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What is hot melt adhesive aging?

2022-05-23    Views: 1

The aging of hot melt adhesive is quite common in its application. This phenomenon is mainly caused by the glue heating time being too long or the heating temperature being too high. How to determine if hot melt adhesive has aged?

Aging hot melt adhesive may exhibit the following phenomena:

1、 Glue discoloration;
2、 There are black carbides in the adhesive;
3、 Performance degradation (temperature resistance, viscosity decrease);
4. Changes in viscosity (thickening or thinning);
5、 Melting point decrease;

The aging phenomenon that occurs is generally caused by improper use of hot melt adhesive. It can also be stored for a long time before use. The surface of hot melt adhesive begins to oxidize, attaching dust and microorganisms. As long as the storage space is dry, tidy, and used properly, hot melt adhesive can be stored better, and there is no need to worry about its good storage performance.

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