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:
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1. |
Excellent protective colloid ability for vinyl acetate monomer |
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2. |
Resilience of dried membrane |
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3. |
Reliable adhesion to cellulose |
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4. |
Mechanical stability associated with polymer colloid
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For these reasons, GOHSENOL is used as a polymerization emulsifier for vinyl acetate emulsion for wood and paper adhesives.
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Generally, the emulsion prepared by using GOHSENOL as an emulsifier has the following features:
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1. |
G Type (partially saponified PVA): Viscosity stability, high thixotropy, and high viscosity with the emulsion |
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2. |
N Type (fully saponified PVA): Water resistance endowment to emulsion film; low thixotropy |
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3. |
A Type (almost fully saponified PVA): Characteristics between those of the above two types (both water resistance and viscosity stability)
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 Standard Grade |
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 : |
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_ Excellent Water Resistance |
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_ No cross-linking agent required |
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_ Mild acidity (pH 4-5) |
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_ No discoloration caused to the wood |
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_ Thixotropic |
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_ Excellent Stability at low temperature and freeze-thaw |
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_ Bonding Strength accelerates under High Temperature |
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_ 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. |
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|
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 |
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* 4% solution at 20 ℃
** The specification of WR-12, 14 are provisional |
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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 |
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 |
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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℃ |
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