Reflective Coating Silicone Composition for Photovoltaic Modules
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Solution Overview
Problem
Current reflective coatings in photovoltaic battery assemblies face issues with slow curing times, high viscosity leading to application difficulties, and low bonding strength, which affects the efficiency and stability of solar energy utilization.
Innovation Solution
A silicone composition comprising a base polymer component, a catalyst, and a cross-linking agent, divided into components A and B, is used to form a reflective coating with improved bonding strength and reduced curing time, allowing for higher reflectivity and better solar energy utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If one-component condensation-type silicone adhesive is used for reflective coating, then the process is simple and curing can be done at room temperature, but the curing time is slow (24 hrs or more for 5 mm curing)
Solution Approach 1:
The silicone adhesive is divided into two separate components (Component A: silane-modified polymer and Component B: crosslinking agent with catalyst) that are mixed immediately before application. This segmentation allows each component to be optimized independently while enabling fast curing through controlled chemical reaction upon mixing, resolving the contradiction between process simplicity and curing speed.
Solution Approach 2:
The silane-modified polymer is pre-modified with silane groups during manufacturing, and the crosslinking agent is pre-prepared with catalyst. These preliminary preparations enable the crosslinking reaction to proceed rapidly upon mixing, achieving fast curing without requiring complex post-mixing processing or high temperatures.
2Ease of manufacture
If one-component condensation-type silicone adhesive is used, then the process is simple, but the viscosity is high making application difficult and uniformity poor
Solution Approach 1:
By separating the adhesive into two low-viscosity components that are mixed immediately before application, the system achieves both ease of application (low viscosity during application) and process simplicity (no special equipment needed). The segmentation allows each component to maintain optimal viscosity independently while the mixture provides the required bonding properties.
3Loss of time
If two-component silicone adhesive with fast curing rate is used, then the curing time is reduced, but the bonding strength is far below that of one-component condensation-type silicone adhesive causing delamination
Solution Approach 1:
The adhesive system combines silane-modified polymer (Component A) with crosslinking agent containing catalyst (Component B) to create a composite material that exhibits both fast curing and high bonding strength. The silane groups in Component A form strong crosslinked networks when reacted with Component B, producing a composite adhesive that overcomes the strength deficiency of conventional fast-curing two-component adhesives.
Solution Approach 2:
The invention changes the chemical parameters of the adhesive system by introducing silane-modified polymer with specific functional groups and controlling the crosslinking reaction conditions. This parameter change enables the adhesive to achieve both rapid curing (reduced curing time) and high bonding strength, resolving the contradiction between these two properties.
4Ease of manufacture
If one-component condensation-type silicone adhesive is used, then the process is simple, but small molecules are released during curing affecting coating performance
Solution Approach 1:
The invention changes the chemical reaction mechanism from condensation polymerization (which releases small molecules) to crosslinking reaction of silane groups (which does not release small molecules). This parameter change in the curing chemistry eliminates the harmful byproduct while maintaining the simplicity of the curing process, thereby improving coating performance and reliability.
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 silicone composition reduces curing time, increases adhesion force, and enhances solar energy utilization by enabling a high proportion of reflective material to be mixed, improving the performance and longevity of photovoltaic assemblies.
Implementation Method 1
a cross-linking agent and a catalyst, wherein the base polymer component, the cross-linking agent and the catalyst are not mixed simultaneously before use
Implementation Method 2
a catalyst, wherein the base polymer component, the cross-linking agent and the catalyst are not mixed simultaneously before use
Data Source
AI summary
A silicone composition, a reflective coating and a preparation method therefor, and a photovoltaic assembly comprising the reflective coating are disclosed. The silicone composition comprises a base polymer component, a catalyst, a cross-linking agent and reflective particles, wherein the base polymer component, the catalyst and the cross-linking agent are not mixed simultaneously before use; the base polymer component comprises 100 parts by weight of a polymethylsiloxane having at least two Si-Vi bonds per molecule, 5-15 parts by weight of a hydrogenated epoxy resin- or cycloaliphatic epoxy resin-modified polymethylvinylsiloxane terminated with a hydroxyl group, 10-20 parts by weight of a siloxane resin having at least two Si-Vi bonds; and the cross-linking agent is a polyorganosiloxane having at least two Si-H bonds.