additives in innovation & product engineering of poly olefins pe swapa… · additives in...
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Additives In Innovation & Product Engineering of Poly Olefins
Swapan Dhara
Regional Technical Head-Africa, India & Middle East
LyondellBasell Industries
Fine Organics & Jayvee Org. Endowment Lecture , New Delhi
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Agenda
• Role of Additives
• Additives - Classifications
• Additives - Process
• Additives - Products
• Environment & Additives
• Conclusion
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Definition
Materials used as components to Protect & Modify
the end product properties , enable better Plastic
products with enhanced Performance , long Service
life and new Applications & Markets.
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Extending Beyond Polymer Protection
Additives can provide additional properties or effects beyond stabilisation
Phenolic AOs
Plasticisers
Organophosphites
UV AbsorbersAntifogging Stabilizers
Optical BrightenersSlip Agents
Light Stabilizers
AntimicrobialsAntistats
Colorants
Polymer Property Retention
Polymer Property Extension
End use Product Property Protection / Enhancement
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Types of Additives
• Process Chemicals
• Product Additives
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Process Chemicals
• Catalysts & Donors
• Process Support Chemicals, eg, Anti Static Agents
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Product Additives• Stabilizers • Lubricants• Plasticizers• Slip Additives• Fillers• Process Aids• Pigments• Speciality additives
- Dispersion & wetting agents- Polymers- Anti scratch - Oxygen absorbers- Vis breaking Agents- Nucleating & Clarifying agents- Blowing Agent
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Catalysts
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The internal donor determines the performance of the catalyst and the properties of the polyolefin
The internal donor determines the performance of the catalyst and the properties of the polyolefin
The external donor is used to fine tune the catalyst performance
The external donor is used to fine tune the catalyst performance
Catalyst Manufacturer
PP Manufacturer
Manufacture and use of catalysts
Polypropylene
Avant ZNCatalyst
InternalDonor
TiCl4
SupportExternalDonorTEAL
Propylene
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ZN - catalyst families Internal Donors
O OR
O OR O
O
R
R
R O
O
R
R
Ethyl Benzoate
O
OR
RO
OR
R
RR
Succinate
Phthalate
DietherCatalyst yieldMW distributionSelectivity rangeHydrogen responseOligomer contentMicro-tacticity
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Effect of catalyst internal donor
Commodity Specialty
Narrow MWD(Fibres, cast film, etc.)
Phthalate Diether
Broad MWD(BOPP, Pipe etc.)
Ethyl Benzoate Succinate
Polymerisation processCatalyst yieldHydrogen responseSelectivity range
Performance PropertiesMWDMicro-tacticityOligomer content
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ZN phthalate - applications
PP homopolymerGood control of MW and MWDGood processability
PP random copolymerVery good transparencyVery good glossGood mechanical property balance
PP impact copolymerHigh impactGood mechanicalproperty balance
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ZN diether - spunbond applications
Features
Narrow MWD
Excellent spinnability
Excellent drawdown performance
Reduced smoke generation
Fine denier
Higher tenacity
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ZN diether - impact copolymers
FeaturesVery high melt fluidity MFR 100Reactor Narrow MWDOdourless (No peroxide)Excellent stiffness- impactEasy processingLess warpage
ApplicationsAuto compound BumperInterior panelsThin wall injection mouldingImproved cycle time
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ZN succinate - general characteristics
Internal donor : SuccinateHigh iso-tacticityCapable of producing very broad MWDCan expand product capabilities of single stage reactors towards a bimodal rangeImproved stiffness/impact balance for copolymers
ApplicationsBOPPPipesInjection moulding
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ZN succinate - applications
High stiffness PP homopolymerThermoforming
Cast PP film
Injection moulding
High stiffness PP impact copolymerImproved balance of impact and stiffness
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ZN succinate - high stiffness Homo Polymer
FeaturesHigher Stiffness
Higher HDT
Better barrier properties
Easy processing
Applications - ThermoformingHigher stiffness : down-gauging
Higher HDT : hot fill applications
HIPS replacement
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ZN succinate - high stiffness Homo Polymer
Metallised CPP
Appliances
Cast PP filmStiffer lamination filmPackaging speed on FFS machine can be increasedMetallised film : Higher stiffness and better dyne retentionBetter barrier properties
Injection mouldingHigh stiffness without fillerHigh surface glossGood scratch resistance
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Adstif copolymer with succinate catalysts
FeaturesExcellent stiffness with good impactGood glossEasy processingFood contact
ApplicationsFurniture Can replace ternary blends of Homo + Copolymer + fillerImproved surface aestheticsBetter scratch resistanceAppliancesElectrical plugs etc.
