Preparation and characterization of self‐emulsifying poly(ethylene glycol) methyl ether methacrylate grafted polyacrylate copolymers modified by waterborne polyester

Abstract

The high molecular weight polyacrylate self‐emulsifying emulsion with 20% hydroxyl monomer and 50% solid content was prepared. Waterborne polyester was used to modify the acrylate resin. Besides acrylic acid (AA) and methacrylic acid (MAA), poly(ethylene glycol) methyl ether methacrylate (PEGMEMA) was also used as functional monomer to stabilize the polymerization process and improve the properties of the emulsion. The effects of the amount of waterborne polyester (WP), ammonium persulfate (APS), poly(ethylene glycol) methyl ether methacrylate (PEGMEMA), methacrylic acid (MAA)/acrylic acid (AA) monomer ratio, butyl acrylate (BA)/styrene (St) monomer ratio on the molecular weight, particle size, viscosity, storage stability, and cured film properties of the polyacrylate emulsion were investigated. The average molecular weight of the modified polyacrylate was up to about 2.5 × 104 g mol−1. The emulsion remained stable after 6 months at room temperature. Transmission electron microscope (TEM) images showed that the latex particles had core‐shell structure. The films cured with melamine formaldehyde (MF) resin showed excellent water resistance, adhesion, and hardness.

Preparation and properties of soap‐free emulsion of polyacrylate grafted by polyester with highHEMAcontent

“…In previous studies, when the soft/hard monomer ratio of WP/WA emulsion was 1/5 and T g was 31.6 C, the performance of crosslinked films reached the best that the pencil hardness was 3 H, and the tensile strength was 4.96 MPa. 28 In fact, when the unsaturated polyester copolymerized with the polyacrylate, it acted as a soft monomer and reduced the holistic T g . The best soft/hard monomer ratio of WUP-WA emulsion was 1/4 and the T g was 20.6 C, the proportion of hard monomer was reduced, but the hardness of the film was 5 H, and the tensile strength was 7.68 MPa.…”

“…After crosslinking with hexamethylol methymelamine, the films showed a smooth surface and the pencil hardness of the film was 3H. 28 Unsaturated polyesters form polyester-acrylate copolymers by copolymerization used to improve the hydrolysis resistance of polyester chain segments. 29 Shivarkar et al synthesized base unsaturated polyester with itaconic acid and such unsaturated polyester was copolymerized with acrylic monomers in various concentrations, resulting in a series of polyester-modified polyacrylate, and the films showed good mechanical properties like hardness, adhesion, flexibility, and impact resistance.…”

A New Approach Utilizing Aza-Michael Addition for Hydrolysis-Resistance Non-Ionic Waterborne Polyester

“…Although the ionic polyesters are facile in synthesis and dispersing procedures, there are still defects to be resolved. The anionic polyester is usually difficult to apply in acidic environments and has poor compatibility with certain additives and inert pigments, [10] and the sulfonate-based polyesters are corrosive to metal substrates [11]. Waterborne polyester prepolymer with a molecular weight of around 6000 g mol −1 usually exhibits better comprehensive properties and is suitable for the classical hardening formulations, [12] but it was difficult for ionic WPE to achieve such a molecular weight.…”