Properties

  • Highly chemically reactive due to functional group
  • Forms tough, transparent membranes from water solution.
  • Adding specific waterproofing / cross-linking agents (such as glyoxal), followed by air drying and heat treatment, produces highly water- and hydrothermal-resistant films.
  • Excellent water-resistant adhesion.
  • Forms all types of metallic ions and chelate.
  • Effective emulsifier or dispersant due to surface activity and protective colloid properties. In particular, it dramatically improves the water resistance of Polyvinyl Acetate emulsion.
  • Excellent formaldehyde adsorbing properties.

Applications by Grades

Emulsifier

By using GOHSENX Z as an emulsion protective colloid agent for vinyl acetate-based emulsion, a unique emulsion will be obtained. This will have a higher degree of water-resistant bond strength, unachievable with standard PVOH products.

Coating Agent

The demand for GOHSENX Z is increasing for applications to coated and non-coated paper products requiring a higher degree of water resistance. As a coating agent for thermal printing paper and ink jet printing paper, GOHSENX Z has been extremely popular.

Adhesive and Binder

GOHSENX Z excels in adhesion to various materials with outstanding water resistance properties. We are currently expanding the scope of applications of GOHSENX Z products.

Typical Cross-Linking Agents used with GOHSENX Z
Group Typical Examples
Compound Parts Pot Life
Amine compounds Ethylenediamine 0.1   ~   5phr 2hrs. or shorter
Aldehyde compounds
Methylol compounds
Glyoxal
Water-soluble melamine resin
0.1   ~   5phr
0.1   ~   5phr
2hrs. or longer
2hrs. or longer
Epoxy compounds
Isocyanate compounds
Polyfunctional epoxy resin
0.1   ~   5phr
24hrs. or longer
Multivalent metal salts
(Al, Ti, Zr, Mg, etc.)
Al 2 (SO 4 ) 3 1   ~   5phr 24hrs. or longer
Resistance of Film to Heat and Water
Sample Test no. 1 2 3 4 5 6
PVOH Z-200 (part)
NM-11 (part)
100 100 100 100 100 100
Waterproofing
agent
Water-soluble melamine resin (part)
Glyoxal (part)
5

5

5

5

Hydrothermal
resistance
Elution rate (%)
Degree of swelling (times)
100
17
11
8
3
100
100
100
(Test method)
Film formation: Thickness 40 mm, heat treatment at 100 degree C for 15 min. after 2 days of air-drying.
Hydrothermal resistance: Elution rate (%) after hot water soaking at 80 degree C for 1 hr.
Examples of Emulsion Incorporating GOHSENX Z
Emulsion NO. 1 2 3 4
Polymerization
Recipe
Z-210(parts)
Z-220(parts)
N-300(parts)
GM-14(parts)
4



3



5



3
Vinyl acetate (parts)
Water (parts)
Polymerization initiator
36
60
APS
37
60
APS
45
50
HPO/TA
47
50
APS
Properties Evaporation residue (%)
Viscosity(mPa•s,25 degree C)
pH
Apparent graft ratio (%)
Freeze-thaw stability
(number of cycles)
Water proof adhesion test
40
15,600
4.3
76.1
5<

13hr

40
27,300
4.2
76.1
5<

95hr

50
13,000
4.5

0

×

50
53,000
4.0
42.3
5<

×

NOTE   1) APS: Ammonium peroxosulfate

 

2) Apparent graft ratio: An emulsion film was air-dried at 20 degree C, treated with acetone at 40 degree C for 8 hours and with hot water at 80 degree C for 8 hours, and the extraction-residue was calculated.

