Aqueous Rubber Adhesive with Solvent-Induced Swelling
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Solution Overview
Problem
Existing solvent-based adhesives for rubber products pose environmental and health hazards due to high volatile organic compound (VOC) emissions, and aqueous adhesives lack sufficient adhesive strength, leading to adhesion failures.
Innovation Solution
An aqueous adhesive comprising rubber latex as the main component and an organic solvent that causes swelling of the rubber component, with specific solvent and solid content concentrations, improves affinity and adhesive strength through vulcanization reaction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a solvent-based adhesive is used to achieve sufficient adhesive strength, then adhesive strength is improved, but VOC emissions and environmental harm increase
Solution Approach 1:
The invention changes the solvent system from organic to aqueous, fundamentally altering the chemical composition parameters. The adhesive uses water as the primary solvent instead of organic solvents like naphtha, thereby eliminating VOC emissions while maintaining adhesive functionality through the aqueous-based rubber latex formulation
Solution Approach 2:
The invention creates a composite adhesive system combining rubber latex, aqueous solution, and specific additives (vulcanization accelerator, filler, plasticizer) to achieve the necessary adhesive properties. This composite formulation replaces the simple organic solvent-based system while maintaining or improving adhesive performance without the harmful emissions
2Object-generated harmful factors
If an aqueous adhesive is used to reduce VOC emissions, then environmental harm is reduced, but adhesive strength becomes insufficient
Solution Approach 1:
The invention adjusts critical parameters of the aqueous adhesive including solid content concentration (30-70%), pH value (7-12), and additive ratios to optimize adhesive performance. These parameter optimizations ensure that the aqueous adhesive achieves sufficient bonding strength for rubber-to-rubber applications
Solution Approach 2:
The invention introduces specific intermediary substances including vulcanization accelerators (e.g., CBS, MBT) and fillers that facilitate the bonding process between rubber surfaces. These intermediaries enable the aqueous adhesive to achieve adequate adhesion strength by promoting cross-linking and bonding reactions at the interface
3Strength
If the solid content concentration in the base agent is increased to improve adhesive strength, then adhesive strength is improved, but viscosity increases making application difficult
Solution Approach 1:
The invention optimizes the solid content concentration within the specific range of 30-70%, balancing adhesive strength and application properties. This parameter optimization ensures the adhesive has sufficient solids for strong bonding while maintaining manageable viscosity for practical application
Solution Approach 2:
The invention uses plasticizers as intermediary substances to modify the rheological properties of the adhesive. These plasticizers reduce viscosity and improve flow characteristics, making the adhesive easier to apply while the high solid content provides the necessary bonding strength
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 adhesive achieves stable and strong bonding between rubber materials with reduced VOC emissions, minimizing environmental and health risks while maintaining effective adhesion.
Implementation Method 1
an organic solvent that causes swelling of a rubber component in the rubber latex
Implementation Method 2
improves affinity and adhesive strength through vulcanization reaction
Data Source
Figure 1
Figure 2A~2B
AI summary
An aqueous adhesive for rubber of the present disclosure includes: a base agent containing rubber latex as a main component thereof; and an organic solvent that causes swelling of a rubber component in the rubber latex. An amount of the organic solvent in the aqueous adhesive for rubber is not less than 25% by mass and not greater than 60% by mass of a total amount of the base agent and the organic solvent. A boiling point of the organic solvent is preferably not higher than 140°C. A tennis ball of the present disclosure includes a hollow core made of a rubber material. The hollow core includes two hemispherical half cores. The two half cores are adhered to each other by using the aqueous adhesive for rubber.