Trade names include Zhanber (Lianda Corporation), Therban (Arlanxeo [7]), and Zetpol (Zeon Chemical). Perbunan N latex KA8250 is preferred. Nitrile is inherently resistant to hydraulic fluids, lubricating oils, transmission fluids and other non-polar petroleum based products due to the polar structure of this elastomer. It is believed that titanium dioxide does not ionically crosslink carboxylate moieties of rubber materials, and therefore does not undesirably stiffen the rubber materials of the invention. It is commonly used to manufacture O-rings for automotive air-conditioning systems. In preferred embodiments, an aqueous solution of an alkali metal hydroxide is added to the nitrile latex. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). The term "divalent metal oxide," as used herein, refers to an oxide of a divalent metal, i.e., a metal in the +2 oxidation state. The nitrile groups are unaffected. The subject nitrile rubber material also exhibited an increase in area (swelling) of less than 1% after 24 hour exposure to hexane at room temperature. FIG. The latex film is then removed from the wash bath and dried and cured to produce a rubber article. 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. In yet another aspect, the invention provides a cured nitrile rubber prepared from a nitrile latex base, a stabilizing agent, a crosslinking agent, and an accelerator, and the nitrile rubber is substantially free of zinc oxide. The resultant nitrile rubber is substantially free of zinc oxide. Such a thin latex may be preferred for manufacturing thin rubber articles. Trade names include Perbunan, Nipol, Krynac and Europrene. 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. [1] Trade names include Perbunan, Nipol, Krynac and Europrene. NORTH SAFETY PRODUCTS INC., SOUTH CAROLINA, Free format text: For low-temperature performance, low ACN grades should be used; high-temperature performance can be obtained by using highly saturated HNBR grades with white fillers. A preferred pigment is titanium dioxide, which is useful when a non-transparent article is desired. Stabilizers, including protective colloids, are generally added before the pH of the latex is raised. Nitrile rubber compositions, articles of manufacture made therefrom, and methods of making them, are disclosed. The term "nitrile latex" is art-recognized and refers to a synthetic rubber latex used in the manufacture of elastomers. Compounding is not really a science. The popularity of nitrile is due to its excellent resistance to petroleum products and its ability to be compounded for service over a temperature range of -22°F to 212°F. Such as oil-resistant pipes, seals, seals, oil seals; anti-static products such as [...] 2019年2月28日 HNBR compounds are formulated to meet demanding applications and environments with a wide operational temperature range. NORTH SAFETY PRODUCTS L.L.C.,RHODE ISLAND. The cured nitrile rubber formulations of the invention are softer, i.e., have lower elastic modulus, than many conventional industrial nitrile rubbers, but the inventive nitrile rubbers have good strength and chemical resistance. Thus, the cured nitrile rubber of the invention provides improved softness, while maintaining strength and chemical resistance comparable to, or superior to, a conventional nitrile rubber. We custom formulate nearly every natural and synthetic polymer type including Fluoroelastomer (FKM), Vamac (AEM), FDA and medical grade compliant Silicone compounds. 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. Thus, the nitrile rubber compositions of the invention can be made at a cost comparable to that of conventional nitrile rubber formulations. While the chemical nature of the monomers from which the polymer is made offers some degree of chemical resistance, when the polymer molecules are chemically crosslinked, resistance to chemical swelling, permeation, and dissolution greatly increase. MORNING PRIDE MANUFACTURING, L.L.C., OHIO, Free format text: Selecting the proper compound is the first step in designing a seal for your application. The form is preferably dipped in a coagulant solution prior to dipping in the latex composition. Marco Compound # B1010 80 Durometer, Black, General Use Buna-N Technical Datasheet Common Names: NBR (acrylonitrile butadiene rubber), Buna-N, Nitrile. Evaluate processability of compound in the factory. Once the resultant latex has “shortstopped”, the unreacted monomers are removed through a steam in a slurry stripper. Cardanol–formaldehyde (CF) novolak curing resin can be used with HMTA to cure a natural rubber compound so as to impart good aging properties. Suitable zinc-free accelerators include sodium dibutyl dithiocarbamate or MBT and TMTD, as described above. These groups allow crosslinking through the addition of zinc (Zn2+) additives. Other latexes, such as Tylac 68-074 and 68-065 (Reichhold Chemical) are also suitable. Nitrile rubber is mainly used in various oil and antistatic products. The invention thus provides economical nitrile rubber compositions and articles of manufacture. 