Modified Polyvinyl Alcohol Resin for Flexible 3D Modeling Powders
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Solution Overview
Problem
Conventional 3D modeling powders using non-modified polyvinyl alcohol result in 3D objects with high crystallinity and hardness but poor flexibility, leading to breakage under bending stress due to their high level of crystallinity and low flexibility.
Innovation Solution
The use of diacetone acrylamide-modified polyvinyl alcohol with a specific functional group, which reduces crystallinity and increases hydrophilicity, along with a cross-linking agent, to enhance the strength of 3D objects by forming cross-linking structures between resin molecules.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If non-modified polyvinyl alcohol is used as the resin, then the 3D object achieves high crystallinity and hardness, but it results in poor flexibility and breakage under bending stress
Solution Approach 1:
The patent modifies the polyvinyl alcohol resin by introducing acrylamide groups at specific positions (terminal, side chain, or backbone) to change its physical and chemical parameters. This modification reduces crystallinity while maintaining adequate hardness, thereby improving flexibility and preventing breakage under bending stress during sintering processes.
Solution Approach 2:
The invention creates a composite resin structure by combining modified polyvinyl alcohol with acrylamide functional groups. This composite approach allows the material to exhibit both the binding properties of polyvinyl alcohol and the flexibility-enhancing characteristics of acrylamide groups, resolving the contradiction between hardness and flexibility.
2Stability of the object's composition
If high crystallinity resin is used, then the 3D object achieves structural stability, but it leads to low flexibility and susceptibility to breakage
Solution Approach 1:
By controlling the degree and position of acrylamide modification (terminal, side chain, or backbone), the patent adjusts the crystallinity parameter of the resin to an optimal range. This maintains sufficient structural stability for shape retention while reducing excessive crystallinity that causes brittleness and breakage.
3Strength
If the resin has high hardness, then the 3D object maintains shape integrity, but it reduces flexibility and causes breakage under stress
Solution Approach 1:
The patent introduces acrylamide groups to modify the resin's physical properties, changing the balance between hardness and flexibility. The modified resin maintains adequate shape integrity while gaining the flexibility needed to withstand bending stress during post-processing operations like sintering.
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 modified resin improves the flexibility and strength of 3D objects, allowing them to withstand bending stress without breaking and maintaining structural integrity during sintering processes.
Implementation Method 1
The use of diacetone acrylamide-modified polyvinyl alcohol with a specific functional group, which reduces crystallinity and increases hydrophilicity
Implementation Method 2
along with a cross-linking agent, to enhance the strength of 3D objects by forming cross-linking structures between resin molecules
Implementation Method 3
The modified resin improves the flexibility and strength of 3D objects, allowing them to withstand bending stress without breaking
Data Source
AI summary
A powder for 3D modeling includes a base particle and a resin having a functional group represented by the following Chemical formula 1,where A1 represents O or NH and R1, R2, and R3 each, independently represent CH3, C2H5, C3H7, or C4H9. The base particle is covered with the resin.