Research in Synthetic Rubber
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The Difference of Butyl Rubber and Butadiene Styrene Rubber? by Butyl Rubber Sheets - [email protected], Date: Sep.18.06
The difference of butyl rubber and butadiene styrene rubber? By Butyl Rubber Sheets - www.dongrubber.com, [email protected], Date: Sep.18.06 Butyl rubber sheets is a kind of synthetic rubber which is a copolymer of Isobutylene and a small amount of isoprene copolymer, short for IIR. Butyl rubber sheeting has good chemical stability and thermal stability, the most prominent character is the air tightness and water tightness. Its air transmittance is only about 1/7 of the natural rubber, 1/5 of the styrene-butadiene rubber. Meanwhile its transmittance of steam is 1/200 of the natural rubber, and 1/140 of the styrene-butadiene rubber. Thus IIR is mainly used in the manufacture of tires, inner tubes, steam pipe, water dam and bottom gasket and other rubber products. Styrene-butadiene rubber (SBR) is one of the biggest general synthetic rubber varieties, and is also among the first rubber to realize industrialization production. Styrene butadiene rubber sheet is a random copolymer of butadiene and styrene. Its physical performance, processing performance and product performance is close to those of natural rubber sheets, and some properties such as wear resistance, heat resistance, ageing resistance and curing rate are more excellent than natural rubber sheeting, SBR can be used with a variety of natural rubber sheets and synthetic rubbers, widely applied to tires, tape, rubber hose, wire and cable, medical instruments and various kinds of rubber products production and other fields. Author: Butyl Rubber Sheets copyright reserved. Original URL should be kept in reproduction. . -
Vulcanization & Accelerators
Vulcanization & Accelerators Vulcanization is a cross linking process in which individual molecules of rubber (polymer) are converted into a three dimensional network of interconnected (polymer) chains through chemical cross links(of sulfur). The vulcanization process was discovered in 1839 and the individuals responsible for this discovery were Charles Goodyear in USA and Thomas Hancock in England. Both discovered the use of Sulfur and White Lead as a vulcanization system for Natural Rubber. This discovery was a major technological breakthrough for the advancement of the world economy. Vulcanization of rubbers by sulfur alone is an extremely slow and inefficient process. The chemical reaction between sulfur and the Rubber Hydrocarbon occurs mainly at the C = C (double bonds) and each crosslink requires 40 to 55 sulphur atoms (in the absence of accelerator). The process takes around 6 hours at 140°C for completion, which is uneconomical by any production standards. The vulcanizates thus produced are extremely prone to oxidative degradation and do not possess adequate mechanical properties for practical rubber applications. These limitations were overcome through inventions of accelerators which subsequently became a part of rubber compounding formulations as well as subjects of further R&D. Following is the summary of events which led to the progress of ‘Accelerated Sulfur Vulcanization'. Event Year Progress - Discovery of Sulfur Vulcanization: Charles Goodyear. 1839 Vulcanizing Agent - Use of ammonia & aliphatic ammonium derivatives: Rowley. 1881 Acceleration need - Use of aniline as accelerator in USA & Germany: Oenslager. 1906 Accelerated Cure - Use of Piperidine accelerator- Germany. 1911 New Molecules - Use of aldehyde-amine & HMT as accelerators in USA & UK 1914-15 Amine Accelerators - Use of Zn-Alkyl Xanthates accelerators in Russia. -
SAFETY DATA SHEET for Mission Rubber Neoprene Gaskets