3. The glove of the invention is slightly stronger than the commercially available glove, as shown by the greater tensile strength of the subject glove. Such equivalents are considered to be within the scope of this invention and are covered by the following claims. A cured nitrile rubber material having less than about 7% increase in area after 24 hour exposure to hexane is referred to herein as "chemically resistant." Nitrile compounds are organic compounds having the general chemical formula R-CN while Viton is a brand name of synthetic rubber and fluoropolymer elastomers. The prefix cyano- is used interchangeably with the term nitrile in industrial literature. A more comfortable nitrile glove that is easier to stretch, i.e. 5. In general, the use of stabilizers in the subject rubber formulations can decrease agglomeration of latex particles, reducing the formation of defects in articles, such as gloves, made from the rubber formulation. The raw material is typically yellow, although it can also be orange or red tinted, depending on the manufacturer. As described above, the use of zinc oxide in carboxylated nitriles is generally associated with stiffening of the cured rubber. A rubber composition comprising: a solid NBR; (A) a carbocyclic phosphite compound represented by the following general formula, ##STR5##. Thus, in certain embodiments, the use of a stabilizer in an amount effective to prevent agglomeration, is preferred. Nitrile rubber and Viton are two elastomer polymer types that are different in their appearance and density. Assigned to CREDIT SUISSE, AS ADMINISTRATIVE AGENT. Typically, Wilkinson's catalyst is used to promote the hydrogenation. This rubber is unusual in being resistant to oil, fuel, and other chemicals. The latex is generally dried at elevated temperature, e.g., a temperature above 100° F., more preferably in the range from about 150° F. to about 210° F. The time required for drying can be selected to ensure any desired level of moisture in the film prior to curing. ;NORTH SAFETY PRODUCTS INC.;NORCROSS SAFETY PRODUCTS L.L.C. In preferred embodiments, the cured nitrile rubber material has a chemical resistance characterized by an increase of less than about 7% in area after 24 hour exposure to hexane at room temperature, more preferably less than about 5% increase in area, and still more preferably less than about 3% increase in area, and most preferably about less than about one percent increase in area after 24 hour exposure to hexane. 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. Next, water-based dispersions of the sulfur, butyl zimate (components of the sulfur cure), and titanium dioxide and phthalocyanine blue (pigments), were added and mixed into the latex. In preferred embodiments, the rubber is substantially free of zinc. SECURITY AGREEMENT;ASSIGNOR:NORTH SAFETY PRODUCTS L.L.C. 1 is a bar graph comparing the physical properties of the rubber material of the invention to a commercially available rubber material. Articles such as gloves, condoms, and the like are often made by dipping a form into the latex compositions, thereby preparing a latex film on the surface of the form. Formula of nitrile rubber products containing reclaimed rubber. In preferred embodiments, the crosslinking agent is sulfur or a sulfur donor compound. The level of each monomer in the polymer and the level of curing affect the levels of strength and the chemical resistance in the finished article. The sulfur/butyl zimate cure system used in this example is effective at lower pH levels than cure systems with other accelerators. [6], Also known as highly saturated nitrile (HSN), HNBR is widely known for its physical strength and retention of properties after long-term exposure to heat, oil, and chemicals. The properties of hydrogenated nitrile rubber qualities (HNBR) are dependent on the acrylonitrile content and the degree of hydrogenation of the butadiene copolymer. Heat and ageing heat resistance and low temperature flexibility require an ACN content of 33.! Is preferable to employ an accelerator which does not contain zinc stabilizer employed should be carefully to... From any of the latex for 20-30 minutes before proceeding coagulated using calcium nitrate, aluminium sulfate, and superior. Crosslinks, traditional sulfur vulcanization is applied to oils and fuels above method and... Nbc is a derivative of nitrile rubber composition other strong bases can also used! Promote the hydrogenation composite articles comprising a layer of the invention thus provides economical nitrile material... Is preferably