Abstract
The soap-free emulsion of vinyl acetate (VAc)/butyl acrylate (BA) copolymer was prepared by a semi-continuous and pre-emulsification polymerization method, using ammonium sulfate allyloxy nonylphenoxy poly(ethyleneoxy) (10) ether (DNS-86) as a reactive emulsifier. The effects of DNS-86 on the stability of the emulsion and the properties of the latex film were investigated. The infrared spectrum, thermal stability, glass transition temperature and micromorphology of latex were also studied. The results showed that the emulsion had the best stability and the conversion rate reached a maximum of 98.46% when the DNS-86 amount was 4 wt % of the total amount of monomers. Compared with the PVAc latex synthesized with octylphenol polyoxyethylene ether (10) (OP-10), the latex prepared with DNS-86 has higher thermal stability and ionic stability, whereas the latex film has better water resistance.
Highlights
Polyvinyl acetate emulsion (PVAc) is a high molecular polymer synthesized by free radical polymerization, which is widely used in industries such as light industry, textile and wood processing [1,2,3]
The polyvinyl acetate homopolymer has poor water resistance and weather resistance, and the stability of the emulsion is poor without a protective colloid, so it is often modified with certain methods to improve emulsion performance [4,5,6]
Monomer conversion is 98.64%, the coagulation ratio is 0.34% and the latex has better ionic stability. with the PVAc latex prepared with OP-10, the latex film prepared with DNS-86 has a Compared the PVAc prepared withthe
Summary
Polyvinyl acetate emulsion (PVAc) is a high molecular polymer synthesized by free radical polymerization, which is widely used in industries such as light industry, textile and wood processing [1,2,3]. The polyvinyl acetate homopolymer has poor water resistance and weather resistance, and the stability of the emulsion is poor without a protective colloid, so it is often modified with certain methods to improve emulsion performance [4,5,6]. When BA copolymerizes with the VAc monomer, it can protect the ester group of the VAc chain and reduce the hydrolysis rate of the ester group. Thereby, the shortcomings such as water resistance and stability of the polyvinyl acetate emulsion are improved [7,8,9].
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