Natural Rubber Masterbatch Carbon Black Dispersion
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Solution Overview
Problem
Existing natural rubber master batch production methods fail to achieve optimal abrasion resistance without compromising heat build-up, as high carbon black filling leads to poor dispersion and increased heat generation.
Innovation Solution
A production method involving a specific range of carbon black mixing (10-100 parts by mass) with natural rubber latex, where carbon black has a CTAB adsorption specific surface area of 120-160 m2/g, 24M4 DBP oil absorption of 50-100 mL/100 g, and toluene discoloration transmittance of 75-95%, enhancing dispersibility and reinforcing properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If carbon black is highly filled to prevent rubber deformation, then reinforcement is improved, but dispersion deteriorates and heat generation increases
Solution Approach 1:
The invention changes the surface area parameter of carbon black from conventional high surface area (180-250 m²/g) to specifically 120-160 m²/g, and controls the mixing amount within 10-100 parts by mass based on 100 parts by mass of natural rubber component. This parameter optimization resolves the contradiction by achieving adequate reinforcement while reducing heat generation and improving dispersion.
2Reliability
If carbon black is highly filled to enhance abrasion resistance, then abrasion resistance is improved, but dispersion deteriorates
Solution Approach 1:
The invention optimizes the surface area parameter of carbon black to 120-160 m²/g and controls the mixing amount within 10-100 parts by mass based on 100 parts by mass of natural rubber component. This parameter control achieves adequate abrasion resistance while maintaining good dispersion of carbon black in the rubber matrix.
3Reliability
If carbon black mixing amount is increased to improve abrasion resistance, then abrasion resistance is improved, but heat build-up increases
Solution Approach 1:
The invention changes the surface area parameter of carbon black to 120-160 m²/g and optimizes the mixing amount to within 10-100 parts by mass based on 100 parts by mass of natural rubber component. This parameter optimization achieves adequate abrasion resistance while maintaining low heat build-up, resolving the contradiction between these two properties.
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 produces a natural rubber master batch that balances abrasion resistance and low heat build-up, improving tire performance on rough roads and heavy loads without impairing processability or heat resistance.
Implementation Method 1
an aqueous slurry having carbon black dispersed in water
Implementation Method 2
a cetyltrimethylammonium bromide (hereinafter sometimes referred to as 'CTAB') adsorption specific surface area
Data Source
AI summary
The present invention is to provide a production method of a natural rubber master batch including a step of mixing a natural rubber latex and an aqueous slurry having carbon black dispersed in water, wherein a mixing amount of the carbon black is from 10 to 100 parts by mass based on 100 parts by mass of a natural rubber component; and the carbon black is satisfied with the relationships expressed by (1) 120<CTAB adsorption specific surface area<160, (2) 50<24M4DBP<100, and (3) 75<toluene discoloration transmittance<95. Also, the present invention is to provide a natural rubber master batch obtained by the subject production method. Furthermore, the present invention is to provide a rubber composition using the foregoing natural rubber master batch and a tire using the subject rubber composition.