Abstract: Rubber gasket is a commonly used sealing device. For food or medical rubber gaskets, the amount of small molecule dissolution has an important impact on the safety of food and medicine. In this paper, Labthink ERT-01 Evaporation Residue Constant Weight Instrument is used to test the content of small molecular substances migrated from food-grade rubber gaskets produced by a company, and the test principle, equipment parameters, application range, test process, etc. A simple description provides a way for companies to detect the amount of dissolved small molecules.
Key words: rubber gasket, small molecular material, evaporation residue, evaporation residue constant weight meter, non-volatile matter, total migration
1, meaning
Rubber gasket is a common gasket for sealing. It has the characteristics of good temperature resistance, aging resistance, oil resistance, acid and alkali resistance, etc. It is commonly used in medicine, electronics, chemical, food and other industries. The main rubber gaskets include silicone mats, butyl rubber mats, fluoro rubber mats, EPDM pads, etc. In order to ensure the good performance of these rubber gaskets, it is inevitable to introduce some small in the process of production. Molecular substances, which slowly migrate outwards. When rubber gaskets come into contact with foods, medicines, etc., especially liquids, greases or high-temperature processed foods and medicines, these substances are likely to migrate to In foods and medicines, food and medicines are polluted, which affects the health of the consumers. Therefore, for rubber gaskets for food or medicine, on the basis of ensuring good gasket performance, the content of small molecular substances contained should be controlled as much as possible to ensure the safety of the foods and medicines that they come into contact with.
Figure 1 Various types of rubber gaskets
2, test samples
This article uses a food grade rubber gasket produced by a company as a test sample.
3. Testing basis
This test process is based on GB/T 5009.64-2003 "Analytical Method for Hygienic Standards for Rubber Gaskets (Rings) for Foods". According to the test process of evaporation residue in this standard, the non-volatiles that can migrate out of the test samples are small. Molecular content (total migration).
4, test equipment
In this paper, the evaporation residue of rubber gasket samples was tested by ERT-01 evaporation residue constant weight meter. The equipment was independently developed and produced by Jinan Languang Electromechanical Technology Co., Ltd.
Figure 2 ERT-01 evaporation residue constant weight meter
4.1 Principle of the test
According to the actual application of the rubber gasket and the type of food contacted, select the appropriate simulant and test conditions, and then simulate the migration test of the rubber gasket according to the test conditions with the simulant. After the migration test, take a certain amount of simulated liquid. Dry in a high temperature oven to a weighted evaporating dish, evaporate on a water bath, dry in a high temperature oven, weigh, dry, weigh, until the weight, the weight minus the empty evaporating dish and blank simulation The amount of residue (total migration) in the rubber gasket can be obtained by the weight of the residue.
4.2 Scope of application
(1) It is suitable for testing the properties of packaging films, container evaporation residues, non-volatile content, etc. of foods, utensils, pharmaceuticals, etc. made of polyethylene, polypropylene, polystyrene, etc.
(2) It is applicable to the testing of evaporation residue of gaskets, gaskets, etc., which are made of natural rubber as the main raw material for sealing of bottled and canned foods, such as various juice drinks, wines, seasonings, etc.
(3) It is suitable for the evaporation residue test of food containers, container interior coatings, coating iron sheets, plant fiber food containers and other materials with perchloroethylene resin as the main raw material in direct contact with food.
(4) Applicable to the evaporation residue test of chemical reagents which can be volatilized at the boiling water bath temperature and removed from the main body.
(5) The instrument meets a variety of national standards, such as GB/T 5009.60-2003, GB/T 5009.64-2003, GB/T 5009.68-2003, GB/T 5009.69-2008, GB/T 5009.203-2003, GB/T 9740-2008 and so on.
4.3 Equipment parameters
Can test 0 ~ 80 g residue quality, test accuracy 0.3 mg;
Temperature control range is 100 ~ 130 °C, temperature control accuracy is ± 0.2 °C;
The hot air circulation wind speed is 0.2 m/s, and the sample volume is 0 ~ 200 mL;
Independent testing of eight samples of a single machine and automatic test process greatly improve the detection efficiency;
Adopt automatic lifting mechanism design and intermittent weighing measurement method to effectively reduce system error;
Test chamber hot air circulation system, unique design for automatic temperature control and moisture removal;
Weighing can be carried out directly under high temperature conditions to avoid the influence of human factors and ensure the accuracy of test results;
Three test modes: proportional, fuzzy and difference, to meet different test needs of users;
With the user-friendly operating interface and intelligent data processing functions, it can be connected to the LystemTM laboratory data sharing system to manage test results and test reports.
5, the test process
(1) Take about 20g of rubber gasket sample into the conical flask, add the simulant to the conical flask according to the requirement of adding 20ml of simulant per gram, soak the specimen, and hold the sample and the simulant. The Erlenmeyer flask was placed under the selected test conditions for the migration test.
(2) The evaporating dish is placed in the corresponding tray rack of the evaporation residue constant weight meter according to the number to carry out constant weight, and the instrument automatically records the weight of each evaporating dish.
(3) After the end of the migration test, take 200 mL of each simulant from the Erlenmeyer flask and place it in two evaporating dishes with constant weight, and take another 200 mL blank simulant into another constant weight evaporation. In the dish, do a blank test.
(4) Place the three evaporating dishes in a water bath to dry, then transfer them to the tray holder corresponding to the evaporation residue constant weight meter, close the test chamber door, set the reference cup, test cup number, and dry temperature setting. For 100 ° C, the weighing interval is 1 h, and the difference test mode is selected. The difference is 0.3 mg, that is, when the weight difference between the two sides of the current weighing is less than 0.3 mg, it is considered that the constant weight is reached. Click on the test option and the test begins.
(5) The equipment automatically performs the constant weight process according to the set conditions. When the constant weight condition is reached, the equipment automatically stops the test and automatically calculates and displays the amount of evaporation residue in the two test cups according to the weight of each evaporating dish. .
6, test results
According to the use of the rubber gasket tested, the selected simulant was water, and the migration test conditions were immersed for 0.5 h under the condition of 60 ° C, and the evaporation residue (total migration) of the final test sample was 11.3 mg / L.
7. Conclusion
The content of non-volatile small molecular substances contained in the rubber gasket directly contacting food and medicine is an important factor related to the safety of food and medicine. The ERT-01 evaporation residue constant weight meter is a non-volatile small molecule substance in the detection material. The amount of dissolution (total migration) has the advantages of simple operation, high intelligence, accurate and reliable test results, and avoids the cumbersome human operation process and its influence on the test results. Jinan Languang Electromechanical Technology Co., Ltd. is a high-tech enterprise specializing in R&D, production and packaging testing services for packaging inspection equipment. It is committed to providing high-end, sophisticated testing equipment and accurate and efficient testing services to customers around the world. The group has been involved in many industries and fields such as food, medicine, packaging materials, automobiles, cosmetics, daily chemicals, chemicals, third-party testing institutions, high-efficiency and scientific research institutes. You can visit the relevant testing equipment and testing services. The more you understand, the more you trust! Labthink is looking forward to enhancing technical communication and cooperation with enterprises and institutions in the industry!
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