Crosslinking Rubber Composition for Faster Tire Tread Vulcanization
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Solution Overview
Problem
Conventional crosslinking rubber compositions with an ethylene structure and crosslinkable unsaturated groups have insufficient crosslink density, leading to longer crosslinking times, lower tensile modulus, tear strength, and abrasion resistance due to a small amount of crosslinkable unsaturated groups.
Innovation Solution
A crosslinking rubber composition with a rubber polymer having an iodine value of 10 to 250 g/100 g, comprising 3% or more ethylene structure and less than 10% vinyl aromatic monomer block, combined with sulfur, a radical generator, and a vulcanization accelerator, to enhance crosslinking time, tensile modulus, tear strength, and abrasion resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the amount of crosslinkable unsaturated group is increased, then crosslinking time is reduced and crosslink density is increased, but the rubber polymer structure becomes more complex and harder to control
Solution Approach 1:
The patent applies parameter changes by precisely controlling the iodine value (10-250 g/100g), ethylene structure content (3-90%), and vinyl aromatic block content (0.1-10%) of the rubber polymer. These parameter specifications optimize the balance between crosslinking reactivity and polymer structure control, enabling sufficient crosslink density without excessive structural complexity
Solution Approach 2:
The patent uses composite materials by combining the rubber polymer with specific additives including sulfur (0.1-5 parts by mass), radical generators (0.1-5 parts by mass), and vulcanization accelerators (0.1-5 parts by mass). This composite approach enhances crosslinking efficiency and mechanical properties while maintaining manageable polymer structure
2Strength
If the crosslink density is increased, then tensile modulus and tear strength are improved, but the processing difficulty increases
Solution Approach 1:
The patent applies preliminary action by pre-introducing crosslinkable unsaturated groups into the rubber polymer structure during polymerization, rather than attempting to crosslink highly dense structures during processing. The polymer is prepared with controlled unsaturation (iodine value 10-250 g/100g) before crosslinking, making the material easier to process while ensuring high crosslink density is achieved during the controlled crosslinking stage
Solution Approach 2:
The patent controls processing ease through parameter specifications including iodine value (10-250 g/100g), ethylene structure (3-90%), and vinyl aromatic block content (0.1-10%). These parameters ensure the rubber remains processable before crosslinking while enabling high crosslink density to be achieved under controlled conditions
3Reliability
If the crosslink density is increased, then abrasion resistance is improved, but crosslinking time is extended
Solution Approach 1:
The patent uses intermediary substances including radical generators (0.1-5 parts by mass) and vulcanization accelerators (0.1-5 parts by mass) to mediate the crosslinking process. These intermediaries catalyze and accelerate the formation of crosslink bonds, enabling high crosslink density (improving abrasion resistance) to be achieved in reduced crosslinking time
Solution Approach 2:
The patent optimizes the balance between abrasion resistance and crosslinking time through parameter control: iodine value (10-250 g/100g) provides sufficient unsaturation for crosslinking, ethylene structure (3-90%) ensures polymer stability, and vinyl aromatic block content (0.1-10%) controls polymerization behavior. These parameters enable efficient crosslinking with high 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 composition achieves a shorter crosslinking time and improved mechanical properties, including increased tensile modulus, tear strength, and abrasion resistance, while maintaining flexibility and fuel economy.
Implementation Method 1
a crosslinking rubber composition containing a rubber polymer having an ethylene structure and containing a crosslinkable unsaturated group
Implementation Method 2
0.1 to 5.0 parts by mass of sulfur (B); 0.1 to 5.0 parts by mass of a radical generator (C)
Data Source
AI summary
An object of the present invention is to provide a crosslinking rubber composition with which a crosslinking time is less liable to be increased, and with which a crosslinked product excellent in a tensile modulus, tear strength and abrasion resistance can be obtained. The crosslinking rubber composition contains: 100 parts by mass of a rubber polymer (A) having an iodine value of 10 to 250 (g/100 g) and comprising 3% by mass or more of an ethylene structure and less than 10% by mass of a vinyl aromatic monomer block; 0.1 to 5.0 parts by mass of sulfur (B); 0.1 to 5.0 parts by mass of a radical generator (C); and 0.1 to 5.0 parts by mass of a vulcanization accelerator (D).