SAFETY DATA SHEET for Mission Rubber Neoprene Gaskets SECTION TOPIC PG 1 Identification 1 2 Hazard Identification 1-2 3 Composition/Information On Ingredients 2 4 First Aid Measures 2 5 Firefighting Measures 2 6 Accidental Release Measures 3 7 Handling and Storage 3 8 Exposure Controls/Personal Protection 3 9 Physical and Chemical Properties 4 10 Stability and Reactivity 4 11 Toxicological Information 4 12 Ecological Information 5 13 Disposal Considerations 5 14 Exposure Controls/Personal Protection 5 15 Regulatory Information 5-6 16 Other Information 6 missionrubber.com (800) 854-9991 SAFETY DATA SHEET NEOPRENE GASKETS Section 1: IDENTIFICATION 1.1 Product identifier Product name: Neoprene Product part number: DPESISGRP251 CAS number: Ingredients: 184963-09-1. Synonyms: Neoprene. Product description: Neoprene Synthetic Rubber Gasket is a black color rubber with a mild characteristic odor. Product type: Solid 1.2 Relevant identified uses of the substance or mixture and uses advised against Product use: For use only as specified in product literature 1.3 Details of the supplier of the safety data sheet Mission Rubber Company, LLC 1660 Lesson Lane Corona, CA 92879 1.4 Telephone number: 800-854-9991 Section 2: HAZARD IDENTIFICATION 2.1 Classification of Substance or Mixture Potential Health Effects Before using Neoprene Synthetic Rubbers, read Bulletin "Guide for Safety in Handling and FDA Status of Neoprene Solid Polymers". ADDITIONAL HEALTH EFFECTS POLYCHLOROPRENE BLEND ACUTE OR IMMEDIATE EFFECTS: ROUTES OF ENTRY AND SYMPTOMS Ingestion One type of Neoprene was tested for oral toxicity in rats. The LD-50 is in excess of 20,000 milligrams per kilogram body weight which is low toxicity. -
Mechanical Study Guide.Pdf
MECHANICAL CONCEPTS Turn on bookmarks to navigate this document . PURPOSE OF THIS GUIDE . BEARINGS . Michelin North America, Inc. Copyright © 2012 Michelin North America, Inc All rights reserved. The Michelin Man is a registered trademark of Michelin North America, Inc. www.michelin.com BEARINGS AND THEIR CATEGORIES Generalities A bearing is a mechanical device and it is important to know its various components. 1 2 Figure 1-1 . Michelin North America, Inc. Copyright © 2012 Michelin North America, Inc All rights reserved. The Michelin Man is a registered trademark of Michelin North America, Inc. www.michelin.com Categories of bearings Figure 1-2 . Michelin North America, Inc. Copyright © 2012 Michelin North America, Inc All rights reserved. The Michelin Man is a registered trademark of Michelin North America, Inc. www.michelin.com Radial bearings Radial bearings are made with balls or rollers, depending on the how the bearings are used. They are designed to withstand forces that are perpendicular to the axis of the shaft. Figure 1-3 Axial bearings Axial bearings, also known as thrust bearings, have either balls or rollers, but both are designed to withstand axial forces, which push or pull along the axis. Figure 1-4 . Michelin North America, Inc. Copyright © 2012 Michelin North America, Inc All rights reserved. The Michelin Man is a registered trademark of Michelin North America, Inc. www.michelin.com Radial bearings and their functions Ball bearings Name Function Rigid, with balls and Designed mainly to support deep track. radial loads, but can also take a bit of axial load. Name Function With filling notch. -
United States Patent (19) (11) 4,161,455 Wason 45) Jul
United States Patent (19) (11) 4,161,455 Wason 45) Jul. 17, 1979 (54) NOVEL PRECIPITATED SILICEOUS 57 ABSTRACT PRODUCTS AND METHODS FORTHER A method for producing a precipitated silicon dioxide USE AND PRODUCTION having a new combination of physical and chemical Satish K. Wason, Havre de Grace, properties is disclosed. The pigments are produced by 75 Inventor: acidulating a solution of an alkali metal silicate with an Md. acid under controlled precipitation conditions. The 73) Assignee: J. M. Huber Corporation, Locust, aqueous reaction medium comprising the precipitated N.J. silica is then post-conditioned by introducing a second silicate solution into the reaction vessel and thereafter 21) Appl. No.: 911,003 adding additional acid to react with the said second 22 Filed: May 30, 1978 silicate solution. By varying the amount of the silicate employed in the post-conditioning step, a product is Related U.S. Application Data obtained which has a unique combination of physical and chemical properties including reduced wet cake 60) Continuation of Ser. No. 796,913, is a division of Ser. moisture content, high surface areas and oil absorptions, No. 557,707, Mar. 12, 1975, abandoned. improved surface activity, friability, wetting character (51) Int. Cl’............................................... C11D 3/08 istics, and the like. The product has particular utility for (52) U.S. C. ............................... 252/174.25; 252/135; use as a rubber reinforcing agent because of its in 252/140; 106/288 B; 423/339 creased surface activity and oil absorption, etc. The (58) Field of Search ......................... 252/89, 135, 140; product, however, may be used in paints, paper, deter 423/339; 106/288B gents, dentifrice compositions, molecular sieves, and polymeric compositions. -
