Radiation curing sealant for packaging eyeglass nameplate or ornament

Abstract

The invention provides a radiation curing sealant for packaging an eyeglass nameplate or an ornament. The radiation curing sealant comprises the following components in percentage by weight: 30 to 70 percent of urethane acrylate low polymer, 10 to 50 percent of urethane acrylate, 0 to 40 percent of reactive diluent, 0.2 to 8 percent of photo-initiator, 0.1 to 5 percent of silane coupling agent, 0 to 2 percent of antioxidant and 0 to 2 percent of antifoaming agent, wherein the reactive diluent is mono (bi / multi)-functional group acrylic ester; the photo-initiator is a cracking initiator, a hydrogen abstraction initiator or the combination of the cracking initiator and the hydrogen abstraction initiator; and the silane coupling agent is a mixture selected from one or more of epoxy silane, vinyl silane and (methyl) propylene acyloxy silane. When the sealant is used, the sealant is directly injected into a groove for accommodating the eyeglass nameplate or the ornament without sealant mixing. The sealant can be cured rapidly under the irradiation of ultraviolet light and packaging is further finished, so that production efficiency is improved greatly; simultaneously, energy is saved and raw material cost is lowered.

Description

technical field [0001] The present invention relates to glasses nameplate and decoration encapsulation process, in particular, relates to the sealant used in the glasses nameplate and decoration encapsulation, particularly relates to a kind of glasses nameplate and decoration encapsulation radiation curing sealant. Background technique [0002] The processing technology of eyeglass nameplate and jewelry packaging is generally realized by die-casting molding. The main steps are: put the nameplate or jewelry and plastic raw materials into the cavity of the die-casting mold, and die-cast together with the substrate to form a hard substrate. The nameplate or ornament is encapsulated between the substrate and the plastic. The heating temperature of this process reaches 200°C, the pressurization pressure reaches 9-11 tons, and the pressurization time is more than ten minutes. The heating temperature of this process is high, which is easy to affect the quality of nameplates or acc...

AI Technical Summary

Problems solved by technology

At present, the sealing material used in this process is usually a two-component thermosetting epoxy glue, which cannot be cured at high temperature due to the high temperature resistance of plastic spectacle frames. Generally, it is lower than 60°C or directly at room temperature. Curing, the curing time is about 20 hours, so the production efficiency is extremely low, resulting in high production costs

Secondly, before using the two-component thermosetting epoxy adhesive, the two components must be mixed and stirred evenly, and the operation process is complicated, which brings inconvenience to the construction.

In addition, since the two components start to cure immediately at room temperature after mixing, the pot life is very short, that is, the time for the epoxy adhesive to be used after the components are mixed is very short