PPS Laminate Adhesive Composition for Short-Seal Bonding
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Solution Overview
Problem
Existing laminates of polyphenylene sulfide (PPS) with adhesive layers suffer from poor adhesion due to low reactivity between functional groups, limiting their use in applications requiring high adhesive strength, especially in processes with short sealing times.
Innovation Solution
A laminate comprising a layer of polyphenylene sulfide (PPS) and an adhesive layer containing a graft-modified product of polyolefins by a carbodiimide monomer with a carbodiimide group and polymerizable double bond, within specific density and carbodiimide group content ranges, is used in co-extrusion, laminate molding, or co-injection molding to enhance adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional adhesive compositions are used with PPS, then the laminate can be manufactured, but the adhesive strength between layers is poor due to low reactivity of functional groups
Solution Approach 1:
The invention changes the chemical parameters of the adhesive composition by incorporating carbodiimide groups (0.1-50 mmol per 100g) which have high reactivity with PPS functional groups. This parameter change transforms the adhesive from having poor reactivity to exhibiting excellent adhesion to PPS layers, directly resolving the technical contradiction between manufacturability and adhesion quality.
Solution Approach 2:
The adhesive composition is formulated as a composite material containing graft-modified polyolefin with carbodiimide groups combined with other adhesive components. This composite structure leverages the reactivity of carbodiimide groups with PPS while maintaining the beneficial properties of polyolefin, achieving both manufacturability and high adhesive strength.
2Productivity
If conventional laminating methods are used, then the laminate can be formed, but sealing time must be long which limits productivity
Solution Approach 1:
The carbodiimide groups in the adhesive composition enable rapid chemical reaction with PPS functional groups at elevated temperatures, dramatically reducing the sealing time required to achieve adequate adhesion. This parameter change in reaction kinetics allows short sealing times while maintaining high adhesive strength, resolving the contradiction between productivity and adhesion quality.
3Adaptability or versatility
If PPS is laminated with different resins using conventional adhesives, then the laminate structure can be achieved, but adhesion is limited due to poor reactivity between functional groups
Solution Approach 1:
The carbodiimide-modified adhesive acts as a chemical intermediary between PPS and other resin layers. The carbodiimide groups specifically react with PPS functional groups to form strong bonds, while the polyolefin backbone provides compatibility with other non-polar resin layers, enabling versatile laminate construction with high interlayer adhesion.
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 excellent adhesive strength between PPS and the adhesive layer even with short sealing times, maintaining interlayer adhesion under high temperatures, and can be formed in various shapes and materials.
Implementation Method 1
a graft-modified product of at least one base polymer selected from polyolefins by a carbodiimide monomer having a carbodiimide group and a polymerizable double bond is contained
Data Source
AI summary
One embodiment of the present invention relates to a laminate or a method for manufacturing a laminate, the laminate has a layer (A) including polyphenylene sulfide and an adhesive layer (B) including an adhesive composition, at least a part of the adhesive layer (B) being in contact with the layer (A), the adhesive composition contains a graft-modified product of at least one base polymer selected from polyolefins by a carbodiimide monomer having a carbodiimide group and a polymerizable double bond and contains 0.1 to 50 mmol of the carbodiimide group per 100 g of the adhesive composition, and the density of the adhesive composition is 0.870 to 0.940 g/cm3.