Incozol BHAldimine Latent Curing Agent

Incozol® high performance additive for use in:

• flexible joint sealants• elastic bonding adhesives• general sealing & bonding compounds

2

Introduction

Joint Sealing Solutions

Joints and openings between construction elements can befound in different parts of a construction, e.g. between precastconcrete elements in facades, around windows and doors, atthe connection between floors and walls, in storage tanks, etc.

Joint sealants have to meet various requirements depending onthe function and location of the respective joint. The purpose ofjoint sealing is generally to:

• Prevent passage of media (air, water, chemicals, smoke, etc.)• Provide thermal and sound insulation• Enhance the visual appearance of the whole construction

Why elastic sealing?Building and civil engineering structures consist of individualelements which exhibit relative movements to each other. Thereare two kinds of such movements:

Structural movements These movements are caused by settlements of the structure,vibrations or other loads (wind etc.) and consequently deformthe joint dimensions and hence may stress the sealing materialsignificantly. Structural movements often result in shear stressacting on the sealant.

Advantages of elastic joint sealantsIn comparison to rigid materials (e.g. cement or mortar),high performance elastic joint sealants are able toaccommodate thermal and structural movements withoutbreaking or losing the adhesion to the building elements.These sealants thus retain their original functionalitythroughout their whole life cycle and provide long-termtightness.

Thermal movements Changes in temperature result in an expansion or contractionof the building elements, i.e. joints become larger (extension) orsmaller (compression) continuously. Thermal movements areconsiderable in the case of big elements or when differentmaterials are used (e.g. brick wall and vinyl window frame).

Expansion of building elements

Shear loads

Contraction of building elements

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3

Incozol BH

Incozol BH is an aldimine latent curing agent that hydrolyses on exposure to moisture, yielding a reactive aminecrosslinker and benzaldehyde.

It has been specially designed for one component PU systems and is suitable for use with both aromatic andaliphatic prepolymers.

Typical Applications: Flexible joint sealants, elastic bonding adhesives, general sealing & bonding compounds

Benefits

Prevents the generation of CO2 which can lead to gassing

Features

Enables bubble free curing at elevated temperature &humidity levels

Suitable for use in aromatic & aliphatic prepolymers

Very low viscosity

Very good storage stability with aromaticisocyanates

Excellent shelf-life

Bubble free & defect free films

Suitable for use in different climatic conditions

Greater formulation flexibility

Ideal for high solids systems

Improved handling over standard latent hardeners

Enhanced storage capabilities

H

N

RN

H O+

aldimine water

2

[cat. H+]R-NH2

amine aldehyde

O

C

H

R’C

H

R’+

isocyanate R’’ NCO

O

CN NH H

urea

R’’ R

H

NR

Low temperature crystallisation stability(down to -20ºC)

Latent curing agents are particularly beneficial in high-build polyurethane systems because they promotefaster through-cure with no CO2 gas evolution. In addition, they will accelerate the cure of low NCO containingprepolymers. Incozol BH also exhibits good in-can stability with aromatic prepolymers which makes it more suitedto 1K aromatic systems than standard latent curing agents.

Why use a latent curing agent?

Ease of handling & storage. Reduced energycosts (no heating required)

4

Guide formulation for 1K elastic sealant

Incozol BH in Elastic PU Joint Sealants

Material Parts by Weight

1. Prepolymer

2. Latent Hardener

3. Catalyst

4. Plasticiser

5. Filler

6. Pigment

7. Filler

Total

Desmoseal M280

Incozol BH

Oleic Acid

Diisodecyl phthalate

Dried CaCO3

TiO2

PVC

25

2.2

0.5

26.3

29

2

15

100

Properties

Standard

Skinning time (min)

Shore A hardness

Tensile strength (MPa)

Elongation at break (%)

E-modulus 100% (MPa)

Tear propagation resistance (N/mm)

70

17

1.9

600

0.2

4

ISO 868

ISO 37

ISO 37

ISO 8339

ISO 34

Manufacturing Instructions Disperse formulation for 20 minutes at 70ºC

Formulation GuidelinesFor each wt% NCO in the formulation, approx. 3-4% Incozol BH should be employed.Example: A formulation with an NCO content of 0.65% needs approx. 2.0-2.6% Incozol BH.

