Adhesives, firmly connect two or more adhesive materials that have been surface-treated and have chemical properties with a certain mechanical strength. For example, epoxy resin, phosphoric acid copper monoxide, white latex, etc. This connection can be permanent or removable, depending on the type of adhesive and application needs.
From the perspective of chemical composition, adhesives are mainly composed of adhesives, diluents, curing agents, fillers, plasticizers, coupling agents, antioxidants and other auxiliaries. These ingredients together determine the properties of the adhesive, such as viscosity, curing speed, strength, heat resistance, weather resistance, etc.
Types of adhesives
I.Polyurethane adhesive
Highly active and polar. It has excellent chemical adhesion with base materials containing active gas, such as foam, plastic, wood, leather, fabric, paper, ceramics and other porous materials, as well as metal, glass, rubber, plastic and other materials with smooth surfaces.
II.Epoxy resin adhesive
It is formulated from epoxy resin base material, curing agent, diluent, accelerator and filler. It has good bonding performance, good functionality, relatively low price and simple bonding process.
III.Cyanoacrylic adhesive
It needs to be cured in the absence of air. The disadvantage is that the heat resistance is not high enough, the curing time is long, and it is not suitable for sealing with large gaps.
IV.Polyimide based adhesive
A high-temperature-resistant seed-holding adhesive with excellent heat resistance and can be used continuously at 260°C. It has excellent low-temperature performance and insulation. The disadvantage is that it is easily hydrolyzed under alkaline conditions.
V.Phenolic resin adhesive
It has good heat resistance, high bonding strength, good aging resistance and excellent electrical insulation, and is cheap and easy to use. But it’s also the source of formaldehyde smell in furniture.
VI.Acrolein-based adhesive
When applied to the surface of an object, the solvent will evaporate, and the moisture on the surface of the object or from the air will cause the monomer to rapidly undergo anionic polymerization to form a long and strong chain, bonding the two surfaces together.
VII.Anaerobic adhesives
It will not solidify when in contact with oxygen or air. Once the air is isolated, coupled with the catalytic effect of the metal surface, it can polymerize and solidify quickly at room temperature, forming a strong bond and a good seal.
VIII.Inorganic adhesive
It can withstand both high temperature and low temperature and has low cost. Not easy to age, with simple structure and high adhesion.
IX.Hot melt adhesive
A thermoplastic adhesive that is applied in a molten state and then bonded when cooled to a solid state. In daily life, it can be used as the book binding material.
When selecting an adhesive, you need to consider factors such as the nature of the adherend, the curing conditions of the adhesive, the use environment and economy. For example, for occasions that need to bear larger loads, structural adhesives with high strength should be selected; for applications that need to cure quickly, adhesives with fast curing speed should be selected.
In general, adhesives play an important role in modern industrial production and daily life. They not only simplify the connection process and reduce costs, but also improve the quality and reliability of products. With the advancement of science and technology and the improvement of environmental awareness, future adhesives will be more environmentally friendly, efficient and multi-functional.
After briefly understanding what adhesive is and its types, another question may come into your mind. What kind of materials can be used with adhesives? Please wait and see in the next article.
Post time: Jan-17-2025