Pendent Pigment Polyamide for Uniform 3D Printing Color
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Solution Overview
Problem
In 3-D printing, achieving homogeneous incorporation of pigments in thermoplastic polymers like polyamides is challenging, leading to uneven coloring in final objects due to the particulate nature of pigments.
Innovation Solution
The method involves functionalizing metal oxide particles bound to pigment particles with compounds like epoxy or silica, creating surface-treated pigments that react with polyamides to form pigment-pendent polyamides (PP-polyamides), ensuring even pigment dispersion by attaching pigments to the polyamide backbone.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If particulate pigments are mixed into polyamide, then coloring is achieved, but homogeneous dispersion is difficult resulting in uneven color distribution
Solution Approach 1:
The patent combines the pigment particles with the polyamide polymer chains by forming covalent bonds between the pigment surface and polyamide functional groups. This merging of pigment and polymer into a single integrated structure eliminates the phase separation and aggregation problems inherent in physical mixing, achieving homogeneous color distribution at the molecular level.
Solution Approach 2:
The patent introduces surface treatment agents as intermediaries that modify the pigment particle surfaces to create compatible interaction sites with polyamide chains. These intermediaries facilitate the bonding between pigment and polymer by providing reactive functional groups that can form covalent linkages, enabling uniform dispersion without direct pigment-polymer contact issues.
2Ease of manufacture
If pigments are physically mixed in polyamide, then coloring is achieved, but pigments migrate over time causing color inconsistency
Solution Approach 1:
The patent performs preliminary chemical modification of pigment particles by coating them with polyamide chains during the manufacturing process. This preliminary attachment of polyamide to pigment surfaces creates stable anchor points that prevent subsequent migration, ensuring long-term color stability before the product is put into service.
Solution Approach 2:
The patent creates a composite material structure where pigment particles are chemically integrated with polyamide matrices through covalent bonding. This composite approach combines the coloring function of pigments with the structural properties of polyamide, forming a stable hybrid material where the pigment is permanently fixed and cannot migrate independently.
3Ease of manufacture
If conventional pigment mixing is used, then simple processing is maintained, but homogeneous incorporation is difficult
Solution Approach 1:
The patent changes the fundamental parameter of pigment-polymer interaction from physical mixing to chemical bonding. By transforming the nature of the interaction mechanism, the system achieves homogeneous incorporation without requiring complex multi-step processing, as the chemical bonding occurs during standard polymerization or compounding operations.
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 results in objects with consistent coloration over time, as the pigments are securely attached to the polyamide backbone, preventing migration and ensuring uniform color distribution.
Implementation Method 1
reacting the pendent epoxy with a polyamide to yield a pigment-pendent polyamide
Implementation Method 2
converting the pendent carboxylic acid to a pendent acid chloride; and reacting the pendent acid chloride with a polyamide
Implementation Method 3
functionalizing metal oxide particles that are bound to a pigment particle
Data Source
AI summary
A nonlimiting example method for synthesizing a pigment-pendent polyamide (PP-polyamide) may comprise: functionalizing metal oxide particles bound to a pigment particle with a compound having an epoxy to produce a surface treated pigment having a pendent epoxy; and reacting the pendent epoxy with a polyamide to yield the PP-polyamide. Another nonlimiting example method for synthesizing a PP-polyamide may comprise: functionalizing metal oxide particles bound to a pigment particle with a silica particle having a carboxylic acid surface treatment to produce a surface treated pigment having a pendent carboxylic acid; converting the pendent carboxylic acid to a pendent acid chloride; and reacting the pendent acid chloride with a polyamide to yield the PP-polyamide. Said PP-polyamide may be useful in producing objects by methods that include melt extrusion, injection molding, compression molding, melt spinning, melt emulsification, spray drying, cryogenic milling, freeze drying polymer dispersions, and precipitation of polymer dispersions.