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Adhesive Knowledge

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Why does UV glue turn yellow and how to prevent it?

2025-04-25

Transparent UV glue is essential in various industries, from electronic manufacturing to medical applications, due to its fast curing and long-lasting bonding properties. However, over time, the application of UV glue may experience discoloration, where the cured glue turns yellow. This phenomenon will seriously affect the functional performance and aesthetics of the product. So, why does UV glue turn yellow? How to effectively solve this problem? Now let’s explore the key factors that cause UV glue to turn yellow with Yi Lian, and find ways to alleviate and prevent it! Why UV glue turns yellow and how to prevent itThe yellowing phenomenon of UV glue refers to the gradual discoloration of the originally transparent UV glue due to various factors during use. Here are some of the main reasons for UV glue yellowing:Degradation of UV stabilizers: In order to protect UV adhesives from the effects of ultraviolet (UV) radiation, many manufacturers add UV stabilizers to adhesive formulations. However, prolonged exposure to ultraviolet radiation can lead to the degradation of these stabilizers, reducing their protective effectiveness. Eventually, the adhesive will start to turn yellow and lose its original transparency.Oxidation reaction: Components in UV adhesives, such as resins and additives, are prone to oxidation when exposed to light and oxygen in the air. Oxidation produces peroxide structures and free radicals, leading to discoloration of transparent materials. Oxygen is particularly destructive to materials containing unsaturated double bonds or easily oxidizable functional groups. At high temperatures, oxidation reactions accelerate, and even stable single bonds like C-C can break, leading to yellowing. Long term exposure to strong light or high temperature will further intensify oxidation, making yellowing more severe.Exposure to light and high temperatures: When UV adhesives are directly exposed to sunlight or strong artificial light for a long time, the ultraviolet rays in the…

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Elaplus Science Popularization:Why do Electronic Products Need Thermal Management?

2025-04-18

Up to 55% of electronic product failures are caused by heat Most electronic products, such as power transistors, CPUs, and power diodes, generate a significant amount of heat, which may need to be considered in order to extend their lifespan and improve reliability.During operation, the temperature of electronic components will rise until the heat generated inside the device equals the heat dissipated to the surrounding environment, and the device reaches equilibrium. The temperature may be high enough to significantly shorten the shelf life of components and even cause equipment failure.The result of temperature rise will affect the operation of active and passive components in integrated circuits. If the temperature rises high enough, the heated active or passive components may not function properly or even fail completely. This type of failure includes thermal runaway, junction failure, metallization failure, corrosion, resistance drift, and electromigration diffusion. Therefore, minimizing temperature rise in electronic packaging is crucial.What causes the temperature of electronic packaging to rise? Improve power density and currentThe insatiable demand for higher performance processors has led to a steady increase in power consumption in all segmented markets, such as mobile and high-performance desktops, as well as servers and workstations. The increasing power density and current levels in microprocessors have always been the main heat sources, causing concerns about thermal management of on-chip hotspots, packaging, and interconnect Joule heating.PCB surface component density is higherAnother reason why thermal management of electronic circuit boards has attracted attention is that the electronics industry is witnessing a trend of handheld devices and household appliances becoming thinner and smaller. That’s why PCBs are becoming more compact, and the space between components on electronic PCBs is getting closer, making it harder to transfer heat from PCB components.So what if the radiator is not enough?Maximizing the contact area between the radiator…

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Thermal conductive adhesive suitable for electronic and semiconductor applications