TECH Tire Repair Chemicals for Best Results, Tech Nail Hole Repairs Should Be Used with These Tech Chemical Products
epair orld Leader in Tire R The W TECH INTERNATIONAL TIRE REPAIR CATALOG www.techtirerepairs.com TRUST TECH Table of Contents TIRE REPAIR PRODUCTS & REPAIR CHARTS Pages 3 – 25 Uni-Seal Ultra Repairs . 3 – 4 Uni-Seal 2-piece Stems & Repairs . 5 – 7 Centech Radial Repairs for Shoulder Injuries . 6 Radial Section Repairs . 8 – 10 Bias Ply Tire Repairs. 11 – 13 Radial OTR Repairs . 14 – 18 Tech Off Road (TOR) Bias Repairs . 19 – 21 Repair Rubber and Chemicals . 22 – 24 2-Way Tube Repairs & All-Purpose Repairs. 25 NAILHOLE INSERTS & REPAIR KITS Pages 26 – 28 Permacure Repairs & Kits . 26 Flow-Seal Inserts & Self-Vulcanizing Repairs . 27 Repair Kits . 28 CABINETS & REPAIR TOOLS Pages 29 – 31 Cabinets & Tool Stations. 29 Hand Tools and Knives, Extruder Guns . 30 – 31 & Branding Irons PRODUCT PAGES Pages 32 – 33 Tire Inspection & Marking Tools . 32 – 33 Anti-Seize Compound. 33 SAFETY, PROTECTION & HAND CLEANING PRODUCTS Page 34 AIR TOOLS & ACCESSORIES Pages 35 – 41 Drills, Buffers & Air Hammers . 35 Cutters, Burrs, Grinding Stones, Wheels & Rasps . 36 – 39, 41 Wire Brushes, Buffing Stones. 40 Gouges & Cut-Off Wheels . 41 MONAFLEX VULCANIZING EQUIPMENT & SPOTTERS Pages 42 – 47 TIRE & WHEEL SERVICE LUBRICANTS Pages 48 – 49 TIRE IDENTIFICATION Page 50 Radio Frequency Identification Data Tags (RFID) . 50 Tire Identification Logos . 50 TIRE SPREADERS Page 51 Tech International Tire Repair Catalog TIRE BALANCING & SEALANT PRODUCTS Pages 52 – 53 Balance Pads, Tools & Chemicals . 52 Balancing Compound & Tire Sealant . 53 TPMS SOLUTIONS Pages 54 – 57 VALVES & VALVE HARDWARE Pages 58 – 73 AIR SERVICE PRODUCTS Pages 74 – 78 Gauges . 74 Automatic Tire Inflators. 76 Chucks & Chuck Repair Kits. -
BIOMIMETIC SYNTHETIC RUBBER Better Than Natural Rubber
Better than natural rubber BISYKA BIOMIMETIC SYNTHETIC RUBBER 30 % less FRAUNHOFER abrasion EXPERTISE Elastomers Superior Life sciences roll resistance Silica fillers Scale up Can be produced in existing plants THE FRAUNHOFER-GESELLSCHAFT ABOUT THE FRAUNHOFER-GESELLSCHAFT The Fraunhofer-Gesellschaft is contract research, 70 percent of Europe’s leading organization which is through contracts with in applied research. It is made up of industry and with publicly financed 72 institutes and research facilities research projects. International collab- located throughout Germany. More oration with outstanding research than 26,600 employees generate partners and innovative companies an annual research volume of more worldwide provides direct access than 2.5 billion euros. Of this, more to major scientific and economic than 2.1 billion euros come from regions now and into the future. www.fraunhofer.de/en 2 CONTENT On behalf of the Fraunhofer-Gesellschaft, 4 Why is rubber so important for the auto- I would like to congratulate the BISYKA motive industry? Fraunhofer’s project on consortium on its excellent outcomes in the field biomimetic synthetic rubber of biomimetic synthetic rubber. “BISYKA” 6 What makes natural rubber so unique? Within the framework of MAVO, 8 Understanding Fraunhofer’s internal research program for dandelion rubber market-oriented preliminary research, Biocomponents enable innovative elastomers the Fraunhofer-Gesellschaft bundles the 12 From natural rubber expertise of various institutes into original to biomimetic preliminary research projects. synthetic rubber Synthesis of BISYKA rubber BISYKA is an excellent example of how on a pilot scale synergies can be used effectively in this way 16 Novel silica fillers for the rubber and tire industry to develop new and original solutions. -
Lehigh Technologies
