PVB laminated glass
PVB is a resin mostly used for applications that require strong binding, optical clarity, adhesion to many surfaces, toughness and flexibility. It is prepared from polyvinyl alcohol by reaction with butyraldehyde. The major application is laminated safety glass for automobile windshields and bulletproof glass.
PVB, polyvinyl butyral, with high transparency, cold resistance, impact resistance, resistance to ultraviolet radiation. PVB is the most widely used laminated material for building glass and automobile glass at present.
Compared with EVA, the storage and processing technology of PVB interlayer is much more complicated. General requirements PVB between when the temperature is 18-23 DEG C, relative humidity 18-23%, PVB moisture (entries "water content" provided by industry Encyclopedia) 0.4%-0.6%, after preheating rolling ("rolling" entries provided by industry Encyclopedia) or vacuum, also need to use an autoclave at 120-130 DEG C, 1.0-1.3MPa insulation the pressure for 30-60 minutes. PVB laminated glass production equipment needs about 1 million.
PVB laminated glass has the advantages of safety, good sound insulation (term "noise" provided by the industry Encyclopedia) resistance and ultraviolet radiation, but PVB water resistance is poor, long-term soaking wet glue is easy to fall off. 7-8 years ago the PVB film with imported DuPont, Solutia, three water factories. In recent years, the development of domestic PVB has been developing rapidly, but most of the domestic manufacturers use recycled materials for two times processing, and the quality stability is relatively poor. The domestic PVB use is not enough from the raw material PVA.
Your cart is currently empty.