What is Polyvinyl Butyral (PVB)?

Polyvinyl butyral (PVB) is a synthetic resin in the form of a white powder formed by condensing polyvinyl alcohol and butyral with an acid.PVB resin has a series of superior physical and chemical properties, including high transparency, elasticity, toughness, strong alkali resistance, oil resistance, flexibility, and low-temperature impact resistance. In addition, PVB resin also has good adhesion, showing good adhesion to metals, ceramics, plastics, leather, wood, and other materials, and has good adhesion with other resins (such as epoxy resin, phenolic resin, etc.) compatibility.The major application is laminated safety glass for automobile windshields.

 

 

What is Polyvinyl Butyral (PVB) used for?

Interlayer for safety glass: This is the most important application of PVB. PVB is often used as the raw material for interlayer in safety glass because of its good optical clarity and weather resistance, its ability to maintain no deformation over a wide temperature range, and its high bonding efficiency with glass and other materials. In safety glass, PVB film can bond two layers of glass together, thus improving the strength and safety of the glass.
Specialty coatings and adhesives: PVB contains hydroxyl, vinyl acetate, and butyraldehyde groups and, therefore, has high bonding properties. It can be used as the main raw material for the manufacture of adhesives, such as copper foil adhesive and self-adhesive enameled wire lacquer, with excellent resistance to peel strength and soldering temperature. In addition, PVB can also be used to manufacture ceramic printing paper, aluminum foil paper, and glass fiber-reinforced plastic.
Electronic materials: In electronics, PVB can be made into an adhesive for bonding and assembly of electronic instrumentation components, metal and porous material bonding, and emergency repair. In the development of ceramic integrated electronic circuits, medium viscosity, low hydroxyl PVB can be used as ceramic powder adhesive to increase the native strength of ceramics.
Medical and health field: PVB is a biocompatible polymer material that can be used to manufacture artificial blood vessels, bones, joints, and other medical devices. It can also be used to manufacture drug slow-release agents.
Packaging and textile industry: PVB can be used to manufacture high-transparency packaging film, cling film, and food packaging bags. In the textile industry, it can be used to manufacture high-strength, highly elastic fiber materials, such as polyvinyl alcohol fibers and polyvinyl alcohol yarn.
In addition, PVB has a wide range of applications in the construction industry, such as the manufacture of bulletproof glass, solar panels, sound and heat insulation materials, and high-performance architectural coatings and waterproof materials.

 

How is Polyvinyl Butyral (PVB) packaged and stored?

Packaging: Use packaging materials with good moisture and dust resistance, such as polyethylene or polypropylene film bags, and ensure that the packaging materials do not chemically react or physically adhere to the PVB.
Storage: Avoid storing in humid or high-humidity environments to prevent the material from absorbing moisture. Avoid direct sunlight to prevent UV damage to PVB.
Control temperature and humidity to prevent the material from absorbing moisture
Avoid puncturing or crushing of PVB materials by sharp objects during packaging and transport.
Use appropriate cushioning materials to minimize the effects of vibration and shock on the material.

 

4.What are the precautions for the use of Polyvinyl Butyral (PVB)?

The use temperature of PVB needs to be controlled within the temperature range of 60℃-80℃ and ensure that the temperature is evenly distributed, too high or too low a temperature may affect its bonding effect.
PVB material may release harmful gases during use, so air exchange devices should be installed in the operation place to ensure good ventilation. In addition, direct skin contact with PVB should be avoided and protective equipment such as protective glasses and gloves should be worn. PVB material is flammable, so it should be stored away from sources of ignition and transported according to the regulations for the storage and transport of flammable goods.
During use, if discomfort or suspected symptoms of poisoning occur, stop operation immediately and seek medical assistance.

 

5.What are the classifications and differences of PVB?

PVB film grade: Characteristics: It has high viscosity properties and is mainly used as a safety glass application for PVB. When the outside world strongly impacts the laminated glass, the PVB film can absorb the impact energy and stick to the glass fragments, keeping the glass surface clean and smooth. This can effectively prevent fragments from getting stuck, penetrating, and falling, ensuring personal safety.
Application: This material is mainly used to make laminated materials for safety glass, such as laminated glue between double-layer glass. It has good transparency and high impact strength and is widely used in aviation, automotive, and construction fields. High-end products are used in the military industry as bulletproof glass for aircraft, tanks, and ships, while low-end products are used for building safety glass.

PVB non-film grade:
Characteristics: Compared with film-grade PVB, its viscosity may be lower and its application fields are wider.
Application: In the coating industry, it is used to make metal base coatings and cold-proof paints with strong anti-corrosion and anti-rust capabilities, good adhesion, and water resistance; in the ceramic industry, it is used to make thin-film decals with bright patterns; in the resin industry, used to make pressed plastics that replace non-ferrous metals such as steel and lead, as well as a variety of adhesives; in the textile industry, used to make fabric treatment agents and yarn tubes; in the food industry, used to make non-toxic packaging materials; In the papermaking industry, it is used to make paper treatment agents; in addition, it can also be used to make anti-shrink agents, stiffening agents and other waterproof materials.