Polyvinyl Alcohol Application

Polyvinyl Alcohol products have a wide range of uses. In the textile industry, they are mainly used as yarn pulp, fabric finishing...

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Polyvinyl Alcohol Grades

Polyvinyl Alcohol is manufactured by polymerization of vinyl acetate monomer, followed by hydrolysis of the polyvinyl acetate. HOP...

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Polyvinyl Alcohol Introduction

Polyvinyl Alcohol is a water soluble and biodegradable synthetic polymer. It is adry solid, and is available in granule and powder...

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pva painting

●Good film forming property, without cracking

●Anti-adhesive release effect, even when thinly applied

●Impermeability of PVA film to the organic material used, e.g. styrene

Add 25 ml of N/10 NaOH solution, seal the flask and leave it still for at least 2 hours in room temperature.Add

accurately 25 ml of N/10 H2SO4 solution and titrate back the excess amount of H2SO4 solution present with

N/10 NaOH solution using phenolphthalein as the indicator, until the solution appears in pale pink color.

The volume of N/10 NaOH solution consumed in this titration is a ml. Carry out a blank test separately; the

volume of N/10 NaOH solution consumed in this blank test is b ml.

After swelling, dissolve it completely in a boiling water bath and leave it cool to room temperature. Measure

the viscosity of each solution at 20±0.1°C by Brookfield Viscometer with UL Adapter.Then, measure accurately

the concentration of each solution (Note 1). Report the viscosity (Cps) of 4.00 wt% solution as estimated from

a curve based on the relationship between concentration and viscosity, as follows:

PVA solution of above-mentioned grades can be applied to the mold by brushing or spraying. The viscosity of

the selected grade and concentration determine the thickness of release coating. About 10 to 30 wt % of solid

content is recommended for this purpose. Up to 15% of plasticizer, such as glycerol or ethylene glycol, relatively

to the weight of PVA, can be added to the formulation to improve the flexibility of mold release film.

Polyvinyl alcohol exhibits low acute toxicity to aquatic species.

Fish (Pimephales promelas) 96-hr. LC50: > 40,000 ppm. Fish (Lepomis macrochirus) 96-hr. LC50: >10,000

ppm. Crustacean (Ceriodaphnia dubia) 48-hr. LC50 = 7,850 ppm. Crustacean (Daphnia magna) 48-hr. LC50

= 8,300 ppm. Bacteria (Photobacterium phosphoreum), Microtox Method, EC50: >50,000 ppm.

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