Heat Storage Capsule Coating for Solvent Resistance

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Solution Overview

Problem

The existing heat storage adsorbent materials face issues with phase change material leakage due to outer shell degradation from moisture or organic solvents, leading to reduced heat storing and adsorption/desorption performance, especially when exposed to aggressive fuels like ethanol-gasoline mixtures.

Innovation Solution

A method involving binding heat storage capsules with a molding binder, forming a granular molded material, and then coating with a binder to create a dense polymerization layer that prevents solvent and moisture intrusion, using a reaction promoting treatment to enhance the coating layer's density and mechanical strength.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If heat storage capsules are formed with a two-layered outer shell (inner hydrophobic layer and outer hydrophilic layer) to prevent permeation of evaporable fuel, then the adsorption/desorption performance is maintained, but the outer shell becomes vulnerable to destruction by moisture or water content leading to phase change material leakage

Engineering Contradiction:

Improveadsorption/desorption performanceVSAvoidmoisture degradation

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent applies different protective properties to different parts of the outer shell: the inner layer uses hydrophobic resin to resist evaporable fuel permeation, while the outer layer uses hydrophilic resin to resist moisture degradation. This local differentiation of material properties resolves the contradiction by addressing both harmful factors at their respective points of contact.

Inventive Principle:

Principle #3Local quality

2Strength

If heat storage capsules are molded together with a binder to form molded heat storage material, then the capsules are protected during mixing, but the binder creates gaps and voids that allow evaporable fuel to penetrate and destroy the outer shell

Engineering Contradiction:

Improvecapsule protection during mixingVSAvoidevaporable fuel penetration

Core Design Contradiction:

StrengthVSObject-affected harmful factors

Solution Approach 1:

The patent uses a coating layer formed by the coating binder to create a continuous protective film on the surface of the molded heat storage material. This thin film structure fills and seals the gaps and voids created by the molding process, preventing evaporable fuel penetration while maintaining the structural protection provided by the molding binder.

Inventive Principle:

Principle #30Flexible shells and thin films

3Reliability

If a coating layer is formed on the molded heat storage material to prevent solvent intrusion, then phase change material leakage is prevented, but the polymerization reaction of the coating binder must be promoted to ensure sufficient density and mechanical strength

Engineering Contradiction:

Improveleakage preventionVSAvoidcoating layer density

Core Design Contradiction:

ReliabilityVSManufacturing precision

Solution Approach 1:

The patent employs a reaction promoting treatment that changes the chemical parameters of the coating binder by promoting its polymerization reaction. This increases the cross-linking density and mechanical strength of the coating layer, ensuring sufficient density for leakage prevention while maintaining the protective function against solvent intrusion.

Inventive Principle:

Principle #35Parameter changes

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

This approach effectively prevents phase change material leakage and maintains high adsorption/desorption performance even in the presence of organic solvents and moisture, ensuring prolonged heat storage capacity and performance.

Implementation Method 1

subjecting the coated molded heat storage material having the coating layer to a reaction promoting treatment for promoting a polymerization reaction of at least the coating binder in the coating layer

Methodology Applied

Scientific EffectPolymerization reaction: Photopolymerisation

Implementation Method 2

heat storage capsules comprising a phase change material absorbing/discharging latent heat in accordance with change in temperature

Methodology Applied

Scientific EffectLatent heat absorption: Latent Heat

Data Source

PatentEP2280050B1Process for producing heat storage material, heat storage material, adsorbent material with heat storage function and canister

Publication Date: 2019.09.04 OSAKA GAS CHEM KK

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AI summary

[Summary] [Object] For a heat storage material containing heat storage capsule, to ensure favorable adsorption/desorption performance without reduction in heat storing performance even under a condition where an organic solvent (in particular, evaporable fuel of mixture of alcohol and gasoline) or a condition where moisture is present. [Solution] In a method of manufacturing a heat storage material containing heat storage capsules including a phase change material absorbing/discharging latent heat in accordance with change in temperature, the phase change material being charged in outer shells of the heat storage capsules, the method including the steps of binding a periphery of mutually contacting portions of a plurality of heat storage capsules with a molding binder, thereby to mold a granular molded heat storage material, coating an outer peripheral surface portion of the molded heat storage material with a coating binder to form a coating layer thereon and subjecting the coated molded heat storage material having the coating layer to a reaction promoting treatment for promoting a polymerization reaction of at least the coating binder in the coating layer.