Study On Characteristics Of Packaging For Microwave Food

In this study,BOPA/LDPE composite film can be used directly on the microwave oven while cooking and heating food.The BOPA/LDPE composite film is provided by the Yanbian laser frequency plastics Technology Co.,Ltd.(JPNC).BOPA/LDPE composite film using a polyurethane adhesive in composite molding process is carried out dry compound,Polyurethane adhesive synthetic material,adding a certain amount of phthalate plasticizers,it can improve the elasticity of the adhesive layer itself,by ensuring that the forces,adhesive layer bonding may occur with the two films the same strain,achieve better adhesion of the two films in the composite process.Investigation of the microwave oven manufacturer's recommendations microwave heating power and heating time.Usually,most of the microwave heating in the microwave heating of food from 1 to 6 minutes,the maximum power of 800W.Determine the effects of microwave conditions within this range microwave energy to BOPA/LDPE film of their own characteristics.After microwave heating and by not BOPA/LDPE film sample after microwave heating process performed by Fourier transform infrared spectroscopy to determine the characteristic absorption peak of the group are all the same,no new groups produce that microwave energy to BOPA/LDPE the chemical structure of the film is not changed.For after microwave heating and microwave heating has not been treated BOPA/LDPE film DSC measurement showed that the microwave energy to BOPA/LDPE film aggregation structure has not changed.Detection of contaminants for phthalates using gas chromatography mass spectrometry,GC-MS analysis by phthalate plasticizers standard solution,so as to establish GC-MS detection of phthalates plasticized agent analysis method to determine the linear range of the method,linear correlation and the detection limit.Liquid-liquid extraction method were extracted LDPE,BOPA single film of harmful substances,solid-phase Extraction polyurethane adhesive harmful substances by GC-MS detection method has been established to detect and analyze layers of harmful substances,the results show that the polyurethane adhesives containing diisobutyl phthalate(DIBP)and dibutyl phthalate(2-ethylhexyl)phthalate(DEHP),so the DIBP and DEHP as the subject target analytes.By changing the microwave heating firepower(P10,P30,P50,P80,P100)within the household microwave range,time(1min,2min,3min,4min,5min,6min)to design the migration of DIBP and DEHP are under microwave heating experiment.Select four food subsitute representing different food matrices,on the main factors affecting BOPA/LDPE film phthalates specific move out research and compare the same factors under microwave heating BOPA/LDPE film positive,anti two contact surfaces of specific migration,namely LDPE surface contact with the food simulant liquid and BOPA surface contact with the food substitute,respectively,which artificially defined as positive and negative direction.Microwave cooking process differs from traditional heating methods,it has transient temperature characteristics,through migration unit for measuring the temperature of the microwave heating microwave energy can be seen in distilled water,3%acetic acid and 15%ethanol rapid warming in 1min,after which the temperature is not significant changes,iso-octane action is less microwave energy,the temperature rises slowly.Which you can determine the temperature effect on BOPP/LDPE film DBP and DEHP migration was not significant,DIBP and DEHP by microwave energy in food simulants influence significantly.Thus the microwave energy to DIBP and DEHP standard solution and stability in four food simulants in research and analysis,the results indicate that microwave energy can reduce the activation energy of the decomposition reaction of compound molecules,weakening the strength of chemical bonds between molecules,while increasing the intermolecular the effective collision,DIBP and DEHP molecules absorb microwave energy,and promote the transition from the ground state molecules into the excited state,resulting in increased molecular bond breaking and regeneration,which can effectively promote its weak acid solution partially hydrolyzed,resulting detected reduction of specific migration.Because DIBP and DEHP present in the composite film in the middle of a polyurethane adhesive,which by microwave energy to food simulants affect migration there will be positive and negative directions.Therefore,the film both positive and negative to the specific migration were measured results show positive transfer is greater than the reverse migration,mainly due to its own pros and cons of the different characteristics of the film,on the other hand it is due to migration,polymeric affinity material and liquid food simulants different result.