2025-04-18

Efficient thermal management is crucial in electronic and semiconductor manufacturing, as overheating can affect performance and lifespan. Thermal conductive adhesive (TCA) can simultaneously bond components and dissipate heat, providing a disruptive solution without the need for additional mechanical fastening, making it an ideal choice for modern electronic applications.Related article: Frequently Asked Questions about Thermal Conductive Adhesive – Elaplus Electronic Adhesive What is Thermal Conductive Adhesive (TCA)?Thermal conductive adhesive (TCA) is a specialized adhesive that contains thermal conductive fillers (such as alumina, boron nitride, or silver particles) suspended in a polymer matrix in its formula. This type of adhesive has a dual function:Strong adhesion between electronic components.Efficient heat dissipation to prevent overheating.Unlike thermal grease or thermal paste, TCA forms a strong and stable adhesive after curing, and can remain durable for a long time, making it an ideal choice for high-performance electronic applications.The main advantages of thermal conductive adhesiveSimplified assembly process: Unlike thermal paste that requires additional mechanical fastening, TCA can simultaneously bond and dissipate heat, simplifying the assembly process and reducing manufacturing complexity.Enhance heat dissipation: TCA has high thermal conductivity (usually ≥ 1 W/m · K), which can effectively transfer heat from critical components to radiators or cooling systems.Reliable mechanical bonding: These adhesives provide strong adhesion to various substrates, including silicon chips, aluminum, copper, ceramics, and plastics, ensuring long-term stable connections.Improved electrical insulation: Many TCAs have electrical insulation that prevents short circuits while maintaining excellent thermal performance.Durability and environmental resistance: The design of thermal conductive adhesive can withstand:High operating temperature (suitable for power electronics).Mechanical vibration (applicable to automotive and aerospace applications).Humidity, chemicals, and environmental pressure.Save weight and space: By replacing bulky heat sinks, clips, and mechanical fasteners, TCA helps achieve lighter and more compact designs – which is particularly important for small electronic products.The application of thermal conductive adhesive in…

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Detailed Explanation of Thermal Conductive Silicone: Application, Performance, and Optimization Selection

2025-04-18

1、 Introduction to Thermal Conductive SiliconeIn today’s increasingly miniaturized and integrated electronic devices, how to effectively solve the problem of internal heat accumulation in devices has become a technical challenge that urgently needs to be overcome. Thermal conductive silicone, as an efficient thermal conductive material, has emerged in this context and quickly gained widespread application. This article will comprehensively and deeply introduce thermal conductive silicone from multiple perspectives such as definition, classification, and working principle. 1.1 DefinitionThermal conductive silicone is a polymer compound with excellent thermal conductivity and good insulation properties, mainly composed of silicone oil, thermal conductive filler, and a small amount of additives. It can effectively fill the gap between the heating element and the heat sink, reduce the contact thermal resistance, and achieve fast and effective heat transfer.1.2 ClassificationAccording to their different forms, thermal conductive silicone can be divided into two categories: liquid (such as thermal paste) and solid (such as thermal pad); According to the usage scenario, it can be further divided into various types such as universal and specialized.2、 Working principle of thermal conductive siliconeThe reason why thermal conductive silicone can exert excellent heat dissipation effect lies in its unique physical and chemical properties:Low thermal resistance: By optimizing the formula design, the material itself has an extremely low thermal resistance value;Good wettability: It can adhere well to metal surfaces, forming a continuous and uniform thin film layer;Soft and malleable: even in the face of unevenness or small gaps, it can tightly adhere to ensure the best heat conduction path;Long term stability: resistant to high temperature aging, not easy to evaporate and dry, ensuring stable performance for a long time.3、 Application scenariosWith the development of technology, thermal conductive silicone has been widely used in various fields:Consumer electronics products: Used for heat dissipation of key components such…

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Application analysis of bonding sealant: selection guide

2025-04-10

In the modern electronics industry, precision manufacturing and efficient assembly are key to product quality. Whether it’s smartphones, tablets, or industrial devices, a reliable material is needed to ensure the stability and durability of the components. Adhesive sealant, as a multifunctional material, is widely used in the electronics industry due to its excellent performance. This article will delve into the characteristics, application scenarios, and how to choose suitable products for adhesive sealants, providing practical references for industry practitioners. 1、 What is adhesive sealant?Adhesive sealant is a polymer material that combines bonding and sealing functions, usually made of substrates such as silicone, polyurethane, epoxy resin, etc. It has excellent weather resistance, chemical corrosion resistance, and good mechanical strength, and can maintain stable performance in high temperature, low temperature, or humid environments.In the electronics industry, the main functions of adhesive sealant include:Adhesive fixation: firmly fix electronic components in designated positions to prevent loosening or detachment.Sealing protection: prevents moisture, dust, and other pollutants from entering the interior of the equipment, extending the product’s lifespan.Insulation and thermal insulation: Provide electrical insulation and thermal management functions to ensure the safe operation of equipment.2、 Application of adhesive sealant in the electronics industryWith the diversified development of electronic products, the application scenarios of adhesive sealants are becoming increasingly diverse. Here are several typical application areas:Smartphones and tabletsPhone case sealing In the production process of smartphones and tablets, adhesive sealant is used for bonding screens and borders, fixing camera modules, and sealing battery compartments. These parts require extremely high transparency, flexibility, and durability of the adhesive, and high-performance silicone or UV cured adhesives can perfectly meet the needs. LED display screens and lighting equipmentLED shell sealing LED display screens and lighting equipment need to be exposed to outdoor environments for a long time, so there are strict requirements…

