Low-Odor Rubber Composition With High-Purity 6PPD and S-TMQ
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Solution Overview
Problem
Current rubber compositions for tires face challenges in reducing odor and VOC emissions while maintaining thermal oxidative aging-resistance and tension fatigue resistance, with existing methods either covering odors without reducing VOCs or increasing emissions and health risks.
Innovation Solution
A rubber composition formulation using a specific combination of high-purity 6PPD antidegradant and S-TMQ antidegradant, replacing conventional combinations, which reduces VOC emission and odor without adding odor inhibitors or adsorbents, improving thermal oxidative aging-resistance and tension fatigue resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional antidegradant combinations (6PPD and TMQ) are used, then thermal oxidative aging-resistance is improved, but odor and VOC emissions increase
Solution Approach 1:
The patent changes the chemical parameters of the antidegradant composition by specifying precise purity requirements (6PPD ≥98%, S-TMQ with specific dimer/trimer/tetramer ratios ≥80%) and replacing conventional TMQ with a specially structured S-TMQ. This parameter optimization reduces the formation of odorous volatiles while preserving the thermal oxidative aging protection function.
Solution Approach 2:
The patent creates an optimized composite antidegradant system combining 6PPD and S-TMQ in specific proportions (6PPD: 0.1-8 parts, S-TMQ: 0.5-3 parts per 100 parts rubber). This composite approach leverages the synergistic effects of both antidegradants to achieve both low odor and high aging resistance.
2Object-generated harmful factors
If deodorizing additives are added to reduce odor, then odor is reduced, but VOC emission and health risk increase
Solution Approach 1:
Instead of using deodorizing additives that mask or adsorb odors (which increase VOC emissions), the patent converts the harmful odorous byproducts into beneficial outcomes by optimizing the antidegradant chemistry to prevent their formation in the first place. The high-purity 6PPD and S-TMQ combination reduces the generation of odorous volatiles like MIBK and aniline, achieving odor reduction without harmful additives.
Solution Approach 2:
The patent extracts and eliminates the harmful components from the antidegradant system by specifying high purity levels and restrictive compositional requirements. By taking out the impurities and unwanted byproducts through precise material selection, the patent achieves odor reduction without needing additional deodorizing agents.
3Reliability
If more antidegradant is added to improve aging resistance, then thermal oxidative aging-resistance is improved, but odor and VOC emissions increase
Solution Approach 1:
The patent changes the quality parameters of the antidegradant composition by specifying high purity levels (6PPD ≥98%, S-TMQ with specific oligomer ratios) and controlled dosage ranges. This ensures that the antidegradant provides maximum protection with minimal odor-generating byproducts, avoiding the need to increase dosage.
Solution Approach 2:
The patent uses a composite antidegradant system with 6PPD and S-TMQ in optimized proportions. This composite approach provides enhanced aging resistance through synergistic effects while maintaining low odor emissions, eliminating the need to increase total antidegradant quantity.
Data Source
AI summary
A formulation for rubber composition with reduced odor and good thermal oxidative aging-resistance and tension fatigue resistance comprising 100 parts by weight of a diene elastomer, 30 to 70 parts by weight of a reinforcing filler, 0.1 to 8 parts by weight of an antidegradant composition, and 0.5 to 3 parts by weight of a crosslinker, wherein the antidegradant composition includes a 6PPD antidegradant with a purity of equal to or greater than about 98% and an S-TMQ. The rubber composition has no added odor inhibitor/adsorbent or deodorizing additive, while by using combination of 6PPD with purity of equal to or greater than about 98% and an S-TMQ instead of traditional combination of 6PPD and a TMQ, the VOC emission of the rubber composition is effectively reduced, the odor grade is reduced, and the thermal oxidative aging-resistance and tension fatigue resistance is improved.