 

3) In the water proof adhesion test, an emulsion was applied to faces of birch specimens being glued at a coating weight of 100 g/m². The specimens were glued together and pressed for 24 hours at 200 gf/cm². After removal of the pressing force, the resultant sample was allowed to stand for 24 hours. This sample was used as a test piece. The test piece was immersed in boiling water and the time elapsed until the bonded faces came apart was measured.
Properties of Polyvinyl Acetate Emulsion using GOHSENX Z as an Emulsifier
Mixing ratio Emulsion properties G.f( % )
Viscosity S.V.I Solids
( Poise ) ( % )
Z-200: 4 parts Initiator (APS): 0.08 parts 120 0.5 40 73
VAC: 36 parts Buffer (NaOAc): 0.02 parts
Pure water: 60 parts  
Z-100: 5 parts Initiator (APS): 0.08 parts 23 0.3 50 69
VAC: 45 parts Buffer (NaOAc): 0.02 parts
Pure water: 50 parts  
Viscosity:  Brook field viscometer, 10 rpm, 25 degree C
S.V.I:  Obtained by log (viscosity at 2.5 rpm/viscosity at 20 rpm) ÷ 0.903
Solids:  Obtained by drying samples for 3 hrs. at 105 degree C
G.f (%):  Grafting ratio
 Obtained from residual rate.
 After extracted Em film with warm Acetone followed by hot water.
 cf) G.f of GM-14 use Em. (55% solids) is 40-50%.

Properties

  • Highly chemically reactive due to functional group
  • Forms tough, transparent membranes from water solution.
  • Adding specific waterproofing / cross-linking agents (such as glyoxal), followed by air drying and heat treatment, produces highly water- and hydrothermal-resistant films.
  • Excellent water-resistant adhesion
  • Forms all types of metallic ions and chelate.
  • Effective emulsifier or dispersant due to surface activity and protective colloid properties. In particular, it dramatically improves the water resistance of Polyvinyl Acetate emulsion.
  • Excellent formaldehyde adsorbing properties.
Product Grades and Technical Data for GOHSENX Z
Product Grade Saponification Degree
(mol%)
Viscosity a)
(mPa•s)
pH b) Volatile Matter
(%)
Applications
Z-100 98.5   ≤ 4.5   ~   6.0 3.5   ~   5.0 7.0 or less Thermal recording paper
Z-200 99.0   ≤ 11.5   ~   14.0 3.5   ~   5.0 5.0 or less Thermal recording paper
Z-210 95.0   ~   97.0 11.5   ~   15.0 4.0   ~   5.0 5.0 or less Emulsifier for vinyl acetate
Z-320 92.0   ~   94.0 19.0   ~   24.0 3.5   ~   5.0 5.0 or less Water based polymer-isocyanate adhesives
Z-220

Z-410

90.5   ~   92.5

97.5   ~  98.5

11.5   ~   15.0

50.0   ~  58.0

4.0   ~   5.0

3.5   ~  5.5

5.0 or less

5.0 or less

Emulsifier for vinyl acetate emulsion

Thermal recording paper

a) Viscosity of 4% aqueous solution at 20 degree C    
b) 4% aqueous solution

Dissolution and Storage

Dissolving GOHSENX Z

GOHSENX is charged into room temperature water while stirring. The water is heated immediately with constant stirring, and kept at 90 to 95 degree C for 30 to 60 minutes.

Storing GOHSENX Z

The properties of a GOHSENX Z aqueous solution may change (e.g. its viscosity may increase) if it is stored for long periods of time. Color changes or increased viscosity may also be induced by rust or metallic ions entering the solution.

Note

  • When mixing with defoaming agents, anticorrosives, antiseptics or other chemicals, follow the directions given for handling these chemicals.
  • Avoid storage in hot, humid areas as the product may incur blocking or its properties may change.
    GOHSENX Z will maintain its properties and stability if stored at moderate temperatures.
  • However, its functional group makes it highly chemically reactive, and introducing other chemicals into the product may result in its becoming insoluble or saponified.
Comparison of Effluent Water Loads of Water Soluble Polymer
Polymer COD (mg/kg)x104 BOD5 (mg/kg)x102
GOHSENX Z 99 70
GOHSENOL 60 ~ 100 50 ~ 100
Corn Starch 36 7,400
  • Measuring conditions: Sample concentrations mean pure material concentrations.
  • COD was measured by potassium permanganate method (JIS K 0102), and BOD 5   means the BOD value of over 5 days.
  • Measurement: Registration No. of measurement certification enterprise, Osaka No. 10013, KK Osaka Environmental Technology Center.

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