Double-Sided Adhesive Tape for Strong Bonding and Clean Removal
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Solution Overview
Problem
Existing double-sided adhesive tapes struggle with residueless and non-destructive re-release from nonwoven fabric substrates without requiring special treatments like heating, especially after long-term attachment, due to issues with adhesion strength and removability.
Innovation Solution
A double-sided adhesive tape featuring an acrylic adhesive with a low glass transition temperature and a nonwoven fabric substrate where the acrylic resin is fixed, providing strong adhesion and improved removability by enhancing the chemical affinity between the adhesive and the substrate, ensuring residueless peeling without heating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If an acrylic adhesive with strong adhesive force is used to ensure strong adhesion to substrates, then adhesion strength is improved, but removability deteriorates due to residue left on the nonwoven fabric substrate after long-term attachment
Solution Approach 1:
The patent changes the chemical composition parameters of the adhesive layer by incorporating a specific acrylic copolymer with controlled glass transition temperature (-50°C to 0°C) and functional groups. This parameter adjustment enables the adhesive to exhibit strong adhesion during use while allowing residueless removal under specific peeling conditions, resolving the contradiction between adhesion strength and removability.
Solution Approach 2:
The patent creates a composite adhesive system combining acrylic copolymer with specific monomer components (carboxyl-containing, hydroxyl-containing, or amino-containing monomers) in defined ratios. This composite formulation achieves both strong bonding to substrates like plastic and metal, and clean removal from nonwoven fabric substrates, simultaneously satisfying both adhesion strength and removability requirements.
2Ease of manufacture
If an emulsion-type adhesive using aqueous solvent is used to improve environmental compatibility, then ease of manufacture is improved, but adhesion strength deteriorates due to insufficient impregnation capacity
Solution Approach 1:
The patent modifies the adhesive composition by selecting specific acrylic copolymer characteristics (glass transition temperature between -50°C to 0°C, specific functional group content) that enhance impregnation capacity while maintaining the environmentally friendly emulsion-type aqueous formulation. This allows the adhesive to achieve both ease of manufacture and strong adhesion strength.
Solution Approach 2:
The patent formulates a composite emulsion-type acrylic adhesive incorporating copolymer components with specific functional groups (carboxyl, hydroxyl, or amino groups) in controlled proportions. This composite structure improves impregnation capacity and adhesion strength while maintaining the benefits of aqueous-based emulsion formulation for ease of manufacture.
3Strength
If a nonwoven fabric with high tensile strength is used to prevent tearing upon re-peeling, then strength is improved, but removability deteriorates due to separation of the adhesive layer from the substrate
Solution Approach 1:
The patent adjusts the glass transition temperature parameter of the acrylic copolymer in the adhesive layer to a specific range (-50°C to 0°C), which optimizes the adhesive's flexibility and bonding characteristics. This enables the adhesive to maintain strong attachment to high-tensile-strength nonwoven fabrics while allowing clean removal without layer separation, resolving the contradiction between strength and removability.
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 tape achieves strong adhesion to substrates like plastic or metal while allowing for efficient residueless peeling from nonwoven fabrics, simplifying disassembly and enhancing recycling or reuse capabilities.
Implementation Method 1
the binding between the nonwoven fabric substrate and the adhesive is stronger due to improved chemical affinity with the acrylic adhesive
Implementation Method 2
the acrylic resin having a low glass transition temperature improves the strength of the nonwoven fabric substrate to an extent that does not cause excessively great brittleness, and further, the impartment of flexibility greatly favorably contributes to the compatibility between strong adhesive force and excellent removability
Data Source
AI summary
Disclosed is a double-sided adhesive tape including a nonwoven fabric substrate and an adhesive layer composed of an acrylic adhesive composition. The nonwoven fabric substrate is obtained by fixing an acrylic copolymer having a glass transition temperature of -10°C or lower to a nonwoven fabric having a tensile strength of 5 to 45N/20 mm in both the MD direction and the TD direction. The adhesive layer has a storage modulus at a frequency of 1 Hz at 30°C of 6x104 to 1x105 Pa. This double-sided adhesive tape has strong adhesive force and excellent removability.