UV-LED and moisture dual-curable environment-friendly three-proofing adhesive and preparation method thereof

Abstract

The invention discloses a UV-LED and moisture dual-curable environment-friendly three-proofing adhesive and a preparation method thereof, and relates to the field of adhesives. The UV-LED and moisturedual-curable environment-friendly three-proofing adhesive is prepared from the following raw materials in parts by weight: 40-60% of self-made UV-moisture dual-curable acrylate, 10-25% of self-made low-viscosity tetrafunctional acrylate, 30-50% of an acrylic reactive diluent, 3-8% of a photoinitiator, 0.05-0.2% of a polymerization inhibitor and 1-3% of a silane coupling agent. 365nm UV-LED equipment curable three-proofing adhesive is used, the spraying process is met, the leveling effect is good, most importantly, the oxygen inhibition problem of traditional three-proofing adhesive cured by UV-LED is solved, the cured three-proofing adhesive is smooth in surface drying, not sticky to hands, good in toughness and 5B in adhesive force, and can be cured through moisture crosslinking in an area which is difficult to irradiate by ultraviolet light. Therefore, the protection effect on various complex types of circuit boards is realized.

Description

technical field [0001] The invention relates to the field of adhesives, in particular to an environmentally friendly three-proof adhesive with double curing of UV-LED and moisture and a preparation method thereof. Background technique [0002] As we all know, as electronic products gradually turn to miniaturization, integration, and multi-function, the electronic assembly industry is also developing at a high speed, and the requirements for the safety and reliability of assembled products are also getting higher and higher, especially for printed circuit boards. As electronic devices are more and more widely used in daily life, consumers are now paying more and more attention to the quality and reliability of products. Mentioned and valued by the manufacturer. [0003] Although UV-cured solvent-free environmentally friendly "three-proof glue" has appeared on the market, due to the large spraying area of ​​the three-proof glue and the low thickness of the spray (the common t...

AI Technical Summary

Problems solved by technology

However, the current UV-LED curing products on the market have obvious oxygen inhibition effect, that is, the surface of UV-LED curing is sticky.

Whether UV-LED is 365nm, 395nm or others, it basically has a single-wavelength emission spectrum, while traditional mercury lamps have different spectral ranges due to different additives, but no matter which type is full-wavelength emission spectrum, so in the same Under the irradiation conditions, the free radical active groups produced by the photoinitiator under UV-LED single-wavelength irradiation are significantly less, and the oxygen on the surface of the glue will compete with the polymerization reaction of free radicals to consume the active free radicals produced by the initiator when the glue is curing. , the so-called "oxygen inhibition" phenomenon appears, which eventually leads to obvious sticky surface after the glue is cured, which is easy to stick a lot of dust, and causes a lot of inconvenience in the process of operation

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