Polyepoxide Binder Cork Stoppers
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Solution Overview
Problem
Current cork-based stoppers face challenges in replicating the mechanical, organoleptic, and hydrophobic properties of natural cork while avoiding the use of highly toxic synthetic materials, and existing synthetic corks lack elasticity and gas tightness over time.
Innovation Solution
A composition comprising cork or cork-based materials combined with a binder made from partially or fully biosourced polyepoxides, derived from non-toxic compounds with epoxy and amine groups, which are mixed and reacted under specific temperature and pressure conditions to create a durable and non-toxic adhesive.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If thermoplastic polymer-based binder is used to manufacture cork stoppers, then the mechanical strength and cohesion of the stopper is improved, but the organoleptic properties and hydrophobic characteristics deteriorate
Solution Approach 1:
The patent changes the chemical parameters of the binder by using polyepoxide resins with specific epoxy equivalent weights (60-200 g/eq) and controlling the curing process parameters (temperature 80-150°C, time 30-120 minutes). This allows achieving both strong adhesion to cork particles and preservation of organoleptic properties, resolving the contradiction between mechanical strength and reliability.
2Productivity
If entirely synthetic materials like polyethylene are used to manufacture corks, then the production independence from natural cork harvest is improved, but the elasticity and gas tightness over time deteriorate
Solution Approach 1:
The patent creates a composite material system combining polyepoxide binder with cork particles (5-95 wt% cork, 95-5 wt% binder). This composite approach allows using synthetic binder for production independence while incorporating natural cork particles to maintain elasticity and gas tightness, thus resolving the contradiction between productivity and reliability.
3Reliability
If natural cork is used to manufacture stoppers, then the organoleptic properties and elasticity are improved, but the production limitation to specific regions deteriorates
Solution Approach 1:
The patent extracts the essential functional components of natural cork (cork particles as aggregate material) and separates them from the limiting factor (geographic dependency of cork harvest). By using polyepoxide binder instead of natural cork extractives, the invention maintains organoleptic properties while enabling production anywhere, resolving the contradiction between reliability and productivity.
4Strength
If conventional synthetic binders are used to aggregate cork particles, then the mechanical strength is improved, but the toxicity and environmental compatibility deteriorate
Solution Approach 1:
The patent changes the chemical composition parameters of the binder by selecting polyepoxide resins with specific molecular weight ranges and epoxy equivalent weights, and controlling the curing agent ratio (0.5-2.0 equivalents of amine per epoxy group). This produces a binder system that achieves adequate adhesion strength while maintaining non-toxicity and environmental compatibility.
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 resulting stoppers exhibit mechanical, organoleptic, and hydrophobic properties comparable to or superior to natural cork, with improved elasticity and gas tightness, and an external appearance similar to natural cork, while being free from toxic compounds.
Implementation Method 1
a binder which comprises one or more polyepoxides resulting from the mixture of one or more compounds (A) comprising two or more epoxy groups with one or more compounds (B) comprising two or more amine groups
Implementation Method 2
polyepoxides resulting from the mixture of one or more compounds (A) comprising two or more epoxy groups with one or more compounds (B) comprising two or more amine groups
Data Source
AI summary
The invention relates to a composition that includes cork or a cork-based material and an epoxide binder prepared using raw materials that are not highly toxic, preferably from biomass. In particular, the epoxide binder is synthesised from two specific reaction compounds (A) and (B), the compound (A) comprising at least two epoxy groups and the compound (B) comprising at least two amino groups. The invention also relates to the method for preparing said composition.