The emulsifier determines whether the acrylic pressure sensitive adhesive can form a stable and uniform adhesive system

The emulsifier determines whether the acrylic pressure sensitive adhesive can form a stable and uniform adhesive system

Pressure sensitive adhesive is a kind of pressure sensitive adhesive, that does not need to add other additives or heating, only needs to apply a small pressure can be firmly bonded with the substrate, after the unveiling will not have a shadow on the surface of the substrate, its characteristics are easy to stick, uncovered is not difficult, stripping without damage, in a long time the adhesive layer will not dry up, Therefore, pressure sensitive adhesive is also called self-adhesive. Pressure-sensitive adhesive products are used in packaging, automobile, transportation, communication, electrical appliances, building materials, machinery, aviation, light industry, health, and other fields. Because of its convenient use, easy operation, and wide range of applications, pressure-sensitive adhesive has developed rapidly.

Emulsifier is to determine whether the acrylate adhesive can form a stable and uniform adhesive system, which determines the quality of the acrylic emulsion polymerization process, an emulsifier can disperse monomer into a storage monomer as the center of the fine monomer droplets, and the formation of the emulsion can also form micelles and sol-increasing beam, according to the micellar mechanism as the formation of the reaction center of the latex particle. It can be adsorbed on the surface of monomer droplets and latex particles to form a stable polymer emulsion, which will not break milk in the process of polymerization, storage, transportation, and application. At the same time, the emulsifier also directly affects the polymerization rate of the emulsion.

Therefore, whether emulsion polymerization can be successfully carried out and whether polymer emulsion and emulsion polymer with excellent properties can be made, the correct selection and rational use of emulsifier can not be ignored. Another important parameter of the emulsifier is the hydrophilic and oil-philic balance value, that is, the HLB value, which is used to measure the hydrophilicity and oil publicity of the emulsifier. The larger the HLB value is, the greater the hydrophilicity of the emulsifier will be. Each emulsifier has a specific HLB value, generally in the range of 1 to 40. HLB value is an important basis for selecting an emulsifier.

Initiator is an important component of the acrylate emulsion polymerization formula, the type and amount of initiator are directly related to the polymerization reaction rate, the stability of polymer emulsion, and the quality of the product, so the correct selection of initiator is also a very important issue for emulsion polymerization formula design.