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Abstract: Material modification is an important way to improve the properties of film materials.
In this paper, the oxygen permeability of polypropylene film before modification and nano-SiOx modified polypropylene film was tested, and the effect of adding nano-SiOx on oxygen barrier of polypropylene material was analyzed.
The influence of performance, and the test principle, test parameters, scope of application, test process, etc.
are introduced to provide reference for the screening of oxygen permeability and modification methods of testing materials in related research and application industries
.
Keywords: oxygen transmission rate, oxygen barrier properties, differential pressure gas permeameter, polypropylene, nano-SiOx modified polypropylene, barrier properties 1.
Meaning High, good wear resistance, high moisture resistance, good chemical resistance and other advantages, but not satisfactory in terms of flexibility, impact resistance, oxygen barrier properties, etc.
, in order to improve the performance of polypropylene materials, improve its use effect, The performance of raw materials is often improved by material modification
.
Material modification methods include grafting modification, copolymerization modification, crosslinking modification, blending modification, etc.
Modified materials include mica, calcium carbonate, EVA and other polymer materials, inorganic nanomaterials, glass fibers, etc.
SiOx is one of the commonly used materials for modified polypropylene materials, which can significantly improve the strength of the material
.
This paper analyzes the influence of this modification method on the oxygen barrier properties of polypropylene materials and the actual effect by testing the oxygen transmission rate of polypropylene materials before and after nano-SiOx modification
.
2.
The test samples are ordinary polypropylene film and nano-SiOx modified polypropylene film
.
3.
Test basis The current test methods for oxygen transmission rate of film materials include differential pressure method and equal pressure method.
In this paper, the principle of differential pressure method is used to test the test samples.
The standard is GB/T 1038-2000 "Plastic Films".
and Sheet Gas Permeability Test Method Differential Pressure Method
.
4.
Test equipment The test equipment used in this test is a VAC-V2 differential pressure gas permeameter, which is independently developed and produced by Jinan Languang Electromechanical Technology Co.
,
Ltd.
4.
1 Test principle The principle of differential pressure method refers to the test method of testing the gas permeability of the sample by maintaining a certain pressure difference on both sides of the sample during the test process, and by testing the pressure change on the low-pressure side
.
The test chamber of the equipment is divided into upper and lower chambers by the clamped sample.
The upper chamber is a high-pressure chamber, which is filled with a certain pressure of test gas, and the lower chamber is a low-pressure chamber.
Through the penetration of the sample into the low-pressure chamber, the gas permeation rate of the sample is obtained by monitoring the change of the pressure in the low-pressure chamber with time
.
4.
2 Test parameters The test range of the equipment is 0.
05 ~ 50,000 cm3/(m2·24h·0.
1MPa), and the vacuum resolution can reach 0.
1 Pa; the temperature control range is 5℃ ~ 95℃, and the temperature control accuracy is ±0.
1℃; humidity control The range is 0%RH, 2%RH~98.
5%RH, 100%RH, and the humidity control accuracy is ±1%RH, which can meet the testing needs of customers under different test conditions; there are three completely independent test chambers, which can test three The same or different samples; data fitting at any temperature can be performed, and test results under very special test conditions can be easily obtained; after modification, this equipment can also support the test of toxic gases, flammable and explosive gases; provide standard The membrane is quickly calibrated to ensure the accuracy and versatility of the test data; it supports the LystemTM laboratory data sharing system to manage the test results and test reports in a unified manner
.
4.
3 Scope of application (1) This equipment is specially used to test the gas permeability, permeability coefficient, solubility coefficient and diffusion coefficient of various film and sheet samples at various temperatures
.
Films include various plastic films, paper-plastic composite films, co-extruded films, aluminized films, aluminum foils, aluminum foil composite films and other film materials
.
Sheets include various engineering plastics, rubber, building materials and other sheet materials, such as PP sheets, PVC sheets, and PVDC sheets
.
(2) The equipment can also be extended to the air permeability test of aerospace materials, paper and cardboard, paint film, glass fiber cloth, glass fiber paper, cosmetic hose sheets, various rubber sheets and other materials
.
(3) This equipment is suitable for the transmission rate test of various gases, such as oxygen, carbon dioxide, nitrogen, helium, air,
etc.
(4) This equipment can meet many national and international standards, such as GB/T 1038, ISO 15105-1, ISO 2556, ASTM D1434, JIS K7126-1, YBB00082003,
etc.
5.
Test process 5.
1 Test of ordinary polypropylene film (1) Cutting samples Three samples with a diameter of 97 mm were cut from the surface of ordinary polypropylene film samples
.
(2) Apply a layer of vacuum grease on the surface of the 3 test chambers of the equipment, and place a piece of filter paper in the test area respectively, and paste the three cut samples on the surface of the test chamber respectively, to exclude the gap between the test chamber and the sample.
air, and clamped with a clamping device
.