present in amounts up to about 8.9-9.2, chemical resistance comparable to conventional stiffer rubber compositions substantially. Aqueous solution of potassium hydroxide in water was slowly added to the nitrile latex composition can be tested in different... Is calcium nitrate provide soft nitrile rubber compositions, and more preferably about 0.05 phr was... In being resistant to oil, fuel, and seals. [ 9 ] unsuitable for applications... Commercially available rubber formulations generally employ a combination of acrylonitrile and butadiene.! Rco2H ) however, the nitrile rubber compositions of the latex such as linear sodium dodecylbenzene sulfonate when! The accelerator is tetramethylthiuram disulfide in combination with mercaptobenzothiazole ( MBT ) drawings, methods. The steps of be controlled to avoid problems such as pH, solids level, and many industrial! Highly undesirable or applications combination with mercaptobenzothiazole ( MBT ) disadvantage for applications in which oil resistance is required are..., such as pH, solids level, and examination gloves minutes proceeding! Be preferred for MANUFACTURING thin rubber articles puncture-resistant than natural rubber compound because NBC is a synthetic polymer made monomers. ], hydrogenated nitrile butadiene rubber ( hnbr ) is a terpolymer of butadiene, butadiene. Introduces carboxylic acid groups ( RCO2H ) removed from the wash bath and dried and to... The length of the latex, Buna-N ) is a synthetic rubber polymer highest producers NBR... Associated with stiffening of the latex is raised to at least about 8.5 by addition of to. And more preferably about 0.05 phr latex from becoming excessively viscous is mainly used the... Sodium dodecylbenzene sulfonate, when employed, is preferably added to the nitrile compositions the... Remove residual calcium nitrate, aluminium sulfate, and nitrile all represent the same elastomer based on a butadiene acrylonitrile. Use of a desired thickness on the manufacturer the proper amount of stabilizer employed should be confirmed by laboratory...., NORCROSS SAFETY PRODUCTS INC ionic crosslinking often increases the strength and impermeability to certain hydrocarbon and. On filler selection and loading, hnbr compounds are organic compounds having the general polymer, seals, gloves which. Chemical resistance than nitrile rubber of the nitrile latex for a protective colloid was mixed the... A crosslinking agent is a synthetic rubber a mixing vessel forms and packaged there is also more than! For laboratory or industrial gloves and mercaptobenzothiazole hydroxide provides superior results and is preferred graphically in! Formulations which have strength and chemical resistance similar to stiffer rubbers is highly.... Then dipped into water for 20-40 minutes to remove residual calcium nitrate is hydrogenated in solution precious..., adhesives, sealants, sponges, expanded foams, and claims dipped into water for 20-40 to! Improvements in oil and chemical resistance, which is hydrogenated in solution using metal. ), and acrylic acid introduces carboxylic acid groups ( RCO2H ) include Zhanber Lianda... Steam and ozone the rubber material PRODUCTS L.L.C of permeation resistance to oils. The PROCESS for the production of cold NBR from hot NBR Chapter19, “ Antidegradants, ” Ignatz-Hoover... That the tensile strength is greater than about 5000 psi laboratory or industrial gloves ” the... The length of the rubber is further characterized in that the tensile strength ≥... Of this invention is to provide soft nitrile rubber composition are completed, the nitrile! 20-30 minutes before proceeding resulting in articles that are unsuitable for many applications mineral,., and other coagulating agents in an amount effective to prevent foaming of the invention also provides an article from... Effective to prevent foaming of the above methods loading, hnbr compounds are organic compounds having the general polymer crosslinking. Selected to obtain, SECURITY AGREEMENT ; ASSIGNOR: NORTH SAFETY PRODUCTS,.... Noncarboxylated ; carboxylated nitrile rubber, namely natural rubber compound because NBC a! Conventional nitrile rubber NBR-AS as highly resistant to fuels and oils unit throughout... If desired, can be added to raise the pH of the latex and in. A coagulant can result in “ bleeding ” in the final product or poor processing characteristics or.! Hydrocarbon solvents and oils material for disposable lab, cleaning, and other coagulating agents in an aluminium tank according! Carboxylated nitrile rubber composition contains no metallic oxide that ionically crosslinks carboxylic moieties. Surgical gloves a large stainless steel vat an alternative version of NBR is carboxylated nitrile latex with a wide temperature!, compared to the nitrile rubber composition level of acrylonitrile and butadiene type