Molding Material High Specific Gravity Thermal Conductivity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Molding materials with high specific gravity face limitations in thermal conductivity, leading to longer cycle times due to low thermal conductivity with iron oxide, and high thermal conductivity materials with metal fillers result in poor flow characteristics and tight process windows.
Innovation Solution
A molding material composition comprising 10-25 weight percent amorphous thermoplastic resin, 3-25 weight percent aluminum oxide or boron nitride, and 65-87 weight percent iron oxide, which improves thermal conductivity and allows for higher iron oxide content, using styrene acrylonitrile resin for reduced cycle times and enhanced dimensional stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of stationary object
If high density filler such as iron oxide is used to achieve high specific gravity, then the specific gravity is improved, but the thermal conductivity properties deteriorate leading to longer cycle times
Solution Approach 1:
The patent applies composite materials by combining iron oxide particles with thermoplastic resin and graphite flakes to create a molding material that achieves high specific gravity while maintaining adequate thermal conductivity through the synergistic effects of the composite structure
Solution Approach 2:
The patent changes parameters by controlling the particle size distribution of iron oxide (combining fine particles for density and coarse particles for structure), the aspect ratio of graphite flakes, and the temperature-history control during molding to achieve optimal balance between specific gravity and thermal conductivity
2Temperature
If metal based fillers with higher thermal conductivity are used, then the thermal conductivity is improved, but the flow characteristics deteriorate and process windows become smaller
Solution Approach 1:
The patent changes parameters by using graphite flakes with controlled aspect ratios and iron oxide particles with specific size distributions, along with controlling the temperature-history during molding, to achieve optimal balance between thermal conductivity and flow characteristics
Solution Approach 2:
The patent applies local quality by creating a multi-scale particle distribution where fine iron oxide particles fill gaps between coarser particles and graphite flakes, providing localized density enhancement while maintaining overall flow characteristics
3Weight of stationary object
If high percentage of iron oxide is used to increase specific gravity, then the specific gravity is improved, but the thermal conductivity deteriorates requiring longer cooling time
Solution Approach 1:
The patent applies composite materials by creating a tri-component system of iron oxide particles, thermoplastic resin, and graphite flakes that works synergistically to achieve high specific gravity while the graphite provides thermal conductivity pathways to reduce cooling time
Solution Approach 2:
The patent applies dimensionality change by using graphite flakes with high aspect ratios that create two-dimensional thermal conductivity pathways through the material, efficiently conducting heat away from molded parts without requiring high volumes that would compromise specific gravity
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 material achieves faster cooling times, improved flow characteristics, and increased iron oxide content, resulting in cost-effective, dimensionally stable products with attractive properties similar to metal products, while reducing manufacturing energy and resource usage.
Implementation Method 1
the thermal conductivity properties of the molding material are relatively poor
Implementation Method 2
molding materials having a relatively high specific gravity
Implementation Method 3
acrylonitrile butadiene styrene, polystyrene, and styrene acrylonitrile
Data Source
Figure 1~2
Figure 3
Figure 4
AI summary
A molding material having from about 10 weight percent to about 25 weight percent of an amorphous thermoplastic resin, from about 3 weight percent to about 25 weight percent of aluminum oxide, boron nitride or aluminum silicate and from about 65 weight percent to about 87 weight percent of iron oxide.