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Home   /   Product   /   Polyvinyl Alcohol PVOH®9655

Polyvinyl Alcohol PVOH®9655

LIWEI CHEMICAL CO. LTD

Specifications

Appearance

Slightly Yellow grains solid

Total Solids wt%(min)

97.0

Degree of Hydrolysis (mole %)

95.0±1.5

Viscosity@20°C,4% solution (mPa.s)

55.0±4.0

Ash Content (as Na2O) wt% (max)

0.4

pH value

5.0-7.0

 

 

 


Packing & Storage

Packing

In 20kg paper bag.

Storage Powder 20°C 2 years; Floccule 20°C 2 years.
Shipping Room temperature 5-30℃ in China; may vary elsewhere
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Frequently Asked Questions

GENERAL INFORMATION

PVOH®9655 is a 96.0mole% hydrolyzed, polyvinyl alcohol which has been specially developed for use as a primary suspending agent for vinyl chloride suspension polymerisation. Using our exclusive batch process which in that it allows more efficient control over the degree of hydrolysis and particle size of product. PVOH®9655 has high molecular weight and high viscosity in the grade.

USES

Specifically, PVOH®9655 is a suspending agent for suspension polymerisation of vinyl chloride monomer (VCM).

STORAGE

1.PVOH®9655 should be stored away from wet areas and naked flames. Ingress of moisture should be avoided to maintain product quality.
2.As supplied, the product should remain fit for use for 12 months from the date of delivery. Beyond that date, the material may still be fit for use, but we would advise that it is good practice to test the material. As such, we advise that material stored for 12 months or more after delivery should be tested before use.
3.Aqueous solutions of PVOH®9655 if stored for long periods at elevated temperatures are prone to mould and bacterial attack.

FOR USED IN VCM SUSPENDING POLYMERISATION

PVOH®9655 has an influence on the PVC resin grain size distribution, porosity and bulk density. This is due to the products surface active nature, reducing the interfacial tension and enhancing distribution of initiator throughout the batch.
The principal advantages of using PVOH®9655 can be summarized as follows.
1.The PVC grains made with PVOH®9655 tend to be more spherical such that higher bulk density may be combined with minimum reduction in porosity and with optimum flow characteristic.
2.The combination of PVOH®9655 and PVOH®725 or secondary suspending agent grades give PVC resins of narrow grain size distribution and a good balance of bulk density and porosity.

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