Test method for oxygen resistance of protein membrane
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Last Update: 2017-12-26
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Source: Internet
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Author: User
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Abstract: protein membrane is a kind of green packaging material, which has a broad development space in the form of advocating environmental protection In this paper, taking a wheat protein membrane as an example, we use Labthink blue ox2 / 230 oxygen permeability test system to test its oxygen permeability, which overcomes the fragile characteristics of the protein membrane, and through a brief introduction of the test principle, equipment parameters, scope of application, test process, etc., we can provide a practical method for the test of the oxygen resistance of protein membrane samples Key words: oxygen transmittance, oxygen permeability test system, oxygen resistance performance, protein membrane temperature, humidity 1, significance Protein membrane, as the name implies, is made of animal protein isolate or plant protein isolate as the main raw material and added with plasticizer, cross-linking agent and other additives The common protein membrane includes whey protein membrane, wheat gluten protein membrane, soybean protein isolate membrane, corn gliadin membrane, flower protein isolate membrane and so on According to the type and application field of protein membrane, the membrane forming method includes pouring Casting film, coating or spray forming film, extruding film and so on Protein film is a kind of edible and degradable film, which can be used in product packaging, especially in food packaging It can effectively solve the hidden danger of food safety caused by plastic packaging, and reduce the burden of plastic packaging waste on the environment Therefore, the application and research and development of protein film materials have become a hot research topic In view of the fact that oxygen is the cause of oxidation, deterioration, mildew and other quality problems in food One of the inducements is that the oxygen resistance is an important performance of protein film as food packaging Due to the characteristics of its own structure, protein membrane is usually sensitive to humidity When the ambient humidity is low, it is easy to lose water and break up When the humidity is high, it is easy to absorb water and adhere Therefore, the control of test conditions is particularly important in the test of oxygen permeability 2 In this test, the wheat protein membrane developed by an enterprise is used as the test sample 3 At present, there are two testing methods for oxygen permeability, i.e equal pressure method and differential pressure method In order to prevent the sample from being damaged due to the unequal pressure on both sides, the equal pressure method is adopted in this test, and the corresponding standard is GB / T 19789-2005 test method for oxygen permeability of plastic film and sheet by coulometer 4 The test equipment used in this test is ox2 / 230 oxygen transmittance test system, which is independently developed and produced by Jinan Languang Electromechanical Technology Co., Ltd Figure 4.1 test principle of ox2 / 230 oxygen transmittance test system 4.1 isobaric method, also known as coulometer test method, the former describes the gas pressure on both sides of the sample, and the latter describes the test method used During the test, the sample is clamped between the test gas chamber and the test chamber The flow in the test gas chamber is high-purity oxygen The carrier gas flowing in the test chamber is high-purity nitrogen with equal pressure According to the principle of gas diffusion, oxygen will penetrate into the test chamber through the test gas chamber under the effect of concentration difference, and be carried to the coulometer sensor by nitrogen for oxygen concentration analysis The oxygen transmittance and other parameters of the sample are obtained 4.2 equipment parameters the test range of thin film samples is 0.01-6500cm 3 / (M 2 · d), the resolution is 0.001cm3 / (M2 · d), the test range of container samples is 0.0001-60cm3 / (PKG · d), the resolution is 0.00001 cm3 / (PKG · d) Three identical or different samples can be tested at the same time The system Zui can support parallel connection of 10 instruments and establish a system for simultaneous test of 30 samples The temperature control range is 15-55 ℃, and the temperature control accuracy is ± 0.1 ℃ The humidity control range is 0% RH, 35% RH ~ 90% RH, and the humidity control accuracy is ± 1% RH Wide range, high precision temperature and humidity control range, both sides of the sample can be humidified to achieve the test under different temperature and humidity conditions The first pressure compensation technology of global Ling ensures the high accuracy and repeatability of the test results It can be combined with the water vapor transmittance test system to form a hybrid test system, which is controlled by a computer to realize the simultaneous measurement of oxygen and water vapor transmittance Support Lystem TM laboratory data sharing system, and manage test results and test reports in a unified way Scope of application the equipment is suitable for testing the oxygen permeability of various types of samples, including film, such as plastic cover film, plastic composite film, paper plastic composite film, coextrusion film, aluminum coating film, aluminum foil, aluminum plastic composite film and other film materials; sheet, various engineering plastics, rubber, building materials and other sheet materials, such as PP sheet, PVC sheet, PVDC Sheet materials, etc.; containers, bottles, bags, cans, boxes and barrels made of various plastic, rubber, paper, paper plastic composite, glass, metal and other materials, such as Coke bottles, peanut oil barrels, Tetra Pak packaging, vacuum packaging bags, metal three cans, plastic cosmetics packaging, toothpaste hoses, jelly cups, yogurt cups, etc It can meet iso15105-2, GB / t19789, ASTM d3985, ASTM f2622, ASTM f1307, ASTM f1927, JIS k7126-2, ybb00082003 and other national and international standards 5 During the experiment (1) three samples were cut from the wheat protein membrane with a sampler Clamp the three cut samples in three infiltration tanks of the equipment (2) Set the test parameters such as test temperature, humidity, sample name and thickness, select the test mode, click the test option, and the test starts In order to prevent the sample from breaking during the test, the temperature and humidity of this test are set as 23 ℃ and 60% RH respectively Adjust the gas flow to make the humidity in the infiltration tank reach the set value (3) After the test, the equipment automatically displays the test results of three samples Purge the pipeline and shut down the equipment 6 The results showed that the oxygen permeability of the three samples was 7651.3241cm 3 / (m 2.24h), 7670.0569cm3 / (m2.24h) and 7656.3753cm3 / (m2.24h) The average value of the three test results was 7659.2521cm3 / (m2.24h) 7 Conclusion it is very important to control the test conditions in the test of oxygen permeability of protein membrane, otherwise it is easy to break and lead to the failure of the test Three test results can be obtained in one test of ox2 / 230 oxygen permeability test system, which greatly improves the test efficiency The repeatability and stability of the test results are good, which can accurately reflect the oxygen permeability of the tested protein membrane samples By controlling the test conditions, the samples are not damaged in the test process Jinan Languang mechanical and Electrical Technology Co., Ltd is a high-tech enterprise specializing in the production, R & D and testing services of packaging testing equipment Currently, the testing equipment developed covers the material's barrier performance to oxygen, nitrogen, water vapor, carbon dioxide and other gases, stretching, impact resistance, puncture resistance, friction performance, rubbing resistance, sealing performance, evaporation residue, solvent residue The performance test can be used in many fields, such as food, medicine, chemical industry, daily chemical products, automobile, packaging material manufacturing enterprises, etc to understand the relevant testing equipment and testing services, you can call Jinan Languang for details The more you understand, the more you trust! Labthink is looking forward to enhancing technical exchanges and cooperation with users in various industries.
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