Acrylic-Polyolefin Laminate Adhesion Without Solvent VOCs
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Solution Overview
Problem
Existing laminates face challenges in achieving high adhesive strength without using organic solvents, particularly in laminates composed of polyolefin and acrylic resins, which have difficulty adhering to each other due to solubility parameters.
Innovation Solution
A laminate structure is developed with an adhesive layer composed of a hydrogenated conjugated diene block copolymer, having specific structural conditions, to enhance adhesion between polyolefin and acrylic resin layers, ensuring high adhesive strength without organic solvents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If solvent adhesives such as acrylic adhesives and urethane adhesives are used to address the adhesion difficulty between polyolefin and acrylic resins, then adhesive strength is improved, but VOC (volatile organic compounds) emission increases
Solution Approach 1:
The invention changes the chemical composition parameters of the adhesive layer by using a hydrogenated conjugated diene block copolymer with specific structural characteristics (vinyl aromatic monomer unit content: 25-80%, conjugated diene monomer unit content: 20-75%, specific 1,2-bond and/or 3,4-bond content: 30% or more). This parameter optimization enables effective adhesion between polyolefin and acrylic resins without requiring organic solvents, thus improving adhesive strength while eliminating VOC emission.
2Object-generated harmful factors
If an adhesive layer containing polypropylene resin as a non-solvent adhesive is used, then VOC emission is reduced, but adhesive strength is insufficient
Solution Approach 1:
The invention creates a composite adhesive material by combining a hydrogenated conjugated diene block copolymer with specific structural characteristics. This composite structure integrates the adhesion benefits of polyolefin resins with the bonding capabilities of conjugated diene polymers, achieving both low VOC emission and high adhesive strength that neither material alone can provide.
Solution Approach 2:
The invention optimizes the molecular structure parameters of the adhesive polymer by controlling the hydrogenation degree, block copolymer structure, and monomer unit composition ratios. These parameter changes transform the adhesive properties of the material, enabling it to achieve high adhesive strength without organic solvents, overcoming the limitations of simple polypropylene resin adhesives.
3Device complexity
If polyolefin resin and acrylic resin are directly laminated, then manufacturing process is simplified, but adhesion between layers is poor due to solubility parameter differences
Solution Approach 1:
The invention introduces a specifically designed hydrogenated conjugated diene block copolymer as an intermediary adhesive layer between the polyolefin resin layer and acrylic resin layer. This intermediary material has solubility parameters that bridge the gap between the two incompatible resins, enabling effective adhesion without requiring complex surface treatments or multi-step manufacturing processes.
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 laminate achieves high adhesive strength and good appearance, with improved impact resistance and compatibility between polyolefin and acrylic resin layers, while avoiding the use of organic solvents.
Implementation Method 1
an adhesive layer (III) provided between the layer mainly composed of an acrylic resin and the layer mainly composed of a polyolefin resin, wherein the adhesive layer (III) is formed from an adhesive component mainly composed of a hydrogenated conjugated diene block copolymer
Data Source
AI summary
A laminate containing: a layer (I) mainly composed of an acrylic resin; a layer (II) mainly composed of a polyolefin resin; and an adhesive layer (III) provided between the layer mainly composed of an acrylic resin and the layer mainly composed of a polyolefin resin,wherein the adhesive layer (III) is formed from an adhesive component mainly composed of a hydrogenated conjugated diene block copolymer having two or more polymer blocks selected from the group consisting of a polymer block (A) mainly composed of vinyl aromatic monomer units, a polymer block (B) mainly composed of conjugated diene monomer units, and a polymer block (C) having vinyl aromatic monomer units and conjugated diene monomer units, in which unsaturated bonds in conjugated diene monomer units are hydrogenated, andthe hydrogenated conjugated diene block copolymer satisfies predetermined requirements.