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Preparation method for polymer film for food contact in migration test

A polymer film and food contact technology, which is applied in the field of preparation of polymer films for food contact, can solve the problems of small additive content, uneven distribution of additive content, low mixing uniformity of additive and polymer pellets, etc. Uniform distribution, fast film formation, and easy operation

Inactive Publication Date: 2015-06-24
王利兵 +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the low uniformity of mixing the additives with the polymer pellets, the content distribution of the additives in the obtained polymer film is not uniform, and will eventually affect the parallel comparison results of the migration test of the polymer film; secondly, industrial production The content of additives in the obtained polymer film is small. During the migration test and subsequent detection process, due to the limitation of the detection method and the sensitivity of the detection instrument, the migration behavior of the additive in the polymer film cannot be obtained.

Method used

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  • Preparation method for polymer film for food contact in migration test
  • Preparation method for polymer film for food contact in migration test
  • Preparation method for polymer film for food contact in migration test

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Weigh 10 grams of polystyrene pellets and add them to a 250ml conical flask with a stopper, then add 100ml of toluene and shake well. After about 24 hours, after the polystyrene pellets are completely dissolved in toluene, weigh 0.2 grams The oxygen indicator platinum octaethylporphyrin (PtOEP) was added to the above polystyrene toluene solution, and a mixed solution was formed after it was completely dissolved. Take a polymer composite septum with a diameter of 2 cm and place it horizontally on the platform, accurately absorb 0.5 ml of the mixed solution with a straw, and slowly add it dropwise on the polymer composite septum. Spread out on the polymer composite cadmium pad to form a solution layer with uniform thickness. The polymer composite spacer covered with the mixed solution layer is placed in the atmospheric environment, and after the organic solvent in the mixed solution layer evaporates to dryness, the preparation of the polymer film containing the migration ...

Embodiment 2

[0035] Weigh 5 grams of polyvinyl chloride pellets and add them to a 250 ml conical flask with a stopper, then add 100 ml of tetrahydrofuran and shake well. After about 18 hours, after the polyvinyl chloride pellets are completely dissolved in tetrahydrofuran, weigh 0.2 Add the time-temperature indicator spiropyran (SP) of 1 g into the above-mentioned polyvinyl chloride tetrahydrofuran solution, and form a mixed solution after being completely dissolved. Take a polymer composite spacer with a diameter of 2 cm and place it on the rotating platform in the spin coater, then add 0.5 ml of mixed solution in the spin coater, start the spin coater, and control the rotation speed of the spin coater so that the spray coating is in the polymerization state. The mixed solution on the composite septum just covers the entire septum. After the spin coating is completed, the polymer composite spacer is placed in the atmospheric environment, and after the organic solvent in the mixed solution...

Embodiment 3

[0037] Weigh 10 grams of polyethersulfone pellets and add them to a 250 ml conical flask with a stopper, then add 100 ml of chloroform and shake well, and wait for about 24 hours after the polyethersulfone pellets are completely dissolved in chloroform, Weigh 0.2 g of the time-temperature indicator spirooxazine (SO) and add it to the polyethersulfone chloroform solution, and form a mixed solution after being completely dissolved. Weigh 10 g of polyethersulfone pellets and add to another 250 ml conical flask with a stopper to prepare a pellet solution. Take a polymer composite septum with a diameter of 2 cm and place it horizontally on the platform, accurately draw 0.5 ml of the mixed solution with a straw, and slowly add it dropwise on the polymer composite septum. After the addition is completed, a mixed solution layer will be spread. The polymer composite spacer is placed in the atmosphere, and after the organic solvent in the mixed solution layer evaporates to dryness, draw...

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Abstract

The invention relates to a preparation method for a polymer film for food contact, and particularly relates to a preparation method for a film for a migration test in a food contact material migration model. Polymer grains and a to-be-detected migration object are added in an organic solvent in a certain ratio, and adequately dissolved to form a mixed solution with viscosity; a certain amount of the mixed solution is taken, and dripped on a polymer composite isolation pad with the diameter of 2-5 centimetres, or the polymer composite isolation pad is placed in a spin coater, the mixed solution is added in the spin coater, and the spin coater is started. The polymer composite isolation pad dripped or sprayed with the mixed solution on the surface is placed in an atmospheric environment, and after the organic solvent in the mixed solution is volatilized, the polymer film containing the to-be-detected migration object is formed on the polymer composite isolation pad. Different from blowing moulding, calendering moulding, tape-casting moulding or stretching moulding for a polymer film, the preparation method disclosed by the invention has the advantages that preparation for the polymer film can be finished on a substrate with small dimensions, and moreover, the thickness of the obtained polymer film and the content distribution of the to-be-detected migration object are uniform, thus laying the foundation of a parallel test in the further migration test.

Description

technical field [0001] The invention relates to a preparation method of a polymer film for food contact, in particular to the preparation of a film for migration test in a migration model of food contact materials. Specifically, after using an organic solvent to dissolve the mixture of the polymer pellets and the migration to be detected, the formed mixed solution is prepared on the polymer composite spacer to form a polymer film by dropping or spin coating. technical background [0002] The rapid development of modern food contact materials enables traditional fresh food that is difficult to store, has a short shelf life, and is inconvenient to transport to break through the constraints of time and space, and present it to consumers conveniently and quickly, thereby providing a stable guarantee for the improvement of people's material living standards . In recent years, the application of functional food contact materials in the field of food processing has broken through ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/18
Inventor 王利兵韩伟于艳军
Owner 王利兵
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