PVB Interlayer Compatibilizer for Haze Reduction
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Solution Overview
Problem
The recycling of multilayer polymer interlayers is challenging due to optical quality defects like haze and incompatibility issues between different resin types, which limits their recyclability and increases disposal costs in applications requiring high optical clarity.
Innovation Solution
A polymer composition comprising poly(vinyl butyral) resins with different residual hydroxyl contents, a plasticizer, and an anhydride compatibilizer, which improves compatibility and reduces haze to less than 5%, enabling the production of optically clear multilayer glass panels and enhancing recyclability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multilayer polymer interlayers with different resin types are used to achieve desired acoustic and mechanical properties, then acoustic insulation and mechanical strength are improved, but optical quality deteriorates due to haze and incompatibility issues
Solution Approach 1:
A compatibilizer is introduced as an intermediary substance between incompatible polymer resins (PVB and PVC) in the multilayer interlayer composition. The compatibilizer has molecular structures that are compatible with both resin types, enabling them to mix uniformly without phase separation. This resolves the optical quality deterioration caused by incompatibility while preserving the acoustic and mechanical benefits of using multiple resin types with different properties.
Solution Approach 2:
The invention creates a composite material system consisting of multiple polymer resins (PVB, PVC) combined with a compatibilizer and plasticizers. This composite approach allows the interlayer to simultaneously achieve desired acoustic insulation (through material selection and layering), mechanical strength (through reinforcement fibers and cross-linking), and optical clarity (through compatible mixing enabled by the compatibilizer), resolving the contradiction between functional performance and optical quality.
2Adaptability or versatility
If multilayer polymer interlayers with different resin types are recycled, then recyclability is improved, but optical quality deteriorates due to incompatibility and haze
Solution Approach 1:
The compatibilizer serves as a mediator that enables compatible mixing of different polymer resins during the recycling process. When recycled interlayer materials containing different resin types are reprocessed, the compatibilizer ensures uniform distribution and compatibility, preventing the formation of haze and maintaining optical quality. This makes recycling feasible while preserving product quality.
Solution Approach 2:
The invention facilitates the recovery and reuse of multilayer polymer interlayer materials that would otherwise be difficult to recycle due to incompatibility issues. By incorporating the compatibilizer, the system enables multiple resin types to be mixed and reprocessed into new interlayers with acceptable optical quality, thereby improving recyclability and reducing waste disposal needs.
3Manufacturing precision
If compatibilizer is added to achieve compatibility between different resin types, then optical clarity is improved, but device complexity increases
Solution Approach 1:
The invention manages composition complexity by optimizing the amount of compatibilizer used and selecting plasticizers with appropriate molecular weights and chemical structures that facilitate compatibility. By carefully controlling these parameters, the system achieves the desired optical clarity without excessive complexity in the formulation or processing requirements.
Data Source
AI summary
A polymer composition comprising a first poly(vinyl butyral) resin having a first residual hydroxyl content; a second poly(vinyl butyral) resin having a second residual hydroxyl content; a plasticizer; and at least one compatibilizer, such as an anhydride compatibilizer; wherein the difference between the first and second residual hydroxyl contents is at least 2 wt.%, and wherein the polymer composition has a percent haze of less than 5%. The use of a compatibilizer reduces or minimizes the optical defects, such as haze and color, without sacrificing other characteristics of the composition. The composition may be used in an interlayer.