CONFIDENTIAL “Technology and Innovation in the use of Micronized Rubber Powder in today’s Green World” 11 April, 2013 CONFIDENTIAL • Setting the Stage and What we are Learning • Who is Lehigh Technologies • Technical Presentation • What Does it All Mean in Terms of Green? 1 | Lehigh Technologies Inc. Millions of End-of-Life Tires Generated Each Year Energy Recovery Civil Engineering Landfill Stockpiled Data Not Available 292 250 112 80 30 2 | Lehigh Technologies Inc. 2 CONFIDENTIAL The First Chemical Revolution 1800s 1850-1900 1900-1930 dyes/pigments oil and gas cracking/refining discoveries metals synthetic chemistry carbohydrates soaps atomic theory and the chemical bond 3 | Lehigh Technologies Inc. 3 The World Today – 3 Challenges 4lbs /person/day oil prices over $80 world population and spiking to 7B people >$100/bbl over 200 million tons per year 1 billion in the borrow-buy-burn developed world is US energy consume as much strategy energy as the other 6B. 4 | Lehigh Technologies Inc. 4 The Second Chemical Revolution Bury or burn is not a solution infinite cycles of Vast resource pools available use • Huge technology challenge • • sustainable Must be waste based. production of Amyris, Kior, Renmatix, Genomatica building blocks • Small companies leading • • efficient use of Principles of Green Chemistry existing carbon Chemical companies leading sources • • 5 | Lehigh Technologies Inc. 5 Micronized Rubber Powder Industry – Lehigh Experience Image of industry: Reliability of supply-process safety; quality Scale-not capable of supporting -
Toyo Tire Talk
TOYO TIRE TALK Subject: Rubber Compound ··· Polymers As you will all know well, a tire is mainly made of "rubber" and cords. In the past, we have talked about the important functions of cords. Therefore, this time we would like to talk about the most important material in tires "rubber". When we talk about rubber, we generally mean the rubber compound to be exact. The compound is made by mixing polymer, reinforcement material, softener and various chemicals. Different characteristics are required for every type of tire or tire part. For example, a TBR tire requires heat, wear and cut resistance for the tread rubber, while the sidewall requires good weather resistance. We therefore need many kinds of rubber compounds. In this chapter, we'll talk about polymers, their types, characteristics and uses, that all perform very important functions. The main polymers used for tires are as follows : 1) Natural Rubber (NR) 2) Styrene Butadiene Rubber (SBR) 3) Butadiene Rubber (BR) 4) Isoprene Rubber (IR) 5) Halogenated Butyl Rubber All of the above are synthetic rubber except Natural Rubber of course. 1) Natural Rubber (NR) Characteristics NR is made from latex taken from rubber Advantage Disadvantage trees, mainly grown in Southeast Asia. Tear Strength Uniformity of quality Although there are now various kinds of Wear Resistance Aging Resistance synthetic rubber available, Natural Rubber Impact Resilience Fatigue Resistance is still used extensively in tires. Low Heat Generation Ozone Resistance 2) Styrene Butadiene Rubber (SBR) Characteristics SBR is now the most common synthetic Advantage Disadvantage rubber being used in tires. It is made by Processability Impact Resilience polymerizing Styrene and Butadiene Uniform quality Heat Generation together, it is also possible by changing Aging by heat Styrene content and polymerization process Frictional Force to make various types of SBR's with different characteristics. -
Modern Rubber Chemicals, Compounds and Rubber Goods Technology
MODERN RUBBER CHEMICALS, COMPOUNDS AND RUBBER GOODS TECHNOLOGY Click to enlarge DescriptionAdditional ImagesReviews (0)Related Books The book covers Natural Rubber, Basic Concepts of Synthetic Rubber, Styrene Butadiene Rubber, Polybutadiene, Polychloroprene and Polyisoprene Rubbers, Butyl and Nitrile Rubber, Miscellaneous Rubbers, Latex Product Manufacturing Technology, Foam Products Manufacturing Technology, Plasticisers, Factice and Blowing Agents, Moulding and Finishing of Rubber Components, Compounding Ingredients and Compound Design, Footwear Technology, Conveyor Belt Technology, V-Belt and Fan Belt Manufacturing Technology, Hose Technology, Rubber Sports Goods Manufacturing Technology, Cable Technology, Rubber-To-Metal Bonding Components, Rubber-Covered Rolls, Sealing Technology, Nitrile Rubber and Its Application in Construction Industry, Rubber-Resin