Rubber Surface Modifier Using Higher Alcohols to Suppress Wax Blooming
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Solution Overview
Problem
Existing rubber compositions face challenges in reducing wax blooming without compromising ozone resistance or improving appearance, as conventional methods either fail to enhance appearance or decrease ozone resistance, and higher alcohols are expensive and inefficient.
Innovation Solution
A surface modifier for rubber compositions is developed, comprising a specific carbon number distribution of higher alcohols, including a hydrolyzate of rice bran wax, which balances ozone resistance and appearance improvement while being economically efficient.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If hydrocarbon-based high-melting point waxes are blended to suppress wax blooming, then appearance is improved, but ozone resistance decreases
Solution Approach 1:
The invention changes the chemical composition parameters of the wax blend by introducing higher alcohols with specific carbon numbers (20-40) and controlling their content (1-20 parts by weight per 100 parts by weight of anti-aging wax). This parameter adjustment allows the wax to form a film that suppresses blooming while maintaining ozone resistance, resolving the contradiction between appearance improvement and ozone protection.
Solution Approach 2:
The invention creates a composite wax system combining hydrocarbon-based anti-aging wax with higher alcohols of specific carbon numbers. This composite material exhibits both the blooming suppression capability of high-melting-point waxes and the ozone resistance of rubber-compatible additives, simultaneously achieving appearance improvement and maintaining reliability.
2Quantity of substance
If animal and plant wax are blended to suppress wax blooming, then blooming is reduced, but appearance deteriorates due to finer wax crystals
Solution Approach 1:
The invention changes the physical parameters of the wax crystalline structure by adding higher alcohols that act as crystal growth modifiers. These alcohols control the crystallization process to form larger, coarser wax crystals instead of fine crystals, thereby maintaining appearance quality while achieving blooming suppression through adjusted crystalline morphology.
3Shape
If higher alcohols with DSC peak temperature of 60°C to 105°C are used to reduce wax blooming, then appearance is improved, but ozone resistance may be considerably decreased
Solution Approach 1:
The invention refines the temperature parameter specification by setting the DSC peak temperature range of higher alcohols to 70°C-90°C, which is narrower and higher than the conventional 60°C-105°C range. This precise temperature control ensures that the higher alcohols remain stable at rubber processing and service temperatures, preventing ozone resistance degradation while still suppressing wax blooming and improving appearance.
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 surface modifier effectively enhances the appearance of rubber compositions without decreasing ozone resistance, using a tailored carbon number distribution of higher alcohols and hydrolyzed rice bran wax, resulting in improved appearance and ozone resistance.
Implementation Method 1
Blended wax precipitates (also referred to as 'bloom' or 'blooming') on the surface of rubber to form a thin film
Implementation Method 2
higher alcohols obtained by hydrolyzing rice bran wax which is one type of plant wax
Data Source
AI summary
The present invention provides a surface modifier for a rubber composition that can enhance appearance without decreasing ozone resistance of the rubber composition. The surface modifier for a rubber composition of the present invention includes a hydrocarbon-based anti-aging wax for rubber (B) and an appearance-improving agent (C), in which: the content of a linear monovalent primary alcohol is more than 1.5 parts by weight and less than 35 parts by weight per 100 parts by weight of the surface modifier for a rubber composition; per 100 parts by weight of the primary alcohol, the content of a component having 30 to 38 carbon atoms is more than 35 parts by weight; the content of a component having 12 to 26 carbon atoms is less than 25 parts by weight; and the content of a component having 42 to 68 carbon atoms is less than 25 parts by weight.