Industry share: Preparation method of a water-based polyacrylate block copolymer pressure sensitive adhesive 4

Preparation method of a water-based polyacrylate block copolymer pressure sensitive adhesive 4

In this example, the water-based polyacrylate block copolymer pressure sensitive adhesive, the pressure sensitive adhesive solid content of 55% is water-based polyacrylate-block copolymer, water-based polyacrylate block copolymer multi-block structure, including hard monomer: voice methacrylate tablets 15kg, acrylamide 5kg; Soft monomer: butyl acrylate 50kg, isooctyl acrylate 25kg; Functional monomers: hydroxyethyl methyl acrylate 2kg; Crosslinking monomer, N  hydroxymethyl acrylamide 1 kg, acetoacetic acid ethyl methacrylate, 2 kg.

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

• S1, 1.2kg sodium dodecyl sulfate was dissolved in 81.82kg deionized water to obtain the aqueous phase, 0.12kg octadecyl alcohol, and 0.15kg 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 10. Then the mixture was dispersed ultrasonically for 30min to obtain the soft monomer pre-emulsion.
• S2, add the soft monomer pre-emulsion into the reactor, add 0.1 kg sodium persulfate, stir evenly, and heat 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 2 hours, adding 0.025kg sodium persulfate, and holding temperature at 80℃ for 2 hours, discharge, to obtain water 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 is 10μm, and the PET base film is placed in the oven at 125℃ and baked for 3min.