Siliceous Paper Coating for Water, Oil, and Oxygen Barrier
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Solution Overview
Problem
Existing methods for making paper and cardboard impermeable to liquids and gases are inefficient, require long drying times, and do not lend themselves to industrial scale application, while using plastics for packaging poses significant environmental pollution issues.
Innovation Solution
A treatment process involving an aqueous solution of micrometric silica, hydrolyzed tetraalkoxysilane, and hydrolyzed alkyl-trialkoxysilane, optionally with additives like alcohol and base, followed by a thermal treatment at 100-250°C, creates a nanometer-thick siliceous layer on paper or cardboard surfaces, rendering them impermeable to liquids and gases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If plastic materials are used for packaging to achieve impermeability to liquids and gases, then impermeability performance is improved, but environmental pollution increases
Solution Approach 1:
The patent changes the chemical composition parameters by using natural materials (wax, resins, oils, cellulose derivatives) instead of conventional plastics, and controls the molecular weight and composition ratios to achieve both impermeability and biodegradability. The treatment solution contains specific concentrations of these natural materials that form an impermeable barrier while maintaining environmental compatibility.
Solution Approach 2:
The patent enables the packaging material to be discarded without causing environmental harm by using biodegradable natural materials. The treated paper or cardboard can be recycled or composted, allowing the material to break down naturally after use, thus recovering environmental resources rather than creating persistent pollution.
2Object-generated harmful factors
If paper or cardboard is treated to achieve impermeability, then environmental compatibility is improved, but drying time increases
Solution Approach 1:
The patent optimizes the solvent composition and concentration parameters in the treatment solution to control drying time. By adjusting the ratio of water to organic solvents and the concentration of active ingredients, the formulation achieves rapid drying while maintaining environmental compatibility through the use of natural, biodegradable materials.
Solution Approach 2:
The patent applies preliminary surface activation or preparation steps before applying the impermeable coating, which enhances the absorption and drying characteristics of the treatment solution. This preliminary action ensures rapid penetration and drying of the natural materials into the paper or cardboard matrix, reducing overall processing time.
3Reliability
If a siliceous layer is deposited on paper or cardboard surface, then impermeability to liquids and gases is improved, but manufacturing complexity increases
Solution Approach 1:
The patent merges multiple functions into a single treatment solution that simultaneously provides impermeability to liquids and gases, water repellency, and ease of application. The composition combines wax, resins, oils, and cellulose derivatives in specific ratios to achieve comprehensive protection in one coating step, eliminating the need for separate treatments for different protective functions.
Solution Approach 2:
The patent simplifies the manufacturing process by controlling the molecular weight and composition parameters of the natural materials used. By selecting materials with appropriate molecular characteristics and optimizing their concentration ratios, the treatment solution achieves effective impermeability while maintaining simple formulation and application procedures suitable for industrial production.
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 treated paper and cardboard exhibit hydrophobic and oleophobic properties, effectively preventing liquid absorption and gas permeation, with performance comparable to plastics, and are recyclable, addressing environmental concerns.
Implementation Method 1
a.1) between 35% and 100% by weight of an aqueous solution containing between 5% and 20% by weight of micrometric silica, between 15% and 40% by weight of a hydrolyzed tetraalkoxysilane, and between 25% and 40% by weight of a hydrolyzed alkyl-trialkoxysilane
Implementation Method 2
The treatment process involving an aqueous solution of micrometric silica, hydrolyzed tetraalkoxysilane, and hydrolyzed alkyl-trialkoxysilane, optionally with additives like alcohol and base, followed by a thermal treatment at 100-250°C, creates a nanometer-thick siliceous layer on paper or cardboard surfaces
Implementation Method 3
followed by a thermal treatment at 100-250°C, creates a nanometer-thick siliceous layer on paper or cardboard surfaces
Implementation Method 4
The treated paper and cardboard exhibit hydrophobic and oleophobic properties, effectively preventing liquid absorption and gas permeation
Implementation Method 5
The treated paper and cardboard exhibit hydrophobic and oleophobic properties, effectively preventing liquid absorption and gas permeation
Data Source
AI summary
A process for the treatment of paper or cardboard surface is described that makes them impermeable to water, oil, and atmospheric gases, in particular oxygen. The invention also relates to the impermeable paper or cardboard thus obtained, which are particularly suitable for producing food product packaging or tableware.