Hydrazone Rubber Additive for Low Heat and Processability
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Solution Overview
Problem
Conventional rubber compositions with low heat generating properties for tires compromise on wear resistance and fracture resistance, and the use of hydrazide compounds in these compositions leads to increased unvulcanized viscosity, reducing processability.
Innovation Solution
Incorporating a hydrazone compound with a specific structure into the rubber composition enhances the interaction between the rubber component and carbon black, improving both low heat generating property and processability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If carbon black particle diameter is increased or blending quantity is decreased to achieve low heat generating property, then low heat generating property is improved, but wear resistance and fracture resistance decrease
Solution Approach 1:
The patent changes the chemical parameter of the carbon black-rubber interface by introducing a hydrazone compound that forms strong chemical bonds with carbon black surfaces. This chemical modification allows the use of lower carbon black quantities while maintaining reinforcement effects, thereby improving heat generating property without sacrificing wear and fracture resistance.
Solution Approach 2:
The patent creates a composite system by combining rubber with carbon black and a hydrazone compound (specifically 2,3-dihydroxybenzohydrazide or similar compounds). This composite approach enhances the interfacial interaction between rubber and carbon black, allowing optimized carbon black loading that simultaneously achieves low heat generation and high mechanical strength.
2Strength
If a hydrazide compound is contained in the rubber composition to improve chemical interaction, then chemical interaction between rubber and carbon black is enhanced, but unvulcanized viscosity increases and processability decreases
Solution Approach 1:
The patent changes the molecular structure parameter from hydrazide compounds to hydrazone compounds (specifically 2,3-dihydroxybenzohydrazide or its derivatives). This structural modification reduces the compound's reactivity during mixing, lowering unvulcanized viscosity and improving processability, while still enabling effective chemical interaction with carbon black during vulcanization.
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 rubber composition with the hydrazone compound achieves better low heat generating property and processability without sacrificing other properties like strength, resulting in a tire with enhanced performance.
Implementation Method 1
interaction between the rubber component and carbon black can be enhanced as compared with conventional techniques using a hydrazide compound or a hydrazone compound
Data Source
AI summary
An additive for rubber that enables a rubber composition to have excellent low heat generating property and processability, a rubber composition containing the additive for rubber, and a tire using the same are provided. A rubber composition comprises a hydrazone compound represented by the following Formula (I):where R1 and R2 each independently represent a hydrogen atom, an alkyl group with a carbon number of 1 to 16, or an alkenyl group with a carbon number of 2 to 6, and A represents a group represented by the following Formula (A-1) or Formula (A-2):