UV-Cured Methacrylate Adhesive Resolving Polymerization Inhibition
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Solution Overview
Problem
Current acrylic-based pressure-sensitive adhesive compositions face challenges in enhancing adhesion without using organic solvents, as traditional tackifiers like rosin resins inhibit ultraviolet polymerization and result in phase separation and poor cohesion.
Innovation Solution
A pressure-sensitive adhesive composition is developed using an acid-functionalized (meth)acrylate copolymer and a (meth)acrylate tackifier, which are combined with an ultraviolet photoinitiator to form a curable adhesive that can be efficiently cured by ultraviolet radiation with minimal organic solvent use, achieving high adhesion and cohesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional tackifiers (rosin resins, terpene resins, petroleum resins, aromatic resins) are added to enhance adhesion, then adhesion performance is improved, but ultraviolet polymerization is inhibited and phase separation occurs
Solution Approach 1:
The invention changes the chemical parameters of the tackifier by using (meth)acrylate functional groups instead of traditional rosin/terpene/petroleum/aromatic resins. This parameter change allows the tackifier to participate in UV polymerization through its (meth)acrylate groups while maintaining adhesion enhancement, thus resolving the contradiction between improving adhesion and ensuring complete polymerization without phase separation
Solution Approach 2:
The invention creates a composite adhesive system combining acid-functionalized (meth)acrylate copolymer with (meth)acrylate tackifier and ultraviolet photoinitiator. This composite formulation ensures compatibility between components through shared (meth)acrylate functionality, enabling simultaneous achievement of high adhesion and complete UV curing without phase separation
2Ease of manufacture
If organic solvents are used in adhesive compositions, then processing and application are facilitated, but pollution and energy consumption increase
Solution Approach 1:
The invention extracts and eliminates organic solvents from the adhesive composition by using a solvent-free system based on acid-functionalized (meth)acrylate copolymer and (meth)acrylate tackifier. This extraction removes the harmful factor (organic solvents) while maintaining the adhesive's processability through the inherent properties of the polymer-tackifier-photoinitiator system
Solution Approach 2:
The invention replaces the chemical mechanism of solvent-based adhesion with a UV photopolymerization mechanism. Instead of relying on organic solvents to facilitate processing and application, the composition uses ultraviolet radiation to initiate polymerization and curing, substituting a cleaner, more energy-efficient process that eliminates solvent-related pollution
3Object-generated harmful factors
If UV curing is used to eliminate organic solvents, then pollution and energy consumption are reduced, but traditional tackifiers inhibit the polymerization reaction
Solution Approach 1:
The invention changes the chemical parameters of the tackifier by selecting (meth)acrylate-based tackifiers with appropriate molecular weight and glass transition temperature, replacing traditional rosin/terpene/petroleum/aromatic resins. This parameter change ensures the tackifier contains (meth)acrylate functional groups that can participate in UV polymerization, thus maintaining high polymerization efficiency while eliminating pollution from organic solvents
Solution Approach 2:
The acid-functionalized (meth)acrylate copolymer acts as an intermediary that bridges the tackifier and the UV curing system. The copolymer's acid functional groups and (meth)acrylate groups facilitate compatibility and participation in the polymerization network, ensuring that the tackifier enhances adhesion without inhibiting the UV curing reaction
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 solution enables the production of pressure-sensitive adhesives with improved adhesion and cohesion, cured efficiently using UV radiation with low energy consumption and minimal organic solvents, overcoming the limitations of traditional tackifiers.
Implementation Method 1
a ultraviolet photoinitiator... cured efficiently using UV radiation
Data Source
AI summary
(Meth)acrylate pressure-sensitive adhesives,curable adhesive compositions that can be used to prepare the(meth)acrylate pressure-sensitive adhesives,and methods of making the(meth)acrylate pressure-sensitive adhesives are provided.More particularly,the(meth)acrylate pressure-sensitive adhesives contain(a)a meth(acrylate copolymer having a weight average molecular weight greater than 500,000grams/mole(Daltons)and(b)a(meth)acrylate tackifier that has a weight average molecular weight greater than20,000grams/mole(Daltons)but no greater than200,000grams/mole(Daltons).The pressure-sensitive adhesives advantageously are prepared by ultraviolet(UV)curing a curable adhesive composition that contains minimal or no organic solvents.