A Complete Guide to Polyacrylate Emulsion Adhesives

Modification of Polyacrylate Emulsion Adhesives

Modification with Tackifying Resins

Viscosity-increasing resins primarily serve four functions:
1. Reduce the surface tension of the adhesive and improve its wetting ability on the substrates
2. Increase the adhesive’s flowability and tackiness; generate adhesive force through surface diffusion and internal penetration, thereby enhancing bonding performance
3. Extend the adhesive’s tack retention period and increase the open time
4. Reducing the adhesive’s viscosity, increasing its penetrability, and improving processability
Tackifying resins can be divided into two major categories: natural resins and synthetic resins. The former includes rosin and ethylene resins, while the latter consists primarily of petroleum resins.

KT101 Rosin

Special Grade Rosin

Refined Light-colored Rosin

Colorless Hydrogenated rosin resin

C5 Petroleum Resin

C9 Cold Polymerized Petroleum Resin

C5 Hydrogenated Petroleum Resin

C9 Hydrogenated Petroleum Resin

Silicone Modification

Silicone-modified acrylic emulsion adhesives exhibit significant improvements in bonding strength, hardness, tensile strength, solvent resistance, scrub resistance, and water resistance. There are two methods for their preparation: blending and copolymerization. The blending modification process is simple but prone to phase separation, resulting in only limited improvements in performance; copolymerization, on the other hand, involves chemical incorporation into the network. As the amount of silicone monomer increases, the water resistance, solvent resistance, chemical resistance, heat resistance, and cold resistance of copolymer emulsion adhesives are significantly improved, and their bonding performance is also enhanced to a certain extent.

Epoxy Modification

When preparing epoxy-modified acrylate emulsion adhesives, the epoxy resin is typically first dissolved in acrylate monomers. After high-speed stirring and emulsification, emulsion polymerization is carried out to uniformly disperse the epoxy resin in the polyacrylate. A curing agent is then added to the system to cross-link the epoxy groups, forming an interpenetrating network structure with an epoxy resin cross-linked network as the backbone and with polyacrylate chains running through it. The modified emulsion prepared in this way combines the high strength and good adhesion of epoxy resin with the excellent weather resistance and flexibility of polyacrylate.

Polyurethane Modification

Polyurethane offers advantages such as good mechanical properties, water resistance, excellent low-temperature resistance, and minimal variation in hardness with temperature. Modifying polyacrylate (PA) emulsion adhesives with polyurethane (PU) allows for the preparation of emulsion adhesives with good overall performance. The main modification methods include physical blending of polyurethane emulsion with polyacrylate emulsion; synthesizing acrylate composite emulsions using polyurethane emulsion as a seed; first preparing a solvent-based PA/PU copolymer, then stripping off the solvent, neutralizing, and emulsifying to obtain a composite emulsion; and first synthesizing unsaturated carbamate monomers containing carbon-carbon double bonds, followed by emulsion copolymerization with acrylate monomers.

Organofluorine Modification

Due to the high electronegativity and small atomic radius of the fluorine atom, as well as the high bond energy and short bond length of the C–F bond, fluorinated polymers exhibit excellent weather resistance, water resistance, oil resistance, and resistance to chemical corrosion.

Types of Polyacrylate Emulsion Adhesives

Polyacrylate Adhesives for Pressure-Sensitive Adhesives

Polyacrylate Adhesives for Paper-Plastic Laminates

Polyacrylate Adhesives for Fabric Printing

Polyacrylate Adhesives for Flexible Printed Circuits

Polyacrylate Adhesives for the Construction Industry

Colorless Hydrogenated rosin resin

H120K Modified Rosin Resin