Method for manufacturing core wire for transmission belt, treatment agent, and kit for treatment
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for manufacturing power transmission belts, particularly those using para-aramid cords, face challenges in achieving firm adhesion between fibers in twisted yarn cords while maintaining bending fatigue resistance and fraying resistance, and in improving adhesiveness to rubber without imposing a significant environmental load.
Innovation Solution
A method involving a first treatment agent containing a condensate of resorcin and formaldehyde, carboxy-modified latex, and a polycarbodiimide resin with carbodiimide groups, applied to untreated yarns, which enhances adhesion between fibers and improves fraying resistance, along with optional additional treatment agents to further enhance adhesiveness and flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If adhesion treatment is performed by immersing para-aramid fiber in treatment agent, then adhesiveness between cord and rubber is improved, but the cord becomes rigid and bending fatigue resistance deteriorates
Solution Approach 1:
The patent changes the chemical composition parameters of the treatment agent by incorporating specific components (silane-modified rubber, zinc oxide, stearic acid) in controlled proportions. This allows optimization of the cross-linking reaction to achieve adequate adhesiveness while controlling the degree of rigidity to preserve bending fatigue resistance.
Solution Approach 2:
The treatment agent uses a composite system combining silane-modified rubber with inorganic additives (zinc oxide, stearic acid). This composite approach creates a multi-functional treatment layer that provides both adhesion and flexibility, resolving the contradiction between strength and bending fatigue resistance.
2Ease of operation
If adhesion treatment is performed on twisted yarn cord, then handling is easier, but peeling resistance and fraying resistance are insufficient compared to raw yarn treatment
Solution Approach 1:
The patent applies adhesion treatment to the twisted yarn cord before final belt assembly, allowing the treatment agent to penetrate and bond to the fiber surfaces in advance. This preliminary action ensures adequate peeling resistance is established before the cord is subjected to service loads.
Solution Approach 2:
The treatment agent composition is optimized to provide sufficient penetration and bonding capability even when applied to twisted yarn structures, maintaining adequate peeling resistance while allowing the twisted configuration to be used for handling convenience.
3Object-affected harmful factors
If aqueous treatment agent containing rubber component is used, then environmental load is reduced, but adhesion force between fibers inside cord is insufficient
Solution Approach 1:
The aqueous treatment agent uses a composite system combining silane-modified rubber with zinc oxide and stearic acid. This composite formulation enhances the adhesion force between fibers through synergistic interactions while maintaining the environmentally friendly aqueous base.
Solution Approach 2:
The patent optimizes the concentration and composition parameters of the aqueous treatment agent, including the ratio of rubber component to inorganic additives, to achieve sufficient fiber-to-fiber adhesion force while maintaining low environmental impact through the water-based formulation.
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 achieves firm adhesion between fibers in twisted yarn cords, maintains bending fatigue resistance, and improves fraying resistance while reducing the environmental impact by using a hydrophilic solvent-based treatment, effectively addressing the limitations of previous methods.
Implementation Method 1
a first treatment step of treating an untreated yarn of a cord for a power transmission belt with a first treatment agent containing a rubber composition (A) containing a condensate (A1) of a resorcin and formaldehyde, a rubber component (A2) containing a carboxy-modified latex, and a curing agent (A3) containing a polycarbodiimide resin having a plurality of carbodiimide groups
Implementation Method 2
a rubber component (A2) containing a carboxy-modified latex, and a curing agent (A3) containing a polycarbodiimide resin having a plurality of carbodiimide groups
Data Source
AI summary
The present invention relates to a method for manufacturing a cord for a power transmission belt, including a first treatment step of treating an untreated yarn of a cord for a power transmission belt with a first treatment agent containing: a rubber composition (A) containing a condensate (A1) of a resorcin and formaldehyde, a rubber component (A2) containing a carboxy-modified latex, and a curing agent (A3) containing a polycarbodiimide resin having a plurality of carbodiimide groups; and a hydrophilic solvent (B).