JEC COMPOSITES MAGAZINE - Issue #59 - August/September 2010 - 59

environmental conditions. However, not every epoxy resin is equally suited to the requirements of today’s engineering demands. At present, typical adhesives used for CFRP bonding contain – on the resin part – epoxies based on bisphenol A/bisphenol F in , combination with thickening agents such as fumed silica and other auxiliaries. The hardener part generally consists of aliphatic amines or polyamidoamines combined with impact modifiers, adhesion promoters and fillers. Figure 1 shows that lap shear strength values of approximately 20 MPa can be achieved with such types of adhesives, which is acceptable and sufficient for a large number of applications. However, the recent development work on composite bonders has been focused on high-end applications, which require long-term durability and excellent adhesion, not only on composite/composite bonding, but also when bonding composite structures to other substrates which can range from thermoplastics to metals. Rubber-like impact modifiers such as carboxyl- or amineterminated butadiene-acrylonitrile copolymers can be integrated into the formulation so that the adhesive makes the structure more resilient and flexible. Along with the implementation of long-chain polyamines into the hardener part, this results in a more ductile material, maintaining the original glass transition temperature of the adhesive. At the same time, this leads to increased flexibility, which is reflected in a higher elongation at break. Although epoxy-based adhesives are far from being truly flexible products, an increased elongation at break from 2-3% into the area of 6-8% has a significant effect on the bonded joint in terms of levelling out different mechanical characteristics of two substrates. At the same time, the outstanding mechanical

and thermal properties of the epoxy-based adhesive are maintained. The result can be seen in Figure 1, which displays the very high bond strength of the newly developed Araldite® AW 4858 / Hardener HW 4858 on CFRP substrates (> 40 MPa). Due to the chemical nature and the dense network which is formed during the cross-linking, this room temperature-curing adhesive displays a high bond strength which is maintained even under environmental conditions.

High adhesion, high temperature resistance, high health & safety standards
Having achieved a significant improvement in terms of bond strength on carbon-fibre-reinforced composites for high-end applications, the next step is to increase the temperature resistance of the adhesive. This enables bonded structures also to be used in environments which are exposed to high temperatures during their work-life, for example in racing car applications, the aerospace sector or in the general transportation area. Quite often, such systems are associated with a specific risk phrase which goes back to the use of dedicated highly-reactive, low-molecular-weight substances in the resin part. Such systems are classified as imposing the “Possible risk of irreversible effects” (risk phrase R68).

Fig. 2: Lap shear strength on sandblasted aluminium at different temperatures Araldite® AW 4859/Hardener HW 4859 displays superior temperature resistance, maintaining a lap shear strength of 10 MPa still at 120°C

Fig. 1: Comparison of a standard two-component epoxy-based adhesive with the new Araldite® CFRP bonders. Lap shear tests have been carried out at room temperature on abraded CFRP (carbon fibre-reinforced polymer)

The Araldite® AW 4859/Hardener HW 4859 system has proven that even without the use of raw materials falling into the above classification, high temperature resistance can be achieved. Figure 1 shows that adhesion onto CFRP is on a slightly lower level when compared with the previously described composite bonder, but the lap shear strength is still well above 35 MPa. At the same time, the lap shear tests carried out at different temperatures on sandblasted aluminium (Figure 2) show that a lap shear strength of 10 MPa is maintained even at 120°C. This black adhesive with a mixing ratio of 2:1 (vol/vol) cures at room temperature, as well as with accelerated curing cycles at temperatures such as 80°C.

No59 August - September 2010 / jec composites magazine

59



Table of Contents for the Digital Edition of JEC COMPOSITES MAGAZINE - Issue #59 - August/September 2010

