Cellulose Derivative Hydrogel Supports for 3D Printing
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Solution Overview
Problem
Conventional 3D printing support materials face challenges such as poor removability and generation of toxic waste, with existing methods either leaving residues or requiring hazardous chemicals for removal, which can affect the mechanical performance and sustainability of printed parts.
Innovation Solution
The use of biodegradable hydrogels made from cellulose derivatives like methylcellulose and hydroxypropyl methylcellulose, which are water-soluble and can be easily removed without generating toxic waste, providing a cost-effective solution for support structures in 3D printing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional support materials (PVA, HIPS, acrylic copolymer) are used, then support structures can be removed, but toxic waste is generated and hazardous chemicals are required
Solution Approach 1:
The patent changes the chemical composition parameters of support materials from conventional polymers (PVA, HIPS, acrylic copolymer) to cellulose derivatives with specific degrees of substitution (20-50%). This parameter change enables the support material to be water-soluble and biodegradable, eliminating toxic waste generation and hazardous chemical requirements while maintaining removability functionality
Solution Approach 2:
The patent uses composite material formulation by combining cellulose derivatives with specific molecular weight ranges and degree of substitution values to create a new class of support materials. This composite approach integrates water-solubility, biodegradability, and structural integrity, resolving the contradiction between removability and environmental sustainability
2Ease of operation
If mechanical removal with pliers is used, then support structures can be removed, but defective burrs are left on the surface and some support material remains in cavities
Solution Approach 1:
The patent replaces mechanical removal methods (pliers) with chemical dissolution using water. The cellulose derivative support materials dissolve completely in water without requiring mechanical force, eliminating surface burrs and residual material in cavities while maintaining complete removability
3Loss of substance
If heating above melting point is used to remove support material, then support material can be removed with minimum residue, but undesirable residue remains and mechanical performance is affected
Solution Approach 1:
The patent replaces thermal removal methods with water-based dissolution. The cellulose derivative support materials dissolve in water at ambient or mild temperatures, eliminating the need for high-heat processing that causes residue and mechanical degradation. This substitution achieves complete removal without affecting the mechanical performance of the printed part
4Object-affected harmful factors
If biodegradable materials like PVA are used, then environmental sustainability is improved, but hazardous chemicals are required for removal
Solution Approach 1:
The patent modifies the chemical parameters of biodegradable materials by selecting cellulose derivatives with specific degree of substitution (20-50%) and molecular weight ranges. These parameter changes enable the material to be both biodegradable and water-soluble, achieving environmental sustainability without requiring hazardous chemicals for removal
Solution Approach 2:
The patent uses water as an intermediary substance to remove support materials. Water acts as a benign mediator that dissolves the cellulose derivative support materials completely, replacing hazardous chemical bath solutions while maintaining biodegradability and environmental sustainability
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 cellulose derivative hydrogels enable easy and sustainable removal of support structures from 3D printed parts without toxic residues, improving the mechanical integrity and environmental sustainability of the printing process.
Implementation Method 1
the cellulose derivative is water-soluble
Implementation Method 2
the support material comprises a hydrogel of a cellulose derivative
Data Source
AI summary
The present disclosure relates to support structures for three dimensional (3D) printing, methods of preparing the support structures, and methods of using the support structures. In particular, the support structures comprise a hydrogel comprised of a cellulose derivative. Preferably, the support structures are biodegradable and easily removed without generating toxic waste.