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High Melt Strength PP as Additive : Examples
Thermoformed Foam PP
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Anti Static Agents
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Anti static Agents : Process & Product Additive
• Reduces static electricity generation when in – process dry polyolefinpowder transported pneumatically
• Used during polymerization / post polymerization – technology specific & dependant
• Used in Product formulation to impart antistatic / internal lubrication.
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Antistatic Agents : Mechanism Minimization of electrostatic charge and increasing surface conductivity
Basic Building Block• An additive layer
starts building up on the surface
• The anti static agent will attract moisture
• A conductive layer is established
• The antistatic performance is obtained when the additive concentration reaches a certain level
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Antistatic Agents - Examples Minimization of electrostatic charge and increasing surface conductivity
Short term antistatic effect Long term antistatic effect
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Nucleating & Clarifying Agents
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Nucleating & Clarifying Agents
• Nucleating Agents are generic materials - Homogeneous nucleation - Heterogeneous nucleation
• Clarifying Agents- Organic nucleating agents which are soluble in the
polymer matrix
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Nucleation/ Clarifying Mechanism- An Illustration
Polymer meltPartially Crystallised
Fully Crystallised
Non - Nucleated
Nucleated
Clarified
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Clarifying Agents
Ist Generation : Dibenzylidene Sorbitol ( DBS)2nd Generation : p-Methyl Dibenziline Sorbitol ( MDBS )3rd Generation : 3,4-dimethyl dibenzilidine sorbitol ( 3,4-DMDBS)4th Generation : 1,2,3-trideoxy-4,6.5,7-bis-O- 4-(propyl phenyl)methylene –nonitol –
a di benzylidine nonitol
Generation Product Max Use Temp.
Advantages Drawbacks
1G DBS 225 DegC Food contact Poor Clarity, Heat Stability
2G MDBS 250 DegC Clarity, Nucleation Taste Odor
3G Millad®3988i
285 DegC Clarity, Nucleation, Food Contact, Heat Stability
Suitable for ALL applications
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Slip & Antiblock Agents
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Slip Additives Reduction of coefficient of friction ( COF )
Examples
Basic Building Block
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Slip Additives - Examples
• Oleamide
• Erucamide
• Strearamide
• Behenamide
• Oleamide & Erucamide - unsaturated fatty amides and
predominatly used as slip additives
• Stearamide & Behenamide - saturated fatty amides and
provides both slip & antiblock properties
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Antiblocking Agents - Mechanism Prevention of Blocking in Films
Prevention of Blocking in Films
Basic Building Block
Silica induces surface roughness, air enters between film layers and makes openability easier
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Anti block Additives- Examples
• Silica
• Talc
• Microfined Coated Calcium Carbonate
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Stabilisers
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Auto Oxidation Cycle for Polyolefins
Cycle II Cycle IRO. + .OHROO.R.
+ ROOH
R-H(Polymer)
Energy, Shear Melt ProcessingCatalyst Residues
R. Alkyl RadicalRO. Alkoxy RadicalHO. Hydroxy RadicalROO. Peroxy RadicalROOH Hydroperoxide
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Traditional Inhibited Auto Oxidation for Polyolefins
Cycle II Cycle IRO. + .OH ROO.R.
+ ROOH
R-H(Polymer)
Energy, Shear Melt ProcessingCatalyst Residues
Phenolic AOs react with free radicals to give inactive product, ROH & H2O
Phosphites react with Hydroperoxides to give inactive product, ROH
Phenolic AOs react with oxygen centered radicals
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“Phenol Free” Inhibited Auto Oxidation for Polyolefins
Cycle II Cycle IRO. + .OH ROO.R.
