Crosslinked TPU Wire Sheath for Heat Resistance and Air Tightness
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Thermoplastic polyurethane (TPU) used as a sheath material for wires and cables faces challenges in achieving high heat resistance and air tightness when used alone, particularly at the connection points with resin molded bodies, and there is a need for a material that does not release harmful halogen gases when burned.
Innovation Solution
A crosslinked resin composition is developed, comprising 0.01 to 20 parts by mass of a vinyl monomer with functional groups such as acid anhydride, silane, or epoxy, combined with TPU, and crosslinked using electron beam irradiation, optionally including triazine-based or phosphorus-based flame retardants, to enhance heat resistance and air tightness, while avoiding halogen-based materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If TPU is used alone as sheath material, then mechanical strength and flexibility are maintained, but air tightness to resin molded body deteriorates
Solution Approach 1:
The patent uses a composite material system combining TPU with vinyl monomers containing functional groups (acid anhydride, silane, amine, or epoxy). This composite approach allows the TPU base to provide mechanical flexibility while the vinyl monomer additives enable crosslinking reactions that improve air tightness to the resin molded body, resolving the contradiction between these two properties.
Solution Approach 2:
The patent changes the chemical parameters of the TPU by introducing vinyl monomers with specific functional groups and controlling their content (0.01-20 parts by mass per 100 parts TPU). This parameter modification enables the material to achieve both good air tightness through crosslinking and maintain mechanical flexibility, as demonstrated by the controlled composition ranges in the invention.
2Temperature
If TPU is crosslinked to improve heat resistance, then heat resistance is enhanced, but air tightness to resin molded body deteriorates
Solution Approach 1:
The patent changes the chemical composition parameters by selecting specific vinyl monomers with functional groups that provide both heat resistance through crosslinking and air tightness through adhesion promotion. The controlled content range (0.01-20 parts by mass per 100 parts TPU) optimizes both heat resistance and air tightness simultaneously.
Solution Approach 2:
The patent creates a composite crosslinked structure where TPU provides the base matrix for heat resistance while vinyl monomers with functional groups (acid anhydride, silane, amine, or epoxy) provide crosslinking points that also enhance adhesion to the resin molded body, thereby achieving both heat resistance and air tightness.
3Object-affected harmful factors
If halogen-based materials are used to improve flame retardancy, then flame resistance is enhanced, but harmful gas generation increases
Solution Approach 1:
The patent converts the potential harm of halogen-based flame retardants by replacing them with halogen-free alternatives that achieve comparable or superior flame resistance without generating harmful gases. The vinyl monomer crosslinking system provides inherent flame retardancy while avoiding toxic emissions, transforming the flame safety requirement into a benefit without the harmful side effects.
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 crosslinked resin composition achieves high heat resistance and improved air tightness at connection points, meeting the requirements for applications like anti-lock braking systems, and ensures that no harmful halogen gases are released during burning.
Implementation Method 1
the resin composition is crosslinked by an electron beam irradiation
Implementation Method 2
a crosslinked resin composition comprises: a resin composition comprising not less than 0.01 parts by mass and not more than 20 parts by mass of a vinyl monomer relative to 100 parts by mass of a thermoplastic polyurethane
Data Source
AI summary
A crosslinked resin composition includes a resin composition including not less than 0.01 parts by mass and not more than 20 parts by mass of a vinyl monomer relative to 100 parts by mass of a thermoplastic polyurethane, the vinyl monomer having a molecular structure including at least one functional group of acid anhydride, silane, amine and epoxy. The resin composition is crosslinked by an electron beam irradiation.