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Specialty Grades

Reactive PVOH Z Series

GOHSENX Z Series

Z Series is a specially modified PVOH containing a reactive acetacetyl group in its molecule.

Structural formula

Structural formula Z series

Properties
  • ・Cross-linked by various methods
  • ・Adding a cross-linking agent
  • ・Self cross-linking by thermal treatment
  • ・UV cross-linking (in a hydrous or aqueous solution state)
  • ・Functions as a protective colloid and a surfactant
  • ・Adheres well to polarized surfaces
  • ・Enables to form chelate
  • ・Easy to unchain cross-linking by alkaline
Product Grades and Technical Data for GOHSENX™ Z
Product Grade Saponification Degree
(mol % )
Viscosity ※1
(mPa・s)
pH ※2 Volatile Matter
( % )
Applications
Z-100
98.5 or higher
4.5~6.0
3.5~5.0
5.0 or less
Thermal recording paper
Z-200
99.0 or higher
11.5~14.0
3.5~5.0
5.0 or less
Thermal recording paper
Z-205
99.0 or higher
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 Em
Z-220
90.5~92.5
11.5~15.0
3.5~5.5
5.0 or less
Emulsifier for vinyl acetate Em
Z-300
98.0~99.0
24.0~30.0
3.5~5.0
5.0 or less
Adhesive
Z-320
92.0~94.0
19.0~24.0
3.5~5.0
5.0 or less
Water based vinyl urethane
Z-410
97.5~98.5
43.5~58.5
3.5~5.5
5.0 or less
Binder

※1. 4% aqueous solution at 20℃
※2. 4% aqueous solution

Applications of GOHSENX™

Emulsifier
When used as an emulsifier for vinyl acetate-based emulsion, the resulting emulsion will have a higher degree of water-resistant bond strength which is not achieved by conventional PVOH products.
Coating Agent
There is an increasing demand for GOHSENX™ Z for coated and non-coated paper products which require a higher degree of water resistance. As a coating agent for thermal printing paper and ink jet printing paper, GOHSENX™ Z is extremely popular.
Adhesive and Binder
GOHSENX™ Z excels in adhesion to various materials and has outstanding water resistance. We are currently expanding the scope of adhesive and binder applications.

Recommended crosslinker(Sefelink SPM-01)

Safelink ™ SPM-01 is a new crosslinking agent for Gohsenx™ Z developed by our own technique. Both type of powdered and 10% aqueous solution are available.

Characteristics
  • ・Excellent crosslinkability for Gohsenx ™ Z.
  • ・High safety with less toxicity compared to other crosslinking agents
  • ・Easy handling with longer pot life after mixed with Gohsenx Z.
  • ・Excellent color stability against heat and aging conditions.
The performance of Sefelink™ SPM-01)
Cross-linking Agent
Amount
※1
pH Elution rate(%)
※2
Pot life
※3
YI
※4
Safelink™ SPM-01 5 5.0 3 More than
7days
4
Glyoxal 1 4.4 6 7days 12

※1. PVOH/ Z-200
※2. After soaking dry film which is heat treated for 5min at 70℃ in 80℃ water for 1hr
※3. Time needed for 7% aqueous solution at 23℃ to become twice in viscosity.
※4. When 100μm film is left for 7days at 40℃, 90%RH. (NIPPON DENSYOKU Σ90)

フィルム写真

Other Crosslinkers
Agent type
Amount ※1 pH Elution rate
(%)※2
Pot Life
※3
Amine MXDA 3 10.5 20 A few min.
1, 3-BAC 3 10.5 20 A few min.
Hydrazide ADH 3 5.4 100 1) A few min.
APA-280 3 5.4 15 A few min.
Methylol SUMIMALM-30W 3 4.3 14 4hrs
Aldehyde Glyoxal 1 4.4 6 Approx. 1day
SEQUAREZ 755 3 4.3 10 9hrs
Metal Salt ZIRCOZOL ZC-2 5 1.9 3 More than
7days
ZIRCOZOL AC-7 5 8.4 20 2) More than
7days

