Water-Based Rubber Latex Coating for Anti-Fraying Aramid Fiber Cords
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Solution Overview
Problem
Existing methods for producing rubber-reinforcing cords, such as those using aramid fibers, face challenges with low productivity and insufficient anti-fraying properties, leading to defects like fraying and reduced durability in rubber products.
Innovation Solution
A water-based treatment agent comprising rubber latex, a crosslinking agent, and a filler is applied to form a coating on aramid fiber strands, enhancing binding strength and anti-fraying properties without significant productivity losses, by adjusting the mass ratio of crosslinking agent and filler within specific ranges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional treatment methods using epoxy compounds and RFL are employed, then anti-fraying properties are improved, but productivity is reduced due to complex processes requiring vacuum pressure treatment and simultaneous twisting with treatment application
Solution Approach 1:
The invention changes the chemical composition parameters of the treatment agent by incorporating specific rubber latex components (carboxyl-modified hydrogenated nitrile rubber or carboxyl-modified nitrile rubber) with defined carboxyl group contents, replacing conventional epoxy compound-based treatments. This parameter change enables improved anti-fraying properties through enhanced chemical bonding while simplifying the treatment process to eliminate vacuum pressure requirements and maintain high productivity
Solution Approach 2:
The invention uses composite material formulation by combining rubber latex with specific fillers (carbon black and/or silica) and crosslinking agents in defined proportions. This composite approach creates a treatment agent that provides both excellent adhesion to aramid fibers and rubber components, achieving superior anti-fraying properties while maintaining process simplicity and high productivity through a single-dip treatment
2Strength
If treatment agents with high crosslinking agent content are used, then binding strength is improved, but coating balance and productivity are compromised
Solution Approach 1:
The invention optimizes the crosslinking agent content parameter within a specific range (5-50 parts by mass per 100 parts by mass of rubber latex solids) to achieve adequate binding strength without excessive crosslinking. This controlled parameter adjustment ensures proper coating formation and balance while maintaining high productivity, avoiding the need for overly complex multi-step processes
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 treated rubber-reinforcing cords exhibit improved anti-fraying properties, reducing fraying and enhancing durability in rubber products like timing belts, with a balanced coating that maintains productivity.
Implementation Method 1
a crosslinking agent... A content of the crosslinking agent is 50 parts by mass or more and 150 parts by mass or less per 100 parts by mass of solids contained in the rubber latex
Implementation Method 2
a filler... A content of the filler is more than 50 parts by mass and 80 parts by mass or less per 100 parts by mass of the solids contained in the rubber latex
Data Source
AI summary
It is an object to improve the anti-fraying properties of rubber-reinforcing cords without significant reduction in productivity. The present invention provides a water-based treatment agent for forming a rubber-reinforcing cord having a coating. The water-based treatment agent includes a rubber latex, a crosslinking agent, and a filler. A content of the crosslinking agent is 50 parts by mass or more and 150 parts by mass or less per 100 parts by mass of solids contained in the rubber latex, and a content of the filler is more than 50 parts by mass and 80 parts by mass or less per 100 parts by mass of the solids contained in the rubber latex.