Cover
Contents
NEWS WORLDWIDE
Goodrich Corporation acquires Crompton Technology Group
Reichhold expands manufacturing capacity in Turkey
LAP wins order from Airbus
Toho Tenax Europe to supply carbon fibre for Bombardier Cseries
Glass Fibre - A global competition for breakthrough composite applications
Agenda of events
Innovation - Phenolic prepreg products for interior applications
BUSINESS
Market survey: China Yuan Long FRP broadens its range of skills beyond pultrusion
Shanghai Tung Hsing Technology: steady growth through diversified markets
Niche Market Bio-based polymers: a revolutionnary change
Trends Kenaf, a fibre for the future: the Harusmas experience
Mechanical properties of naturalfibre-reinforced composites
FEATURE
Design - Wave impact resistance of racing yacht composites
Infusion - Regatta racing at the highest level
Adhesive - Flame-retardant adhesive for power packs in marine applications
Control - Validation of marine structures - Testing appraoches
Resin - New styrene-free resin: better for Catamaran Cruisers and the environment
VOC - Presatured wipes reduce VOC emissions
High performance - 48 days, 7 hours, 44 minutes around the world
USERS' PLATFORM
Composites in the world
Ying Yang table
The most luxurious golf car ever made
New carbon fibre band watch
Successful partners - A prefabricated FRP bridge for the oil and gas industry
Low-cost structural thermoplastic composites for transport
Making modular bus body shells from composite materials
Tougher fire-rated bus parts thanks to intumescent topcoat
KNOW-HOW
Bonding - Composite bonders - meeting the requirements of modern engineering
Manufacturing - ESTRIM - a fast-demoulding injection technology for epoxy composites
JEC COMPOSITES MAGAZINE - Issue #59 - August/September 2010 - Cover
JEC COMPOSITES MAGAZINE - Issue #59 - August/September 2010 - 2
JEC COMPOSITES MAGAZINE - Issue #59 - August/September 2010 - 3
JEC COMPOSITES MAGAZINE - Issue #59 - August/September 2010 - 4
JEC COMPOSITES MAGAZINE - Issue #59 - August/September 2010 - 5
JEC COMPOSITES MAGAZINE - Issue #59 - August/September 2010 - Contents
JEC COMPOSITES MAGAZINE - Issue #59 - August/September 2010 - 7
JEC COMPOSITES MAGAZINE - Issue #59 - August/September 2010 - Toho Tenax Europe to supply carbon fibre for Bombardier Cseries
JEC COMPOSITES MAGAZINE - Issue #59 - August/September 2010 - Glass Fibre - A global competition for breakthrough composite applications
JEC COMPOSITES MAGAZINE - Issue #59 - August/September 2010 - 10
JEC COMPOSITES MAGAZINE - Issue #59 - August/September 2010 - Agenda of events
JEC COMPOSITES MAGAZINE - Issue #59 - August/September 2010 - Innovation - Phenolic prepreg products for interior applications
JEC COMPOSITES MAGAZINE - Issue #59 - August/September 2010 - 13
JEC COMPOSITES MAGAZINE - Issue #59 - August/September 2010 - Market survey: China Yuan Long FRP broadens its range of skills beyond pultrusion
JEC COMPOSITES MAGAZINE - Issue #59 - August/September 2010 - Shanghai Tung Hsing Technology: steady growth through diversified markets
JEC COMPOSITES MAGAZINE - Issue #59 - August/September 2010 - 16
JEC COMPOSITES MAGAZINE - Issue #59 - August/September 2010 - Niche Market Bio-based polymers: a revolutionnary change
JEC COMPOSITES MAGAZINE - Issue #59 - August/September 2010 - 18
JEC COMPOSITES MAGAZINE - Issue #59 - August/September 2010 - 19
JEC COMPOSITES MAGAZINE - Issue #59 - August/September 2010 - 20
JEC COMPOSITES MAGAZINE - Issue #59 - August/September 2010 - Trends Kenaf, a fibre for the future: the Harusmas experience
JEC COMPOSITES MAGAZINE - Issue #59 - August/September 2010 - 22
JEC COMPOSITES MAGAZINE - Issue #59 - August/September 2010 - 23
JEC COMPOSITES MAGAZINE - Issue #59 - August/September 2010 - Mechanical properties of naturalfibre-reinforced composites
