The molecular structure of PVB determines its comprehensive properties such as high tensile strength, impact resistance, transparency and elasticity, which are incomparable with other polymers. PVB is mainly used in safety glass sandwich materials, and also widely used in special coatings, adhesives, ceramic printing paper, aluminum foil, etc. The figure shows the consumption distribution of Pvb Resin at home and abroad in recent years.
Used as intermediate film for safety glass
PVB Resin has excellent optical clarity, and its refractive index is close to that of glass. The image picked up through the laminated glass will not appear optical distortion and double phase, which can ensure clear line of sight; Good weather resistance, can maintain no deformation in a large temperature range: with the combination of flexibility of stiffness and excellent impact resistance; Excellent adhesion efficiency with various glass surfaces. Therefore, the high molecular weight PVB resin is added with 20% - 40% Plasticizer, extruded into a film, and firmly combined under heating and pressure to make safety glass. When the outer glass is broken. It only forms an irregular crack (radial when shooting), and the fragments are still firmly adhered to the intermediate film, and do not scatter, causing injury, and can continue to be used within a certain period of time (without affecting the line of sight), with good safety performance. Therefore, it is widely used in automobile windscreens, aircraft, windows and doors of high-rise buildings and special protective glass.
The application of color printing on ceramic pattern paper
PVB ceramic decal paper is used for ceramic printing by pressing a layer of PVC film on the wood paper, coating it with PVB film and printing patterns. PVB paper is easy to use, low cost and high color burning rate. Since 1985, the demand for PVB in ceramic paper industry has been increasing, with an annual growth rate of 20%. At present, the consumption of PVB in China's ceramic tissue paper accounts for 22% of the total output. The domestic ceramic industry has formed a formal standardized and large-scale production.
Application in coating industry
PVB is used in coatings, can prepare primer, baking paint, varnish, etc. the main domestic products are butyraldehyde phosphating primer, modified furan paint, etc. In most cases, when mixed with other resins, the hydroxyl group of PVB molecule provides an active group for chemical combination with other thermosetting resins.
PVB is used as etching and washing coating and sealant for wood products, which makes the wood gap not deformed, the coating has strong internal adhesion, moisture resistance, good elasticity, strong rigidity, impact resistance and no fading. PVB is used for fat coating to improve the waterproof, colorability and adhesion of fabrics. PVB is also used in heat sealing paint, can paint, temporary protective coating and powder coating for packaging.
Application in adhesive industry
PVB containing adhesives are mainly high performance structural adhesives, thermosetting and hot melt adhesives. PVB is an excellent hot melt adhesive matrix. When mixed with other components, PVB provides toughness, elasticity and high adhesion, especially for surfaces that are difficult to bond. After mixing with phenolic resin, it is used to bond metal products instead of the traditional method of linking metal products, which makes the joint of products more stressed and reduces the weight of products. Therefore, PVB adhesive is widely used in packaging, binding, labeling, metal foil and plastic film.
Application on tin foil paper
With the rapid development of national economy and export trade, the requirement of product packaging is higher and higher. In order to reduce the cost, vacuum aluminized paper with PVB coating is applied and developed rapidly.
