Two-Layer Thermoplastic Composite Using Deinking Sludge
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Solution Overview
Problem
Natural fiber plastic composite products face challenges in utilizing deinking sludge as a filler and reinforcement material due to its ink content affecting the product's appearance and requiring high temperatures for processing, which limits the use of thermoplastic polymers with high melting temperatures.
Innovation Solution
Incorporating deinking sludge with cellulose fibers and minerals into thermoplastic polymer composites, allowing for high temperatures in processing and enabling the use of thermoplastic polymers with high melting temperatures, while also addressing the ink content through layering or foaming to achieve durable and lightweight products.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If deinking sludge is used as filler and reinforcement material, then waste reduction and cost-effectiveness are improved, but the ink content affects the appearance of the final product
Solution Approach 1:
The product is divided into multiple layers, with the first layer (visible surface) comprising thermoplastic polymer and cellulose-based particles for good appearance, and the second layer (internal structure) comprising thermoplastic polymer and deinking sludge for waste utilization and reinforcement. This segmentation allows each layer to fulfill its specific function without compromising the other.
Solution Approach 2:
Different regions of the composite product have different compositions optimized for their specific functions: the surface layer has high cellulose-based particles for aesthetic quality, while the internal layer has high deinking sludge content for structural reinforcement and waste reduction. This local quality differentiation resolves the contradiction between appearance and waste utilization.
2Loss of substance
If deinking sludge is used in composite material, then waste utilization is improved, but higher temperatures are required for processing which limits the use of thermoplastic polymers with high melting temperatures
Solution Approach 1:
The composite is segmented into two layers with different thermal requirements. The first layer uses thermoplastic polymer with lower melting temperature suitable for standard processing, while the second layer with deinking sludge can be processed at higher temperatures to enable the use of high-melting-point thermoplastic polymers like polyamide or polyethylene terephthalate, thereby expanding material choices without compromising waste utilization.
3Loss of substance
If deinking sludge with lower fiber content is used, then waste reduction is improved, but higher temperatures must be used in preparation which enables use of thermoplastic polymers with high melting temperature
Solution Approach 1:
The two-layer structure allows independent optimization of each layer. The second layer can utilize high-melting-point thermoplastic polymers (such as polyamide with melting point above 200°C or polyethylene terephthalate) processed at higher temperatures, while the first layer uses standard thermoplastic polymers for easier processing. This segmentation restores adaptability in polymer selection despite the lower fiber content of deinking sludge.
4Loss of substance
If high amount of deinking sludge is incorporated into composite material, then waste reduction and cost-effectiveness are improved, but the melt strength of the product decreases making foaming challenging
Solution Approach 1:
The composite is segmented into two layers where the second layer contains high amounts of deinking sludge (up to 80% by weight) optimized for waste reduction and cost-effectiveness, while the first layer comprises thermoplastic polymer and cellulose-based particles providing structural integrity and good melt strength. This segmentation allows high sludge content without compromising overall product quality.
Solution Approach 2:
The invention creates a composite-of-composites: a two-layer structure where the second layer is a composite of thermoplastic polymer and deinking sludge, and the first layer is a composite of thermoplastic polymer and cellulose-based particles. This multi-composite structure enables the benefits of high sludge content while maintaining adequate melt strength through the first layer's composition.
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 method allows for the effective use of deinking sludge in composite products, reducing waste and energy consumption, achieving high-quality products with increased stiffness, dimensional stability, and reduced weight and cost, while masking the ink's appearance in multi-layered products.
Implementation Method 1
heating the mixture to melt the thermoplastic polymer
Implementation Method 2
When foaming the polymer containing recycled sludge, high melt strength of the product was obtained
Data Source
AI summary
The present application relates to a natural fiber plastic composite product comprising thermoplastic polymer and dried deinking sludge containing cellulose fibers and minerals in foamed form. The present application also relates to a method for preparing the natural fiber plastic composite product.