Rubber Composition Whitening Suppression via Cashew Oil and Processing Aid
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Solution Overview
Problem
Existing rubber compositions for tires struggle to suppress whitening of the rubber surface while maintaining appearance and ozone resistance, as current solutions either fail to provide black and luster or require additional components that are not disclosed in previous patent documents.
Innovation Solution
A rubber composition comprising diene rubber, hydrocarbon type wax, cashew oil, and a processing aid with a specific carbon number distribution, specifically a fatty acid metal salt, amide, ester, or ester amide with 18-20 carbon atoms, which suppresses whitening and imparts black and luster to the rubber surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a wax is added to suppress deterioration by ozone and ultraviolet rays, then ozone resistance is improved, but the rubber surface whitens resulting in poor appearance
Solution Approach 1:
The invention changes the carbon number distribution parameter of the processing aid to resolve the contradiction. Specifically, it uses a processing aid where the proportion of fatty acids with 18-20 carbon atoms is 20-60 mass%, which optimizes the balance between ozone resistance and surface appearance by controlling the interaction between wax and processing aid on the rubber surface
Solution Approach 2:
The invention creates a composite system by combining wax with a specifically formulated processing aid having a defined carbon number distribution. This composite approach allows the wax to provide ozone resistance while the processing aid prevents excessive whitening, achieving both protection and aesthetic requirements simultaneously
2Illumination intensity
If a processing aid is added to suppress whitening by wax, then surface appearance is improved, but black and luster cannot be given to the rubber surface
Solution Approach 1:
The invention optimizes the carbon number distribution parameter of the processing aid to simultaneously achieve surface appearance improvement and black/luster effect. The specific range of 18-20 carbon atoms at 20-60 mass% proportion creates the right balance to prevent whitening while maintaining or enhancing the black and lustrous appearance
Data Source
AI summary
A rubber composition comprises a diene rubber, a hydrocarbon type wax, cashew oil and a processing aid. The rubber composition can suppress whitening of a rubber surface and additionally can give black and luster to the rubber surface. The processing aid comprises at least one selected from the group consisting of a fatty acid metal salt, a fatty acid amide, a fatty acid ester and a fatty acid ester amide, wherein the proportion of constituent fatty acids having from 18 to 20 carbon atoms is from 20 to 60 mass %. A pneumatic tire has a rubber part (for example, a tread rubber, a side wall rubber or a rim strip) comprising the rubber composition.