Rubber Additive Crystals for Low Heat Build-Up and Processability
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Solution Overview
Problem
Existing rubber additives do not effectively balance low heat build-up and processability, leading to suboptimal performance in rubber products like tires.
Innovation Solution
Development of novel crystals of 3-hydroxy-N′-(1,3-dimethylbutylidene)-2-naphthoic acid hydrazide with specific X-ray powder diffraction patterns and controlled precipitation methods to produce crystals A and B, which are used as rubber additives to enhance both low heat build-up and processability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional rubber additives are used, then processability is maintained, but low heat build-up performance is insufficient
Solution Approach 1:
The patent applies parameter changes by controlling the crystallization temperature (50°C or more) to obtain crystals with specific X-ray diffraction patterns. This temperature parameter control transforms the crystal structure to achieve both improved low heat build-up performance and processability, resolving the contradiction between these two properties.
Solution Approach 2:
The patent produces composite crystal structures containing multiple polymorphs (indicated by multiple characteristic peaks in X-ray diffraction patterns). This composite crystalline structure combines the benefits of different crystal forms, achieving both low heat build-up resistance and good processability that single-crystal forms cannot provide alone.
2Reliability
If crystal precipitation conditions are not optimized, then production simplicity is maintained, but crystal properties and performance are insufficient
Solution Approach 1:
The patent simplifies the production process by identifying a specific temperature parameter (50°C or more) that controls crystal nucleation and growth. This single parameter change enables the formation of high-performance crystals without requiring complex multi-step processes, resolving the contradiction between performance and process complexity.
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 novel crystals impart improved low heat build-up and processability to rubber compositions, resulting in rubber products with enhanced performance characteristics.
Implementation Method 1
forming a crystal nucleus in a solution containing 3-hydroxy-N′-(1,3-dimethylbutylidene)-2-naphthoic acid hydrazide at 50° C. or more
Implementation Method 2
precipitating crystals from a solution of 3-hydroxy-N′-(1,3-dimethylbutylidene)-2-naphthoic acid hydrazide in a solvent containing methanol and methyl isobutyl ketone
Data Source
AI summary
Crystals of 3-hydroxy-N′-(1,3-dimethylbutylidene)-2-naphthoic acid hydrazide having an X-ray powder diffraction pattern comprising a peak of maximum intensity at an angle of diffraction (2θ) of 6.9±0.2°, 11.4±0.2° and/or 25.2±0.2°. The crystals are useful as rubber additives in tires.