Hydrotalcite-Intercalated Polymer for Controlled Active Release
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Solution Overview
Problem
Current polymer compositions for food packaging do not effectively extend the shelf life of food products by providing sustained antimicrobial and antioxidant protection, as they lack efficient methods for releasing active molecules that interact positively with food products.
Innovation Solution
A polymer composition is developed by intercalating hydrotalcites with active molecules through a single-step co-precipitation process, where metals M(II) and M(III) salts react with an active anion in the presence of an alkaline solution, resulting in a hydrotalcite with specific PXRD patterns and low water content, which is then dispersed in a polymer matrix to enhance the release and retention of antimicrobial, antioxidant, and antimycotic agents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If active molecules are added to polymer compositions for food packaging, then the shelf life of food products is extended through antimicrobial and antioxidant protection, but the polymer composition lacks efficient controlled release mechanisms resulting in ineffective sustained protection
Solution Approach 1:
The patent utilizes hydrotalcite, a layered double hydroxide with an intercalated structure that creates controlled porosity. The layered structure allows active molecules to be hosted between the layers and released in a controlled manner, providing both immediate and sustained release mechanisms that extend food shelf life while maintaining reliable protection.
Solution Approach 2:
The patent creates a composite material by incorporating hydrotalcite into the polymer matrix. This composite structure combines the protective properties of the polymer with the controlled release capabilities of hydrotalcite, enabling sustained antimicrobial and antioxidant protection that extends food shelf life effectively.
2Ease of manufacture
If conventional packaging materials are used, then the packaging is simple and easy to process, but it cannot perform active functions such as removing unwanted substances or providing antimicrobial and antioxidant protection
Solution Approach 1:
The patent makes the polymer packaging material multi-functional by incorporating hydrotalcite that can host various active molecules with antimicrobial, antioxidant, and antimycotic properties. The same base polymer-hydrotalcite composite can be adapted to provide different active functions depending on which molecules are intercalated, while maintaining ease of processing through conventional extrusion and molding techniques.
3Speed
If active molecules are released immediately upon contact with food, then rapid protection is achieved, but sustained release over time is insufficient to maintain protection throughout the shelf life period
Solution Approach 1:
The hydrotalcite structure enables periodic release of active molecules through its layered intercalated structure. The release occurs in phases - initial rapid release for immediate protection followed by sustained gradual release from the layered structure, maintaining protective levels throughout the food shelf life period.
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 composition provides a controlled release of active molecules, enhancing the shelf life of food products by maintaining protection through a combination of immediate and sustained release, improving mechanical and thermal properties of the packaging material, and increasing barrier effects against gases, liquids, and vapors.
Implementation Method 1
Synthetic hydrotalcite is a layered solid substantially formed by positively charged layers whose charge is balanced by exchangeable anions located in the interlayer region. The anion can be an active molecule that is stored and preserved, and which in some cases can be subsequently released into the environment to interact positively therewith.
Implementation Method 2
The hydrotalcite intercalated with active molecules is prepared in a single step by means of reaction in aqueous solution of salts of the metals M(II) and M(III) with a solution containing the anion of the active ingredient, through the addition of a solution of an alkaline hydroxide.
Data Source
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AI summary
There is described a process for preparing a polymer composition comprising hydrotalcites intercalated withactive molecules prepared by co-precipitation in a single reaction step. The co-precipitated hydrotalcite is dispersed into the bulk polymer trough the conventional incorporation methods. The polymer composition is suitable for use in the production of articles of manufacture such as films, rigid or semi-rigid containers and the like, in particular functional active packagings capable of increasing the shelf life of food products. Another process described here is the incorporation of the co-precipitated hydrotalcite into an adhesive polymer precursor to be coated on films, rigid or semi rigid containers. The obtained objects contain the active hydrotalcite only on the surfaceand nevertheless are capable of increasing the shelf life of food products.