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Curing Process of Adhesive

Apr 27,2020 | Views: 264

Curing methods of adhesives are cured by physical methods, such as solvent evaporation, emulsion condensation and melt cooling and chemical methods.

(1) Hot melt adhesive: polymer melt can solidify by cooling after it soaks into the surface.

(2) Solution adhesive: with the volatilization of the solvent and the increasing concentration of the solution, it gradually reaches a certain strength of curing.

(3) emulsion adhesive: as the water in the emulsion gradually penetrates into the porous sticky substance and evaporates, the concentration of the emulsion increases continuously. Finally, due to the effect of surface tension, the polymer colloid particles coagulate. When the ambient temperature is high, the emulsion is condensed into a continuous adhesive film, while the ambient temperature is low and the minimum film forming temperature (MFT) forms a white discontinuous film. Emulsion adhesives are mainly copolymers of polyvinyl acetate and its copolymer and acrylate.

(4) polyfunctional monomers or prepolymers of thermosetting adhesives of thermosetting adhesives are polymerized. With the increase of molecular weight, molecular chain changes and crosslinks are formed at the same time, forming insoluble or melted gelation or basic curing. In a certain range, prolonging curing time is not equivalent to increasing curing temperature, and reducing curing temperature is difficult to compensate with prolonging time. Because there is a certain chemical reaction between the adhesive and the surface of the object to be adhered, it is necessary to have an enough high temperature.

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