Industry Share: Preparation method of a water-based polyacrylate block copolymer pressure sensitive adhesive 1

Preparation method of a water-based polyacrylate block copolymer pressure sensitive adhesive 1

The water-based polyacrylate block copolymer pressure sensitive adhesive in this embodiment. the solid content of the pressure sensitive adhesive is 40% water-based polyacrylate-block copolymer, the water-based polyacrylate block copolymer is a multi-block structure, including hard monomers: vinyl acetate 7kg, methyl methacrylate 8kg; Soft monomer: Butyl acrylate 80kg; Functional monomer: hydroxypropyl acrylate 2kg; Crosslinked monomer: Acrylic acid 3kg.

The preparation method of the above water-based polyacrylate block copolymer pressure sensitive adhesive includes the following steps:

S1, 1.5 kg sodium dodecyl sulfate was dissolved in 150kg deionized water to obtain the aqueous phase, 0.15 kg hexadecyl alcohol and 0.1 kg trithiocarbonate (Z group is alkyl, the R group is isopropyl) were dissolved in the soft monomer successively and then added to the aqueous phase. After mixing evenly, the pH of the mixture was adjusted to 9. Then the mixture was cut at 1000rpm for 30min to obtain the soft monomer pre-emulsion.

S2, add the soft monomer pre-emulsion into the reactor, add 0.04kg azodicyanopentonic acid, stir evenly, and heat up the reaction solution to 75℃ for polymerization;

S3, after polymerization for 2 hours, hard monomers, functional monomers, and crosslinked monomers were added, stirred evenly and block copolymerization was initiated at 75℃. For S4, after copolymerization for 2h, 0.01kg azodicyanopentonic acid was added and kept at 80℃ for 2h before discharge to obtain water-based polyacrylate block copolymer pressure sensitive adhesive. When using, the pressure sensitive adhesive emulsion is directly coated on the PET base film of 50μm, the thickness of the dry adhesive is 10μm, and the PET base film is placed in the oven at 125℃ for 3min.