10/2010

2-component Construction Adhesives

DELO-AUTOMIX, DELO-DUOPOX, DELO-PUR

AIPI – Milano, 15 May 2014

DELO – Stefano Farina

10/2010

� Product description

� Application areas

� Reaction mechanism

� Processing

� Adhesive properties

� Dispensing

Contents

10/2010

Two-component construction adhesives

� DELO-DUOPOX Two-component, room-temperature-curing epoxy resinsas casting resins, adhesives or trowelling compounds

� DELO-PUR Two-component, room-temperature-curing polyurethanesas adhesives or casting resins

Properties:

� High-strength

� Flexible to tough-hard

� Can be used as construction adhesive in large layers

� Good resistance to many media

� Temperature of use up to 140 °C

10/2010

Processing and container types

� DELO-AUTOMIX DELO-DUOPOX or DELO-PUR adhesivesin 50 ml or 200 ml double chamber cartridges

� 1 kg tins / hobbocks of different sizesDELO-DUOPOX or DELO-PUR adhesives for manual or processing from 2C mixing systems

� 1 kg tins DELO-DUOPOX trowelling compounds for manual mixing

� Portion packagesDELO-DUOPOX 01 rapid; fast-curing epoxy resin formanual mixing in small quantities

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2C adhesives and casting resins in use

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Curing of epoxy resins

� Epoxy resins contain an epoxy ring as functional group

� When adding the hardener, the epoxy ring is opened while forming a hydroxyl group

� The reaction speed is mainly dependent on the hardener used

H H H Hl l l l

– C – C – H + H – X →→→→ – C – C – X\ / l lO HO H

Epoxy ring Hardener Hydroxyl group

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Hardeners for epoxy resins

Reaction partner Functionalgroup

Reactivity Application area DELOproducts

Thiol bond -SH fast reaction for fast-curing2C epoxy resins

01 rapid02 rapid03 rapid03 rapid thix

Aliphatic aminese. g., Triethylene tetramine

Diethylene triaminePolyaminoamide

-NH2 slow reaction for slow-curing2C epoxy resins

DUOPOX

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Curing of polyurethanes

For the formation of polymers for adhesives, urethanes with 2 functional groups are used.

H H H Hl l l l

–C–N–R1–N–C–O–R2–O–C–N–R1–N–C–O–R2–O– …ll ll ll llO O O O

O=C=N–R1–N=C=O + HO–R2–OH +

+ O=C=N–R1–N=C=O + HO–R2–OH + …

Polyurethane

Diisocyanates Diols

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Reaction with air humidity

Isocyanates react with water, e. g., with air humidity

� Special blister packages to protect the cartridges from humidity

R–N=C=O + H–OH � R–N–C–OHl ll

H O

Isocyanate

R–N–C–OH � R-NH2 + CO2l llH O

Substitutedcarbamine acid

Amine

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Significance of the mixing ratioB

on

d s

tren

gth

Mixing ratio acc. todata sheet

Mixingration

Goal:

Maintenance of the mixing ratio with an accuracy of ± 5 %

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Terms for the curing process

„Pot life“

Mixingof the

components

Processingtime /

Pot life /

Gel time

Time line

Str

engt

h

1 MPa

10 MPa

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Heat development / quantity prepared

DELO-DUOPOX 02 rapid

DELO-DUOPOX 6747 (casting resin)

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Curing – Acceleration by heat

0

2

4

6

8

10

12

14

16

18

15 min 30 min 45 min 60 min 24 h

Ten

sile

she

ar s

treng

th [M

Pa]

RT60 °C80 °C

DELO-PUR 9694

Determination of the tensile shear strength after storage at different temperatures

Tensile shear strength Al/Al, EN 1465, 0.2 mm distance, sand-blasted

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Temperature stability

Comparison of 1C and 2 C epoxy resin adhesives

0

5

10

15

20

25

30

35

40

0 20 40 60 80 100 120 140 160 180 200 220

Temperature T [°C]

Te

nsi

le s

he

ar

stre

ng

th [M

pa

]

DELO-MONOPOX 1196

DELO-DUOPOX 1895

DELO-DUOPOX 02 rapid

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Chemical resistance

DELO-DUOPOX AD895

Long-term resistance in dependence of different aging conditions

DIN EN 1465, curing for 72 h at rt, specimen material: aluminum, sand-blasted

0

5

10

15

20

25

30

72 h rt 6 monthsclimate

12 monthsclimate

1000 h 85/85

1000 h 100 °C

1000 h 150 °C

10000 h 140 °C

Te

nsi

le s

he

ar

stre

ngth

[MP

a]

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DELO-AUTOMIX System

This is how it is done:

� Insert the cartridge into the dispensing gun

� Remove the closure cap from the cartridge

� Attach the mixing tube

� Abandon the first content of the mixing tube to equalize possible fill level differences of the cartridge

� Leave the mixing tube on the cartridge

� after dispensing

� Attach a new mixing tube for dispensing after a longer break