Acrylic Adhesive Composition for Polyolefin Bonding
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Solution Overview
Problem
Two-part acrylic adhesives exhibit low adhesiveness to polyolefins, requiring surface treatments that often fail to achieve sufficient adhesion, and existing compositions with organoboron compounds do not demonstrate adhesion to polyolefins.
Innovation Solution
A composition comprising specific ratios of (meth)acrylates with hydroxyl, alkyl, and cyclic ether groups, combined with an alkylborane-amine complex and a phosphate, which are divided into a first and second agent for improved adhesion to polyolefins, cycloolefins, and fiber-reinforced plastics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If surface treatment (flame treatment, ITRO treatment, corona discharge, plasma treatment, oxidation, or sputter etching) is applied to polyolefins, then adhesiveness is improved, but process complexity and cost increase
Solution Approach 1:
The patent uses a silane coupling agent as an intermediary substance that chemically bonds to both the polyolefin substrate and the acrylic adhesive. The silane coupling agent contains reactive groups that interact with the polyolefin surface and crosslinkable groups that form strong bonds with the adhesive, creating a molecular bridge that eliminates the need for complex surface treatments
Solution Approach 2:
The patent modifies the chemical parameters of the adhesive system by incorporating specific ratios of functional monomers (carboxylic acid group-containing, hydroxyl group-containing, and epoxy group-containing monomers) and silane coupling agents. This chemical parameter modification enables direct bonding to polyolefins without physical surface treatment
2Strength
If primer coating is applied to poor adherends, then adhesiveness is improved, but additional processing steps and time are required
Solution Approach 1:
The patent merges the adhesive formulation with bonding-enhancing functional components (silane coupling agents and specific functional monomers) to create a unified composition that provides both adhesion and bonding enhancement in a single application step, eliminating the separate primer coating step
Solution Approach 2:
The acrylic adhesive composition is designed to perform multiple functions simultaneously: it provides structural adhesion, chemical bonding to polyolefins, and crosslinking for enhanced strength, replacing the traditional multi-step process of surface treatment plus primer plus adhesive
3Speed
If two-part acrylic adhesive is used, then curing speed and adhesion are improved, but adhesiveness to polyolefins remains low
Solution Approach 1:
The patent creates a composite adhesive system combining acrylic polymers with silane coupling agents and functional monomers. This composite formulation integrates the fast-curing properties of acrylics with the polyolefin-bonding capabilities of silanes and the crosslinking benefits of epoxy and carboxylic acid groups, achieving both rapid curing and strong adhesion to polyolefins
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 adhesiveness to polyolefins and polyolefin-containing fiber-reinforced plastics, with improved workability and curing characteristics, allowing for effective bonding without the need for extensive surface treatments.
Implementation Method 1
an organoboron compound
Implementation Method 2
a (meth)acrylate having a hydroxyl group, an alkyl (meth)acrylate, and a (meth)acrylate having a cyclic ether skeleton
Implementation Method 3
a (meth)acrylate having a hydroxyl group
Implementation Method 4
a (meth)acrylate having a cyclic ether skeleton
Data Source
AI summary
A composition having excellent adhesiveness to poorly adhesive materials such as polyolefins is provided. The solution is a composition comprising the following (1) to (2): (1) (meth)acrylates containing the following (1-1) to (1-3): (1-1) a (meth)acrylate having a hydroxyl group, (1-2) an alkyl (meth)acrylate, and (1-3) a (meth)acrylate having a cyclic ether skeleton, and (2) an organoboron compound. The content ratio of (1-1), (1-2), and (1-3) is (1-1):(1-2):(1-3)=(10 to 90):(5 to 80):(5 to 80) in mass ratio in 100 parts by mass of (1) (meth)acrylates.