Study On The Synthesis And Antifogging Property Of Different Polyglycerol Fatty Acid Esters

Polyglycerol fatty acid esters are a series of good performance and non-poisonous non-ionic surfactants. Recently they have been reported in plastics industry as antifogging agents. Polyglycerol fatty acid esters can be synthesized by different degrees of polymerization of polyglycerols and different fatty acids, which will definitely have an impact on their corresponding anti-fog performances. To broad their application in this field and provide a scientific basis for future research, this article focuses on the synthesis of a series of different polyglycerol esters of fatty acid and their effects on antifogging properties and antifogging duration times of their corresponding coatings on PE films.First of all, a series of polyglycerols with different degrees of polymerization were synthesized by the same amount basic catalyst at high temperature. Different polyglycerol esters of fatty acid with the same acid value were prepared by the reaction of different polyglycerols and lauric acid, myristic acid, palmitic acid, stearic acid respectively at atmospheric pressure and high temperature. The antifogging plastic films were prepared by spraying the PGFE on the surface of PE films and dried at room temperature. To compare totally, glycerol esters were synthesized and tested too, including glycerol laurate, glycerol myristate, glycerol stearate and plaminate.As a result, we found the following conclusions. The degree of polymerization of polyglycerol has a certain impact on the antifogging performance of their corresponding esters. When the degree of polymerization is less than 2.5, with the increase of the degree of polymerization, the corresponding ester shows better antifogging performance, when the degree of polymerization is greater than 2.5, along with the increase in degree of polymerization the corresponding ester shows worse antifogging performance. The degree of polymerization of polyglycerol has a certain impact on the antifogging duration time of the corresponding ester. When the degree of polymerization is less than 2.5, with the increase of the degree of polymerization, the corresponding ester shows shorter a antifogging duration time, when the degree of polymerization is greater than 2.5, along with the increase in degree of polymerization the corresponding ester shows a longer antifogging duration time. The carbon number of fatty acid influence both the antifogging performance and the antifogging duration time. The ester with a longer carbon chain shows a longer duration time but worse antifogging property. The esters with a shorter carbon chain are just on opposite. 2.5-polyglycerol fatty acid esters show better antifogging property than glycerol esters but shorter duration times.