Due to its exceptional performance, PVA finds extremely wide-ranging applications:
Adhesives and Construction: As the primary raw material for "107 glue" (polyvinyl formal), it is utilized in building construction and interior decoration. It serves as a crucial component in water-based adhesives and remoistenable glues.
Textile Industry: Employed as a warp sizing agent to enhance yarn strength and abrasion resistance (PVA 17-99 grade is commonly used).
Paper Industry: Used as a surface sizing agent and coating agent to improve paper strength, gloss, and ink receptivity.
Films and Packaging: PVA exhibits excellent film-forming properties, and its films act as effective barriers against gases such as oxygen. It can be fabricated into water-soluble films for applications such as pesticide packaging, unit-dose detergent packaging, and medical embroidery backing. However, its poor water resistance limits its application in food packaging. Through modification or compounding with other materials, PVA packaging films possessing antimicrobial properties and sustained-release characteristics can be developed.
Polymerization Aids: Acting as a protective colloid and emulsion stabilizer, it is utilized in the emulsion polymerization of vinyl acetate (VAc) and the polymerization of other monomers (PVA 17-88 grade is commonly used).
Medical and Personal Care: Leveraging its biocompatibility and film-forming capabilities, PVA is used to manufacture contact lenses, wound dressings, artificial joint lubricants, and drug sustained-release carriers. Additionally, PVA finds application in cosmetic products such as facial masks and facial cleansers. Polyvinyl alcohol-based composite hydrogels have demonstrated significant potential in the healing of infected wounds.
Biomedical Materials: PVA is a non-toxic, biocompatible synthetic polymer capable of forming hydrogels through chemical or physical crosslinking. Physically crosslinked hydrogels-or blends with other biocompatible polymers-are particularly well-suited for biomedical applications. PVA is widely utilized in the design of biomedical materials, such as scaffolds for tissue engineering.
Environmental Remediation: PVA-based composite membranes can be employed in the remediation of refractory wastewater; for instance, by compounding it with activated carbon to create graded membranes capable of removing trace contaminants and heavy metals from wastewater.
Functional Materials: PVA can be utilized to fabricate materials possessing specialized properties-for instance, composite materials designed for radiation shielding applications. It can also be employed in the preparation of aerogels, which exhibit exceptional thermal insulation and flame-retardant characteristics.
3D Printing: Polyvinyl alcohol serves as a versatile excipient with extensive applications in the field of pharmaceutical 3D printing, enabling the rapid fabrication of various drug dosage forms, including personalized medicinal products.
Polymer Blends and Composites: PVA can be blended and compounded with a wide array of natural and synthetic polymers to enhance its performance attributes. For example, blending with chitosan yields materials suitable for use in food packaging and biomedical applications. Furthermore, blending with natural polymers-such as starch or cellulose derivatives-facilitates the development of eco-friendly, biodegradable films.
Other Applications: It is utilized as a temporary binder in ceramics manufacturing, a quenching fluid for metals, a slurry component for photovoltaic cell encapsulation films, and in various other applications.