Ultraviolet)/moisture/thermal triple curing organic silicone adhesive

Abstract

The invention discloses an ultraviolet) / moisture / thermal triple curing organic silicone adhesive which comprises the following components in parts by weight: 100 parts of (methyl) acroloyl-oxy alkyl urea alkoxy silicon terminated dimethyl siloxane, 0.5-5 parts of a photoinitiator, 0.5-5 parts of a moisture curing catalyst, 0.5-5 parts of a free radical photoinitiator and 1.0-40 parts of fumed silica. The organic silicone adhesive can be applied to adhesion or encapsulation, a part exposed in the air can be rapidly cured through ultraviolet rays, a shadow area or a lighttight part can be curedthrough moisture or heating, the production efficiency can be greatly improved, and the problem that organic silicon is long in curing time and low in curing efficiency in mere moisture curing or thermal curing can be avoided.

Description

technical field [0001] The invention belongs to the field of adhesive / sealant preparation, and in particular relates to a solvent-free silicone adhesive / sealant capable of triple curing by ultraviolet light / moisture / heat. Background technique [0002] Silicone materials have many excellent properties due to their unique molecular structure, such as high and low temperature resistance, weather resistance, low surface energy and chemical stability, etc. These properties make organosilicon materials more and more people's attention and widely used. [0003] UV curing technology has the characteristics of high efficiency, less pollution, simplicity, energy saving, etc. It is an environmentally friendly green technology. If a photosensitive group is introduced into the polyorganosiloxane molecular chain to make it a photocurable polysiloxane, the curing efficiency will be greatly improved. [0004] The combination of silicone materials and UV curing technology can not only prom...

AI Technical Summary

Problems solved by technology

[0006] Although the dual-cure system can solve the problem of non-curing in the shadow area, the UV / moisture dual-cure system still has problems such as long curing time in the shadow area

Especially in winter when the temperature is low and the humidity is low, for applications with deep curing thickness, it may not be fully cured for several days, which seriously affects the delivery cycle

The UV / heat dual curing system can avoid the risk of long curing time or no curing in moisture, and can be cured in a relatively short time at a certain temperature, but due to the influence of the inherent polymerization inhibition effect of oxygen in the radical polymerization system, the oxygen The permeability is higher, the dissolved oxygen capacity is stronger, and the surface curing performance is often worse than that of acrylic ultraviolet curing materials. In the early stage of curing, there is often a layer of sticky substance on the surface, which cannot be fully dry, and it is easy to absorb dust in the air. Can not be stacked together to avoid adhesion, affecting the smooth progress of the next process

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