polüvinüülbutüül

Polyvinyl butyl, also known as PVB, is a polymer typically used as an interlayer in laminated safety glass. It is a thermoplastic polymer produced by the reaction of polyvinyl alcohol with butyraldehyde. PVB is known for its excellent adhesion, toughness, and optical clarity. Its ability to absorb energy makes it crucial for safety applications, preventing glass from shattering into sharp pieces when broken. This characteristic is vital in automotive windshields and architectural glazing.

The manufacturing process for PVB involves reacting polyvinyl alcohol with butyraldehyde in the presence of an acid catalyst. The resulting polymer is then typically processed into thin films. These films are then sandwiched between layers of glass and heated under pressure in an autoclave, creating a strong bond. The thickness of the PVB interlayer can vary depending on the desired level of impact resistance and acoustic insulation.

PVB's properties also contribute to acoustic dampening, making laminated glass with PVB a good choice for reducing noise transmission. It offers good resistance to UV radiation, although prolonged exposure can lead to some yellowing. PVB is also resistant to many chemicals and solvents. Its versatility has led to its widespread use beyond glass lamination, including in some adhesives and coatings.