Polyarylene Sulfide Resin Powder Fluidity via Silica Spacing
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Solution Overview
Problem
Polyarylene sulfide resin powder/grain materials exhibit poor fluidity due to static electricity-induced aggregation and high compression degree, leading to handling issues during production and storage.
Innovation Solution
A polyarylene sulfide resin powder/grain composition is developed by blending inorganic spherical silica fine particles with average diameters between 20 nm and 500 nm into the resin powder, which is ground to achieve particle diameters between 1 µm and 100 µm, improving fluidity and reducing compression degree.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If inorganic fine particles are added to increase interparticle distance, then powder fluidity is improved, but compression degree increases in lower portions of silos or hoppers
Solution Approach 1:
The invention changes the particle size parameter of the inorganic fine particles to a specific range (0.1-5 μm) and controls the blending ratio (0.1-5 weight parts per 100 weight parts of resin powder). This parameter optimization resolves the contradiction by finding the sweet spot where particles are small enough to increase interparticle distance and improve fluidity, but not so small or numerous as to cause excessive compression in silos.
Solution Approach 2:
The invention creates a composite powder material by blending inorganic fine particles with polyarylene sulfide resin powder. This composite structure combines the fluidity-enhancing effect of inorganic particles with the structural integrity of the resin matrix, improving overall powder handling characteristics while controlling compression behavior.
2Area of stationary object
If particle diameter is reduced to improve surface area, then electrostatic aggregation increases, but fluidity deteriorates
Solution Approach 1:
The inorganic fine particles act as intermediary agents between the resin particles. They increase the interparticle distance as a mediating effect, reducing the direct electrostatic interaction between resin particles while still maintaining sufficient surface area for the application requirements.
Solution Approach 2:
The invention optimizes the particle size parameter of inorganic additives to 0.1-5 μm, which is small enough to effectively increase interparticle distance but controlled in quantity to avoid excessive compression that would counteract the fluidity improvement.
3Stability of the object's composition
If grinding is performed to reduce particle diameter, then uniformity degree increases, but electrostatic aggregation worsens
Solution Approach 1:
Inorganic fine particles serve as intermediary spacers between ground resin particles. Even though grinding increases uniformity degree, the inorganic particles maintain separation distances that prevent close-contact electrostatic aggregation, thus mitigating the harmful effect of fine particle uniformity.
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 resulting composition demonstrates enhanced powder fluidity and reduced compression, preventing clogging and improving handling characteristics during supply and discharge from silos.
Implementation Method 1
an inorganic fine particle is added to increase the interparticle distance and therefore reduce the interaction between particles
Implementation Method 2
the PAS resin powder/grain material, because of its high electrical insulation property, is apt to undergo aggregation due to static electricity
Implementation Method 3
a polyarylene sulfide resin powder/grain material which is obtained by grinding a polyarylene sulfide resin particle
Data Source
AI summary
The purpose of the present invention is to efficiently provide a polyarylene sulfide resin powder/grain composition having small average particle diameter, excellent powder fluidability and a low compression degree. A polyarylene sulfide resin powder/grain composition comprising: 100 parts by weight of a powdery or granular polyarylene sulfide resin having an average particle diameter of more than 1 µm and up to 100 µm and a uniformity degree of 4 or less; and 0.1 to 5 parts by weight of inorganic fine particles having an average particle diameter of 20 to 500 nm inclusive.