There are different kinds of glues, such as oil glue, water glue and hot melt pressure sensitive adhesive. So, how can we distinguish them? Let me introduce their characteristics to you.
Double-sided water glue is made by emulsification of acrylic or polyurethane resin through special emulsification equipment with water as solvent. It’s biggest advantages are: variety, environmental protection, low price. Many coatings now use water-soluble glues, such as: general water-soluble PA, water-soluble PU, and film-like glue, oil-feel and wax-feel, and other functional pulp. Water solubility will be the direction of the future coatings according to it’s functional, environmentally friendly, and inexpensive. The disadvantages are poor film formation, poor washing fastness, PU can not be attached to hot air glue, and it is not suitable to fit foam products such as sponge and foam.
The double-sided oil adhesive is prepared by dissolving acrylic acid or polyurethane in an oil solvent (toluene, DMF, methyl ethyl ketone, etc.) as a solvent. The advantage is that the film forming property is good, the fastness is good, and the PU can be attached with hot air glue, which is a coating glue commonly used at present. The disadvantage is that due to the use of oily solvents, there is a lack of environmental protection. In particular, the current price increase of oil has led to an increase in the price of oily solvents. Most of the coating glues are used because of the high cost, so they use relatively poor oily solvents, resulting in environmental protection failures. In addition, with the further improvement of environmental standards in various countries, Therefore, the environmental protection requirements for coated rubber are getting higher and higher.
The hot melt pressure sensitive adhesive is a kind of pressure sensitive adhesive, which is mainly prepared by mixing and heating a synthetic rubber, a resin and a rubber oil into a molten state and then coating it on a substrate such as a cotton paper, a cloth or a plastic film. The new adhesive tape is the biggest advantage of its low cost. The defect is that the viscosity is more affected by temperature. Mainly used in various types of sealing, paper packaging, beverage bottle labels, sealing aluminum foil, flexible packaging and other packaging; environmentally friendly paper pallets, etc., to adapt to various materials.
These are the differences of them. Now you already have a certain understanding of him.