Wet Rubber Masterbatch Antiaging Method
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Solution Overview
Problem
Existing rubber compositions used in tire production, particularly those employing dry rubber masterbatches, fail to provide adequate antiaging and abrasion resistance due to the consumption of antiaging agents during the mixing process, resulting in vulcanized rubbers that are not sufficiently resistant to thermal deterioration and wear.
Innovation Solution
A method involving the use of carbon black, a dispersing solvent, and a rubber latex solution to create a wet rubber masterbatch, where a specific compound is dispersed into the rubber solidified product containing water, enhancing its dispersibility and allowing for efficient radical capture by the antiaging agent, thereby improving thermal and abrasion resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If antiaging agent is mixed with rubber component in solid phase (dry-mixed), then mixing efficiency is improved, but antiaging agent captures radicals generated by shearing and is consumed in large quantity, resulting in poor antiaging property of vulcanized rubber
Solution Approach 1:
The patent introduces a specific compound (formula I) as an intermediary substance that mediates between the rubber component and antiaging agent. This compound disperses in the rubber component first, then the antiaging agent is added and disperses in the mixture containing the intermediary compound. The intermediary compound prevents direct contact between antiaging agent and rubber component during mixing, thereby preventing radical capture and consumption of the antiaging agent while maintaining effective mixing.
2Ease of operation
If carbon black is mixed with rubber in solid phase (dry rubber masterbatch), then composition is easier to handle, but carbon black dispersibility in rubber is insufficient, resulting in poor abrasion resistance
Solution Approach 1:
The patent changes the physical state parameter of the rubber component from solid to liquid (using rubber latex solution). By converting the rubber component to a liquid state, carbon black can be effectively dispersed throughout the rubber matrix. The rubber latex solution allows carbon black particles to distribute uniformly, and after vulcanization, the rubber forms a solid structure with excellent carbon black dispersibility and abrasion resistance.
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 method results in vulcanized rubbers with enhanced antiaging properties and abrasion resistance, suitable for high-load tire applications, by ensuring the antiaging agent remains effective and the compound maintains high dispersibility throughout the tire production process.
Implementation Method 1
the compound represented by the formula (I) shows hydrophilicity. Thus, even when a dry-state rubber is dry-mixed with the compound represented by the formula (I), the dispersibility of the compound represented by the formula (I) in the rubber is not easily improved. However, according to the present producing method, in the step (iii) corresponding to a dehydrating step, the compound represented by the formula (I) is dispersed into the water-containing rubber solidified product including the carbon black.
Implementation Method 2
when an antiaging agent, which is used as one raw material of a dry rubber masterbatch, is mixed with the other raw materials of the masterbatch in a solid phase (dry-mixed), the antiaging agent captures radicals generated by the shearing of the rubber component to be consumed in a large quantity
Implementation Method 3
a step (ii) of solidifying the resultant rubber latex solution including the carbon black to produce a rubber solidified product including the carbon black
Data Source
AI summary
A method for producing a tire member that makes it possible to yield a vulcanized rubber high in antiaging property includes: (i) mixing carbon black, a dispersing solvent and a rubber latex solution with each other to produce a rubber latex solution including the carbon black, (ii) solidifying the rubber latex solution including the carbon black to produce a rubber solidified product including the carbon black; (iii) adding, to the rubber solidified product including the carbon black, a compound represented by the following formula (I):and dispersing the compound represented by the formula (I) into the water-containing rubber solidified product including the carbon black while dehydrating the rubber solidified product including the carbon black to produce a wet rubber masterbatch; and (iv) adding, to the resultant wet rubber masterbatch, the compound represented by the formula (I) and an antiaging agent further, and dry-mixing these substances with each other.