Study On The Determination Of The Poisonous And Harmful Substances In Pressure Sensitive Adhesive And Its Products

Pressure-sensitive adhesive is an important branch of the adhesive field, it has characteristics of wide application, simple operations, high economic benefits, developing quickly, etc., it has become a very promising industry. The function and application of Pressure sensitive adhesive has received extensive attention, but the environmental problems are often ignored by people, for example, the environmental pollution and the harm to health. This study was on the determination of phthalate esters and antioxidant D in pressure-sensitive adhesive and its products which are harmful to the environmental safty and human health. The conclusions are as follows:A method for the simultaneous determination of nine Phthalate esters (PAEs) in pressure-sensitive adhesive and its products by high performance liquid chromatography-mass spectrometry (HPLC-MS) was developed.The sample was dissolved by ethyl acetate first,and then PAEs were separated from polymer after methanol was added into the solution which lead to the precipitation of polymer molecular while PAEs still remained in the supernatant. The extract was centrifugally separated for 5 min at a speed of 3000 r/min,and then the capacity of clear liquid was prepared for HPLC-MS analysis. The instrument conditions were as follows: The nine PAEs were separated on Xterra-Phenyl(150×3.9mm,5μm)column by gradient elution with acetonitrile-water as the mobile phase at a flow rate of 1 mL/min ,and quantitatively determined by selected ion monitoring (SIM). Under the optimized conditions for sample pretreament and chromatography-mass spectrometry,the method showed a good linearity in the range of 0.1-10mg/L for the nine PAEs. The limit of quantitation of the method were 0.0001% and 0.0005%. The established method was applied to determine three kinds of common pressure-sensitive adhesives which contain hotmelt pressure-sensitive adhesive , solvent pressure sensitive adhesive and emulsion pressure-sensitive adhesive. The recoveries ranged from 87.8% to 110.3% with the relative standard deviations (RSDs) less than 6.1% (n=6).The experiment results indicated that this method was reliable,sensitive and reproducibility,could meet the analysis request for the determination of PAEs in the pressure sensitive adhesive and its products.A method was developed for determination of Antioxidant D in Pressure-Sensitive Adhesive and its Products. The experimental method is that the sample was dissolved by ethyl acetate first,and then methanol was droped into the solution which lead to the precipitation of polymer molecular ,and last separated by high performance liquid chromatographic, determined by diode-array detector(DAD).The external standard method was adopted. The method showed a good linearity between peak area and the content in the range of both 0.01-1 mg/L and 1-100mg/L for the Antioxidant D. The limit of quantitation is 1mg/kg. The established method was applied to the emulsion type, hotmelt type, and solvent type pressure-sensitive adhesive,the recoveries ranged from 96.2% to 100.2%,and the relative standard deviations(RSDs) were between 1.1% and 3.1%.The experiment results indicated that this method was reliable,sensitive and reproducibility,could meet the analysis request for Antioxidant D in the pressure sensitive adhesive and its products.The methods which can provide both theoretical and technological support to the national detection work thus make great sense to the determination of the entry-exit commodities have practicability, speed and accuracy with high reproducibility and high sensitivity.