Adhesives are substances that can tightly bond various materials together. Adhesives are also called adhesives, bonding agents and adhesives, referred to as glues. .
Adhesives and bonding technology are produced and developed along with human civilization. It is not only widely used in light textile industries such as plywood, paper processing, shoemaking, and fiber processing. It also promotes the development of industries such as construction, machinery, aviation and shipbuilding, and in biomedicine. Cutting-edge technology sectors such as electronic instrumentation, national defense industry and space technology also play an important role. With the continuous increase of new varieties of adhesives, the expanding scope of applications and the gradual in-depth discussion of anti-correlation theory, bonding technology will have broader development prospects. Kain will introduce various types of adhesives one by one here. Especially the categories and development trends of new adhesives.
Composition of adhesive
The natural adhesives used by people in the early days, such as animal isinglass, bone glue, plant starch, dextrin, etc. Water is used as the solvent and the components are very simple. However, when people use synthetic polymer compounds in large quantities, in order to meet various requirements, adhesives are mostly composed of a variety of components. These components are introduced below:
(1) Sticky material, also called base material, is the basic component of adhesives. It has a decisive influence on the bonding performance of the adhesive (such as bonding strength, joint heat resistance, aging resistance, etc.).
(2) Curing agent is also called hardener, curing agent or stabilizer. Curing agent is an additive that can cross-link polymers with linear structures to form structures. It is a good choice for certain types of adhesives (such as commonly used epoxy resin adhesives and room temperature curing phenolic resin adhesives, etc.) The dosage and performance of the curing agent, an essential component, will directly affect the process performance of the adhesive (such as the glue application method, curing conditions, etc.), and will also affect the performance of the bonded joint (such as bonding strength, durability, etc.). Thermal resistance, solvent resistance, etc.).
(3) Toughening agent Toughening agent can improve the performance of the adhesive, increase toughness, reduce brittleness, and improve the peeling and impact resistance of the adhesive joint structure force. Different tougheners are used according to different types of adhesives. Toughening agent and binder must have good compatibility.
(4) Diluent Diluent is a type of component that can reduce the viscosity of an adhesive. It can increase the actual infiltration of the adhesive onto the surface of the adherend ability and is conducive to construction. Any solvent that is miscible with the adhesive or various low-viscosity compounds that can participate in the curing reaction of the adhesive can be used as a diluent.
(5) Fillers Fillers can improve the bonding strength of bonded joints, increase surface hardness, improve heat resistance, reduce thermal expansion coefficient and shrinkage, increase viscosity and Cost reduction and other effects. Using special fillers, special properties can also be obtained, such as electrical conductivity, magnetic permeability, etc.
微信扫一扫打赏
