Kneadable Adhesive Element Creep Reduction
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Solution Overview
Problem
Existing kneadable pressure-sensitive adhesives face challenges with difficult removal from surfaces like woodchip wallpaper and posters, and exhibit temperature-dependent creep behavior, leading to poor removability and cohesion loss.
Innovation Solution
A combination of styrene-containing block copolymer with polyisobutylene and paraffin oil, along with specific filler ratios, enhances the adhesive element's detachment properties and reduces creep behavior, improving removability and cohesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional pressure-sensitive adhesives are used, then initial adhesion is achieved, but removability deteriorates over time
Solution Approach 1:
The patent changes the chemical composition parameters of the adhesive by incorporating specific polymers (polyisobutylene, styrene-containing block copolymer), fillers (chalk, paraffin), and oils in controlled proportions. This composition adjustment modifies the adhesive's bonding characteristics to achieve both initial adhesion and subsequent removability, resolving the contradiction between reliable bonding and ease of removal.
Solution Approach 2:
The adhesive element uses a composite material system combining multiple components: polyisobutylene (2-15 wt%), styrene-containing block copolymer (0.2-8 wt%), chalk (7-15 wt%), paraffin (60-85 wt%), and additional fillers/oils (7-20 wt%). This composite formulation creates a material that exhibits both strong initial adhesion and controlled removability, eliminating the trade-off between bonding reliability and removal ease.
2Strength
If adhesive is pressed onto support, then bonding strength is improved, but creep increases leading to penetration into microporous surfaces
Solution Approach 1:
The patent adjusts the rheological parameters of the adhesive through specific composition control. The combination of polyisobutylene, styrene-containing block copolymer, and paraffin creates a material with optimized viscosity and elasticity that resists creep while maintaining bonding strength. The filler content (7-20 wt% chalk and other fillers) further modifies the structural rigidity to prevent excessive deformation under load.
3Reliability
If adhesive adheres to microporous surfaces, then initial bonding is achieved, but removal becomes difficult or impossible
Solution Approach 1:
The patent modifies the surface interaction parameters of the adhesive through composition control. The specific polymer blend (polyisobutylene with styrene-containing block copolymer) and filler content (7-20 wt% chalk) create an adhesive that bonds to microporous surfaces without irreversible penetration. This allows the adhesive to maintain bonding reliability while enabling complete removal without residue or surface damage.
4Reliability
If adhesive is made cohesive, then bond stability is improved, but removability deteriorates
Solution Approach 1:
The patent optimizes the molecular and compositional parameters of the adhesive to achieve balanced cohesion and removability. The polyisobutylene (2-15 wt%) provides base cohesion, while the styrene-containing block copolymer (0.2-8 wt%) and paraffin (60-85 wt%) modify the cohesive strength to prevent unwanted failure during removal. This parameter optimization ensures the adhesive maintains integrity during use but releases cleanly when removed.
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 element achieves significantly improved re-detachment behavior and thermal tensile strength, allowing for residue-free and non-destructive removal from various surfaces, while maintaining kneadability and cohesion.
Implementation Method 1
kneadable pressure-sensitive adhesives
Implementation Method 2
The polyurethane is chemically cross-linked to provide the film with this elastic recovery. The adhesive bond is released by the fact that the film constricts when pulled.
Implementation Method 3
creep leads to the adhesive penetrating increasingly over time, particularly into microporous or finely structured surfaces
Data Source
Figure 1
AI summary
Kneadable adhesive element for the reversible fixing of an object to a carrier, containing at least the following components: a) at least one synthetic rubber type based on polybutene and/or polyisobutylene and/or isoprene and/or derivatives thereof; b) at least one styrene-containing block copolymer; c) paraffin oil; d) inorganic fillers.