Biodegradable Adhesive Tape with Polyester-Polyurethane Crosslinking
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Solution Overview
Problem
Conventional pressure-sensitive adhesive tapes face challenges in achieving strong anchorage and biodegradability while maintaining mechanical properties, particularly in surface protection applications, where they often leave residues and have weak contact peel adhesion.
Innovation Solution
A biodegradable adhesive tape using a pressure-sensitive adhesive based on a linear polyester-polyurethane prepolymer, chemically crosslinked from aliphatic polyester polyols, diisocyanates, and specific catalysts, which develops strong anchorage forces and can be used shortly after production, allowing for easy removal without residue.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional pressure-sensitive adhesive tapes are used for surface protection, then they provide adhesive bonding, but they leave residues and have weak contact peel adhesion
Solution Approach 1:
The patent changes the chemical composition parameters of the adhesive by using a polyester-polyurethane system with specific molecular weight ranges (Mc ≥ 1000 g/mol) and controlled crosslinking density. This parameter optimization enables strong initial adhesion while maintaining clean removal properties, resolving the contradiction between reliable bonding and residue-free detachment.
Solution Approach 2:
The invention creates a composite adhesive system combining polyester and polyurethane components with specific functional groups. This composite structure provides both the anchorage strength needed for reliable bonding and the elasticity required for clean removal, simultaneously addressing contact peel adhesion and residue issues.
2Reliability
If biodegradable materials are used in adhesive tapes, then environmental compatibility improves, but mechanical properties and anchorage strength decrease
Solution Approach 1:
The patent optimizes the molecular weight parameter (Mc ≥ 1000 g/mol) and crosslinking degree of the polyester-polyurethane adhesive to achieve a balance where biodegradability is maintained through ester bond hydrolysis while mechanical strength and anchorage force are preserved through optimized polymer chain length and crosslinking density.
Solution Approach 2:
The biodegradable polyester-polyurethane adhesive is designed to hydrolyze into smaller, environmentally compatible fragments over time through ester bond cleavage. This controlled degradation allows the adhesive to maintain full functionality during use while eventually breaking down into harmless components, resolving the contradiction between strength and biodegradability.
3Productivity
If the adhesive develops strong anchorage forces quickly, then productivity improves, but the adhesive may become too rigid and lose pressure-sensitive properties
Solution Approach 1:
The patent carefully controls the crosslinking degree and molecular weight (Mc ≥ 1000 g/mol) to achieve rapid anchorage development while preserving pressure-sensitive properties. The optimized polymer structure provides fast initial bonding through strong interfacial adhesion while maintaining sufficient chain mobility for pressure-sensitive behavior, resolving the contradiction between productivity and ease of operation.
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 tape achieves strong anchorage and biodegradability, enabling easy removal from protected surfaces and maintaining mechanical properties, with the pressure-sensitive adhesive being biodegradable and suitable for various applications.
Implementation Method 1
a pressure-sensitive adhesive H comprising at least 60 wt % of at least one polyurethane P which is obtainable by chemical crosslinking of a polyurethane prepolymer
Implementation Method 2
The proportional viscous flow is necessary for the achievement of adhesion. Only the viscous components, brought about by macromolecules with relatively high mobility, permit effective wetting and flow onto the substrate where bonding is to take place.
Implementation Method 3
The proportional elastic forces of resilience are necessary for the attainment of cohesion. They are brought about, for example, by very long-chain macromolecules with a high degree of coiling, and also by physically or chemically crosslinked macromolecules, and they permit the transmission of the forces that act on an adhesive bond.
Implementation Method 4
The adhesive tape achieves strong anchorage and biodegradability, enabling easy removal from protected surfaces and maintaining mechanical properties, with the pressure-sensitive adhesive being biodegradable
Data Source
AI summary
The invention relates to an extensively biologically degradable adhesive tape, which in particular has a good and quickly established anchoring between the adhesive and the carrier. The invention relates to an adhesive tape for protecting surfaces, comprising an adhesive H, containing at least 60 wt %, at least one polyurethane P, obtainable from chemical cross-linking of a polyurethane pre-polymer, obtainable from the chemical reaction of d) one or a plurality of aliphatic polyester polyols A having a hydroxy functionality of 1.8 through 2 and a number-averaged molecular weight of equal to/greater than 1,000 g/mole; e) one or a plurality of compounds B having a hydroxy functionality of 1.8 through 2 and a number-averaged molecular weight of less than 1,000 g/mol; f) one or a plurality of aliphatic diisocyanates C; wherein the ratio of the total number of isocyanate groups to the total number of hydroxy groups of the substances involved in the chemical reaction for building the prepolymer is greater than/equal to 0.4 and less than 1; and a biodegradable carrier.