Molded Rubber Bale Composition for Clean Molding and Stable Viscosity
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Solution Overview
Problem
Conventional rubber compositions for tire treads with an ethylene structure face issues such as mold contamination, increased viscosity over time, peeling from molded bales, and difficulty in adhering packaging sheets, due to their properties.
Innovation Solution
A rubber composition with specific titanium and aluminum content ranges, along with a rubber-like polymer having an iodine value of 10 to 250, 3% ethylene structure, and less than 10% vinyl aromatic monomer block, is developed to suppress contamination, viscosity increase, and peeling, while enhancing packaging sheet adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a rubber-like polymer with an ethylene structure is used to increase mechanical strength, then mechanical strength is improved, but mold contamination increases
Solution Approach 1:
The invention changes the chemical composition parameters of the rubber-like polymer by specifying the ethylene structure content (3% or more) and vinyl aromatic monomer block content (less than 10% by mass), along with controlling titanium (3-120 ppm) and aluminum (less than 2 ppm) content. These parameter changes resolve the contradiction by maintaining mechanical strength while reducing mold contamination.
2Strength
If a rubber-like polymer with an ethylene structure is used to increase mechanical strength, then mechanical strength is improved, but viscosity of the rubber composition increases over time
Solution Approach 1:
The invention controls the viscosity stability by specifying precise compositional parameters: ethylene structure (3% or more), vinyl aromatic monomer block (less than 10% by mass), titanium content (3-120 ppm), and aluminum content (less than 2 ppm). These parameter changes ensure both mechanical strength and viscosity stability over time.
3Strength
If a rubber-like polymer with an ethylene structure is used, then mechanical strength is improved, but peeling of the rubber composition from the molded bale occurs
Solution Approach 1:
The invention resolves the adhesion issue by optimizing the chemical composition parameters: ethylene structure (3% or more), vinyl aromatic monomer block (less than 10% by mass), titanium (3-120 ppm), and aluminum (less than 2 ppm). These parameter changes ensure both mechanical strength and reliable adhesion to the molded bale.
4Strength
If a rubber-like polymer with an ethylene structure is used, then mechanical strength is improved, but packaging sheet adhesion to the molded bale becomes difficult
Solution Approach 1:
The invention improves packaging sheet adhesion by controlling the chemical composition: ethylene structure (3% or more), vinyl aromatic monomer block (less than 10% by mass), titanium (3-120 ppm), and aluminum (less than 2 ppm). These parameter changes maintain mechanical strength while enabling easy packaging sheet adhesion.
Data Source
AI summary
A molded bale of a rubber composition, containing: a rubber-like polymer (A) having an iodine value of 10 to 250, 3% by mass or more of an ethylene structure, and less than 10% by mass of a vinyl aromatic monomer block; and titanium (C), in which a content of the titanium (C) is 3 ppm or more and 120 ppm or less, and a content of aluminum (B) is less than 2 ppm.