Aqueous adhesive, reinforcement fibers using same, and elastomer product using reinforcement fibers
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional methods for reinforcing fibers, such as those using RFL adhesives, face issues with contamination during processing and low productivity due to the use of resorcin-formalin, which are harmful, and alternative methods like liquid conjugated diene-based rubbers with crosslinking agents face challenges in long-term storage and adhesion stability.
Innovation Solution
An aqueous adhesive is developed using an oil-in-water emulsion of liquid conjugated diene-based rubber and an aqueous solution or dispersion of a crosslinking agent, specifically an epoxy resin or isocyanate resin, which reduces absorption into elastomers and enhances adhesion while minimizing environmental impact and process contamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If liquid conjugated diene-based rubber and crosslinking agent are mixed directly, then adhesion force is improved, but storage stability deteriorates and adhesion reduces over time
Solution Approach 1:
The adhesive composition is divided into two separate phases: an oil-in-water emulsion containing liquid conjugated diene-based rubber and a crosslinking agent. This segmentation prevents direct contact and premature reaction between the rubber and crosslinking agent, maintaining storage stability while preserving adhesion capability.
Solution Approach 2:
An emulsion system acts as an intermediary between the liquid conjugated diene-based rubber and crosslinking agent. The emulsion structure allows both components to coexist without direct reaction, enabling long-term storage stability while maintaining the ability to form strong adhesions when applied.
2Strength
If RFL adhesive containing resorcin-formalin resin is used, then adhesion force is achieved, but harmful factors increase due to carcinogenic and endocrine disrupting properties
Solution Approach 1:
The invention replaces harmful resorcin-formalin resin with a benign emulsion system containing liquid conjugated diene-based rubber. This substitution eliminates carcinogenic and endocrine disrupting effects while maintaining or improving adhesion force through the crosslinking mechanism.
Solution Approach 2:
The chemical composition parameters are fundamentally changed from resorcin-formalin resin to liquid conjugated diene-based rubber in emulsion form. This parameter change eliminates harmful properties while preserving the essential adhesion function through alternative chemical mechanisms.
3Strength
If organic solvent-based adhesive is used for fiber-rubber adhesion, then adhesion force is improved, but work environment burden increases
Solution Approach 1:
The invention replaces organic solvent-based adhesives with an aqueous emulsion system. This substitution eliminates harmful organic vapors and improves work environment conditions while maintaining adhesion force through the crosslinking mechanism of liquid conjugated diene-based rubber.
Solution Approach 2:
The solvent base parameter is changed from organic solvent to water-based emulsion. This parameter change eliminates work environment hazards associated with organic solvents while preserving the essential adhesion function.
4Strength
If complex adhesive formation operation is performed, then adhesion force is improved, but productivity decreases due to long treatment time
Solution Approach 1:
The liquid conjugated diene-based rubber is pre-formulated as a stable emulsion with the crosslinking agent, eliminating the need for complex on-site adhesive formation operations. This preliminary preparation enables simple application processes while maintaining strong adhesion force.
Solution Approach 2:
The adhesive system utilizes phase transition properties of the emulsion to simplify application. The emulsion can be applied in its stable liquid form and then cured through controlled phase changes, reducing the complexity and time of adhesive formation operations.
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 aqueous adhesive provides excellent adhesiveness to fibers and elastomers, reduces process contamination, and improves production efficiency by forming a stable adhesive layer that maintains adhesion over time without using harmful resorcin and formalin.
Implementation Method 1
an oil-in-water emulsion (A) containing a liquid conjugated diene-based rubber and a surfactant
Implementation Method 2
an aqueous solution or aqueous dispersion (B) of a crosslinking agent
Data Source
AI summary
An aqueous adhesive using an adhesive component that does not contain resorcin and formalin, particularly an aqueous adhesive that is excellent in adhesiveness to fibers and an elastomer and can suppress process contamination in a process of producing reinforcing fibers, reinforcing fibers using the same, and an elastomer product using the reinforcing fibers are provided. An aqueous adhesive for adhesion between fibers and an elastomer includes: an oil-in-water emulsion (A) containing a liquid conjugated diene-based rubber and a surfactant, and an aqueous solution or aqueous dispersion (B) of a crosslinking agent.