+ ROOH
R-H(Polymer)
Energy, Shear Melt ProcessingCatalyst Residues
Hydroxylamine / Hindered Amines react with free radicals to give inactive product, ROH & H2O
Phosphites react with Hydroperoxides to give inactive product, ROH
Hydroxylamines react with oxygen centered radicals
Nitrones react with carbon centered radicals
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Primary Stabilisers – Phenolic AOs : Examples
Basic Building Block
AO 3114 (anti gas Fading for fibres)
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Long Term Stabilisers – Thioether Synergists
Basic Building Block
Thioethers & Dithiols: Examples
DLTDP
DSTDP
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Melt Stabilisers – Peroxide Decomposers
Basic Building Block
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Melt Stabilisers – Peroxide Decomposers : Examples
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Metal Deactivators – Inhibits degradation by metal ions (catalyst residues)
Reaction Scheme of degradation in presence of Metal
Basic Building Block
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Metal Deactivators – Inhibits degradation by metal ions (catalyst residues) : Examples
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UV Stabilisers : Examples
Acknowledgement – CIBA GIEGY
Tinuvin 622
Chimasorb 119
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Vis- Breaking Additives
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Vis –Breaking Additives : Non woven & Melt blown
• Conventional Vis-breaking with Peroxide
• Peroxide free visbreaking
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Vis Breaking – New Technology
Acknowledgement – CIBA GIEGY
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Melt Blown Non Wovens : Scanning Electron Microscopy
Acknowledgement – CIBA GIEGY
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Anti Scratch Agents
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Anti Sctatch Additives
• Enables broader use of PP/TPO vs more expensive polymer
• Performs well in combination with light stabiliser & Colourants
• No exudation & Stickiness on parts surface
• Can be directly dosed during Injection Moulding
Acknowledgement – CIBA GIEGY
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Oxygen Scavengers
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Oxygen Absorbers
• To reduce and / or eleminate oxygen inside the package
• Enhances passive barrier performance
• Improves Product Shelf life
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Foaming / Blowing Agents
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Blowing Agents
• Chemical Blowing Agents
• Physical Blowing Agents
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High Melt Strength(HMS) PP +Blowing Agent :PP FoamFeatures of PP Foam• Cost savings due to lower material cost
and faster processability• Excellent impact propertieseven at lower
temperatures• Wide temp window (-40 Deg C to +120
DegC)• Microwave able retorting• Hot filling, Stretilisation possible• No restrictions with fatty food
compliance• Excellent humidity barrier• Smooth surface “Pleasant Touch”
Acknowledgement – Lyondell Basell Industries
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Wetting / Dispersion Agents
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Wetting Agents & Dispersion Agents Pigment Wetting
No Wetting
• No Effect on agglomerate cohesion• No Stabilisation• Phase seggregation and chalking• No Improvement of dispersability
• Weakening of agglomerate cohesion
• Stabilisation of primary parts
• Optimum dispersability
• No weakening of agglomerate cohesion
• Part stabilisation of primary parts
• Improves dispersability
Complete penetration
Only outside wetting
Wetting
Wax / Polymer
• Viscosity• Polarity
Pigment Agglomeration
• Capillary Forces• Particle &
Agglomerate Size• Particle Size
distribution• Surface Tension• Polarity
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Dispersion Additives - Examples
Description Acid Value Melting point
Ethoxylated alkylamine
- Liquid
Ethoxylated alkylamine
- 85 – 100 Degt C
Fatty Acid Esters 5 60 – 70 DegC
Fatty Acid Esters 5 Liquid
Alkane sulfonate 220 – 230 DegC
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Process Aids
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Why Use Process Aids (PPA ) ?
