Abstract: Waterproof and breathable membranes are widely used in construction, automotive, medical, daily chemical, textile, electronic communication and other industries. They can effectively protect products from external moisture or other liquids. Therefore, waterproof and breathable membranes should have high moisture resistance. In this paper, the barrier properties of Labthink W3 / 031 water vapor transmission rate tester waterproof membrane water vapor on the outside, and describes the contents of the scope of application, and other parameters of the basic equipment and test procedure of the test equipment, companies select permeable Wet performance test equipment and test methods can be referred to.
Key words: waterproof and breathable membrane , composite membrane, moisture resistance, moisture resistance, weighing method, water vapor transmission rate, water vapor transmission rate tester
1 , meaning
The barrier property to external water vapor (ie, moisture barrier) is an important performance index for various materials such as building materials. It can be tested to analyze the water vapor transmission rate of materials to prevent problems such as aging and corrosion caused by water vapor.
Waterproof and breathable membrane (also known as Puwei waterproof breathable membrane) is a new type of polymer waterproof material used in different industries. For example, the construction industry is designed to prevent moisture from escaping and protect the thermal performance of maintenance structures. It is designed to provide long-term protection for the lights from external moisture, dust, oil and other contaminants, and to reduce the gas on the seals because of its unique and unique venting function. Pressure to extend the life of automotive parts. It is obvious that the waterproof and breathable membrane should have high waterproof performance. Therefore, all production enterprises should strengthen the regular detection of the water vapor transmission rate of the waterproof and breathable membrane.
Figure 1 waterproof breathable membrane
2 , reference standard
At present, the test methods for water vapor transmission rate of waterproof and breathable membranes include weighing method ( cup method ) , electrolysis method, humidity method and infrared method. The standard methods for reference are GB 1037-1988 . Plastic film and sheet. Water vapor permeability test method cup method, GB/T 21529-2008 "Determination of water vapor transmission rate of plastic film and sheet - Electrolytic sensor method", GB/T 30412-2013 "Plastic film and sheet water vapor transmission Rate Determination of Humidity Sensor Method, GB/T 26253-2010 " Infrared Detector Method for Determination of Water Vapor Transmission Rate of Plastic Films and Sheets ". This article refers to the standard GB 1037-1988 based on the weighing method .
3 , test samples
A waterproof and breathable membrane provided by a company.
4 , testing equipment
As employed herein detecting apparatus of Labthink W3 / 031 water vapor transmission rate tester.
Figure 2 W3/031 water vapor transmission rate tester
4.1 Test principle
This equipment adopts the weighing method test principle. During the test, the sample is clamped in the moisture permeable cup, and a certain humidity difference is formed on both sides of the sample. The water vapor will pass through the high humidity side under the action of the humidity difference. The sample is infiltrated into the low-humidity side, and by measuring the change in the weight of the moisture-permeable cup over time, the parameters such as the water vapor transmission rate of the sample can be obtained.
4.2 Scope of application
(1) This equipment is suitable for testing the water vapor transmission rate of films, sheets, paper, cardboard, textiles, non-woven fabrics and other materials.
Film type: various plastic film, waterproof and breathable film, plastic composite film, paper-plastic composite film, geomembrane, co-extruded film, aluminized film, aluminum foil, aluminum-plastic composite film and other film-like materials.
Sheets: sheet materials such as PP , PVC sheet, PVDC sheet, nylon sheet, etc.
(2) This equipment can also be extended to the test of the cupping method of the sample and the water vapor transmission rate test of the liquid crystal display film, the solar backing plate, the sterile protective film, the cosmetic mask and the like.
(3) This equipment meets many national and international standards, such as GB 1037 , GB/T 16928 , ISO 2528 , ASTM E96 , ASTM D1653 , TAPPI T464 , DIN 53122-1 , JIS Z0208 , YBB00092003, etc.
4.3 Equipment parameters
- The test range of the device is 0.1 ~ 10000 g / m 2 · 24h , and the resolution is 0.01 g / m 2 · 24h .
- The temperature control range of the equipment is 15 °C ~ 55 °C , the temperature control accuracy is ±0.1 °C , the humidity control range is 10%RH ~ 98%RH , and the humidity control accuracy is ±1%RH .
- The device is equipped with three moisture permeable cups, and the three moisture permeable cups can be tested independently.
- The system adopts an intermittent weighing method that meets the standard requirements, and ensures a constant humidity difference inside and outside the moisture permeable cup through the standard purge wind speed.
- The device provides two quick calibration methods for standard film and standard weight to ensure the accuracy and versatility of the test data.
- The equipment supports the test results comparison. The user sets the standard value and error range before the test starts. After the test is completed, the system automatically judges whether the test results are within the standard error range and intuitively informs the user.
- Support Lystem TM laboratory data sharing system, test data and device information can be reported simply by setting and operation, and easy to realize centralized and systematic management of laboratory test data.
5 , the test process
(1) Three pieces of a sample having a diameter of 74 mm were cut out from the surface of the sample .
(2) The sample pieces are respectively clamped in three moisture permeable cups, and then placed on the moisture permeable cup holder inside the device, and the test chamber door is closed.
(3) Set the sample name, sample thickness, test temperature, test humidity and other parameters, click the " Start Test " option.
(4) After the test is over, the instrument automatically calculates and displays the test results.
6 , test results
The water vapor transmission rates of the three samples tested in this paper were: 4307.12 g / (m 2 · 24h) , 4382.67 g / (m 2 · 24h) , 4408.86 g / (m 2 · 24h) .
7 , conclusion
W3/031 Water Vapor Transmission Rate Tester is a water vapor transmission rate tester specially designed for waterproof and breathable membrane testing. It has simple operation, high test accuracy and good repeatability. It can truly reflect the waterproof and breathable membrane material. Humidity resistance. As a leader, Labthink packaging testing equipment R & D and manufacturing, has always been committed to customers around the world to provide professional, high-end packaging and testing equipment and testing services. The more you understand, the more you trust! Jinan Languang Electromechanical Technology Co., Ltd. is willing to enhance technical exchanges and cooperation with enterprises and institutions in the industry.
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