Polyurethane Belt Elastomer Composition for Strong, Smooth Teeth
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Solution Overview
Problem
There is a lack of a polyurethane elastomer that balances both strength and surface smoothness, making it unsuitable for forming transmission belts like toothed belts.
Innovation Solution
A urethane composition comprising a urethane prepolymer derived from a long chain polyol and diphenylmethane diisocyanate, combined with a plasticizer and a polyol crosslinking agent, is used to create a polyurethane elastomer with enhanced strength and surface smoothness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional polyurethane elastomers are used to form transmission belts, then the belt body can be formed with basic structural integrity, but the teeth cannot achieve both excellent strength and excellent surface smoothness simultaneously
Solution Approach 1:
The invention changes the chemical composition parameters of the urethane composition by specifying a long chain polyol with molecular weight of 300 or more and diphenylmethane diisocyanate as main components, along with specific additives. This parameter change enables the polyurethane elastomer to achieve both high strength and excellent surface smoothness, resolving the contradiction between strength and manufacturing precision of the teeth.
Solution Approach 2:
The invention creates a composite urethane composition by combining multiple components: long chain polyol, diphenylmethane diisocyanate, and specific additives. This composite material approach allows the polyurethane elastomer to simultaneously achieve excellent strength and surface smoothness properties that cannot be obtained with conventional single-component elastomers.
2Reliability
If various elastomers are used to form transmission belts, then basic material properties can be achieved, but a polyurethane elastomer with both excellent strength and surface smoothness has not yet been found
Solution Approach 1:
The invention specifies precise parameter ranges for the polyurethane elastomer composition, including long chain polyol with molecular weight of 300 or more and specific ratios of components. These parameter changes ensure the elastomer achieves both reliability for transmission belt applications and excellent strength, making it suitable for forming teeth that require both properties.
3Ease of operation
If the teeth of the toothed belt are required to have both excellent strength and excellent surface smoothness, then the transmission belt can function properly, but conventional polyurethane elastomers cannot achieve both properties simultaneously
Solution Approach 1:
The invention changes the compositional parameters of the urethane composition to include long chain polyol (molecular weight 300 or more) and diphenylmethane diisocyanate as main components with specific additives. This enables the teeth to achieve both excellent strength and surface smoothness, ensuring proper functional performance of the toothed belt while resolving the manufacturing precision challenge.
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 resulting polyurethane elastomer exhibits improved strength and surface smoothness, making it suitable for applications such as toothed belts, with specific properties like JIS A hardness and dynamic friction coefficient within desired ranges.
Implementation Method 1
a urethane prepolymer that is a reaction product between a long chain polyol having a molecular weight of 300 or more and diphenylmethane diisocyanate
Implementation Method 2
a polyol crosslinking agent
Data Source
AI summary
An object is to provide a polyurethane elastomer excellent in strength and surface smoothness. To attain the object, a urethane composition including a certain prepolymer, a plasticizer and a crosslinking agent is provided.