Method for detecting MAH residual monomer migration volume in PP-g-MAH material

Abstract

The invention provides a method for detecting the MAH residual monomer migration volume in a PP-g-MAH material, and the method comprises the following steps: Step 1, establishing a standard working curve, and carrying out ultraviolet spectrum test on a standard working solution; taking the concentration of the standard working solution as a horizontal ordinate; drawing a standard working curve bytaking the corresponding ultraviolet absorbance at a proper reference wavelength as a vertical coordinate; and Step 2, detecting the MAH residual monomer migration volume in a PP-g-MAH sample material, placing a sample sheet in an oil-based food simulant for extraction, and preparing a migration extracting solution; taking the migration extracting solution and deionized water to react in a high-pressure reaction kettle; taking out the mixed liquid of the high-pressure reaction kettle, separating the liquid, and taking a water phase; and performing ultraviolet spectrum test on the taken water phase, reading the absorbance value, and calculating the MAH residual monomer migration volume in the sample according to the standard working curve established in the Step 1.

Description

technical field [0001] The invention belongs to the detection field of residual monomer migration in maleic anhydride modified resin materials, in particular to a novel detection of residual maleic anhydride (PP-g-MAH) in maleic anhydride grafted modified polypropylene resin materials (PP-g-MAH) MAH) free monomer migration method. Background technique [0002] Multilayer barrier packaging is a multilayer structure film material composed of polar materials such as polyamide, ethylene-vinyl alcohol copolymer or aluminum foil with strong gas barrier properties and polyolefin with good heat sealability. Because it can effectively prevent the oxidation and mildew of the content caused by the penetration of oxygen and water vapor, it is widely used in the packaging fields of food, chemicals, daily chemical products and medicines. [0003] Multilayer barrier film bonding resins are essential raw materials in the production of barrier packaging materials. [0004] With the gradual...

AI Technical Summary

Problems solved by technology

Among them, the material that has the greatest impact on the quality and performance of the multilayer barrier packaging film is the multilayer barrier film adhesive resin material contained in it. Currently, PP-g-MAH material is widely used in this type of material. The migration of MAH residues to the packaged food will lead to food safety problems

[0005] In this field, the current common method for detecting the migration of MAH residues of such materials in the industry is high performance liquid chromatography, but the test operation is cumbersome and the cost is high, and it is difficult to achieve rapid determination of a large number of samples; based on the above situation, the selection A suitable and convenient method to monitor and detect the migration of residual sheets in the adhesive resin of multilayer barrier films is particularly important

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