Biobased Polyamide Composition for High-Temperature 3D Printing
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Solution Overview
Problem
Existing polyamides used in additive manufacturing, such as PA11 and PA12, have limited thermal stability due to low melting points, while PA6 offers good thermal stability but high hydrophilicity, and there is a growing demand for materials with hydrophobic features and thermal stability exceeding 200°C, along with a need for bio-based materials.
Innovation Solution
A polyamide composition comprising at least 50% by weight of polyamide with at least 90% recurring units of formula —NH—(CH2)8—C(O)— or —NH—(CH2)9—C(O)—, optionally reinforced with up to 50% reinforcing agents and up to 30% additives, is used in a Fused Filament Fabrication (FFF) method for 3D printing, ensuring high thermal stability and hydrophobicity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If polyamide 11 or polyamide 12 is used for additive manufacturing, then good hydrophobicity and mechanical properties are achieved, but thermal stability is limited due to low melting points
Solution Approach 1:
The patent changes the chemical structure parameter of the polyamide by specifying recurring units with formula —NH—(CH2)8—C(O)— or —NH—(CH2)9—C(O)—, which have longer hydrocarbon chains than conventional PAs. This structural parameter change directly increases the melting point from ~180-190°C to above 200°C, thereby improving thermal stability while preserving the hydrophobic character of the material.
Solution Approach 2:
The patent creates a composite polyamide composition by combining the bio-based polyamide with specific additives including lubricants, colorants, and stabilizers. This composite approach allows the base polyamide to provide thermal stability and hydrophobicity while additives compensate for potential weaknesses in processability or mechanical properties, achieving a balanced performance profile.
2Temperature
If polyamide 6 is used for additive manufacturing, then good thermal stability is achieved, but hydrophilicity increases
Solution Approach 1:
The patent modifies the hydrocarbon chain length parameter by specifying —(CH2)8— or —(CH2)9— segments, which are significantly longer than the —(CH2)5— in PA6. This parameter change increases the hydrophobic character of the polyamide backbone while simultaneously raising the melting point above 200°C, thus resolving the contradiction between thermal stability and hydrophilicity.
3Reliability
If bio-based polyamides are used to meet sustainability requirements, then environmental compatibility is improved, but thermal stability may be compromised
Solution Approach 1:
The patent specifies precise chemical structure parameters for the bio-based polyamide, requiring at least 90 mol% of recurring units with formula —NH—(CH2)8—C(O)— or —NH—(CH2)9—C(O)—. This structural specification ensures that regardless of the bio-based feedstock source, the resulting material achieves melting points above 200°C, thus decoupling thermal stability from material origin and enabling sustainable sourcing without compromising performance.
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 method produces 3D objects with enhanced thermal stability and hydrophobicity, suitable for applications requiring high melting points and bio-based materials, while maintaining mechanical properties and dimensional stability.
Implementation Method 1
The part material is extruded through an extrusion tip carried by a print head of the system and is deposited as a consequence of roads on a plate in an x-y plane. The extruded part material fuses to previously deposited part material and solidifies upon a drop in temperature.
Implementation Method 2
The extruded part material fuses to previously deposited part material and solidifies upon a drop in temperature.
Data Source
AI summary
Described herein is an additive manufacturing method of making a three-dimensional (3D) object with a polyamide composition comprising at least 50% by weight (wt %) of a polyamide comprising at least 50% by mol (mol %) recurring units of —NH—(CH2)8—C(O)— and/or —NH—(CH2)9—C(O)—; from 0 wt % to 50 wt % of at least one reinforcing agent and from 0 wt % to 30 wt % of at least one additive, with excellent thermal stability. The present invention also relates to an article or composite material manufactured by the additive manufacturing method.