Chemically and Physically Modified Flame-Retardant Silicone-Acrylic Emulsion Adhesive for Electrostatic Flocking
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Chemically and Physically Modified Flame-Retardant Silicone-Acrylic Emulsion Adhesive for Electrostatic Flocking Man Zhou1 · Shixiong Zhai1 · Tiantian Song1 · Hong Zhao1 · Zhuizhui Fan1 · Fengyan Ge1 · Yaping Zhao1 · Bi Xu1 · Zaisheng Cai1 Received: 2 March 2020 / Accepted: 2 July 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract The acrylic adhesives with the flame-retardant property are necessary to meet the safety requirement in electrostatic flocking. In this study, acrylic emulsion chemically modified with phosphorus and silicone, PSE, with core–shell structure, was synthesized by introducing the vinyl silicone oil and phosphor-containing monomer (PAM-100) onto the molecular chain of acrylic ester polymer in the core and shell layer, respectively. Subsequently, the silicone-acrylic adhesive with flame retardation (FR-SA) was prepared by mixing PSE with inorganic flame-retardant, Al(OH)3. The acrylic adhesive obtains the excellent flame retardation under a low addition of Al(OH)3 when the ratio of PAM-100 is 5%, while the commercial adhesive needs a high addition of the inorganic flame retardant to realize the satisfactory performance. FR-SA in this work has a great potential application as intrinsically flame-retardant electrostatic flocking adhesive. Keywords Silicone-acrylic emulsion · Flame retardant · Phosphate · Thermal properties
1 Introduction Electrostatic flocking is the process of implanting villi on a substrate surface in a high voltage electrostatic field [1–3]. The suitable adhesive plays an important role in attaching the villi to the substrate [4, 5]. Acrylic emulsions are widely used in electrostatic flocking due to their good adhesion and low toxicity [6–8]. However, the water resistance and low temperature resistance of the acrylic polymer are usually not satisfactory. To overcome these drawbacks, several chemical modifications have been used with fluorinated organic compounds, silicone polymers, as well as self-crosslinking [9]. An effective strategy for improving acrylic emulsions is copolymerizing of organosilicone monomer with acrylate monomer. Organicsilicone fragments tend to migrate to the interface and minimize the surface free energy. Therefore, a silicone modified acrylic polymer emulsion (silicone-acrylic emulsion) has the advantages of good film-forming property, * Zaisheng Cai [email protected] 1
Key Laboratory of Science and Technology of Eco‑Textiles, Ministry of Education, College of Chemistry, Chemical Engineering and Biotechnology, Donghua University, Shanghai, China
wettability, high and low temperature resistance, chemical resistance, water resistance, weather resistance, ultraviolet resistance and anti-pollution etc. [10]. However, the easy combustibility is one of the main problems limiting the application of acrylic emulsionsbased adhesives. With the increasing concern on safe issues, the acrylic adhesives with flame-retardant property have gained more and more attention [11, 12]. Flame retardant addition and molecular modificat
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