Adhesives einzel druck - Huntsman Corporation Library/a... · (2K) adhesive systems. Suitable for industrial and Do-It-Yourself (DIY) bonding tasks, the resulting polyurethane resins

SUPRASEC® 2144, 2244 and 2944

POLYURETHANES

High-end prepolymers for formulating structural wood adhesives

SUPRASEC® 2144, 2244 and 2944 Huntsman's new product family for the formulation of structural wood adhesives

page

A pioneering approach to polyurethane 3

Polyurethane-based wood adhesives 4

Wood adhesives based on Huntsman's SUPRASEC® MDI 5

Product specifics – summary overview 7

Product specifics – strength build-up 9

SUPRASEC® product performance against EN 204 11

Industry standards: DIN EN 14257 (WATT-91) 13

Processing recommendations 15

Table of contents

2

A pioneering approach to polyurethane

In the 1960s scientists working for organizations that now form part of Huntsman, pioneered the development of methyl diphenyl diisocyanate (MDI). Today, Huntsman maintains a deep understanding of this versatile chemistry.

Through a program of continuous innovation, the business remains at the forefront of

prepolymer development. Working closely with customers to support their formulation,

processing and handling requirements, Huntsman chemists provide practical advice

and technical support on the use of MDI in a vast array of markets and applications,

including high performance adhesives.

High performance adhesivesMDI from Huntsman can be used in the formulation of one- (1K) and two-component

(2K) adhesive systems. Suitable for industrial and Do-It-Yourself (DIY) bonding tasks,

the resulting polyurethane resins can help overcome the most complex assembly

challenges. Tough yet elastic, and with the ability to flex with substrates as they move,

expand and contract, polyurethane adhesives create long lasting bonds with enginee-

ring materials such as concrete, plastic, metal and wood.

Wood adhesivesAdhesives have been employed for centuries in the production of wooden items. They

are a standard joining technique in furniture fabrication; are widely used across the

construction sector in joists, beams and panel applications; and also add value in niche

industries such as the marine sector in decking, jetty and boat building projects.

With increasing global awareness of the need for sustainable, ecological products,

wood usage in engineering and construction applications is intensifying. This in turn is

driving up demand for polyurethane-based structural adhesives – a successor to first

generation formaldehyde systems.

3SUPRASEC® 2144, 2244 and 2944 Huntsman's new product family for the formulation of structural wood adhesives

SUPRASEC® 2144, 2244 and 2944 Huntsman's new product family for the formulation of structural wood adhesives4

Polyurethane products are well known for their strength and versatility in structural wood adhesive applications. They offer many technical and engineering advantages including:

Exceptionally strong bonding of wood and superior ageing properties

Adaptable curing speeds that can be fine tuned to suit fast and slow cure

assembly techniques

Good, deep wetting and uniform penetration properties creating a large bonding

interface

Excellent reactivity with water naturally occurring in wood, creating strong

crosslinks that add to overall adhesive strength.

Polyurethane-based wood adhesives: the benefits


Huntsman has developed a family of MDI-based resins that are the ideal raw material to use in the manufacture of adhesives for load bearing timber systems such as structural joists and beams. Based on the company's established SUPRASEC® resin technology, the portfolio contains three products – each designed to cure at different speeds.

SUPRASEC® 2144 is a 1K, moisture curing pre-polymer with a slow cure profile.

Developed specifically for customers that need a longer open time and pot life

during assembly, the resulting adhesive bond offers excellent mechanical properties.

SUPRASEC® 2244 is an established isocyanate that has been widely used in the

production of 1K wood adhesives for a number of years. Renowned for its mechani-

cal performance capabilities it has a medium open time of around one hour.

SUPRASEC® 2944 is an ultra fast, 1K, moisture curing prepolymer that has an

open time of less than ten minutes. Pushing the boundaries of resin technology it

achieves very quick green strength and through-cure without jeopardizing any of the

physical performance properties expected of a SUPRASEC® product. It is ideal for

high-speed line processing.

