Multistage Core-Shell Acrylic Adhesive Dispersion
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Solution Overview
Problem
Standard acrylic structural adhesives have low elongation at break and adhesion, and achieving homogeneous distribution of core-shell impact modifiers is challenging, which affects their impact performance and shear strength.
Innovation Solution
A multistage polymer composition with a core-shell structure, easily dispersible in liquid and/or reactive resins, is used in conjunction with a (meth)acrylic polymer to create a structural adhesive with improved tensile strength, elongation at break, and adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If core-shell impact modifiers are added to improve impact performance, then impact strength is improved, but homogeneous distribution throughout the adhesive is difficult to achieve
Solution Approach 1:
The core-shell impact modifier is segmented into discrete particles with a specific structure: a polybutadiene core providing impact resistance and a polymethyl methacrylate shell providing compatibility and dispersion. This segmentation allows the impact modifier to be distributed as individual particles throughout the adhesive matrix, achieving homogeneous distribution while maintaining impact strength.
Solution Approach 2:
Different regions of the impact modifier particle have different properties: the soft polybutadiene core provides impact absorption, while the hard polymethyl methacrylate shell provides structural integrity and compatibility with the acrylic adhesive matrix. This local quality differentiation enables both homogeneous distribution and effective impact performance.
2Strength
If standard acrylic structural adhesives are used to achieve high tensile shear strength, then tensile strength is improved, but elongation at break remains relatively low
Solution Approach 1:
The adhesive formulation combines the acrylic polymer matrix (providing tensile shear strength) with core-shell impact modifiers (providing elongation and toughness). This composite material approach allows the adhesive to simultaneously achieve high tensile shear strength and improved elongation at break, as the rubbery core-shell particles act as stress concentrators and energy absorbers during deformation.
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 increased elongation at break and shear strength adhesion, while maintaining high tensile strength and impact performance, thereby enhancing the overall performance of the structural adhesive.
Implementation Method 1
a second part composition (P2) comprising a polymerization initiator
Data Source
AI summary
The present invention relates to a composition suitable as (meth)acrylic adhesive composition comprising a multistage polymer in form of polymeric particles and a (meth)acrylic polymer, its process of preparation, and its use. In particular the present invention relates to a structural (meth)acrylic adhesive composition comprising a multistage polymer in form of polymeric particles made by a multistage process and a (meth)acrylic polymer, its process of preparation and its use. More particularly the present invention relates to structural (meth)acrylic adhesive composition made from a two part composition comprising a multistage polymer in form of polymeric particles made by a multistage process and a (meth)acrylic polymer, its process of preparation, and its use.