Detection method of hottest solvent residue 0

2022-08-14
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Solvent residue detection method

instrument: gas chromatograph detector (hydrogen flame ion detector)

chromatographic column: 25%feg-1500301 organic support, column length 2m, inner diameter 2mm (professional capillary column can also be used)

conditions: column chamber temperature 90 ℃, detector temperature: 150 ℃, gasification chamber temperature: 150 ℃

1 Detection of solvent residue in packaging materials

use gas chromatograph or instrument with equivalent principle to prepare standard solvent samples according to the types of solvents actually used in production, and take 0.5 with a microliter syringe μ l、1 μ l、2 μ l、

3 μ L and 4 μ L sample, converted to mass. Inject the samples into a clean and dry 500ml triangular bottle sealed with silicone rubber, and put them into a constant temperature oven at 80 ± 2 ℃ for 30

minutes. Then take 1ml of gas from the bottle with a 5ml syringe and inject it into the chromatograph quickly for determination. Make a standard curve with the total peak area and the corresponding sample quality

cut a 0.2m2 sample, which can also be gently removed with a soft brush and quickly cut to 10mm × 30mm fragments are put into a clean 500ml triangular flask preheated at 80 ℃, sealed with a silicone plug, and then sent to a constant temperature oven at 80 ± 2 ℃ for heating for 30 minutes. After that, use a 5ml syringe to take 1ml of gas from the flask and inject it into the chromatograph for determination. Find out the corresponding solvent residue on the standard curve with the total peak area value, and the test results are expressed in mg/m2

2. Detection of ink solvent residue

use gas chromatograph or instrument with equivalent principle to prepare standard solvent according to the solvent type required by the product standard, and use 10% of each solvent μ L the sampler injects 1 into the 300ml infusion bottle through the sealant plug μ L standard solvent, put it into a constant temperature oven at 80 ± 1 ℃ for 20 minutes, take it out, and then put it into a constant temperature oven at 50 ± 1 ℃ for more than 20 hours the next day. After taking it out, use a 1ml syringe to extract 0.2, 0.6, 0.8, 1.0ml of gas plastic film and rubber, wire and cable, steel, glass fiber and other materials from the bottle for testing. The technician of the standard curve laboratory machine should learn how to find problems and clean them up

the ink is made into a printing sample on the biaxially stretched polypropylene film, which is suspended for 2 hours, and the sample is cut into 4 strips with a specification of 5cm × 10cm, with a total area of 200cm2, put it into a 300ml infusion bottle immediately, plug the bottle mouth tightly, put it in a constant temperature oven at 80 ± 1 ℃ for 30 minutes, and extract gas with a 1ml syringe after taking it out. B) after formal production, raw materials, processes, etc. have great changes, which may affect product performance; Inject into the chromatograph for determination, and find out the corresponding solvent residue on the standard curve with the total peak area value. The test result is expressed in mg/m2

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