Polyvinyl alcohol (PVA) glue, also known as white glue, wood glue, or school glue, is a popular adhesive used for various applications. It is a synthetic polymer-based adhesive that is water-soluble and non-toxic. Here are some key characteristics and common uses of PVA glue:
1. Water-Soluble: PVA glue is water-based, which means it can be easily diluted with water and cleaned up with water while it's still wet. This makes it convenient for both application and cleanup.
2. Non-Toxic: PVA glue is generally considered safe and non-toxic, making it suitable for use in schools, homes, and craft projects.
3. Drying Time: It typically has a relatively short drying time, especially for thin layers. However, drying time may vary depending on factors like temperature, humidity, and the thickness of the glue layer.
4. Bonding Strength: PVA glue creates a strong bond between porous materials such as paper, cardboard, wood, fabric, and porous ceramics. It is not suitable for bonding non-porous materials like glass, metal, or plastic.
5. Versatility: PVA glue is commonly used for a wide range of applications, including paper crafts, woodworking, bookbinding, and as an adhesive for porous materials in general.
6. Clear and White Varieties: PVA glue is available in both clear and white formulations. Clear PVA glue dries transparent, making it suitable for applications where the glue needs to be invisible once it dries, while white PVA glue dries with a white finish.
7. Woodworking: In woodworking, PVA glue is often used for bonding wood joints. It provides a strong bond and is suitable for a variety of wood types.
8. Crafts and DIY Projects: PVA glue is a staple in crafting and DIY projects, such as making collages, papercrafts, and creating decorative items.
9. School and Office: It is a common adhesive in schools and offices for general paper-related tasks, such as gluing paper, cardboard, and other stationery items.
10. Sealing and Protecting: PVA glue can also be used as a sealant and protective coating for various surfaces. When diluted with water, it can be applied as a thin, clear layer to protect artworks or crafts.
Polyvinyl Alcohol PVA Glue Formula
Formula 1
Ingredients: Polyvinyl alcohol 0-8%, polyvinyl acetate or ethylene-vinyl acetate or their mixed latex (N'XN 50Z) 1.0%-40%, appropriate amounts of modifier and thickener, 55%-88% water; cement or gypsum and its retarder or activator, totaling 3%-25% (this solid inorganic adhesive can be added separately and temporarily at the time of use). Preparation Method: Add 30g of polyvinyl alcohol to a heating pot containing 400g of water, stirring, and heat to 90-100°C.
Stir for about half an hour to completely dissolve the polyvinyl alcohol. Then cool to below 80°C. Add 300g of polyvinyl acetate (50% content) and 20g of thickener. Add the remainder of the mixture with water to a total of 900g. This is Component A. When using, add Component B:
100g of white cement containing a mixture of tricalcium silicate and dicalcium silicate, or 100g of hemihydrate gypsum and its retarder. Stir thoroughly.
Add sizing and proceed with pollution-free cold-pressing of artificial boards.
Recipe 2
Ingredients: 5%-11% polyvinyl alcohol, appropriate amount of modifier, 65%-88% water; 5%-25% cement or gypsum and its retarder or activator (this inorganic component can be added separately and temporarily at the time of use).
Preparation: Add 75g of polyvinyl alcohol to a heating pot containing 750g of water, stir, and heat to 90-100°C.
Stir for half an hour until completely dissolved. Then add an appropriate amount of modifier and the remainder with water to a total of 880g. This is the A component. When using, add component P: 120g of white cement and activator, or 100g of hemihydrate gypsum and retarder. Stir thoroughly, then apply the glue and begin the pollution-free cold-pressing production of artificial boards.
Recipe 3
Ingredients: 1%-7% polyvinyl alcohol, 5%-30% hydrolyzed starch, 60%-88% water; 3%-20% cement or gypsum and its retarder (this inorganic component can be prepared separately and added temporarily at the time of use).
Preparation: Add 50g of polyvinyl alcohol to a heating pot containing 500g of water and heat to 90-100°C.
Stir under reduced pressure until completely dissolved. Then, add 500g of starch glue containing 300g of hydrolyzed starch, bringing the total to 1000g.
This constitutes Component A. When using, add Component B: an appropriate amount of curing agent, 100g of hemihydrate gypsum, and a retarder. Stir thoroughly.
This is then ready for gluing and pollution-free cold-pressing of artificial boards.
While PVA adhesive is versatile and easy to work with, it might not be suitable for all applications. For projects that require higher strength, greater durability, resistance to moisture, or heat resistance, other types of adhesives such as epoxy, cyanoacrylate (super glue), or polyurethane adhesive might be more appropriate.