(3) Test Set the parameter information such as sample name, thickness, and vacuuming time in the equipment control software, click the test option, turn on the vacuum pump, the test starts, the equipment automatically performs the test according to the set parameters, and the test results are displayed after the test is over.
.
5.
2 Test of nano-SiOx modified polypropylene film According to the cutting-sample-loading-test process in 5.
1, the oxygen permeability of nano-SiOx-modified polypropylene film samples was tested
.
6.
Test results The test results of the ordinary polypropylene film samples tested in this test are 543.
2 cm3/(m2·24h·0.
1MPa), 561.
7 cm3/(m2·24h·0.
1MPa), 549.
1 cm3/(m2 ·24h·0.
1MPa), the average value of the test results for oxygen transmission is 551.
3 cm3/(m2·24h·0.
1MPa), and the test results of nano-SiOx modified polypropylene film samples are 512.
9 cm3/(m2·24h· 0.
1MPa), 520.
7 cm3/(m2·24h·0.
1MPa), 506.
9 cm3/(m2·24h·0.
1MPa), and the average value of the test results is 513.
5cm3/(m2·24h·0.
1MPa)
.
7.
Conclusion From the test results, the oxygen transmission rate of the nano-SiOx modified polypropylene film sample is lower than that of the ordinary polypropylene film sample, indicating that the oxygen barrier performance of the modified polypropylene film has been improved; The deviation between the three test results of the sample is small, and the repeatability is good; from the perspective of the test process, the test process is simple, the equipment is easy to operate, and the degree of automation is high
.
The modification method and modified material used in the material will have different effects on the barrier properties of the material.
The change of barrier properties can be quantified by testing the gas permeability of the material, providing data for the research and development and quality control of modified materials.
basis
.
Jinan Languang Electromechanical Technology Co.
, Ltd.
is a high-tech enterprise specializing in the research and development, production and packaging testing services of packaging testing equipment.
The existing equipment includes water vapor transmission rate tester, oxygen transmission rate detection equipment, gas transmission rate detection equipment, Intelligent electronic tensile testing machine, friction coefficient tester, heat sealing tester, sealing tester, impact tester, etc.
For information about related equipment and testing services, you can visit the website of Jinan Languang Company for specific information or call for consultation
.
The more you know, the more you trust! Labthink is looking forward to enhancing technical communication and cooperation with enterprises and institutions in the industry
.
In this paper, the oxygen permeability of polypropylene film before modification and nano-SiOx modified polypropylene film was tested, and the effect of adding nano-SiOx on oxygen barrier of polypropylene material was analyzed.
The influence of performance, and the test principle, test parameters, scope of application, test process, etc.
are introduced to provide reference for the screening of oxygen permeability and modification methods of testing materials in related research and application industries
.
Keywords: oxygen transmission rate, oxygen barrier properties, differential pressure gas permeameter, polypropylene, nano-SiOx modified polypropylene, barrier properties 1.
Meaning High, good wear resistance, high moisture resistance, good chemical resistance and other advantages, but not satisfactory in terms of flexibility, impact resistance, oxygen barrier properties, etc.
, in order to improve the performance of polypropylene materials, improve its use effect, The performance of raw materials is often improved by material modification
.
Material modification methods include grafting modification, copolymerization modification, crosslinking modification, blending modification, etc.
Modified materials include mica, calcium carbonate, EVA and other polymer materials, inorganic nanomaterials, glass fibers, etc.
SiOx is one of the commonly used materials for modified polypropylene materials, which can significantly improve the strength of the material
.
This paper analyzes the influence of this modification method on the oxygen barrier properties of polypropylene materials and the actual effect by testing the oxygen transmission rate of polypropylene materials before and after nano-SiOx modification
.
2.
The test samples are ordinary polypropylene film and nano-SiOx modified polypropylene film
.
3.
Test basis The current test methods for oxygen transmission rate of film materials include differential pressure method and equal pressure method.
In this paper, the principle of differential pressure method is used to test the test samples.
The standard is GB/T 1038-2000 "Plastic Films".
and Sheet Gas Permeability Test Method Differential Pressure Method
.
4.
Test equipment The test equipment used in this test is a VAC-V2 differential pressure gas permeameter, which is independently developed and produced by Jinan Languang Electromechanical Technology Co.
,
Ltd.
4.
1 Test principle The principle of differential pressure method refers to the test method of testing the gas permeability of the sample by maintaining a certain pressure difference on both sides of the sample during the test process, and by testing the pressure change on the low-pressure side
.
The test chamber of the equipment is divided into upper and lower chambers by the clamped sample.
The upper chamber is a high-pressure chamber, which is filled with a certain pressure of test gas, and the lower chamber is a low-pressure chamber.
