Natural Wax Oxidate Emulsion for Heat-Free Barrier Coatings
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Solution Overview
Problem
Existing natural wax-based coatings for polysaccharide and biopolymer substrates require heat input for application, leading to energy inefficiency and poor adhesion, and lack effective water and water vapor barrier properties without using hazardous chemicals.
Innovation Solution
An aqueous natural wax oxidate emulsion containing natural wax oxidates with an acid number greater than or equal to 1, stabilized by anionic or non-ionic emulsifiers, allowing for heat-free application and forming a homogeneous, flexible, and impermeable barrier layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If natural wax-based coatings are applied from the melt requiring heat input, then the coating can form a barrier layer, but the process becomes energy-intensive
Solution Approach 1:
The patent changes the physical state parameter of the wax coating from melt (requiring heat input) to aqueous emulsion form (can be applied at lower temperatures). The wax oxidate is emulsified in water with surfactants, allowing the coating to be applied without melting, thus reducing energy consumption while still forming an effective barrier layer.
Solution Approach 2:
The patent introduces water as an intermediary medium to carry the wax oxidate. Instead of applying pure wax from the melt, the wax oxidate is dispersed in water forming an emulsion. This intermediary carrier allows the coating to be applied without heat input while maintaining barrier properties through the water-soluble wax oxidate system.
2Use of energy by moving object
If natural wax coatings are applied without heat input, then energy efficiency improves, but adhesion to substrate deteriorates
Solution Approach 1:
The patent changes the chemical parameters of the wax by using oxidized wax (wax oxidate) instead of pure wax. The oxidation process introduces carboxyl groups that can form hydrogen bonds and chemical bonds with cellulose substrates, significantly improving adhesion without requiring heat input for melting or bonding.
Solution Approach 2:
The patent creates a composite coating system combining wax oxidate with water and surfactants. This composite emulsion formulation allows the coating to be applied at low temperatures while the wax oxidate components provide both barrier properties and strong adhesion to the substrate through chemical interactions.
3Object-affected harmful factors
If natural wax coatings are used without hazardous chemicals, then health safety improves, but barrier properties deteriorate
Solution Approach 1:
The patent changes the oxidation state parameter of the wax to enhance barrier properties. By using oxidized wax (with acid number ≥1 mg KOH/g), the coating achieves improved water and water vapor barrier properties without requiring hazardous chemicals. The oxidation process creates polar groups that enhance barrier performance while maintaining the natural, non-hazardous composition.
Solution Approach 2:
The patent uses natural wax oxidate as an alternative to synthetic polymer coatings that would provide similar barrier properties. The wax oxidate system copies the barrier function of conventional polymers but maintains the advantages of natural materials - being non-hazardous, biodegradable, and free from harmful additives like MOSH/MOAH and phthalates.
4Object-affected harmful factors
If wax emulsion is used to increase water resistance, then water resistance improves, but the coating cannot form an effective barrier layer
Solution Approach 1:
The patent changes the form of the wax from conventional emulsion to oxidized wax emulsion. The wax oxidate with its modified chemical structure (acid number ≥1 mg KOH/g) enables the formation of a continuous, effective barrier layer while maintaining water resistance. The oxidation products provide both the barrier function and water resistance in a single integrated coating system.
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 emulsion provides a thin, energy-efficient, and flexible water vapor barrier layer with improved adhesion and reduced water absorption, suitable for polysaccharide and biopolymer substrates, including cellulose-based materials, without the need for heat and harmful additives.
Implementation Method 1
forming a water (vapor) barrier layer with improved barrier properties
Implementation Method 2
improved adhesion
Data Source
Figure 1~2
AI summary
The invention relates to an emulsion from the oxidation products of natural waxes, having improved barrier properties, to a process of producing such an emulsion, and to cellulose fiber articles or biopolymers coated with such an emulsion from the oxidation products of natural waxes. The invention further relates to the use of such an emulsion for coating substrates that contain cellulose fibers or biopolymers.