The Research Of The Hydrophilic Coating Consisted Of Fluorinated Core-shell Emulsion Using Reactive Emulsifier

With the improvement of environmental rule of law increasingly in ourcountry and the enhancement of people's environmental awareness continuously,the environmental amicable paint is attracting many countries of the world, whichhas excellent performance and harmony with the environment. The water-basedpaint in our country was researched firstly in the 1960s and developed rapidly inthe 1990s,but it had low rate of market possession. The main reason is that thewater-based paint has many disadvantages such as bad water-resisted property,long film forming time, weak resistance to atmosphere and corrosion to metallicmaterial, so it is necessary to develop the water-based paint with high property.The organic fluorine paint contains C-F bond and has many particularlyexcellent performance. The fluorocarbon paint has developed for 41years since1965, which experienced four phase: heat fusing type, solvent dissolved type,normal temperature/room temperature solidifying (crosslinking) type,water-based/high solid content type. The fluorine paint firstly was used in thedeveloped area of Asia at the end of 1980s and entered into Chinese market in themiddle of 1990s. The research of the domestic fluorine paint started late.Furthermore,in the producing course of the organic fluorine paint, poisonousfluorine monomer with vinyl and monomer with vinyl and without functionalgroup are commonly used in synthesizing fluorine polymer emulsion throughemulsion polymerization, which are gas in normal temperature and take greatdifficulty totransportation and storage. What is more, the organic fluorine paintneeds to be roasted in the high temperature, with high film forming temperature.All above limit the application and popularization of the organic fluorine paint.According to these conditions, the advantage of water-based paint and fluorinepaint are combined to solve some difficult technical problem in the preparation offluorine-containing acrylic ester copolymer. Firstly, all kinds of polymertechnology are compared and the basic reaction mechanism of monomer starvingsemi-continuous seed polymerization is mainly discussed in this article. In order togain optimal recipe of fluorine-containing paint and optimal experimental condition,we have mainly determined the volumes of water, the proportion of monomers, thedosage of FMA, the variety of initiating agent and its dosage, the variety ofemulsifying agent and its dosage, the value of pH, the temperature and the velocityof stirring etc. Then, the synthetical property of fluorine-containing paintsynthesized is examined, such as appearance and gel particle or gel block, solidcontent, micrograph of emulsion, viscidity, the remainder of monomer, minimumfilm forming temperature,mechanical stability, freeze-thaw stability, bin stability,thermal stability, dilution stability, calcium ion's stability and so on.To comprehend the emulsion property further, we examine various propertiesof fluorine-containing emulsion film according to the standard of paint, such as thecolor and appearance of film, the clunging, the resistance to salt water, thechemical stability, the washing fastness, the hardness, the drying time, the characterof emulsion film structure through infrared spectrum and so forth. Finally, thiscore-shell fluorine-containing emulsion and the noncore-shell fluorine-containingemulsion are compared. The result proves that the core-shell fluorine-containingemulsion is better than noncore-shell emulsion in the following properties: thewater-resisted property, the oil-resisted property, the anti-corrosion property and soon.The fluorine-containing acrylic ester polymer emulsion is synthesized, whosemain raw materials are FMA, BA and MMA. Experiments show that thewater-based paint prepared with this emulsion not only has mostly excellentproperties of organic fluorine paint, but also has the properties of pure acrylicester emulsion and completely accords with the environmental requirement.Additionally, the synthetic technology of this emulsion is simple, applicable andless invested, so it is easy to apply to production.