Cellulose Fiber Resin Laminate Adhesion via Intermediary Layer
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Solution Overview
Problem
Conventional laminates with ultrafine cellulose fiber-containing sheets and resin layers exhibit insufficient adhesion properties, limiting their practical applications.
Innovation Solution
A laminate configuration featuring a fiber layer with cellulose fibers of 1000 nm or less and a resin layer containing an adhesion aid, such as an isocyanate compound or organic silicon compound, which is uniformly dispersed or concentrated near the fiber layer, enhancing the adhesion between the two layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional ultrafine cellulose fiber-containing sheets are laminated with resin layers without adhesion aids, then the laminate structure is simple and manufacturing is easy, but the adhesion properties between the fiber layer and resin layer are insufficient
Solution Approach 1:
An adhesion aid layer comprising silane-modified polyethyleneoxide is introduced between the ultrafine cellulose fiber-containing sheet and the resin layer. This intermediary layer acts as a bridge that chemically bonds to both the cellulose fibers and the resin, significantly improving adhesion properties while maintaining a relatively simple laminate structure with only three layers.
Solution Approach 2:
The invention uses a composite adhesion aid system combining silane-modified polyethyleneoxide with specific resins (polycarbonate, acrylic, or polyester). The silane-modified polyethyleneoxide contains both cellulose-binding groups and resin-binding groups, creating a composite material that interfaces effectively with both the natural fiber layer and the synthetic resin layer, thereby resolving the adhesion problem.
2Reliability
If adhesion aids are added to enhance bonding between fiber and resin layers, then adhesion properties improve, but the manufacturing process and material composition become more complex
Solution Approach 1:
The adhesion aid layer is prepared in advance as a separate component (silane-modified polyethyleneoxide) that is then applied between the fiber sheet and resin layer during lamination. This preliminary preparation of the adhesion aid allows for standardized manufacturing processes and simplifies the overall production by enabling modular assembly of the laminate structure.
3Strength
If ultrafine cellulose fibers with diameter of 1000 nm or less are used, then transparency and tensile strength are significantly improved, but the challenge of achieving sufficient adhesion with resin layers increases
Solution Approach 1:
The adhesion aid (silane-modified polyethyleneoxide) is specifically localized at the interface between the ultrafine cellulose fiber layer and the resin layer. This localized application ensures that the critical bonding region has enhanced adhesion properties through chemical interactions, while the bulk properties of the ultrafine fibers (transparency and tensile strength) remain intact.
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 improved adhesion properties between the fiber and resin layers result in a laminate with increased mechanical strength, transparency, and suitability for various applications, including light transmissive substrates and electronic devices.
Implementation Method 1
the resin layer has an adhesion aid, wherein the adhesion aid is at least one selected from an isocyanate compound and an organic silicon compound
Data Source
Figure 1~2
Figure 3
Figure 4(a)~4(c)
AI summary
An object of the present invention is to provide a laminate having a fiber layer comprising ultrafine cellulose fibers and a resin layer, wherein the two layers have more excellent adhesion properties. The present invention relates to a laminate having at least one fiber layer comprising cellulose fibers with a fiber width of 1000 nm or less, and at least one resin layer that is contacted with one surface of the fiber layer, wherein the resin layer has an adhesion aid.