5

Wood adhesives based on Huntsman's SUPRASEC® MDI

6

SUPRASEC®

High-end prepolymers for structural wood adhesive formulators

The following tables provide an overview of each SUPRASEC® product for structural

wood adhesive formulation and their individual characteristics:

General properties SUPRASEC® grade

2144 2244 2944

Appearance clear light yellow liquid

NCO (%) 15,2 15,2 15,2

Viscosity (mPa.s) @ 25ºC 1650 1800 1800

Density (g/cm³) 1,10 1,11 1,11

Reaction properties SUPRASEC® grade

2144 2244 2944

General reaction speed very slow medium fast

Start opening time (min) 240 60 10

End opening time (min) 450 90 40

Time to achieve ≥ 1MPa (min) 420 min 150 min 15 min

Strength (MPa) after 1 Hr N/A N/A 10,7

7

Product specifics – summary overview


Adhesive strength (MPa) SUPRASEC® grade

2144 2244 2944

Final strength 11 14,5 14,5

Strength after boiling test (D4) 4,6 8,3 7,8

Water test (D4) 5,1 7,6 7,8

DIN EN 14257 (WATT 91) 7,9 14,3 10,6

8

SUPRASEC®



Time (Hr)

16

12

8

4

00,1 1 10 100 1000

Lap shear (MPa)

The following graph shows the strength build-up of each of the three structural wood

adhesive SUPRASEC® grades.

The measurements plotted below clearly show the difference in both the speed of

strength build-up and final outcomes.

Strength build-up (Lap shear, MPa) versus time (min., on logarithmic scale).

9

Product specifics – strength build-up

SUPRASEC® 2144 SUPRASEC® 2244 SUPRASEC® 2944

10

SUPRASEC®



The graph provides strong evidence that each of the three SUPRASEC® resins can

pass the D4 norm and outperform current industry expectations in a number of

different test scenarios. All three isocyanates demonstrate lap shear strength of 10 MPa

and above upon full curing. In addition:

After four days submersed in cold water (20+/-5°C) lap shear strength remains

over 4 MPa.

Lap shear strength after a six hour boiling test, followed by two hours immersed in

cold water, stayed in excess of 4 MPa.

11

All three SUPRASEC® products have been tested using standard EN 204 for structural

wood adhesives. The following graphic gives an overview of each of the adhesives’

relative strengths measured at different stages of the EN 204 testing process.

no surface preparation on beech specimenno surface preparation on beech specimen11

05 05

14,5

08

08

15

08 08

0

4

8

12

16

7 days curing 4 days cold water 6Hr boiling + 2Hr cold water

Lap Shear (MPa) 23 ºC 50 % R.H. Lap shear (MPa)

Strength after curing and after EN 204 tests of SUPRASEC® 2144, 2244 and 2944 versus benchmark.

All measurements were carried out on unprepared beech wood, at 23°C and 50% relative humidity.

D4 threshold values are indicated with a red line.


SUPRASEC® product performance against EN 204

12

SUPRASEC®


SUPRASEC® 2144, 2244 and 2944 Huntsman's new product family for the formulation of structural wood adhesives 13

Industry standards: DIN EN 14257 (WATT-91)

Heat resistance of SUPRASEC® 2144, 2244 and 2944 according to DIN EN 14257 (WATT 91)

DIN EN 14257 (also known as WATT-91) is the prevailing standard for determining heat

resistance for applications in the wood industry. The parameter for heat resistance of an

adhesive is the breaking load tensile shear strength at 80°C in N/mm2, which must be

measured using standardized criteria.

DIN EN 14257 / WATT-91 does not require minimum values. It is a neutral assessment.

However, a value of 7.5 N/mm2 is often cited as a recommendation or a minimum

requirement regarding heat resistance when producing window frame squares.

(Source; Industrieverband Klebstoffe (IVK))

Measurements performed on SUPRASEC® 2144, 2244 and 2944, using DIN EN

14257, show that all three products pass the 7.5 N/mm2 recommendation value in

the graph below.

11

08

14,5 1415

11

0

5

10

15

20

7 days curing Watt 91

Lap Shear (MPa) Lap shear (MPa)


14

SUPRASEC®



Huntsman's latest SUPRASEC® grade innovations have exceptionally high mechanical

and ageing properties. With a wide range of reactivities and low viscosity, each of

the three raw materials are suitable for combining with fillers and fibers and can add

significant value to a variety of adhesive systems for use in structural wood applications.

