Preparation of high hydroxyl self‐emulsifying polyester and compounding with acrylate

Abstract

Waterborne saturated polyester (WSP) with high hydroxyl content was prepared through solution polymerization by using stepwise feeding and stage heating methods. The stability of polyester dispersion was enhanced in terms of molecular structure and polymerization process. The conditions of polymerization process, monomer types, and catalyst type were determined. The effects of the ratio of alcohol-to-acid, trimethylolpropane (TMP) content and the feeding method, the content of terminal monomer and branched monomer on the dispersion were investigated. The stability of the self-emulsifying polyester and the water resistance of the film were proved to be excellent. Through transesterification, waterborne unsaturated polyester (WUP) was synthesized by WSP. Polyester-acrylate composite emulsion can be obtained by physical blending or chemical copolymerization of synthetic waterborne polyester. The viscosity of the composite emulsion was improved, and the hardness and water resistance were improved.

Emulsifier-Free Acrylate-Based Emulsion Prepared by Reverse Iodine Transfer Polymerization

“…At neutral pH, the acrylic acid would be in the ionic form (pK a = 4.25), and then the stabilization of the polymer latex is better [34]. In the previous work of our group, ammonia solution was added to the pre-emulsion, to ionize MAA, and in the polymerization period, to neutralize hydrogen ion derived by the decomposition of initiator APS [12,15]. Therefore, in order to ionize MAA to prepare emulsion by RITP Polymerization, ammonia solution was added into the MAA solution, to neutral pH.…”

“…But when the emulsions are used as metal coatings, the migration of the residual emulsifier migration to the surface of the polymer films may result in shrinkage, a decrease of the coating gloss, etc., and metal surface can confer water sensitivity to the films, leading to loss of the protective effect of coating [11]. Polymeric emulsifier, which can be chemically bonded to the polymer chain, is then introduced into the emulsion system [12][13][14][15]. For emulsion prepared by conventional radical polymerization [12], polymeric emulsifier SE-10 takes part in the stabilization of the polyacrylate emulsion.…”

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

“…As is shown in Figure 1, the hydrophobic polyester long chain and the hydrophilic ammonium carboxylate ionic component enable WP to stabilize the acrylate polymerization reactions like emulsifiers. Its critical micelle concentration (CMC) is 0.006 mol L −1 , in which case the surface tension of water is 46 dyn cm −1 24 . The excess OH of WP can also react with OCH 3 of MF resin to improve the water resistance and tensile property of the coating film.…”

“…The rotational speed was increased to 1000 r min −1 and deionized water was added dropwise. After being stirred for 20 min, the mixture was discharged at room temperature 24 …”

“…Thus, self‐emulsifying water‐borne saturated polyester (WP) prepared in our previous work was introduced to this study to stabilize the polymerization process. The molecular weight of the polyester was about 2000 g mol −1 and it had excellent water dispersion properties 24 . However, when we tried to use the polyester to modify the acrylic resin, coagulation occurred during the reaction when the amount of carboxylic acid monomer is less than 12%.…”