Chemical production line

Polyvinyl acetate (PVAc), commonly known as wood glue, PVA glue, white glue, carpenter's glue, school glue, or Elmer's Glue in the US, is a widely available adhesive used for porous materials like wood, paper, and cloth. The primary raw material for PVAc production is vinyl acetate monomer. Equipment Configuration: ▪ PVAc dissolving tank ▪ Reactor ▪ Initiator tank ▪ Condenser ▪ Inverter ▪ Control cabinet ▪ PVAc solution pump ▪ Finished product Discharge pump ▪ Initiator Metering pump ▪ Filter (PVAc/finished product) ▪ Water pump ▪ Water tower Characteristics of PVAc: ▪ Good adhesion ▪ Water soluble ▪ Weather resistance ▪ Adjustability ▪ Low toxicity ▪ Lower cost Raw materials preparation The main raw material used in PVAc production is a copolymer of vinyl acetate and other monomers such as ethylene or acrylic acid. Other additives such as plasticizers, thickeners, and preservatives may also be added to improve the quality of the final product. Emulsion polymerization The copolymer resin is dissolved in water along with other additives and a surfactant to form a stable emulsion. The emulsion is then heated under controlled conditions while continuously stirring. This process triggers a chemical reaction known as polymerization. Neutralization and adjustment of pH Once the polymerization is complete, the pH of the PVAc emulsion is adjusted to the desired level by adding an alkaline solution. This is necessary to neutralize any residual acidity in the emulsion and stabilize the glue. The pH value is one of the indicators for quality testing of PVAc.