A kind of UV/moisture dual fast curing polysiloxane adhesive composition

Abstract

The invention relates to a polysiloxane adhesive composition with UV / moisture double fast curing, which comprises: (A) 100 parts by weight of diorganopolysiloxane, (B) 5-100 parts by weight of organic modified (C) 0.5-5 parts by weight photoinitiator, (D) 0.001-2 parts by weight organometallic catalyst. The invention has the characteristics of fast ultraviolet curing rate, short moisture curing time, low VOC, high transparency, excellent bonding performance and long storage period. The adhesive composition involved in the invention can be applied to display screens, touch screens and optical devices, circuit board protection, chip protection, and motor sealing.

Description

technical field [0001] The invention relates to the fields of sealing materials and optical adhesives, in particular to a polysiloxane adhesive composition with ultraviolet / moisture double rapid curing and a preparation method thereof. Background technique [0002] Due to the large number of repeated siloxane chains, silicone materials have excellent weather resistance, excellent resistance to alternating cold and heat, excellent electrical insulation, low surface energy, good shock resistance, chemical stability, etc. Performance, widely used in industrial fields, such as sealing of structural components, bonding of optical components, bonding and sealing protection of electrical and electronic components, etc. [0003] At present, the most widely used one-component room temperature curing silicone material. It relies on hydrolyzable groups to react and solidify at room temperature under the action of catalysts such as organic titanium, zirconium, and tin compounds, which ...

AI Technical Summary

Problems solved by technology

Although the Si-O chains of polysiloxanes have good thermal stability and low curing shrinkage compared with C-C links, the dark reaction of Michael addition of thiols to alkenyls is usually difficult to suppress, which greatly affects the combination The storage stability of the product, and the molecular chain growth of the mercapto-ene addition system is slower than that of the free radical polymerization, which requires more radiation energy and curing time

Although the deoximation type group has a faster moisture curing ability, the small molecular compound of oxime produced has the environmental risk of carcinogenesis

CN102532434B discloses a UV-moisture dual curing dealcoholized silicone adhesive composition based on a free radical reaction, wherein the acrylate-modified polysiloxane and the reactive diluent monomer provide the function of UV curing alone, and the introduced Replacing trimethylsiloxane coupling agent as dealcohol-type crosslinking agent to endow the function of moisture curing, however, the UV curing group and the moisture curing group are not on the same polysiloxane molecular chain, which will reduce the effect of pure UV or moisture curing. Mechanical Properties of Silicone Rubber Under Moisture Curing Conditions

At the same time, the dealcoholized group has low hydrolysis activity, and it is difficult to obtain a faster moisture curing rate. The hydroxyl groups contained in small molecules such as methanol and ethanol released by partial hydrolysis will seriously affect the storage stability.

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