Polyurethane Cleaning Member for Stable High-Temperature Wiping
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Solution Overview
Problem
The wiping performance of cleaning members made from polyurethane elastomers deteriorates at high temperatures, leading to impaired cleaning efficiency over time, especially in high-temperature environments.
Innovation Solution
A polyurethane elastomer composition with a bifunctional silicone oil and aromatic isocyanate, optimized to maintain a specific viscoelasticity profile, including a tan δ peak temperature of 15.0° C. or lower and a tan δ value of 0.13 or higher at 55° C., achieved through the use of a trifunctional or higher polyfunctional isocyanate and a specific catalyst for efficient crosslinking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If polyurethane elastomer is used for cleaning members, then excellent elastic performance and wear resistance are achieved, but wiping performance deteriorates at high temperatures
Solution Approach 1:
The patent changes the chemical composition parameters of the polyurethane elastomer by incorporating specific ratios of polyether polyol (5-50 wt%), polyester polyol (45-95 wt%), and polyfunctional isocyanate (5-50 wt%). This compositional parameter adjustment optimizes the balance between wear resistance and high-temperature wiping performance, preventing the deterioration that occurs with conventional polyurethane formulations
Solution Approach 2:
The patent creates a composite polyurethane elastomer system combining multiple polyol types (polyether and polyester) with polyfunctional isocyanate. This composite material approach integrates the advantages of different polymer components to achieve both excellent wear resistance and stable wiping performance at elevated temperatures, resolving the contradiction between durability and performance stability
2Productivity
If cleaning members are used in high-temperature environments or for prolonged periods, then cleaning function is performed, but wiping performance decreases due to temperature rise
Solution Approach 1:
The patent adjusts the viscoelasticity parameters of the polyurethane elastomer by controlling the glass transition temperature through specific polyol and isocyanate combinations. The resulting material maintains appropriate softness and elasticity at elevated temperatures (up to 80°C), ensuring that wiping performance does not deteriorate even during prolonged use or in high-temperature environments
Solution Approach 2:
The patent optimizes the local properties of the polyurethane elastomer at the contact surface with the to-be-cleaned member. By controlling the composition to achieve specific tan δ values (0.30 or less at 20°C, and maintaining stability at 55°C), the surface exhibits optimal friction and adhesion characteristics for effective wiping, while the bulk material provides structural integrity and wear resistance
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 ensures stable wiping performance and vibration damping properties, preventing the degradation of cleaning efficiency even at elevated temperatures, thereby maintaining effective cleaning performance over extended periods and in high-temperature conditions.
Implementation Method 1
the use of a trifunctional or higher polyfunctional isocyanate and a specific catalyst for efficient crosslinking
Implementation Method 2
a peak temperature of a peak denoting a maximum value of tan δ is present at 15.0° C. or below, and a maximum value of tan δ is from 0.20 to 0.55, and tan δ at a temperature of 55° C. is 0.13 or larger
Implementation Method 3
The solution ensures stable wiping performance and vibration damping properties
Data Source
AI summary
Provided is a cleaning member, comprising an elastic member that includes polyurethane, wherein: when tan δ of a test piece sampled from the elastic member is measured in the temperature range of −20° C. to +60° C., the peak temperature of a peak indicating the maximum value of tan δ is at 15.0° C. or below; the maximum value of tan δ is 0.20 to 0.55; tan δ at a temperature of 55° C. is 0.13 or larger; and where the detected quantity of all ions obtained when the test piece is heated at a rate of temperature increase of 10° C./second to 1000° C. using a direct-sampling mass spectrometer is M1 and the integrated intensity of a peak in a derived ion thermogram that corresponds to a range of m/z values originating in multifunctional isocyanate with at least three isocyanate groups is M2, M2/M1 is at least 0.001.