What is adhesive?4 answersAn adhesive is a substance that bonds different materials together, forming a permanent connection through an adhesive bonding process. Throughout history, adhesives have been crucial, with diverse types like bitumen, tree pitches, rubber cements, and modern synthetic components being used for various applications. Adhesive bonding, a key technology of the twenty-first century, offers advantages like no heat load on substrates, bonding of different material combinations, and uniform stress distribution. The development of adhesives has evolved from ancient times, where Egyptians first used glue, to the present focus on eco-friendly and biocompatible options, including those based on nanotechnology and biomimicry. Adhesives require relatively small quantities compared to the weight of the final objects, making them efficient for joining materials.
What is adhesive bonding?5 answersAdhesive bonding is a key joining technology used in various industries such as automotive, aerospace, and microelectronics. It is a process of joining similar or dissimilar materials using adhesive materials. Adhesive bonding provides a practical and versatile method of joining components, especially in applications where composite materials need to be assembled. It offers advantages such as uniform stress distribution, no need for drilling holes, and excellent adhesion to a wide range of substrates. Adhesive bonding is used in the assembly of composite components, including composite pipework, composite/metal structures for large ships, and bonding of stiffeners to sandwich panels. It is also used in the aerospace industry for bonding metallic honeycomb to skins and stringers to skins in aircraft construction. Adhesive bonding is cost-effective, reliable, and can be used as an alternative to traditional joining methods like riveting.
What are the advantages of using alternative materials for making roof sealant?5 answersUsing alternative materials for making roof sealant offers several advantages. These include improved heat resistance, water resistance, mechanical strength, flexibility, and storage stability. Additionally, alternative materials can simplify the preparation process and make the sealant more convenient to use and store. Furthermore, alternative materials can provide good low-temperature resistance, heat insulation, and bonding with various substrates in a roof covering system. They also allow for effective attachment with traditional waterproof and anti-corrosive coatings, easy maintenance and re-coating, and usage as an exposed roof covering waterproof coating, caulking paste, joint sealing paste, or coil edge-sealing paste. Moreover, alternative materials with non-terminal silane groups can offer improved elasticity, cure-through, and other advantages compared to silyl-terminated polymers. Lastly, alternative materials such as dissolved and undissolved natural bio-materials in tire puncture sealant compositions can provide environmentally friendly solutions with long shelf-life and the ability to seal punctures for extended durations.
How does debrisaffect sealing?3 answersDebris can have a significant impact on sealing systems. In non-contacting sealing systems, such as grease-filled labyrinth seals, the grease inside the gaps of the seal must bind pollution particles to effectively seal against them. However, if the surfaces of the grease layers become saturated with particles, further particles entering the system cannot be bound, leading to the need for relubrication. In the presence of abrasives, wear can occur in sealing systems, affecting their performance. Additionally, tamper-evident adhesive seals can be used to reveal evidence of tampering when exposed to UV light, providing a way to detect and prevent unauthorized access to sealed articles and containers. The design of sealing films can also play a role in preventing debris-related issues, with some designs featuring through holes and air valve areas to facilitate ventilation and prevent waste accumulation. Slip sealing structures can improve sealing performance by reducing deformation, minimizing leakage paths, and enhancing pressure-loading capacity, ultimately prolonging the service life of the sealing device.
What is silicone sealant?3 answersSilicone sealant is a type of sealant that is used for sealing and bonding various materials. It is a versatile material that can solidify when exposed to the atmospheric environment and remain in a liquid state when not exposed. Silicone sealants can be prepared using different raw materials and methods depending on their intended application. They can be used for sealing and bonding electronic products, mobile phone screens, electronic appliances, circuit boards, and photovoltaic double-glazed modules. Silicone sealants have various properties such as good room temperature vulcanization, high temperature resistance, yellowing resistance, and excellent adhesion to substrates. They also have good storage stability and do not cause corrosion or pollution to the sealed surfaces. Silicone sealants are widely used in different industries due to their versatility and performance.
What is the function of adhesive in mobile phones?8 answers