Epoxy Adhesive Composition for Low-Temperature Perovskite Sealing
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Solution Overview
Problem
Conventional adhesive compositions for perovskite solar cells face challenges with low viscosity, curability at low temperature, high adhesiveness, and retention of power generation performance before and after sealing, which are essential for transparent film-type solar cells applied to buildings.
Innovation Solution
An adhesive composition comprising a reaction product of bifunctional and tri- or more functional epoxy resins with a saturated acid anhydride, a UV-sensitive reaction initiator, and a dilution solvent, with specific mole ratios and a reaction product with an alkoxysilane compound, achieving low viscosity, curability at low temperature, and high adhesiveness, while retaining power generation performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a conventional adhesive composition composed of an epoxy resin and a saturated hydrocarbon acid anhydride is used, then low viscosity and high transparency are achieved, but curability at low temperature is poor and power generation performance deteriorates
Solution Approach 1:
The patent modifies the chemical composition parameters of the adhesive system by introducing a carboxylic acid group-containing compound with specific molecular weight range (500-5000) and controlling the molar ratio of carboxylic acid groups to epoxy groups (0.95-1.05). This parameter optimization enables the adhesive to cure at low temperatures (60-120°C) while maintaining complete curing and power generation performance, resolving the contradiction between low curing temperature and performance retainability.
Solution Approach 2:
The patent creates a composite adhesive system combining epoxy resin, saturated hydrocarbon acid anhydride, and carboxylic acid group-containing compound. This composite formulation leverages the low viscosity and transparency of the epoxy-anhydride system while the carboxylic acid compound provides low-temperature curability and complete reaction, achieving both low curing temperature and high reliability simultaneously.
2Ease of operation
If the adhesive composition is designed for low viscosity and high transparency, then ease of operation is improved, but curability at low temperature deteriorates
Solution Approach 1:
The patent selects carboxylic acid group-containing compounds with specific molecular weight (500-5000) and controls the carboxylic acid to epoxy molar ratio (0.95-1.05), which maintains low viscosity for ease of application while enabling low-temperature curability. The molecular weight range ensures the adhesive remains fluid enough for operation but reactive enough to cure at low temperatures.
3Reliability
If the adhesive composition uses simple epoxy resin and saturated hydrocarbon acid anhydride, then manufacturing precision is maintained, but curability at low temperature and adhesiveness deteriorate
Solution Approach 1:
The patent introduces a carboxylic acid group-containing compound with controlled molecular weight (500-5000) and optimizes the carboxylic acid to epoxy molar ratio (0.95-1.05). This parameter control ensures complete curing reaction at low temperatures while maintaining strong adhesiveness, resolving the contradiction between low curing temperature and high adhesiveness.
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 ensures high adhesiveness and curability at low temperatures, maintaining power generation performance of perovskite solar cells before and after sealing, suitable for use in various fields including paint, electric, automobile, and building materials.
Implementation Method 1
a UV-sensitive reaction initiator (B)
Implementation Method 2
a reaction product represented by the following general formula (5) in which the compound represented by the general formula (1) is reacted with an alkoxysilane compound represented by the following general formula (6) or a partially hydrolyzed product thereof
Data Source
AI summary
An adhesive composition, including: a reaction product (A) among a bifunctional epoxy resin represented by the formula (2), a tri- or more functional epoxy resin represented by the formula (3), and a saturated acid anhydride represented by the following general formula (4); a UV-sensitive reaction initiator (B); and a dilution solvent (C), wherein the component (A) is a compound represented by the formula (1), a ratio of a total mole of epoxy groups in the multi-functional epoxy resin to a mole of the saturated acid anhydride is 1.30 to 3.00, and a mole of the bifunctional epoxy resin relative to a total mole of the multi-functional epoxy resin is 0.001 to 0.15. This provides a highly reliable epoxy-resin-based adhesive composition and film-shaped sealing material having a low viscosity, curability at low temperature, and high adhesiveness, and retaining power generation performance of a perovskite solar cell before and after sealing.