Through the penetration of the sample into the low-pressure chamber, the gas permeation rate of the sample is obtained by monitoring the change of the pressure in the low-pressure chamber with time
.
4.
2 Test parameters The test range of the equipment is 0.
05 ~ 50,000 cm3/(m2·24h·0.
1MPa), and the vacuum resolution can reach 0.
1 Pa; the temperature control range is 5℃ ~ 95℃, and the temperature control accuracy is ±0.
1℃; humidity control The range is 0%RH, 2%RH~98.
5%RH, 100%RH, and the humidity control accuracy is ±1%RH, which can meet the testing needs of customers under different test conditions; there are three completely independent test chambers, which can test three The same or different samples; data fitting at any temperature can be performed, and test results under very special test conditions can be easily obtained; after modification, this equipment can also support the test of toxic gases, flammable and explosive gases; provide standard The membrane is quickly calibrated to ensure the accuracy and versatility of the test data; it supports the LystemTM laboratory data sharing system to manage the test results and test reports in a unified manner
.
4.
3 Scope of application (1) This equipment is specially used to test the gas permeability, permeability coefficient, solubility coefficient and diffusion coefficient of various film and sheet samples at various temperatures
.
Films include various plastic films, paper-plastic composite films, co-extruded films, aluminized films, aluminum foils, aluminum foil composite films and other film materials
.
Sheets include various engineering plastics, rubber, building materials and other sheet materials, such as PP sheets, PVC sheets, and PVDC sheets
.
(2) The equipment can also be extended to the air permeability test of aerospace materials, paper and cardboard, paint film, glass fiber cloth, glass fiber paper, cosmetic hose sheets, various rubber sheets and other materials
.
(3) This equipment is suitable for the transmission rate test of various gases, such as oxygen, carbon dioxide, nitrogen, helium, air,
etc.
(4) This equipment can meet many national and international standards, such as GB/T 1038, ISO 15105-1, ISO 2556, ASTM D1434, JIS K7126-1, YBB00082003,
etc.
5.
Test process 5.
1 Test of ordinary polypropylene film (1) Cutting samples Three samples with a diameter of 97 mm were cut from the surface of ordinary polypropylene film samples
.
(2) Apply a layer of vacuum grease on the surface of the 3 test chambers of the equipment, and place a piece of filter paper in the test area respectively, and paste the three cut samples on the surface of the test chamber respectively, to exclude the gap between the test chamber and the sample.
air, and clamped with a clamping device
.
(3) Test Set the parameter information such as sample name, thickness, and vacuuming time in the equipment control software, click the test option, turn on the vacuum pump, the test starts, the equipment automatically performs the test according to the set parameters, and the test results are displayed after the test is over.
.
5.
2 Test of nano-SiOx modified polypropylene film According to the cutting-sample-loading-test process in 5.
1, the oxygen permeability of nano-SiOx-modified polypropylene film samples was tested
.
6.
Test results The test results of the ordinary polypropylene film samples tested in this test are 543.
2 cm3/(m2·24h·0.
1MPa), 561.
7 cm3/(m2·24h·0.
1MPa), 549.
1 cm3/(m2 ·24h·0.
1MPa), the average value of the test results for oxygen transmission is 551.
3 cm3/(m2·24h·0.
1MPa), and the test results of nano-SiOx modified polypropylene film samples are 512.
9 cm3/(m2·24h· 0.
1MPa), 520.
7 cm3/(m2·24h·0.
1MPa), 506.
9 cm3/(m2·24h·0.
1MPa), and the average value of the test results is 513.
5cm3/(m2·24h·0.
1MPa)
.
7.
Conclusion From the test results, the oxygen transmission rate of the nano-SiOx modified polypropylene film sample is lower than that of the ordinary polypropylene film sample, indicating that the oxygen barrier performance of the modified polypropylene film has been improved; The deviation between the three test results of the sample is small, and the repeatability is good; from the perspective of the test process, the test process is simple, the equipment is easy to operate, and the degree of automation is high
.
The modification method and modified material used in the material will have different effects on the barrier properties of the material.
The change of barrier properties can be quantified by testing the gas permeability of the material, providing data for the research and development and quality control of modified materials.
basis
.
Jinan Languang Electromechanical Technology Co.
, Ltd.
is a high-tech enterprise specializing in the research and development, production and packaging testing services of packaging testing equipment.
The existing equipment includes water vapor transmission rate tester, oxygen transmission rate detection equipment, gas transmission rate detection equipment, Intelligent electronic tensile testing machine, friction coefficient tester, heat sealing tester, sealing tester, impact tester, etc.
For information about related equipment and testing services, you can visit the website of Jinan Languang Company for specific information or call for consultation
.
The more you know, the more you trust! Labthink is looking forward to enhancing technical communication and cooperation with enterprises and institutions in the industry
.
