Polyurethane Transmission Belt Low-Temperature Durability
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Solution Overview
Problem
Polyurethane transmission belts face durability issues at low temperatures due to grease bloom, which reduces their effectiveness in cold environments, as existing solutions with lubricants of 50 to 80°C melting point fail to maintain durability beyond room temperature.
Innovation Solution
Incorporating 1,2-cyclohexane dicarboxylic acid diisononyl ester as a high-functioning plasticizer in the belt-molding material, which is thermally hardened with a prepolymer and hardener, providing improved bleed-out properties and non-volatility to act as a lubricant and surface protectant, enhancing durability across varying temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a grease of 50 to 80°C melting point is used as a lubricant in the polyurethane transmission belt, then the durability is improved at room temperature to around 50°C, but the grease seeps onto the belt surface to produce bloom at low temperatures below room temperature, making the belt not durable enough in a low-temperature environment
Solution Approach 1:
The patent changes the melting point parameter of the lubricant from 50-80°C (conventional grease) to -50 to 0°C (fatty acid ester or its mixture). This parameter change allows the lubricant to remain in liquid state at low temperatures, preventing bloom while maintaining durability across a wider temperature range including low-temperature environments.
Solution Approach 2:
The patent uses fatty acid ester as a replacement substance that copies the lubricating function of conventional grease but with improved low-temperature performance. The fatty acid ester or its mixture serves as a functional copy that maintains the essential lubrication properties while eliminating the bloom issue at low temperatures.
2Reliability
If a lubricant is added to improve durability, then the belt surface becomes lubricated and durability improves, but the lubricant may volatilize or migrate over time, reducing sustained effectiveness
Solution Approach 1:
The patent ensures continuous lubrication by selecting fatty acid ester with appropriate molecular weight and properties that provide sustained bleed-out over time. The lubricant continuously migrates to the belt surface during service, maintaining a fresh lubricating film throughout the belt's operational life, thus ensuring continuous useful action rather than depleting lubrication.
Solution Approach 2:
The patent employs a small amount of fatty acid ester (0.1-5 parts by weight per 100 parts of polyol) that acts as a long-lasting lubricant through controlled bleed-out. Rather than requiring large initial amounts, the system uses a small quantity that continuously replenishes the surface film over time, effectively making the lubricant last throughout the belt's service life.
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 use of 1,2-cyclohexane dicarboxylic acid diisononyl ester significantly improves the durability of polyurethane transmission belts by maintaining lubrication and surface protection at low temperatures, extending belt life and preventing hardening, thus addressing the temperature-related durability issues.
Implementation Method 1
Offering excellent bleed-out property, 1,2-cyclohexane dicarboxylic acid diisononyl ester is a high-functioning plasticizer that seeps onto the belt surface to function as a lubricant and surface protectant
Implementation Method 2
seeps onto the belt surface to function as a lubricant and surface protectant
Implementation Method 3
manufactured by thermally hardening in dies a belt-molding material containing the 1,2-cyclohexane dicarboxylic acid diisononyl ester
Data Source
Figure 1
AI summary
An object is to provide a polyurethane transmission belt offering excellent durability, as well as a belt-molding material for manufacturing such transmission belt. As a solution, a polyurethane transmission belt is provided that contains 1,2-cyclohexane dicarboxylic acid diisononyl ester expressed by Chemical Formula (1) below.