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Technical Information by Appication
Emulsion Stabilizer Applications

Having both a hydrophobic and a hydrophilic group within its molecule, GOHSENOL performs excellently as an emulsifier for synthetic resin emulsions. In particular, it has the following advantages over other surfactants on the market:

1.
Excellent protective colloid ability for vinyl acetate monomer
2.
Resilience of dried membrane
3.
Reliable adhesion to cellulose
4.
Mechanical stability associated with polymer colloid

For these reasons, GOHSENOL is used as a polymerization emulsifier for vinyl acetate emulsion for wood and paper adhesives.

Generally, the emulsion prepared by using GOHSENOL as an emulsifier has the following features:

1.
G Type (partially saponified PVA): Viscosity stability, high thixotropy, and high viscosity with the emulsion
2.
N Type (fully saponified PVA): Water resistance endowment to emulsion film; low thixotropy
3.
A Type (almost fully saponified PVA): Characteristics between those of the above two types (both water resistance and viscosity stability)


Standard Grade

Water resistance of emulsion membrane



Correlation between Emulsion Viscosity and PVOH Saponification at a Low Temperature




Speciality Grades for Water Proof Emulsion

Introduction of GOHSEFIMER WR

GOHSEFIMER WR is a newly developed range of products designed for the production of water-proof polyvinyl acetate emulsions.
The use of Gohsefimer WR in polyvinyl acetate emulsions can produce D3 1-component systems, with no cross-linking agent required.

Advantages of GOHSEFIMER WR based polyvinyl acetate emulsions :
  _ Excellent Water Resistance
  _ No cross-linking agent required
  _ Mild acidity (pH 4-5)
  _ No discoloration caused to the wood
  _ Thixotropic
  _ Excellent Stability at low temperature and freeze-thaw
  _ Bonding Strength accelerates under High Temperature
  _ Long shelf life

These high quality emulsions can be used in the production of adhesives and for paints, however they are also suitable for other applications which require particularly high water resistance.

Specification of GOHSEFIMER WR
Grade
Hydrolysis
(mol % )
Viscosity*
(mPa•s)
Volatiles
(%)
Application
WR-12** 92.0-95.0 4.5-6.0 < 5.0 Protective colloid
WR-14** 90.5-93.0 6.0-7.5 < 5.0
* 4% solution at 20 ℃
** The specification of WR-12, 14 are provisional




Properties of Emulsions
   
WR-12
WR-14
Recipe
(parts)
PVOH 10 10
Vinyl Acetate 100 100
Water 121 121
Emulsion Properties Solids 48 48
Viscosity 4,000 19,000
PH 4-5 4-5
Freeze-thaw stability (times) > 5 > 5
Applicable for D3




Adhesive Strength of GOHSEFIMER WR based emulsion
Required Bonding Strength (N/mm2)
Condition and Duration
D3
Requirement
WR-14 Based
Wood Adhesive
> 10 15.6 7 days standard atmosphere, 65%RH, 20℃
> 2 3.4 7 days standard atmosphere, 65%RH, 20℃
4 days in water at 20℃
> 8 15.0 7 days standard atmosphere, 65%RH, 20℃
4 days in water at 20℃,
7 days standard atmosphere, 65%RH, 20℃
Tested by FIRA International Limited




Summary of PVOH for PVC emulsion




  1. Characteristics of GOHSEFIMER Z type Application examples for emulsifier
  2. Example of Polymerization of vinyl acetate using GOHSERAN L-3266
  3. Example of Polymerization of Vinyl Acetate using GOHSENAL T
  4. Example of Polymerization of Vinyl Acetate using GOHSEFIMER K-210
  5. Tested by FIRA International Limited
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