Spray Adhesives

[ahender]

Looking for spray adhesive alternatives to 3M 77. I have seen several references to resin-based alternatives, but no mention of product names.

Will be using it with a carbon/epoxy layup.

Is anyone using a product other than 3M?

Thanks...Alan

[Herman]

North Star Chemicals NG-IF. Ask them for a report on shear strength influence, they have it.

Otherwise Airtac2 from Airtech.

[ahender]

Excellent. Thanks.

Alan

[ondarvr]

NuTack® E 046-4103, 046-4106
REACTIVE TACKIFIER FOR USE WITH EPOXY RESINS IN RTM,
VACUUM BAGGING AND INFUSION APPLICATIONS
AEROSOL PACKAGING
(Copyright 2009)
DESCRIPTION:
NuTack® E 046-4103 and 046-4106 are sprayable, polymeric based tackifiers. They are designed for use in RTM, VARTM or vacuum bagging processes. NuTack® E 046-4103 and 046-4106 provide enhanced positioning of coring materials and dry glass fiber or carbon fiber roll goods. NuTack® E 046-4103 and 046-4106 are based on a reactive, toughened polymer technology specifically designed for use with epoxy resins. NuTack® E 046-4103 is a neutral for color sensitive applications. NuTack® E 046-4106 contains a blue dye for visual thickness control.
FEATURES AND BENEFITS:
4 Excellent adhesion to reinforcing glass fiber and carbon fiber roll goods as well as coring products
4 Maintains interlaminar strength between plies in the finished part
4 Maintains the cure and flow properties of epoxy infusion resins
4 Reactive chemistry allows broad application window
4 Neutral (NuTack® E 046-4103) available for color sensitive applications
4 Blue (NuTack® E 046-4106) available to provide visual thickness control.
4 Convenient aerosol packaging
APPLICATION:
1. Use NuTack® E as supplied in the aerosol can. Shake the can well before each use.
2. Wear safety glasses and protective clothing. Use NuTack® E only with adequate ventilation. Always point the spray tip away from body hand or face.
3. Protect surrounding surface areas from over-spray by using paper, plastic film or cardboard.
4. Hold the container about 8-10 inches from the surfaces to be tacked and spray a continuous film of NuTack® E on one or both surfaces. Use the minimum amount needed to hold the two surfaces together. Typical application thicknesses are 0.5-1.0 mils. One mil will weigh approximately 2.0-g/ft2 while wet or 1.0-g/ft2 after solvent evaporation. Use the blue dye color of NuTack® E as a visual thickness guide. One container of NuTack® E should allow coverage of 150-300 ft2 if applied at the recommended 0.5 to 1.0 mils thickness.
5. Firmly press dry fiber plies or core materials into the NuTack® E tackifier.
6. Repeat steps 4 and 5 as often as needed to build proper laminate and core schedules. Re-apply more NuTack® E after several hours if tack is too low or if dry goods require re-positioning.
NuTack®E046-4103and046-4106
Copyright 2009
7. Clean up can be done with a variety of solvents and paint thinners.
PRODUCT PERFORMANCE:
Mechanical properties of laminates fabricated using NuTack® E and a popular non-reactive adhesive were evaluated for physical properties and compared to laminates fabricated without using tackifier. Non-reactive, rubberized, adhesive based products have been the standard for positioning reinforcements and core during the RTM, VARTM or vacuum bagging processes. Interlaminar shear, compression and flexural testing were used to characterize adhesion between plies of an infused laminate. For both adhesion tests, NuTack® E and the non-reactive adhesive were applied per manufacturer’s instructions. Test laminates were fabricated using 15 plies of 18 oz/ft2 glass fiber woven roving. Tackifier was applied between each ply. The tackifier application thickness was limited to 1 mil. The laminates were then infused with Rhino R-1401-21 epoxy resin and H-4101-21 Fast Hardener (100 parts resin to 30 parts hardener).
Test results are shown in Figures 1-4.
Figure 1: Interlaminar Shear Results 01,0002,0003,0004,0005,0006,000Interlaminar Shear Strength, psiNon-Reactive AdhesiveNuTack ENo Tackifier
Figure 2: Compressive Strength 05,00010,00015,00020,00025,00030,000Compressive Strength, psiNon-Reactive AdhesiveNuTack ENo Tackifier
NuTack® E 046-4103 and 046-4106
Copyright 2009
Figure 3: Flexure Strength 010,00020,00030,00040,00050,00060,000Flexure Strength, psiNon-Reactive AdhesiveNuTack ENo Tackifier
Figure 4: Flexure Modulus 0500,0001,000,0001,500,0002,000,0002,500,000Flexure Modulus, psiNon-Reactive AdhesiveNuTack ENo Tackifier
Property retention of laminates fabricated with the non-reactive adhesive and NuTack® E are shown in the Table below.
Property Retention
(versus No Tackifier)
Test Method1
Non-Reactive Adhesive
NuTack® E
Interlaminar Shear Strength
ASTM D2344
30%
93%
Compressive Strength
ASTM D695
52%
92%
Flexure Strength
29%
93%
Flexure Modulus
ASTM D790
70%
104%
Notes:
1. Tests conducted per an internal CCP test methods similar to the ASTM methods.
Laminates tacked with NuTack® E had much higher physical properties than those tacked with the non-reactive tackifier. Laminates tacked with NuTack® E had very similar physical properties to laminates fabricated without tackifier. Use of the non-reactive tackifier resulted in significantly decreased physical properties.
For the testing reported above, the tackifier application was tightly controlled by weighing; however, tackifier application amounts may vary in manufacturing shops. The tackifiers themselves regulate under application. The affect of over application is a concern. Evaluation of
NuTack® E 046-4103 and 046-4106
Copyright 2009
the non-reactive adhesive showed that over application interrupted the resin flow resulting in laminates with dry glass and low physical properties. Over application of NuTack® E had much less affect on resin flow and physical properties. While over application of NuTack® E is less problematic than with the non-reactive adhesive, CCP recommends that NuTack® E be applied at the minimum amount needed to hold reinforcements or coring materials.
The physical properties reported above demonstrate the performance of NuTack® E. However, each manufacturer should test the product using their specific laminate designs, materials and under their usage conditions.
RELATED PRODUCTS:
NuTack® E 046-4102 is a pressure pot sprayable version available in 5-gallon and 55-gallon drums. It is intended for use in high volume applications.

[ondarvr]

Sorry about how that shows up in the post, there were some graphs on bonding and interlaminar shear, but they didn't show up.

It can be purchased from Composites one.

[ahender]

Thank you!

Is this a product that you use, and if so, do you worry about spraying "too much" on your materials.

I will be using this to secure both carbon and a balsa core on a canoe mold with lots of tumblehome.

Alan