HALS Stabilizer Mixture for Plastic Storage Stability
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Solution Overview
Problem
Current light stabilizers for organic materials, such as plastics and paints, face limitations in storage and transport properties, leading to issues like caking and reduced effectiveness over time.
Innovation Solution
A mixture of oligomeric and low-molecular-weight HALS compounds with specific molecular weight ranges and structural compositions is developed, which exhibits synergistic stabilizing action and improved storage properties, eliminating the need for diluents and enhancing stability against light, oxygen, and heat.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If single-component HALS stabilizers are used, then stabilization effectiveness is achieved, but storage and transport properties deteriorate (caking occurs)
Solution Approach 1:
The patent combines oligomeric HALS compounds (average molecular weight 1000-50,000) with low-molecular-weight HALS compounds (molecular weight 200-1000) to create a synergistic mixture. This merging of different molecular weight components resolves the contradiction by providing both stabilization effectiveness and improved storage stability, eliminating caking while maintaining protective function.
Solution Approach 2:
The invention creates a composite stabilizer system comprising multiple HALS compounds with different molecular weights and structures. The composite nature of this mixture provides both the required stabilization effectiveness and improved storage/transport properties, as the different components complement each other's shortcomings.
2Reliability
If high molecular weight HALS compounds are used, then stabilization performance is improved, but storage and transport handling deteriorates
Solution Approach 1:
The patent segments the HALS stabilizer system into two distinct molecular weight fractions: oligomeric compounds (1000-50,000) and low-molecular-weight compounds (200-1000). This segmentation allows each component to contribute its specific advantages, with the low-molecular-weight portion improving handling while the oligomeric portion providing enhanced stabilization performance.
Solution Approach 2:
The invention changes the molecular weight parameter distribution by incorporating compounds across a broad range (200-50,000) rather than using a single molecular weight. This parameter change enables simultaneous achievement of good storage/transport handling and high stabilization performance through the synergistic effect of different molecular weight components.
3Reliability
If conventional HALS stabilizers are used, then light stabilization is achieved, but concentration requirements are high
Solution Approach 1:
The patent merges oligomeric and low-molecular-weight HALS compounds in a synergistic mixture that achieves light stabilization at lower total concentrations compared to single-component systems. The combination provides enhanced stabilization effectiveness while reducing the quantity of stabilizer material needed.
Solution Approach 2:
The composite mixture of different HALS compounds provides superior light stabilization performance at lower concentrations than individual components. The synergistic interaction between components of different molecular weights enhances the overall stabilization efficiency, reducing the quantity of stabilizer required.
Data Source
AI summary
Suitable stabilizers for organic material are a mixture comprisingA. at least one oligomeric compound, comprising repeat units of the formula (I),in which the meanings of the symbols are as follows:R1 is hydrogen, C1-C6-alkyl, formyl, C2-C6-alkanoyl, C1-C12-alkoxy, C5-C6-cycloalkoxy, cyanomethyl, 2-hydroxyethyl, benzyl or a radical of the formula —CR′═CH—CO—OR″, whereR′ is hydrogen, C1-C6-alkyl or a radical of the formula —CO—OR″, andR″ is C1-C18-alkyl, C5-C8-cycloalkyl, C7-C18-aralkyl, phenyl, or tolyl;R2 is a mixture composed of C14-C28-alkyl groups, where two of these alkyl groups whose number of carbon atoms is not permitted to differ by more than two respectively make up at least 30% of this mixture;R3 and R4, independently of one another, are C1-C6-alkyl; andB. at least one compound of the formula (II) or (III)where the meanings of the symbols and indices are as follows:n and m, independently of one another, are a natural number from 2 to 22,andR1, R3 and R4, independently of one another, have the meanings given in formula (I).