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Common problems and application scenarios of RTV silicone rubber

2025-04-01

In the fields of industrial manufacturing, electronic appliances, construction, and automobiles, the demand for sealing, insulation, and protection is ubiquitous. RTV silicone rubber (room temperature vulcanized silicone rubber) has become an indispensable material in modern industry due to its excellent temperature resistance, elasticity, chemical stability, and environmental characteristics. This article will comprehensively analyze the definition, types, performance advantages, and typical application scenarios of RTV silicone rubber, helping you quickly understand the core value of this “versatile” material. 1、 What is RTV silicone rubber?**RTV (Room Temperature Vulcanization Silicone Rubber) is an organic silicone material that can undergo cross-linking reaction (curing) at room temperature. It exists in liquid or paste form and undergoes chemical reactions upon contact with moisture or catalysts in the air, ultimately forming a tough elastic body. According to different curing mechanisms, RTV silicone rubber is mainly divided into two categories:Single component RTV silicone rubber (1K RTV)Ingredients: base polymer+catalyst (such as organotin or organotitanium).Curing method: Slowly cure after exposure to moisture in the air, usually taking 24-72 hours to fully cure.Features: Easy to operate, no need for mixing, suitable for mass production.Two component RTV silicone rubber (2K RTV)Ingredients: Base gel (polymer)+curing agent (catalyst).Curing method: After mixing, it reacts quickly and can be cured within minutes to hours. The curing speed can be adjusted by the ratio.Features: After curing, the mechanical properties are better, suitable for sealing and potting of precision components. 2、 Core performance advantages of RTV silicone rubber 5、 Frequently Asked Questions about RTV Silicone RubberQ1: Will RTV silicone rubber harden after curing?A： After curing, the material maintains elasticity, but the modulus (hardness) of the two-component product can be adjusted, and different hardness can be selected according to needs (such as 20-80 Shore A).Q2： How to avoid incomplete solidification?A： Ensure that the environmental humidity is ≥ 30% (single…

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How to choose the appropriate potting material?

2025-03-21

Choosing the appropriate encapsulation material is crucial for protecting sensitive electronic components from adverse environmental conditions. These materials are used to protect equipment from moisture, provide insulation, and help control heat. Each material has unique advantages through options such as epoxy resin, silicone, and polyurethane, depending on the specific requirements of your application. In this article, Yilian will explore the main differences between these potting materials and help you determine which material is most suitable for your needs, ensuring long-lasting protection and optimal performance. Three common potting materialUnderstanding the unique characteristics of potting materials is crucial when selecting potting materials for your application. The three main sealing materials commonly used in electronic manufacturing are epoxy resin, silicone resin, and polyurethane. Each material has specific advantages and is suitable for different environments and performance requirements. The following is a detailed classification of each sealing material. Epoxy sealant, silicone sealant, polyurethane sealantEpoxy sealant, silicone sealant, polyurethane (PU) sealant

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What is fluorosilicone gel? What is the function of fluorosilicone gel?

2025-03-20

Fluorosilicone gel is a kind of functional polymer with siloxane as the main skeleton and fluorine group introduced into the molecular structure. Due to the introduction of fluorine groups, it has excellent properties such as high temperature resistance, low temperature resistance, chemical corrosion resistance, and low dielectric constant. In recent years, with the increasing trend of miniaturization and high-performance of electronic products, fluorosilicone gel has gradually emerged in the fields of electronic packaging, sealing protection, and heat dissipation and waterproof of electrical components, becoming a new type of polymer material that has attracted much attention. Physical and chemical properties of fluorosilicone gel

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What is the difference between fluorosilicone gel and ordinary silicone gel? Who is more suitable for your needs?

2025-03-20

Chemical Structure and Basic CharacteristicsFluorosilicone gel:Fluorosilicon gel introduces fluorine element (such as trifluoropropyl) into the organic silicon molecular chain, giving it unique properties. The addition of fluorine element enhances the material’s high temperature resistance, corrosion resistance, and waterproof performance.Ordinary silicone gel:The ordinary silicone gel takes the silicon oxygen bond (Si-O) as the main chain, which has good flexibility, temperature resistance and electrical insulation, but has weak adaptability to chemical corrosion and extreme environments.

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