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High-end prepolymers for formulating structural wood adhesives

SUPRASEC® 2144, 2244 and 2944

SUPRASEC® 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 adhesives

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A pioneering approach to polyurethane 2

Polyurethane-based wood adhesives 3

Wood adhesives based on Huntsman SUPRASEC® MDI 4

Product specifics – summary overview 6

Product specifics – strength build-up 8

SUPRASEC® performance against EN 204 10

Industry standards: DIN EN 14257 (WATT-91) 12

Processing recommendations 14

Table of contents

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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 engineering 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.

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SUPRASEC® 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 adhesives3

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 mechanical 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 boun daries 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.

Wood adhesives based on Huntsman SUPRASEC® MDI

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

SUPRASEC®

High-end prepolymers for structural wood adhesives formulators

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Product specifics – summary overview

The following tables provide an overview of each SUPRASEC® product for structural wood adhesive formulation and their individual characteristics:

General properties SUPRASEC® 2144 2244 2944Appearance clear light yellow liquid NCO (%) 15,2 15,2 15,2Viscosity (mPa.s) @ 25ºC 1650 1800 1800Density (g/cm³) 1,10 1,11 1,11

Reaction properties SUPRASEC® 2144 2244 2944General reaction speed very slow medium fast Start Opening Time (min) 240 60 10End Opening Time (min) 450 90 40Time to achieve ≥ 1MPa (min) 420 min 150 min 15 minStrength (MPa) after 1 Hr N/A N/A 10,7

Adhesive Strength (MPa) SUPRASEC® 2144 2244 2944Final strength 11 14,5 14,5Strength after boiling test (D4) 4,6 8,3 7,8Water test (D4) 5,1 7,6 7,8DIN EN 14257 (WATT 91) 7,9 14,3 10,6

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SUPRASEC®


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Time (Hr)

16

12

8

4

00,1 1 10 100 1000

Lap Shear (MPa)

SUPRASEC® 2144

SUPRASEC® 2244

SUPRASEC® 2944

Product specifics – strength build-up

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)

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SUPRASEC®


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SUPRASEC® performance against EN 204

All three SUPRASEC® products were 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.

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.

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.

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no suface 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)

SUPRASEC® 2144

SUPRASEC® 2244

SUPRASEC® 2944


SUPRASEC®


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Industry standards: 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 80oC 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 re-quirement regarding heat resistance when producing window frame squares. (Source; 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 fi-gure below.

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08

14,5 1415

11

0

5

10

15

20

7 days curing Watt 91

Lap Shear (MPa)

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

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SUPRASEC® 2144

SUPRASEC® 2244

SUPRASEC® 2944


SUPRASEC®


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Processing recommendations

Huntsman’s latest SUPRASEC® 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®, please contact: [email protected]

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

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AMERICASHuntsman2190 Executive Road Blvd.USA - Auburn Hills, MI 48326Tel.: +1 248-322-7394Fax.: +1 248-322-7404e-mail: [email protected]

Sales locations:

EAMEIHuntsman (Germany) GmbHHafenringstraße 1D - 49090 OsnabruckTel.: +49 541 9141-0Fax: +49 541 9141-395e-mail: [email protected]

APACHuntsman Polyurethanes (China) Ltd.452 Wen Jing Road, Minhang Econ. & Tech.Dev. Zone, Shanghai 200245, P.R. ChinaTel: +86 21 24037288Fax: +86 21 24037228e-mail: [email protected]

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 labo-ratories 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]: 32 (0) 2 758 9211Fax: 32 (0) 2 758 5501www.huntsman.com/pu/ACE

The Huntsman-StoryHuntsman Polyurethanes is a business division of Huntsman Corporation, a global manufacturer and marketer of differentiated chemicals. Combining international reach with local support, Huntsman‘s operating companies manufacture products for a variety of global industries. These include chemicals, plastics, automotive, aviation, textiles, footwear, paints and coatings, construction, tech-nology, agriculture, healthcare, detergent, personal care, furniture, appliances and packaging. Originally known for pioneering innovations in packaging, and later rapid, integrated growth in petro- chemicals, Huntsman today has 11,000 employees and operates from multiple locations worldwide. The Company had 2009 revenues of approximately $8 billion.

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 pro-duction 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 precautions in hand-ling. The user should obtain Safety datasheets from Huntsman Polyurethanes and Huntsman Performance Products containing de-tailed 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 depen-dent 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.

IROGRAN®, IROSTIC®, AVALON® and KRYSTALGRAN® are regi-stered trademarks of Huntsman Corporation or an affiliate thereof in one or more countries, but not all countries. Copyright © 2010 Huntsman Corporation or an affiliate thereof. All rights reserved.

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