The Study On The Epoxidation Of Soybean Oil And Fatty Acid Methyl Esters And The Preparation Of Pressure Sensitive Adhesive

With the development of society and the chemical industry, green, environmental friendly industrial products attract more and more attentions. Pressure sensitive adhesive, as the representative of chemical products, has broad market prospects. At present,the materials of the the pressure sensitive adhesive are natural rubber and resins. The toluene and gasoline mixed solvents are generally added. Because these toxic reagents are harmful to the environment and human body, so they could not be the ideal resources. In this paper, soybean oil and soybean oil fatty acid methyl ester were chosen as the the raw materials, and the epoxidized soybean oil and epoxidized soybean oil fatty acid methyl ester were prepared by means of epoxidation, and then the pressure sensitive adhesive was synthesized via modification and polymerization.In this study, the influence of various fatty acid structure on the epoxidized soybean oil fatty acid methyl ester catalyzed by enzymes was discussed. The results showed that epoxidation induced by stearic acid and behenic acids were the best. Based on single factor experiments, the optimum conditions obtained through response surface methodology: reaction time 7.3h, reaction temperature 55℃, hydrogen peroxide/double bond molar ratio 2.81:l, enzyme loading 4% (enzyme/soybean oil fatty acid methyl ester, w/w). Under the optimal conditions, the epoxy value and conversion were 6.44% and 83.54% respectively. In 35℃-55℃, thermodynamics of the reaction was studied, and the activation energy was the 16.03KJ/mol. The soybean oil fatty acid methyl esters and epoxidized soybean oil fatty acid methyl esters were analyzed through Fourier spectrum, and the experiment showed the asymmetric stretching vibration absorption peak of the triple bond epoxy C-O-C was found in the 825cm-1, indicating the occurrence of epoxidation.The orthogonal experiment was employed to optimize the epoxy value of epoxidized soybean oil based on the single factor experiments. The optimal reaction conditions were as follows: soybean oil 30g, the reaction temperature 60℃, reaction time 6h, formic acid dosage 9mL, hydrogen peroxide dosage 35mL, the amount of sulfuric acid 0.1mL. Under this condition, the epoxy value and conversion of the epoxidized soybean oil were 6.62% and 86.20% respectively.The pressure sensitive adhesive was prepared by epoxidized soybean oil and epoxidized soybean oil fatty acid methyl ester, and the product was tested by peel strength. The performance of the pressure sensitive adhesive was well. The optimum conditions obtained through single factor experiments: epoxidized soybean oil and epoxidized soybean oil fatty acid methyl ester / reagents A / reagent B = 1:0.1:0.1 (w / v / v), the amount of curing reagent C 7%, curing temperature 150℃, expand capacity 30g/m2, storage time 8h under the condition of 80℃.An effective synthesis of pressure sensitive adhesive process route was developed in this paper. The feature is green, environmental protected and feasible. The pressure sensitive adhesive has better adhesion, and it has a good market prospect.