Materias Primas

                                           EXPORT LIST - SILICATO DE ALUMINIO - ALCOHOL POLIVINILICO                       

 

ALCOHOL POLIVINILICO

1. Structural formula:

Where n is average polymerization degree, and the molecuilar weight is 44n.

2. General Properties:

 

(1) Appearance: white or cream colored slices or granules.

(2) Density: 0.4-0.5g/ml

(3) Water Solubility:

PVA 17-99 is a water-soluble resin.  The dissolving rate of PVA 17-99 is highly dependent on dissolving temperatures, that is, the higher the temperature, the higher the dissolving rate.  It good film-forming and adhesive properties of it's water-solution.

(4) Chemical stability: It is hardly influenced by weak acid, weak base or normal organic solvents, highly resistant to oil.

(5)Thermostability:

Being softened when heating, stable below 40C, gradually colored above 160C after a long time.  Above 220C begin decompose and generate water, acetate, acetaldehyde, etc.

(6) Storage stability: good storage stability, no moulding or deterioration.

 

3. Main uses:

 

(1) Vinylon raw materials:

Polyvinyl alcohol 17-99 can be processed into vinylon fiber through dissolving, spinning and treating by aldolactol formaldehyde.  Vinylon fiber can be made into vinylon textile by mixing with cotton. wool, viscose fiber. wich is widely used in many industrial fields, such as clothes, tarpaulin, curtain thread, fishnet and rope etc.

 

(2) Textile warp sizes:

The warp sizes, prepared mainly with polyvinyl alcohol, have good adhesive to cotton, fiber of hemp, polyester fiber, viscose fiber, etc. The films are smooth, solid and abrasion resistant, with good tenacious.  It can lower the end breaking rate, with a little dust on wrap sizes and cloths.  For the smaller quantity of the wrap sizes, the cloth have a soft feel and is smoth.  Also the quantity is increased in a bolt of cloth.

 

(3) Ferric processibg agent:

When used as ferric processing agent, it is often mixed with urea and formaldehyde. When heated to a high temperature, irea and formaldehyde react with each other, leading to softly tenacious while increasing the stiff and smooth properties and elasticity.  The stiff and smooth degree of the cloth can be adjusted by changing the quantity of the polyvinyl alcohol.

 

(4) Paper processing agent:

With highly adhesive, good film forming and making for tancious film properties, this product can be used toghether with, or instead of, starches and casein, as pigment binders for coated papers or used as surface sizes for white paper boards, oil-resistant paper, printing paper, Kraft and cellophane.  This can increase the wear, folding and tear resistance of the papers or papers boards, and make them more glossy, smooth, printable and resistant to oils and chemicals.

 

(5) Polyvinyl acetal:

This product can react through acid catalysis with formaldehyle, acetaldehyde or butadehyle into polyvivyl alcohol wich can improve the water-proof, adhesion properties of polyvinyl alcohol.  Aldolactol formaldehyle is widely used in coating, construction adhesion (107 adhesion), sponge, etc.  Aldolactol butadehyle has good ashesion to glass, metal and leather, wich can be used in fields of coating, aluminum foil, copper board and safeglass etc.

 

(6) Paper adhesive:

It's water solution can substitute natural bonding agents (starch, water glass, etc.) asw adhesives in brookbinding, making paper cartoons, paper ropes, paper tubes, paper boxes, etc. It can be used toghether with cheap inorganic filters to save money, such as clay, aluminum oxide, titanium oxide, while to increase adhesive strength.

 

(7) Polyvinyl alcohol films:

PVA films are highly transparent, glossy, highly tensile and of strong tearing strength, and resistant to oils and organic chemicals; have a high moisture permeability and gasproofing property; and free from static charge.  Therefore, they are suitable for textile packing.  Additionally, it can copolymerize with polyvinyl, polypropylene, used in instrument packing or optic fields.

 

 

4. Using method:

As practical using, Huabiao brand polyvinyl alcohol 17-99 should be prepared into solution in most cases.

Dissolving procedures:

 

(1) The dissolving container should be a pot with a stirrer.  The stirring speed should be 70-100 r/min.  The pot should be iron container with lining of stainless steel, enamel or copolymer resin.

 

(2) When dissolving add PVA in cold or room temperature water while stirring; continue stirring for about 20-30 min or more, so that PVA swells amd disperses sufficiently.  (it can be effectively save dissolving time swelling PVA first).  Then raise the temperature to 95C and hold it for 2.5-3.0 hours, until it completely dissolved without tiny pellet.  After removing the impurity by filtering, the solution can be used.

 

(3) Use steam for direct heating to raise the temperature of the solution, or use the water bath method for indirect heating in order to avoid decomposition due to local overheating.  When heating by water stream, add water 10-15% less than usual, due to there will be water condensed in the solution.

 

(4) Foam may develop if the high density PVA 17-99 solution is agitated vigorously.  Foaming can be controlled by adding to the solution defoaming agent such as octanol, tributy 1 phosphate or silicon defoamer agents.

 

(5) Whether or not it is completely dissolved? How to judge?

Take some solution, add 1-2 drops of iodine coulombmeter into it.  If there appear a blue transparent ball, it indicate the PVA 17-99 is not dissolved completely; otherwhise if the color glossy spreads evenly, it indicates it is dissolved completely.

 

5. Package, transportation and storage

 

(1) Packing: Packed in pp woven bag with plyethylene bag lining, with 20 Kg. net per bag.

 

(2) Storing: Storage room should be dry and well ventilated.  Stirct moisture-proof measures should be taken.

 

(3) Transporting: To be handled lighly so as to prevent breaking of package.

 

(4) As the product is flammable, there should absolutely be no open fires in close vecinity.  Can use any firefighting instrument to put out a fire in case of emergency.

 

6. Full Hydrolysis PVA's Specification:

 

Specification

Category Viscosity mPa.s Hydrolysis mol% Sodium Acetate %<= Volatile %<= Ash %<= pH
PVA15-99 18-24 98.0-100 2.1 8.0 0.7 5-8
PVA16-99 19-27 98.0-100 2.1 8.0 0.7 5-8
PVA17-99 25-32 98.0-100 2.1 8.0 0.7 5-8
PVA18-99 28-36 98.0-100 2.1 8.0 0.7 5-8
PVA19-99 35-44 98.0-100 2.1 8.0 0.7 5-8
PVA20-99 36-46 98.0-100 2.1 8.0 0.7 5-8

 

 

 
 
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