Pressure Sensitive Adhesive Tape Technology, Test Methods in Rubber Industry, Recycling of Wastes from Rubbers and Plastics. MODERN RUBBER CHEMICALS, COMPOUNDS AND RUBBER GOODS TECHNOLOGY NATURAL RUBBER Introduction Sources and the Plantation Economy Tapping of Natural Rubber (NR) Latex Recovery of Natural Rubber from Latex Coagulation, Processing of the Coagulate, Sheets, and Crepe Smoked Sheets Pale Crepe Special Grades Oil Extended Natural Rubber (OE-NR) Deproteinated Natural Rubber (DP/NR) Heveaplus MG Grades Epoxidised Natural Rubber (ENR) Thermoplastic NR Depolymerised NR Powdered or Particulate NR Peptised NR Classification of Hevea Rubber (TSR) Technically Classified NR (TC) -
Synthetic Rubber Outperforms Natural Rubber 1 April 2019
Synthetic rubber outperforms natural rubber 1 April 2019 rubber tree, the fungus Microcyclusulei is laying waste to whole plantations. If the fungus crosses over to Asia, where major cultivation areas are located today, the global production of rubber will be threatened. Biomimetic synthetic rubber with optimized abrasion behavior (BISYKA) In view of this threat, researchers at the Fraunhofer Institutes for Applied Polymer Re-search IAP, for Microstructure of Materials and Systems IMWS, for Molecular Biology and Applied Ecology IME, for Mechanics of Materials IWM and for Silicate Research ISC have now optimized the characteristics of synthetic rubber. "Our synthetic rubber BISYKA – that's a German abbreviation for Initial testing of tires made from the nature-identical, "biomimetic synthetic rubber" – actually has biomimetic synthetic rubber BISYKA shows that they superior characteristics to natural rubber," says Dr. achieve around 30 to 50 percent less abrasion compared to natural rubber tires. Credit: Fraunhofer Ulrich Wendler, who heads up the project at the IAP/Till Budde Fraunhofer Pilot Plant Center for Polymer Synthesis and Processing PAZ in the German municipality of Schkopau. Fraunhofer PAZ is a joint initiative be-tween Fraunhofer IAP and Fraunhofer Natural rubber from rubber trees is a raw material IMWS. "Tires made of the synthetic rubber lose 30 with a limited supply. Synthetically produced percent less mass than equivalent tires made of rubber, on the other hand, has not yet been able to natural rubber. On top of that, the synthetic tires match the abrasion behavior of the natural product, have only half the tread loss. Furthermore, the rendering it unsuitable for truck tires. -
Polymer Chemistry Sem-6, Dse-B3 Part-3, Ppt-3
POLYMER CHEMISTRY SEM-6, DSE-B3 PART-3, PPT-3 Dr. Kalyan Kumar Mandal Associate Professor St. Paul’s C. M. College Kolkata Polymer Chemistry Part-3 Contents • Styrene Based Copolymers • Poly(Vinyl Chloride): A Thermoplastic Polymer Styrene Based Copolymers Styrene-Acrylonitrile (SAN) Copolymers and ABS Resins • To obtain a styrene-based polymer of higher impact strength and higher heat distortion temperature at the same time, styrene is copolymerized with 20-30% acrylonitrile. Such copolymers have better chemical and solvent resistance, and much better resistance to stress cracking and crazing while retaining the transparency of the homopolymer at the same time. In many respects SAN copolymers are also better than poly(methyl methacrylate) and cellulose acetate, two other transparent thermoplastics. • ABS resins are terpolymers of acrylonitrile, butadiene and styrene, prepared by interpolymerization (grafting) of styrene and acrylonitrile on polybutadiene or through blending of SAN copolymers with butadiene–acrylonitrile (Nitrile) rubber. Impact improvement is far better if the rubber in the blend is lightly cross-linked. The impact resistance of ABS resins may be as high as 6-7 ft lb. per inch of notch. This Lecture is prepared by Dr. K. K. Mandal, SPCMC, Kolkata Styrene-Acrylonitrile (SAN) Copolymers • Styrene acrylonitrile resin is a copolymer plastic consisting of styrene (Ph-CH=CH2) and acrylonitrile (CH2=CH-CN). It is also known as SAN. It is widely used in place of polystyrene owing to its greater thermal resistance. • The chains of between 70 and 80% by weight styrene and 20 to 30% acrylonitrile. Larger acrylonitrile content improves mechanical properties and chemical resistance, but also adds a yellow tint to the normally transparent plastic.