Rubber Composition Dry-Mixing Masterbatches
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Solution Overview
Problem
Existing rubber compositions used for pneumatic tires, particularly those involving the mixing of rubber wet masterbatches, face challenges in achieving low exothermic performance and high rubber hardness, as the homogenization process limits the formation of specific structures that enhance these properties.
Innovation Solution
A rubber composition is developed by dry-mixing rubber wet masterbatch A with a high nitrogen adsorption specific surface area carbon black and rubber wet masterbatch B with a low nitrogen adsorption specific surface area carbon black, at specific content ratios, to create a sea-island structure that improves vulcanized rubber's low exothermic performance and rubber hardness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If rubber wet masterbatches are mixed and dried to achieve homogeneity, then the composition becomes uniform throughout the system, but the low exothermic performance and rubber hardness are not improved
Solution Approach 1:
The invention applies local quality by creating a sea-island structure where different rubber phases with distinct properties are distributed throughout the material. The continuous phase (sea) and dispersed phase (island) each have different compositions and properties, allowing local regions to contribute differently to overall performance, particularly enabling low exothermic performance while maintaining structural integrity
Solution Approach 2:
The invention uses composite materials by combining two different rubber wet masterbatches (A and B) with different carbon black contents to form a multi-phase system. This composite structure allows the material to exhibit properties that neither phase alone could achieve, specifically achieving both low exothermic performance and high rubber hardness through the synergistic interaction of the sea and island phases
2Stability of the object's composition
If rubber wet masterbatches are mixed and dried to achieve homogeneity, then the composition becomes uniform throughout the system, but the rubber hardness is not easily heightened
Solution Approach 1:
The sea-island structure enables local quality enhancement where the dispersed island phases containing rubber wet masterbatch A (with higher carbon black content) are distributed within the continuous sea phase of rubber wet masterbatch B. This localized distribution of high carbon black regions provides enhanced rubber hardness while the overall composite maintains compositional stability
Solution Approach 2:
By forming a composite of two rubber wet masterbatches with different carbon black contents, the invention achieves rubber hardness enhancement through the reinforcing effect of the dispersed phase while maintaining the stability of the overall composition. The interaction between the sea and island phases creates a structure that resists deformation more effectively than a homogeneous mixture
3Temperature
If carbon blacks with different nitrogen adsorption specific surface areas are used in specific ratios, then low exothermic performance and rubber hardness are improved, but the mixing process becomes more complex
Solution Approach 1:
The invention applies preliminary action by pre-preparing two distinct rubber wet masterbatches (A and B) with specific carbon black contents and properties before combining them. This pre-preparation allows the final mixing step to be simpler while ensuring that the correct phases with appropriate properties are present in the correct proportions to achieve the desired sea-island structure and performance characteristics
Solution Approach 2:
The invention uses parameter changes by controlling the nitrogen adsorption specific surface area (NA and NB) and carbon black content ratios (LA and LB) of the two rubber wet masterbatches. By adjusting these parameters within specific ranges and satisfying the inequality NA×LA−NB×LB≥1800, the invention achieves optimal low exothermic performance and rubber hardness while managing mixing process complexity through defined parameter relationships
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 resulting vulcanized rubber exhibits enhanced low exothermic performance and increased rubber hardness, achieving a balance between fuel efficiency and rigidity in pneumatic tires.
Implementation Method 1
a carbon black A having a nitrogen adsorption specific surface area (N2SA) of NA (m2/g) and a carbon black B having a nitrogen adsorption specific surface area (N2SA) of NB (m2/g)
Data Source
AI summary
A rubber composition obtained by dry-mixing a rubber wet masterbatch A containing a carbon black A having a nitrogen adsorption specific: surface area (N2SA) of NA (m2/g) with a rubber wet masterbatch B containing a carbon black B having a nitrogen adsorption specific surface area (N2SA) of NB (m2/g),wherein the content ratio of the rubber wet masterbatch A to the rubber wet masterbatch B is from 5/95 to 40/60, andwhen the content proportion of the carbon black A in the rubber wet masterbatch A is represented by LA, and that of the carbon black B in the rubber wet masterbatch B is represented by LB, the specific expressions are satisfied.