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nolax is the adhesive scene’s
farmteam. We sow ideas and
visions, let them sprout, and
nurture them to market
readiness.
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Another way of thinking…
Andreas Dobmann
nolax – Sempach Station, Switzerland
PIR-a New Class of Structural Polyurea Based Adhesives
The 2016 ASC Fall Convention
Indianapolis (IN), October 18th, 2016
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Topics:
‒ polyurethane and polyurea based adhesive
‒ polyisocyanurate (PIR) based polymers
‒ performance of PIR polyurea based adhesive in comparison
with polyurethane and/or polyureas
‒ how to apply a PIR polyurea based adhesive?
‒ typical end applications of PIR polyurea based adhesives
‒ summary and outlook
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Polyurethane Based 2K Adhesive
‒ base chemicals isocyanate plus polyol
‒ ratio isocyanate: polyol typically approx. 1:1
‒ typical end use: adhesives, foams, elastic parts etc.
‒ mixing and dosing: static and dynamic mixers
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Relative Reaction Rates of Selected Nucleophiles
with Isocyanate
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nucleophile structure relative reaction rate
constant (non-catalyzed) @ 25°C
Primary aliphatic amine R-NH2100'000
Secondary aliphatic amine R1R2-NH 20'000–50'000
Primary aromatic amine Ar-NH2200–300
Primary alcohol R-CH2-OH 100
Water H2O100
Secondary aromatic amine R1Ar-NH 100
Secondary alcohol R1R2-CH-OH 30
Source: http://www.poliuretanos.com.br/Ingles/Chapter1/131Isocyanates.htm
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Polyurea Based 2K Adhesive
‒ base chemicals isocyanate plus polyamine
‒ ratio isocyanate: polyamine approx. 1:1
‒ typical end use: coatings, adhesives not very common
‒ mixing and dosing: dedicated technology requested due to
high reaction speed
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Polyisocyanurate (PIR)-
Isocyanate and Polyol Based
‒ isocyanate plus polyol, ratio 2-5:1,
‒ PIR formation needs catalyst and heat
‒ high crosslinking density
‒ high temperature resistance up to 250°C (482°F)
‒ typical end use: hard insulation foams for the building industry
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Polyisocyanurate (PIR)-
Isocyanate and Polyamine Based
‒ isocyanate plus polyamine, ratio 2-5:1 = strong exothermic
reaction
‒ PIR formation due to exothermic reaction needs only a
catalyst
‒ combines PIR properties with polyureas reaction speed
‒ excellent mechanical properties even at elevated temperatures
‒ patented as an adhesive composition under EP 2871194 B1
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Polyurethane, Polyurea and PIR Based Adhesive
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Polyurethanes Polyureas PIR
crosslinking time minutes–hours seconds–
minutes
seconds–
minutes
mechanical
properties
flexible–hard flexible–hard hard
elongation at
break
>1000% >600% <100%
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Polyurethane, Polyurea and PIR Based Adhesive
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Polyurethanes Polyureas PIR
tensile strength <20 MPa <40 MPa <60 MPa
temperature
resistance
120-180°C
(248-392°F)
approx. 160°C
(320°F)
>200°C
(>392°F)
adhesion on
different
substrates1)
fulfilled fulfilled fulfilled
1) polyolefin excluded
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PIR Based Polyurea Adhesives:
Tensile Strength as Function of Temperature
‒ high tensile strength but not brittle
‒ high impact resistance
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0
100
200
300
400
500
600
700
800
900
0
5
10
15
20
25
30
35
40
45
0 20 40 60 80 100 120 140 160 180 200
E-module(MPa)
tensile strength (MPa)
temperature (°C)
tensile strength E-Module
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How to Apply a PIR Based Adhesive?
High Pressure Impingement Mixing
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Pump A Pump B
Filter Filter
Component BComponent A
Pressure: 100 – 200 bar
Injection hole: 0.1 mm
Mixing chamber diameter: 0.6 – 0.8 mm
Feed: >3 g/sec.
Source: Isotherm AGSource: Isotherm AG
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How to Apply a PIR Based Adhesive?
High Pressure Impingement Mixing
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Processing PIR Polyurea Systems
Application technology
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End Applications of PIR Polyurea
Based Adhesives
‒ Injection applications of adhesives
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End Applications of PIR Polyurea Based
Adhesives
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End Applications of PIR Polyurea Based
Adhesives
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‒ Applications in glazing industry
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End Applications of PIR Polyurea Based
Adhesives
‒ Injection applications of adhesives
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In-situ Manufacturing of Assembly Clips
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In-situ Manufacturing of Assembly Clips
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PIR Based Adhesive at Work
https://vimeo.com/117389083
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Summary and Outlook
The combination of polyurea and PIR reactions leads to unique
adhesives with the following properties:
‒ wide adhesion spectrum to different substrates
‒ excellent shear strength at elevated temperatures
‒ high impact resistance (depending on the formulation)
‒ designed for bulk applications like adhesive injection
technology
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Thank you very much for your attention!
‒ A special thanks go to my colleagues
Stephan Buser, Beat Bruderer and Patrick Steiner
for their support in preparing this presentation
Questions?
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start-ups in which joining
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solve an assignment in a new
way – more elegantly,
efficiently, safely, quickly, and
– at the same time – more
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