Rubber Composition for Additive Manufacturing
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Solution Overview
Problem
Current additive manufacturing methods struggle to produce three-dimensional structures with high mechanical strength and excellent elongation using rubber, as rubber exhibits low temperature dependence and low compression set, differing from resin or metal structures.
Innovation Solution
A rubber composition comprising liquid rubber, an amine-based urethane acrylate oligomer, and a monomer, with a total content of the oligomer and monomer being 30 parts by mass or more per 100 parts of liquid rubber, is used for additive manufacturing, enabling the production of rubber shaped articles with high mechanical strength and elongation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If rubber composition is used for additive manufacturing, then rubber shaped articles with high mechanical strength and excellent elongation can be produced, but the composition requires specific ratios of amine-based urethane acrylate oligomer and monomer to achieve desired properties
Solution Approach 1:
The patent specifies precise parameter ranges for the rubber composition: amine-based urethane acrylate oligomer at 5-50 parts by mass and monomer at 25-70 parts by mass per 100 parts by mass of liquid rubber. By controlling these compositional parameters within defined ranges, the invention achieves both high mechanical strength (tensile strength ≥2.0 MPa) and excellent elongation (≥90%) while managing the complexity of the multi-component system.
Solution Approach 2:
The invention creates a composite rubber composition system combining liquid rubber with amine-based urethane acrylate oligomer and monomer. This composite approach allows the material to achieve superior mechanical properties (tensile strength ≥2.0 MPa, elongation ≥90%) that cannot be obtained with single-component systems, while the synergistic interaction between components resolves the complexity-strength trade-off.
2Adaptability or versatility
If rubber shaped articles are produced using additive manufacturing, then applications different from resin or metal structures can be enabled, but rubber exhibits low temperature dependence and low compression set compared to resins
Solution Approach 1:
The patent modifies the chemical composition parameters by incorporating amine-based urethane acrylate oligomer (5-50 parts by mass) and monomer (25-70 parts by mass) per 100 parts by mass of liquid rubber. This compositional adjustment enables the rubber to achieve improved temperature dependence and compression set resistance while maintaining the versatility for diverse applications including seals, gaskets, and flexible components.
Solution Approach 2:
The invention develops a composite rubber system combining liquid rubber with amine-based urethane acrylate oligomer and monomer. This composite structure allows the material to exhibit both the inherent versatility of rubber (low modulus, high elongation) and improved reliability in terms of temperature dependence and compression set, enabling broader application ranges.
3Strength
If the total content of amine-based urethane acrylate oligomer and monomer is 30 parts by mass or more per 100 parts by mass of liquid rubber, then rubber shaped articles achieve both high mechanical strength and excellent elongation, but the viscosity and processing parameters must be carefully controlled
Solution Approach 1:
The patent defines specific parameter ranges for ease of manufacturing: the rubber composition must have a viscosity of 1000 Pa·s or less at 35°C, and the total content of amine-based urethane acrylate oligomer and monomer should be 30-120 parts by mass per 100 parts by mass of liquid rubber. These parameter specifications enable both high mechanical strength (tensile strength ≥2.0 MPa, elongation ≥90%) and ease of processing through additive manufacturing.
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 rubber composition allows for the successful production of rubber shaped articles with high mechanical strength, excellent elongation, and specific properties such as Shore A hardness, tensile strength, and compression set, suitable for diverse applications.
Implementation Method 1
a photocurable resin is cured by laser beam irradiation
Data Source
Figure 1(a)~1(b)
Figure 2(a)~2(b)
AI summary
There is provided a rubber composition for additive manufacturing that allows a rubber shaped article to be favorably produced using an additive manufacturing apparatus, and allows the obtained rubber shaped article to achieve both high mechanical strength and excellent elongation. The rubber composition for additive manufacturing comprises a liquid rubber, an amine-based urethane acrylate oligomer, and a monomer, wherein a total content of the amine-based urethane acrylate oligomer and the monomer is 30 parts by mass or more, per 100 parts by mass of the liquid rubber.