A polyurethane hot-melt adhesive humidifying agent and a film-attaching method using the humidifying agent

Abstract

The invention provides a moisture reactive PUR (polyurethane resin) hot melt adhesive wetting agent and a preparation method thereof and a PUR film sticking method using the moisture reactive PUR (polyurethane resin) hot melt adhesive wetting agent. The moisture reactive PUR (polyurethane resin) hot melt adhesive wetting agent comprises softening water, a wetting agent and a powdery adsorbent, the softening water is a basic component, and 0.05-0.5 liter of the wetting agent and 0.1-1 kg of the powdery adsorbent are added into every 100 liters of the softening water. The PUR film sticking method is as follows: a certain amount of moisture reactive PUR (polyurethane resin) hot melt adhesive wetting agent with affinity water molecules is forcibly replenished into a dry basic material, the hot melt adhesive wetting agent can be uniformly sufficiently blended into an adhesive film in a short period of time so as to promote initiation of crosslinking curing reaction of the sticky adhesive film as soon as possible, self solidification phenomenon of the PUR hot melt adhesive film is reduced, cross-linking reaction time is reduced, product processing cycle is shortened, bonding strength is ensured, and product quality is improved.

Description

technical field [0001] The present invention relates to a polyurethane (PUR) hot melt adhesive humidifying agent and a film sticking method using the humidifying agent, in particular to a moisture-responsive PUR hot-melt adhesive humidifying agent and the use of the moisture-reactive PUR hot-melt adhesive to humidify Agent PUR film method. Background technique [0002] At present, the moisture-responsive polyurethane hot-melt adhesive is the first choice in the film-sticking process of interior decoration materials as the adhesive for plastic films, that is, a moisture-responsive PUR hot-melt adhesive. This hot-melt adhesive does not need to add any solvents during use. And polar strong oxidation initiator, with high initial bond strength, safe and non-toxic, easy to operate and so on. [0003] The gluing reaction mechanism of the moisture-responsive PUR hot-melt adhesive is as follows: the NCO functional group at the end of the molecular chain of the hot-melt adhesive reac...

AI Technical Summary

Problems solved by technology

Once the humidity or temperature fluctuates greatly during the reaction process, the cross-linking reaction will slow down, the cross-linking reaction will fail, the bonding strength will be greatly reduced, and the film will fall off.

[0005] Due to the vast territory of our country, the climate in the north is dry, the humidity is extremely low, and the ambient temperature and day and night changes greatly in the four seasons. Under such unfavorable climatic conditions, the application of moisture-responsive PUR hot-melt adhesives is greatly restricted. In the actual production environment, the continuous temperature can be maintained by compulsory means, but the persistent humidity is difficult to be guaranteed by control measures, which is very unfavorable for the application of moisture-responsive PUR hot melt adhesives in decorative materials. Impact

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