※1. PVOH/ Z-200
※2. After soaking dry film which is heat treated for 5min at 70℃ in 80℃ water for 1 hr
※3. Time needed for 10% aqueous solution at 40℃ to become twice in viscosity.
1): Film hardly dissolves in cold water is formed
2): Test temp. :90℃

Examples of Emulsions Incorporating GOHSENX™ Z
Emulsion NO. 1 2 3 4
Polymerization Recipe Z-210 (parts) 4
Z-220 (parts) 3
N-300 (parts) 5
GM-14 (parts) 3
Vinyl acetate (parts) 36 37 45 47
Water (parts) 60 60 50 50
Polymerization Iinitiator APS APS HPO/TA APS
Properties Evaporation
Residue (%)
40 40 50 50

Viscosity
(mPa•s, 25℃)

15,600 27,300 13,000 53,000
pH 4.3 4.2 4.5 4
Apparent Graft
Ratio (%)
76.1 76.1 - 42.3
Freeze-thaw Stability
(number of cycles)
5< 5< 0 5<
Water-proof
Adhesion Test
13hrs 95hrs × ×

NOTE
(1)APS:Ammonium peroxosulfate
(2)Apparent graft ratio: An emulsion film was air-dried at 20℃, treated with acetone at 40℃ for 8 hrs and with hot water at 80℃ for 8 hrs, and the extraction-residue was calculated.
(3)In the water proof adhesion test, 100g/m2 of emulsion was applied to each face of birch specimens. The specimens were then glued together and pressed for 24 hrs at 200 gf/cm². After depressurizing, the resultant sample was left to stand for 24 hrs. This sample was used as a test piece. The test piece was immersed in boiling water and the time needed for the bonded faces to come apart was measured.

Properties of Polyvinyl Acetate Emulsion using GOHSENX™ Z as an Emulsifier
Mixing Ratio Emulsion Properties G.f
(%) 
Viscosity
(Poise)
S.V.I Solids
(%)
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℃
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℃
G.f(%): Grafting ratio
  An emulsion film was   air-dried at 20℃, Treated with acetone at 40℃ for 8hrs and with hot water at 80℃ for 8hrs,
and the extraction-residue was calculated.
  cf) G.f of GM-14 use Em. (55% solids) is 40-50%.

UV Visible Spectrum of Chelete Complex Absorbance

Dissolution and Storage

Dissolving GOHSENX™ Z
Put GOHSENX™ Z into room temperature water while stirring the water. Heat the water immediately while constantly and continuously stirring the water, and keep it at 90℃ to 95℃ for 30 to 60 minutes until complete dissolution.
Storing GOHSENX™ Z
The properties of a GOHSENX™ Z aqueous solution may change (e.g. its viscosity may increase) if stored for a long period of time. Color changes or viscosity increase may also be induced by rust or metallic ions entering the solution.
Note
  • ・When mixing GOHSENX™ Z with defoaming agents, anticorrosives, antiseptics, or other chemicals, follow the handling instructions of these chemicals.
  • ・Avoid storage in a hot, humid area as the product may incur blocking or its properties may change.
  • ・GOHSENX ™ Z is stable when stored at moderate temperature; however, GOHSENX ™Z has a functional group that makes the product chemically quite reactive, and contamination of other chemicals may cause the product to become insoluble or form gel.
Effluent Water Loads of GOHSENX™ Z
Polymer COD(mg/kg) ×104 BOD5(mg/kg)×102
GOHSENX™ Z 99 70
GOHSENOL 60~100 50~100
Corn Starch 36 7400

Measuring conditions: Sample conc. mean pure material conc.
COD was measured by potassium permanganate method (JIS K 0102), and BOD5 is a 5-day BOD value.
Measurement: Registration No. of measurement certification enterprise, Osaka No. 10013, KK Osaka Environmental Technology Center.



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