WHAT IS THE CHARACTERISTICS OF POLYVINYL BUTYRAL PVB RESIN?

Polyvinyl Butyral PVB resin is a polymer compound obtained by the reaction of polyvinyl alcohol and butyraldehyde under strong acid catalysis.

1. General features:

The appearance of Polyvinyl Butyral PVB resin is white spherical porous particles or powder, and its specific gravity is 1:1; but the filling density is only 0.20~0.35g/ml.

2. Thermal properties:

The glass transition temperature (Tg) of Polyvinyl Butyral PVB resin ranges from 50°C with low coincidence degree to 90°C with high coincidence degree; this glass transition temperature can also be adjusted by adding an appropriate amount of plasticizer to lower it below 10°C .

3. Chemical properties:

The coating film of Polyvinyl Butyral PVB resin has good water resistance, oil resistance and oil resistance. Because PVB contains high hydroxyl groups and has good dispersibility for pigments, it is widely used in printing inks and coatings. In addition, PVB resin has good adhesion to glass, metal, plastic, leather and wood.

4. Security properties:

Pure PVB is non-toxic and harmless to the human body, and ethyl acetate or alcohols can be used as solvents, so Polyvinyl Butyral PVB resin is widely used in printing inks for food containers and plastic packaging in European and American countries.

5. Storage:

As long as Polyvinyl Butyral PVB resin is not in direct contact with water, it can be stored for two years without affecting its quality; PVB should be stored in a dry and cool place, and avoid direct sunlight, and avoid heavy pressure when storing PVB.

6. Dissolution properties:

PVB is soluble in solvents such as alcohols, ketones, and esters. The solubility of various solvents depends on the composition of PVB's own functional groups. Generally speaking, alcohol solvents are easy to dissolve, but methanol is more insoluble in those with high acetal groups; those with higher acetal groups are easier to dissolve in ketone solvents and ester solvents; PVB is easy to dissolve in alcohol ethers Solvents; PVB is only partially soluble in aromatic solvents such as xylene and toluene; PVB is insoluble in hydrocarbon solvents.

7. Polyvinyl Butyral Viscosity characteristics of PVB resin solution:

The viscosity of Polyvinyl Butyral PVB resin solution is greatly affected by the solvent formula and the type of solvent; generally speaking, if alcohol is used as a solvent, the higher the molecular weight of the alcohol, the higher the viscosity of the PVB solution; generally speaking, Under the same solvent and the same content of each group, the higher the degree of polymerization, the higher the solution viscosity; under the same solvent and the same degree of polymerization, the higher the acetal group or acetic acid group, the lower the solution viscosity.