For more information, please visit: www.huntsman.com/pu/. To obtain a sample,

discuss specific formulation requirements, or confirm which other substrates

can be bonded using adhesives based on SUPRASEC® resins, please contact:

[email protected]

Heat resistance of SUPRASEC® 2144, 2244 and 2944 versus market benchmark according to

DIN EN 14257 (WATT-91)

15

Processing recommendations

7 veneers spruce

5 cm width * 2 cm thickness * 60 cm length

SUPRASEC® 2944 – appearance processed on machine

12

3

Huntsman Polyurethanes is committed to working closely with its customers and can offer a fast and flexible response to your needs. We offer direct links to our laboratories with full technical backup. Commercial support and dedicated customer service is available throughout Europe, the Middle East, Asia-Pacific and the Americas.

European Headquarters [email protected]

Fax: 32 (0) 2 758 5501www.huntsman.com/pu/ACE

About Huntsman:Huntsman is a global manufacturer and marketer of differentiated chemicals. Our operating companies manufacture products for a variety of global industries, including chemicals, plastics, automotive, aviation, textiles, footwear, paints and coatings, construction, technology, agriculture, health care, detergent, personal care, furniture, appliances and packaging. Originally known for pioneering innovations in packaging and, later, for rapid and integrated growth in petrochemicals, Huntsman has approximately 12,000 employees and operates from multiple locations worldwide. The Company had 2012 revenues of over $11 billion. For more information about Huntsman, please visit the company's website at www.huntsman.com.

Huntsman Polyurethanes warrants only that its products meet the specifications agreed with the buyer. Typical properties, where stated, are to be considered as representative of current production and should not be treated as specifications. While all the information and recommendations in this publication are to the best of our knowledge, information and belief accurate at the date of publication, NO GUARANTY, WARRANTY OR REPRESENTATION IS MADE, INTENDED OR IMPLIED AS TO THE CORRECTNESS OR SUFFICIENCY OF ANY INFORMATION OR RECOMMENDATION OR AS TO THE MERCHANTABILITY, SUITABILITY OR FITNESS OF ANY PRODUCTS FOR ANY PARTICULAR USE OR PURPOSE. IN ALL CASES, IT IS THE RESPONSIBILITY OF THE USER TO DETERMINE THE APPLICABILITY OF SUCH INFORMATION AND RECOMMENDATIONS AND THE SUITABILITY OF ANY PRODUCT FOR ITS OWN PARTICULAR PURPOSE. NOTHING IN THIS PUBLICATION IS TO BE CONSTRUED AS RECOMMENDING THE INFRINGEMENT OF ANY PATENT OR OTHER INTELLECTUAL PROPERTY RIGHT AND NO LIABILITY ARISING FROM ANY SUCH INFRINGEMENT IS ASSUMED. NOTHING IN THIS PUBLICATION IS TO BE VIEWED AS A LICENCE UNDER ANY INTELLECTUAL PROPERTY RIGHT.

Products may be toxic and require special precauti-ons in handling. The user should obtain Safety Data Sheets from Huntsman Polyurethanes and Huntsman Performance Products containing detailed information on toxicity, together with proper shipping, handling and storage procedures, and should comply with all applicable safety and environmental standards. Hazards, toxicity and behaviour of the products may differ when used with other materials and are dependent on the manufacturing circumstances or other processes. Such hazards, toxicity and behaviour should be determined by the user and made known to handlers, processors and end users.

SUPRASEC® is a registered trademark of Huntsman CORPORATION or an affiliate thereof, in one or more countries, but not all countries.

Copyright © 2013 Huntsman CORPORATION or an affiliate thereof. All rights reserved.

www.huntsman.com

Phone: 32 (0) 2 758 9211

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Adhesives einzel druck - Huntsman Corporation Library/a... · (2K) adhesive systems. Suitable for industrial and Do-It-Yourself (DIY) bonding tasks, the resulting polyurethane resins