PVC-Bonding Methacrylate Adhesive for Low-Temperature Elasticity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing (meth)acrylate compositions exhibit insufficient elasticity at low temperatures and often rely on volatile, odor-intensive, or reprotoxic monomers, limiting their application in structural and semi-structural bonding, especially with substrates like glass and PVC.
Innovation Solution
A two-component (meth)acrylate composition comprising specific monomers, elastomers, and additives that provide high elasticity at room temperature and low temperatures, avoiding volatile and reprotoxic monomers, with breaking elongations of at least 100% at 23°C and 50% at -20°C, and excellent adhesion to PVC.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If reactive elastomers or polyurethane polymers functionalized with (meth)acrylates are added to improve flexibility, then elasticity is improved, but the composition exhibits viscoelastic behavior and undergoes plastic deformation under load
Solution Approach 1:
The patent changes the chemical structure parameters of the elastomer by selecting specific polymers with glass transition temperatures between -50°C and -100°C, and by controlling the functional group content (0.5-5 mmol/g), thereby achieving elasticity without viscoelastic behavior and plastic deformation
Solution Approach 2:
The patent creates a composite system by combining (meth)acrylate monomers with specific elastomers and crosslinkers, where the elastomer provides elasticity while the crosslinking network maintains structural stability and prevents plastic deformation
2Stability of the object's composition
If monomers with high glass transition temperatures are used to achieve elasticity, then room temperature elastic properties are improved, but adhesion to certain substrates like glass and aluminum deteriorates
Solution Approach 1:
The patent optimizes the glass transition temperature parameter to a specific range (-50°C to -100°C) rather than using high Tg monomers, and balances this with crosslinker content (5-20 wt%) to achieve both elasticity and adhesion
Solution Approach 2:
The patent uses a composite approach combining elastomers with crosslinking agents, where the crosslinking network compensates for potential adhesion losses while maintaining elastic properties
3Ease of manufacture
If methyl methacrylate is used as the monomer to dissolve solid elastomers, then elastomer solubility is improved, but the composition exudes unpleasant odor and is highly flammable
Solution Approach 1:
The patent extracts methyl methacrylate from the monomer composition, replacing it with alternative (meth)acrylate monomers that provide the necessary solubility for elastomers without the harmful odor and flammability characteristics
Solution Approach 2:
The patent uses liquid (meth)acrylate monomers that are easier to handle and less hazardous than solid elastomers requiring MMA, achieving similar functional results with safer materials
4Strength
If existing elastic (meth)acrylate compositions are used for structural applications, then adhesion to glass and aluminum is improved, but elasticity at low temperatures below zero Celsius deteriorates
Solution Approach 1:
The patent selects elastomers with very low glass transition temperatures (-50°C to -100°C) to ensure chain mobility and elastic behavior at low temperatures, while maintaining crosslinking for adhesion 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 composition achieves high elasticity and strong adhesion to various substrates, including PVC, even at low temperatures, without using volatile or hazardous monomers, making it suitable for structural and semi-structural applications.
Implementation Method 1
the elastomer has a glass transition temperature Tg of between -50°C and -100°C, in particular between -60°C and -90°C... exhibit breaking elongations of at least 100 % at a temperature of 23°C and of at least 50 % at a temperature of -20°C
Implementation Method 2
a crosslinker... in order to form a crosslinked structure... cured composition... does not exhibit viscoelastic behavior and undergoes compressive stress without plastic deformation
Data Source
AI summary
The invention relates to a two-component (meth)acrylate adhesive composition, comprising in a first component at least one monomer, at least one elastomer with a backbone which is not a polyester, at least one elastomer with a polyester backbone, preferably additives selected from the group consisting of core-shell polymer, activator for free-radical curing, inhibitor for free-radical curing, filler and adhesion promoter and comprising in a second component at least one initiator for free-radical curing and preferably additives selected from the group consisting of plasticizer, filler, thixotropic agent and pigment. The two-component composition can be formulated to show optimal elastic properties that are suitable for structural and semi-structural applications, especially as an adhesive to PVC, and which exhibit sufficiently elastic properties even at very low temperatures down to -20°C. These compositions are preferably formulated without the use of volatile and odor-intensive (meth)acrylate monomers such as MMA or reprotoxic monomers such as GLYFOMA.