Curable Polyolefin Composition for Efficient Crosslinking Stability
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Solution Overview
Problem
Current crosslinking methods for low molecular weight polyolefins result in poor mechanical properties, thermal stability, and UV resistance due to high peroxide levels and residual backbone unsaturations, making it challenging to achieve efficient crosslinking with good mechanical properties and stability.
Innovation Solution
A curable composition comprising a polyolefin component with an unsaturated polyolefin and a telechelic polyolefin, combined with a cross-linking agent, which includes a hindered double bond to enhance crosslinking efficiency and stability, while minimizing unsaturations and peroxide requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If low molecular weight polyolefins are crosslinked using conventional methods, then crosslinking can be achieved, but mechanical properties and thermal stability deteriorate due to high peroxide levels and residual backbone unsaturations
Solution Approach 1:
The patent changes the chemical structure parameters of the polyolefin by introducing specific unsaturation types (vinyl, vinylidene, vinylene groups) at controlled positions in the molecular chain. This allows crosslinking to proceed with fewer residual unsaturations and lower peroxide requirements, improving thermal stability while maintaining mechanical properties
Solution Approach 2:
The invention creates a composite crosslinked structure by combining polyolefins with specific unsaturation patterns and crosslinking agents. This composite approach enables efficient crosslinking networks with reduced harmful residual unsaturations and improved overall material performance
2Productivity
If high molecular weight polyolefins are used for crosslinking, then efficient crosslinking is achieved, but mechanical properties worsen due to high molecular weight between crosslinks
Solution Approach 1:
The patent optimizes the molecular weight parameter by using low molecular weight polyolefins (1,000-100,000 g/mol) with specifically engineered unsaturation patterns. This enables efficient crosslinking while achieving appropriate molecular weight between crosslinks for good mechanical properties
3Ease of manufacture
If low molecular weight resins with high unsaturations are crosslinked, then crosslinking can proceed, but thermal and UV stability deteriorate due to crosslink network with low molecular weight between crosslinks
Solution Approach 1:
The patent changes the quality and position of unsaturations rather than just increasing quantity. By placing vinyl, vinylidene, or vinylene groups at specific positions in the molecular chain, the resin achieves good crosslinking processability while maintaining thermal and UV stability through reduced residual backbone unsaturation
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 solution provides improved mechanical properties, thermal stability, and UV resistance for low molecular weight polyolefins by optimizing the crosslinking process, leading to enhanced performance in temperature-sensitive applications.
Implementation Method 1
Crosslinking of elastomer resins is frequently used to produce articles with good thermomechanical properties
Implementation Method 2
the polyolefin component comprises an unsaturated polyolefin of the formula A1L1
Data Source
AI summary
The present disclosure relates to unsaturated polyolefins and processes for preparing the same. The present disclosure further relates to curable formulations comprising the unsaturated polyolefins that show improved crosslinking.