Cellulose Fiber Thermoplastic Alloy Low-Temperature Processing
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Solution Overview
Problem
Existing methods for producing natural fiber thermoplastic compositions face challenges such as degradation, brittleness, and difficulty in achieving high strength and gloss surfaces without degrading fibers, especially when combined with high heat polymers, and often result in brown-colored products unsuitable for cosmetic or medical applications.
Innovation Solution
A method involving a two-ingredient composition of a thermoplastic alloy and cellulose fibers, where the thermoplastic alloy includes a high heat polymer like polyamide or polyester, and the cellulose fibers are processed at low temperatures to minimize degradation, allowing for the production of bright, glossy parts with improved mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If high heat polymers like polyamide are combined with cellulose fiber in traditional extrusion processes, then the composition achieves high strength, but the cellulose fiber degrades and produces brown color
Solution Approach 1:
The patent divides the processing into two separate stages: first creating a thermoplastic alloy matrix containing the high heat polymer, then separately incorporating the cellulose fiber into this pre-formed matrix. This segmentation prevents the cellulose from being exposed to the high shear and high temperature conditions that cause degradation during traditional co-extrusion.
Solution Approach 2:
The thermoplastic alloy matrix is prepared in advance before the cellulose fiber is added. By pre-forming the polymer matrix with controlled properties, the patent ensures that when cellulose is incorporated, it doesn't undergo the harmful high-temperature shear that would otherwise occur during simultaneous processing of all components.
2Stability of the object's composition
If traditional coupling agents are used to combine polyolefins, polyamides, and cellulose fiber, then the composition achieves good dispersion, but skin irritant issues arise for cosmetic and medical markets
Solution Approach 1:
The patent removes the problematic coupling agent from the formulation entirely. Instead of using traditional coupling agents that cause skin irritation, the invention relies on the physical and chemical properties of the thermoplastic alloy matrix itself to provide compatible dispersion of cellulose fiber without requiring harmful intermediary substances.
Solution Approach 2:
The patent changes the fundamental parameters of the polymer matrix by creating a thermoplastic alloy with specific composition ratios and molecular characteristics that inherently provide good fiber dispersion. This parameter change eliminates the need for coupling agents while maintaining or improving dispersion quality.
3Stability of the object's composition
If high shear extrusion processes are used to blend cellulose fiber with thermoplastics, then the composition achieves uniform mixing, but excessive heat damage occurs to additives and ingredients
Solution Approach 1:
The patent segments the mixing process into two distinct phases: first blending the thermoplastic polymers to form an alloy matrix, then separately incorporating the cellulose fiber into this pre-formed matrix at lower temperatures. This prevents additives from being exposed to excessive heat and shear during the initial high-intensity mixing phase.
Solution Approach 2:
The thermoplastic alloy matrix serves as an intermediary medium that facilitates the incorporation of cellulose fiber without requiring direct high-shear contact between all components. The pre-formed matrix acts as a protective buffer that reduces thermal and mechanical stress on sensitive additives during fiber incorporation.
4Ease of operation
If cellulose fiber is processed at high temperatures to achieve good flowability, then the composition is easier to mold, but fiber degradation increases significantly
Solution Approach 1:
The patent changes the temperature parameter at which cellulose fiber is processed, incorporating it into the thermoplastic alloy at lower temperatures than traditional methods. This parameter change maintains adequate flowability for molding while preserving fiber integrity and preventing degradation.
Solution Approach 2:
The patent creates a composite material system where the thermoplastic alloy matrix and cellulose fiber are combined in a way that leverages the strengths of each component. The polymer matrix provides flowability and ease of processing, while the cellulose fiber contributes strength and stiffness, with the interface between them optimized to minimize degradation.
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 produces cellulose thermoplastic alloy compositions with enhanced tensile strength, heat stability, and the ability to create bright, glossy parts that meet FDA compliance, suitable for medical devices and other applications requiring high performance and cosmetic quality.
Implementation Method 1
the cellulose fibers are processed at low temperatures to minimize degradation
Implementation Method 2
melt blended with a preferred organic compound having moderate shear and low temperature
Implementation Method 3
The thermoplastic alloy is produced by a high shear extrusion process
Implementation Method 4
a melt blending process will heat the ingredients at temperatures below 410 F to produce a compressed pellet
Implementation Method 5
These two ingredients are extruded at low temperatures below 410 F, whereby additional additives or polymers can be included to increase the adhesion or flowability of the fibers
Implementation Method 6
The inventor observed an improved pellet construction, whereby a compressed pellet was produced in the pelletizing process
Data Source
AI summary
A inventive method to process an organic compound with a thermoplastic alloy composition comprising of a high heat hydrophilic polymer, a polyolefin, preferably with a compatibilizer that is without maleic content. A compressed pellet will be generated at low temperatures for producing a cellulose thermoplastic alloy composition improving the ability to color and replace existing compositions that are challenged by toxicity and performance. This composition can be re fractured into fine particles if necessary, to produce 3 D printed parts well beyond the degradation of the specified organic compound for cosmetic, automotive or medical markets.