Classification of high temperature resistant adhesives

Glue is a commonly used material for repair in life, but for some special materials, such as metal, ceramic, cement or glass, the requirement for glue is not only good adhesion but also high temperature resistance. Adhesive is a substance that can bind the adherends together through adhesion. Adhesive is a common standard term and also includes glue, cement, glue, paste, and so on.
1. High temperature resistant adhesives are classified by main chemical composition or base material
According to the main chemical composition or base material of the adhesive, the adhesive can be divided into two categories: inorganic adhesive and organic adhesive.

2. Classification by apparent physical form
According to the appearance of adhesives on the market, people often divide adhesives into the following four types.

(1) Solvent type. Synthetic resin or rubber is formulated into a solution of a certain viscosity in a suitable solvent. All synthetic resins are mainly two types of thermoset and thermoplastic, so rubber includes natural rubber and synthetic rubber.

(2) Emulsion type. Synthetic resin and rubber are dispersed in water to form aqueous solutions and emulsions

(3) Paste or paste type. This is a kind of volatile and high viscosity adhesive that is made of synthetic resin and rubber. It is mainly used for sealing and caulking.

(4) Solid type. Generally, the thermoplastic synthetic resin or rubber is made into a granular, block or ribbon shape, which can be applied after heating and melting, and then solidifies after cooling, which is also called hot melt adhesive film type. The adhesive is coated on various substrates (paper, cloth, glass, etc.) as a film-like tape, or made of synthetic resin or rubber directly into a film, the latter often has occasions requiring higher adhesive strength.

3. Classified by curing method
Adhesives generally require curing during the bonding process, and are generally divided into the following five types according to their curing methods.

(1) Water-based evaporation type. Such as polyvinyl alcohol aqueous solution and ethylene-ethyl acetate copolymer emulsion adhesive.

(2) Solvent volatile type. Such as neoprene adhesive.

(3) Hot melt type. Such as granular, rod-shaped, ribbon-ethyl acetate hot-melt adhesive.

(4) Chemical reaction type. Such as a-cyanoacrylate instant glue, acrylic double-fat anaerobic glue, butadiene rubber, etc.

(5) Pressure-sensitive type. Adhesive that can be bonded and not cured under pressure, commonly known as self-adhesive.

4. Classified by force
Adhesives can generally be divided into two types: structural adhesives and non-structural adhesives.

(1) Structural adhesive. This type of adhesive can transmit large stresses and can be bonded by structural parts. This kind of adhesive is usually made of thermosetting resin. Epoxy resin or modified epoxy resin, phenolic resin or modified phenolic resin are usually used as the main components.


(2) Non-structural adhesive. This type of adhesive can not transmit large stress, and is often used in hot-melt resins, synthetic rubber as the main component, such as the silicone rubber adhesive used in the electronics industry.

5. Classification by use
Adhesives are mainly classified into metal, plastic, fabric, paper, medical, footwear, woodworking, construction, automobile, aircraft, electronic components and other special adhesives, as well as special functional adhesives, such as conductive adhesives, magnetic conductive adhesives, and high temperature resistant , Semiconductor glue, medical glue, etc.