Polyurethane glue The difference between , epoxy resin glue and silicone glue
Potting glue is also called electronic Glue is a relatively broad term. Mainly used for sealing and bonding of electronic components, which can enhance the overall performance of electronic components, improve the resistance of electronic components to vibration, and prevent electronic components from being directly exposed to the air. Among them, it plays the role of dust-proof and moisture-proof. Currently there are many varieties of electronic potting glues on the market. In terms of material types, there are currently three most common potting glues, namely polyurethane potting glue and epoxy potting glue. glue and silicone rubber potting glue.
So, what are the differences between these three types of glue, and what are their advantages and disadvantages? The editor of Weigu will explain it to you.
1, polyurethane potting glue.
Definition:Urethane potting glue is composed of polyester, polyether and other oligomer polyols and polyisocyanate, with binary Alcohol or diamine is a chain extender, which is prepared through step-by-step polymerization.
Advantages ：Polyurethane potting glue It has excellent low temperature resistance, colloid The hardness range is wide, and the hardness range of polyurethane can range from Shore A10 to Shore D80 Song Dynasty”>. has good properties for general potting materials The adhesiveness of Adhesionhigher, good wear resistance, HaveveryGood insulation. It has strong tensile strength, high stability, low odor, and little environmental pollution. It is a new environmentally friendly material. Can Improving the resistance of electronic devices to vibration can prevent electronic devices from being directly exposed to the air, thus preventing Dust and moisture-proof function.
Disadvantages：Polyurethane potting glueHigh temperature resistanceComparisonPoor , cannot be in a high temperature environment for a long time, otherwise it will affect the time As a result, long-term exposure to UV rays will also affect the service life. Polyurethane sealants also have poor alkali resistance.
Application scope<spaAfter potting and curing, the epoxy resin cannot be opened due to its high hardness,therefore the product For“Lifetime”Product, components cannot be implemented Replacement. Transparent epoxy resin material has general weather resistance Poor. Easy to occur under light or high temperature conditions font>turns yellow.
Application scope：一is generally used for potting of non-precision electronic devices such asLED, voltage regulators, industrial electronics, relays, controllers, power modules, etc.
3, silicone rubber potting glue.
Definition:Silicate gel is a highly active adsorption material and is an amorphous substance. The main component of silica gel is silica, which is chemically stable and does not burn.
Advantages:Organic silicone potting glue has stable physical and chemical properties, good high and low temperature resistance, and can be used at -40~200 long-term work within the ℃ range. Excellent weather resistance, it can still play a good protective role for more than 2020years outdoors and is not easy to yellow . It has excellent electrical properties and insulation capabilities. After potting, it can effectively improve the insulation between internal components and circuits, and improve the stability of electronic components.
Disadvantages:Compared to polyurethane glue and epoxy glue, the bonding performance of general silicone rubber is slightly worse. Silicone rubber has poor mechanical properties such as tensile strength and shear strength. Its physical and mechanical properties at room temperature are inferior to those of most synthetic rubbers, and general silicone rubber has poor oil and solvent resistance.
Application scope: Suitable forLED, display screens, photovoltaic materials, diodes, semiconductor devices, relays, sensors, automotive ballastsHIV, vehicle-mounted computerECU, etc., mainly starting from Insulating, moisture-proof, dust-proof and shock-absorbing.
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