Materials for Turbine Power Blades, Reinforcements, and Resins - Hybrid Anisotropic Materials for Wind Power Turbine Blades - page 62

TABLE 3.4
Cure.Time.of.Adhesive.Systems

EstimateBond
Strength,psi AdhesiveSystem AdhesiveType CuringTime

Araldite â .2005 Epoxy 20.min,.212 ° F/100 ° C 362.

Dexter.Hysol.EA9346 Epoxy 1.h,.250 ° F/121 ° C -

Giba.Geigy,.Epibond.
1545

Epoxy,.paste 2.h,.150 ° F/121 ° C -

Araldite.2007 Epoxy 2.h,.248 ° C/120 ° C 287

Giba.Geigy,.XMH.
8680

Polyurethane.paste 2.h,.120 ° F/48.8 ° C -

Super.epoxy Epoxy 68 ° F/20 ° C 281

Loctite.414-N.Primer Cyanoacrylate 68 ° F/20 ° C -

3.4 RapidCuringResinSystem

To. assist. recreational. and. industrial. markets. in. their. quest. for. increas-
ingly. more. eficient. composite. solutions. that. permit. production. rates. to.
increase. without. affecting. investment. and. labor. costs,. Hexcel. (Stamford,.
Connecticut). has. developed. a. new. epoxy. resin. system. able. to. break. the.
psychological. barrier. of. the. ive-minute. cure. cycle. 17 . Curing. in. only. two.
minutes.at.150°C/300°F,.HexPly ® .M77.brings.signiicant.advantages.to.the.
market,.especially.as.this.reactive.system.also.offers.a.long.shelf.life.of.six.
weeks.at.23°C.
Other.features,.such.as.a.Tg.(temperature.of.transition.glass).of.120°C/250°F.
and. good. adhesive. properties. (e.g.,. when. bonding. to. aluminum),. make.
HexPly.M77.highly.suitable.for.large.volume.production.as.in.the.manufac-
ture.of.skis.and.automotive.components..Being.conscious.to.deliver.perfor-
mance.without.expense.to.the.environment,.HexPly.M77.is.fully.compliant.
with.all.regulations.
Based.on.the.HexPly.M77.resin.system,.Hexcel.is.now.launching.a.range.
of.prepregs.based.on.glass.or.carbon.reinforcements,.in.multiaxial.form.as.
well.as.woven.fabrics.
Cycom ® . 5320-1. (Cytec. Engineered. Materials,. Anaheim,. California).
is. a. toughened,. epoxy. resin,. prepreg. system. designed. for. autoclaving,.
with. low. temperature. curing. capabilities. and. only. vacuum. bag. curing.
is. required.. This. epoxy. has. low. porosity,. low. VOCs,. and. can. be. recom-
mended. for. huge. turbine. blade. manufacturing. 18,19 . Table 3.5. shows. ten-
sile. properties. IM. iber. unidirectional. tape:. T40/800B. impregnated. by.
Cycom. 5320-1. (Nominal. FAW. 145. gsm;. nominal. resin. content. 33. percent.
by.weight).
Table 3.5.shows.the.IM.iber.unidirectional.tape:.T40/800B.(Nominal.FAW.
145.gsm;.nominal.resin.content.33.percent.by.weight).tensile.properties.