VAMA Vinyl Resin equivalent to Dow VMCH

Characteristice: A high molecular weight resin containing approximately 86 percent vinyl chloride, 13 percent vinyl acetate, and 1 percent maleic acid. Because of the carboxyl functional group, VAMA has excellent adhesion on metal, especially on aluminum foil, the resin foil also has a good adhesion on PVC , ABS, paper, textiles, beton, etc. At the same time, VAMA has good water resistance, excellent oil, ester, acid, alkali and salt water solution resistance.

Solubility: VAMA is usually dissolved in relatively strong solvent/ diluent combinations, such as ketone/ aromatic diluent ( 50/ 50 percent by weight) , to produce solutions of 22 to 25 percent solids. Ketones and esters is the most commonly used solvents, and chlorinated hydrocarbons, amide used only in a few occasions. Ketones is a particularly good solvent, and esters is the relatively weak solvent. Chlorinated hydrocarbons such as dichloroethane and 1, 2 - dichloroethane can completely dissolve VAMA, and methyl chloroform and tetrachloroethane can only swell it. Aromatic hydrocarbons have a good role in the swelling, generally using with ketone.

Application: VAMA is used primarily for air-dry finishes, such as maintenance, marine and metal coatings, aluminum foil varnish, cans sealed paint, shoe adhesive, floor paint, cement paint, silk screen printing and transfer ink. VAMA often mixes with LC-40, used in the production of heat sealing packaging coatings, can effectively reduce the heat sealing temperature, raise the heat sealing strength. It also can be used to produce the VC sealing plastic package, Electro-chemical aluminum paint, thermal transfer adhesive.

VAMA Vinyl Resin Quality standard ( XHQB-6)
No. Item Index Test method
1 Appearance White powder By visual
2 Whiteness e80 GB2913-82
3 Composition % by Wt Vinyl Chloride 86± 1% GB/ T7139-2002
Vinyl Acetate 13± 1% ISO1159-1978
Maleic Acid 1± 0.2%
4 Reactive Functionality ( Carboxyl % ) 1± 0.2%
5 K Value 44-46 GB/ T3401-1999
6 Viscosity No. ml/ g 50-54 GB/ T3401-1999
7 Glass Transition Temp  About 72 GB11998-89
8 Average Molecular Wt About 27000 Calculated by the Viscosity No.
9 % by wt, through 60 mesh 100% GB/ T6003.1
10 Apparent density ( g/ ml) e0.5 GB20022-2005
11 Volatilization ( % ) d1% GB/ T2914-1999
12 Impurity Particle No. / 100g d20 GB9348-88
13 25% resin in MEK/ Toluene( 50/ 50) Colorless and Transparent By visual