Eco-Friendly Aqueous Adhesive for Vehicle Interiors
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Solution Overview
Problem
Conventional vehicle interior plastic components lack desirable texture and scratch resistance, and the use of oil-based adhesives generates VOCs and environmental pollution, while waterborne polyurethane adhesives struggle with curing and molecular weight control, leading to suboptimal film properties.
Innovation Solution
A highly elastic aqueous adhesive composition is developed by combining a water-dilutable polyurethane resin with a hydroxyl group and a waterborne polyurethane resin, along with additional components like hardeners, pigments, and stabilizers, to enhance elastic recoverability and scratch resistance while reducing VOC generation and production costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If oil-based adhesive is used to cover fabric on molded articles, then adhesive strength and bonding performance are improved, but VOC generation increases causing environmental pollution and health issues
Solution Approach 1:
The patent changes the chemical composition parameters of the adhesive by using waterborne polyurethane resin instead of oil-based adhesive. This substitution maintains the necessary adhesive strength while eliminating organic solvents that generate VOCs, thereby resolving the contradiction between bonding performance and environmental harm.
Solution Approach 2:
The patent creates a composite adhesive system by combining waterborne polyurethane resin with specific additives and modifiers. This composite formulation achieves the required adhesive strength and elastic properties without relying on harmful organic solvents, thus reducing VOC generation while maintaining bonding performance.
2Object-generated harmful factors
If waterborne polyurethane is used as adhesive, then VOC generation is reduced, but molecular weight control and curing reaction are difficult leading to soft film properties
Solution Approach 1:
The patent precisely controls the molecular weight parameters of the waterborne polyurethane resin within specific ranges (10,000-50,000 g/mol) and adjusts the NCO/OH ratio to optimize curing. This parameter control ensures the film achieves appropriate hardness and elastic recovery without remaining soft, while maintaining the environmental benefits of water-based formulation.
Solution Approach 2:
The patent performs preliminary optimization of the polyurethane resin synthesis before application, pre-establishing the molecular weight and functional group content. This preliminary action ensures that the adhesive composition is properly formulated to achieve both good film properties and elastic recovery, avoiding the soft film problem associated with conventional waterborne polyurethanes.
3Ease of operation
If conventional waterborne polyurethane is used, then adhesive application is simplified, but elastic recoverability and scratch resistance are insufficient
Solution Approach 1:
The patent formulates a composite adhesive composition that combines waterborne polyurethane resin with specific modifiers and additives. This composite structure maintains the ease of water-based application while significantly enhancing scratch resistance and elastic recoverability through the synergistic effects of the combined components.
Solution Approach 2:
The patent adjusts key parameters including the molecular weight of polyurethane resin (10,000-50,000 g/mol), NCO content (1-5%), and OH content (2-10%), to optimize both application properties and mechanical performance. These parameter adjustments ensure easy application while achieving superior elastic recovery and scratch resistance.
4Area of stationary object
If fabric is tightly pulled to cover molded articles, then surface coverage is improved, but production cost increases due to expensive fabric material
Solution Approach 1:
The patent replaces expensive fabric materials with a cost-effective adhesive coating solution. By applying the adhesive composition directly to the molded article surface, the invention achieves complete surface coverage without the need for costly fabric materials, thereby significantly reducing production costs while maintaining aesthetic and functional coverage.
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 composition provides an eco-friendly solution with improved texture, scratch resistance, and reduced VOC emissions, achieving superior elastic recoverability and cost-effectiveness for vehicle interior materials, while maintaining conventional properties.
Implementation Method 1
adding a water-dilutable polyurethane resin having a hydroxyl group to a waterborne polyurethane resin
Implementation Method 2
water-dilutable polyurethane resin having a hydroxyl group
Data Source
AI summary
Disclosed are a adhesive composition and a method of surface-treating a molded article using the same. In particular, the adhesive composition may be eco-friendly because smell and VOC generation from the organic solvent are reduced by adding a water-dilutable polyurethane resin having a hydroxyl group to a waterborne polyurethane resin, thereby improving properties such as elastic recoverability and scratch resistance while satisfying conventional properties.