Hydroxypropyl Methylcellulose Support for 3D Printing
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Solution Overview
Problem
Existing three-dimensional printing technologies face challenges in removing support materials without damaging the build material, as current methods often leave undesirable residues or compromise the mechanical integrity of the finished part, and existing support materials are either difficult to print with, toxic, or do not adhere well to the build material.
Innovation Solution
The use of hydroxypropyl methylcellulose with a degree of substitution (DS) of at least 1.0 and molar substitution (MS) of at least 0.6 as a support material, which can be easily removed with water, leaving a non-toxic and non-corrosive residue, and provides good adhesion to the build material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If heating and organic carrier are used to remove support material, then support material can be removed, but mechanical integrity of build material is compromised and oily residue is deposited
Solution Approach 1:
The invention changes the chemical parameter of the support material from requiring thermal-chemical removal (heating + organic carrier) to water-soluble removal. By selecting support materials with specific water solubility characteristics, the removal process can be performed at ambient temperature using water, eliminating the need for heating and organic carriers that damage the build material.
Solution Approach 2:
The invention employs disposable support materials that are intentionally designed to be easily removable and replaceable. These support structures serve their temporary function during printing and are then discarded through simple water washing, eliminating the need for complex removal processes that could harm the permanent build material.
2Ease of operation
If release material coating is applied between build material and support material, then support material removal is facilitated, but oily residue is deposited and process complexity increases
Solution Approach 1:
The invention uses water as an intermediary substance to remove support material. Instead of applying complex release coatings, water acts as a universal mediator that selectively dissolves the water-soluble support material without affecting the build material, providing both ease of removal and process simplicity.
Solution Approach 2:
The invention achieves homogeneous water solubility in the support material, allowing uniform removal throughout the entire support structure. This homogeneity in chemical property (water solubility) ensures consistent and complete removal without requiring additional release agents or coatings.
3Loss of substance
If limonene is used to dissolve HIPS support material, then support material can be removed, but low flash point safety issues and undesirable wastes are created
Solution Approach 1:
The invention changes the solvent parameter from organic solvents like limonene (with low flash point and environmental concerns) to water. This parameter change in the removal medium eliminates safety hazards associated with flammable organic solvents and avoids creating undesirable environmental waste.
Solution Approach 2:
The invention converts the potential harm of using strong organic solvents into a benefit by selecting water-soluble support materials that can be removed with benign water. The support materials are designed to be inherently removable by water, turning a safety risk into a safe and environmentally friendly process.
4Loss of substance
If PVA is used as support material for ABS, then water-soluble removal is achieved, but adhesion to build material is insufficient and printing difficulty increases
Solution Approach 1:
The invention employs composite support materials that combine water solubility with good adhesion properties. Rather than using pure PVA which lacks adhesion, the support material is formulated as a composite or modified polymer that maintains water solubility for easy removal while incorporating adhesion-promoting characteristics for reliable bonding to the build material.
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
Hydroxypropyl methylcellulose effectively supports three-dimensional printing by allowing easy removal without damaging the build material, leaving non-toxic residues, and ensuring good adhesion, thus enhancing the mechanical integrity and print quality.
Implementation Method 1
the support material can be easily removed with water
Data Source
AI summary
A three-dimensionally printed article comprises a build material and a support material, the support material comprising a hydroxypropyl methylcellulose having a DS of at least 1.0 and an MS of at least 0.6, wherein DS is the degree of substitution of methoxyl groups and MS is the molar substitution of hydroxypropoxyl groups. The support material can be removed from the build material by contacting the support material with water.