Eliminate Melt Fracture
Reduce die build up Reduce gels and optical defects
Reduce change over time
Reduce die pressure & extrusion temperature
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Applications of Process Aids
PE Films BOPP / OPP Films
HDPE Blow Molding
Cables Pipes
Sheets
Monofilaments & Fibres
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Process Aid - Examples
• Fluoro polymers
• Multi functional Complex Oleo-Chemical derivatives( Melt Flow Promoter +Ext. Lubricant +Dispersion Agent )
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Fillers
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Fillers – Performance modifying Agents
• Types- Mostly inorganics- Organic
• Examples- Calcium Carbonate , Talc , Nano Clays- Fibrous org., eg. Wood Flour
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Characterization of CaCO3
Particle Structures of Natural CaCO3 after grinding
influence the product properties
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CaCO3 – Most Important Properties
• Surface Treatment– Composition– Surface Coverage– Surface Tension
• Purity– Colour– Metal – “free”– Insolubles
• Particle Size– Particle Size distribution– Top Cut– Median PS– Specific Surface
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Nano Additives - Examples
• Organo treated Clays for Polymer Composites
• Speciality Zinc Oxide as anti microbials
• Photo catalytic Titanium dioxide
• Carbon nanotubes as additives nano nucleators based on silica.
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Nano Clay as filler
• Concept :The incorporation of single digit percentages of high surface area nano clays into host polymer systems improves the performance of the specific polymer matrix without significant deterioration of properties
• Benefits :- Reinforcement- Increased dimensional Stability & HDT- Lower Density- Increased melt strength- Thermoplastic Recyclable
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Nano Clays : Types
• Bentonite– A rock– A mixture of several minerals
(one is smectite)– Billions of tons worldwide
• Smectite– Component of bentonite– Known as a 2:1 layered clay– Clays in the smectite family
• Montmorillonite (di-octahedral)• Hectorite (tri-octahedral)• Others
10 microns
SEM of Unrefined Bentonite
TEM of Refined Montmorillonite
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Impala Side Moulding with nano composite : Example
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Global Additives Market
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Global Market – Polymer Additives by Volume
Global Additive Market ~ 21.8 billion lbs
22%
11%
21%
23%
23%North America
Europe
China
Asia Pacific
Other (India, SA, ME,East Eur. Africa)
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Global Market – Additives Segments by Type
Highest Consumption- Plasticizers followed by Property Extenders
58%24%
11%
7%Plasticisers
Modifiers (Nucl., Clarifying, Coupling agents,Imp. Modifiers, Processing Aids)
Property Extenders (AO, Antistat, Biocides,Heat & Light Stab, Flame Retardants)
Processing Aids (Antiblocks, Lubricants,Slips)
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PVC – The single Large consumer of Additives beside Polyolefins
Major Additive consumption by Type
- Plasticizers
- Stabilizer
- Lubricants
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Plasticizer - PVC : The Trend
• Phthalates, DEHP (DOP) are under environmental pressure but continue to remain as building block.
• Commercially available alternates, eg, adipates, benzoates,citrates & specialities( ESO,Polyesters) still expensive in comparison.
• New Development - Plasticizers from renewable sources , eg, isosorbide diesters- a sorbitol derivative ( DOP alike)
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Stabilizer – The Trend
• Enviornmental concerns changing PVC heat stabilizer market dynamics
• PVC applications are under pressure to replace heavy metal based stabilizersMixes metal stabilizers,eg Ca-Zn, tin stabilisers & organic alkyl phosphit stabilisers gradually replacing heavy metal stabilisers
• Organic compound based stabilizers will be trend setter – Reduction of inorganic component & proportionate increase of organic component to minimise the -ve impact.
• Future Trend – Development of organic stabilizers from organic renewable resources
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Conclusion : Trend & driving forces within polymer additive industry
• Global Majors focussing on niche products• Patent Expiry leading to newer players• One pack & customised additive formulations• Higher environmental awareness : Driving innovations
Technology Support and Partnership of
Poymer-Additive Mfg. leading Innovations
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Acknowledgements
• Fine Organics
• Jayvee Organics Pvt. Ltd.
• Indian Plastics Institute
• Polymer additive Manufactures
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Thank you for your attention