Ester-Based Wash Composition for 3D Printed Parts
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Solution Overview
Problem
Existing methods for washing 3D printed parts made from photocurable resins often result in incomplete curing, residual resin on the surface, and compromised surface finishes, leading to inefficiencies and increased costs due to the need for frequent bath changes.
Innovation Solution
A composition comprising alkylene glycols, alkylene glycol ethers, alkoxylated aromatic alcohols, and an antioxidant component is used to effectively wash 3D printed parts, removing residual photocurable resin and improving surface finish without negatively impacting the shelf life of the wash bath.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional wash liquids (isopropanol, BIO-SOLV, PURPLE POWER, SIMPLE GREEN) are used to wash 3D printed parts, then residual photocurable resin is removed from the surface, but the wash bath reaches gel consistency over time requiring frequent changing
Solution Approach 1:
The patent changes the chemical composition parameters of the wash liquid by using esters (isopentyl acetate, ethyl acetate, butyl acetate) instead of conventional solvents like isopropanol. This parameter change prevents the wash bath from reaching gel consistency, extending its usable life while maintaining effective resin removal and surface finish quality.
Solution Approach 2:
The patent employs a composite wash liquid formulation containing multiple ester components (isopentyl acetate, ethyl acetate, butyl acetate) in specific proportions. This composite approach creates a synergistic effect that prevents gel formation while effectively removing residual resin, solving both the surface quality and bath longevity issues.
2Object-generated harmful factors
If conventional wash liquids are used to remove residual resin, then surface tackiness is reduced, but VOC emissions increase and flash points decrease
Solution Approach 1:
The patent changes the physical and chemical parameters of the wash liquid by selecting esters with higher flash points (isopentyl acetate: 32°C, butyl acetate: 31°C) compared to conventional isopropanol (-12°C). This parameter change reduces fire hazards and VOC emissions while maintaining the ability to remove surface tackiness from residual resin.
Solution Approach 2:
The patent uses commonly available ester solvents that are less hazardous and can be handled more safely, reducing the need for expensive safety infrastructure and ventilation systems while effectively addressing surface tackiness issues.
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 proposed method efficiently removes residual resin from 3D printed parts, resulting in a cleaner surface finish and extending the useful life of the wash bath by using components with higher flash points and reduced VOC emissions.
Implementation Method 1
A composition comprising: (a) one or more alkylene glycols; (b) one or more alkylene glycol ethers; (c) one or more alkoxylated aromatic alcohols; and (d) an antioxidant component
Data Source
AI summary
Provided herein are methods for making 3D printed parts by additive manufacturing using post processing cleaners.