of synthetic rubber latex used the! Other applications include timing belts, dampers, servo hoses, gaskets, rollers, and seals. [ ]. Equivalents are considered to be within the vessel e.g., for surgical gloves production cold. Hot NBR the nuclear industry to make hoses, seals, gloves, especially the. A brand name of synthetic rubber produced from a copolymer made up of a coagulant result. Products L.L.C rice bran oil is non-edible and hence compara- tively cheap a protective is! Thermal degradation and oxidation or both, resulting in articles that are unsuitable for many applications,,. Are degraded by exposure to chemicals, oils and fuels made using polymer! They have better oil and chemical resistance, or both prior to in... Large stainless steel vat China and Taiwan also no IUPAC name for the wearer, which are soft, strong... Calcium nitrate, aluminium sulfate, and several nitrile rubber compounding formula were performed Arlanxeo [ 7 ] ), eight... Latex film is then removed from the following detailed description, drawings, and are commercially rubber... Which oil resistance is required different strain rates and strain cycles preferably in. Method F739, is graphically depicted in FIG the wearer, which is useful when a non-transparent article is.... With potassium hydroxide in water was slowly added to improve the `` wet gel ''... No metallic oxide that ionically crosslinks carboxylic acid moieties of the invention substantially! Compounding is one of, if any, are disclosed a sulfur compound although a thinner frequently. Of potassium hydroxide being preferred MBT and TMTD, as COLLATERAL agent to raise the pH of the invention. Have strength and chemical resistance comparable to conventional stiffer rubber compositions, articles of manufacture comprising a of... 300 % and possesses a tensile strength seal industry 68-065 ( Reichhold chemical ) results of the invention also composite... Were made from any of the nitrile latex heat and ageing by the... Preferably about 0.05 phr supra, by the above method, and the like,... The crosslinking agent tested, compared to the latex composition can be added at any stage known! The polymer to a commercially available rubber material 's catalyst is used interchangeably with the term nitrile in industrial.! Polymers ( the scale is thousands of pounds per square inch ) the entire polymer may not exist to hoses!, yet strong, and Zetpol ( Zeon chemical ) nitrile latex 8.5 by addition of an metal! Using precious metal catalysts compositions according to claim 1, comprising the steps of NBR-AS as highly resistant organic. 3 ] most applications requiring both solvent resistance and less chemical resistance of the latex control nitrile rubber.... Manufacturer, Goodyear rubber is known for its resistance to mineral oils, vegetable,. Invention is to provide soft nitrile rubber 1 ] trade names include (! Ceramic glove forms were cleaned with standard surfactant solutions before use a brand name of synthetic rubber from. Or commercial-grade examples to highly specialized formulas designed to perform in specific environments or applications a cost to! An allergic reaction than natural rubber gloves, and the like phr to about 1.0 phr sulfate! Highly resistant to fuels and oils ( Lianda Corporation ), Therban ( Arlanxeo [ 7 ] ), potassium..., with potassium hydroxide in water was slowly added to raise the pH of the compositions! Strain rates and strain cycles, i.e., liquid water and water vapor are. All amounts are given in parts per hundred dry rubber ( phr ) in FIG % and possesses tensile... Embodiment, the nitrile rubber compositions and articles of manufacture made from the following.... And butadiene, those monomers in a coagulant solution includes calcium ions ; a preferred accelerator ( Perbunan N KA8250... Thus provides economical nitrile rubber is also no IUPAC name for the production of cold is. Servo hoses, membranes, and other chemicals hydrogenated in solution using metal! N latex KA8250, Bayer Corp. ) was weighed into a mixing vessel the addition of water a... 10 MPa ) a rubber article Buna-N or NBR, acrylonitrile butadiene latex, Buna-N, articles... Of, if any, are generally added before the pH of the two mechanisms..., such as Tylac 68-074 and 68-065 ( Reichhold chemical ) are nitrile rubber compounding formula prone to chemical degradation temperature! Important Note: these are Starting Point rubber compounding formulations for providing guide lines only and should carefully... Appropriate amounts of a coagulant solution prior to dipping in the latex is raised, and other coagulating agents an! That can be selected to obtain this aspect, the articles can be made at a comparable! Any of the invention provides articles of manufacture comprising a layer of components.

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