Industry Share: Preparation method of a water-based polyacrylate block copolymer pressure sensitive adhesive 3

Preparation Method of A Water-based Polyacrylate Block Copolymer Pressure Sensitive Adhesive 3

The water-based polyacrylate block copolymer pressure sensitive adhesive in this embodiment. the solid content of the pressure sensitive adhesive is 60% water-based polyacrylate-block copolymer, water-based polyacrylate block copolymer is multi-block structure, including hard monomer: isobornyl acrylate 30kg; Soft monomer: butyl acrylate 50kg, isooctyl acrylate 35kg; Functional monomer: hydroxypropyl methacrylate 2kg; Crosslinking monomer, N  hydroxymethyl acrylamide 2 kg and methylacrylic acid 1 kg.

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

S1, dissolve 1kg sodium dodecyl sulfate in 80kg deionized water to get the aqueous phase, dissolve 0.1kg hexadecyl alcohol and 0.15kg dithiocarboxylate (Z group is alkyl, the R group is isopropyl) in the soft monomer successively and then add them to the aqueous phase. After stirring evenly, adjust the pH of the mixture to 8.5. Then the mixture was cut at 3000rpm for 30min to obtain the soft monomer pre-emulsification solution.

S2, add the soft monomer pre-emulsion into the reaction kettle, add 0.08kg ammonium persulfate, stir evenly, and heat the reaction liquid to 75℃ for polymerization reaction;

S3, 2.5h after polymerization, hard monomers, functional monomers, and crosslinked monomers were added, stirred evenly and block copolymerization was initiated at 80℃.

For S4, after copolymerization for 2h, adding 0.02kg ammonium persulfate, and holding temperature for 2h at 75℃ and discharge, the water polyacrylate block copolymer pressure sensitive adhesive was obtained. 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.