Pressure Sensitive Adhesive (PSA)CEMEDINE BBX Series

Features

  • This is a unique pressure-sensitive adhesive in liquid form that bonds different materials including silicone rubbers and polypropylene with excellent removability.
  • As this elastic pressure-sensitive adhesive comes in liquid form, loss of materials as a result of a die-cutting process and waste such as release papers will not be produced, so you can expect to improve your environmental friendliness and reduce costs significantly.

Mechanism of an elastic pressure-sensitive adhesive

Basic mechanism

This product has two key features: it is an adhesive that sticks firmly, and it is a pressure-sensitive adhesive that never solidifies. The product reacts to moisture contained in air to form a flexible, elastic film.

Secret to an easily peelable adhesive with minimal residue

As this pressure-sensitive adhesive is liquid, its “wetness” enables the surfaces to which it is applied to bond firmly, based on its adhesive property and tackiness property. The surface after open time exposure, however, bonds using the adhesive’s tackiness property only because the remaining adhesive property solidifies in reaction to the moisture contained within air. As a result, the adherend may be peeled from the tacky surface, which has a relatively smaller adhesion strength. In addition, since a resilient, highly stretchable elastic layer is formed, the adhesive may be peeled off neatly from the interface without cohesion failure. Although there are some exceptions, basically, BBX remains on the surface on which it was first applied.

How BBX bonds slightly rough surfaces

As BBX is liquid, if you apply it onto a rough surface, it will spread over the uneven texture, securing an effective application area. However, if you apply the adhesive onto a smooth surface and then bond it to a rough surface after curing, BBX will not spread sufficiently over the uneven texture, compared to when the adhesive was in a liquid state, because the adhesive surface after the curing reaction turns into a semisolid tacky surface (like the surface of double-sided tape). Nevertheless, as BBX does not use a base material like that of a tape, and the pressure-sensitive adhesive forms a resilient layer, if you apply the adhesive thickly, you can expect to increase the effective contact area compared to that of tapes in general, achieving a greater sticking force.

How to develop tackiness quicker

Basically, the tackiness can be developed quicker under these conditions: thin-film application, high temperature, and high humidity.

Adhesion performance data (JIS Z0237)

BBX909: Peel strength

(N/25mm)
Adherends Peel strength
Silicone rubber 18
Natural rubber 35
SBR 22
Chloroprene rubber 7
Urethane rubber 18
EPDM 11
Leather 18

The adhesive was applied to one side of the adherend, and then bonded to another adherend after 1 minute of open time.
Surface preparation: Treated using sandpaper, and degreased with solvent
Adhesive thickness: 100μm  
Curing: 23°C 50%RH for 28 days after curing
Tension speed: 300 mm/min

BBX909: Tack development time

Environmental condition Tack development time
40°C 65%RH 3 min
23°C 50%RH 7 min
5°C 40%RH 30 min

Standard: Time required to achieve a 180º peel strength of 5 N/25 mm or greater.

BBX909: Changes in peel strength according to different open times

(N/25mm)
Open time 40°C 65%RH 23°C 50%RH 5°C 40%RH
Immediately following After 28 days Immediately following After 28 days Immediately following After 28 days
3 min 8 16 - 15 - 9
7 min 12 19 6 17 - 9
30 min 19 21 7 20 6 9
120 min 20 22 15 22 9 19

Adherends: PET film x Stainless steel
Adhesive thickness: 100 μm coating (single side on stainless steel side)

BBX909 tack property

Open time condition Inclined ball tack
23°C 50%RH 30 min later 17
After 24 h 22

BBX909 holding power

Adherends Displacement
Stainless steel x PET film 40°C 0mm
80°C 0mm

The adhesive was applied to one side of the PET film, then bonded to a stainless-steel adherend after 30 minutes of open time.
Adhesive thickness: 100 μm
Application area: 25mm x 25mm
Test method: The materials were left in an environment under each temperature for 60 minutes, under 1-kg load. The displaced distance, or the time until the PET film dropped was measured.

Stickiness of BBX909 to olefin resin

(N/25mm)
Adherends PET side coating Applied to adherend
PE x PET film 9 14
PP x PET film 12 10

The adhesive was applied to one side of the PET film, then bonded to a stainless-steel adherend after 30 minutes of open time.
The adhesive was applied to one side of the adherend, then bonded to PET film after 30 minutes of open time.
Adhesive thickness: 100 μm
Test method: JIS Z0237, 23°C50%RH 4 W curing

Product data

Property

BBX909
Application / Properties / Features Moisture curing type
Type One-part elastic adhesive
Base Acrylic modified silicone resin
Appearance Light yellow transparent paste
Nonvolatiles wt% 94
Viscosity Pa・s/23°C 26
Density g/cm3 0.97
Tack development time 23°C 7 min
Recommended cumulative amount of light *1 mJ/cm2
180° degree peel strength N/25mm *2 20
Adhesion properties Adhesive strength N/25mm *3
Stickiness (PET film x Stainless steel) Ball No. *4 17
Ball No. *5 22
Holding power (PET film x Stainless steel) mm/1kg・80°C *6 0
Cured properties Hardness Asker C
Breaking strength MPa
Elongation at break %
Electric Characteristics Volume resistivity Ω・cm
Surface resistivity Ω/sq
Insulation breakdown voltage kV/mm
Dielectric constant 100Hz
Dielectric loss tangent 100Hz
Capacity 135mL
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Description of the markexplanation

*1 Metal halide lamp (illumination intensity: 500 mW/cm2)
*2 Adherend: PET film x stainless-steel; Application thickness: 100 μm (on the stainless-steel side only)
Open time of 30 minutes at 23°C 50%RH, after 28 days
*3 JIS Z 0237 2008 (measuring width 25 mm)
*4 23°C 50%RH Open time 30 min
*5 23°C 50%RH Open time after 24 h
*6 How test samples were created: The product was applied to one surface of a PET film, and the film was attached to a stainless material after 30 minutes of open time
Application thickness: 100 μm, adhesion area: 25 mm X 25 mm
Testing method: The film was left for 60 minutes at 80°C under a load of 1 kg, and the distance of deviation, or the time until the PET film dropped from the test sample was measured.