JEC COMPOSITES MAGAZINE - Issue #59 - August/September 2010 - 25
JEC COMPOSITES MAGAZINE - Issue #59 - August/September 2010 - 26
JEC COMPOSITES MAGAZINE - Issue #59 - August/September 2010 - 27
JEC COMPOSITES MAGAZINE - Issue #59 - August/September 2010 - Design - Wave impact resistance of racing yacht composites
JEC COMPOSITES MAGAZINE - Issue #59 - August/September 2010 - 29
JEC COMPOSITES MAGAZINE - Issue #59 - August/September 2010 - Infusion - Regatta racing at the highest level
JEC COMPOSITES MAGAZINE - Issue #59 - August/September 2010 - 31
JEC COMPOSITES MAGAZINE - Issue #59 - August/September 2010 - Adhesive - Flame-retardant adhesive for power packs in marine applications
JEC COMPOSITES MAGAZINE - Issue #59 - August/September 2010 - 33
JEC COMPOSITES MAGAZINE - Issue #59 - August/September 2010 - 34
JEC COMPOSITES MAGAZINE - Issue #59 - August/September 2010 - Control - Validation of marine structures - Testing appraoches
JEC COMPOSITES MAGAZINE - Issue #59 - August/September 2010 - 36
JEC COMPOSITES MAGAZINE - Issue #59 - August/September 2010 - 37
JEC COMPOSITES MAGAZINE - Issue #59 - August/September 2010 - Resin - New styrene-free resin: better for Catamaran Cruisers and the environment
JEC COMPOSITES MAGAZINE - Issue #59 - August/September 2010 - 39
JEC COMPOSITES MAGAZINE - Issue #59 - August/September 2010 - VOC - Presatured wipes reduce VOC emissions
JEC COMPOSITES MAGAZINE - Issue #59 - August/September 2010 - 41
JEC COMPOSITES MAGAZINE - Issue #59 - August/September 2010 - 42
JEC COMPOSITES MAGAZINE - Issue #59 - August/September 2010 - High performance - 48 days, 7 hours, 44 minutes around the world
JEC COMPOSITES MAGAZINE - Issue #59 - August/September 2010 - 44
JEC COMPOSITES MAGAZINE - Issue #59 - August/September 2010 - 45
JEC COMPOSITES MAGAZINE - Issue #59 - August/September 2010 - New carbon fibre band watch
JEC COMPOSITES MAGAZINE - Issue #59 - August/September 2010 - Successful partners - A prefabricated FRP bridge for the oil and gas industry
JEC COMPOSITES MAGAZINE - Issue #59 - August/September 2010 - 48
JEC COMPOSITES MAGAZINE - Issue #59 - August/September 2010 - 49
JEC COMPOSITES MAGAZINE - Issue #59 - August/September 2010 - Low-cost structural thermoplastic composites for transport
JEC COMPOSITES MAGAZINE - Issue #59 - August/September 2010 - 51
JEC COMPOSITES MAGAZINE - Issue #59 - August/September 2010 - 52
JEC COMPOSITES MAGAZINE - Issue #59 - August/September 2010 - Making modular bus body shells from composite materials
JEC COMPOSITES MAGAZINE - Issue #59 - August/September 2010 - 54
JEC COMPOSITES MAGAZINE - Issue #59 - August/September 2010 - Tougher fire-rated bus parts thanks to intumescent topcoat
JEC COMPOSITES MAGAZINE - Issue #59 - August/September 2010 - 56
JEC COMPOSITES MAGAZINE - Issue #59 - August/September 2010 - 57
JEC COMPOSITES MAGAZINE - Issue #59 - August/September 2010 - Bonding - Composite bonders - meeting the requirements of modern engineering
JEC COMPOSITES MAGAZINE - Issue #59 - August/September 2010 - 59
JEC COMPOSITES MAGAZINE - Issue #59 - August/September 2010 - 60
JEC COMPOSITES MAGAZINE - Issue #59 - August/September 2010 - 61
JEC COMPOSITES MAGAZINE - Issue #59 - August/September 2010 - 62
JEC COMPOSITES MAGAZINE - Issue #59 - August/September 2010 - Manufacturing - ESTRIM - a fast-demoulding injection technology for epoxy composites
JEC COMPOSITES MAGAZINE - Issue #59 - August/September 2010 - 64
JEC COMPOSITES MAGAZINE - Issue #59 - August/September 2010 - 65
JEC COMPOSITES MAGAZINE - Issue #59 - August/September 2010 - 66
JEC COMPOSITES MAGAZINE - Issue #59 - August/September 2010 - 67
JEC COMPOSITES MAGAZINE - Issue #59 - August/September 2010 - 68
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