ABSTRACT: Fluorosilicone modified acrylic resin is widely used as the main film-forming material for coatings because of its excellent weather resistance, self-cleaning and excellent film properties. In this paper, fluorosilicone modified acrylic resin and its synthesis technology and application in coatings are reviewed, and the development of fluorosilicone modified acrylic resin is prospected.
Fluorosilicone modified acrylic resin (fluorosilicone acrylic resin) has excellent weather resistance, high and low temperature resistance, waterproof and anti-ultraviolet properties, can be used in outdoor coatings products and high-functional coatings products requiring self-cleaning, high temperature resistance as the main film-forming materials. Therefore, silicon fluorine acrylic coatings will be widely applied in a specific field. In this paper, the synthetic methods of silicone fluorine modified acrylic resin coatings and their application in the field of coatings are reviewed.
1. Synthetic method
There are two general routes to synthesize fluorosilicone modified acrylic resin: one is to copolymerize fluorosilicone monomers, silicone monomers and other acrylic esters or other vinyl monomers; the other is to synthesize fluorosilicone prepolymer and then copolymerize with acrylic esters.
1.1 copolymerization of fluorinated acrylate and alkenyl silane monomer
AilanQu et al.  a core shell emulsion containing MAPTIPS as core and other monomer as shell was prepared by using methyl methacrylate, twelve fluoroheptyl methacrylate, methacryl oxypropyl three isopropyl silane and butyl acrylate as monomer. The core shell emulsion polymerization method was used, using organosiloxane (C-1757) and organic fluorine. A good hydrophobic fluorosilicone emulsion was prepared by synergistic effect. Kim et al.  prepared random copolymers by copolymerization of perfluoroalkyl acrylate with three silicon-containing monomers in the presence of methyl ethyl ketone in the presence of chain transfer agent. The relative molecular weight and surface free energy of the copolymers were compared. It was shown that the selection of the monomers was very important for the reaction.
1.2 synthesis of CO fluorosilicone prepolymer followed by copolymerization with acrylic monomers.
Furukawa et al.  fluorosilicone polymers with C8F17CH2CH = CH2 side chain C8F17 (CH2) 3 - were prepared by hydrosilylation of C8F17CH2CH = CH2 with polymethylhydrosiloxane. Xu Yunli et al.  adopted self-made fluorosilicone prepolymer, methyl methacrylate, butyl acrylate and acrylic acid. In the three component emulsifier system, the copolymerization was carried out by pre emulsification polymerization with potassium persulfate or ammonium persulfate as catalyst, and finally neutralized to pH=8 to produce fluorosilicone modified acrylic emulsion.
2. Application of fluorosilicone modified acrylic resin coatings
Fluorosilicone modified acrylic resin is the main film-forming material of coatings. Compared with ordinary coatings, fluorosilicone modified acrylic resin has better hydrophobic and oil-thinning properties, chemical resistance, high and low temperature resistance, ultraviolet resistance and antistatic and dust-absorbing properties. Therefore, its coating products are widely used.
2.1 application in Antifouling Coatings
Perfluoroacrylic acid vinegar monomer was synthesized from perfluorooctanoic acid. The monomer was polymerized with vinegar monomers such as acetic acid, butyl acrylic acid and methyl methacrylate under the action of azodiisobutyronitrile as initiator. A solution copolymer of acrylic acid vinegar containing perfluorooctane group was prepared and silane was added to the copolymer. Silicone modified perfluoroacrylate solution copolymer was prepared by coupling agent monomer KH-570. The results showed that the copolymer had excellent hardness, water resistance, alkali resistance, solvent resistance, surface self-cleaning and stain resistance, and could be used to prepare fluorosilicone antifouling coatings.
Fluorosilicone modified acrylic resin was synthesized by modification of traditional acrylic resin with organic fluorine monomer and silicone monomer, which had low surface energy properties. As a film-forming material, the nano-SiO2 and various additives were added to prepare nano-and micro-sized acrylic resin without surface structure. Toxic and hydrophobic marine antifouling coatings.
Acrylic acid six fluoro butyl ester and vinyl triethoxy silane were mixed in a certain proportion as modifier to modify styrene acrylic emulsion, which improved the film forming effect of the emulsion. The film contact angle increased by 83.7%, and its dirt resistance was obvious. It could be applied to antifouling paint.
2.2 applications in other areas
Fluorosilicon can also be used as a surface coating on metals, ceramics and plastics  for windproof baffles and windowpanes of aircraft, which can improve the visibility of pilots in rainy days. It has also been widely used in the field of special coatings, such as advanced vehicle decoration, rocket, aircraft surface finishing, naval ships anti-corrosion and anti-fouling, large bridge building anti-corrosion and other important areas. Fluorosilicone coatings have also been widely applied in the field of heavy anticorrosion in China. The elongation of fluorosilicone-acrylic coatings is better than any other resin coatings in the past. It is not easy to crack and peel off. It is an ideal engine coatings. In addition, fluorosilicone coatings can be used for outdoor sculpture, advertising, road signs drainage, oil repellent, and fouling.
Fluorosilicone materials have attracted more and more attention of researchers because of its excellent performance and wide application. Fluorosilicone materials can not only be used as acrylic resin modified materials, but also be used to modify other types of resins, and have obvious performance advantages and development prospects. However, the domestic research on fluorosilicon materials is still in the initial stage of exploration, compared with foreign research technology gap is still relatively large. Continuous research and development of new silicon fluoride materials will become a hot topic in this field.