Stabilizer Mixture for Olefin Polymers Preventing Discoloration
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Solution Overview
Problem
Olefin-based polymers are susceptible to oxidative degradation caused by heat, light, and oxygen, leading to discoloration and reduced mechanical properties, and existing antioxidants and anti-acid agents can cause coloration and processing instability.
Innovation Solution
A stabilizer mixture comprising organic phosphorus-containing antioxidants and sulfur-containing carboxylate salts is used to modify olefin-based polymers, enhancing their thermal resistance and processing stability while preventing discoloration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If antioxidants are used to prevent oxidative degradation, then mechanical property and thermal resistance are improved, but coloration and reduced processing stability occur
Solution Approach 1:
The patent combines multiple stabilizer components (antioxidants, acid acceptors, and other additives) into a composite stabilizer package. This composite approach allows the system to provide comprehensive protection against oxidative degradation while the synergistic interactions between components minimize coloration and maintain processing stability, resolving the contradiction between improved reliability and reduced harmful effects.
2Reliability
If anti-acid agents are used to inhibit degradation by acidic substances, then mechanical property is improved, but coloration and reduced processing stability occur
Solution Approach 1:
The patent integrates anti-acid agents with antioxidants and other stabilizers in a composite formulation. This composite structure allows the anti-acid agent to protect against acid-catalyzed degradation while the accompanying antioxidants prevent coloration and the synergistic interactions maintain processing stability, thus improving reliability without introducing harmful coloration effects.
3Reliability
If stabilizers are used to prevent oxidative degradation, then processing stability is improved, but multiple processing cycles cause cumulative discoloration
Solution Approach 1:
The patent employs a stabilizer package designed to provide cumulative protection through multiple processing cycles. The combination of antioxidants, acid acceptors, and other stabilizers creates a buffer system that progressively counteracts degradation mechanisms, preventing cumulative discoloration while maintaining processing stability across repeated extrusion and molding operations.
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 stabilizer mixture effectively prevents oxidative degradation, maintaining the mechanical properties and color stability of olefin-based polymers, even after multiple processing cycles, as demonstrated by reduced yellowness and melt index variations.
Implementation Method 1
olefin-based polymers have defects, such as susceptibility to discoloration (for example, yellowing) and reduced mechanical properties, due to oxidative degradation caused by heat, light, and oxygen
Implementation Method 2
an anti-acid agent may be used in a process for manufacturing a molding product from an olefin-based polymer to inhibit the degradation of the olefin-based polymer by an acidic substance
Data Source
AI summary
Disclosed herein is a stabilizer mixture for modifying an olefin-based polymer, which comprises at least one organic phosphorus-containing antioxidant represented by a formula selected from the group consisting of formulae (1), (2), (3), (4), (5), (6), (7), and (8), as well as at least one sulfur-containing carboxylate salt represented by a formula selected from the group consisting of formulae (9), (10), (11), and (12). Also disclosed herein is a modified polymer composition prepared from an olefin-based polymer using the stabilizer mixture. The olefin-based polymer is selected from the group consisting of polyolefin, ethylene-vinyl acetate copolymer, and a combination thereof.