The necessity of water-based acrylic pressure sensitive adhesive in high initial viscosity and high temperature resistance

Pressure-sensitive adhesive is a kind of viscoelastic material, in a very light pressure (1-10 pa), and a short contact time (1-5 s) can be enough glue and contact. Its characteristics are easy to paste when peeling off easily and quickly separating from the adhesive material, and not easy to remain, the bonding process is very sensitive to pressure, so it is widely used in work and life. There are many kinds of pressure-sensitive adhesive, the current use of pressure-sensitive adhesive is mainly rubber, solvent, and water. Rubber pressure-sensitive adhesive has natural rubber and synthetic rubber. The solvent of synthetic rubber pressure-sensitive adhesives is mainly toluene and other solvents, which cause a lot of harm to the human body and the environment in the process of use, especially benzene, toluene, xylene, and formaldehyde are the most harmful to human health.

Long-term exposure will cause anemia and leukemia. Solvent pressure sensitive adhesive contains a large number of organic solvents, and it is easy to produce volatile organic gases (VOCs) in the process of use, which can lead to diseases of the respiratory tract, kidney, lung, liver, nervous system, digestive system, and hematopoietic system. For example, solvents such as ethyl acetate have special odor and permeability, volatilization, and other characteristics, which can lead to many uncomfortable symptoms in the human body. The water-based pressure-sensitive adhesive uses water as a solvent to reduce the emission of volatile organic gases.

At present, as a kind of environmental protection glue, the water-based acrylic pressure-sensitive adhesive is gradually popular and widely used in the footwear industry and packaging industries. However, the low solid content of water-based acrylic pressure-sensitive adhesive on the market at the present stage leads to the low viscosity of emulsion, so it is necessary to use the transfer coating method to prepare adhesive tape, which increases the production cost. After high temperatures, easy to remain on the surface of the object, in the high humidity environment viscosity greatly reduced shortcomings, and can not meet the needs of people. By adding viscosifying resin, adjusting the type and proportion of functional monomers can improve the viscosity of the glue.