Pressure Sensitive Adhesive (PSA) CEMEDINE BBX 909

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.
• BBX909 (moisture-curing type) and BBX-UV300 (UV-curing type) are available.

  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 (or UV radiation) 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 (or UV radiation) 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

  BBX-UV300: Peel strength

  (N/25mm)

  Adherends	Peel strength
  Stainless steel	14.6
  Aluminum	14.4
  Acrylic	11.5
  Polycarbonate	11.9
  Polystyrene	15.2
  ABS	15.4
  6-Nylon	14.2
  Hard vinyl chloride resin	14.1
  Polyethylene	5.5
  Polypropylene	11.3
  Glass	13.3

  The adhesive was applied to the PET film at a thickness of 100 μm, then bonded to another adherend after UV radiation.
  Lamp: Metal halide lamp
  Cumulated amount of light: 3000mJ/cm2

  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	BBX-UV300
  Application / Properties / Features			Moisture curing type	UV-curing type / RoHS-compliant
  Type			One-part elastic adhesive	One-part UV curable elastic adhesive
  Base			Acrylic modified silicone resin	Acryl
  Appearance			Light yellow transparent paste	Light yellow clear liquid
  Nonvolatiles		wt%	94
  Viscosity		Pa･s/23°C	26	55
  Density		g/cm3	0.97	1.03
  Tack development time		23°C	7 min
  Recommended cumulative amount of light *1		mJ/cm2		3000
  180° degree peel strength		N/25mm *2	20
  Adhesion properties	Adhesive strength	N/25mm *3		16.9
  	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	0
  Cured properties	Hardness	Asker C		27
  	Breaking strength	MPa		0.2
  	Elongation at break	%		1425
  Electric Characteristics	Volume resistivity	Ω･cm		4.22 x 1012
  	Surface resistivity	Ω/sq		3.89 x 1013
  	Insulation breakdown voltage	kV/mm		15.1
  	Dielectric constant	100Hz		5.62
  	Dielectric loss tangent	100Hz		0.078
  Capacity			135mL	1kg