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.

Grades List

Product GradesSaponification
Degree (mol%)
Viscosity*1
(mPa.s)
pH*2Volatile
Matter (%)
Applications
Z-100Min 98.54.5-6.03.5-5.0Max 5.0Thermal recording paper
Z-200Min 99.011.5-14.03.5-5.0Max 5.0Thermal recording paper, Adhesives
Z-200HMin 99.011.5-14.5-Max 5.0Thermal recording paper
Z-205Min 99.011.5-14.03.5-5.0Max 5.0Thermal recording paper
Z-21095.0-97.011.5-15.04.0-5.0Max 5.0Emulsifier for vinyl acetate
Z-220 90.5-92.511.5-15.04.0-5.0Max 5.0Emulsifier for vinyl acetate
Z-300 98.0-99.024.0-30.03.5-5.0Max 5.0Thermal recording paper, Adhesives
Z-32092.0-94.019.0-24.03.5-5.0Max 5.0Water based polymer - isocyanate adhesive
Z-41097.5-98.543.5-58.53.5-5.5Max 5.0Thermal recording paper
*1: Viscosity of 4% aqueous solution at 20 degree C
*2: 4% aqueous solution

Applications

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.

Cross-linking Reaction

Recommended Cross-linker (Safelink SPM-01)
Safelink SPM-01 is a new cross-linking agent for GOHSENX™ Z developed by our own technique. Both type of powdered and 10% aqueous solution are available.

Characteristics

  • Excellent cross-linkability for GOHSENX™ Z
  • High safety with less toxicity compared to other cross-linking agent
  • Easy handling with longer pot life after mixed with GOHSENX™ Z
  • Excellent color stability against heat and aging conditions
Cross-linking Agent Amount (parts) pH Elution rate*1(%) Pot life*2 YI*3
Safelink SPM-01 5 5.0 3 More than 7 days 4
Glyoxal 1 4.4 6 7 days 12
*1: Dry film (heat treated for 5 min at 70 degree C) after soaking in 80 degree C water for 1 hr.
*2: Period of reaching viscosity of 7% aqueous solution to twice at 23 degree C.
*3: After 100m film left for 7 days at 40 degree C, 90%RH. (NIPPON DENSHOKU &Sigma90)

Other Cross-linkers

Cross-linker Product name Chemical name Product company Addition*1 ph Elution rate*2 (%) Pot Life*3 (hr)
Amine MXDA Methaxylenediamin MITSUBISHI GAS CHEMICAL COMPANY, INC. 3 10.5 20 0.1
1,3-BAC 1,3-bis (aminomethyl)cyclohexane 3 10.5 20 0.1
Hydrazide ADH Adipoyldihydrazide Otsuka Chemical Co., Ltd. 3 5.4 1001) 0.1
APA 280 3 5.4 15 0.1
Aldehyde SEQUAREZ 755 Polyol Carbonyl Adduct OMNOVA Solutions Inc. 3 4.3 10 9
Metal Salt ZIRCOZOL ZC-2 ZrO(OH)ClnH2O DAIICHI KIGENSO KAGAKU KOGYO CO., LTD. 3 1.9 3 Min.168
ZIRCOZOL AC-7 (NH4)2ZrO(CO3)2 3 4.8 202) Min.168
*1 : Additive volume(Parts) / Z-200
*2 : After soaking dry film pretreated 70 degree C x 5min in 80 degree C water for 1hr
*3 : Measure period until 10% aqueous solution viscosity would be twice than initial viscosity as 40 degree C
1) : insoluble in cold water
2) : Elution rate at 90 degree C

Cross-linking Property by UV Irradiation


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.

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(mPas,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

x

50
53,000
4.0
42.3
5<

x

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/m. The specimens were glued together and pressed for 24 hours at 200 gf/cm. 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 (mPa.s) S.V.I. Solids (%)
Z-200: 4 parts Initiator (APS): 0.08 parts 12,000 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 2,300 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%.

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.

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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