Waterborne adhesive is made by emulsifying acrylic acid or polyurethane resin with water as solvent through special emulsifying equipment. Its biggest advantages are variety, environmental protection and low price. Nowadays, many coatings are water-soluble adhesives, such as general water-soluble PA and water-soluble PU, as well as functional pastes, such as film adhesive, oil-sensitive wax-sensitive paste, scraping paste and so on. Water solubility will be the development direction of coatings in the future because of its functionality, environmental protection and low price. Disadvantages are poor film forming and washing fastness, and PU cannot be bonded with hot air.
Oily glue is made by dissolving acrylic acid or polyurethane with oily solvents (toluene, DMF, butanone, etc.). ). Its advantages are good film forming and fastness. PU can be pasted with hot air adhesive, which is a widely used coating adhesive at present. The disadvantage is the lack of environmental protection because of the use of oily solvents, especially the current rise in oil prices, leading to soaring prices of oily solvents. Due to the high cost of most coating adhesives and the use of poor oily solvents, environmental protection is ineffective. In addition, with the further improvement of environmental protection standards in various countries, the environmental protection requirements for coating adhesives are getting higher and higher.