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                                                 What is the difference between UV shadowless glue and PUR hot melt glue

The use of hot melt adhesive and UV shadowless glue is relatively large. The composition and curing principle of these two glues are different. So what are the UV shadowless glue and PUR hot melt glue? What is the difference?

PUR hot melt adhesive is a kind of moisture-responsive adhesive. It is a kind of temperature-resistant glue that absorbs moisture in the air and reacts chemically to achieve bonding through some molecules in the glue. Shadowless glue, also known as UV glue, is a photosensitive glue that can be cured after being irradiated with ultraviolet light to the glue, that is, the photosensitizer in the UV glue will trigger a series of reactions after being irradiated by ultraviolet rays. The glue layer after glue is not irradiated with UV lamp, and the UV glue is almost impossible to cure.

UV shadowless glue glue is generally applied by a three-axis glue dispenser or a UV glue dispenser. After glue is applied, the glued product is placed under a UV lamp for a certain period of time, so that the photoinitiator in the UV glue is exposed to ultraviolet rays. Activated free radicals are generated under irradiation, and the free radicals and monomers undergo a series of reactions to form polymers with good bonding properties, thus realizing the bonding of electronic products.

PUR hot-melt glue is heated and melted into liquid glue by using a hot-melt glue dispenser. , the cured adhesive layer will not melt when heated again, so it ensures good temperature resistance, and then realizes the high and low temperature resistance requirements of the product, ensuring good dustproof, waterproof and sealing performance of the product.