Testing of Rubber Processability and Dynamic Properties
Returning Spring 2014!
Time: 8:00 AM - 4:00 PM
Location: Akron Polymer Training Center, Akron, OH 44325-5404
Instructor: John Dick and John Sezna
This two-day course is designed to help rubber professionals such as rubber chemists, engineers, compounders, laboratory and production managers, and associates better understand the various methods available to measure rubber processing, dynamic properties, and the fundamental rheological principles on which these tests are based. John Dick will review what specific changes in rubber compound formulations will affect these measured processing properties, as well as the cured dynamic properties. The topics of Mooney viscosity and stress relaxation, the ocillating disk rheometer, and the moving die rheometer will be presented. The instructor will also discuss the use of the Rubber Process Analyzer to characterize raw rubber, predict downstream processability for mixed stocks, and measure curing characteristics. The use of the capillary rheometer in measuring rubber compounding processability will be reviewed. Students are encouraged to bring and discuss their unique processing problems.
Unit 1 - Fundamental Measurable Properties Affecting Factory Processability
- Review of viscosity, shear thinning, green strength, uncured elasticity, V/E ratio, tackiness, surface exudation, stickiness, surface lubricity and cure properties (time to scorch, ultimate state of cure, anaerobic heat aging, reversion, marching modulus and cure-blow balance).
- Relate to behavioral definitions of processability for Banbury mixing, milling, extrusion, bin storage stability, calendering, second step tire building, compression molding, transfer molding, injection molding and autoclave curing.
Unit 2 - Basic Overview of Rheology and Dynamic Properties
- Elasticity: definition, examples, calculations, applications
- Viscous Quality: definition, examples, calculations, applications
- Viscoelasticity: definition, examples, calculations, applications
- Sinusoidal Definition and Measurements: definition, examples, calculations, dynamic torque properties, S', S'', tan delta, applicatations
Unit 3 - Basic Overview of Rheology and Dynamic Properties PART II
- Dynamic modulus (G', G'', G*): definitions, examples, calculations, applications
- Dynamic viscosity (η',η'',η*): definitions, examples, calculations, applications
- Dynamic Compliance (j', j'', j*): definitions, examples, calculations, applications
- Dynamic modulus and compliance under extension or compression (E', E'', E*, D', D'', D*): definitions, examples, calculations, applications
- Dynamic Spring Rate Constant (K', K'', K*): definitions, examples, calculations, applications
- WLF Time-Temperature Superposition: definitions, examples, calculations, applications
Unit 4 - Curemeters, ODR, MDR and Mooney Viscosity
- Discussion of oscillating disc curemeter
- Discussion of the Moving Die Rheometer (MDR)
- MDR Design
- MDR Applications
- MDR Dynamic Properties and Applications
- Using dynamic properties to detect assignable causes of variation
- Mooney Viscosity description and applications
- Mooney Stress Relaxation description and applications
Unit 5 - Rubber Process Analyzer
- RPA Definition
- RPA comparative advantages
- Applications in raw rubber characterization and quality assurance
- Measuring raw rubber Avg. MW, MWD, Long Chain Branching and gel
- Testing Natural Rubber, SBR, BR, NBR, EPDM.
- RPA testing of quality of mix for Banbury batches using G', G'' and tan delta
- RPA measurements of effects from order of mix changes
- RPA measurements of time of oiling on Banbury batch properties
- RPA measurements of different phase mixing techniques
- Advantages of frequency sweeps vs. strain sweeps
- RPA ASTM Standard Methods, D6204, D6601 and D7050
- Advantages of low strain vs. high strain measurements relating to carbon black particle size vs. structure
- Using RPA G'' to measure effects of plasticizer oils on rubber compound processing and cured physical properties
- Using the S'' cure curve for better scorch detection
Unit 6 - Capillary Rheometry
- Definitions and illustrations
- Shear thinning profiles
- Comparison of different capillary rheometers
- Measuring die swell
- Bagley Correction
- Rabinowitsch Correction
- Extrudate appearance and melt fracture
- Comparison of Capillary Rheometer vs. RPA
- Applications of Capillary Rheometer in rubber mixing, extrusion, injection molding and calendering
Unit 7 - Rubber Compounding Techniques to Achieve Selected Dynamic Properties
- Effects of different raw elastomers on cured compound dynamic properties
- Effects of molecular structure of different polymers on glass transition temperature and resulting dynamic properties
- Comparison of rheology master curves and dynamic properties
- Effects of carbon black on compound dynamic properties
- Effects of oils on compound dynamic properties
- Effects of different curative packages on compound dynamic properties
Unit 8 - Applications of Rubber in Vibration Noise Harshness
- Rubber metal component design
- Natural resonance frequency
- Effects of mass and stiffness
- The function of rubber isolators
- The function of rubber dampers
- Specific designs
General Course Registration:
Download a Printable Registration Form [PDF].
Registration for a class is due three weeks prior to the scheduled class date.
All registrations must be guaranteed by check, a purchase order number or a credit card, otherwise the registration will not be processed. Checks should be made payable to: The Akron Polymer Training Center and must include a copy of your completed registration form. COURSE FEES ARE DUE PRIOR TO ATTENDING.
All registrations whether by phone, fax or mail will be confirmed and considered binding and subject to all cancellation policies. If you do not receive a confirmation prior to the class, please call The Akron Polymer Training Center to verify your registration.
Course fee includes classroom instruction, instructional materials, parking permits and refreshment breaks. Travel and hotel accommodations are not included.
ENROLLMENT IS LIMITED AND ON A FIRST-COME, FIRST-SERVE BASIS. EARLY REGISTRATION IS STRONGLY RECOMMENDED!
Visit our registration webpage to view our cancellation/withdrawal policies.