Moisture-Curable Adhesive for Optical Fibers
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Solution Overview
Problem
Adhesive compositions for optical fibers face challenges in maintaining bond strength under high humidity and temperature conditions, as existing polysiloxane-based adhesives are prone to moisture infiltration, leading to reduced durability.
Innovation Solution
Development of a moisture-curable adhesive composition incorporating reactive silicon-containing group-bearing compounds, such as those formed by reacting epoxy compounds with silane coupling agents, which provide excellent adhesive properties and resistance to moist heat.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If polysiloxane-based adhesive composition is used, then heat resistance is improved, but moisture infiltration occurs leading to reduced bond strength
Solution Approach 1:
The patent changes the chemical composition parameters by introducing reactive silicon-containing groups (such as alkoxy, alkyl, or aryl groups) that can react with moisture to form crosslinked structures. This parameter change enables the adhesive to cure in high-humidity environments while maintaining bond strength, resolving the contradiction between heat resistance and moisture resistance.
Solution Approach 2:
The patent creates a composite adhesive system combining polysiloxane base resin with reactive silicon-containing compounds and crosslinking agents. This composite structure provides both the heat resistance of polysiloxane and the moisture-curing capability of silicon-containing groups, achieving superior performance in harsh environments.
2Strength
If epoxy-based adhesive is used, then adhesive strength is improved, but health problems occur and heating is required
Solution Approach 1:
The patent replaces traditional epoxy adhesives with a silicon-based adhesive system that cures at lower temperatures and eliminates the need for heating equipment. The reactive silicon-containing groups provide sufficient crosslinking density to achieve strong bonds without requiring the harsh curing conditions needed for epoxy, thereby eliminating health hazards and simplifying application.
Solution Approach 2:
The patent substitutes the thermal curing mechanism of epoxy adhesives with a moisture-curing mechanism based on hydrolysis and condensation of silicon-containing groups. This chemical mechanism replacement eliminates the need for heating equipment and reduces health hazards associated with high-temperature curing, while maintaining adhesive strength.
3Adaptability or versatility
If adhesive composition is used for outdoor installation, then versatility is improved, but durability in harsh environment deteriorates
Solution Approach 1:
The adhesive composition is designed to be self-curing through moisture from the environment. The reactive silicon-containing groups automatically react with ambient moisture to form crosslinked structures, eliminating the need for external heating or catalysts. This self-service curing mechanism ensures consistent performance in outdoor environments while maintaining durability in harsh conditions.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The adhesive composition exhibits improved shear strength and durability even in harsh environments, maintaining bond integrity under high humidity and temperature conditions.
Implementation Method 1
moisture-curable adhesive composition incorporating reactive silicon-containing group-bearing compounds
Implementation Method 2
reactive silicon-containing group-bearing compound having a molecular weight per reactive silicon-containing group thereon of 1,000 or less
Implementation Method 3
reactive silicon-containing group-bearing compound (A) which includes a compound (c) formed by reacting an epoxy compound (a) having at least one epoxy group with a silane coupling agent (b)
Data Source
AI summary
To provide adhesive compositions for optical fibers which are curable with moisture and excellent in adhesiveness and resistance to moist heat.An Adhesive composition for optical fibers containing (A) a component having a reactive silicon containing group which contains (e) a compound obtained by reacting (a) an epoxy compound having at least one epoxy group with (b) a silane coupling agent having both a reactive silicon containing group and an epoxy-reactive group, wherein the component (A) has a molecular weight of 1000 or below per reactive silicon containing group; and an adhesive composition for optical fibers containing an alkylsilyl ester and (B) a compound other than the alkylsilyl ester which has at least one reactive silicon containing group.