The curing speed, particularly the catalysis, depends on the individual formulation. This is because the reactivity ofthe latent hardener is dependent on the acidity/pH value of the system. Typical catalysts for the latent hardenerare organic acids such as Oleic Acid, Benzoic Acid, Salicylic Acid, Maleic Acid, Fumaric Acid, Succinic Acid,Adipic Acid, Toluenesulfinic Acid and similar types. Typical amounts are 0.02% to 1% acid but this may varystrongly from system to system. The reactivity will increase with the amount and the acidity level of the acid used.The catalyst used for the catalysis of the NCO-water reaction may be decreased to a minimum or even to zero.

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Sealing Solutions

Sealing Solutions for Movement JointsThe main requirements for a sealant in this application are:

• Low modulus even at low temperatures• Excellent weatherability• High colour stability and UV resistance• Good adhesion to porous and non-porous substrates• High tear resistance• Paintability• Resistance to cleaning procedures• Defect-free curing

Typical application example• Sealing of joints between precast concrete elements

Sealing Solutions for Connection JointsThe main requirements for a sealant in this application are:

• Broad adhesion range to porous and non-porous substrates• Compatibility to various substrates including plastics, paints

and coatings• High colour stability and UV resistance• Excellent weatherability• Paintability

Typical application examples• Sealing of joints between window frames and bricks of

concrete slabs

Sealing Solutions for Floor JointsSealants used for floor joints are required to have:

• High mechanical strength• High abrasion resistance• Good chemical resistance• Excellent adhesion properties

Depending on the area of application, additional properties maybe required.

Typical application examples• Sealing of floor connection joints in factories• Sealing of joints in car parks and pedestrian areas

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Incozol BH in Elastic Bonding Adhesives

Material Parts by Weight

1. Prepolymer

2. Latent Hardener

3. Catalyst

4. Plasticiser

5. Filler

6. Pigment

7. Thixotropic Agent

8. Filler

Total

Desmoseal M280

Incozol BH

Oleic Acid

Diisodecyl phthalate

Dried CaCO3

TiO2

Fumed Silica

PVC

33

3

0.5

22.5

19

2

5

15

100

Guide formulation for 1K spreadable/trowel applied adhesive

Properties

Standard

Skinning time (min)

Shore A hardness

Tensile strength (MPa)

Elongation at break (%)

Tensile shear - oak (MPa)

Tear propagation resistance (N/mm)

60

35

3.5

600

1.5

7

ISO 868

ISO 37

ISO 37

ISO 4587

ISO 34

Manufacturing Instructions Disperse formulation for 20 minutes at 70ºC

Formulation GuidelinesFor each wt% NCO in the formulation, approx. 3-4% Incozol BH should be employed.Example: A formulation with an NCO content of 0.65% needs approx. 2.0-2.6% Incozol BH.

The curing speed, particularly the catalysis, depends on the individual formulation. This is because the reactivity ofthe latent hardener is dependent on the acidity/pH value of the system. Typical catalysts for the latent hardenerare organic acids such as Oleic Acid, Benzoic Acid, Salicylic Acid, Maleic Acid, Fumaric Acid, Succinic Acid,Adipic Acid, Toluenesulfinic Acid and similar types. Typical amounts are 0.02% to 1% acid but this may varystrongly from system to system. The reactivity will increase with the amount and the acidity level of the acid used.The catalyst used for the catalysis of the NCO-water reaction may be decreased to a minimum or even to zero.

For a non-sag adhesive with initial tack refer to above formulation also

7

Sealing & Bonding Solutions

Waterproofing and bonding with only one product1K PU elastic adhesives formulated to include Incozol BH provide a waterproof layer and excellent resistance tothermal movement deformation. These properties make them ideal for external bonding applications such asbalconies, roofs and other areas exposed to water.

Sealing, bonding & filling all in oneCompounds can be formulated which remain permanently elastic andresistant to vibration and movement from temperature changes. Theycan also provide incredibly strong, permanent adhesion with excellenttack and non-sag properties. In addition, they can be used aswaterproof, permanently flexible fillers for wide gaps.

A versatile solutionIncozol BH provides moisture triggered technology which acceleratescure times. It also enables water and weatherproof compounds to bedeveloped which can be used inside and outside. They are easy and ready-to-use and are a versatile alternative to mechanical fixing.

Incorez Limited

Miller Street

Preston • Lancashire

PR1 1EA • England

t: +44 (0)1772 201964

f: +44 (0)1772 255194

e: info@incorez.com

w: www.incorez.com

Manufacturers of specialist resins & polymers:

• Oxazolidines

• Waterborne epoxy curing agents

• Waterborne polyurethane dispersions

ISSUE 1 - 03/13