Polymer Composition for Stereolithography Viscosity Control
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Solution Overview
Problem
Current stereolithography techniques face challenges in producing elastic molded products with low temperature dependency and small compression set, as existing polymer compositions often have high viscosity, making it difficult to form layers and maintain productivity and structural integrity.
Innovation Solution
A polymer composition for stereolithography is developed, comprising a liquid polymer with (meth)acryloyl groups, a monomer, and at least two photopolymerization initiators with different absorption bands, ensuring a viscosity of 3,000 mPa·s or less at room temperature, which allows for effective layer formation and curing, resulting in elastic molded products with improved mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a polymer composition is used for stereolithography, then elastic molded products can be produced, but the viscosity is often too high to form layers properly
Solution Approach 1:
The patent modifies the chemical composition parameters of the polymer system by selecting specific liquid rubbers with appropriate molecular weights and functional groups, combining them in optimized ratios to achieve the target viscosity range of 50-3000 mPa·s while maintaining elastic properties
Solution Approach 2:
The invention creates a composite photopolymerizable composition by combining liquid rubber (providing elasticity), photopolymerizable monomer (enabling curing), and photopolymerization initiator (facilitating polymerization), where each component contributes specific properties to achieve both low viscosity and elastic molded product quality
2Productivity
If the viscosity is reduced to enable layer formation, then productivity improves, but the structural integrity of the elastic molded product may deteriorate
Solution Approach 1:
The patent optimizes the molecular weight parameter of the liquid rubber within the range of 1000-100000, and adjusts the functional group content (vinyl, acryloyl, or methacryloyl groups) to balance flow properties for high productivity while ensuring adequate crosslinking density for structural integrity in the cured state
Solution Approach 2:
The composite system combines liquid rubber molecules with photopolymerizable functional groups, allowing the material to exhibit low viscosity in the uncured state for easy layer formation, then transform into a structurally intact elastic network upon photopolymerization curing
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 polymer composition enables the production of elastic molded products with suitable viscosity for stereolithography, achieving Shore A hardness, tensile strength, and low compression set, enhancing the mechanical properties and productivity of the manufacturing process.
Implementation Method 1
a polymer composition containing a liquid polymer, a monomer, and at least two photopolymerization initiators different in absorption band
Implementation Method 2
at least two photopolymerization initiators different in absorption band
Data Source
AI summary
An object of the present invention is to provide a novel polymer composition for stereolithography that is capable of suitably providing an elastic molded product by stereolithography. A polymer composition for stereolithography containing a liquid polymer and a monomer, the polymer composition for stereolithography having a viscosity of 3,000 mPa·s or less, the viscosity being measured in an environment of a temperature of 25°C and a relative humidity of 50% using an E-type viscometer under conditions of a cone plate diameter ϕ of 25 mm and a shear rate of 100 sec-1.