Resin Bonded Sorbent for Moisture Control and EMI Shielding
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Solution Overview
Problem
Existing resin/sorbent matrices in molding compositions are brittle, prone to moisture absorption, and costly, with limitations in mechanical properties and compatibility, making them unsuitable for harsh environmental conditions such as those encountered in lamp assemblies used in automotive and marine industries.
Innovation Solution
A multifunctional resin bonded sorbent material is developed, incorporating sorbent particles uniformly dispersed in a resin with electrically conductive additives, enhancing mechanical properties and moisture barrier capabilities while allowing for higher sorbent loading without the need for reinforcing additives like glass fibers, and providing EMI shielding and electrical conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If reinforcing additives like glass fibers are added to enhance mechanical properties, then strength and hardness are improved, but the loading factor of sorbent additives is limited and mechanical brittleness increases
Solution Approach 1:
The patent uses a composite material system combining polymer resin with sorbent particles (molecular sieves, silica gel, activated alumina) to create a multifunctional material that simultaneously provides mechanical support and moisture adsorption. This eliminates the need for separate glass fiber reinforcement while maintaining structural integrity and enabling high sorbent loading (30-70 wt%).
Solution Approach 2:
The sorbent particles serve multiple functions: they act as both the moisture-adsorbing functional component and the structural reinforcing phase. This multi-functionality allows the material to achieve both high sorbent loading and adequate mechanical properties without requiring additional reinforcing additives like glass fibers.
2Quantity of substance
If sorbent loading is increased to improve moisture adsorption capacity, then adsorption performance is enhanced, but mechanical properties such as hardness and tensile strength are reduced
Solution Approach 1:
The patent optimizes the particle size of sorbent materials (0.1-2.0 mm) and controls the polymer-to-sorbent ratio (30-70 wt% sorbent) to achieve a balance between adsorption capacity and mechanical properties. The specific surface area and pore structure of the sorbent particles are also controlled to maintain structural integrity at high loading levels.
Solution Approach 2:
The use of porous sorbent materials with controlled pore structures (0.3-1.0 micrometer pores) provides both high adsorption capacity and structural framework that maintains mechanical strength. The porous structure allows high surface area for adsorption while the interlocking particle network provides mechanical support.
3Quantity of substance
If conventional resin/sorbent matrices are used, then moisture adsorption is achieved, but the materials are brittle and insufficient to survive standard drop testing
Solution Approach 1:
The patent employs a polymer resin matrix (polyethylene, polypropylene, or polyester) that provides flexibility and impact resistance to the sorbent particle composite. The polymer binds the rigid sorbent particles into a cohesive structure that can withstand mechanical shock and drop testing, eliminating the brittleness of conventional sorbent matrices.
4Quantity of substance
If existing resin/sorbent matrices are used, then sorbent functionality is achieved, but manufacturing costs are high due to exotic resin, additional processing steps, and multi-resin materials
Solution Approach 1:
The patent replaces expensive exotic resins with common, low-cost polymers such as polyethylene, polypropylene, or polyester. These commodity plastics can be processed using standard injection molding equipment and procedures, eliminating the need for specialized processing steps and reducing manufacturing costs while maintaining sorbent functionality.
Solution Approach 2:
The patent combines the sorbent particles directly into a single polymer matrix, eliminating the need for multi-resin systems with phase boundaries. This simplification reduces manufacturing complexity, eliminates additional processing steps, and lowers material costs while achieving the same moisture adsorption performance.
5Quantity of substance
If existing resin/sorbent matrices are used, then sorbent adsorption is achieved, but water is adsorbed or absorbed at a faster rate which may be too fast for common manufacturing procedures
Solution Approach 1:
The patent uses sorbent particles with controlled pore sizes (0.3-1.0 micrometer) that provide a balanced adsorption rate. The pore structure allows sufficient moisture uptake capacity while the polymer matrix moderates the adsorption kinetics, preventing excessively rapid water absorption that would interfere with manufacturing cycles and assembly processes.
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 solution results in a cost-effective, durable, and moisture-resistant material that prevents moisture ingress, maintains mechanical integrity, and offers EMI shielding and electrical conductivity, suitable for harsh environments without the need for expensive and labor-intensive sealing methods.
Implementation Method 1
sorbent particles uniformly dispersed within the resin so that each sorbent particle is fully surrounded by the resin
Implementation Method 2
electrically conductive material includes a plurality of conductive particles dispersed within the resin so that the plurality of conductive particles forms a conductive path
Data Source
AI summary
A multi-functional resin bonded sorbent material including a blend of a resin, a sorbent and an electrically conductive material. The sorbent includes a plurality of sorbent particles uniformly dispersed within the resin so that each sorbent particle of the plurality of sorbent particles is fully surrounded by the resin and the electrically conductive material includes a plurality of conductive particles dispersed within the resin so that the plurality of conductive particles forms a conductive path.