FINASTAT
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FINASTAT RANGE
OF ANTI-STATIC AGENTS
Most plastics are good electrical insulators and therefore tend to acquire a strong electrostatic charge which may cause difficulties and malfunctions and can also be dangerous. The electrostatic charge results from the splitting of positive and negative charges that occur when two surfaces are separated after a close initial contact. This can happen, for example, during the mould release of polyethylene bottle, PVC profiles leaving the extruder nozzle, polystyrene cups during hot-forming or ABS components on removal from the extrusion die. The charge prevailing on the surface of the plastic is further increased during the operations that follow for example conveyor belt transport, stacking, foil winding, packaging etc.
Antistatic agents offer the possibility of avoiding electrostatic charging by causing a fast discharge of the plastic's surface.
Depending on the method of application, a distinction is made between "Internal and External" antistatic agents. The internal antistatic agents are added to the plastic materials during or before treatment. From the interior of the object they migrate to the surface and reduce the surface resistance, partially with the action of moisture absorbed from the ambient air On the other hand, external antistatic agents are distributed on the surface of the plastic article after processing usually dissolved in water or a suitable organic solvent. The disadvantage of external application is the limited duration of effect because the antistatic action is excluded by abrasion or washing.
An important requirement for the effectiveness of an antistatic agent is it's limited compatibility with the polymer concerned and controlled mobility (rate of diffusion) in the matrix.
An important requirement for the effectiveness of an antistatic agent is it's limited compatibility with the polymer concerned and controlled mobility (rate of diffusion) in the matrix.
How do antistats work?
Antistats have the ability to absorb moisture. When the antistats are incorporated into the polymer an electrically conductive film is formed on the surface of the polymer allowing for the static charges to dissipate. Their mechanism consists of a hydrophobic end which ensures that the antistat is attached to the polymer surface and a polar end which absorbs the water molecules thus ensuring the electrical conductivity.
For permanent static control, antistats are incorporated into the molten polymer. This results in a reduction of the surface resistivity in polyolefins to as low as 10 9 ohms. The antistat must be sufficiently surface active to migrate to the surface of the material where it is needed. The polymer serves as a reservoir of antistat so that as material is wiped or washed from the surface, more antistat migrates upto the surface to replace it. Relative humidity is very important when dealing with static electricity The surface resistivity (which is the resistance by the surface to the flow of an electrical current) will decline as the relative humidity increases. For example, in many electrical and electronic applications, surface leakage paths are critical. Such paths usually involve absorption of moisture on the surface from the atmosphere. Thus, the surface resistivity must be measured in a humidity-controlled atmosphere and a knowledge of that humidity is essential for interpretation and use of the electrical test data.
Oleofine Organics produce a range of antistatic agents to meet the specific requirements of plastics compounders and end- users. These FINASTAT range of antistatic agents are internal and / or external types.
FINASTAT - 9500
FINASTAT 9500 is suitable as an antistatic
agent for polyolefins, PVC and expanded
polystyrene (EPS)
DESCRIPTION
Nitrogen free
oleochemical
derivative
TYPICAL PROPERTIES
  • 1. Appearance:
  • 2. Acid Value
  • 3. Iodine Value:
  • 4. Melting Point:
  • 5. Flash Point:
  • Fine beads/powder
  • 3 max.
  • 3 max.
  • 68º C + 5º C
  • above 280º C
PROPERTIES
  • 1. Rapid action - powerful antistat
  • 2. Ensures rapid mould filling
  • 3. Improved cycle times
  • 4. Easy release
  • 5. Outstanding thermal stability
  • 6. No yellowing / discolouration
  • 7. High polarity permits low usage levels
USE LEVEL
  • 0.1% to 0.5% for LDPE / LLDPE films
  • 0.2% to 0.5% for PP films
  • 0.3% to 2.0% for PP injection/HDPE moulded items
  • 0.5% to 1.0% for EPS moulding
  • 0.5% to 1.0% for plasticized PVC
  • 3.0% to 5.0% for rigid PVC
METHOD OF USE
  • 1. By preparing a masterbatch.
  • 2. By blending FINASTAT-9500 with the polymer prior to extrusion/ moulding.
Sprinkle calculated quantity of FINASTAT-9500 (powder) over the polymer granules in a tumbling mixer and mix well for 20 - 30 minutes until powder is coated on the polymer granules. Homogeneously disperse additive powder will show distinct results. A possible use of little quantity of liquid wetting agents or liquid antistats can also be made to wet the polymer granules before sprinkling FINASTAT-9500 powder.
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