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What is the reason why the adhesive layer of the composite packaging roll film does not dry?

What is the reason why the adhesive layer of the composite packaging roll film does not dry? The main reason why the adhesive layer of the composite packaging roll film is not dry is that the main agent and the curing cross-linking reaction are incomplete, that is, some agents do not react with the curing agent, because the main agent is viscous. Only by reacting with the isocyanide in the curing agent to generate a network-like cross-linked structure, the polyurethane adhesive main agent has a high peel strength. However, the isoamino group in the curing agent of polyurethane adhesive is very easy to react with substances containing hydroxyl and amino groups (moisture, alcohols, amines), but it is 10-20 times faster than the reaction speed of the main agent and the curing agent. . In the actual compounding, the water and alcohol in the solvent will be volatilized in the drying tunnel, so what we need to do is to let the moisture and alcohol volatilize as much as possible in the drying tunnel, so as to reduce the problem of non-drying phenomenon. Appear. More bags: www.yltpacking.com Customized bags

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