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    Home > Active Ingredient News > Drugs Articles > Test plan for moisture resistance of thermal conductive silica gel sheet

    Test plan for moisture resistance of thermal conductive silica gel sheet

    • Last Update: 2018-04-03
    • Source: Internet
    • Author: User
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    Abstract: the humidity resistance is an important factor affecting the performance of thermal conductive silicon film This paper introduces a test method for the moisture resistance of thermal conductive silicon film by testing the water vapor transmittance of a brand of thermal conductive silicon film, and introduces the test principle and equipment W3 / 330 The description of the parameters, application scope and test process of the water vapor transmittance test system provides a reference for the enterprise to test the moisture resistance of the thermal conductive silicon film Key words: moisture resistance, water vapor transmittance, heat conducting silica gel sheet, water vapor transmittance test system, electrolysis 1, significance Thermal conductive silica gel sheet is a kind of thermal conductive medium material, which is based on silica gel and added with metal oxide and other auxiliary materials This material is filled into the gap between the heat source and the radiator to form a good heat dissipation path between them Thermal conductive silicon wafers are widely used in LED industry, power industry, communication industry, automotive electronics industry, home appliance industry and other fields, such as the connection between the main board chip of notebook computer and the radiator for heat dissipation Because the internal components of electronic products are sensitive to water vapor, preventing internal moisture in the use process is the prerequisite to ensure the service life and performance of the products When the thermal conductive silicon film is used between the electronic chip and the radiator, the electronic chip can be sealed in a closed environment, and the thermal conductive silicon film, as a part of the sealing material, has the water vapor barrier property The energy level will directly affect the amount of water vapor that the electronic chip can contact Therefore, it is of great significance to choose the suitable thermal conductive silica gel sheet to prevent electronic products from moisture Fig 1 test basis for thermal conductive silicon film 2 At present, the test methods for water vapor transmission of materials are mainly divided into four methods: cup method, electrolytic sensor method, infrared sensor method and humidity sensor method In this paper, electrolytic sensor method is used to test the water vapor transmission of thermal conductive silicon film, and the method standard is GB / T 21529-2008 Plastics film and sheeting - Determination of water vapor transmittance - Electrolytic sensor method 3 Test sample the sample tested in this test is a brand of thermal conductive silica gel 4 This paper uses W3 / 330 water vapor transmittance test system as the test equipment, which is independently developed and produced by Jinan Languang Electromechanical Technology Co., Ltd Fig 2 W3 / 330 water vapor transmittance test system 4.1 test principle after the sample is clamped into the permeation chamber, the permeation chamber is divided into low humidity chamber and high humidity chamber The dry nitrogen flows in the low humidity chamber, and the nitrogen with certain humidity flows in the high humidity chamber The water vapor entering the low humidity chamber through the sample from the high humidity chamber is carried into the electrolytic cell by nitrogen The structure of the cell is usually: there are two spiral metal electrodes inside, the electrodes are installed on the inner wall of the glass capillary, and the surface of the electrodes is coated with a thin layer of phosphorus pentoxide The nitrogen gas passes through the glass capillary, and the water vapor carried by it is absorbed quantitatively by phosphorus pentoxide By applying a certain DC voltage to the electrode, the water vapor is electrolyzed into hydrogen and oxygen According to the value of electrolytic current, the amount of water vapor passing through the sample per unit area in unit time is calculated 4.2 scope of application (1) this equipment is applicable to the water vapor transmission test of plastic sheet, film, paper, cardboard, composite material, container and other packaging materials Sheet materials include various engineering plastics, rubber, building materials and other sheet materials, such as PP sheet, PVC sheet, PVDC Sheet, etc.; paper, cardboard samples, such as cigarette pack aluminum coated paper, paper aluminum plastic composite sheet, etc.; film materials include all kinds of plastic film, paper plastic composite film, CO extrusion film, aluminum coating film, aluminum foil, aluminum foil composite film, glass fiber aluminum foil composite film, etc.; containers include bottles, bags, cans, boxes, barrels made of plastic, rubber, paper, paper plastic composite, glass, metal and other materials, such as Coke bottle, peanut oil barrel, Tetra Pak packaging, vacuum packaging bag, metal three piece can, plastic cosmetic hose packaging, toothpaste hose packaging, jelly cup, etc In addition, the special device of the equipment can also be used for the water vapor transmission test of special packaging such as pharmaceutical packaging, automobile oil tank, battery plastic shell, plastic pipe, solar backboard, etc (2) This equipment can meet many national and international standards, such as GB / T 21529, ISO 15106-3, DIN 53122-2, YBB 00092003 4.3 test range of equipment parameters: film test 0.001 ~ 40 g / (M 2 · 24 h), and can be extended to 0.01 ~ 1000 g / (M2 · 24 h), container test 0.0001 ~ 0.2 g / (PKG · d); number of samples: 1 ~ 3 (data are independent); resolution: film 0.001 g / (M2 · 24 h), container 0.00001 g / (PKG · d); test temperature range: 15 ℃ ~ 55 ℃, temperature control accuracy ± 0.1 ℃; test humidity range: 0% RH, 35% RH ~ 90% RH, 100% RH, humidity control accuracy ± 1% RH; system Zui can support parallel connection of 10 instruments and establish a system for simultaneous test of 30 samples; It can be combined with the oxygen transmittance test system to form a hybrid test system, which is controlled by a computer to achieve a convenient test mode of simultaneous testing of water vapor and oxygen transmittance It supports the Lystem TM laboratory data sharing system to manage test results and test reports in a unified way 5 During the test (1), three samples were cut with a special sampler (2) Install three pieces of samples on three test chambers of the equipment and clamp them to ensure good sealing and no air leakage (3) Set the parameters such as sample name, sample thickness, test temperature and test humidity, click the test option, and the test starts (4) Start the air source, adjust the nitrogen flow and nitrogen pressure to make the humidity and nitrogen flow of the test chamber reach the specified value (5) After the test, the instrument automatically calculates and displays the test results 6 Results the water vapor transmittance of the three samples was 8.034 g / (M 2 · 24h), 7.981 g / (M2 · 24h) and 8.116 g / (M2 · 24h), with an average of 8.044 g / (M2 · 24h) 7 Conclusion the water vapor transmission rate of thermal conductive silicon film is one of the important factors that affect the service life and performance of electronic equipment In this paper, the water vapor transmission rate of a brand of thermal conductive silicon film is tested by the electrolytic sensor method The test operation is simple, and the equipment is highly intelligent The test results show that the sample has good uniformity and high test accuracy Jinan Languang mechanical and Electrical Technology Co., Ltd is a high-tech enterprise specializing in the research and development, production and testing services of packaging testing equipment The existing equipment can test the barrier performance, tensile performance, puncture resistance, smoothness, impact resistance, heat sealing performance, sealing performance and solvent residue of packaging materials for oxygen, water vapor, nitrogen, air, carbon dioxide and other gases , total migration and other performance indicators 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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