Tire Coagulum Viscosity Control via Wet Compound Dispersion
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Solution Overview
Problem
The existing tire member manufacturing methods fail to effectively inhibit the increase in Mooney viscosity of unvulcanized rubber during storage, which affects the rubber's workability and storage stability.
Innovation Solution
A tire member manufacturing method involving the creation of a master batch by coagulating carbon-black-containing pre-coagulation rubber latex, adding and dispersing a compound according to Formula (I) within the coagulum, and incorporating a peptizing agent and processing additive to enhance dispersion and reaction, thereby inhibiting Mooney viscosity increase.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the compound according to Formula (I) is added to dried rubber, then the compound can be incorporated into the rubber, but the dispersion is insufficient and Mooney viscosity increases during storage
Solution Approach 1:
The patent changes the physical state parameter of the rubber from dried to wet (coagulum state with water content), which fundamentally alters how the compound disperses and reacts. The water content enables the compound to disperse uniformly throughout the rubber matrix, preventing aggregation and ensuring stable storage properties without excessive Mooney viscosity increase.
Solution Approach 2:
Water acts as an intermediary medium that facilitates the dispersion and reaction between the compound according to Formula (I) and the rubber in the coagulum. This intermediary allows for uniform distribution of the compound before final drying, resolving the contradiction between achieving good dispersion and maintaining storage stability.
2Stability of the object's composition
If the compound according to Formula (I) is added to wet coagulum, then the dispersion and reaction are enhanced, but additional processing steps are required
Solution Approach 1:
The patent performs the compound addition and dispersion action preliminarily during the coagulum stage, before final drying and processing. This preliminary action ensures uniform distribution and adequate reaction time, while the subsequent standard drying and processing steps complete the formulation without requiring additional specialized equipment or complex procedures.
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
This method significantly improves the dispersion and reaction of the compound within the rubber, effectively inhibiting the increase in Mooney viscosity and enhancing storage stability, leading to better workability and fatigue resistance.
Implementation Method 1
a water-absorbing capability of the coagulum is used to disperse a compound within the coagulum
Implementation Method 2
an operation in which the compound according to Formula (I) is dispersed within the mixture in the presence of water
Data Source
AI summary
A first tire member manufacturing method includes an operation in which a master batch is made, and an operation in which the master batch, peptizing agent, and processing additive are mixed. The operation in which the master batch is made includes an operation in which carbon-black-containing pre-coagulation rubber latex is coagulated to obtain a coagulum, an operation in which a compound according to Formula (I), below, is added to the water-containing coagulum, and an operation in which the compound according to Formula (I) is dispersed within the coagulum.In Formula (I), R1 and R2 each indicates a hydrogen atom, an alkyl group having 1 to 20 carbons, an alkenyl group having 1 to 20 carbons, or an alkynyl group having 1 to 20 carbons. R1 and R2 may be the same or different. M+ indicates sodium ion, potassium ion, or lithium ion.