Thermochromic Additive 3D Printing Resin for Cure Depth Control
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Solution Overview
Problem
Conventional 3D printing techniques face challenges in controlling cure depth and photodegradation of photopolymers, leading to inefficient printing processes and material instability due to static absorptivity and unreacted photosensitive species.
Innovation Solution
Incorporating thermochromic dyes into the resin precursor mixture, which modulate absorptivity with temperature, allowing dynamic control of cure depth and reducing photodegradation by varying absorptivity during and after printing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the absorptivity of the resin is increased to control cure depth, then the penetration depth of light is limited and build time increases, but if the absorptivity is decreased then cure through occurs and areas beyond target voxels gel
Solution Approach 1:
The patent applies thermochromic dyes that dynamically change the absorptivity of the resin based on temperature. During printing, the resin is heated to a temperature where the thermochromic dye has low absorptivity, allowing deep light penetration and rapid curing. After printing, the resin cools and the dye increases absorptivity to prevent photodegradation. This dynamic adjustment resolves the contradiction by enabling both fast build times and precise cure depth control at different stages.
Solution Approach 2:
The patent changes the temperature parameter of the resin to control the optical properties. By heating the resin during printing, the thermochromic dye transitions to a state with different absorptivity, allowing the system to optimize light penetration and cure depth. This parameter change enables the resin to adapt its optical characteristics to the printing stage requirements.
2Reliability
If photopolymer resins are used for rapid curing, then unreacted precursors remain and photodegradation occurs after polymerization, but if photodegradation is prevented then material stability is compromised
Solution Approach 1:
The thermochromic dye provides dynamic protection against photodegradation. During printing at elevated temperatures, the dye has low absorptivity and does not interfere with curing. After printing, as the resin cools, the dye increases absorptivity to block ambient light and prevent photodegradation of unreacted precursors. This dynamic behavior provides reliability without compromising the curing process.
Solution Approach 2:
The thermochromic dye is incorporated into the resin formulation before printing, providing built-in protection against photodegradation. The dye is pre-positioned to automatically activate its protective function when the resin cools after printing, eliminating the need for post-processing protection measures.
3Productivity
If static absorptivity is used in photopolymer resins, then cure depth is difficult to control and printing efficiency is reduced, but if dynamic absorptivity control is implemented then system complexity increases
Solution Approach 1:
The thermochromic dye provides self-regulating absorptivity control based on temperature. The resin automatically adjusts its optical properties in response to temperature changes during and after printing, without requiring external control systems or complex mechanisms. This self-service approach maintains printing efficiency while avoiding system complexity.
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
This approach enables rapid and high-resolution 3D printing with improved material stability by dynamically controlling cure depth and minimizing photodegradation through temperature-dependent absorptivity changes.
Implementation Method 1
thermochromic dyes change absorptivity with heat to selectively attenuate light transmission and control cure depth during photopolymerization
Implementation Method 2
photoirradiation penetrates the liquid resin in select regions, initiating photochemical reactions
Implementation Method 3
thermochromics can attenuate light before polymerization to extend pot life of the liquid resins
Data Source
Figure 1
Figure 2A~2B
AI summary
The disclosure provides methods and compositions for 3D printing using thermochromic additives. Thermochromic dyes change absorptivity with heat to selectively attenuate light transmission and control cure depth during 3D printing photopolymerization.