Inorganic Tin Catalyst for Polyethylene Crosslinking
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Solution Overview
Problem
Conventional crosslinking agents for polyethylene in cable production, such as organic tin compounds, have negative environmental impacts and pose handling hazards, while offering limited crosslinking performance.
Innovation Solution
A crosslinkable polyethylene composition using inorganic tin as a silanol condensation catalyst without covalent bonds to carbon, combined with hydrolysable silane groups, specifically trimethoxy or triethoxy silane groups copolymerized directly onto the polymer backbone, to enhance crosslinking efficiency and reduce environmental and handling risks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If organic tin compounds are used as silanol condensation catalysts for crosslinking polyethylene, then crosslinking performance is achieved, but environmental impact increases and handling hazards occur
Solution Approach 1:
The patent changes the chemical composition parameter of the catalyst from organic tin compounds to inorganic tin compounds (specifically tin(II) compounds such as tin(II) oxide, tin(II) hydroxide, or tin(II) salts of carboxylic acids with 1-10 carbon atoms). This parameter change maintains the catalytic activity for silanol condensation and crosslinking performance while eliminating the environmental and handling hazards associated with organic tin compounds, thus resolving the technical contradiction between reliability and harmful factors.
2Reliability
If conventional crosslinking agents are used, then crosslinking is achieved, but mechanical strength and chemical resistance are limited
Solution Approach 1:
The patent employs a composite approach by combining inorganic tin catalysts with specific polyethylene-silane compositions. The use of tin(II) compounds as catalysts in conjunction with polyethylene containing hydrolyzable silane groups creates a composite system that achieves superior crosslinking. This composite material system enhances both mechanical strength and chemical resistance beyond what conventional crosslinking agents can achieve, while the inorganic nature of the catalyst provides additional environmental benefits.
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 achieves comparable or improved crosslinking results to organic tin-based systems while minimizing environmental impact and handling hazards, resulting in improved mechanical strength and chemical resistance for cable layers.
Implementation Method 1
crosslinking may be performed by condensation of silanol groups contained in the polyethylene which can be obtained by hydrolysation of silane groups
Implementation Method 2
crosslinking may be performed by condensation of silanol groups contained in the polyethylene
Implementation Method 3
a silanol condensation catalyst must be used... wherein the silanol condensation catalyst comprises an inorganic tin compound
Data Source
AI summary
A polyethylene composition comprising a polyethylene comprising hydrolysable silane groups and a silanol condensation catalyst that can be crosslinked. The crosslinkable polyethylene comprises trimethoxy silane and/ or triethoxy silane groups and the silanol condensation catalyst comprises an inorganic tin compound in which a tin atom has no covalent bond to a carbon atom. The crosslinked composition can be used in a cable, such as an insulation layer.