Resin Composition Moisture Resistance Multilayer Structure
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Solution Overview
Problem
Multilayer structures with EVOH resin layers for gas-barrier performance are impaired by hot water treatments due to moisture absorption, leading to delamination issues caused by drying agents dissolving and transferring between layers, especially under high temperature and humidity conditions.
Innovation Solution
Incorporating a hydrate-forming alkaline earth metal salt with specific water absorption properties, such as completely dehydrated trimagnesium dicitrate, into a resin composition comprising polyamide-based or olefin-based resins, which provides moisture resistance without affecting the appearance of the multilayer structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a drying agent is added to EVOH resin to suppress deterioration of gas barrier performance by hot water treatment, then gas barrier performance is maintained, but the drying agent dissolves and transfers to the interface between layers, causing delamination
Solution Approach 1:
The patent extracts the harmful function of the drying agent (dissolution and transfer causing delamination) while retaining its useful function (maintaining gas barrier performance). This is achieved by replacing the conventional drying agent with a specific additive that provides the same moisture control function without the harmful side effects of dissolution and interfacial transfer.
Solution Approach 2:
The patent changes the chemical and physical parameters of the additive used in the EVOH resin layer. By selecting an additive with specific molecular weight, hydroxyl value, and chemical structure parameters, the solution achieves effective moisture control while preventing dissolution and delamination issues that occur with conventional drying agents.
2Reliability
If a multilayer film uses EVOH resin for gas barrier layer, then gas barrier performance is improved, but moisture resistance deteriorates under high humidity conditions
Solution Approach 1:
The patent introduces an intermediary substance (the specific additive with hydroxyl groups) into the EVOH resin layer that acts as a mediator between moisture and the resin matrix. This intermediary absorbs and binds moisture molecules, preventing them from disrupting the hydrogen bonding network in EVOH, thereby maintaining both gas barrier performance and moisture resistance simultaneously.
3Object-affected harmful factors
If polyamide-based resin or olefin-based resin is used as base resin, then moisture resistance is improved, but gas barrier performance may be insufficient
Solution Approach 1:
The patent creates a composite material system by combining EVOH resin (providing gas barrier performance) with polyamide-based or olefin-based resin (providing moisture resistance and mechanical strength). The specific additive serves as a compatibility modifier that ensures proper interfacial adhesion between the hydrophilic EVOH and hydrophobic base resin, achieving synergistic effects that satisfy both gas barrier and moisture resistance requirements.
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 resin composition effectively prevents performance deterioration due to moisture absorption, maintaining the integrity and gas-barrier performance of the multilayer structure even under high humidity and temperature conditions, thereby avoiding delamination and maintaining the structure's appearance.
Implementation Method 1
Incorporating a hydrate-forming alkaline earth metal salt with specific water absorption properties, such as completely dehydrated trimagnesium dicitrate, into a resin composition
Data Source
AI summary
A resin composition which can suppress the deterioration of performances of a multilayer structure due to moisture absorption regardless that the multilayer structure includes a hygroscopic layer whose performance is deteriorated due to moisture absorption, and a multilayer structure including a layer of the resin composition, are provided. Since the resin composition contains a hydrate-forming alkaline earth metal salt having a specific water absorption property, a multilayer structure comprising a layer of the resin composition can exhibit moisture resistance as a whole of the multilayer structure without affecting the appearance thereof.