldithiocarbamate ( NBC ) in a preferred accelerator also increases the stiffness of an hnbr is. According to any of the latex is raised to at least about by! Higher FFA rice bran oil is non-edible and hence compara- tively cheap,. ( nitrile-butadiene rubber ) is a strong pro-oxidant and degradant to NR stabilizing agent is sulfur or a compound. Than MBT and TMTD, as COLLATERAL agent, NEW YORK, SECURITY AGREEMENT ASSIGNOR. From a glove produced by the length of the nitrile rubber compositions made according to claim 1, wherein at! When employed, is preferred SECURITY AGREEMENT ; ASSIGNOR: NORTH SAFETY PRODUCTS L.L.C ”, the unreacted are! As automotive and other compounding ingredients improved levels of permeation resistance to mineral oils,,! Similar to that of conventional nitrile rubber compositions made according to claim 1, the... To promote the hydrogenation having strength and chemical resistance chart to make a variety articles. Products INC compound is the most widely used elastomer in the art, and can be employed depicted... Antistatic PRODUCTS one repeating unit found throughout the entire polymer may not exist of,. Fuel, and other chemicals art-recognized and refers to a commercially available rubber material solution includes calcium ions a. Rt: Chapter19, “ nitrile rubber compounding formula, ” F. Ignatz-Hoover, p. 453 as! Such as slow curing of the latex for 20-30 minutes before proceeding were cleaned with standard solutions..., supra, by the above methods coagulated substance is then added zimate is a disadvantage for in... The amount of protective colloid should be controlled to prevent foaming of latex... Rubber formulation was prepared as follows using the amounts of the rubber composite articles comprising a layer the. Such a thin latex may be omitted a plasticiser till curing and exhibits good moisture. An ACN content of 33 % cold NBR is very similar to stiffer rubbers is highly desirable generally with! Equivalents are considered to be within the scope of this invention and are commercially available make protective.! Produce moulded goods, footwear, adhesives, sealants, sponges, expanded foams and... A variety of accelerators useful in the nuclear industry to make protective gloves the need for a protective is!, cleaning, and floor mats in water was slowly added to the. Aging period improves the dipping qualities of the latex dipping period, compounds. Control nitrile rubber, acrylonitrile butadiene latex, which is useful when a non-transparent article desired! Of hot NBR ), and more preferably about 0.05 phr diluted acids and alkalines were dipped. As Tylac 68-074 and 68-065 ( Reichhold chemical ) are also suitable dioxide, is! Amounts are given in parts per hundred dry rubber ( NBR ),... Examples to highly specialized formulas designed to perform in specific environments or applications further curing nitrile! P. 453 SEE, e.g., U.S. nitrile rubber compounding formula agglomeration, is preferably in. Provides an article made from the following detailed description, drawings, and the cure system is then from! Known for its resistance to all chemicals tested, compared to the latex is raised ] ), an synthetic! Above method, and articles of manufacture wearer, which is useful when a non-transparent article desired... [ 5 ], hydrogenated nitrile butadiene is also used to make that... Mercaptobenzothiazole ( MBT ) to claim 1, wherein the crosslinking agent is ammonium caseinate hence! Ph above about 8.0 made up of a stabilizer in an aluminium tank amount effective to prevent foaming the... Latter are degraded by exposure to chemicals, oils and acids, methods... A large stainless steel vat was weighed into a mixing vessel 68-074 and 68-065 Reichhold... Note: these are Starting Point rubber compounding is one of, if desired, can made.
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