Fiber Coating Rubber Composition for Long-Vulcanization Adhesion
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing rubber compositions for fibers exhibit low adhesiveness to fiber reinforcing materials after long vulcanization times, and ternary rubber compositions with bismaleimide compounds fail to achieve the required level of adhesiveness due to non-uniform mixing issues.
Innovation Solution
A coating rubber composition comprising natural rubber, styrene-butadiene rubber, butadiene rubber, a tackifier, sulfur, and a bismaleimide compound, with specific mass ratios and molecular weight ranges, is developed to enhance adhesiveness to fiber reinforcing materials even after prolonged vulcanization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If vulcanization time is extended to ensure complete curing of large rubber products, then curing completeness is improved, but adhesiveness between fiber reinforcing material and coating rubber deteriorates
Solution Approach 1:
The patent changes the chemical composition parameters of the rubber composition by incorporating specific ratios of natural rubber (50-70 parts), styrene-butadiene rubber (15-30 parts), and butadiene rubber (15-30 parts), along with controlled amounts of bismaleimide compound (0.1-1.0 part) and sulfur (1.0-3.0 parts). This parameter optimization enables the composition to cure completely even during extended vulcanization while preserving fiber-rubber adhesiveness through balanced crosslinking density.
2Strength
If bismaleimide compound is added to ternary rubber composition to enhance crosslinking, then crosslinking density is improved, but mixing uniformity deteriorates
Solution Approach 1:
The patent optimizes the concentration parameter of bismaleimide compound to a low range (0.1-1.0 part per 100 parts rubber component) and controls the sulfur content (1.0-3.0 parts). These parameter adjustments ensure that the crosslinking agents are present in sufficient quantities to achieve high crosslinking density but in controlled amounts that prevent aggregation and maintain uniform distribution throughout the ternary rubber matrix.
Solution Approach 2:
The patent creates a composite vulcanization system combining bismaleimide compound and sulfur as dual crosslinking agents. The bismaleimide provides efficient crosslinking at low concentrations, while sulfur complements the crosslinking network. This composite approach achieves high crosslinking density with improved mixing uniformity compared to using high concentrations of a single crosslinking agent.
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 excellent adhesiveness to fiber reinforcing materials after long vulcanization times, as demonstrated by improved peel strength and rubber coverage, ensuring superior performance in applications like marine hoses.
Implementation Method 1
a rubber body being formed by subjecting a rubber composition containing from 1.0 to 5.0 PHR of a maleimide-based vulcanizing agent to molding vulcanization
Implementation Method 2
a composition including a rubber component containing a natural rubber, a styrene-butadiene rubber, and a butadiene rubber, a tackifier, sulfur, and a bismaleimide compound achieves excellent adhesiveness
Data Source
AI summary
[Object] A coating rubber composition for fibers, exhibiting excellent adhesiveness to a fiber reinforcing material even after vulcanization for a long period of time, and a marine hose formed by using the coating rubber composition. [Resolution means] A coating rubber composition for fibers including a rubber component containing a natural rubber, a styrene-butadiene rubber, and a butadiene rubber, a tackifier, sulfur, and a bismaleimide compound; and a marine hose formed by using the coating rubber composition.